A bypass control circuit and device for an AC charging pile

Abstract

The present application relates to the field of charging pile control, and in particular to a bypass control circuit and device for an AC charging pile, wherein the circuit includes a voltage sampling module, an operation processing module, and a bypass action module, wherein the voltage sampling module is used to obtain an input pile signal and an output pile signal, and output a first DC signal according to the input pile signal, and output a second DC signal according to the output pile signal; the operation processing module is used to output an action determination DC signal according to the first DC signal and the second DC signal; the bypass action module is used to control the bypass conduction of the charging pile according to the action determination DC signal. The present application has the beneficial effect of making full use of the production capacity of the AC charging pile and reducing the waste of production capacity of the AC charging pile due to failure.

Description

Technical Field

[0001] The present application relates to the field of charging pile control, and in particular to a bypass control circuit and device for an AC charging pile. Background Art

[0002] 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, the AC charging piles connected in series may be shut down and locked due to a power failure of a certain AC charging pile, which may cause the subsequent AC charging piles to be judged as AC input failure. This will cause the charging piles before the faulty charging pile to be disconnected without load, and the subsequent AC charging piles will be disconnected from the input AC for a long time, seriously affecting the production capacity. Therefore, how to make full use of the production capacity of AC charging piles and reduce the waste of production capacity of AC charging piles due to failures is a technical problem that needs to be solved urgently. Summary of the invention

[0003] The purpose of this application is to fully utilize the production capacity of AC charging piles and reduce the production capacity wasted due to failures of AC charging piles.

[0004] The above technical objectives of this application are achieved through the following technical solutions:

[0005] A bypass control circuit for an AC charging pile, the circuit comprising a voltage sampling module, an operation processing module and a bypass action module;

[0006] The circuit is connected to an AC charging pile, the AC charging pile includes a first circuit and a second circuit, the first circuit and the second circuit each include an input end and an output end; a first bypass is connected in parallel between the input end of the first circuit and the output end of the first circuit, and a second bypass is connected in parallel between the input end of the second circuit and the output end of the second circuit;

[0007] The voltage sampling module includes an input sampling unit and an output sampling unit;

[0008] The input sampling unit is connected to the input end sampling point of the first line and the input end sampling point of the second line, and is used to obtain an input pile signal and output a first DC signal according to the input pile signal;

[0009] The output sampling unit is connected to the output end sampling point of the first circuit and the output end sampling point of the second circuit, and is used to obtain an output pile signal, and output a second DC signal according to the output pile signal;

[0010] The operation processing module includes an integrated operation unit and a judgment control unit;

[0011] 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;

[0012] The bypass action module includes a first bypass unit and a second bypass unit;

[0013] The first bypass unit is used to conduct the first bypass according to the action determination DC signal;

[0014] The second bypass unit is used to conduct the second bypass according to the action determination DC signal;

[0015] The input sampling unit and the output sampling unit each include two input terminals and one 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 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;

[0016] One input end of the input sampling unit is connected to the input end of the first circuit, the other input end is connected to the input end of the second circuit, and the output end of the input sampling unit is connected to the input comparison end of the integration operation unit;

[0017] One input end of the output sampling unit is connected to the output end of the first circuit, the other input end is connected to the output end of the second circuit, and the output end of the output sampling unit is connected to the output comparison end of the integration operation unit;

[0018] 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;

[0019] 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.

[0020] By adopting the above technical solution, it is determined whether the sampled AC charging pile has a fault based on the signal sampling results at both ends of the AC charging pile, and the sampled AC charging pile is short-circuited when a fault occurs, without affecting the normal operation of other AC charging piles, thereby making full use of the production capacity.

[0021] Optionally, the bypass action module further includes a fault alarm unit;

[0022] The fault alarm unit includes a detection end and an alarm end, the detection end is used to receive the action determination DC signal, and the alarm end is used to issue an alarm message according to the action determination DC signal.

[0023] By adopting the above technical solution, when the sampled AC charging pile has a fault, an alarm message is issued to prompt relevant personnel, so that the relevant personnel can understand and replace the faulty AC charging pile.

[0024] Optionally, the input sampling unit includes a first rectifying component and a first voltage stabilizing component; the output sampling unit includes a second rectifying component and a second voltage stabilizing component;

[0025] The first rectifying component includes a first diode, a second diode, a third diode and a fourth diode;

[0026] The anode of the first diode is connected to the input end of the first line and the cathode of the third diode, the cathode of the first diode is connected to the cathode of the second diode, 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 of the third diode and the ground;

[0027] The second rectifying component includes a fifth diode, a sixth diode, a seventh diode and an eighth diode;

[0028] The anode of the fifth diode is connected to the input end of the second line and the cathode of the seventh diode, the cathode of the fifth diode is connected to the cathode of the sixth diode, 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 of the seventh diode and the ground;

[0029] The first voltage stabilizing component includes a first operational amplifier, a first resistor, a second resistor and a third resistor;

[0030] 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 non-inverting input terminal of the first operational amplifier; one end of the second 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 terminal of the first operational amplifier; the connection point between the second resistor and the inverting input terminal of the first operational amplifier is connected to one end of the third resistor, and the other end of the third resistor is connected to the output terminal of the first operational amplifier;

[0031] The second voltage stabilizing component includes a second operational amplifier, a fourth resistor, a fifth resistor and a sixth resistor;

[0032] 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 non-inverting input of the second operational amplifier; one end of the fifth 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 of the second operational amplifier; the connection between the fifth resistor and the inverting input of the second operational amplifier is connected to one end of the sixth resistor, and the other end of the sixth resistor is connected to the output of the second operational amplifier.

[0033] 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 after voltage stabilization by the operational amplifier in each unit.

[0034] 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;

[0035] One end of the first capacitor is connected to a connection point between the second diode and the first resistor, and the other end of the first capacitor is connected to a connection point between the fourth diode and the second resistor;

[0036] One end of the second capacitor is connected to a connection point between the sixth diode and the fourth resistor, and the other end of the second capacitor is connected to a connection point between the eighth diode and the fifth resistor;

[0037] One end of the seventh resistor is connected to the connection point of the first resistor and the first operational amplifier, and the other end of the seventh resistor is grounded;

[0038] One end of the eighth resistor is connected to a connection point between the fourth resistor and the second operational amplifier, and the other end of the eighth resistor is grounded.

[0039] By adopting the above technical solution, the capacitors in the input sampling unit and the output sampling unit are grounded to filter out interference signals in the circuit, while the seventh resistor of the input sampling unit and the eighth resistor of the output sampling unit can keep the non-inverting input terminal of the corresponding operational amplifier at a low level when not sampling.

[0040] Optionally, the integrated operation unit includes a third operational amplifier, a ninth resistor, a tenth resistor, an eleventh resistor and a twelfth resistor;

[0041] 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;

[0042] A connection point 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 grounded;

[0043] 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;

[0044] 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.

[0045] By adopting the above technical solution, a voltage difference signal is generated according to 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 to be turned on according to the generated voltage difference signal.

[0046] Optionally, the determination control unit includes a fourth operational amplifier, a thirteenth resistor, a fourteenth resistor and a fifteenth resistor;

[0047] The non-inverting input terminal of the fourth operational amplifier is connected to the output terminal of the third operational amplifier;

[0048] The inverting input terminal 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;

[0049] The output end of the fourth operational amplifier is connected to the input end of the first bypass unit and the input end of the second bypass unit respectively;

[0050] One end of the fourteenth resistor is connected to the connection point of the thirteenth resistor and the fourth operational amplifier, and the other end of the fourteenth resistor is grounded;

[0051] 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.

[0052] 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 the conduction of each unit in the bypass action module according to the judgment result to short-circuit the sampled AC charging pile.

[0053] Optionally, the first bypass unit includes a first triode and a first driving interface, and the second bypass unit includes a second triode and a second driving interface;

[0054] 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;

[0055] The base of the first transistor is connected to the connection point between the fourth operational amplifier and the fifteenth resistor, the collector of the first transistor is connected to one end of the first driving interface, and the emitter of the first transistor is grounded;

[0056] The other end of the first driving interface is connected to the second DC signal source;

[0057] The base of the second triode is connected to the connection point between the fourth operational amplifier and the fifteenth resistor, the collector of the second triode is connected to one end of the second driving interface, and the emitter of the second triode is grounded;

[0058] The other end of the second driving interface is connected to the second DC signal source.

[0059] By adopting the above technical solution, according to the control signal sent by the fourth operational amplifier, the first transistor in the first bypass and the second transistor in the second bypass are turned on, thereby turning on the first bypass and the second bypass. After the first bypass and the second bypass are turned on, the sampled AC charging pile can be short-circuited.

[0060] Optionally, the fault alarm unit includes a third triode, a light emitting diode and a sixteenth resistor;

[0061] The base of the third triode is connected to the connection point between the fourth operational amplifier and the fifteenth resistor, the collector of the third triode is connected to the cathode of the light emitting diode, and the emitter of the third triode is grounded;

[0062] 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.

[0063] By adopting the above technical solution, 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 second light emitting diode emits an indicator light, which makes it easier for relevant personnel to understand the corresponding AC charging pile failure and replace it in time.

[0064] Optionally, a switch is connected at a connection point between an input end sampling point of the first circuit and an input end sampling point of the second circuit and the connection point of the AC charging pile.

[0065] By adopting the above technical solution, when the sampled AC charging pile is short-circuited, the faulty charging pile can be replaced online by controlling the switch to be closed.

[0066] On the other hand, the present application discloses a device, which includes a circuit structure of a bypass control circuit of the AC charging pile as described above.

[0067] In summary, the present application includes at least one of the following beneficial effects:

[0068] 1. According to 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 a fault occurs, without affecting the normal operation of other AC charging piles, so that the production capacity can be fully utilized.

[0069] 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 according to 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 light-emitting diode emits an indicator light, which is convenient for relevant personnel to understand the corresponding AC charging pile failure and replace it in time.

[0070] 3. After the sampled AC charging pile is short-circuited, the technician 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. BRIEF DESCRIPTION OF THE DRAWINGS

[0071] Figure 1 It is a system connection diagram of an embodiment of the bypass control circuit of the AC charging pile of the present application;

[0072] Figure 2 It is a module connection diagram of an embodiment of the bypass control circuit of the AC charging pile of the present application;

[0073] Figure 3 It is a circuit schematic diagram of an embodiment of a bypass control circuit of an AC charging pile of the present application. DETAILED DESCRIPTION

[0074] The present application is further described in detail below in conjunction with the accompanying drawings.

[0075] Reference Figure 1 , Figure 1 It 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, a plurality of AC charging piles and a plurality of bypass control circuits of the AC charging piles of the present application.

[0076] 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 corresponds one to one to the number of AC charging piles. One 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 is connected in parallel to both ends of charging pile N.

[0077] Through the above-mentioned connection method, each bypass control circuit obtains the input terminal voltage value and the output terminal voltage value of the parallel AC charging pile, and determines whether the parallel AC charging pile has a fault based on the input terminal voltage value and the output terminal voltage value; if the bypass control circuit determines that the parallel AC charging pile has a fault, the circuit bypass at both ends of the parallel AC charging pile is turned on, so that the AC signal passing through the original charging pile is output to the next charging pile through the turned-on bypass.

[0078] Specifically, taking the failure of charging pile 2 as an example, the bypass control circuit 2 connected in parallel at both ends of the charging pile 2 will turn on the bypass at both ends of the charging pile 2 to short-circuit the charging pile 2 according to the input voltage value and the output voltage value of the charging pile 2. The original AC signal passing through the charging pile 2 is changed to be output to the next charging pile through the bypass voltage of the charging pile 2.

[0079] More specifically, an AC charging pile usually uses two lines to transmit AC signals. When obtaining the input voltage value, 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. Similarly, when obtaining the output voltage value, the bypass control circuit needs to simultaneously connect the sampling point on the first line of the output end and the sampling point on the second line of the input end.

[0080] Furthermore, when the bypass control circuit is conducting the bypass, it will also issue an alarm message to remind relevant personnel of the corresponding charging pile failure, so as to replace the faulty charging pile in time. The replacement of the faulty charging pile is specifically described below:

[0081] A switch is connected at 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.

[0082] Specifically, the switch can be an air switch or other switch devices. When the faulty charging pile is short-circuited by the bypass control circuit, relevant personnel can repair or replace the faulty charging pile without affecting the normal operation of other charging piles after turning off the switch of the faulty charging pile. After the faulty charging pile returns to normal, the bypass control can still turn off the bypass of this charging pile by judging the input and output voltages at both ends of the charging pile. In this case, the normal operation of the charging pile can be restored by turning on the switch again.

[0083] The sampling, judgment and control of the bypass control circuit of the AC charging pile of this application are all realized by hardware. The following is a specific description of this application in conjunction with the module connection diagram. Figure 2 , Figure 2 It is a module connection diagram of an embodiment of a bypass control circuit of an AC charging pile of the present application, wherein the circuit includes a voltage sampling module 1, an operation processing module 2 and a bypass action module 3.

[0084] The voltage sampling module 1 includes an input sampling unit 11 and an output sampling unit 12 ; the input sampling unit 11 and the output sampling unit 12 each include two input terminals and one output terminal.

[0085] The input sampling unit 11 is connected to the input sampling point of the first line and the input 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, and 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 input comparison end of the integration operation unit 21.

[0086] About the input sampling unit 11: The input sampling unit 11 is used to obtain the AC signal at the input end of the corresponding AC charging pile. In this embodiment, the AC signal at the input end of the corresponding 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 convert the AC signal sampled by the input sampling unit 11 into a stable DC signal output by clamping the pull-up and pull-down resistors, signal filtering, etc.

[0087] The output sampling unit 12 is connected to the output sampling point of the first circuit and the output sampling point of the second circuit, 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 circuit, and the other input end is connected to the output end of the second circuit, and the output end of the output sampling unit 12 is connected to the output comparison end of the integrated operation unit 21.

[0088] About the output sampling unit 12: The output sampling unit 12 is used to obtain the AC signal at the output end of the corresponding AC charging pile. In this embodiment, the AC signal at the output end of the corresponding 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, including 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 convert the AC signal sampled by the output sampling unit 12 into a stable DC signal output by clamping the pull-up and pull-down resistors, signal filtering, etc.

[0089] The operation processing module 2 includes an integrated operation unit 21 and a judgment control unit 22;

[0090] The integrated operation unit 21 is used 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 terminal.

[0091] About the integrated operation unit 21: The integrated operation unit 21 includes an operational amplifier, whose non-phase input terminal receives the stable DC signal output by the input sampling unit 11, and whose inverting input terminal receives the stable DC signal output by the output sampling unit 12, and performs a difference operation on these two DC signals to obtain a DC signal of a voltage difference, which is output to the following judgment control unit 22.

[0092] The judgment control unit 22 is used 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.

[0093] About the judgment control unit 22: The judgment control unit 22 includes an operational amplifier, whose inverting input terminal is provided with a reference voltage value, and the reference voltage value is used to judge the DC signal of the voltage difference result output by the integration operation unit 21 received at the non-phase input terminal. If the DC signal of the voltage difference result 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 to control the drive of each unit in the bypass action module 3 described below.

[0094] The bypass action module 3 includes a first bypass unit 31 and a second bypass unit 32;

[0095] The first bypass unit 31 is used to turn on the first bypass according to the action determination DC signal. The first bypass unit includes an input end and an output end.

[0096] Regarding the first bypass unit 31: The first bypass unit 31 includes a switching device and a driving interface, wherein the driving interface is used to control the line switching of the first relay on the first line in the system of the AC charging pile; the switching device can be a transistor, which turns on the collector and emitter of the transistor by triggering the base of the transistor, or it can be a MOS tube, which turns on the body diode of the MOS tube by triggering the gate of the MOS tube. Any device that can turn on the line due to receiving a DC signal and a circuit using the same inventive concept should be included in the protection scope of this application.

[0097] The second bypass unit 32 is used to conduct the second bypass according to the action determination DC signal. The second bypass unit includes an input end and an output end.

[0098] Regarding the second bypass unit 32: The second bypass unit 32 is similar to the first bypass unit 31, including a switching device and a drive interface, wherein the drive interface is used to control the line switching of the second relay on the second line in the system of the AC charging pile. The description of the switching device is the same as that of the first bypass unit 31, and will not be repeated here.

[0099] Furthermore, the bypass action module 3 also includes a fault alarm unit 33, and the fault alarm unit 33 includes a detection end and an alarm end, the detection end is used to receive the action determination DC signal, and the alarm end is used to issue an alarm message according to the action determination DC signal.

[0100] About the fault alarm unit 33: The fault alarm unit 33 includes a switching device and an alarm device, wherein 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, and the switching device is used to control the conduction of the circuit where the alarm device is located, thereby achieving the function of controlling the operation of the alarm device.

[0101] Reference Figure 3 , Figure 3 This is a circuit diagram of an embodiment of a bypass control circuit of an AC charging pile further disclosed in this application. Figure 3 The circuit principle of this embodiment is specifically described:

[0102] The input sampling unit 11 includes a first rectifying component and a first voltage stabilizing component; the output sampling unit 12 includes a second rectifying component and a second voltage stabilizing component;

[0103] The first rectifier 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 input end of the first circuit 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, the anode of the second diode D2 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.

[0104] 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 into the back-end circuit device. In this embodiment, sampling D1, D2 and D3, D4 construct a full-bridge rectifier. Assuming that the forward signal in the AC signal is output by D1 to the non-phase input end of the operational amplifier U1, the reverse signal in the AC signal is output by D2 to the non-phase input end of the operational amplifier U1, thereby rectifying the AC signal into a DC signal of equal voltage value and inputting it into the operational amplifier U1.

[0105] The second rectifying component includes a fifth diode D5, a sixth diode D6, a seventh diode D7 and an eighth diode D8;

[0106] The anode of the fifth diode D5 is connected to the input end of the second line and the cathode of the seventh diode D7, the cathode of the fifth diode D5 is connected to the cathode of the sixth diode D6, the anode 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 of the seventh diode D7 and the ground.

[0107] 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 into the circuit devices at the back end. In this embodiment, similar to the first rectifier component, sampling D5, D6, D7 and D8 construct a full-bridge rectifier. The sampling is based on the same principle as the above-mentioned first rectifier component to convert the sampled AC signal at the output end into a DC signal and then input into the non-phase input end of the operational amplifier U2.

[0108] The first voltage stabilizing component includes a first operational amplifier U1, a first resistor R1, a second resistor R2 and a third resistor R3;

[0109] 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 non-inverting input 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 of the first operational amplifier U1; the connection between the second resistor R2 and the inverting input 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.

[0110] Specifically, the operational amplifier U1 is used to integrate the DC signal formed after rectification by the first rectifying 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 the operational amplifier U1 is used to receive the integrated DC signal, and the inverting input terminal is connected to the resistor R2 and then grounded to form a pull-down resistor to clamp the inverting input terminal at a low level. The resistor R3 connects the inverting input terminal and the output terminal of U1 to form a feedback circuit to maintain the signal stability of the operational amplifier. The resistor R1 acts as a voltage divider to prevent the DC signal from directly inputting the operational amplifier U1 and damaging the device.

[0111] 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, forming a low level "0" at the positive input terminal of U1, a low level "0" at the inverting input terminal, and a low level "0" at the output of U1; 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 U1, forming a high level "1" at the positive input terminal of U1, a low level "0" at the inverting input terminal, and an output of a logic level signal of "1". In layman's terms, the output of U1 can be understood as the logic level value of the positive input terminal minus the logic level value of the inverting input terminal, and a logic level value of the operation result is output.

[0112] Furthermore, the signal stability of the operational amplifier U1 can be further stabilized by adding a voltage stabilizing device, as described below:

[0113] comprising a first capacitor C1 and a seventh resistor R7;

[0114] One end of the first capacitor C1 is connected to a connection point between the second diode D2 and the first resistor R1 , and the other end of the first capacitor C1 is connected to a connection point between the fourth diode D4 and the second resistor R2 .

[0115] Specifically, the capacitor C1 is grounded to form a filter loop. There may be interference signals in the DC signal rectified by the first rectifier component. The interference signals are output to the ground and eliminated by virtue of the characteristic of the capacitor C1 that it passes AC and blocks DC, thereby increasing the stability of the signal.

[0116] One end of the seventh resistor R7 is connected to a connection point between the first resistor R1 and the first operational amplifier U1 , and the other end of the seventh resistor R7 is grounded.

[0117] Specifically, the resistor R7 serves as a pull-down resistor to clamp the non-inverting input terminal of the operational amplifier U1 at a low level, further maintaining signal stability.

[0118] The second voltage stabilizing component includes a second operational amplifier U2, a fourth resistor R4, a fifth resistor R5 and a sixth resistor R6;

[0119] 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 non-inverting input 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 of the second operational amplifier U2; the connection between the fifth resistor R5 and the inverting input 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.

[0120] Specifically, the positive input terminal of the operational amplifier U2 receives a 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 to clamp the inverting input terminal of U2 at a low level; the resistor R6 connects the inverting input terminal of the operational amplifier U2 to the output terminal to form a feedback circuit to maintain the input and output stability of the signal.

[0121] More specifically, similar to the first voltage stabilizing component described above, if the second 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 U2, forming a low level "0" at the positive input terminal of U2 and a low level "0" at the negative input terminal, then the logic level output by U2 is "0";

[0122] 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 a logic level signal in which the positive input terminal of U2 is a high level "1", the inverting input terminal is a low level "0", and the output is a "1" logic level signal.

[0123] Furthermore, the signal stability of the operational amplifier U2 can be further stabilized by adding a voltage stabilizing device, as described in detail below:

[0124] comprising a second capacitor C2 and an eighth resistor R8;

[0125] One end of the second capacitor C2 is connected to a connection point between the sixth diode D6 and the fourth resistor R4, and the other end of the second capacitor C2 is connected to a connection point between the eighth diode D8 and the fifth resistor R5.

[0126] Specifically, the capacitor C2 is grounded to form a filter loop. There may be interference signals in the DC signal rectified by the second rectifier component. The interference signals are output to the ground and eliminated by virtue of the characteristic of the capacitor C2 that it passes AC and blocks DC, thereby increasing the stability of the signal.

[0127] One end of the eighth resistor R8 is connected to a connection point between the fourth resistor R4 and the second operational amplifier U2, and the other end of the eighth resistor R8 is grounded.

[0128] Specifically, the resistor R8 serves as a pull-down resistor to clamp the non-inverting input terminal of the operational amplifier U2 at a low level, further maintaining signal stability.

[0129] After the sampled signal is processed by the first voltage stabilizing component and the second voltage stabilizing component, two logic level signals are obtained. According to the obtained two logic level signals, the signal of the charging pile is determined. In this embodiment, an integrated operation unit 21 is used for processing. The integrated operation unit 21 is specifically described below: the integrated operation unit 21 includes a third operational amplifier U3, a ninth resistor R9, a tenth resistor R10, an eleventh resistor R11 and a twelfth resistor R12;

[0130] 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 .

[0131] Specifically, the resistor R9 is used to divide the logic level signal output by the operational amplifier U1 and output it to the non-inverting input terminal of the operational amplifier U3 to prevent device damage caused by direct signal transmission.

[0132] A 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 grounded.

[0133] Specifically, the resistor R11 serves as a pull-down resistor, and when there is no high-level "1" output at the output terminal of the operational amplifier U1, the non-inverting input terminal of U3 is clamped at a low-level state.

[0134] One end of the tenth resistor R10 is connected to the output end of the second operational amplifier U2 , and the other end of the tenth resistor R10 is connected to the inverting input end of the third operational amplifier U3 .

[0135] Specifically, the resistor R10 is used to divide the logic level signal output by the operational amplifier U2 and output it to the inverting input terminal of the operational amplifier U3 to prevent device damage caused by direct signal transmission.

[0136] More specifically, in conjunction with the above-mentioned operational amplifier U1 output to the non-inverting input terminal of the operational amplifier U3, the operational amplifier U3 will perform calculations and generate calculation results based on the logic level signals received at the non-inverting input terminal and the inverting input terminal, and output a level signal based on the calculation 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 sampling 2, and the level signal calculated and output by U3 is called output, and is represented by the following truth table:

[0137] Voltage sampling 1 Voltage sampling 2 Output 0 0 0 1 1 0 1 0 1

[0138] It can be seen from the above table that only when the logic level values ​​of voltage sampling 1 and voltage sampling 2 are not equal, the operational amplifier U3 will output a voltage difference signal for controlling the judgment control unit, that is, a high level signal "1".

[0139] The connection point 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 output end of the third operational amplifier U3 .

[0140] Specifically, the resistor R12 connects the inverting input terminal of U3 and the output terminal of U3 through the above connection method, constructs a feedback circuit, and stabilizes the input and output of U3.

[0141] The integrated operation unit 21 performs a difference operation on the two voltage samples and outputs a voltage difference signal, and controls the conduction or disconnection 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 is specifically described below:

[0142] The determination control unit 22 includes a fourth operational amplifier U4, a thirteenth resistor R13, a fourteenth resistor R14 and a fifteenth resistor R15;

[0143] The non-inverting input terminal of the fourth operational amplifier U4 is connected to the output terminal of the third operational amplifier U3;

[0144] The inverting input terminal 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;

[0145] The output end of the fourth operational amplifier U4 is connected to the input end of the first bypass unit 31 and the input end of the second bypass unit 32 respectively;

[0146] One end of the fourteenth resistor R14 is connected to a connection point between the thirteenth resistor R13 and the fourth operational amplifier U4, and the other end of the fourteenth resistor R14 is grounded.

[0147] 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.

[0148] Specifically, the non-inverting input terminal of the operational amplifier U4 obtains a voltage difference signal obtained by the above-mentioned integrated operation unit 21, and compares the voltage difference signal with the reference voltage value preset at the inverting input terminal of U4. If the voltage value of the voltage difference signal is higher than the reference voltage value preset 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 conduction of the bypass.

[0149] 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. The reference voltage value can be adjusted by adjusting the resistance value of R13 and / or the input voltage value of VCC1; 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 inverting input terminal of U4, a high level is output through the pull-up resistor R15. 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 first bypass unit 31 in the bypass action module 3 that can be controlled by the action determination DC signal is specifically described below:

[0150] The first bypass unit 31 includes a first transistor S1 and a first driving interface K1, and the second bypass unit includes a second transistor S2 and a second driving interface K2;

[0151] 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;

[0152] The base of the first transistor S1 is connected to the connection point between the fourth operational amplifier U4 and the fifteenth resistor R15, the collector of the first transistor S1 is connected to one end of the first driving interface K1, and the emitter of the first transistor S1 is grounded;

[0153] The other end of the first driving interface K1 is connected to the second DC signal source VCC2.

[0154] 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, and the DC signal output by VCC2 is output to the ground through the drive interface K1 and the body diode of the transistor S1. Figure 1 The connection mode of the relay K11 shown is that if the drive interface K1 is not conducting, the relay K11 adopts the connection mode of connecting the contact a to the contact b; if the drive interface K1 is conducting, the relay K11 adopts the connection mode of connecting the contact a to the contact c.

[0155] The base of the second transistor S2 is connected to the connection point between the fourth operational amplifier U4 and the fifteenth resistor R15, the collector of the second transistor S2 is connected to one end of the second driving interface K2, and the emitter of the second transistor S2 is grounded;

[0156] The other end of the second driving interface K2 is connected to the second DC signal source VCC2.

[0157] 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, and the DC signal output by VCC2 is output to the ground through the drive interface K2 and the body diode of the transistor S2. Figure 1 The connection mode of the relay K12 shown is that if the drive interface K2 is not turned on, the relay K12 adopts the connection mode of connecting the contact d to the contact e; if the drive interface K2 is turned on, the relay K12 adopts the connection mode of connecting the contact d to the contact f.

[0158] More specifically, by simultaneously changing the connection contacts through relay K11 and relay K12, a signal bypass is formed that is transmitted across the charging pile, and the corresponding charging pile is short-circuited.

[0159] Furthermore, after the first bypass unit 31 and the second bypass unit 32 are turned on, a bypass is constructed at both ends of the charging pile to short-circuit the charging pile. At the same time, the fault alarm unit 33 sends a corresponding prompt message to inform relevant personnel of the fault of the AC charging pile. The principle of the fault alarm unit 33 in this embodiment is specifically described below:

[0160] The fault alarm unit includes a third transistor S3, a light emitting diode and a sixteenth resistor R16;

[0161] The base of the third transistor S3 is connected to the connection point between the fourth operational amplifier U4 and the fifteenth resistor R15, the collector of the third transistor S3 is connected to the cathode of the light emitting diode, and the emitter of the third transistor S3 is grounded;

[0162] 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.

[0163] 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, and VCC2 reaches the ground through the resistor R16, the photodiode and the body diode of the transistor S3, so that the photodiode emits an indicator light to achieve the effect of a fault alarm. In this embodiment, the fault alarm is issued in the form of an indicator light, which is only a possible embodiment. A fault alarm can also be issued in other ways such as a buzzer to indicate the relevant personnel to the corresponding charging pile fault.

[0164] Furthermore, after the AC charging pile issues a corresponding alarm when a fault occurs, relevant personnel can determine the specific charging pile that needs to be repaired or replaced according to the operation of the indicating device. In this embodiment, a switch is used to implement online maintenance. The principle of online maintenance is specifically described below:

[0165] A switch Q1 is connected at 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.

[0166] Specifically, when the faulty charging pile is short-circuited through the above circuit and its principle, if the charging pile is directly replaced for repair or replacement, the contact may cause a safety accident. The switch Q1 can be any component that can control the on-off of the circuit. In the embodiment of the present application, the switch Q1 is an air switch. By setting up the switch Q1, relevant personnel can open and close the switch Q1 when the charging pile alarms due to a fault, or when the charging pile needs to be contacted for other reasons such as daily maintenance, so that the electrical signal is transmitted by the bypass of the corresponding charging pile, and the online replacement without stopping the operation of other AC charging piles can be realized.

[0167] The embodiments of this specific implementation method are all preferred embodiments of the present application, and are not intended to limit the protection scope of the present application. Therefore, all equivalent changes made based on the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A bypass control circuit for an AC charging pile, characterized in that: The circuit includes a voltage sampling module, an operation processing module and a bypass action module; The circuit is connected to an AC charging pile, the AC charging pile includes a first circuit and a second circuit, the first circuit and the second circuit each include an input end and an output end; a first bypass is connected in parallel between the input end of the first circuit and the output end of the first circuit, and a second bypass is connected in parallel between the input end of the second circuit and the output end of the second circuit; The voltage sampling module includes an input sampling unit and an output sampling unit; The input sampling unit is connected to the input end sampling point of the first line and the input end sampling point of the second line, and is used to obtain an input pile signal and output a first DC signal according to the input pile signal; The output sampling unit is connected to the output end sampling point of the first circuit and the output end sampling point of the second circuit, and is used to obtain an 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; The bypass action module includes a first bypass unit and a second bypass unit; The first bypass unit is used to conduct the first bypass according to the action determination DC signal; The second bypass unit is used to conduct the second bypass according to the action determination DC signal; The input sampling unit and the output sampling unit each include two input terminals and one 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 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 circuit, the other input end is connected to the input end of the second circuit, and the output end of the input sampling unit is connected to the input comparison end of the integration operation unit; One input end of the output sampling unit is connected to the output end of the first circuit, the other input end is connected to the output end of the second circuit, and the output end of the output sampling unit is connected to the output comparison end of the integration operation unit; 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 also includes a fault alarm unit; The fault alarm unit includes a detection end and an alarm end, the detection end is used to receive the action determination DC signal, and the alarm end is used to issue an alarm message 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 rectifying component and a first voltage stabilizing component; the output sampling unit includes a second rectifying 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, the cathode of the first diode is connected to the cathode of the second diode, 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 of the third diode and the ground; 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 end of the second line and the cathode of the seventh diode, the cathode of the fifth diode is connected to the cathode of the sixth diode, 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 of the seventh diode and the ground; 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 non-inverting input terminal of the first operational amplifier; one end of the second 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 terminal of the first operational amplifier; the connection point between the second resistor and the inverting input terminal of the first operational amplifier is connected to one end of the third resistor, and the other end of the third resistor is connected to the output terminal 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 non-inverting input of the second operational amplifier; one end of the fifth 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 of the second operational amplifier; the connection between the fifth resistor and the inverting input of the second operational amplifier is connected to one end of the sixth resistor, and the other end of the sixth resistor is connected to the output 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 second capacitor and an eighth resistor; One end of the first capacitor is connected to a connection point between the second diode and the first resistor, and the other end of the first capacitor is connected to a connection point between the fourth diode and the second resistor; One end of the second capacitor is connected to a connection point between the sixth diode and the fourth resistor, and the other end of the second capacitor is connected to a connection point between the eighth diode and the fifth resistor; One end of the seventh resistor is connected to the connection point between the first resistor and the first operational amplifier, and the other end of the seventh resistor is grounded; One end of the eighth resistor is connected to a connection point between the fourth resistor and the second operational amplifier, and the other end of the eighth resistor is grounded.

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 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; A connection point 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 grounded; 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; A 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 an 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 determination 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 terminal 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 end of the fourth operational amplifier is connected to the input end of the first bypass unit and the input end of the second bypass unit respectively; One end of the fourteenth resistor is connected to the connection point of the thirteenth resistor and the fourth operational amplifier, and the other end of the fourteenth resistor is grounded; 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 triode and a first driving interface, and the second bypass unit includes a second triode and a second driving 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 transistor is connected to the connection point between the fourth operational amplifier and the fifteenth resistor, the collector of the first transistor is connected to one end of the first driving interface, and 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 point between the fourth operational amplifier and the fifteenth resistor, the collector of the second triode is connected to one end of the second driving interface, and the emitter of the second triode 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 point between the fourth operational amplifier and the fifteenth resistor, the collector of the third triode is connected to the cathode of the light emitting diode, and the emitter of the third triode is grounded; 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: A switch is connected at 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.

10. A device, characterized in that: A circuit structure comprising a bypass control circuit of an AC charging pile as described in any one of claims 1-9.

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