CN220896319U - Protection circuit of charging device and charging device - Google Patents
Protection circuit of charging device and charging device Download PDFInfo
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- CN220896319U CN220896319U CN202322618150.6U CN202322618150U CN220896319U CN 220896319 U CN220896319 U CN 220896319U CN 202322618150 U CN202322618150 U CN 202322618150U CN 220896319 U CN220896319 U CN 220896319U
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Abstract
The application discloses a protection circuit of a charging device and the charging device, and belongs to the technical field of electronics and electrics. The protection circuit includes: the first switch module is used for providing a closing control signal for the control end of the first contactor when the first opening signal is received through the first switch control end; the second switch module is used for providing a closing control signal for the control end of the second contactor when receiving a second opening signal through the second switch control end; the logic operation module is used for: when the first opening signal and the second opening signal are received, an opening control signal is provided for a control end of the bridging contactor; when the third switch control end receives the third opening signal, if the first opening signal and the second opening signal are not received at the same time, a closing control signal is provided for the control end of the bridging contactor. The application can help to avoid the occurrence of dangerous situations that different charging paths in the charging device are accidentally bridged.
Description
Technical Field
The present application relates to the field of electronic and electrical technologies, and in particular, to a protection circuit of a charging device and a charging device.
Background
With the development and popularization of new energy automobiles, the continuous voyage mileage of the pure electric automobile breaks through the new height continuously, and the requirements of the market on the aspect of quick charging are also higher and higher. For this reason, in the common two rifle direct current of charging station use fills electric pile, can increase a set of direct current contactor that is used for carrying out the power bridging on its direct current output busbar generally for two rifle direct current fill electric pile can utilize two sets of power to charge in coordination under the single rifle mode of charging, help promoting the power of charging and fill electric pile's power utilization, increase the speed of charging.
However, the addition of the dc contactor also brings some potential safety hazards, for example, in the case that the dual-gun dc charging pile is used at the same time, if the two sets of power supplies are accidentally bridged due to incorrect operation, equipment failure or external signal interference, abnormal current flow is generated between charging paths with different charging voltages, which may cause serious accidents such as burning the charging pile, burning electric vehicles or causing fire.
Disclosure of Invention
The application provides a protection circuit of a charging device and the charging device, which can help to avoid the occurrence of dangerous situations that different charging paths in the charging device are accidentally bridged.
The embodiment of the application provides a protection circuit of a charging device, which comprises a first contactor, a second contactor and a bridging contactor, wherein the bridging contactor is respectively connected with the first contactor and the second contactor; the protection circuit includes:
The input end of the first switch module is connected with a first switch control end of the protection circuit, the output end of the first switch module is used for being connected with the control end of the first contactor, and the first switch module is used for providing a closing control signal for the control end of the first contactor when a first opening signal is received through the first switch control end so as to enable a first charging passage where the first contactor is located in the charging device to be in a conducting state;
The input end of the second switch module is connected with a second switch control end of the protection circuit, the output end of the second switch module is used for being connected with the control end of the second contactor, and the second switch module is used for providing a closing control signal for the control end of the second contactor when a second opening signal is received through the second switch control end so as to enable a second charging passage where the second contactor is located in the charging device to be in a conducting state; and
The first input end, the second output end and the third input end of the logic operation module are respectively connected with the first switch control end, the second switch control end and the third switch control end of the protection circuit, the output end of the logic operation module is used for being connected with the control end of the bridging contactor, and the logic operation module is used for:
When the first opening signal and the second opening signal are received, an opening control signal is provided for the control end of the bridging contactor so that a bridging passage of the charging device where the bridging contactor is located is turned into an opening state; and
When a third opening signal is received through the third switch control end, if the first opening signal and the second opening signal are not received at the same time, a closing control signal is provided for the control end of the bridge contactor so that the bridge passage is turned into a conducting state;
Wherein the bridge path is a path of the charging device bridged between the first charging path and the second charging path.
In some possible implementations, the logic operation module includes an exclusive-or gate and a first nand gate; the first input end and the second input end of the exclusive-OR gate are respectively connected with the first input end and the second output end of the logic operation module, and the output end of the exclusive-OR gate is connected with the first input end of the first NAND gate; the second input end of the first NAND gate is connected with the third output end of the logic operation module, and the output end of the first NAND gate is connected with the control end of the bridge contactor.
In some possible implementations, the first switch module includes a second nand gate, a first input terminal of the second nand gate is connected to a high level voltage terminal, a second input terminal of the second nand gate is connected to an input terminal of the first switch module, and an output terminal of the second nand gate is connected to an output terminal of the first switch module; the second switch module comprises a third NAND gate, a first input end of the third NAND gate is connected with the high-level voltage end, a second input end of the third NAND gate is connected with the input end of the second switch module, and an output end of the third NAND gate is connected with the output end of the second switch module.
In some possible implementations, the protection circuit further includes a first resistor, a second resistor, and a first capacitor; two ends of the first resistor are respectively connected with a common end and a second input end of the second NAND gate; two ends of the second resistor are respectively connected with a common end and a second input end of the third NAND gate; and two ends of the first capacitor are respectively connected with the common end and the high-level voltage end.
The embodiment of the application also provides a charging device, which comprises the protection circuit of any one of the above.
In some possible implementations, at least one of the first contactor, the second contactor, and the bridge contactor includes a drive module and a relay; the relay comprises a coil, a first end of the coil is connected with a positive power supply voltage end, and a second end of the coil is connected with an output end of the driving module; the input end of the driving module is connected with the control end of the first contactor, the second contactor or the bridging contactor, and the driving module is used for switching the passage between the output end of the driving module and the negative power supply voltage end into a conducting state when the input end of the driving module is provided with a closing control signal, and switching the passage between the output end of the driving module and the negative power supply voltage end into an opening state when the input end of the driving module is provided with an opening control signal.
In some possible implementations, at least one of the first contactor, the second contactor, and the bridge contactor further includes a photo coupler, and a control end of the first contactor, the second contactor, or the bridge contactor is connected to an input end of the driving module through the photo coupler.
In some possible implementations, the driving module includes a third resistor and a first transistor, an input terminal of the driving module is connected to a first terminal of the third resistor and a gate of the first transistor, a second terminal of the third resistor is connected to the negative supply voltage terminal, a first pole of the first transistor is connected to an output terminal of the driving module, a second pole of the first transistor is connected to the negative supply voltage terminal, and the first pole and the second pole are each one of a source and a drain.
In some possible implementations, at least one of the first contactor, the second contactor, and the bridge contactor further includes a fourth resistor and a relay indicator, a first end of the fourth resistor is connected to the output end of the driving module and the second end of the coil, respectively, a second end of the fourth resistor is connected to the first end of the relay indicator, and a second end of the relay indicator is connected to the first end of the coil.
In some possible implementations, the charging device is a charging stake apparatus configured with at least two charging guns.
In the embodiment of the application, the first switch module and the second switch module in the protection circuit respectively and independently control the on-off states of the two charging paths of the charging device, the logic operation module in the protection circuit controls the on-off states of the bridging paths between the two charging paths, and the logic operation module provides the disconnection control signal for the control end of the bridging contactor when the protection circuit simultaneously receives the corresponding opening signals of the two charging paths, so that the bridging paths are locked into the disconnection state when the two charging paths are in the on state, the situation that accidents are easy to occur due to the simultaneous conduction of the bridging paths and the two charging paths can be avoided, the safety performance and the reliability of the charging device such as a charging pile are improved, and the occurrence of safety accidents is reduced.
Drawings
Fig. 1 is a block diagram showing a configuration of a protection circuit of a charging device according to an embodiment of the present application;
fig. 2 is a schematic circuit diagram of a protection circuit of a charging device according to an embodiment of the present application;
fig. 3 is a circuit configuration diagram of a contactor according to an embodiment of the present application.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the present application more apparent, the embodiments of the present application will be described in further detail with reference to the accompanying drawings.
In the present application, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art according to the specific circumstances. The term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.
Fig. 1 is a block diagram illustrating a protection circuit of a charging device according to an embodiment of the present application. Referring to fig. 1, the charging apparatus includes a first contactor 120, a second contactor 130, and a bridge contactor 140, and the protection circuit 110 includes a first switch module 111, a second switch module 112, and a logic operation module 113. The protection circuit is a circuit component for preventing accidental bridging between different charging paths in a charging device, which may be, for example, a charging peg (such as a charging peg device provided with two, three, four or more charging guns), a charger, a charging power supply, a charging station or a component part of any one of them. In some examples, the protection circuit is a component of a charging device; in other examples, the protection circuit is an additional component independent of the charging device; in still other examples, a portion of the protection circuit is included in the charging device and another portion is independent of the charging device.
Referring to fig. 1, an input end of the first switch module 111 is connected to a first switch control end S1 of the protection circuit 110, an output end of the first switch module 111 is used for being connected to a control end P1 of the first contactor 120, and the first switch module 111 is used for providing a closing control signal to the control end P1 of the first contactor 120 when receiving a first opening signal through the first switch control end S1, so that a first charging path where the first contactor 120 is located in the charging device is turned into a conducting state. The input end of the second switch module 112 is connected to the second switch control end S2 of the protection circuit 110, the output end of the second switch module 112 is used for being connected to the control end P2 of the second contactor 130, and the second switch module 112 is used for providing a closing control signal to the control end P2 of the second contactor 130 when receiving a second opening signal through the second switch control end S2, so that a second charging path of the charging device where the second contactor 130 is located is turned into a conducting state. The first input end, the second output end and the third input end of the logic operation module 113 are respectively connected to the first switch control end S1, the second switch control end S2 and the third switch control end S3 of the protection circuit 110, and the output end of the logic operation module 113 is used for connecting to the control end P3 of the bridge contactor 140. The logic operation module 113 is configured to provide an opening control signal to the control terminal P3 of the bridge contactor 140 when receiving the first opening signal and the second opening signal, so that the bridge circuit of the charging device where the bridge contactor 140 is located is turned into an open state. The logic operation module 113 is further configured to provide a closing control signal to the control terminal P3 of the bridge contactor 140 to turn the bridge circuit into a conductive state when the third switch control terminal S3 receives the third opening signal and if the first opening signal and the second opening signal are not received at the same time. The bridge path is a path bridging between the first charging path and the second charging path in the charging device.
In one example, the first charging path of the charging device is respectively provided with a first power supply and a first charging port at two ends, and the second charging path of the charging device is respectively provided with a second power supply and a second charging port at two ends. Thus, the first power supply can provide the charging power output outwards through the first charging port when the first charging path where the first contactor 120 is located is in the on state, and the second power supply can provide the charging power output outwards through the second charging port when the second charging path where the second contactor 130 is located is in the on state. When the bridge connection passage is in a conducting state, a bridge connection current can be formed between the first charging passage and the second charging passage, so that the first power supply and the second power supply can provide charging electric energy output outwards through the first charging port or the second charging port; when the bridge passage is in an off state, the first charging passage and the second charging passage work independently and do not influence each other. However, when the first charging path and the second charging path are in the on state at the same time, no matter whether the third switch control terminal S3 receives the third on signal, the logic operation module 113 provides the control terminal P3 of the bridge contactor 140 with the off control signal, so that the bridge path is not turned on at this time, and the dangerous situation that the bridge path and the two charging paths are turned on at the same time to easily cause accidents is avoided. Specifically, according to the circuit configuration described above, the operating states of the charging device in the combination of different on signal output states are shown in table 1 below.
Table 1 working state of charging device under different opening signal combinations
It can be seen that, in the embodiment of the present application, the first switch module 111 and the second switch module 112 in the protection circuit 110 respectively control the on-off states of two charging paths of the charging device, the logic operation module 113 in the protection circuit 110 controls the on-off states of the bridge connection paths between the two charging paths, and the logic operation module 113 provides the control end of the bridge connection contactor 140 with the off control signal when the protection circuit 110 receives the on signals corresponding to the two charging paths at the same time, so that the bridge connection paths are locked to be in the off state when the two charging paths are in the on state, which can help to avoid the occurrence of the situation that the bridge connection paths and the two charging paths are simultaneously conducted to easily cause accidents, and help to improve the safety performance and reliability of the charging device, and reduce the occurrence of safety accidents.
Fig. 2 is a schematic circuit diagram of a protection circuit of a charging device according to an embodiment of the present application. Referring to fig. 2, the logic operation module 113 in the embodiment of the present application includes an exclusive or gate X1 and a first nand gate U1, the first switch module 111 includes a second nand gate U2, and the second switch module 112 includes a third nand gate U3.
The first input end of the exclusive-or gate X1 is connected to the first input end of the logic operation module 113 connected to the first switch control end S1, the second input end of the exclusive-or gate X1 is connected to the second output end of the logic operation module 113 connected to the second switch control end S2, the output end of the exclusive-or gate X1 is connected to the first input end of the first nand gate U1, the second input end of the first nand gate U2 is connected to the third output end of the logic operation module 113 connected to the third switch control end S3, and the output end of the first nand gate U1 is connected to the output end of the logic operation module 113 connected to the control end P3 of the bridge contactor 140. In this way, when the first switch control terminal S1 receives the first on signal corresponding to the high level of logic "1", and the second switch control terminal S2 receives the second on signal corresponding to the high level of logic "1", the exclusive or gate X1 outputs the low level signal corresponding to logic "0" through the output terminal, which causes the signal output by the first nand gate U1 through the output terminal to be locked to the off control signal corresponding to the high level of logic "1", that is, the function of providing the off control signal to the control terminal P3 of the bridge contactor 140 when the first on signal and the second on signal are received by the logic operation module 113 described above, so as to turn the bridge path where the bridge contactor 140 is located in the charging device into the off state is implemented.
Moreover, when only one of the first turn-on signal and the second turn-on signal is received, the exclusive or gate X1 outputs a high level signal corresponding to logic "1" through the output terminal, so that the logic value of the signal output by the first nand gate U1 through the output terminal at this time is opposite to the logic value of the signal at the third switch control terminal S3, that is: when receiving a third opening signal of a high level corresponding to logic '1' at the third switch control end S3, the first NAND gate U1 outputs a closing control signal of a low level corresponding to logic '0' through an output end; when the third switch control terminal S3 receives the low level signal corresponding to the logic "0", the first nand gate U1 outputs the high level open control signal corresponding to the logic "1" through the output terminal, so as to realize the function of the logic operation module 113 that if the third switch control terminal S3 receives the third open signal, the first open signal and the second open signal are not received at the same time, the control terminal P3 of the bridge contactor 140 is provided with the close control signal, so that the bridge path is turned into the on state.
Further, when the low level signal corresponding to logic "0" is received at both the first switch control terminal S1 and the second switch control terminal S2, the exclusive or gate X1 outputs the low level signal corresponding to logic "0" through the output terminal, which causes the signal output by the first nand gate U1 through the output terminal to be locked as the off control signal corresponding to the high level of logic "1". That is, in the case where neither the first nor the second charging path is on, the control terminal P3 of the bridge contactor 140 is locked to the closed control signal regardless of whether the third opening signal is received at the third switch control terminal S3, so that the bridge path is locked to the open state. Therefore, the situation that the bridge current is generated between the first power supply and the second power supply when the charging device is not in operation to easily cause accidents or influence the service life can be avoided, and the safety and the reliability of the charging device can be improved.
Referring to fig. 2, a first input end of the second nand gate U2 is connected to the high-level voltage end V1, a second input end of the second nand gate U2 is connected to an input end of the first switch module 111 connected to the first control end S1, and an output end of the second nand gate U2 is connected to an output end of the first switch module 111 connected to the control end P1 of the first contactor 120; the first input end of the third nand gate U3 is connected to the high-level voltage end V1, the second input end of the third nand gate U3 is connected to the input end of the second switch module 112 connected to the second switch control end S2, and the output end of the third nand gate U3 is connected to the output end of the second switch module 112 connected to the control end P2 of the second contactor 130. In this way, the logic value of the signal output by the second nand gate U2 through the output terminal is opposite to the logic value of the signal at the first switch control terminal S1, and the logic value of the signal output by the third nand gate U3 through the output terminal is opposite to the logic value of the signal at the second switch control terminal S2, namely: when the first switch control terminal S1 receives the first opening signal corresponding to the high level of logic "1", the second nand gate U2 outputs the closing control signal corresponding to the low level of logic "0" through the output terminal, so as to realize the function of "providing the closing control signal to the control terminal P1 of the first contactor 120 when the first opening signal is received through the first switch control terminal S1, so that the first charging path of the first contactor 120 in the charging device is turned into the conducting state"; when the second switch control terminal S2 receives the second on signal corresponding to the high level of logic "1", the third nand gate U3 outputs the close control signal corresponding to the low level of logic "0" through the output terminal, so as to realize the function of "providing the close control signal to the control terminal P2 of the second contactor 130 when the second on signal is received through the second switch control terminal S2, so that the second charging path of the second contactor 130 in the charging device is turned into the on state". Conversely, when the low level signal corresponding to logic "0" is received at the first switch control terminal S1/the second switch control terminal S2, the second nand gate U2/the third nand gate U3 outputs the high level port control signal corresponding to logic "1" through the output terminal, so that the first charging path/the second charging path is turned to the off state, and no charging power output is provided to the outside.
In addition, referring to fig. 2, in some examples, the protection circuit 110 further includes at least one of a first resistor R1, a second resistor R2, and a first capacitor C1, wherein: two ends of the first resistor R1 are respectively connected with the common end and the second input end of the second NAND gate U2 so as to help stabilize the signal voltage at the second input end of the second NAND gate U2; two ends of the second resistor R2 are respectively connected with the common terminal and the second input terminal of the third NAND gate U3 to help stabilize the signal voltage at the second input terminal of the third NAND gate U3; the two ends of the first capacitor C1 are respectively connected with the common end and the high-level voltage end V1 to help reduce high-frequency noise on the high-level voltage end V1 and improve the working stability of the circuit.
It should be understood that the above is given not only a plurality of examples of the protection circuit for the charging device, but also a plurality of examples of the charging device including any one of the protection circuits described above. On the basis of any one of the above-described charging devices, at least one of the first contactor 120, the second contactor 130, and the bridging contactor 140 may have a circuit structure as shown in fig. 3.
Referring to fig. 3, the main components in the circuit structure include a photo coupler OC1, a driving module 121, and a relay K1, wherein the relay K1 includes a coil having a first end connected to a positive power voltage terminal VP and a second end connected to an output terminal Q2 of the driving module 121; the control terminal P1/P2/P3 of the first contactor 120, the second contactor 130 or the bridge contactor 140 is connected to the input terminal Q1 of the driving module 121 through the optocoupler OC1, and the driving module 121 is configured to switch the path between the output terminal thereof and the negative power supply voltage terminal VN to an on state when the control terminal P1/P2/P3 is supplied with the close control signal, and switch the path between the output terminal thereof and the negative power supply voltage terminal VN to an off state when the control terminal P1/P2/P3 is supplied with the open control signal. The relay K1 may be disposed, for example, in the first charging path, the second charging path, or the bridge path, and when the two ends of the coil are energized, the internal element may be turned from an open state to a closed state, so that the corresponding path is turned to a conductive state; when the control terminal P1/P2/P3 receives a low-level closing control signal corresponding to logic "0", the light emitting diode inside the photo coupler OC1 emits light under the action of the potential difference between the high-level voltage terminal V1 and the low-level closing control signal, so that the photosensitive device inside the photo coupler OC1 is turned into a low-resistance state, and a positive power voltage terminal VP provides a positive power voltage to the input terminal Q1 of the driving module 121 through a sixth resistor R6; thus, the driving module 121 switches the path between the output end and the negative power supply voltage end VN to be in a conductive state, so that the two ends of the coil in the relay K1 are electrified, and the on-off state of the first charging path, the second charging path or the bridge path is switched to be in a conductive state.
It can be seen that the photo coupler OC1 plays a role of isolation, which can make the circuit structure connected between the high-level voltage terminal V1 and the common terminal and the circuit structure connected between the positive power supply voltage terminal VP and the negative power supply voltage terminal VN not mutually affect. Of course, the photo-coupler OC1 may be replaced by other circuit structures with or without isolation function according to the application requirements (i.e. a section of wire is replaced (i.e. the photo-coupler OC1 is removed to directly connect the control terminal P1/P2/P3 with the input terminal Q1 of the driving module 121), which is not limited in this embodiment of the present application.
As an example, the driving module 121 includes a third resistor R3 and a first transistor T1, an input terminal Q1 of the driving module 121 is connected to a first terminal of the third resistor R3 and a gate of the first transistor T1, respectively, a second terminal of the third resistor R3 is connected to the negative power voltage terminal VN, a first pole of the first transistor T1 is connected to an output terminal Q2 of the driving module 121, and a second pole of the first transistor T1 is connected to the negative power voltage terminal VN, wherein the first pole and the second pole are one of a source and a drain, respectively. In this way, when the positive power supply voltage VP is provided to the input terminal Q1 of the driving module 121 through the sixth resistor R6, the first transistor T1 operates in the linear region or the saturation region, and when the output terminal Q2 of the driving module 121 has a potential difference with the negative power supply voltage VN, a current having a potential pull-down effect on the output terminal Q2 of the driving module 121 is formed, so that the two ends of the coil in the relay K1 are energized, and the function of switching the path between the output terminal and the negative power supply voltage VN to the on state when the control terminal P1/P2/P3 is provided with the closing control signal is realized; conversely, when the input terminal Q1 of the driving module 121 is not supplied with the positive power supply voltage, the gate of the first transistor T1 is supplied with the negative power supply voltage of the negative power supply voltage terminal VN, so that the first transistor T1 works in the cut-off region, and the output terminal Q2 of the driving module 121 is in a suspended state, so that the two ends of the coil in the relay K1 are not energized, thereby realizing the function of switching the path between the output terminal thereof and the negative power supply voltage terminal VN to the off state. Of course, the above-described functions of the driving module 121 may also be implemented using other switching circuits.
Further, referring to fig. 3, as an example, at least one of the first contactor 120, the second contactor 130, and the bridge contactor 140 further includes a fourth resistor R4 and a relay indicator lamp D1, a first end of the fourth resistor R4 is connected to the output end Q2 of the driving module 121 and a second end of the coil, respectively, a second end of the fourth resistor R4 is connected to the first end of the relay indicator lamp D1, and a second end of the relay indicator lamp D1 is connected to the first end of the coil. When the two ends of the coil are electrified, the relay indicator lamp D1 emits light to prompt the relay to work in a state of conducting the corresponding passage; when the two ends of the coil are not electrified, the relay indicator lamp D1 does not emit light, and the relay is prompted to work in a state of disconnecting the corresponding passage.
Note that, the fourth resistor R4, the fifth resistor R5, and the sixth resistor R6 shown in fig. 3 are current limiting resistors as optional components, and may be replaced by other circuit configurations having the same equivalent resistance value. Taking this as an example, each part in fig. 2 and fig. 3 may be replaced by a circuit structure with the same or similar functions, which is not limited in this embodiment of the present application.
Any combination of the above optional solutions may be adopted to form an optional embodiment of the present application, which is not described herein. The foregoing description of the preferred embodiments of the present application is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements within the spirit and principles of the present application.
Claims (10)
1. A protection circuit of a charging device, wherein the charging device comprises a first contactor, a second contactor and a bridging contactor, and the bridging contactor is respectively connected with the first contactor and the second contactor; the protection circuit includes:
The input end of the first switch module is connected with a first switch control end of the protection circuit, the output end of the first switch module is used for being connected with the control end of the first contactor, and the first switch module is used for providing a closing control signal for the control end of the first contactor when a first opening signal is received through the first switch control end so as to enable a first charging passage where the first contactor is located in the charging device to be in a conducting state;
The input end of the second switch module is connected with a second switch control end of the protection circuit, the output end of the second switch module is used for being connected with the control end of the second contactor, and the second switch module is used for providing a closing control signal for the control end of the second contactor when a second opening signal is received through the second switch control end so as to enable a second charging passage where the second contactor is located in the charging device to be in a conducting state; and
The first input end, the second output end and the third input end of the logic operation module are respectively connected with the first switch control end, the second switch control end and the third switch control end of the protection circuit, the output end of the logic operation module is used for being connected with the control end of the bridging contactor, and the logic operation module is used for:
When the first opening signal and the second opening signal are received, an opening control signal is provided for the control end of the bridging contactor so that a bridging passage of the charging device where the bridging contactor is located is turned into an opening state; and
When a third opening signal is received through the third switch control end, if the first opening signal and the second opening signal are not received at the same time, a closing control signal is provided for the control end of the bridge contactor so that the bridge passage is turned into a conducting state;
Wherein the bridge path is a path of the charging device bridged between the first charging path and the second charging path.
2. The protection circuit of claim 1, wherein the logic operation module comprises an exclusive-or gate and a first nand gate; wherein,
The first input end and the second input end of the exclusive-OR gate are respectively connected with the first input end and the second output end of the logic operation module, and the output end of the exclusive-OR gate is connected with the first input end of the first NAND gate;
The second input end of the first NAND gate is connected with the third output end of the logic operation module, and the output end of the first NAND gate is connected with the control end of the bridge contactor.
3. The protection circuit according to claim 1 or 2, wherein the first switch module comprises a second nand gate, a first input terminal of the second nand gate is connected to a high-level voltage terminal, a second input terminal of the second nand gate is connected to an input terminal of the first switch module, and an output terminal of the second nand gate is connected to an output terminal of the first switch module;
The second switch module comprises a third NAND gate, a first input end of the third NAND gate is connected with the high-level voltage end, a second input end of the third NAND gate is connected with the input end of the second switch module, and an output end of the third NAND gate is connected with the output end of the second switch module.
4. The protection circuit of claim 3, further comprising a first resistor, a second resistor, and a first capacitor;
two ends of the first resistor are respectively connected with a common end and a second input end of the second NAND gate;
two ends of the second resistor are respectively connected with a common end and a second input end of the third NAND gate;
and two ends of the first capacitor are respectively connected with the common end and the high-level voltage end.
5. A charging device, characterized in that the charging device comprises the protection circuit of any one of claims 1 to 4.
6. The charging device of claim 5, wherein at least one of the first contactor, the second contactor, and the bridge contactor comprises a drive module and a relay;
The relay comprises a coil, a first end of the coil is connected with a positive power supply voltage end, and a second end of the coil is connected with an output end of the driving module;
The input end of the driving module is connected with the control end of the first contactor, the second contactor or the bridging contactor, and the driving module is used for switching a passage between the output end of the driving module and a negative power supply voltage end into a conducting state when the control end of the first contactor, the second contactor or the bridging contactor is provided with a closing control signal, and switching a passage between the output end of the driving module and the negative power supply voltage end into an opening state when the control end of the first contactor, the second contactor or the bridging contactor is provided with an opening control signal.
7. The charging device of claim 6, wherein at least one of the first contactor, the second contactor, and the bridge contactor further comprises a photo coupler through which a control end of the first contactor, the second contactor, or the bridge contactor is connected to an input end of the drive module.
8. The charging device according to claim 6 or 7, wherein the driving module comprises a third resistor and a first transistor, the input terminal of the driving module being connected to a first terminal of the third resistor and the gate of the first transistor, respectively, the second terminal of the third resistor being connected to the negative supply voltage terminal, the first pole of the first transistor being connected to the output terminal of the driving module, the second pole of the first transistor being connected to the negative supply voltage terminal, the first pole and the second pole being one of a source and a drain, respectively.
9. The charging device of claim 6 or 7, wherein at least one of the first contactor, the second contactor, and the bridge contactor further comprises a fourth resistor and a relay indicator light, a first end of the fourth resistor being connected to the output of the drive module and the second end of the coil, respectively, a second end of the fourth resistor being connected to the first end of the relay indicator light, and a second end of the relay indicator light being connected to the first end of the coil.
10. The charging device of claim 5, wherein the charging device is a charging stake apparatus configured with at least two charging guns.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322618150.6U CN220896319U (en) | 2023-09-26 | 2023-09-26 | Protection circuit of charging device and charging device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322618150.6U CN220896319U (en) | 2023-09-26 | 2023-09-26 | Protection circuit of charging device and charging device |
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| Publication Number | Publication Date |
|---|---|
| CN220896319U true CN220896319U (en) | 2024-05-03 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322618150.6U Active CN220896319U (en) | 2023-09-26 | 2023-09-26 | Protection circuit of charging device and charging device |
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| Country | Link |
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| CN (1) | CN220896319U (en) |
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2023
- 2023-09-26 CN CN202322618150.6U patent/CN220896319U/en active Active
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