CN117153623A - Protection method, system and storage medium for relay contact protection circuit - Google Patents
Protection method, system and storage medium for relay contact protection circuit Download PDFInfo
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- CN117153623A CN117153623A CN202311032128.1A CN202311032128A CN117153623A CN 117153623 A CN117153623 A CN 117153623A CN 202311032128 A CN202311032128 A CN 202311032128A CN 117153623 A CN117153623 A CN 117153623A
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- 238000000034 method Methods 0.000 title claims abstract description 31
- 238000001514 detection method Methods 0.000 claims description 18
- 230000002159 abnormal effect Effects 0.000 claims description 12
- 230000005856 abnormality Effects 0.000 claims description 3
- 230000003111 delayed effect Effects 0.000 abstract description 5
- 230000006870 function Effects 0.000 description 7
- 230000008033 biological extinction Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 230000002035 prolonged effect Effects 0.000 description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 3
- 239000003990 capacitor Substances 0.000 description 3
- 230000001939 inductive effect Effects 0.000 description 3
- 238000010891 electric arc Methods 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 230000005674 electromagnetic induction Effects 0.000 description 2
- 230000007257 malfunction Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000008054 signal transmission Effects 0.000 description 2
- 230000001629 suppression Effects 0.000 description 2
- 230000001360 synchronised effect Effects 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000002457 bidirectional effect Effects 0.000 description 1
- 238000004590 computer program Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 238000005286 illumination Methods 0.000 description 1
- 230000005389 magnetism Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H47/00—Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current
- H01H47/002—Monitoring or fail-safe circuits
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H47/00—Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current
- H01H47/02—Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current for modifying the operation of the relay
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- Relay Circuits (AREA)
Abstract
The utility model relates to the field of relay protection circuits, in particular to a protection method, a protection system and a storage medium for a relay contact protection circuit. The method comprises the steps that an MOS tube is connected in series in a relay contact loop, when a relay contact protection circuit is started to supply power, an MCU main chip sends a C1 control signal to drive a relay driving circuit, a C11 signal is output to control the normally open contact of the relay to be closed, and after the first time is delayed, the MCU main chip sends a C2 control signal to open the MOS tube to a working state; when the power supply is disconnected, the MCU main chip sends out a C2 control signal to control the MOS tube to stop working, and after the second time is delayed, the MCU main chip sends out a C1 control signal to drive the relay driving circuit, and the output C11 signal controls the normally open contact of the relay to be disconnected. The utility model controls the power supply time sequence of the relay contact protection circuit to ensure that no current passes through the relay contact loop, thereby eliminating the arc in the circuit.
Description
Technical Field
The utility model relates to the field of relay protection circuits, in particular to a protection method, a protection system and a storage medium for a relay contact protection circuit.
Background
In the relay controlling the on-off of the load, a mass of gas which is extremely high in temperature, emits intense light and can conduct electricity, namely an arc, is usually generated in the contact gap due to the fact that the voltage or the current exceeds a certain value in the atmosphere. Arc discharge can ablate contacts, so that the service life of the relay and the working reliability of related electric appliances are reduced; arcing can also create electromagnetic interference, causing errors in signal transmission or malfunction of associated equipment. Appropriate measures have to be taken in the circuit to extinguish the arc.
For example, chinese patent No. CN204315471U discloses a relay controlled heavy current load contact protection circuit, which includes a resistive or inductive load RL, a relay RL1, one end of the resistive or inductive load RL is connected to a first contact terminal J1 of the relay RL1, the other end of the resistive or inductive load RL and a second contact terminal J2 of the relay RL1 are respectively connected to a power source, so as to form a loop, and a bidirectional thyristor TR1 is connected in parallel between the first contact terminal J1 and the second contact terminal J2 of the relay RL 1.
The Chinese patent No. 207624626U also provides a relay arc suppression circuit and control equipment, wherein the relay arc suppression circuit comprises a relay, a relay control circuit and a relay control circuit, wherein the relay comprises an exciting coil and a contact switch; the diode is connected with the exciting coil in parallel and provides a short circuit channel for high-voltage pulse generated by the exciting coil; the contact protection circuit is connected with a contact switch of the relay and used for protecting the contact switch when the exciting coil generates high-voltage pulse; the contact protection circuit comprises a protection capacitor connected in parallel with two ends of the contact switch, a protection resistor connected in series with the protection capacitor and a piezoresistor connected in parallel with two ends of the contact switch.
However, when the parameter selection is improper, the two utility models cannot achieve a good arc extinction effect in application. Such as: when the series resistance is larger, the charge and discharge time of the capacitor can be longer, the absorption effect on overvoltage is longer, and a better arc extinction effect cannot be achieved.
Accordingly, the present utility model provides a protection method, system, and storage medium for a relay contact protection circuit for eliminating arcing in the circuit.
Disclosure of Invention
Aiming at the technical problems, the utility model provides a protection method, a protection system and a storage medium for a relay contact protection circuit, so as to eliminate electric arcs in the circuit.
In a first aspect, the present utility model provides a protection method for a relay contact protection circuit, where the relay contact protection circuit includes an MCU main chip, a relay driving circuit, a relay, a power supply device, a MOS tube, a current detection circuit, and an electric device, where the MOS tube further includes an IGN power supply ignition switch, where the MOS tube is connected in series in a relay contact loop, and the method includes the following steps:
s1, when the relay contact protection circuit is started to supply power, the MCU main chip sends a C1 control signal to drive the relay driving circuit, the relay driving circuit is started and outputs a C11 signal to control the relay, so that a normally open contact of the relay is closed, after a first time delay, the MCU main chip sends a C2 control signal, the MOS tube is opened to a working state through the C2 control signal, and at the moment, the electric equipment starts to be electrified;
s2, when the relay contact protection circuit is powered off, the MCU main chip sends out the C2 control signal to control the MOS tube to stop working, at the moment, the power supply of the electric equipment is disconnected, after a second time delay, the MCU main chip sends out the C1 control signal to drive the relay driving circuit, the relay driving circuit is started, and the C11 signal is output to control the relay, so that the normally open contact of the relay is disconnected;
and controlling the power supply time sequence of the relay contact protection circuit through the step S1 and the step S2, so that no current passes through the relay contact loop.
As a preferred technical solution of the present utility model, the present utility model further includes: during normal operation of the relay contact protection circuit, the current detection circuit continuously detects working current in the relay contact circuit, a detection result of the working current in the relay contact circuit IS returned to the MCU main chip through an IS signal, the MCU main chip judges whether the working current in the relay contact circuit IS abnormal, if the working current in the relay contact circuit IS abnormal, the MCU main chip sends out a C2 control signal to control the MOS tube to be disconnected, so that the relay contact protection circuit stops working, wherein the abnormality refers to overload or short circuit.
As a preferable technical scheme of the utility model, the relay controls components of the operation of the secondary loop contact end through the primary loop coil, the primary loop coil is low in current, and the secondary loop contact end is high in current.
As a preferable technical scheme of the utility model, when the normally open contact is closed, the MOS tube is high in resistance, and no current passes through the relay contact loop.
As a preferable technical scheme of the utility model, the value range of the first time is between 1 ms and 1000 ms.
As a preferable technical scheme of the utility model, when the normally open contact is opened, the MOS tube is high in resistance, and no current passes through the relay contact loop.
As a preferable technical scheme of the utility model, the value range of the second time is between 1 ms and 1000 ms.
In a second aspect, the present utility model provides a protection system for a relay contact protection circuit, the system comprising:
the MCU main chip IS used for carrying out data acquisition, logic processing and driving control, directly controlling a relay driving circuit through a C1 control signal, finally realizing that power supply equipment outputs current to the MOS tube through the attraction of the contacts, directly controlling the work of the MOS tube through the driving of the C2 control signal, and returning mirror current in a relay contact circuit detected by a current detection circuit through an IS control signal to judge whether the working current of the relay contact circuit IS overloaded or shorted;
the relay driving circuit is used for driving the relay coil to work;
the relay is used for controlling the operation of the secondary loop contact end through the primary loop coil;
the power supply device is used for providing power for the relay contact loop;
the MOS tube is used for eliminating electric arcs in the circuit and is a key component;
the current detection circuit is used for detecting the magnitude of working current in the relay contact circuit and judging whether the working current is abnormal, wherein the abnormal refers to overload or short circuit;
the electric equipment, representing load equipment, is a service object for supplying power to the relay contact loop.
In a third aspect, the present utility model also provides a computing device, the device comprising:
a memory and a processor;
the memory is configured to store computer executable instructions, and the processor is configured to execute the computer executable instructions, where the computer executable instructions when executed by the processor implement a method for protecting a relay contact protection circuit as described above.
In a fourth aspect, the present utility model further provides a storage medium storing computer executable instructions that when executed by a processor implement a method for protecting a relay contact protection circuit as described above.
Compared with the prior art, the utility model has the following beneficial effects:
1. according to the technical scheme, the MOS tube is connected in series in the relay contact loop, when the relay contact protection circuit is started to supply power, the MCU main chip sends out a C1 control signal to drive the relay driving circuit, the relay driving circuit is started and outputs a C11 signal to control the relay, so that the normally open contact of the relay is closed, after the first time is delayed, the MCU main chip sends out a C2 control signal, the MOS tube is opened to a working state through the C2 control signal, and at the moment, electric equipment starts to be electrified; when the relay contact protection circuit is powered off, the MCU main chip sends a C2 control signal to control the MOS tube to stop working, at the moment, the power supply of the electric equipment is disconnected, after a second time delay, the MCU main chip sends a C1 control signal to drive the relay driving circuit, the relay driving circuit is started, and a C11 signal is output to control the relay, so that the normally open contact of the relay is disconnected; by controlling the power supply time sequence of the relay contact protection circuit, no current passes through the relay contact loop, and no current passes through the relay contact loop, so that high-voltage arc can not be generated.
2. According to the technical scheme, the current detection circuit is additionally arranged in the relay contact loop while the power supply time sequence is controlled, and is used for detecting that the current is overlarge during normal working of a load, and the MCU main chip sends out a C2 control signal to control the relay contact loop, so that components in the relay contact loop are disconnected and stop working, and the purpose of protecting the components in the relay contact loop is achieved.
Drawings
In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings that are required to be used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only embodiments of the present utility model, and that other drawings can be obtained according to the provided drawings without inventive effort for a person skilled in the art.
FIG. 1 is a flow chart of the steps of a method for protecting a relay contact protection circuit according to the present utility model;
fig. 2 is a construction diagram of a protection system of a relay contact protection circuit according to the present utility model.
Detailed Description
The present utility model will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present utility model more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the utility model.
It will be understood that the terms "first," "second," and the like, as used herein, may be used to describe various elements, but these elements are not limited by these terms unless otherwise specified. These terms are only used to distinguish one element from another element. For example, a first xx script may be referred to as a second xx script, and similarly, a second xx script may be referred to as a first xx script, without departing from the scope of this disclosure.
In the relay controlling the on-off of the load, a mass of gas which is extremely high in temperature, emits intense light and can conduct electricity, namely an arc, is usually generated in the contact gap due to the fact that the voltage or the current exceeds a certain value in the atmosphere. Arc discharge can ablate contacts, so that the service life of the relay and the working reliability of related electric appliances are reduced; arcing can also create electromagnetic interference, causing errors in signal transmission or malfunction of associated equipment. Appropriate measures have to be taken in the circuit to extinguish the arc.
Aiming at the technical problems, the inventor provides a protection method of a relay contact protection circuit shown in fig. 1, wherein the relay contact protection circuit comprises an MCU main chip, a relay driving circuit, a relay, power equipment, a MOS tube, a current detection circuit and electric equipment, the MOS tube further comprises an IGN power supply ignition switch, the MOS tube is connected in series in a relay contact loop, and the method comprises the following steps:
s1, when the relay contact protection circuit is started to supply power, the MCU main chip sends a C1 control signal to drive the relay driving circuit, the relay driving circuit is started and outputs a C11 signal to control the relay, so that a normally open contact of the relay is closed, after a first time delay, the MCU main chip sends a C2 control signal, the MOS tube is opened to a working state through the C2 control signal, and at the moment, the electric equipment starts to be electrified;
s2, when the relay contact protection circuit is powered off, the MCU main chip sends out the C2 control signal to control the MOS tube to stop working, at the moment, the power supply of the electric equipment is disconnected, after a second time delay, the MCU main chip sends out the C1 control signal to drive the relay driving circuit, the relay driving circuit is started, and the C11 signal is output to control the relay, so that the normally open contact of the relay is disconnected;
and controlling the power supply time sequence of the relay contact protection circuit through the step S1 and the step S2, so that no current passes through the relay contact loop.
Specifically, the MOS tube is connected in series in the relay contact loop to control the power supply time sequence, so that no current passes through the relay contact loop during relay driving control, and high-voltage arc is not generated. Wherein controlling the power supply sequence comprises opening the relay contact protection circuit power supply sequence and opening the relay contact protection circuit power supply sequence. The process of starting the Relay contact protection circuit power supply time sequence is that a C1 control signal is sent out by an MCU main chip to drive a Relay driving circuit, the Relay driving circuit is started, a C11 signal is output to control a Relay, a normally open contact of the Relay is closed, at the moment, an MOS tube is high in resistance, no current passes through a Relay contact loop, after a first time delay, a C2 control signal is sent out by the MCU main chip to enable the MOS tube to be opened to a working state, and electric equipment starts to be electrified; how much of the first time can be scaled between 1 ms and 1000 ms depending on the function application. The power supply time sequence is disconnected, namely, a C2 control signal is sent out by the MCU main chip to stop the work of the MOS tube, the power supply of the electric equipment is disconnected, after the second time is delayed, a C1 control signal is sent out by the MCU main chip to drive the Relay driving circuit, the Relay driving circuit is started, and a C11 signal is output to control the Relay, so that the normally open contact of the Relay is disconnected, the MOS tube is high in resistance, and no current passes through the Relay contact circuit; the amount of the second time may also be defined between 1 ms and 1000 ms depending on the function application, where Relay is a Relay in the present utility model.
Through the control time sequence, no current passes through the loop during relay driving control, so that high-voltage arc cannot be generated, the service life of the relay is greatly prolonged, and the service life of the relay is possibly prolonged to be 10 times or even more than 100 times.
According to the utility model, the MOS tube is connected in series in the relay contact loop, and because the MOS tube has extremely small working impedance and good conductive characteristic, the MOS tube has high withstand voltage, the generation of arc phenomenon is completely eradicated from hardware, the MOS tube is a key component for arc extinction, and meanwhile, the MCU main chip is used for controlling the time sequence to match, so that the perfect arc extinction effect is achieved.
Further, the method further comprises the following steps: during normal operation of the relay contact protection circuit, the current detection circuit continuously detects working current in the relay contact circuit, a detection result of the working current in the relay contact circuit IS returned to the MCU main chip through an IS signal, the MCU main chip judges whether the working current in the relay contact circuit IS abnormal, if the working current in the relay contact circuit IS abnormal, the MCU main chip sends out a C2 control signal to control the MOS tube to be disconnected, so that the relay contact protection circuit stops working, wherein the abnormality refers to overload or short circuit.
Specifically, when controlling the power supply time sequence, a current detection circuit is added in the relay contact loop and is used for detecting that the load normally works, if the current is overlarge, a C2 control signal is sent out by the MCU main chip to control the relay contact loop, so that components in the relay contact loop are disconnected to stop working, and the purpose of protecting the components in the relay contact loop is achieved, wherein the components comprise various electrical hardware devices. The power supply device may be a KL30 power supply, or may be other power supply devices.
Furthermore, the relay controls components of the working of the secondary loop contact end through the primary loop coil, the primary loop coil is small current, and the secondary loop contact end is large current.
Specifically, the Relay controls components of the secondary loop contact end (high current) working through a primary loop coil (low current). It is generally composed of iron core, coil, contact and spring. When the coil passes a certain current, the iron core is magnetized, so that the contact is attracted to be closed, and the conduction of a circuit is realized. Conversely, when the coil is de-energized, the core loses magnetism and the contacts are opened and the circuit is broken. The principle that the Relay works by controlling the large current through the small current is to utilize the electromagnetic induction principle. When a certain current passes through the primary loop coil (small current), a magnetic field is generated, and the magnetic field and an iron core in the secondary loop generate electromagnetic induction, so that contacts in the secondary loop are closed, and the large-current circuit conduction is realized. Specifically, the current in the primary loop coil generates a magnetic field in the core that generates a magnetic flux that changes in the core, thereby generating an induced electromotive force in the secondary loop. The induced electromotive force can enable the contacts in the secondary loop to act, so that the small-current control and the large-current work are realized. The Relay has wide application in a circuit, and can be used for controlling various electric equipment, wherein the electric equipment represents load equipment such as a door lock, a motor, illumination, an air conditioner and the like. Meanwhile, the system can also be used for realizing functions such as remote control and automatic control.
Further, when the normally open contact is closed, the MOS tube is high-resistance, and no current passes through the relay contact loop.
Specifically, when the normally open contact is closed, the MOS tube is in a high resistance state, and no current passes through the relay contact loop. In this case, the relay functions to transfer the signal of the primary loop to the secondary loop, thereby achieving control and switching of the circuit. The closing of the normally open contact indicates that certain conditions, such as voltage, current or time, are met in the primary loop, and this information is transferred to the secondary loop, thereby controlling the circuit on-off of the secondary loop. When the normally open contact is disconnected, the MOS tube can block the current in the secondary loop, so that the circuit and the electrical equipment are protected.
Further, the value of the first time ranges from 1 ms to 1000 ms.
Specifically, the value of the first time is calibrated according to the function application and can be between 1 millisecond and 1000 milliseconds, and after the relay contacts are closed due to the existence of the delay time, the electric equipment can have stable current to pass through, so that the damage to the equipment caused by instantaneous high voltage is avoided. Because the current in the secondary circuit increases suddenly when the relay contacts are closed, this may cause the consumer to be damaged by the impact of the momentary high voltage. In order to protect equipment, delay the first time, make the MOS pipe open again, can let the electric current increase gradually, avoid the condition of high pressure to take place in the twinkling of an eye. Thus, the electric equipment can have stable current to pass, and the service life of the equipment is prolonged.
Furthermore, when the normally open contact is disconnected, the MOS tube is high-resistance, and no current passes through the relay contact loop.
Specifically, when the normally open contact is opened, the MOS tube is in a high resistance state, and no current passes through the relay contact loop. Under the condition, the high-resistance state of the MOS tube is equivalent to a switch, and the on-off of the current in the secondary loop is controlled. The opening of the normally open contact indicates that certain conditions in the primary loop are not met, such as voltage, current or time, and the like, and the information is transmitted to the secondary loop, so that the circuit on-off of the secondary loop is controlled. When the normally open contact is closed, the MOS tube can block the current in the secondary loop, so that the circuit and the electrical equipment are protected.
Further, the second time has a value ranging from 1 ms to 1000 ms.
Specifically, the value of the second time is calibrated according to the function application, and can be between 1 millisecond and 1000 milliseconds, and the delay of the second time is to enable the normally open contact of the Relay to be disconnected so as to prevent the MOS tube from working for a long time at high temperature and prevent the MOS tube from being damaged due to overhigh temperature. In the circuit, the MOS tube carries the function of controlling the current to pass, but the MOS tube can be damaged when the MOS tube works at a high temperature for a long time. In order to avoid the situation, when the electric equipment does not need to pass through the electric equipment, the MOS tube is firstly stopped, the power supply of the electric equipment is disconnected, and then the normally open contact of the Relay is disconnected after the first time delay. In order to enable the MOS tube to be gradually cooled after the power supply is disconnected, the damage caused by overhigh temperature is prevented. Meanwhile, the normally open contact of the Relay can be gradually cooled after the power supply is disconnected, and the service life of the Relay is prolonged.
The utility model also provides a protection system of the relay contact protection circuit shown in fig. 2, which comprises:
the MCU main chip IS used for carrying out data acquisition, logic processing and driving control, directly controlling a relay driving circuit through a C1 control signal, finally realizing that power supply equipment outputs current to the MOS tube through the attraction of the contacts, directly controlling the work of the MOS tube through the driving of the C2 control signal, and returning mirror current in a relay contact circuit detected by a current detection circuit through an IS control signal to judge whether the working current of the relay contact circuit IS overloaded or shorted;
the relay driving circuit is used for driving the relay coil to work;
the relay is used for controlling the operation of the secondary loop contact end through the primary loop coil;
the power supply device is used for providing power for the relay contact loop;
the MOS tube is used for eliminating electric arcs in the circuit and is a key component;
the current detection circuit is used for detecting the magnitude of working current in the relay contact circuit and judging whether the working current is abnormal, wherein the abnormal refers to overload or short circuit;
the electric equipment, representing load equipment, is a service object for supplying power to the relay contact loop.
A memory and a processor;
the memory is used for storing computer executable instructions, and the processor is used for executing the computer executable instructions, and the computer executable instructions are executed by the processor to realize the protection method of the relay contact protection circuit.
The utility model also provides a computer storage medium which stores program instructions, wherein the equipment where the computer storage medium is located is controlled to execute the protection method of the relay contact protection circuit when the program instructions run.
In summary, according to the technical scheme provided by the utility model, the MOS tube is connected in series in the relay contact loop, when the relay contact protection circuit is started to supply power, the MCU main chip sends out a C1 control signal to drive the relay driving circuit, the relay driving circuit is started and outputs a C11 signal to control the relay, so that the normally open contact of the relay is closed, after the first time is delayed, the MCU main chip sends out a C2 control signal, the MOS tube is opened to a working state through the C2 control signal, and at the moment, the electric equipment starts to be electrified; when the relay contact protection circuit is powered off, the MCU main chip sends a C2 control signal to control the MOS tube to stop working, at the moment, the power supply of the electric equipment is disconnected, after a second time delay, the MCU main chip sends a C1 control signal to drive the relay driving circuit, the relay driving circuit is started, and a C11 signal is output to control the relay, so that the normally open contact of the relay is disconnected; by controlling the power supply time sequence of the relay contact protection circuit, no current passes through the relay contact loop, and no current passes through the relay contact loop, so that high-voltage arc can not be generated.
The current detection circuit is additionally arranged in the relay contact loop while controlling the power supply time sequence and is used for detecting that the current is overlarge during the normal working period of the load, and the MCU main chip sends out a C2 control signal to control the relay contact loop, so that components in the relay contact loop are disconnected and stop working, and the purpose of protecting the components in the relay contact loop is achieved.
It should be understood that, although the steps in the flowcharts of the embodiments of the present utility model are shown in order as indicated by the arrows, these steps are not necessarily performed in order as indicated by the arrows. The steps are not strictly limited to the order of execution unless explicitly recited herein, and the steps may be executed in other orders. Moreover, at least some of the steps in various embodiments may include multiple sub-steps or stages that are not necessarily performed at the same time, but may be performed at different times, nor do the order in which the sub-steps or stages are performed necessarily performed in sequence, but may be performed alternately or alternately with at least a portion of the sub-steps or stages of other steps or other steps.
Those skilled in the art will appreciate that implementing all or part of the above-described methods may be accomplished by way of computer programs, which may be stored on a non-transitory computer readable storage medium, and which, when executed, may comprise the steps of the embodiments of the methods described above. Any reference to memory, storage, database, or other medium used in embodiments provided herein may include non-volatile and/or volatile memory. The nonvolatile memory can include Read Only Memory (ROM), programmable ROM (PROM), electrically Programmable ROM (EPROM), electrically Erasable Programmable ROM (EEPROM), or flash memory. Volatile memory can include Random Access Memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in a variety of forms such as Static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double Data Rate SDRAM (DDRSDRAM), enhanced SDRAM (ESDRAM), synchronous Link DRAM (SLDRAM), memory bus direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM), among others.
The technical features of the above embodiments may be arbitrarily combined, and for brevity, all of the possible combinations of the technical features of the above embodiments are not described, however, they should be considered as the scope of the description of the present specification as long as there is no contradiction between the combinations of the technical features.
The foregoing examples have been presented to illustrate only a few embodiments of the utility model and are described in more detail and are not to be construed as limiting the scope of the utility model. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the utility model, which are all within the scope of the utility model. Accordingly, the scope of protection of the present utility model is to be determined by the appended claims.
The foregoing description of the preferred embodiments of the utility model is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the utility model.
Claims (10)
1. The protection method of the relay contact protection circuit is characterized in that the relay contact protection circuit comprises an MCU main chip, a relay driving circuit, a relay, power equipment, a MOS tube, a current detection circuit and electric equipment, wherein the MOS tube further comprises an IGN power supply ignition switch, the MOS tube is connected in series in a relay contact loop, and the method comprises the following steps:
when the relay contact protection circuit is started to supply power, the MCU main chip sends a C1 control signal to drive the relay driving circuit, the relay driving circuit is started and outputs a C11 signal to control the relay, so that a normally open contact of the relay is closed, after a first time delay, the MCU main chip sends a C2 control signal, the MOS tube is opened to a working state through the C2 control signal, and at the moment, the electric equipment starts to be electrified;
when the relay contact protection circuit is powered off, the MCU main chip sends out the C2 control signal to control the MOS tube to stop working, at the moment, the power supply of the electric equipment is disconnected, after a second time delay, the relay driving circuit is driven by the C1 control signal sent out by the MCU main chip, and the relay driving circuit is started and outputs the C11 signal to control the relay, so that the normally open contact of the relay is disconnected;
and controlling the power supply time sequence of the relay contact protection circuit through the steps, so that no current passes through the relay contact loop.
2. The method for protecting a relay contact protection circuit according to claim 1, further comprising: during normal operation of the relay contact protection circuit, the current detection circuit continuously detects working current in the relay contact circuit, a detection result of the working current in the relay contact circuit IS returned to the MCU main chip through an IS signal, the MCU main chip judges whether the working current in the relay contact circuit IS abnormal, if the working current in the relay contact circuit IS abnormal, the MCU main chip sends out a C2 control signal to control the MOS tube to be disconnected, so that the relay contact protection circuit stops working, wherein the abnormality refers to overload or short circuit.
3. The method of claim 1, wherein the relay controls components of the secondary loop contact terminal operation through a primary loop coil, the primary loop coil being low current and the secondary loop contact terminal being high current.
4. The method of claim 1, wherein when the normally open contact is closed, the MOS transistor is high-resistance and no current passes through the relay contact circuit.
5. The method of claim 4, wherein the first time has a value in the range of 1 ms to 1000 ms.
6. The method of claim 1, wherein when the normally open contact is opened, the MOS transistor is high-resistance, and no current passes through the relay contact circuit.
7. The method of claim 6, wherein the second time is in a range of 1 ms to 1000 ms.
8. A protection system for a relay contact protection circuit for implementing a protection method according to any one of claims 1-7, the system comprising:
the MCU main chip IS used for carrying out data acquisition, logic processing and driving control, directly controlling a relay driving circuit through a C1 control signal, finally realizing that power supply equipment outputs current to the MOS tube through the attraction of the contacts, directly controlling the work of the MOS tube through the driving of the C2 control signal, and returning mirror current in a relay contact circuit detected by a current detection circuit through an IS control signal to judge whether the working current of the relay contact circuit IS overloaded or shorted;
the relay driving circuit is used for driving the relay coil to work;
the relay is used for controlling the operation of the secondary loop contact end through the primary loop coil;
the power supply device is used for providing power for the relay contact loop;
the MOS tube is used for eliminating electric arcs in the circuit and is a key component;
the current detection circuit is used for detecting the magnitude of working current in the relay contact circuit and judging whether the working current is abnormal, wherein the abnormal refers to overload or short circuit;
the electric equipment, representing load equipment, is a service object for supplying power to the relay contact loop.
9. A computing device, the device comprising:
a memory and a processor;
the memory is configured to store computer executable instructions, and the processor is configured to execute the computer executable instructions, which when executed by the processor implement a method of protecting a relay contact protection circuit according to any one of claims 1 to 7.
10. A computer storage medium, characterized in that the storage medium stores program instructions, wherein the program instructions, when run, control a device in which the storage medium is located to perform a method of protecting a relay contact protection circuit according to any one of claims 1 to 7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311032128.1A CN117153623A (en) | 2023-08-16 | 2023-08-16 | Protection method, system and storage medium for relay contact protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311032128.1A CN117153623A (en) | 2023-08-16 | 2023-08-16 | Protection method, system and storage medium for relay contact protection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117153623A true CN117153623A (en) | 2023-12-01 |
Family
ID=88911075
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311032128.1A Pending CN117153623A (en) | 2023-08-16 | 2023-08-16 | Protection method, system and storage medium for relay contact protection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117153623A (en) |
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2023
- 2023-08-16 CN CN202311032128.1A patent/CN117153623A/en active Pending
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