CN221227170U - Charging circuit and charging pile - Google Patents

Charging circuit and charging pile Download PDF

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Publication number
CN221227170U
CN221227170U CN202322718695.4U CN202322718695U CN221227170U CN 221227170 U CN221227170 U CN 221227170U CN 202322718695 U CN202322718695 U CN 202322718695U CN 221227170 U CN221227170 U CN 221227170U
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China
Prior art keywords
circuit
charging
contactor
electrically connected
short circuit
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CN202322718695.4U
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Chinese (zh)
Inventor
毕飞飞
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Sungrow Power Supply Co Ltd
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Sungrow Power Supply Co Ltd
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Priority to CN202322718695.4U priority Critical patent/CN221227170U/en
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/70—Energy storage systems for electromobility, e.g. batteries
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/7072—Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors

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  • Charge And Discharge Circuits For Batteries Or The Like (AREA)

Abstract

The application discloses a charging circuit and a charging pile, and belongs to the technical field of power electronics. The charging circuit comprises a power output unit, a main contactor, a charging gun and a short circuit detection circuit. The first end of the main contactor is electrically connected with the output end of the power output unit; the input end of the charging gun is electrically connected with the second end of the main contactor; the short circuit detection circuit is connected in parallel with the main contactor and is configured to be controlled to switch between an on state and an off state, and detects a current flowing in the on state. According to the charging circuit disclosed by the application, before the main contactor is closed, the short circuit detection circuit is controlled to be in a conducting state, the current flowing through the short circuit detection circuit is detected, whether the short circuit condition exists at the charging gun end is judged, and if the short circuit condition exists, the charging is stopped, so that the large current is prevented from impacting the main contactor, and the service life of the main contactor is prolonged.

Description

Charging circuit and charging pile
Technical Field
The application belongs to the technical field of power electronics, and particularly relates to a charging circuit and a charging pile.
Background
The direct current output of the direct current charging pile is output to the electric automobile through the main direct current contactor and the gun wire, but before the main direct current contactor is closed, the impedance of the charging gun end cannot be known, if the charging gun end is in a short circuit state when the main direct current contactor is closed, the main direct current contactor can bear large current impact, and therefore the service life of the contactor is damaged or reduced.
Disclosure of utility model
The present application aims to solve at least one of the technical problems existing in the prior art. Therefore, the application provides the charging circuit and the charging pile, the short circuit detection circuit detects the current flowing through the charging circuit and judges whether the charging gun end has a short circuit condition, if the charging gun end has the short circuit condition, the charging is stopped, the large current is prevented from impacting the main contactor, and the service life of the main contactor is prolonged.
In a first aspect, the present application provides a charging circuit comprising:
A power output unit;
The first end of the main contactor is electrically connected with the output end of the power output unit;
The input end of the charging gun is electrically connected with the second end of the main contactor;
And a short circuit detection circuit connected in parallel with the main contactor and configured to be controlled to switch between an on state and an off state, and detect a current flowing in the on state.
According to one embodiment of the application, the short circuit detection circuit comprises a switch and a current detection unit connected in series.
According to one embodiment of the application, the current detection unit comprises a thermistor.
According to one embodiment of the application, the thermistor has a positive temperature coefficient.
According to one embodiment of the application, the switch is a relay.
According to one embodiment of the application, the main contactor comprises a positive contactor electrically connected to the positive pole of the power output unit and a negative contactor electrically connected to the negative pole of the power output unit, the short circuit detection circuit being connected in parallel with the positive contactor.
According to one embodiment of the present application, the charging circuit further includes:
and a voltage detection circuit electrically connected between the second end of the positive contactor and the second end of the negative contactor and configured to detect an output voltage.
According to one embodiment of the present application, a voltage detection circuit includes:
the isolation operational amplifier circuit is electrically connected between the second end of the positive contactor and the second end of the negative contactor and is configured to generate a detection signal according to the output voltage;
and the control circuit is electrically connected with the isolation operational amplifier circuit and is configured to determine the output voltage according to the detection signal.
According to one embodiment of the application, the control circuit is electrically connected to the short circuit detection circuit, the positive contactor and the negative contactor, respectively, to achieve on or off control.
In a second aspect, the present application provides a charging pile comprising the charging circuit described above.
According to the charging circuit and the charging pile, before the main contactor is closed, the short circuit detection circuit is used for detecting the current value of the flowing current, and whether the charging gun end has a short circuit condition is judged; if the short circuit condition exists, the charging is stopped, the large current is prevented from impacting the main contactor, and the service life of the main contactor is prolonged.
Additional aspects and advantages of the application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the application.
Drawings
The foregoing and/or additional aspects and advantages of the application will become apparent and may be better understood from the following description of embodiments taken in conjunction with the accompanying drawings in which:
Fig. 1 is one of block diagrams of a charging circuit according to an embodiment of the present application;
FIG. 2 is a second block diagram of a charging circuit according to an embodiment of the present application;
fig. 3 is a third block diagram of a charging circuit according to an embodiment of the present application.
Reference numerals:
The charging device comprises a charging circuit 100, a power output unit 110, a main contactor 120, a charging gun 130, a short circuit detection circuit 140, a current detection unit 141, a voltage detection circuit 150, an isolation operational circuit 151, a control circuit 152, a positive contactor KM1, a negative contactor KM2, a switch K and a thermistor R1.
Detailed Description
Embodiments of the present application are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the application.
In the following description, "circuit" refers to an electrically conductive loop formed by at least one element or sub-circuit through electrical or electromagnetic connection. When an element or circuit is referred to as being "electrically connected to" another element or an element/circuit is "electrically connected between" or two nodes, it can be directly connected to the other element or intervening elements may be present and the connection between the elements may be physical, logical, or a combination thereof. In contrast, when an element is referred to as being "directly electrically connected to" another element, it means that there are no intervening elements present.
In the description, the terms "first," "second," and the like are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the numerical descriptors used herein are interchangeable under appropriate circumstances such that embodiments of the application are capable of operation in sequences other than those illustrated or otherwise described herein, and that the objects identified by "first," "second," etc. are generally of a type and do not limit the number of objects, for example, the first object can be one or more. Furthermore, in the description and claims, "and/or" means at least one of the connected objects, and the character "/", generally means that the associated object is an "or" relationship.
Furthermore, the description of the terms "one embodiment," "some embodiments," "an exemplary embodiment," "an example," "a particular example," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the application. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
As shown in fig. 1, one embodiment of the present application proposes a charging circuit 100, the charging circuit 100 including a power output unit 110, a main contactor 120, a charging gun 130, and a short circuit detection circuit 140. A first end of the main contactor 120 is electrically connected with an output end of the power output unit 110; an input terminal of the charging gun 130 is electrically connected to a second terminal of the main contactor 120; the short circuit detection circuit 140 is connected in parallel with the main contactor 120, configured to controllably switch between an on state and an off state, and detects a current flowing in the on state.
In some embodiments, the power output unit 110 is electrically connected to an external power source, which may be a device capable of providing electrical energy, such as a power grid, a generator, or the like. During charging, the power output unit 110 filters and rectifies the electric energy of the external power supply, and then outputs the electric energy as direct current to supply electric energy to the charging gun 130 and the units inside the circuit. The power output unit 110 includes a positive power output unit and a negative power output unit.
The main contactor 120 is connected between the power output unit 110 and the charging gun 130, and when the main contactor 120 is closed, the electric energy output by the power output unit 110 is transmitted to the charging gun 130; when the main contactor 120 is opened, the power output unit 110 stops transmitting the electric power to the charging gun 130.
A first end of the short circuit detection circuit 140 is electrically connected to a first end of the main contactor 120, and a second end of the short circuit detection circuit 140 is electrically connected to a second end of the main contactor 120. If the output end of the main contactor has a short circuit condition, the impedance of the output end is far lower than that of the output end under the normal condition during the short circuit. The current flowing through the short detection circuit 140 is much higher than the current value when the output of the main contactor is normal when there is a short condition at the output of the main contactor.
Before the main contactor is closed, the short circuit detection circuit 140 is controlled to be in a conducting state, and if the current flowing through the short circuit detection circuit 140 is in a normal range (such as 100A-300A), the short circuit condition does not occur at the output end of the main contactor; if the short circuit detection circuit 140 detects a current value far greater than a normal value (e.g., greater than 500A), it indicates that a short circuit condition occurs at the output of the main contactor.
If no short circuit condition occurs at the output end of the main contactor, the short circuit detection circuit 140 is controlled to be in an open state, the main contactor is closed, and the power output unit 110 supplies electric energy for the charging gun.
According to the charging circuit 100 of the present application, before the main contactor is closed, the short circuit detection circuit 140 is controlled to be in a conducting state, the magnitude of the current flowing through the short circuit detection circuit 140 is detected, whether the short circuit condition exists at the charging gun 130 end is judged, if the short circuit condition exists, charging is stopped, the large current is prevented from impacting the main contactor 120, and the service life of the main contactor 120 is prolonged.
As shown in fig. 2, in some embodiments, the short circuit detection circuit 140 includes a switch K and a current detection unit 141 in series.
The first end of the switch K is electrically connected to the output terminal of the positive power output unit, and the second end of the switch K is electrically connected to the first end of the current detection unit 141. When the switch K is turned on, the current detection unit 141 is connected to a circuit to detect the current in the circuit and judge whether a short circuit condition occurs; when the switch K is turned off, the current detecting unit 141 is turned off, reducing the consumption of electric energy in the circuit.
As shown in fig. 2, in some embodiments, the current detection unit 141 includes a thermistor R1.
When the short circuit condition occurs in the charging circuit 100, the current in the circuit is larger, and the thermistor R1 consumes more current, so that the temperature of the thermistor R1 is increased, and the resistance of the thermistor R1 is changed. By adding a detection circuit to the current detection unit 141, the resistance value of the thermistor R1 is detected in real time, and the current in the circuit can be judged by comparing with a table of the resistance value of the thermistor changing along with the current.
In some embodiments, thermistor R1 has a positive temperature coefficient.
In the embodiment of the present application, the thermistor R1 may be a PTC (Positive Temperature Coefficient ) thermistor, and the resistance value increases stepwise with an increase in temperature when a certain temperature is exceeded. When a short circuit occurs in the circuit where the thermistor R1 is located in the charging circuit 100, most of the current will be consumed on the thermistor R1, resulting in an increase in the temperature of the thermistor R1 and an increase in the resistance of the thermistor R1.
In some embodiments, switch K is a relay.
The relay adopts an electromagnetic driving mode generally, when the circuit is powered on, the electromagnet is electrified, so that the armature in the relay is attracted, the circuit is conducted, and the service life and the stability are long.
In embodiments of the present application, the switch K uses a low current high voltage relay that provides reliable contacts under low current and high voltage conditions. Low current high voltage relays typically have lower contact resistance and therefore generate less heat when the contact state changes in a high voltage environment, thereby improving reliability.
As shown in fig. 2, in some embodiments, the main contactor 120 includes a positive contactor KM1 electrically connected to the positive pole of the power output unit 110 and a negative contactor KM2 electrically connected to the negative pole of the power output unit 110, and the short circuit detection circuit 140 is connected in parallel with the positive contactor KM 1.
The first end of the short circuit detection circuit 140 is electrically connected to the first end of the positive contactor KM1, and the second end of the short circuit detection circuit 140 is electrically connected to the second end of the positive contactor KM 1. After the charging command is issued, the negative contactor KM2 is first closed, and then the switch K in the short circuit detection circuit 140 is closed. The portion electrically connected to the second terminal of the main contactor 120 is equivalent to a dc output impedance. The dc power output from the power output unit 110 at this time forms a closed loop through the short circuit detection circuit 140, the dc output impedance, and the negative contactor KM 2. When the DC output impedance value is lower than the normal state or approximately zero, the current in the circuit flows through the thermistor R1, so that the thermistor R1 heats.
As shown in fig. 3, in some embodiments, the charging circuit 100 further includes a voltage detection circuit 150, the voltage detection circuit 150 being electrically connected between the second terminal of the positive contactor KM1 and the second terminal of the negative contactor KM2 and configured to detect an output voltage.
The voltage detection circuit 150 detects the voltage value across the dc output impedance. The dc output impedance and the thermistor R1 form a series structure, and the voltage output by the power output unit 110 is the sum of the dc output impedance and the voltages at the two ends of the thermistor R1.
As can be seen from the foregoing, when the output end of the main contactor 120 is shorted, the thermistor R1 generates heat, the resistance increases in a step-like manner, when the current output by the power output unit 100 is constant, the voltage drop across the thermistor R1 increases, the voltage divided by the dc output impedance decreases, and the value of the output voltage detected by the voltage detection circuit 150 is far lower than the value of the output voltage of the power output unit 110, which indicates that the second end of the main contactor 120 is shorted.
As shown in fig. 3, in some embodiments, the voltage detection circuit 150 includes an isolated operational amplifier circuit 151 and a control circuit 152. The isolated operational amplifier circuit 151 is electrically connected between the second end of the positive contactor KM1 and the second end of the negative contactor KM2, and is configured to generate a detection signal according to the output voltage; the control circuit 152 is electrically connected to the isolated operational amplifier 151 and configured to determine an output voltage based on the detection signal.
The isolated operational amplifier 151 includes an input isolation stage and an output stage. The isolation stage of the isolation op-amp 151 may isolate the output voltage from the input voltage to protect the load at the output. The voltage output by the second end of the main contactor 120 is isolated by the isolation operational amplifier circuit 151, and then is output as an isolated voltage after a certain amplification factor, and the isolated voltage is used as a detection signal for detecting whether a short circuit condition occurs at the second end of the contactor.
In some embodiments, the control circuit 152 is electrically connected to the short circuit detection circuit 140, the positive contactor KM1, and the negative contactor KM2, respectively, to achieve on or off control.
After the control circuit 152 receives the charging instruction, the switch K and the negative contactor KM2 of the short circuit detection circuit 140 are driven to be turned on first, the positive contactor KM1 is driven to be kept in an off state, and after the detection circuit transmits fault information to the control circuit 152, the control circuit 152 issues an instruction to stop charging, and the switch K and the negative contactor KM2 of the short circuit detection circuit 140 are turned off.
One embodiment of the present application proposes a charging pile including the charging circuit 100 described above.
According to the charging pile provided by the application, before the main contactor 120 is closed, the short circuit detection circuit 140 is controlled to be in a conducting state, the magnitude of current flowing through the short circuit detection circuit 140 is detected, whether the short circuit condition exists at the output end of the main contactor 120 is judged, if the short circuit condition exists, charging is stopped, the large current is prevented from impacting the main contactor, and the service life of the main contactor is prolonged.
While embodiments of the present application have been shown and described, it will be understood by those of ordinary skill in the art that: many changes, modifications, substitutions and variations may be made to the embodiments without departing from the spirit and principles of the application, the scope of which is defined by the claims and their equivalents.

Claims (10)

1. A charging circuit, comprising:
A power output unit;
The first end of the main contactor is electrically connected with the output end of the power output unit;
The input end of the charging gun is electrically connected with the second end of the main contactor;
And a short circuit detection circuit connected in parallel with the main contactor and configured to be controlled to switch between an on state and an off state, and detect a current flowing in the on state.
2. The charging circuit of claim 1, wherein the short circuit detection circuit comprises a switch and a current detection unit in series.
3. The charging circuit of claim 2, wherein the current detection unit comprises a thermistor.
4. A charging circuit according to claim 3, wherein the thermistor has a positive temperature coefficient.
5. The charging circuit of claim 2, wherein the switch is a relay.
6. The charging circuit of any one of claims 1-5, wherein the main contactor comprises a positive contactor electrically connected to a positive pole of the power output unit and a negative contactor electrically connected to a negative pole of the power output unit, the short circuit detection circuit being connected in parallel with the positive contactor.
7. The charging circuit of claim 6, wherein the charging circuit further comprises:
And a voltage detection circuit electrically connected between the second end of the positive contactor and the second end of the negative contactor and configured to detect an output voltage.
8. The charging circuit of claim 7, wherein the voltage detection circuit comprises:
An isolation operational amplifier circuit electrically connected between the second end of the positive contactor and the second end of the negative contactor and configured to generate a detection signal according to an output voltage;
And the control circuit is electrically connected with the isolation operational amplifier circuit and is configured to determine output voltage according to the detection signal.
9. The charging circuit of claim 8, wherein the control circuit is electrically connected to the short circuit detection circuit, the positive contactor, and the negative contactor, respectively, to achieve on or off control.
10. Charging pile, characterized in that it comprises a charging circuit according to any one of claims 1-9.
CN202322718695.4U 2023-10-09 2023-10-09 Charging circuit and charging pile Active CN221227170U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202322718695.4U CN221227170U (en) 2023-10-09 2023-10-09 Charging circuit and charging pile

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202322718695.4U CN221227170U (en) 2023-10-09 2023-10-09 Charging circuit and charging pile

Publications (1)

Publication Number Publication Date
CN221227170U true CN221227170U (en) 2024-06-25

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Family Applications (1)

Application Number Title Priority Date Filing Date
CN202322718695.4U Active CN221227170U (en) 2023-10-09 2023-10-09 Charging circuit and charging pile

Country Status (1)

Country Link
CN (1) CN221227170U (en)

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