CN117584788A - A bypass control circuit and equipment for an AC charging pile - Google Patents

Abstract

This application relates to the field of charging pile control, and in particular to a bypass control circuit and equipment for an AC charging pile. The circuit includes a voltage sampling module, a computing processing module and a bypass action module. The voltage sampling module is used to obtain input The pile signal and the output pile signal, the first DC signal is output according to the input pile signal, and the second DC signal is output according to the output pile signal; the operation processing module is used to output the first DC signal according to the first DC signal and the The second DC signal outputs an action determination DC signal; the bypass action module is used to determine the DC signal according to the action and control the bypass conduction of the charging pile. This application has the beneficial effect of fully utilizing the production capacity of the AC charging pile and reducing the waste of production capacity due to malfunction of the AC charging pile.

Description

A bypass control circuit and equipment for an AC charging pile

Technical field

The present application relates to the field of charging pile control, and in particular, to a bypass control circuit and equipment for an AC charging pile.

Background technique

With the rapid development of new energy vehicles, AC charging piles with high cost performance are widely used. At present, multiple AC charging piles are mainly connected in series. However, AC charging piles connected in series may be damaged due to the failure of one AC charging pile. If the power fails and it is determined that the AC input of the subsequent AC charging pile is faulty, it will shut down and lock up, causing the charging pile before the faulty charging pile to be disconnected without load, and the subsequent AC charging pile will be disconnected from the input AC for a long time, seriously affecting production capacity. . Therefore, how to fully utilize the production capacity of AC charging piles and reduce the wasted production capacity due to failure of AC charging piles is an urgent technical problem that needs to be solved.

Contents of the invention

The purpose of this application is to fully utilize the production capacity of AC charging piles and reduce the wasted production capacity of AC charging piles due to malfunctions.

The above technical purpose of this application is achieved through the following technical solutions:

A bypass control circuit for an AC charging pile, the circuit includes a voltage sampling module, an arithmetic processing module and a bypass action module;

The circuit is connected to an AC charging pile, and the AC charging pile includes a first line and a second line, and both the first line and the second line include an input end and an output end; the first line A first bypass is connected in parallel between the input end and the output end of the first line, and a second bypass is connected in parallel between the input end of the second line and the output end of the second line;

The voltage sampling module includes an input sampling unit and an output sampling unit;

The input sampling unit connects the input end sampling point of the first line and the input end sampling point of the second line to obtain the input pile signal and output the first DC signal according to the input pile signal;

The output sampling unit connects the output end sampling point of the first line and the output end sampling point of the second line, and is used to obtain the output pile signal and output a second DC signal according to the output pile signal;

The operation processing module includes an integrated operation unit and a judgment control unit;

The integrated operation unit is used to output a voltage difference signal according to the first DC signal and the second DC signal; the judgment control unit is used to output an action judgment DC signal according to the voltage difference signal. Signal;

The bypass action module includes a first bypass unit and a second bypass unit;

The first bypass unit is used to determine the DC signal according to the action and conduct the first bypass;

The second bypass unit is used to determine the DC signal according to the action and conduct the second bypass;

The input sampling unit and the output sampling unit both include two input terminals and an output terminal; the integrated operation unit includes an input comparison terminal, an output comparison terminal and an output terminal, and the judgment control unit includes an input terminal. terminal and an output terminal; the first bypass unit includes an input terminal and an output terminal, and the second bypass unit includes an input terminal and an output terminal;

One input end of the input sampling unit is connected to the input end of the first line, the other input end is connected to the input end of the second line, and the output end of the input sampling unit is connected to the input comparison of the integrated operation unit. end;

One input end of the output sampling unit is connected to the output end of the first line, the other input end is connected to the output end of the second line, and the output end of the output sampling unit is connected to the output comparison of the integrated operation unit. end;

The output end of the integrated operation unit is connected to the input end of the judgment control unit, and the output end of the judgment control unit is connected to the input end of the first bypass unit and the input end of the second bypass unit;

The output end of the first bypass unit is used to conduct the first bypass; the output end of the second bypass is used to conduct the second bypass.

By adopting the above technical solution, based on the signal sampling results at both ends of the AC charging pile, it is determined whether the sampled AC charging pile has a fault, and in the event of a fault, the sampled AC charging pile is short-circuited without affecting the normal operation of other AC charging piles. , so that production capacity can be fully utilized.

Optionally, the bypass action module also includes a fault alarm unit;

The fault alarm unit includes a detection terminal and an alarm terminal. The detection terminal is used to receive the action determination DC signal, and the alarm terminal is used to send out alarm information according to the action determination DC signal.

By adopting the above technical solution, when the sampled AC charging pile is faulty, an alarm message will be sent to remind relevant personnel, making it easier for relevant personnel to understand and replace the faulty AC charging pile.

Optionally, the input sampling unit includes a first rectification component and a first voltage stabilizing component; the output sampling unit includes a second rectification component and a second voltage stabilizing component;

The first rectifying component includes a first diode, a second diode, a third diode and a fourth diode;

The anode of the first diode is connected to the input end of the first line and the cathode of the third diode, and the cathode of the first diode is connected to the cathode of the second diode, so The anode of the second diode is connected to the cathode of the fourth diode, and the anode of the fourth diode is connected to the anode and ground of the third diode;

The second rectifying component includes a fifth diode, a sixth diode, a seventh diode and an eighth diode;

The anode of the fifth diode is connected to the input terminal of the second line and the cathode of the seventh diode, and the cathode of the fifth diode is connected to the cathode of the sixth diode, so The anode of the sixth diode is connected to the cathode of the eighth diode, and the anode of the eighth diode is connected to the anode and ground of the seventh diode;

The first voltage stabilizing component includes a first operational amplifier, a first resistor, a second resistor and a third resistor;

One end of the first resistor is connected to the cathode of the first diode and the cathode of the second diode, and the other end is connected to the positive input end of the first operational amplifier; the second resistor One end of the resistor is connected to the anode of the third diode and the anode of the fourth diode, and the other end is connected to the inverting input end of the first operational amplifier; the second resistor is connected to the first operational amplifier. The connection point of the inverting input end of the amplifier is connected to one end of the third resistor, and the other end of the third resistor is connected to the output end of the first operational amplifier;

The second voltage stabilizing component includes a second operational amplifier, a fourth resistor, a fifth resistor and a sixth resistor;

One end of the fourth resistor is connected to the cathode of the fifth diode and the cathode of the sixth diode, and the other end is connected to the positive input end of the second operational amplifier; the fifth resistor One end of the resistor is connected to the anode of the seventh diode and the anode of the eighth diode, and the other end is connected to the inverting input end of the second operational amplifier; the fifth resistor is connected to the second operational amplifier. The connection point of the inverting input terminal of the amplifier is connected to one end of the sixth resistor, and the other end of the sixth resistor is connected to the output terminal of the second operational amplifier.

By adopting the above technical solution, the input sampling unit and the output sampling unit rectify the AC signal sampled by each unit and then output a DC signal through the op amp in each unit to stabilize the voltage.

Optionally, the first voltage stabilizing component further includes a first capacitor and a seventh resistor, and the second voltage stabilizing component further includes a second capacitor and an eighth resistor;

One end of the first capacitor is connected to the connection between the second diode and the first resistor, and the other end of the first capacitor is connected to the fourth diode and the second resistor. The connection point of the device;

One end of the second capacitor is connected to the connection between the sixth diode and the fourth resistor, and the other end of the second capacitor is connected to the eighth diode and the fifth resistor. The connection point of the device;

One end of the seventh resistor is connected to the connection between the first resistor and the first operational amplifier, and the other end of the seventh resistor is connected to ground;

One end of the eighth resistor is connected to the connection between the fourth resistor and the second operational amplifier, and the other end of the eighth resistor is connected to ground.

By adopting the above technical solution, the grounding of the capacitors in the input sampling unit and the output sampling unit can filter out interference signals in the circuit, and the seventh resistor of the input sampling unit and the eighth resistor of the output sampling unit can enable the corresponding operational amplifier The non-inverting input terminal remains low when not sampled.

Optionally, the integrated computing unit includes a third operational amplifier, a ninth resistor, a tenth resistor, an eleventh resistor and a twelfth resistor;

One end of the ninth resistor is connected to the output end of the first operational amplifier, and the other end is connected to the non-inverting input end of the third operational amplifier;

The connection between the ninth resistor and the third operational amplifier is connected to one end of the eleventh resistor, and the other end of the eleventh resistor is connected to ground;

One end of the tenth resistor is connected to the output end of the second operational amplifier, and the other end is connected to the inverting input end of the third operational amplifier;

The connection point between the tenth resistor and the third operational amplifier is connected to one end of the twelfth resistor, and the other end of the twelfth resistor is connected to the output end of the third operational amplifier.

By adopting the above technical solution, a voltage difference signal is generated based on the difference between the first DC signal and the second DC signal, so that the judgment control unit can judge whether to control the bypass conduction based on the generated voltage difference signal.

Optionally, the judgment control unit includes a fourth operational amplifier, a thirteenth resistor, a fourteenth resistor and a fifteenth resistor;

The non-inverting input terminal of the fourth operational amplifier is connected to the output terminal of the third operational amplifier;

The inverting input end of the fourth operational amplifier is connected to one end of the thirteenth resistor, and the other end of the thirteenth resistor is connected to an external first DC signal source;

The output terminal of the fourth operational amplifier is respectively connected to the input terminal of the first bypass unit and the input terminal of the second bypass unit;

One end of the fourteenth resistor is connected to the connection between the thirteenth resistor and the fourth operational amplifier, and the other end of the fourteenth resistor is connected to ground;

One end of the fifteenth resistor is connected to an external second DC signal source, and the other end is connected to the output end of the fourth operational amplifier.

By adopting the above technical solution, the fourth operational amplifier compares the voltage difference signal with the preset reference voltage to generate a judgment result, and controls each unit in the bypass action module to be turned on based on the judgment result to short-circuit the sampled AC charging pile. .

Optionally, the first bypass unit includes a first triode and a first drive interface, and the second bypass unit includes a second triode and a second drive interface;

The first drive interface is used to control the first relay on the first line, and the second drive interface is used to control the second relay on the second line;

The base of the first triode is connected to the connection between the fourth operational amplifier and the fifteenth resistor, and the collector of the first triode is connected to one end of the first driving interface, The emitter of the first transistor is grounded;

The other end of the first driving interface is connected to the second DC signal source;

The base of the second triode is connected to the connection between the fourth operational amplifier and the fifteenth resistor, and the collector of the second triode is connected to one end of the second driving interface, The emitter of the second transistor is grounded;

The other end of the second driving interface is connected to the second DC signal source.

By adopting the above technical solution, according to the control signal sent by the fourth operational amplifier, the first triode in the first bypass and the second triode in the second bypass are turned on, thereby turning on the first bypass and the second triode. After the second bypass, the first bypass and the second bypass are turned on, the sampled AC charging pile can be short-circuited.

Optionally, the fault alarm unit includes a third triode, a light-emitting diode and a sixteenth resistor;

The base of the third triode is connected to the connection between the fourth operational amplifier and the fifteenth resistor, and the collector of the third triode is connected to the cathode of the light-emitting diode. The emitter of the third triode is connected to ground;

One end of the sixteenth resistor is connected to the second DC signal source, and the other end is connected to the anode of the light-emitting diode.

By adopting the above technical solution, according to the control signal output by the fourth operational amplifier, the body diode of the third triode can be turned on, thereby causing the secondary light to emit an indicator light to facilitate relevant personnel to understand the fault of the corresponding AC charging pile. So that it can be replaced in time.

Optionally, the connection points between the input end sampling point of the first line and the input end sampling point of the second line and the AC charging pile are connected to switches.

By adopting the above technical solution, when the sampled AC charging pile is short-circuited, the faulty charging pile can be replaced online by closing the control switch.

On the other hand, the present application discloses a device that includes a circuit structure of a bypass control circuit of an AC charging pile as described above.

To sum up, this application includes at least one of the following beneficial effects:

1. Based on the signal sampling results at both ends of the AC charging pile, determine whether the sampled AC charging pile has a fault, and short-circuit the sampled AC charging pile when it fails, without affecting the normal operation of other AC charging piles, thereby increasing production capacity. be fully utilized.

2. The fourth operational amplifier compares the voltage difference signal with the preset reference voltage to generate a judgment result, and outputs a control signal based on the judgment result. According to the control signal output by the fourth operational amplifier, the body diode of the third transistor can be turned on. , so that the secondary light emits an indicator light to facilitate relevant personnel to understand the failure of the corresponding AC charging pile and replace it in time.

3. After the sampled AC charging pile is short-circuited, technicians can replace the faulty AC charging pile online by turning off the switch of the corresponding AC charging pile, without affecting the operation of other AC charging piles.

Description of drawings

Figure 1 is a system connection diagram of an embodiment of the bypass control circuit of the AC charging pile of the present application;

Figure 2 is a module connection diagram of an embodiment of the bypass control circuit of the AC charging pile of the present application;

Figure 3 is a circuit schematic diagram of an embodiment of the bypass control circuit of the AC charging pile of the present application.

Detailed ways

The present application will be further described in detail below in conjunction with the accompanying drawings.

Referring to Figure 1, Figure 1 is a system connection diagram of an embodiment of the bypass control circuit of the AC charging pile of the present application, including an AC power grid and an AC power supply for power supply, a feedback load for assisting the stable operation of the power grid, and several AC charging stations. Bypass control circuits of piles and several AC charging piles of the present application.

In this embodiment, several AC charging piles are connected in series, that is, charging pile 1, charging pile 2...charging pile N are connected in series in sequence. The number of bypass control circuits of the AC charging piles disclosed in this application is the same as the number of AC charging piles. Correspondingly, a bypass control current is connected in parallel to both ends of a charging pile, that is, bypass control circuit 1 is connected in parallel to both ends of charging pile 1, bypass control circuit 2 is connected in parallel to both ends of charging pile 2...Bypass control circuit N Connect in parallel with both ends of charging pile N.

Each bypass control circuit obtains the input voltage value and the output voltage value of the parallel AC charging pile through the above connection method, and determines whether there is a fault in the parallel AC charging pile based on the input voltage value and the output voltage value. ; If the bypass control circuit determines that the AC charging pile connected in parallel is faulty, the circuit connected to both ends of the AC charging pile connected in parallel will be bypassed, so that the AC signal passing through the original charging pile is output to the At the next charging station.

Specifically, taking the fault of charging pile 2 as an example, the bypass control circuit 2 connected in parallel to both ends of charging pile 2 will conduct the bypass at both ends of charging pile 2 to charge according to the input voltage value and output voltage value of charging pile 2. Pile 2 is short-circuited, and the AC signal originally passed through charging pile 2 is changed to the bypass voltage of charging pile 2 and output to the next charging pile.

More specifically, AC charging piles usually use two lines to transmit AC signals. When obtaining the voltage value of the input end, the bypass control circuit needs to simultaneously connect the sampling point on the first line of the input end and the sampling point on the second line of the input end. point, similarly, when obtaining the voltage value of the output terminal, the bypass control circuit needs to simultaneously connect the sampling point on the first line of the output terminal and the sampling point on the second line of the input terminal.

Furthermore, when the bypass control circuit turns on the bypass, it will also send out an alarm message to remind relevant personnel that the charging pile is faulty, so that the faulty charging pile can be replaced in a timely manner. The following is a detailed description of the replacement of the faulty charging pile:

The input end sampling point of the first line and the input end sampling point of the second line are connected to the AC charging pile by a switch.

Specifically, the switch can be an air switch or other switching device. When the faulty charging pile is short-circuited by the bypass control circuit, the relevant personnel can turn off the switch of the faulty charging pile and allow other charging piles to operate normally. If the fault is affected, repair or replace the faulty charging pile. After the faulty charging pile returns to normal state, the bypass control can still judge the input and output voltages at both ends of the charging pile and turn off the bypass of this charging pile. In this case, turning the switch back on can restore the normal operation of the charging pile.

The sampling, judgment and control of the bypass control circuit of the AC charging pile in this application are all implemented by hardware. The following is a detailed description of this application in conjunction with the module connection diagram. Refer to Figure 2. Figure 2 is a bypass control circuit of the AC charging pile in this application. Module connection diagram of the embodiment, the circuit includes a voltage sampling module 1, an arithmetic processing module 2 and a bypass action module 3.

The voltage sampling module 1 includes an input sampling unit 11 and an output sampling unit 12; both the input sampling unit 11 and the output sampling unit 12 include two input terminals and one output terminal.

The input sampling unit 11 connects the input end sampling point of the first line and the input end sampling point of the second line, and is used to obtain the input pile signal and output the first DC signal according to the input pile signal; One input end of the input sampling unit 11 is connected to the input end of the first line, the other input end is connected to the input end of the second line, and the output end of the input sampling unit 11 is connected to the integrated computing unit 21 input comparison terminal.

Regarding the input sampling unit 11: the input sampling unit 11 is used to obtain the input AC signal corresponding to the AC charging pile. In this embodiment, the input AC signal corresponding to the AC charging pile is defined as voltage sampling 1. The input sampling unit 11 includes a rectifier component and a voltage stabilizing component. The rectifier component can be a full-bridge rectifier composed of multiple diodes. The voltage stabilizing component can clamp the AC signal sampled by the input sampling unit 11 through pull-up and pull-down resistors, signal filtering, etc. Convert to stable DC signal output.

The output sampling unit 12 connects the output end sampling point of the first line and the output end sampling point of the second line, and is used to obtain an output pile signal, and output a second DC signal according to the output pile signal; One input end of the output sampling unit 12 is connected to the output end of the first line, and the other input end is connected to the output end of the second line. The output end of the output sampling unit 12 is connected to the integrated operation unit 21. Output comparison terminal.

Regarding the output sampling unit 12: the output sampling unit 12 is used to obtain the output AC signal corresponding to the AC charging pile. In this embodiment, the output AC signal corresponding to the AC charging pile is defined as voltage sampling 2. The output sampling unit 12 is the same as the above-mentioned input sampling unit 11 and includes a rectifier component and a voltage stabilizing component. The rectifier component can be a full-bridge rectifier composed of multiple diodes. The voltage stabilizing component can be clamped by pull-up and pull-down resistors, signal filtering, etc., so that the output The AC signal sampled by the sampling unit 12 is converted into a stable DC signal for output.

The operation processing module 2 includes an integrated operation unit 21 and a judgment control unit 22;

The integrated operation unit 21 is configured to output a voltage difference signal according to the first DC signal and the second DC signal; the integrated operation unit 21 includes an input comparison terminal, an output comparison terminal and an output end.

Regarding the integrated operation unit 21: the integrated operation unit 21 includes an operational amplifier. The non-inverting input terminal of the operational amplifier receives the stable DC signal output by the input sampling unit 11, and the inverting input terminal receives the stable DC signal output by the output sampling unit 12. A difference operation is performed on the two DC signals to obtain a DC signal with a voltage difference that is output to the following judgment control unit 22 .

The judgment control unit 22 is configured to output an action judgment DC signal according to the voltage difference signal; the judgment control unit 22 includes an input terminal and an output terminal.

Regarding the judgment control unit 22: the judgment control unit 22 includes an operational amplifier, the inverting input end of which is set with a reference voltage value, and the reference voltage value is used to differ from the voltage output by the integrated arithmetic unit 21 received at the non-inverting input end. The resulting DC signal is judged. If the DC signal resulting from the voltage difference is higher than the preset reference voltage value, in this case, it is considered that the corresponding AC charging pile is faulty, and the operational amplifier of the judgment control unit 22 will output a high level. As a control signal, the driving of each unit in the bypass operation module 3 described below is controlled.

The bypass action module 3 includes a first bypass unit 31 and a second bypass unit 32;

The first bypass unit 31 is used to determine the DC signal according to the action and conduct the first bypass. The first bypass unit includes an input terminal and an output terminal.

Regarding the first bypass unit 31: the first bypass unit 31 includes a switching device and a driving interface, where the driving interface is used to control the line switching of the first relay on the first line in a system of AC charging piles; the switching device can It is a triode, and the base of the triggering triode is connected to the collector and emitter of the triode. It can also be a MOS tube, and the gate of the triggering MOS tube is connected to the body diode of the MOS tube. Any device that can achieve the desired function due to receiving a DC signal Devices that conduct circuits and circuits using the same inventive concept should be included in the protection scope of this application.

The second bypass unit 32 is used to determine the DC signal according to the action and conduct the second bypass unit. The second bypass unit includes an input terminal and an output terminal.

Regarding the second bypass unit 32: The second bypass unit 32 is the same as the first bypass unit 31 and includes a switching device and a drive interface. The drive interface is used to control the AC charging pile in the system. The description of the switching device for circuit switching of the second relay is the same as that of the switching device of the first bypass unit 31, and will not be described again here.

Further, the bypass action module 3 also includes a fault alarm unit 33. The fault alarm unit 33 includes a detection terminal and an alarm terminal. The detection terminal is used to receive the action determination DC signal. The alarm terminal Used to determine the DC signal according to the action and send out alarm information.

Regarding the fault alarm unit 33: the fault alarm unit 33 includes a switching device and an alarm device. The alarm device can be a device that can emit light, audio and other information, such as a light-emitting diode, a buzzer and other devices. The switching device is used to control the alarm device. The circuit where it is located is turned on, thereby achieving the function of controlling the operation of the alarm device.

Referring to Figure 3, Figure 3 is a circuit principle diagram of an embodiment of the bypass control circuit of an AC charging pile further disclosed in this application. The circuit principle of this embodiment will be described in detail below in conjunction with Figure 3:

The input sampling unit 11 includes a first rectification component and a first voltage stabilizing component; the output sampling unit 12 includes a second rectification component and a second voltage stabilizing component;

The first rectifying component includes a first diode D1, a second diode D2, a third diode D3 and a fourth diode D4; the anode of the first diode D1 is connected to the first The input end of the line and the cathode of the third diode D3, the cathode of the first diode D1 is connected to the cathode of the second diode D2, and the anode of the second diode D2 is connected to The cathode of the fourth diode D4 is connected to the cathode of the fourth diode D4, and the anode of the fourth diode D4 is connected to the anode of the third diode D3 and the ground.

Specifically, the AC signal sampled by the input end of the sampled AC charging pile (hereinafter referred to as the charging pile) needs to be rectified and converted into a DC signal before it can be input to the back-end circuit device. In this embodiment, sampling D1, D2, D3, and D4 construct a full-bridge rectifier. Assume that the forward signal in the AC signal is output from D1 to the non-inverting input terminal of the operational amplifier U1, and the inverted signal in the AC signal is output from D2 to the non-inverting input terminal of the operational amplifier U1. input terminal, thereby rectifying the AC signal into a DC signal of equal voltage value and inputting it into the operational amplifier U1.

The second rectifier component includes a fifth diode D5, a sixth diode D6, a seventh diode D7 and an eighth diode D8;

The anode of the fifth diode D5 is connected to the input terminal of the second line and the cathode of the seventh diode D7, and the cathode of the fifth diode D5 is connected to the sixth diode D6. The cathode of the sixth diode D6 is connected to the cathode of the eighth diode D8, and the anode of the eighth diode D8 is connected to the anode and ground of the seventh diode D7.

Specifically, the AC signal sampled by the output end of the charging pile also needs to be rectified and converted into an AC signal before being input to the back-end circuit device. In this embodiment, in the same way as the first rectifier component, D5, D6, D7 and D8 constructs a full-bridge rectifier, and the sampled AC signal at the output end is converted into a DC signal using the same principle as the first rectifier component mentioned above, and then input into the non-inverting input end of the operational amplifier U2.

The first voltage stabilizing component includes a first operational amplifier U1, a first resistor R1, a second resistor R2 and a third resistor R3;

One end of the first resistor R1 is connected to the cathode of the first diode D1 and the cathode of the second diode D2, and the other end is connected to the positive input end of the first operational amplifier U1; One end of the second resistor R2 is connected to the anode of the third diode D3 and the anode of the fourth diode D4, and the other end is connected to the inverting input end of the first operational amplifier U1; the second resistor R2 The connection between the resistor R2 and the inverting input end of the first operational amplifier U1 is connected to one end of the third resistor R3, and the other end of the third resistor R3 is connected to the output of the first operational amplifier U1 end.

Specifically, the operational amplifier U1 is used to integrate the DC signal formed after being rectified by the first rectifier component, and integrate it into a logic level "1" or "0" output according to the input result of the DC signal. The non-inverting input terminal of operational amplifier U1 is used to receive the integrated DC signal. The inverting input terminal is connected to resistor R2 and then grounded, forming a pull-down resistor to clamp the inverting input terminal at a low level. Resistor R3 is connected to the inverting terminal of U1. The input end and the output end form a feedback circuit to maintain the signal stability of the op amp. The resistor R1 acts as a voltage divider to prevent DC signals from being directly input into the op amp U1 and damaging the device.

More specifically, if the first rectifier component does not sample the input AC signal of the charging pile, in this case, no AC signal is integrated into a DC signal and output to the positive input terminal of U1, causing the positive input terminal of U1 to be low voltage. level "0", the inverting input terminal is low level "0", and the output of U1 is also low level "0"; if the first rectifier component samples the input AC signal of the charging pile, in this case the sampled input AC signal The signal is integrated into a DC signal and output to the positive input terminal of U1, forming a logic circuit in which the positive input terminal of U1 is a high level "1", the inverting input terminal is a low level "0", and the output is "1". Flat signal, in layman's terms, the output of U1 can be understood as the logic level value of the non-inverting input terminal minus the logic level value of the inverting input terminal, and outputs a logic level value of the operation result.

Furthermore, the signal stability of the operational amplifier U1 can be further stabilized by adding a voltage stabilizing device, as detailed below:

including a first capacitor C1 and a seventh resistor R7;

One end of the first capacitor C1 is connected to the connection between the second diode D2 and the first resistor R1, and the other end of the first capacitor C1 is connected to the connection between the fourth diode D4 and the first resistor R1. The connection point of the second resistor R2.

Specifically, the capacitor C1 is connected to the ground to form a filter circuit. In the DC signal rectified by the first rectifier component, there may be interference signals. The interference signals are output to the ground to eliminate them by virtue of the characteristics of the capacitor C1 that passes the AC resistance DC, thereby increasing the stability of the signal.

One end of the seventh resistor R7 is connected to the connection between the first resistor R1 and the first operational amplifier U1, and the other end of the seventh resistor R7 is connected to ground.

Specifically, resistor R7 acts as a pull-down resistor to clamp the non-inverting input terminal of operational amplifier U1 to a low level to further maintain signal stability.

The second voltage stabilizing component includes a second operational amplifier U2, a fourth resistor R4, a fifth resistor R5 and a sixth resistor R6;

One end of the fourth resistor R4 is connected to the cathode of the fifth diode D5 and the cathode of the sixth diode D6, and the other end is connected to the positive input end of the second operational amplifier U2; One end of the fifth resistor R5 is connected to the anode of the seventh diode D7 and the anode of the eighth diode D8, and the other end is connected to the inverting input end of the second operational amplifier U2; the fifth resistor R5 The connection between the resistor R5 and the inverting input end of the second operational amplifier U2 is connected to one end of the sixth resistor R6, and the other end of the sixth resistor R6 is connected to the output of the second operational amplifier U2. end.

Specifically, the non-inverting input terminal of the operational amplifier U2 receives the DC signal formed after the AC signal at the output terminal of the charging pile is rectified by the second rectifier component. The principle is the same as that of the first voltage stabilizing component mentioned above. In the second voltage stabilizing component, the resistor R4 is used to divide the signal input to the positive input terminal of the operational amplifier U2 to prevent direct input from damaging U2; the resistor R5 is used as a pull-down resistor. , clamping the inverting input terminal of U2 at a low level; resistor R6 connects the inverting input terminal of the operational amplifier U2 to the output terminal, forming a feedback circuit to maintain the stability of the input and output of the signal.

More specifically, in the same way as the above-mentioned first voltage stabilizing component, if the second rectifying component does not sample the input AC signal of the charging pile, in this case, no AC signal is integrated into a DC signal and output to the positive input terminal of U2. , forming that the non-inverting input terminal of U2 is low level "0", and the inverting input terminal is low level "0", then the logic level output by U2 is "0";

If the first rectifier component samples the input AC signal of the charging pile, in this case the sampled input AC signal is integrated into a DC signal and output to the positive input terminal of U2, forming the positive input terminal of U2 to be high level." 1", the inverting input terminal is low level "0", and the output is a logic level signal of "1".

Furthermore, the signal stability of the operational amplifier U2 can be further stabilized by installing a voltage stabilizing device, as detailed below:

including a second capacitor C2 and an eighth resistor R8;

One end of the second capacitor C2 is connected to the connection between the sixth diode D6 and the fourth resistor R4, and the other end of the second capacitor C2 is connected to the eighth diode D8 and the fourth resistor R4. The connection point of the fifth resistor R5.

Specifically, the capacitor C2 is connected to the ground to form a filter circuit. In the DC signal rectified by the second rectifier component, there may be interference signals. The interference signals are output to the ground to eliminate them by virtue of the characteristics of the capacitor C2 that passes through AC resistance and DC, thereby increasing the stability of the signal.

One end of the eighth resistor R8 is connected to the connection between the fourth resistor R4 and the second operational amplifier U2, and the other end of the eighth resistor R8 is connected to ground.

Specifically, resistor R8 acts as a pull-down resistor to clamp the non-inverting input terminal of operational amplifier U2 to a low level to further maintain signal stability.

After the above-mentioned first voltage stabilizing component and the second voltage stabilizing component process the sampled signals, two logic level signals are obtained. Based on the two obtained logic level signals, the signal of the charging pile is determined. In this embodiment, an integrated computing unit 21 is used for processing. The integrated processing of the integrated computing unit 21 is described in detail below: the integrated computing unit 21 includes a third operational amplifier U3, a ninth resistor R9, a tenth resistor R10, eleventh resistor R11 and twelfth resistor R12;

One end of the ninth resistor R9 is connected to the output end of the first operational amplifier U1, and the other end is connected to the non-inverting input end of the third operational amplifier U3.

Specifically, the resistor R9 is used to divide the logic level signal output by the operational amplifier U1 and then output it to the non-inverting input terminal of the operational amplifier U3 to prevent device damage caused by direct signal transmission.

The connection point between the ninth resistor R9 and the third operational amplifier U3 is connected to one end of the eleventh resistor R11, and the other end of the eleventh resistor R11 is connected to ground.

Specifically, the resistor R11 acts as a pull-down resistor to clamp the non-inverting input terminal of U3 to a low level when there is no high-level "1" output at the output terminal of the operational amplifier U1.

One end of the tenth resistor R10 is connected to the output end of the second operational amplifier U2, and the other end is connected to the inverting input end of the third operational amplifier U3.

Specifically, the resistor R10 is used to divide the logic level signal output by the operational amplifier U2 and then output it to the inverting input terminal of the operational amplifier U3 to prevent device damage caused by direct signal transmission.

More specifically, by combining the output of the above-mentioned operational amplifier U1 to the non-inverting input terminal of the operational amplifier U3, the operational amplifier U3 will perform operation determination and generate operation based on the logic level signals received by the non-inverting input terminal and the inverting input terminal. As a result, a level signal is output according to the operation result. For the convenience of explanation, the logic level signal output by U1 is called voltage sampling 1, the logic level signal output by U2 is called voltage 2, and the logic level signal output by U3 is called voltage sampling 2. The level signal is called the output and is represented by the following truth table:

Voltage sampling 1 Voltage sampling 2 output 0 0 0 1 1 0 1 0 1

Combining the above table, it can be seen that only when the logic level values of voltage sampling 1 and voltage sampling 2 are different, the operational amplifier U3 will output a voltage difference signal used to control the judgment control unit, that is, a high-level signal "1".

The connection between the tenth resistor R10 and the third operational amplifier U3 is connected to one end of the twelfth resistor R12, and the other end of the twelfth resistor R12 is connected to the third operational amplifier U3. output terminal.

Specifically, the resistor R12 connects the inverting input terminal of U3 and the output terminal of U3 through the above connection method to construct a feedback circuit and stabilize the input and output of U3.

The integrated operation unit 21 performs a difference operation on the two voltage samples and outputs a voltage difference signal, and controls the on or off of the bypass according to the voltage difference signal. In this embodiment, a judgment control unit 22 is used To perform the bypass control operation, the judgment control unit 22 will be described in detail below:

The judgment control unit 22 includes a fourth operational amplifier U4, a thirteenth resistor R13, a fourteenth resistor R14, and a fifteenth resistor R15;

The non-inverting input terminal of the fourth operational amplifier U4 is connected to the output terminal of the third operational amplifier U3;

The inverting input end of the fourth operational amplifier U4 is connected to one end of the thirteenth resistor R13, and the other end of the thirteenth resistor R13 is connected to the external first DC signal source VCC1;

The output terminal of the fourth operational amplifier U4 is respectively connected to the input terminal of the first bypass unit 31 and the input terminal of the second bypass unit 32;

One end of the fourteenth resistor R14 is connected to the connection between the thirteenth resistor R13 and the fourth operational amplifier U4, and the other end of the fourteenth resistor R14 is connected to ground.

One end of the fifteenth resistor R15 is connected to the external second DC signal source VCC2, and the other end is connected to the output end of the fourth operational amplifier U4.

Specifically, the non-inverting input terminal of the operational amplifier U4 obtains a voltage difference signal calculated by the above-mentioned integrated operation unit 21, and compares the voltage difference signal with the preset reference voltage value at the inverting input terminal of U4. , if the voltage value of the voltage difference signal is higher than the preset reference voltage value at the inverting input terminal of U4, a high level signal is output to the first bypass unit 31 and the second bypass unit 32, thereby triggering the bypass. conduction.

More specifically, resistor R13 is used to divide the DC signal input by VCC1 so that the voltage value of the inverting input terminal of U4 is at the reference voltage value. By adjusting the resistance value of R13 and/or the input voltage value of VCC1, The size of the reference voltage value can be adjusted; resistor R14 is a pull-down resistor; resistor R15 is a pull-up resistor. When the voltage of the positive input terminal of U4 is higher than the voltage of the inverted input terminal of U4, a high voltage is output through the pull-up resistor R15. level, this high level is the action determination DC signal. According to the action determination DC signal, the conduction of each unit in the bypass action module 3 can be controlled. The following is a detailed description of the first bypass unit 31 in the action determination DC signal controllable bypass action module 3:

The first bypass unit 31 includes a first transistor S1 and a first drive interface K1, and the second bypass unit includes a second transistor S2 and a second drive interface K2;

The first drive interface K1 is used to control the first relay K11 on the first line, and the second drive interface K2 is used to control the second relay K12 on the second line;

The base of the first transistor S1 is connected to the connection between the fourth operational amplifier U4 and the fifteenth resistor R15, and the collector of the first transistor S1 is connected to the first driver. At one end of the interface K1, the emitter of the first transistor S1 is grounded;

The other end of the first driving interface K1 is connected to the second DC signal source VCC2.

Specifically, when the operational amplifier U4 sends a high-level action determination DC signal, the base of the transistor S1 receives the action determination DC signal and turns on the body diode. The DC signal output by VCC2 passes through the driving interface K1 and the body diode of the transistor S1 Output to ground. Among them, the drive interface K1 controls the connection mode of the relay K11 as shown in Figure 1. If the drive interface K1 is not turned on, the relay K11 adopts the connection method of contact a connecting to the contact point b; if the drive interface K1 is turned on, the relay K11 K11 adopts the connection method of contact a connecting to contact c.

The base of the second transistor S2 is connected to the connection between the fourth operational amplifier U4 and the fifteenth resistor R15, and the collector of the second transistor S2 is connected to the second driver. One end of the interface K2, the emitter of the second transistor S2 is grounded;

The other end of the second driving interface K2 is connected to the second DC signal source VCC2.

Specifically, when the operational amplifier U4 sends a high-level action determination DC signal, the base of the transistor S2 receives the action determination DC signal and turns on the body diode. The DC signal output by VCC2 passes through the driving interface K2 and the body diode of the transistor S2 Output to ground. Among them, the drive interface K2 controls the connection mode of the relay K12 as shown in Figure 1. If the drive interface K2 is not turned on, the relay K12 adopts the connection method of contact d connected to the contact point e; if the drive interface K2 is turned on, the relay K12 K12 adopts the connection method of contact d connected to contact f.

More specifically, the connection contacts of relay K11 and relay K12 are changed simultaneously to form a signal bypass that is transmitted across the charging pile, and the corresponding charging pile is short-circuited.

Further, after the above-mentioned first bypass unit 31 and second bypass unit 32 are turned on, a conductive bypass is constructed at both ends of the charging pile, and the charging pile is short-circuited. At the same time, the fault alarm unit 33 issues a corresponding prompt. Information, thereby informing relevant personnel of the fault situation of the AC charging pile. The principle of the fault alarm unit 33 in this embodiment will be specifically described below:

The fault alarm unit includes a third transistor S3, a light-emitting diode and a sixteenth resistor R16;

The base of the third transistor S3 is connected to the connection between the fourth operational amplifier U4 and the fifteenth resistor R15, and the collector of the third transistor S3 is connected to the junction of the light-emitting diode. Negative electrode, the emitter of the third transistor S3 is grounded;

One end of the sixteenth resistor R16 is connected to the second DC signal source, and the other end is connected to the anode of the light-emitting diode.

Specifically, when the operational amplifier U4 sends a high-level action determination DC signal, the base of the transistor S3 receives the action determination DC signal and turns on the body diode. VCC2 goes to ground through the resistor R16, the photodiode and the body diode of the transistor S3. , causing the photodiode to emit an indicator light to achieve the effect of fault alarm. In this embodiment, issuing the fault alarm through an indicator light is only a possible embodiment, and other methods such as a buzzer can also be used to indicate the relevant personnel. Provide fault alarm corresponding to charging pile failure.

Furthermore, after the AC charging pile issues a corresponding alarm when it fails, relevant personnel can determine the specific charging pile that needs to be repaired or replaced based on the operation of the indicating device. In this embodiment, a switch is used to implement online maintenance. The following is about online maintenance. The principle of maintenance is explained in detail:

The connection point between the input end sampling point of the first line and the input end sampling point of the second line and the AC charging pile is connected to the switch Q1.

Specifically, when the faulty charging pile is short-circuited through the above circuit and its principle, if the charging pile is directly replaced or repaired, the contacts may cause a safety accident. The switch Q1 can be any component with the ability to control the circuit on and off. In the embodiment of this application, the switch Q1 is an air switch. By setting up the switch Q1, relevant personnel can turn off the switch Q1 when the charging pile alarms due to a fault, or when there is other need to contact the charging pile for daily maintenance, so that the electrical signal is transmitted by the bypass of the corresponding charging pile to achieve non-stop Online replacement of other AC charging pile operations.

The examples of this specific implementation mode are all preferred embodiments of the present application and do not limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application shall be covered by within the protection scope of this application.

Claims (10)

1. A bypass control circuit for an AC charging pile, characterized in that: the circuit includes a voltage sampling module, a calculation processing module and a bypass action module; The circuit is connected to an AC charging pile, and the AC charging pile includes a first line and a second line, and both the first line and the second line include an input end and an output end; the first line A first bypass is connected in parallel between the input end and the output end of the first line, and a second bypass is connected in parallel between the input end of the second line and the output end of the second line; The voltage sampling module includes an input sampling unit and an output sampling unit; The input sampling unit connects the input end sampling point of the first line and the input end sampling point of the second line to obtain the input pile signal and output the first DC signal according to the input pile signal; The output sampling unit connects the output end sampling point of the first line and the output end sampling point of the second line, and is used to obtain the output pile signal and output a second DC signal according to the output pile signal; The operation processing module includes an integrated operation unit and a judgment control unit; The integrated computing unit is configured to output a voltage difference signal according to the first DC signal and the second DC signal; The judgment control unit is used to output an action judgment DC signal according to the voltage difference signal; The bypass action module includes a first bypass unit and a second bypass unit; The first bypass unit is used to determine the DC signal according to the action and conduct the first bypass; The second bypass unit is used to determine the DC signal according to the action and conduct the second bypass; The input sampling unit and the output sampling unit both include two input terminals and an output terminal; the integrated operation unit includes an input comparison terminal, an output comparison terminal and an output terminal, and the judgment control unit includes an input terminal. terminal and an output terminal; the first bypass unit includes an input terminal and an output terminal, and the second bypass unit includes an input terminal and an output terminal; One input end of the input sampling unit is connected to the input end of the first line, the other input end is connected to the input end of the second line, and the output end of the input sampling unit is connected to the input comparison of the integrated operation unit. end; One input end of the output sampling unit is connected to the output end of the first line, the other input end is connected to the output end of the second line, and the output end of the output sampling unit is connected to the output comparison of the integrated operation unit. end; The output end of the integrated operation unit is connected to the input end of the judgment control unit, and the output end of the judgment control unit is connected to the input end of the first bypass unit and the input end of the second bypass unit; The output end of the first bypass unit is used to conduct the first bypass; the output end of the second bypass is used to conduct the second bypass. 2. The bypass control circuit of the AC charging pile according to claim 1, characterized in that: the bypass action module further includes a fault alarm unit; The fault alarm unit includes a detection terminal and an alarm terminal. The detection terminal is used to receive the action determination DC signal, and the alarm terminal is used to send out alarm information according to the action determination DC signal. 3. The bypass control circuit of the AC charging pile according to claim 2, characterized in that: the input sampling unit includes a first rectifier component and a first voltage stabilizing component; the output sampling unit includes a second rectifier component and second voltage stabilizing component; The first rectifying component includes a first diode, a second diode, a third diode and a fourth diode; The anode of the first diode is connected to the input end of the first line and the cathode of the third diode, and the cathode of the first diode is connected to the cathode of the second diode, so The anode of the second diode is connected to the cathode of the fourth diode, and the anode of the fourth diode is connected to the anode and ground of the third diode; The second rectifying component includes a fifth diode, a sixth diode, a seventh diode and an eighth diode; The anode of the fifth diode is connected to the input terminal of the second line and the cathode of the seventh diode, and the cathode of the fifth diode is connected to the cathode of the sixth diode, so The anode of the sixth diode is connected to the cathode of the eighth diode, and the anode of the eighth diode is connected to the anode and ground of the seventh diode; The first voltage stabilizing component includes a first operational amplifier, a first resistor, a second resistor and a third resistor; One end of the first resistor is connected to the cathode of the first diode and the cathode of the second diode, and the other end is connected to the positive input end of the first operational amplifier; the second resistor One end of the resistor is connected to the anode of the third diode and the anode of the fourth diode, and the other end is connected to the inverting input end of the first operational amplifier; the second resistor is connected to the first operational amplifier. The connection point of the inverting input end of the amplifier is connected to one end of the third resistor, and the other end of the third resistor is connected to the output end of the first operational amplifier; The second voltage stabilizing component includes a second operational amplifier, a fourth resistor, a fifth resistor and a sixth resistor; One end of the fourth resistor is connected to the cathode of the fifth diode and the cathode of the sixth diode, and the other end is connected to the positive input end of the second operational amplifier; the fifth resistor One end of the resistor is connected to the anode of the seventh diode and the anode of the eighth diode, and the other end is connected to the inverting input end of the second operational amplifier; the fifth resistor is connected to the second operational amplifier. The connection point of the inverting input terminal of the amplifier is connected to one end of the sixth resistor, and the other end of the sixth resistor is connected to the output terminal of the second operational amplifier. 4. The bypass control circuit of the AC charging pile according to claim 3, characterized in that: the first voltage stabilizing component further includes a first capacitor and a seventh resistor, and the second voltage stabilizing component further includes a third voltage stabilizing component. two capacitors and an eighth resistor; One end of the first capacitor is connected to the connection between the second diode and the first resistor, and the other end of the first capacitor is connected to the fourth diode and the second resistor. The connection point of the device; One end of the second capacitor is connected to the connection between the sixth diode and the fourth resistor, and the other end of the second capacitor is connected to the eighth diode and the fifth resistor. The connection point of the device; One end of the seventh resistor is connected to the connection between the first resistor and the first operational amplifier, and the other end of the seventh resistor is connected to ground; One end of the eighth resistor is connected to the connection between the fourth resistor and the second operational amplifier, and the other end of the eighth resistor is connected to ground. 5. The bypass control circuit of the AC charging pile according to claim 3, characterized in that: the integrated operation unit includes a third operational amplifier, a ninth resistor, a tenth resistor, an eleventh resistor and a third resistor. twelve resistors; One end of the ninth resistor is connected to the output end of the first operational amplifier, and the other end is connected to the non-inverting input end of the third operational amplifier; The connection between the ninth resistor and the third operational amplifier is connected to one end of the eleventh resistor, and the other end of the eleventh resistor is connected to ground; One end of the tenth resistor is connected to the output end of the second operational amplifier, and the other end is connected to the inverting input end of the third operational amplifier; The connection point between the tenth resistor and the third operational amplifier is connected to one end of the twelfth resistor, and the other end of the twelfth resistor is connected to the output end of the third operational amplifier. 6. The bypass control circuit of the AC charging pile according to claim 5, characterized in that: the judgment control unit includes a fourth operational amplifier, a thirteenth resistor, a fourteenth resistor and a fifteenth resistor. ; The non-inverting input terminal of the fourth operational amplifier is connected to the output terminal of the third operational amplifier; The inverting input end of the fourth operational amplifier is connected to one end of the thirteenth resistor, and the other end of the thirteenth resistor is connected to an external first DC signal source; The output terminal of the fourth operational amplifier is respectively connected to the input terminal of the first bypass unit and the input terminal of the second bypass unit; One end of the fourteenth resistor is connected to the connection between the thirteenth resistor and the fourth operational amplifier, and the other end of the fourteenth resistor is connected to ground; One end of the fifteenth resistor is connected to an external second DC signal source, and the other end is connected to the output end of the fourth operational amplifier. 7. The bypass control circuit of the AC charging pile according to claim 6, characterized in that: the first bypass unit includes a first transistor and a first drive interface, and the second bypass unit includes a first Two transistors and second driver interface; The first drive interface is used to control the first relay on the first line, and the second drive interface is used to control the second relay on the second line; The base of the first triode is connected to the connection between the fourth operational amplifier and the fifteenth resistor, and the collector of the first triode is connected to one end of the first driving interface, The emitter of the first transistor is grounded; The other end of the first driving interface is connected to the second DC signal source; The base of the second triode is connected to the connection between the fourth operational amplifier and the fifteenth resistor, and the collector of the second triode is connected to one end of the second driving interface, The emitter of the second transistor is grounded; The other end of the second driving interface is connected to the second DC signal source. 8. The bypass control circuit of the AC charging pile according to claim 6, characterized in that: the fault alarm unit includes a third triode, a light-emitting diode and a sixteenth resistor; The base of the third triode is connected to the connection between the fourth operational amplifier and the fifteenth resistor, and the collector of the third triode is connected to the cathode of the light-emitting diode. The emitter of the third triode is connected to ground; One end of the sixteenth resistor is connected to the second DC signal source, and the other end is connected to the anode of the light-emitting diode. 9. The bypass control circuit of the AC charging pile according to claim 1, characterized in that: the input end sampling point of the first line and the input end sampling point of the second line are different from the AC charging pile. At the connection point, connect the switch. 10. A device, characterized by including the circuit structure of the bypass control circuit of the AC charging pile according to any one of claims 1-9.