CN113890178A - Novel multi-source power supply system and method for vaccination vehicle - Google Patents
Novel multi-source power supply system and method for vaccination vehicle Download PDFInfo
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- CN113890178A CN113890178A CN202111293832.3A CN202111293832A CN113890178A CN 113890178 A CN113890178 A CN 113890178A CN 202111293832 A CN202111293832 A CN 202111293832A CN 113890178 A CN113890178 A CN 113890178A
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- 238000002255 vaccination Methods 0.000 title claims abstract description 43
- 238000000034 method Methods 0.000 title claims abstract description 19
- 230000000087 stabilizing effect Effects 0.000 claims abstract description 17
- 230000002457 bidirectional effect Effects 0.000 claims description 59
- 238000001514 detection method Methods 0.000 claims description 25
- 238000012544 monitoring process Methods 0.000 claims description 16
- 238000004891 communication Methods 0.000 claims description 12
- 238000012545 processing Methods 0.000 claims description 11
- 238000012423 maintenance Methods 0.000 claims description 10
- 238000001914 filtration Methods 0.000 claims description 6
- 230000006641 stabilisation Effects 0.000 claims description 6
- 238000011105 stabilization Methods 0.000 claims description 6
- 230000011664 signaling Effects 0.000 claims description 5
- 230000009471 action Effects 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 4
- 229960005486 vaccine Drugs 0.000 description 3
- 238000011081 inoculation Methods 0.000 description 2
- 230000007774 longterm Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 229910001416 lithium ion Inorganic materials 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
- H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
- H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
- H02J9/068—Electronic means for switching from one power supply to another power supply, e.g. to avoid parallel connection
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
- H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
- H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
- H02J9/062—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems for AC powered loads
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- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The invention relates to a novel multi-source power supply system and a method for a vaccination vehicle, wherein the system comprises: the device comprises a power supply module, a control module, a voltage-stabilizing filter circuit and a contactor; the power module comprises commercial power, a power battery pack and a storage battery; the contactor comprises a first contactor, a second contactor and a third contactor; the mains supply, the first contactor, the voltage stabilizing filter circuit, the third contactor and the load equipment are connected in sequence; the power battery pack, the second contactor and the third contactor are connected in sequence; the storage battery is connected with the third contactor; the control module is respectively connected with the first contactor, the second contactor and the third contactor; the control module is also respectively connected with the output end of the commercial power, the output end of the voltage-stabilizing filter circuit and the load. The invention improves the power supply stability and power supply efficiency of the mobile vaccination vehicle.
Description
Technical Field
The invention relates to the field of power supply systems, in particular to a novel multi-source power supply system and method for a vaccination vehicle.
Background
Vaccination is accelerating due to outbreaks of epidemic situations and marketing of vaccines in various countries. In order to strengthen the inoculation service capacity and ensure timely inoculation of the people meeting the conditions, the mobile vaccination vehicle is arranged in a region with large people flow or a rural area, so that long-acting power supply or emergency power supply is required for vehicle-mounted vaccine refrigerators, computers and the like, and the continuous stability and safety of a vaccine storage and monitoring system are ensured. The existing mobile vaccination vehicle is powered by mains supply, the power supply type is single, the electric quantity of a standby power supply is too small to stably supply power, a long-acting power supply is in an idle running state for a long time, and the power supply efficiency is low.
Disclosure of Invention
The invention aims to provide a novel multi-source power supply system and method for a vaccination vehicle, and aims to solve the problems of unstable power supply and low efficiency of the existing mobile vaccination vehicle.
In order to achieve the purpose, the invention provides the following scheme:
a novel vaccination vehicle multi-source power supply system, comprising: the device comprises a power supply module, a control module, a voltage-stabilizing filter circuit and a contactor; the power module comprises commercial power, a power battery pack and a storage battery; the contactor comprises a first contactor, a second contactor and a third contactor;
the mains supply, the first contactor, the voltage stabilizing filter circuit, the third contactor and the load equipment are connected in sequence; the commercial power is used as a main power supply to supply power to load equipment; the voltage stabilizing and filtering circuit is used for performing voltage stabilizing and filtering on the voltage output by the commercial power;
the power battery pack, the second contactor and the third contactor are connected in sequence; the power battery pack is used as an auxiliary power supply to supply power to load equipment;
the storage battery is connected with the third contactor; the storage battery is used as a standby power supply to supply power to load equipment and is also used for storing redundant electric energy generated by the power battery pack and redundant electric energy generated by the commercial power;
the control module is respectively connected with the first contactor, the second contactor and the third contactor; the control module is also respectively connected with the output end of the commercial power, the output end of the voltage-stabilizing filter circuit and the load; the control module is used for detecting a first voltage signal at the output end of the mains supply and a third voltage signal at the output end of the voltage-stabilizing filter circuit, and controlling the on-off of the first contactor according to the first voltage signal; and controlling the on-off of the third contactor according to the third voltage signal, and controlling the on-off of the second contactor according to the current flowing into the load equipment.
Optionally, a current detector is further included; the current detector is respectively connected with the third contactor and the load equipment;
the current detector is configured to detect a current flowing into the load device.
Optionally, the control module includes: a detection unit and a control unit; the detection unit is connected with the control unit;
the detection unit is respectively connected with the current detector, the output end of the commercial power and the output end of the voltage-stabilizing filter circuit; the detection unit is used for processing the first voltage signal to generate a first control signal, processing the third voltage signal to generate a third control signal, and processing the current signal to generate a second control signal;
the control unit is respectively connected with the first contactor, the second contactor and the third contactor; the control unit is used for controlling the first contactor to be closed according to the first control signal and controlling the third contactor to be closed according to the third control signal; the control unit is used for controlling the first contactor or the second contactor to be disconnected according to the second control signal.
Optionally, the power module further includes: a bypass input circuit and a manual service switch;
the bypass input circuit is connected with the current detector through the manual maintenance switch; the bypass input circuit is used for supplying power to the load equipment through the bypass input circuit when the multi-source power supply system of the novel vaccination vehicle is maintained or the storage battery is replaced and the load equipment cannot interrupt power supply; the manual maintenance switch is used for manually switching the bypass input circuit.
Optionally, the control module is further configured to detect a voltage of each branch, and is configured to determine whether the electric device of each branch is working normally.
Optionally, the system further comprises a bidirectional inverter and an inverter;
the input end of the bidirectional inverter is connected with the storage battery, and the output end of the bidirectional inverter is respectively connected with the third contactor and the inverter; the output end of the inverter is also connected with the third contactor;
the inverter is used for inverting the direct-current voltage of the power battery pack into the alternating-current voltage required by the load equipment;
the bidirectional inverter is used for detecting whether the load equipment is connected with a power supply or not and is also used for inverting the direct-current voltage of the storage battery into alternating-current voltage required by the load equipment.
Optionally, the system further comprises an intelligent monitoring and communication circuit; the control module is connected with a computer through the intelligent monitoring and communication circuit;
and monitoring software in the computer monitors the running conditions of the multi-source power supply system and the power supply circuit of the novel vaccination vehicle through a communication circuit, and records and prompts the power failure condition.
A novel multi-source power supply method for a vaccination vehicle comprises the following steps:
when the load equipment needs to work, the commercial power is connected to supply power to the load equipment;
judging whether the load equipment starts to work or not, and if the load equipment does not start to work, judging whether the commercial power is connected or suddenly cut off or the circuit fails to work to obtain a first judgment result; if the load equipment starts to work, acquiring a first current value flowing into the load equipment;
if the first judgment result is that the commercial power is not connected or suddenly cut off or the circuit fails, closing the second contactor, and judging whether the bidirectional inverter detects the power input to obtain a second judgment result; if the first judgment result is that the mains supply is connected or not powered off or the circuit is not in fault, no action is taken;
if the second judgment result is that the bidirectional inverter detects the power supply input, acquiring a second current value flowing into the load equipment; if the second judgment result is that the bidirectional inverter does not detect the power supply input, the bidirectional inverter enters an inversion mode, and the storage battery supplies power to the load equipment;
judging whether the first current value or the second current value is larger than a minimum set value or not to obtain a third judgment result;
when the third judgment result is that the first current value or the second current value is larger than the minimum set value, determining that the loaded equipment works; when the third judgment result is that the first current value or the second current value is smaller than or equal to a minimum set value, determining that no-load equipment works, disconnecting the first contactor or the second contactor, and enabling the bidirectional inverter to be in a standby state;
sending a wake-up signal to the bidirectional inverter at a set time interval to enable the bidirectional inverter to be in an inversion state, and supplying power to load equipment through a storage battery;
acquiring a third current value flowing into the load equipment, and judging whether the third current value is greater than a minimum current set value or not to obtain a fourth judgment result;
if the fourth judgment result is that the third current value is larger than the minimum current setting value, determining that the load equipment needs to work, and closing the first contactor, wherein the load equipment is switched into the mains supply by the power supply of the storage battery or the second contactor is closed, and the load equipment is switched into the power battery pack by the power supply of the storage battery; and if the fourth judgment result is that the third current value is smaller than or equal to the minimum current set value, determining that no load equipment needs to work.
Optionally, when the load device needs to work, the load device is powered by the mains supply, and the method specifically includes:
judging whether the voltage of the commercial power input end is larger than a set voltage value or not to obtain a fifth judgment result;
if the fifth judgment result is that the first voltage signal is greater than the first set voltage value, closing the first contactor; if the fifth judgment result is that the first voltage signal is less than or equal to the first set voltage value, returning to the step of judging whether the voltage of the commercial power input end is greater than the set voltage value to obtain a fifth judgment result;
judging whether a third voltage signal at the output end of the voltage stabilizing filter circuit is equal to a second set voltage value or not to obtain a sixth judgment result;
if the sixth judgment result is that the third voltage signal is equal to the second set voltage value, closing the third contactor; and if the sixth judgment result is that the third voltage signal is greater than or less than the second set voltage value, determining that the voltage stabilization fails or the circuit fails.
Optionally, when the bidirectional inverter detects that the commercial power or the power of the power battery pack is input, it is determined whether a third current value flowing into the load device is greater than a maximum current setting value;
if the third current value is larger than the maximum current set value, the commercial power or the power supply of the power battery pack does not charge the storage battery; and if the third current value is less than or equal to the maximum current set value, the commercial power or the power supply of the power battery pack supplies power to the load equipment and charges the storage battery.
According to the specific embodiment provided by the invention, the invention discloses the following technical effects:
the invention supplies power to the load equipment through the commercial power, the power battery pack and the storage battery, the main power supply source is the commercial power, and the commercial power is output to the load equipment through the voltage stabilizing filter circuit. The second power supply source is provided by the power battery pack, when the bidirectional inverter detects that no commercial power is input or the voltage of the storage battery is lower than the set voltage, the bidirectional inverter sends a power supply request to the control module, the control module receives the request to control the second contactor to be closed, and the power battery pack can supply power to the load equipment and charge the storage battery simultaneously after the second contactor is closed, so that the storage battery is guaranteed not to be powered off. When the bidirectional inverter does not detect the input of the commercial power or the power supply of the power battery pack, the storage battery supplies power to the load equipment, so that the power supply stability and the power supply efficiency of the mobile vaccination vehicle are improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive exercise.
FIG. 1 is a schematic diagram of a multi-source power supply system of a novel vaccination vehicle provided by the invention;
FIG. 2 is a schematic diagram of a multi-source power supply system of a novel vaccination vehicle provided by the invention;
fig. 3 is a flow chart of a multi-source power supply method of the novel vaccination vehicle provided by the invention.
Description of the symbols: 1-commercial power; 2-a power battery pack; 3-a storage battery; 4-bypass input circuit; 5-a control module; 6-a voltage stabilizing filter circuit; 7-a bidirectional inverter; 8-an inverter; 9-a current detector; 10-a load device; 11-a computer; 12-an integrated circuit; PDU-power distribution unit; k1 — first contactor; k2 — second contactor; k3-third contactor; K4-Manual service switch; v1 — voltage at first contactor input; v2 — first contactor output terminal voltage; v3 — third contactor input terminal voltage; v4 — load device input voltage; v5 — voltage at second contactor input; v6 — second contactor output terminal voltage; v7-branch voltage of the storage battery; a first contactor input terminal voltage; v2 — first contactor output terminal voltage; v8 — the voltage at which the input branch is bypassed.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention aims to provide a novel multi-source power supply system and method for a vaccination vehicle, and aims to solve the problems of unstable power supply and low efficiency of the existing mobile vaccination vehicle.
The invention provides a novel multi-source power supply control system of a vaccination vehicle, which uses commercial power as a main power supply, a power battery as an auxiliary power supply and a storage battery as a standby power supply, so that long-term power supply of vehicle-mounted equipment is ensured and real-time intelligent monitoring can be realized.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
Fig. 1 is a schematic diagram of a multi-source power supply system of a novel vaccination vehicle provided by the present invention, as shown in fig. 1, the system includes: the power supply module, the control module 5, the voltage-stabilizing filter circuit 6 and the contactor; the power supply module comprises a mains supply 1, a power battery pack 2 and a storage battery 3; the contactor includes a first contactor K1, a second contactor K2, and a third contactor K3. The on-off of the contactor is controlled by the control module 5 according to the power-on logic, the on-off of the branch circuits and the automatic switching from one circuit to the other circuit are realized, and the on-off detection is carried out, so that whether the contactor is effectively turned on or off can be judged.
The commercial power 1, the first contactor K1, the voltage stabilizing filter circuit 6, the third contactor K3 and the load device 10 are connected in sequence; the commercial power 1 is used as a main power supply to supply power to the load equipment 10; and the voltage stabilizing and filtering circuit 6 is used for performing voltage stabilizing and filtering on the voltage output by the commercial power 1.
The power battery pack 2, the second contactor K2 and the third contactor K3 are connected in sequence; the power battery pack 2 serves as an auxiliary power supply to power the load device 10.
The storage battery 3 is connected with the third contactor K3; the storage battery 3 is used as a standby power supply to supply power to the load device 10, and is also used for storing redundant electric energy generated by the power battery pack 2 and redundant electric energy generated by the commercial power 1. The accumulator 3 is a lithium ion accumulator used as a device for storing electric energy, and is formed by connecting a plurality of batteries in series, and the power supply time of the accumulator is determined by the capacity of the accumulator. The quality and performance of the storage battery 3 directly affect the quality of the whole power supply.
The control module 5 is respectively connected with the first contactor K1, the second contactor K2 and the third contactor K3; the control module 5 is also connected with the output end of the commercial power 1, the output end of the voltage-stabilizing filter circuit 6 and a load respectively; the control module 5 is configured to detect a first voltage signal at an output end of the commercial power 1 and a third voltage signal at an output end of the voltage stabilizing filter circuit 6, and control on/off of the first contactor K1 according to the first voltage signal; the third contactor K3 is controlled to be switched on and off according to the third voltage signal, and the second contactor K2 is controlled to be switched on and off according to the current flowing into the load equipment 10.
In one embodiment, the novel vaccination vehicle multi-source power supply system further comprises a current detector 9; the current detector 9 is connected to the third contactor K3 and the load device 10, respectively.
The current detector 9 is configured to detect a current flowing into the load device 10. The current detector 9 detects the working current of the load end and transmits a signal to the control module 5 through a hard wire, so that the load is judged to be non-working.
In one embodiment, the control module 5 comprises: a detection unit and a control unit; the detection unit is connected with the control unit.
The detection unit is respectively connected with the current detector 9, the output end of the commercial power 1 and the output end of the voltage-stabilizing filter circuit 6; the detection unit is used for processing the first voltage signal to generate a first control signal, processing the third voltage signal to generate a third control signal, and processing the current signal to generate a second control signal. The control module 5 comprises a detection unit, a control unit and a monitoring alarm protection circuit. The detection unit is used for processing the detected voltage and current; the control unit judges whether to control the on-off of a contactor and other electric devices in the circuit to work according to the detection data; the monitoring alarm protection circuit is provided with overcurrent, overvoltage and no-load protection, a battery voltage overlow, battery polarity and alternating current polarity detection circuit, an indicator light and a horn alarm circuit.
The control unit is respectively connected with the first contactor K1, the second contactor K2 and the third contactor K3; the control unit is used for controlling the first contactor K1 to be closed according to the first control signal and controlling the third contactor K3 to be closed according to the third control signal; the control unit is used for controlling the first contactor K1 or the second contactor K2 to be opened according to the second control signal.
In one embodiment, the power module further comprises: a bypass input circuit 4 and a manual service switch K4; the bypass input circuit 4 is connected with the current detector 9 through the manual maintenance switch K4; the bypass input circuit 4 is used for supplying power to the load equipment 10 through the bypass input circuit 4 when the multi-source power supply system of the novel vaccination vehicle is maintained or the storage battery 3 is replaced and the load equipment 10 cannot interrupt power supply; the manual service switch K4 is used to manually switch the bypass input circuit 4.
In one embodiment, the control module 5 is further configured to detect the voltages V1-V8 of the branches, and determine whether the electrical devices of the branches are working properly.
In one embodiment, the novel vaccination vehicle multi-source power supply system further comprises a bidirectional inverter 7 and an inverter 8. The input end of the bidirectional inverter 8 is connected with the storage battery 3, and the output end of the bidirectional inverter 7 is respectively connected with the third contactor K3 and the inverter 8; the output of the inverter 8 is also connected to the third contactor K3.
The inverter 8 is used for inverting the 450V-700V DC voltage of the power battery pack 2 into the AC voltage required by the load device 10.
The bidirectional inverter 7 is configured to detect whether the load device 10 is connected to a power supply, and further configured to invert the dc voltage of the battery 3 to an ac voltage required by the load device 10. The bidirectional inverter 7 is composed of an inverter, an ac charger, and a transfer relay. It can automated inspection have or not the power to insert, can flow into battery 3 with unnecessary electric current when having commercial power 1 to insert, then can switch into the contravariant state in 10ms when no commercial power 1 inserts, and the required voltage of load is inverted into with the voltage reversal of battery 3, and the load does not fall the power when guaranteeing commercial power 1 breaks away from.
In one embodiment, the novel vaccination vehicle multi-source power supply system further comprises an intelligent monitoring and communication circuit; the control module 5 is connected with a computer 11 through the intelligent monitoring and communication circuit. Monitoring software in the computer 11 monitors the operation conditions of the multi-source power supply system and the power supply circuit of the novel vaccination vehicle through a communication circuit, records and prompts the power failure condition, and automatically processes data maintenance and system protection during power failure.
Fig. 2 is a schematic diagram of a multi-source power supply system of a novel vaccination vehicle provided by the present invention, as shown in fig. 2, when a load device 10 is in operation, a main power supply source is that a commercial power 1 is connected to a power supply module, and then is output to the load device 10 through a voltage stabilizing filter circuit 6. The second main Power supply source is provided by the Power battery pack 2, when the bidirectional inverter 7 detects that no commercial Power 1 is input or the voltage of the storage battery 3 is lower than the set voltage, the bidirectional inverter sends a Power supply request to the control module 5, the control module 5 receives the request, and sends the request to a battery management system in a Power Distribution Unit (PDU) through CAN communication to request to close a second contactor K2 of the negative electrode of the battery, after the second contactor K2 is closed, the Power battery pack 2 CAN provide direct-current voltage, the direct-current voltage is inverted into alternating-current voltage required by the load equipment 10 through the internal inverter 8, and meanwhile, the standby storage battery 3 is charged, so that the storage battery 3 is ensured to be not powered off. In fig. 2, the integrated circuit 12 includes the bidirectional inverter 7, the voltage stabilizing filter circuit 6, the current detector 9, and the like.
The power supply of the power battery pack of the vaccination vehicle is used as the input of the second main power supply, and the power battery pack replaces the commercial power 1 to carry out load power supply and supplement the electric quantity of the storage battery 3 in time when the commercial power 1 is suddenly cut off or fails, so that the problems that the electric quantity of the storage battery 3 is insufficient, the long-term power supply cannot be carried out when the failure occurs and the like are avoided.
The bidirectional inverter 7 and the inverter 8 are adopted, so that the space and the cost are saved, the full-digital control is realized, the integration level is high, and the response is fast.
By using the current detector 9, the control module 5 judges the working condition of the electric equipment by detecting the current, controls the inverter 8 to be in standby and disconnect the power supply input when the load equipment 10 does not work, thereby saving the standby power consumption and prolonging the service life of the electric equipment.
The intelligent management mode of the computer is adopted, so that the main functions of centralized monitoring, centralized analysis, centralized data processing and the like of the long-acting power supply can be realized, the distributed duty mode and the management mode of traditional personnel are changed, and the working efficiency is greatly improved.
Fig. 3 is a flow chart of a multi-source power supply method for a novel vaccination vehicle provided by the invention, which includes:
step 301: when the load equipment needs to work, the commercial power is connected to supply power to the load equipment.
Step 302: judging whether the load equipment starts to work, if not, executing a step 303; if yes, go to step 304.
Step 303: judging whether the commercial power is switched on or suddenly cut off or the circuit is in fault, if so, executing a step 305; if not, go to step 306.
Step 304: a first current value flowing into a load device is obtained.
Step 307: judging whether the first current value is larger than a minimum current set value, if so, executing step 311; if not, go to step 310.
Step 305: closing the second contactor K2, judging whether the bidirectional inverter detects power input, if so, executing step 308; if not, go to step 309.
Step 306: there is no action.
Step 308: a second value of current flowing into the load device is obtained.
Step 312: judging whether the second current value is larger than a minimum current set value, if so, executing step 314; if not, go to step 315.
Step 309: the bidirectional inverter enters an inversion mode, and the storage battery supplies power to the load equipment.
Step 310: and determining that no-load equipment works, disconnecting the first contactor and enabling the bidirectional inverter to be in standby.
Step 311: determining that the loaded device is working.
Step 313: and sending a wake-up signal to the bidirectional inverter at a set time interval to enable the bidirectional inverter to be in an inversion state, and supplying power to load equipment through a storage battery.
Step 316: acquiring a third current value flowing into the load equipment, judging whether the third current value is greater than a minimum current set value, and if so, executing a step 317; if not, go to step 318.
Step 317: and determining that the load equipment needs to work, closing the first contactor, and switching the load equipment from the power supply of the storage battery to the power supply of the commercial power.
Step 318: it is determined that no load device operation is required.
Step 314: determining that the loaded device is working.
Step 315: and determining that no-load equipment works, opening the second contactor, and keeping the inverter and the bidirectional inverter in standby.
Step 319: and sending a wake-up signal to the bidirectional inverter at a set time interval to enable the bidirectional inverter to be in an inversion state, and supplying power to load equipment through a storage battery.
Step 320: acquiring a third current value flowing into the load device, determining whether the third current value is greater than a minimum current setting value, if so, executing step 321; if not, go to step 322.
Step 321: and determining that the load equipment needs to work, closing the second contactor, and switching the load equipment from the power supply of the storage battery to the power battery pack for power supply.
Step 322: it is determined that no load device operation is required.
In a specific embodiment, when the load device needs to operate, the load device is powered by the mains supply, which specifically includes:
and judging whether the voltage of the commercial power input end is greater than a set voltage value or not to obtain a fifth judgment result.
If yes, closing the first contactor; if not, returning to the step of judging whether the voltage of the commercial power input end is larger than the set voltage value or not to obtain a fifth judgment result.
Judging whether a third voltage signal at the output end of the voltage-stabilizing filter circuit is equal to a second set voltage value or not, and if so, closing a third contactor; if not, determining that the voltage stabilization fails or the circuit fails.
In one embodiment, when the bidirectional inverter detects a power input of the commercial power or the power battery pack, it is determined whether a third current value flowing into the load device is greater than a maximum current setting value.
If so, the storage battery is not charged by the commercial power or the power supply of the power battery pack; if not, the storage battery is charged while the commercial power or the power supply of the power battery pack supplies power to the load equipment.
The working principle or the working process of the multi-source power supply system of the novel vaccination vehicle is as follows:
the multi-source power supply comprises commercial power, a power battery pack, a storage battery and a bypass input.
1. When the mains supply is powered
The control module 5 detects that the voltage V1 of the commercial power input end is greater than the set value voltage, the K1 contactor is closed, after the commercial power absorbs partial power grid interference through the primary voltage stabilization of the voltage stabilization filter circuit, the voltage V3 end is detected to be equal to the set voltage, then the contactor switch K3 is closed, the voltage V3 is directly provided for load equipment, and otherwise, the voltage stabilization fails or the circuit fails. The current detector 9 detects that the current is transmitted to the control module 5 through a hard wire, and a detection unit in the control module 5 receives the fact that the current detected by the current detector 9 is larger than a minimum set value Imin, which indicates that a load needs to work. If the detected current is smaller than the minimum set value Imin, no-load equipment works, the contactor switch K1 is disconnected and the power supply is saved, meanwhile, the bidirectional inverter enters a standby state, the control unit wakes up the bidirectional inverter at a set time interval and enters an inversion state, the voltage of the storage battery is inverted into the power supply required by the load to be output, current detection is carried out to judge whether the load equipment is in a working state, if the load equipment is in the working state, the control module 5 closes the K1 contactor, and the load power supply is switched into mains supply from the power supply of the storage battery. The detection unit can judge whether the contactor K1 is effectively opened and closed by comparing the voltage values of V1 and V2.
2. Input end power supply of power battery pack
When the load equipment needs to work, the mains supply is not connected or the power is suddenly cut off or the load equipment fails, the control module 5 immediately closes the K2 contactor and wakes up the inverter, the inverter converts the direct current of the power battery into the alternating current required by the load equipment, and the power battery pack replaces the mains supply to supply power to the load and charge the standby battery. If the current detected by the checking unit is smaller than the minimum set value Imin, no-load equipment works, the contactor switch K2 is disconnected and the power is saved, the inverter and the bidirectional inverter enter a standby state, the control unit wakes up the bidirectional inverter at set time intervals and enters an inversion state, the voltage of the storage battery is inverted into the power required by the load to be output, current detection is carried out to judge whether the load equipment is in a working state, if the load equipment is in the working state, the control module 5 closes the K2 contactor and wakes up the inverter, and the load power is switched into a power battery pack to supply power by the power supplied by the storage battery. The detection unit can judge whether the contactor K1 is effectively opened and closed by comparing the voltage values of V5 and V6.
In addition, when the bidirectional inverter detects that the commercial power or the power supply of the power battery pack passes through, the internal transfer relay of the bidirectional inverter is immediately conducted to further charge the storage battery, and at the moment, the storage battery is in a charging state until the storage battery is fully charged and is converted into a floating charging state. The bi-directional inverter will preferentially supply power to the load and the excess energy will charge the battery. If the load current is larger than the set current value Imxa, the bidirectional inverter directly feeds the power supply to the main circuit to supply power to the load, and the storage battery is not charged.
3. Accumulator input end power supply
When the load equipment needs to work, the bidirectional inverter does not detect an input power supply, the bidirectional inverter is rapidly in an inversion mode, the storage battery discharges, the bidirectional inverter converts direct current of the storage battery into alternating current required by the load, and at the moment, the power supply system converts the direct current into the storage battery-the bidirectional inverter to continuously supply power to the load.
If the storage battery feeds power or the bidirectional inverter detects that the voltage of the storage battery drops to a set point, a signal request is sent to the control module 5, the contactor K2 is closed after the module receives the request, the inverter converts the direct current of the power battery pack into alternating current required by a load, and the power battery pack charges the backup battery instead of the storage battery at the moment, so that the storage battery is prevented from being damaged by the power feeding of the storage battery, and serious accidents of the load are prevented from happening due to power failure. And the power battery pack can also be used for supplying power to the storage battery in real time.
4. Bypass maintenance input
When the multi-source power supply system needs to be maintained or the storage battery is replaced and the load power supply cannot be interrupted, the bidirectional inverter switch can be cut off first, then the maintenance bypass switch is put into operation, and then other switches are cut off. The AC power supply continues to supply AC power to the load through the maintenance bypass switch, and at the moment, maintenance personnel can safely maintain the multi-source power supply system.
The control and detection module can judge the voltage and current condition of each branch circuit according to the detection values of V1-V8 so as to judge whether the electric devices of each branch circuit work normally.
In addition, the computer 11 is used as a monitoring platform, and the display of each detection parameter, the recording of the running state and the automatic warning lamp are realized through a software and hardware system. The monitoring module is provided with a standard RS-232 serial interface, one end of a signal wire is connected into a communication interface of the monitoring module, and the other end of the signal wire is connected into a communication network formed by the computer 11, so that data transmission between the monitoring host and the monitoring module is realized.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. For the system disclosed by the embodiment, the description is relatively simple because the system corresponds to the method disclosed by the embodiment, and the relevant points can be referred to the method part for description.
The principles and embodiments of the present invention have been described herein using specific examples, which are provided only to help understand the method and the core concept of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.
Claims (10)
1. A novel vaccination car multisource power supply system which characterized in that includes: the device comprises a power supply module, a control module, a voltage-stabilizing filter circuit and a contactor; the power module comprises commercial power, a power battery pack and a storage battery; the contactor comprises a first contactor, a second contactor and a third contactor;
the mains supply, the first contactor, the voltage stabilizing filter circuit, the third contactor and the load equipment are connected in sequence; the commercial power is used as a main power supply to supply power to load equipment; the voltage stabilizing and filtering circuit is used for performing voltage stabilizing and filtering on the voltage output by the commercial power;
the power battery pack, the second contactor and the third contactor are connected in sequence; the power battery pack is used as an auxiliary power supply to supply power to load equipment;
the storage battery is connected with the third contactor; the storage battery is used as a standby power supply to supply power to load equipment and is also used for storing redundant electric energy generated by the power battery pack and redundant electric energy generated by the commercial power;
the control module is respectively connected with the first contactor, the second contactor and the third contactor; the control module is also respectively connected with the output end of the commercial power, the output end of the voltage-stabilizing filter circuit and the load; the control module is used for detecting a first voltage signal at the output end of the mains supply and a third voltage signal at the output end of the voltage-stabilizing filter circuit, and controlling the on-off of the first contactor according to the first voltage signal; and controlling the on-off of the third contactor according to the third voltage signal, and controlling the on-off of the second contactor according to the current flowing into the load equipment.
2. The novel vaccination vehicle multi-source power supply system of claim 1, further comprising a current detector; the current detector is respectively connected with the third contactor and the load equipment;
the current detector is configured to detect a current flowing into the load device.
3. The novel vaccination vehicle multi-source power supply system of claim 2, wherein the control module comprises: a detection unit and a control unit; the detection unit is connected with the control unit;
the detection unit is respectively connected with the current detector, the output end of the commercial power and the output end of the voltage-stabilizing filter circuit; the detection unit is used for processing the first voltage signal to generate a first control signal, processing the third voltage signal to generate a third control signal, and processing the current signal to generate a second control signal;
the control unit is respectively connected with the first contactor, the second contactor and the third contactor; the control unit is used for controlling the first contactor to be closed according to the first control signal and controlling the third contactor to be closed according to the third control signal; the control unit is used for controlling the first contactor or the second contactor to be disconnected according to the second control signal.
4. The novel vaccination vehicle multi-source power supply system of claim 3, wherein the power module further comprises: a bypass input circuit and a manual service switch;
the bypass input circuit is connected with the current detector through the manual maintenance switch; the bypass input circuit is used for supplying power to the load equipment through the bypass input circuit when the multi-source power supply system of the novel vaccination vehicle is maintained or the storage battery is replaced and the load equipment cannot interrupt power supply; the manual maintenance switch is used for manually switching the bypass input circuit.
5. The novel multi-source power supply system of a vaccination vehicle of claim 4, wherein the control module is further configured to detect the voltage of each branch for determining whether the electric devices of each branch are working normally.
6. The novel vaccination vehicle multi-source power supply system of claim 5, further comprising a bidirectional inverter and an inverter;
the input end of the bidirectional inverter is connected with the storage battery, and the output end of the bidirectional inverter is respectively connected with the third contactor and the inverter; the output end of the inverter is also connected with the third contactor;
the inverter is used for inverting the direct-current voltage of the power battery pack into the alternating-current voltage required by the load equipment;
the bidirectional inverter is used for detecting whether the load equipment is connected with a power supply or not and is also used for inverting the direct-current voltage of the storage battery into alternating-current voltage required by the load equipment.
7. The novel vaccination vehicle multi-source power supply system of claim 1, further comprising an intelligent monitoring and communication circuit; the control module is connected with a computer through the intelligent monitoring and communication circuit;
and monitoring software in the computer monitors the running conditions of the multi-source power supply system and the power supply circuit of the novel vaccination vehicle through a communication circuit, and records and prompts the power failure condition.
8. A novel multi-source power supply method for a vaccination vehicle is characterized by comprising the following steps:
when the load equipment needs to work, the commercial power is connected to supply power to the load equipment;
judging whether the load equipment starts to work or not, and if the load equipment does not start to work, judging whether the commercial power is connected or suddenly cut off or the circuit fails to work to obtain a first judgment result; if the load equipment starts to work, acquiring a first current value flowing into the load equipment;
if the first judgment result is that the commercial power is not connected or suddenly cut off or the circuit fails, closing the second contactor, and judging whether the bidirectional inverter detects the power input to obtain a second judgment result; if the first judgment result is that the mains supply is connected or not powered off or the circuit is not in fault, no action is taken;
if the second judgment result is that the bidirectional inverter detects the power supply input, acquiring a second current value flowing into the load equipment; if the second judgment result is that the bidirectional inverter does not detect the power supply input, the bidirectional inverter enters an inversion mode, and the storage battery supplies power to the load equipment;
judging whether the first current value or the second current value is larger than a minimum set value or not to obtain a third judgment result;
when the third judgment result is that the first current value or the second current value is larger than the minimum set value, determining that the loaded equipment works; when the third judgment result is that the first current value or the second current value is smaller than or equal to a minimum set value, determining that no-load equipment works, disconnecting the first contactor or the second contactor, and enabling the bidirectional inverter to be in a standby state;
sending a wake-up signal to the bidirectional inverter at a set time interval to enable the bidirectional inverter to be in an inversion state, and supplying power to load equipment through a storage battery;
acquiring a third current value flowing into the load equipment, and judging whether the third current value is greater than a minimum current set value or not to obtain a fourth judgment result;
if the fourth judgment result is that the third current value is larger than the minimum current setting value, determining that the load equipment needs to work, and closing the first contactor, wherein the load equipment is switched into the mains supply by the power supply of the storage battery or the second contactor is closed, and the load equipment is switched into the power battery pack by the power supply of the storage battery; and if the fourth judgment result is that the third current value is smaller than or equal to the minimum current set value, determining that no load equipment needs to work.
9. The novel multi-source power supply method for the vaccination vehicle of claim 8, wherein when the load device needs to work, the load device is powered by the mains power, and the method specifically comprises:
judging whether the voltage of the commercial power input end is larger than a set voltage value or not to obtain a fifth judgment result;
if the fifth judgment result is that the first voltage signal is greater than the first set voltage value, closing the first contactor; if the fifth judgment result is that the first voltage signal is less than or equal to the first set voltage value, returning to the step of judging whether the voltage of the commercial power input end is greater than the set voltage value to obtain a fifth judgment result;
judging whether a third voltage signal at the output end of the voltage stabilizing filter circuit is equal to a second set voltage value or not to obtain a sixth judgment result;
if the sixth judgment result is that the third voltage signal is equal to the second set voltage value, closing the third contactor; and if the sixth judgment result is that the third voltage signal is greater than or less than the second set voltage value, determining that the voltage stabilization fails or the circuit fails.
10. A novel vaccination vehicle multi-source power supply method according to claim 9,
when the bidirectional inverter detects that the commercial power or the power supply of the power battery pack is input, judging whether a third current value flowing into the load equipment is larger than a maximum current set value or not;
if the third current value is larger than the maximum current set value, the commercial power or the power supply of the power battery pack does not charge the storage battery; and if the third current value is less than or equal to the maximum current set value, the commercial power or the power supply of the power battery pack supplies power to the load equipment and charges the storage battery.
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| CN202111293832.3A CN113890178A (en) | 2021-11-03 | 2021-11-03 | Novel multi-source power supply system and method for vaccination vehicle |
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