Charging pile and new energy automobile handshake signal generation and detection device and charging pile

Abstract

The utility model discloses a charging pile and new energy automobile handshake signal generation and detection device and a charging pile, and the device comprises a CP signal generation circuit, a CP signal detection circuit, and an automobile end diode detection circuit. The input end of the CP signal detection circuit and the input end of the vehicle end diode detection circuit are both connected to the output port of the CP signal generation circuit, the CP signal detection circuit is provided with a first sampling point, and the vehicle end diode detection circuit is provided with a second sampling point. According to the utility model, the charging detection circuit of the new energy automobile is simplified, fewer devices are adopted, the equipment cost is reduced, and the comprehensive detection function of the circuit is realized.

Description

TECHNICAL FIELD

[0001] The utility model belongs to charging technical field, concretely relates to a kind of charging pile and new energy vehicle handshake signal generation and detection device and charging pile. BACKGROUND

[0002] CP (control pilot) signal detection circuit is used to monitor the function of interaction between electric vehicle and power supply equipment, to confirm charging state.The Chinese patent with publication number CN 217981665 U proposes a CP signal generation and detection circuit, the disclosed CP signal generation unit adopts the form of optocoupler plus operational amplifier follower, and the detection circuit adopts voltage lifting and linear proportional amplification circuit, involving many components, MCU end needs to continuously collect and waveform analyze CP signal, to obtain accurate result, which is not conducive to simplify data processing procedure.Moreover, with the rapid development of new energy vehicle market, the detection circuit with single function cannot meet the diversification development of electric vehicle detection means. UTILITY MODEL CONTENT

[0003] Technical purpose: in view of the above technical problem, the utility model proposes a kind of charging pile and new energy vehicle handshake signal generation and detection device and charging pile, it has the multiple function design of CP signal generation, detection and car end diode detection, structure is exquisite, detection standard, convenient.

[0004] Technical scheme: to achieve the above technical purpose, the utility model adopts the following technical scheme:

[0005] A kind of charging pile and new energy vehicle handshake signal generation and detection device, including CP signal generation circuit, CP signal detection circuit and car end diode detection circuit, the CP signal generation circuit is equipped with CP signal output port, the input end of CP signal detection circuit and the input end of car end diode detection circuit are all connected to CP signal output port;

[0006] The CP signal detection circuit includes first diode, first filter circuit and signal follower circuit, the anode of first diode is connected CP signal output port, cathode is connected the input end of first filter circuit, the output end of first filter circuit is connected the input end of signal follower circuit, the output end of signal follower circuit is equipped with first sampling point;

[0007] The car end diode detection circuit includes second diode, second filter circuit and reverse amplification circuit, the cathode of second diode is connected CP signal output port, anode is connected the input end of second filter circuit, the output end of second filter circuit is connected the input end of reverse amplification circuit, the output end of reverse amplification circuit is equipped with second sampling point;

[0008] The first sampling point and the second sampling point are electrically connected to a processor arranged in the charging pile.

[0009] Preferably, the CP signal generation circuit comprises a signal amplification circuit for receiving a first amplitude PWM signal generated by a processor arranged in the charging pile, and outputting a ±12V PWM signal through a CP signal output port.

[0010] Preferably, the signal amplification circuit adopts an amplification circuit composed of an operational amplifier and a plurality of resistors, comprising a first operational amplifier, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a 3.3V positive voltage, a 12V positive voltage and a 12V negative voltage, and the first operational amplifier adopts an operational amplifier with a model number of LM392DR2G.

[0011] The first resistor and the second resistor are connected in series between the 3.3V positive voltage and the ground terminal, and the common connection point of the first resistor and the second resistor is connected to pin three of the first operational amplifier, i.e. the non-inverting input terminal; pin two of the first operational amplifier, i.e. the inverting input terminal, is provided with the third resistor, and the first amplitude PWM signal enters the first operational amplifier through the third resistor; pin one of the first operational amplifier, i.e. the output terminal, is provided with the fourth resistor, one end of the fourth resistor is connected to pin eight of the first operational amplifier through the fifth resistor, and the other end serves as the CP signal output port, outputting a 1KHz, 12V PWM signal; pin eight of the first operational amplifier is connected to the 12V positive voltage, and pin four is connected to the 12V negative voltage.

[0012] Preferably, the signal follower circuit in the CP signal detection circuit and the reverse amplification circuit in the vehicle-end diode detection circuit adopt a circuit composed of an operational amplifier with two or more operational amplification units.

[0013] Preferably, in the CP signal detection circuit, the first filter circuit adopts a filter circuit composed of a plurality of resistors and capacitors, comprising a sixth resistor, a seventh resistor, a first capacitor and a second capacitor; the signal follower circuit comprises a second operational amplifier, an eighth resistor, a ninth resistor, a third capacitor and a 12V positive voltage, and the second operational amplifier adopts an operational amplifier with a model number of LM358AD.

[0014] The negative electrode of the first diode is connected with one end of the first capacitor and one end of the sixth resistor, and the other end of the first capacitor is grounded; the other end of the sixth resistor is connected with one end of the second capacitor, one end of the seventh resistor and pin three of the second operational amplifier, i.e. the same phase input end, and the other end of the third capacitor and the other end of the third resistor are both grounded; pin two of the second operational amplifier, i.e. the inverse phase input end, is connected with pin one, i.e. the output end, through the eighth resistor; pin one of the second operational amplifier, i.e. the output end, is connected with the ground through the ninth resistor and the second capacitor in series, and the common connection point of the ninth resistor and the second capacitor serves as the first sampling point and is connected with the ADC pin of the processor arranged in the charging pile.

[0015] Preferably, in the car end diode detection circuit, the second filter circuit comprises the tenth resistor, the eleventh resistor, the fourth capacitor and the fifth capacitor, the reverse amplification circuit comprises the second operational amplifier, the twelfth resistor, the thirteenth resistor, the sixth capacitor and the 12V positive voltage, and the second operational amplifier adopts the operational amplifier with the model of LM358AD.

[0016] The positive electrode of the second diode is connected with one end of the fourth capacitor and one end of the tenth resistor, and the other end of the fourth capacitor is grounded; the other end of the tenth resistor is connected with one end of the fifth capacitor and one end of the eleventh resistor, and the other end of the fifth capacitor is grounded; the other end of the eleventh resistor is connected with pin six of the second operational amplifier, i.e. the inverse phase input end; pin five of the second operational amplifier, i.e. the same phase input end, is grounded; pin seven of the second operational amplifier, i.e. the output end, is connected with the ground through the twelfth resistor and the sixth capacitor in series, and is connected with pin six, i.e. the inverse phase input end, through the thirteenth resistor; the common connection point of the twelfth resistor and the sixth capacitor serves as the second sampling point and is connected with the ADC pin of the processor arranged in the charging pile.

[0017] A charging pile is provided with the charging pile and new energy vehicle handshake signal generation and detection device.

[0018] Beneficial effects: due to the adoption of the above technical scheme, the utility model has the following beneficial effects:

[0019] The utility model simplifies the new energy vehicle charging detection circuit, adopts fewer devices to realize, reduces the equipment cost, and realizes the comprehensive detection function of the circuit. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 It is a schematic diagram of the charging pile and new energy vehicle handshake signal generation and detection device provided by the utility model;

[0021] Figure 2 It is an example diagram of the CP signal generation circuit;

[0022] Figure 3 It is an example diagram of the CP signal generation circuit;

[0023] Figure 4 An example diagram of a CP signal generation circuit for the device;

[0024] Figure 5 An example diagram of a CP signal generation circuit for the device; Figure 1 An example diagram of a CP signal generation circuit for the device during simulation;

[0025] Figure 6 An example diagram of a CP signal generation circuit for the device during simulation;

[0026] Figure 7 An example diagram of a CP signal generation circuit for the device during simulation;

[0027] Figure 8 An example diagram of a CP signal generation circuit for the device during simulation;

[0028] Figure 9 An example diagram of a CP signal generation circuit for the device during simulation;

[0029] Figure 10 An example diagram of a CP signal generation circuit for the device during simulation;

[0030] Figure 11 An example diagram of a CP signal generation circuit for the device during simulation;

[0031] Figure 12 An example diagram of a CP signal generation circuit for the device during simulation;

[0032] Wherein, R1, first resistance; R2, second resistance; R3, third resistance; R4, fourth resistance; R5, fifth resistance; R6, sixth resistance; R7, seventh resistance; R8, eighth resistance; R9, ninth resistance; R10, tenth resistance; R11, eleventh resistance; R12, twelfth resistance; R13, thirteenth resistance; R14, fourteenth resistance; R15, fifteenth resistance; D1, first diode; D2, second diode; D3, third diode; C1, first capacitor; C2, second capacitor; C3, third capacitor; C4, fourth capacitor; C5, fifth capacitor; C6, sixth capacitor; C7, seventh capacitor; S1, first button; S2, second button. DETAILED DESCRIPTION

[0033] The embodiments of the present application will be described in detail below with reference to the accompanying drawings.

[0034] Embodiment One

[0035] The present application provides a kind of charging pile and new energy vehicle handshake signal generation and detection device, such as Figure 1As shown, it comprises: CP signal generating circuit, CP signal detection circuit and vehicle end diode detection circuit, wherein the CP signal generating circuit is provided with a CP signal output port as a detection point of CP signal, which is connected with the corresponding interface terminal of the charged equipment such as new energy vehicle, and is generally realized through the charging pile and the charging interface on the new energy vehicle.

[0036] 1、Hardware structure

[0037] The CP signal detection circuit designed in the utility model comprises a filter circuit, which filters the CP alternating current signal into direct current signal, so that the MCU end only needs to collect a constant voltage, the collection program writing of the MCU is simplified, and the probability of deviation in collection is reduced. Figure 2 As shown in the example, it comprises a first diode D1, a first filter circuit and a signal following circuit, the positive electrode of the first diode D1 is connected with the CP signal output port, the negative electrode is connected with the input end of the first filter circuit, the output end of the first filter circuit is connected with the input end of the signal following circuit, the output end of the signal following circuit is provided with a first sampling point, and the sampling point is connected to the ADC terminal of the MCU.

[0038] Figure 2 In the example, the first filter circuit adopts a filter circuit composed of a plurality of resistors and capacitors, comprising a sixth resistor R6, a seventh resistor R7, a first capacitor C1 and a second capacitor C2; the signal following circuit comprises a second operational amplifier U2, an eighth resistor R8, a ninth resistor R9, a third capacitor C3 and a 12V positive voltage, and the second operational amplifier U2 adopts an operational amplifier with a model number of LM358AD. The negative electrode of the first diode D1 is connected with one end of the first capacitor C1 and one end of the sixth resistor R6, and the other end of the first capacitor C1 is grounded; the other end of the sixth resistor R6 is connected with one end of the second capacitor C2, one end of the seventh resistor R7 and pin three of the second operational amplifier U2, i.e. the same phase input end, the other end of the third capacitor C3 and the other end of the third resistor R3 are both grounded; pin two of the second operational amplifier U2, i.e. the inverting input end, is connected with pin one, i.e. the output end, after the eighth resistor R8; pin one of the second operational amplifier U2, i.e. the output end, is grounded after the ninth resistor R9 and the second capacitor C2 in series, and the common connection point of the ninth resistor R9 and the second capacitor C2 serves as the first sampling point.

[0039] In the example, the vehicle end diode detection circuit is also designed, which aims to increase the vehicle end diode detection function, improve the detection efficiency and charging safety, and the vehicle end diode circuit comprises a reverse amplification circuit, which can be realized by a circuit composed of an operational amplifier with two or more operational amplification units together with the signal following circuit in the CP signal detection circuit. As shown in the example, Figure 3As shown, the vehicle end diode detection circuit includes a second diode D2, a second filter circuit and a reverse amplification circuit, the negative electrode of the second diode D2 is connected to the CP signal output port, the positive electrode is connected to the input end of the second filter circuit, the output end of the second filter circuit is connected to the input end of the reverse amplification circuit, and the output end of the reverse amplification circuit is provided with a second sampling point.

[0040] Figure 3 In the second filter circuit, the second filter circuit includes a tenth resistor R10, an eleventh resistor R11, a fourth capacitor C4 and a fifth capacitor C5, and the reverse amplification circuit includes a second operational amplifier U2, a twelfth resistor R12, a thirteenth resistor R13, a sixth capacitor C6 and a 12V positive voltage. The second operational amplifier U2 is an operational amplifier with model number LM358AD. The positive electrode of the second diode D2 is connected to one end of the fourth capacitor C4 and one end of the tenth resistor R10, and the other end of the fourth capacitor C4 is grounded; the other end of the tenth resistor R10 is connected to one end of the fifth capacitor C5 and one end of the eleventh resistor R11, and the other end of the fifth capacitor C5 is grounded; the other end of the eleventh resistor R11 is connected to pin six of the second operational amplifier U2, i.e. the inverting input end; pin five of the second operational amplifier U2, i.e. the non-inverting input end, is grounded; pin seven of the second operational amplifier U2, i.e. the output end, is grounded through the twelfth resistor R12 and the sixth capacitor C6 in series, and is connected to pin six, i.e. the inverting input end, through the thirteenth resistor R13; the common connection point of the twelfth resistor R12 and the sixth capacitor C6 is the second sampling point, and is connected to the ADC pin of the processor MCU provided in the charging pile.

[0041] In addition, a CP signal generation circuit is designed in the embodiment, as shown in Figure 4 The signal amplification circuit is used to receive a first amplitude PWM signal (such as 3.3V, 1KHz), convert it into a ±12V PWM signal, and then output it through the CP signal output port, wherein the first amplitude PWM signal is generated by the processor MCU provided in the charging pile.

[0042] Figure 4In the signal amplification circuit, the signal amplification circuit is composed of an operational amplifier and a plurality of resistors, including a first operational amplifier U1, a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a 3.3V positive voltage, a 12V positive voltage and a 12V negative voltage, and the first operational amplifier U1 is an operational amplifier with a model number of LM392DR2G. The first resistor R1 and the second resistor R2 are connected in series between the 3.3V positive voltage and the ground terminal, and the common connection point of the first resistor R1 and the second resistor R2 is connected to pin three of the first operational amplifier U1, that is, the non-inverting input terminal. Pin two of the first operational amplifier U1, that is, the inverting input terminal, is provided with the third resistor R3, and the first amplitude PWM signal enters the first operational amplifier through the third resistor R3. Pin one of the first operational amplifier U1, that is, the output terminal, is provided with the fourth resistor R4, one end of the fourth resistor R4 is connected to pin eight of the first operational amplifier U1 through the fifth resistor R5, and the other end is used as the CP signal output port to output a 1KHz, 12V PWM signal. Pin eight of the first operational amplifier U1 is connected to the 12V positive voltage, and pin four is connected to the 12V negative voltage.

[0043] 2. Simulation test

[0044] In this embodiment, the above design is simulated in software, Figure 5 The circuit shown in the figure simulates the CP signal of the charged new energy vehicle, and the third diode D3, the first button S1, the second button S2, the fourteenth resistor R14 and the fifteenth resistor R15 form the CP signal circuit of the vehicle charger part. The handshake process between the alternating current charging pile and the new energy vehicle is simulated. The common connection point of the first button S1 and the fourth resistor R4 is provided with the seventh capacitor C7, and the other end of the seventh capacitor C7 is grounded. During simulation, the CP signal generation circuit, the CP signal detection circuit and the vehicle end diode detection circuit are respectively set according to Figures 2 to 4 The circuit structure is drawn, and in the CP signal generation circuit, a signal generator can be used to simulate the PWM signal with a frequency of 1KHz and an amplitude of 3.3V generated by the MCU. Two input channels of a first oscilloscope XSC1 are set at the first sampling point and the second sampling point, and a second oscilloscope XSC1 is set at one end of the fourth resistor R4. XSC1 and XSC2 are oscilloscopes, which are respectively used to test the CP detection signal and the CP signal.

[0045] 2.1, simulation data of detection point

[0046] In this embodiment, the CP signal generation circuit is used to convert the PWM signal with an amplitude of 3.3V into a PWM signal with ±12V, and the frequency of 1KHz is kept unchanged. According to the current common test process in the industry, the CP signal is divided into three states in the charging handshake stage. The three states are simulated respectively as follows:

[0047] State one (open key S1): CP signal absolute value of the detection point should be 12V (minimum 11V, maximum 13V), the simulation results as shown in Figure 6 , the amplitude is 11.957V, which meets the requirements.

[0048] State two (closed key S1, open key S2): CP signal absolute value of the detection point should be 9V (minimum 8V, maximum 10V), the simulation results as shown in Figure 7 , the amplitude is 8.754V, which meets the requirements.

[0049] State three (closed key S1, closed key S2): CP signal absolute value of the detection point should be 6V (minimum 5V, maximum 7V), the simulation results as shown in Figure 8 , the amplitude is 5.592V, which meets the requirements.

[0050] 2.2, simulation data of the first sampling point and the second sampling point

[0051] In this embodiment, the detection circuit is divided into two parts, the first part is to detect the CP signal voltage amplitude through the CP signal detection circuit, and the second part is to detect the existence of the diode through the vehicle end diode detection circuit.

[0052] In the CP signal detection circuit, the first diode D1 is used to filter out the negative pulse part, and the filtering and voltage division are realized through the first filter circuit. The processed signal is then passed through the operational amplifier LM358AD to realize signal following, and finally output to the ADC pin of the MCU. The MCU detects different voltage values to determine which state the CP signal circuit is in, that is, the simulation data of the first sampling point is as follows:

[0053] State one (open key S1): as Figure 9 shown in the simulation results, the sampling value obtained is 2.886V.

[0054] State two (closed key S1, open key S2): as Figure 10 shown in the simulation results, the sampling value obtained is 2.162V.

[0055] State three (closed key S1, closed key S2): as Figure 11 shown in the simulation results, the sampling value obtained is 1.345V.

[0056] In the vehicle end diode detection circuit, the second diode D2 is used to filter the positive pulse signal, and the later-stage resistance and capacitance and the operational amplifier constitute a filter and reverse amplification circuit to generate a stable voltage value, which is sent to the ADC detection pin of the MCU.

[0057] When the charging gun on the charging pile is inserted into the car, due to the presence of the car-end diode, the negative pulse of the CP signal will not pass through the car-end diode to be divided by the rear-stage resistor, so that the voltage value of the second sampling point measured at the MCU end of the charging pile is a constant value and will not change with the change of the mode; if the charging gun is inserted into a load device without a diode, the detection value of the second sampling point will change in different modes. The detection value of the normal second sampling point after the circuit is inserted into the car is 2.87V, as shown in Figure 12 , and the value is always maintained.

[0058] Embodiment Two

[0059] The embodiment provides a charging pile which is provided with the charging pile and new energy vehicle handshake signal generation and detection device as described in embodiment one.

[0060] The basic principle, main features and advantages of the utility model are shown and described above. The skilled in the art should understand that the above examples do not limit the utility model in any form, and any technical solution obtained by equivalent replacement or equivalent transformation falls within the protection scope of the utility model.

Claims

1. A charging pile and new energy vehicle handshake signal generation and detection device, characterized in that: The CP signal generation circuit, the CP signal detection circuit and the vehicle end diode detection circuit are provided, the CP signal generation circuit is provided with a CP signal output port, the input end of the CP signal detection circuit and the input end of the vehicle end diode detection circuit are connected to the CP signal output port; The CP signal detection circuit comprises a first diode (D1), a first filter circuit and a signal follower circuit, the positive electrode of the first diode (D1) is connected to the CP signal output port, the negative electrode is connected to the input end of the first filter circuit, the output end of the first filter circuit is connected to the input end of the signal follower circuit, and the output end of the signal follower circuit is provided with a first sampling point; The vehicle end diode detection circuit comprises a second diode (D2), a second filter circuit and a reverse amplification circuit, the negative electrode of the second diode (D2) is connected to the CP signal output port, the positive electrode is connected to the input end of the second filter circuit, the output end of the second filter circuit is connected to the input end of the reverse amplification circuit, and the output end of the reverse amplification circuit is provided with a second sampling point; The first sampling point and the second sampling point are electrically connected to the processor arranged in the charging pile.

2. The charging pile and new energy vehicle handshake signal generation and detection device according to claim 1, characterized in that: The CP signal generation circuit comprises a signal amplification circuit, the signal amplification circuit is used for receiving a PWM signal with a first amplitude, converting the PWM signal into a PWM signal with ±12V and then outputting the PWM signal through the CP signal output port, wherein the PWM signal with the first amplitude is generated by the processor arranged in the charging pile. 3.The charging pile and new energy vehicle handshake signal generation and detection device according to claim 2, characterized in that: The signal amplification circuit adopts an amplification circuit composed of an operational amplifier and a plurality of resistors, comprising a first operational amplifier (U1), a first resistor (R1), a second resistor (R2), a third resistor (R3), a fourth resistor (R4), a fifth resistor (R5), a 3.3V positive voltage, a 12V positive voltage and a 12V negative voltage, and the first operational amplifier (U1) adopts an operational amplifier with a model of LM392DR2G; The first resistor (R1) and the second resistor (R2) are connected in series between the 3.3V positive voltage and the ground end, the common connection point of the first resistor (R1) and the second resistor (R2) is connected to pin three of the first operational amplifier (U1), i.e. the same-phase input end; pin two of the first operational amplifier (U1), i.e. the opposite-phase input end is provided with the third resistor (R3), the PWM signal with the first amplitude enters the first operational amplifier (U1) through the third resistor (R3); pin one of the first operational amplifier (U1), i.e. the output end is provided with the fourth resistor (R4), one end of the fourth resistor (R4) is connected to pin eight of the first operational amplifier (U1) through the fifth resistor (R5), the other end is the CP signal output port, and a PWM signal with 1KHz and 12V is output; pin eight of the first operational amplifier (U1) is connected to the 12V positive voltage, and pin four is connected to the 12V negative voltage.

4. The charging pile and new energy vehicle handshake signal generation and detection device according to claim 1, characterized in that: The signal follower circuit in the CP signal detection circuit and the reverse amplification circuit in the vehicle end diode detection circuit adopt a circuit composed of an operational amplifier with two or more operational amplification units.

5. The charging pile and new energy vehicle handshake signal generation and detection device according to claim 1, characterized in that: In the CP signal detection circuit, the first filter circuit adopts a filter circuit composed of a plurality of resistors and capacitors, including a sixth resistor (R6), a seventh resistor (R7), a first capacitor (C1) and a second capacitor (C2); the signal following circuit includes a second operational amplifier (U2), an eighth resistor (R8), a ninth resistor (R9), a third capacitor (C3) and a 12V positive voltage, and the second operational amplifier (U2) adopts an operational amplifier with a model number of LM358AD; The negative electrode of the first diode (D1) is connected to one end of the first capacitor (C1) and one end of the sixth resistor (R6), and the other end of the first capacitor (C1) is grounded; the other end of the sixth resistor (R6) is connected to one end of the second capacitor (C2), one end of the seventh resistor (R7) and pin three of the second operational amplifier (U2), i.e. the same phase input end, and the other end of the third capacitor (C3) and the other end of the third resistor (R3) are both grounded; pin two of the second operational amplifier (U2), i.e. the inverting input end, is connected to pin one, i.e. the output end, after passing through the eighth resistor (R8); pin one of the second operational amplifier (U2), i.e. the output end, is grounded after passing through the series-connected ninth resistor (R9) and second capacitor (C2), and the common connection point of the ninth resistor (R9) and the second capacitor (C2) serves as a first sampling point and is connected to an ADC pin of a processor arranged in the charging pile.

6. The charging pile and new energy vehicle handshake signal generation and detection device according to claim 1, characterized in that: In the vehicle-end diode detection circuit, the second filter circuit includes a tenth resistor (R10), an eleventh resistor (R11), a fourth capacitor (C4) and a fifth capacitor (C5), the inverse amplification circuit includes a second operational amplifier (U2), a twelfth resistor (R12), a thirteenth resistor (R13), a sixth capacitor (C6) and a 12V positive voltage, and the second operational amplifier (U2) adopts an operational amplifier with a model number of LM358AD; The positive electrode of the second diode (D2) is connected to one end of the fourth capacitor (C4) and one end of the tenth resistor (R10), and the other end of the fourth capacitor (C4) is grounded; the other end of the tenth resistor (R10) is connected to one end of the fifth capacitor (C5) and one end of the eleventh resistor (R11), the other end of the fifth capacitor (C5) is grounded, and the other end of the eleventh resistor (R11) is connected to pin six of the second operational amplifier (U2), i.e. the inverting input end; pin five of the second operational amplifier (U2), i.e. the same phase input end, is grounded; pin seven of the second operational amplifier (U2), i.e. the output end, is grounded after passing through the series-connected twelfth resistor (R12) and sixth capacitor (C6), and is connected to pin six, i.e. the inverting input end, after passing through the thirteenth resistor (R13); the common connection point of the twelfth resistor (R12) and the sixth capacitor (C6) serves as a second sampling point and is connected to an ADC pin of a processor arranged in the charging pile.

7. A charging post, characterized by: The charging pile is provided with the handshake signal generation and detection device for new energy vehicles according to any one of claims 1-6.

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