Charging pile control guide circuit and diode detection circuit thereof

Abstract

The utility model relates to the technical field of automobile charging, in particular to a charging pile control guide circuit and a diode detection circuit thereof. The diode detection circuit of the charging pile control guide circuit comprises a differential amplification circuit, a control guide signal acquisition circuit and a reference source circuit, the control guide signal acquisition circuit is used for acquiring signals of an electric vehicle, and the reference source circuit is used for integrally pulling up the signals of the electric vehicle, so that the detection precision of the diode detection circuit is improved. A negative value signal on the control guide circuit is pulled up to be a positive value signal, so that a processor can perform acquisition conveniently, whether a diode on the control guide circuit exists or not can be accurately detected before the charging pile charges an electric vehicle, a real charging request source is more accurately identified, and the charging efficiency is improved. And the safe operation of the electric vehicle charging system is further ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of automobile charging, in particular to a charging pile control guide circuit and a diode detection circuit thereof. Background Art

[0002] As the country increases its policy support for new energy vehicles, the new energy vehicle market has entered a period of rapid development. Electric vehicles are becoming increasingly popular, and there are more and more charging facilities for electric vehicles. The stability and safety of their performance directly affect the promotion of electric vehicles, so the safety and reliability of the charging process are crucial.

[0003] In the relevant requirements of the new national standard GB / T 18487.1-2023, in order to ensure that the charging pile correctly identifies the connected device as an electric vehicle rather than other load devices, the existence of the diode on the control pilot circuit is detected to verify that the charging pile is connected to an electric vehicle. The charging pile of the prior art can only detect the positive signal of the control pilot circuit, but cannot detect the negative signal of the control pilot circuit, and thus cannot detect the diode on the control pilot circuit, which may lead to the risk of charging non-electric vehicle devices and cause unpredictable consequences. Utility Model Content

[0004] The embodiment of the utility model provides a detection circuit for a diode in a charging pile control guide circuit and a charging pile, so as to solve the problem in the prior art that the diode on the control guide circuit cannot be detected, resulting in unpredictable consequences when charging non-electric vehicle equipment.

[0005] In a first aspect, the utility model provides a diode detection circuit of a charging pile control guide circuit, comprising: a differential amplifier circuit, a control guide signal acquisition circuit and a reference source circuit, wherein the input end of the differential amplifier circuit is electrically connected to a processor, the output end of the differential amplifier circuit is used to connect a charging load, and the differential amplifier circuit is used to differentially amplify the control guide signal output by the processor;

[0006] The first input end of the control guide signal acquisition circuit is connected to the charging load, the second input end of the control guide signal acquisition circuit is connected to the output end of the reference source circuit, the output end of the control guide signal acquisition circuit is electrically connected to the processor, a reference voltage source is serially connected in the reference source circuit, the input end of the reference source circuit is connected to a first power supply, and the control guide signal acquisition circuit is used to obtain the signal of the charging load, and convert the signal of the charging load according to the reference source circuit and transmit it to the processor.

[0007] In one embodiment, the reference source circuit also includes: a first voltage divider branch, the input end of the first voltage divider branch is connected to the first power supply, the first output end of the first voltage divider branch is connected to the reference signal end of the reference voltage source, the second output end of the first voltage divider branch is grounded, the input end of the reference voltage source is grounded, the output end of the reference voltage source is connected to the input end of the first voltage divider branch, and the output end of the reference voltage source is connected to the second input end of the control guidance signal acquisition circuit.

[0008] In one embodiment, the reference source circuit further includes: a filter branch, one end of the filter branch is connected to the input end of the reference voltage source, and the other end of the filter branch is connected to the output end of the reference voltage source.

[0009] In one implementation, the reference voltage source is a TL431.

[0010] In one embodiment, the diode detection circuit further includes: a switch control circuit, wherein the input end of the switch control circuit is connected to the output end of the differential amplifier circuit, the output end of the switch control circuit is connected to the charging load, and the control end of the switch control circuit is electrically connected to the processor.

[0011] In one embodiment, the switch control circuit includes: a first switch branch and a second switch branch, the input end of the first switch branch is connected to the control end of the second switch branch, the output end of the first switch branch is grounded, the control end of the first switch branch is electrically connected to the processor, the input end of the second switch branch is connected to the output end of the differential amplifier circuit, and the output end of the second switch branch is used to connect the charging load.

[0012] In one embodiment, the second switch branch includes: a relay and a protection branch, the first coil end of the relay is connected to the first power supply, the second coil end of the relay is connected to the input end of the first switch branch, the normally open end of the relay is connected to the output end of the differential amplifier circuit, the common end of the relay is connected to the charging load, the input end of the protection branch is connected to the second coil end of the relay, and the output end of the protection branch is connected to the first power supply.

[0013] In one embodiment, the control guidance signal acquisition circuit includes: a second voltage-dividing branch, a first negative feedback branch and a first operational amplifier, the input end of the second voltage-dividing branch is electrically connected to the charging load, the output end of the second voltage-dividing branch is connected to the non-inverting input end of the first operational amplifier, the first input end of the first negative feedback branch is connected to the output end of the reference source circuit, the second input end of the first negative feedback branch is connected to the output end of the first operational amplifier, the output end of the first negative feedback branch is connected to the inverting input end of the first operational amplifier, and the output end of the first operational amplifier is electrically connected to the processor.

[0014] In one embodiment, the differential amplifier circuit includes: a third voltage-dividing branch, a second negative feedback branch, and a second operational amplifier, the input end of the third voltage-dividing branch is electrically connected to the processor, the output end of the third voltage-dividing branch is connected to the non-inverting input end of the second operational amplifier, the first input end of the second negative feedback branch is connected to the output end of the second operational amplifier, the second input end of the second negative feedback branch is connected to the inverting input end of the second operational amplifier, the output end of the second negative feedback branch is grounded, and the output end of the second operational amplifier is used to connect a charging load.

[0015] In a second aspect, this embodiment provides a charging pile control steering circuit, and the charging pile control steering circuit includes a diode detection circuit of the charging pile control steering circuit as described in the first aspect and its improvement.

[0016] Compared with the prior art, the embodiments of the present invention have the following beneficial effects:

[0017] The diode detection circuit of the charging pile control guide circuit of the utility model comprises: a differential amplifier circuit, a control guide signal acquisition circuit and a reference source circuit. While the control guide signal acquisition circuit is used to acquire the signal of the electric vehicle, the reference source circuit is used to pull up the signal of the electric vehicle as a whole, and the negative signal on the control guide circuit is pulled up to a positive signal, which is convenient for the processor to collect. Before the charging pile charges the electric vehicle, it can accurately detect whether the diode on the control guide circuit exists, more accurately identify the real source of the charging request, and further ensure the safe operation of the electric vehicle charging system. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the description of the embodiments of the utility model will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0019] Figure 1 It is a schematic diagram of the module structure of the diode detection circuit of the charging pile control pilot circuit provided by one embodiment of the utility model;

[0020] Figure 2 It is a circuit connection diagram of a reference source circuit provided by an embodiment of the utility model;

[0021] Figure 3 It is a schematic diagram of the module structure of the diode detection circuit of the charging pile control pilot circuit provided by one embodiment of the utility model;

[0022] Figure 4 This is a circuit connection diagram of a switch control circuit provided in one embodiment of the utility model;

[0023] Figure 5 This is a circuit connection diagram of a control guidance signal acquisition circuit provided by an embodiment of the utility model;

[0024] Figure 6 It is a circuit connection diagram of a differential amplifier circuit provided in one embodiment of the utility model;

[0025] Among them, 1. differential amplifier circuit, 2. control guide signal acquisition circuit, 3. reference source circuit, 4. processor, 5. charging load, 6. switch control circuit, 11. third voltage divider branch, 12. second negative feedback circuit, 21. second voltage divider branch, 22. first negative feedback branch, 31. reference voltage source, 32. first voltage divider branch, 33. filter branch, 61. first switch branch, 62. second switch branch, 621. protection branch. DETAILED DESCRIPTION

[0026] In order to make the technical problems, technical solutions and beneficial effects solved by the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0027] In the description of the present invention, it should be understood that the terms "longitudinal", "radial", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0028] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0029] In order to thoroughly understand the present invention, detailed structures and steps will be presented in the following description to illustrate the technical solution proposed by the present invention. The preferred embodiments of the present invention are described in detail below, but in addition to these detailed descriptions, the present invention may also have other implementations.

[0030] Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the disclosure belongs. It will be further understood that the terms used herein should be interpreted as having a meaning consistent with their meaning in the context of this specification and the relevant technology, and will not be interpreted in an idealized or overly formal sense unless explicitly defined as such herein.

[0031] In one embodiment, if Figure 1 As shown, a schematic diagram of the module structure of a diode detection circuit of a charging pile control guidance circuit is provided, including: a differential amplifier circuit 1, a control guidance signal acquisition circuit 2 and a reference source circuit 3, the input end of the differential amplifier circuit 1 is electrically connected to a processor 4, the output end of the differential amplifier circuit 1 is used to connect a charging load 5, and the differential amplifier circuit 1 is used to differentially amplify the control guidance signal output by the processor 4;

[0032] The first input end of the control guide signal acquisition circuit 2 is connected to the charging load 5, the second input end of the control guide signal acquisition circuit 2 is connected to the output end of the reference source circuit 3, the output end of the control guide signal acquisition circuit 2 is electrically connected to the processor 4, a reference voltage source 31 is serially connected in the reference source circuit 3, the input end of the reference source circuit 3 is connected to a first power supply, the control guide signal acquisition circuit 2 is used to obtain the signal of the charging load 5, and convert the signal of the charging load 5 according to the reference source circuit 3 and transmit it to the processor 4.

[0033] Specifically, an operational amplifier is provided in the differential amplifier circuit 1, and the differential amplifier circuit 1 is used to convert the 0-3.3V voltage signal output by the processor 4 into a ±12V pulse signal for charging the charging load 5. Preferably, the processor 4 is a CPU.

[0034] The control guidance signal acquisition circuit 2 is used to feed back the signal of the charging load 5 to the processor 4. Specifically, the control guidance signal acquisition circuit 2 proportionally reduces the signal of the charging load 5 and transmits it to the processor 4. Since the processor 4 cannot accept negative signals, the reference source circuit 3 is used to raise the reduced signal as a whole, so that the reduced signal is all positive signals, and then transmitted to the processor 4.

[0035] The reference voltage source 31 may be any reference voltage source, the reference voltage source 31 may be TL431, the reference voltage source 31 may be LM431, the reference voltage source 31 may be LM258, and preferably, the reference voltage source 31 is TL431.

[0036] The working process of the diode detection circuit of the above-mentioned charging pile control guidance circuit is as follows: the differential amplifier circuit 1 converts the 0-3.3V voltage signal output by the processor 4 into a ±12V pulse signal to charge the charging load 5, the control guidance signal acquisition circuit 2 proportionally reduces the signal of the charging load 5, and converts the ±12V pulse signal into a ±1.6V signal, the reference source circuit 3 raises the ±1.6V signal as a whole to 0-3.2V, and transmits it to the processor 4 after it meets the sampling range of the processor 4, and the processor 4 processes the signal and makes a judgment. Specifically, since the voltage drop of the diode is 0.7V, if the negative voltage of the charging load 5 is between negative 13 volts and negative 11 volts, it is judged that there is a diode on the charging pile control guidance circuit, that is, the charging pile is connected to an electric car; if the negative voltage of the charging load 5 is greater than negative 11 volts or less than negative 13 volts, it is judged that there is no diode on the charging pile control guidance circuit, that is, the charging pile is connected to other charging loads 5.

[0037] The diode detection circuit of the charging pile control guide circuit of the present embodiment comprises: a differential amplifier circuit 1, a control guide signal acquisition circuit 2 and a reference source circuit 3. While the control guide signal acquisition circuit 2 is used to acquire the signal of the electric vehicle, the reference source circuit 3 is used to pull up the signal of the electric vehicle as a whole, and the negative signal on the control guide circuit is pulled up to a positive signal, which is convenient for the processor 4 to collect. Before the charging pile charges the electric vehicle, it can accurately detect whether the diode on the control guide circuit exists, and more accurately identify the real source of the charging request, further ensuring the safe operation of the electric vehicle charging system.

[0038] like Figure 2 As shown, a circuit connection diagram of a reference source circuit 3 is provided.

[0039] In one embodiment, if Figure 2 As shown in the above Figure 1On the basis of the diode detection circuit of the charging pile control guidance circuit shown, the reference source circuit 3 also includes: a first voltage dividing branch 32, the input end of the first voltage dividing branch 32 is connected to the first power supply, the first output end of the first voltage dividing branch 32 is connected to the reference signal end of the reference voltage source 31, the second output end of the first voltage dividing branch 32 is grounded, the input end of the reference voltage source 31 is grounded, the output end of the reference voltage source 31 is connected to the input end of the first voltage dividing branch 32, and the output end of the reference voltage source 31 is connected to the second input end of the control guidance signal acquisition circuit 2.

[0040] Specifically, the first voltage dividing branch 32 is used to provide a reference signal for the reference voltage source 31. Figure 2 The reference voltage source 31 shown is TL431. In actual application, by adjusting the parameters of the resistors in the first voltage-dividing branch 32, the output end of the reference voltage source 31 outputs a voltage of 1.5V as a reference voltage. Preferably, the accuracy of the resistors R13 and R14 in the first voltage-dividing branch 32 is 1%, the first power supply is +12V, and a resistor R10 can also be set between the first voltage-dividing branch and the first power supply to protect the circuit.

[0041] The working process of the diode detection circuit of the above-mentioned charging pile control guidance circuit is: by adjusting the parameters of the resistor in the first voltage divider branch 32, the output end of the reference voltage source 31 outputs a voltage of 1.5V as a reference voltage, ensuring that the reference source circuit 3 can raise the ±1.6V signal to 0-3.2V.

[0042] The diode detection circuit of the charging pile control guidance circuit of the present embodiment adjusts the signal at the output end of the reference voltage source 31 by setting the first voltage divider branch 32, ensuring that the reference source circuit 3 can raise the ±1.6V signal to 0-3.2V, so that the negative signal on the control guidance circuit can be raised to a positive signal, which is convenient for the processor 4 to collect and enable the processor 4 to more accurately judge the diode on the control guidance circuit.

[0043] In one embodiment, if Figure 2 As shown, based on the above embodiment, the reference source circuit 3 further includes: a filter branch 33, one end of the filter branch 33 is connected to the input end of the reference voltage source 31, and the other end of the filter branch 33 is connected to the output end of the reference voltage source 31.

[0044] Specifically, the filter branch 33 is used to filter the signal input to the second input end of the control guide signal acquisition circuit 2. It can be understood that the filter branch 33 can be any type of filter branch. A filter capacitor is set in the filter branch 33 for filtering. A capacitor and a resistor can also be set in the filter branch 33 for RC filtering. A capacitor and an inductor can also be set in the filter branch 33 for LC filtering. Preferably, Figure 2 As shown, a filter capacitor is provided in the filter branch 33 for filtering.

[0045] The working process of the diode detection circuit of the above charging pile control guidance circuit is as follows: the filtering branch 33 filters the signal of the second input end of the control guidance signal acquisition circuit 2 and then transmits it to the second input end.

[0046] The diode detection circuit of the charging pile control guidance circuit of this embodiment uses the filter branch 33 to filter the signal input to the second input end of the control guidance signal acquisition circuit 2, thereby further improving the accuracy of the signal input to the processor 4 and ensuring the accuracy of the detection.

[0047] In one embodiment, if Figure 2 As shown, based on the above embodiment, the model of the reference voltage source 31 is TL431.

[0048] The diode detection circuit of the charging pile control pilot circuit of this embodiment uses TL431 as a reference voltage source. TL431 has good temperature stability and can achieve any voltage output in the range from a few millivolts to 36V, with high flexibility.

[0049] In one embodiment, if Figure 3 As shown, a schematic diagram of the module structure of a diode detection circuit of a charging pile control pilot circuit is provided. Figure 1 Based on the diode detection circuit of the charging pile control guidance circuit shown, the diode detection circuit also includes: a switch control circuit 6, the input end of the switch control circuit 6 is connected to the output end of the differential amplifier circuit 1, the output end of the switch control circuit 6 is connected to the charging load 5, and the control end of the switch control circuit 6 is electrically connected to the processor 4.

[0050] Specifically, the switch control circuit 6 is used to control the charging of the charging load 5. It can be understood that a switch tube can be set in the switch control circuit 6 to control the charging of the charging load 5, a relay can be set in the switch control circuit 6 to control the charging of the charging load 5, and an optocoupler can also be set in the switch control circuit 6 to control the charging of the charging load 5.

[0051] The working process of the diode detection circuit of the above charging pile control pilot circuit is as follows: the processor 4 judges the charging load 5 according to the signal of the control pilot signal acquisition circuit 2. If the charging load 5 is an electric vehicle, the processor 4 outputs a conduction signal of the switch control circuit 6 to control the switch control circuit 6 to conduct and charge the electric vehicle. If the charging load 5 is other charging equipment, the processor 4 outputs a shutdown signal of the switch control circuit 6 to shut down the switch control circuit 6. Further, when the control pilot signal acquisition circuit 2 acquires the signal of the charging load 5, the switch control circuit 6 can be shut down to ensure that the signal acquired by the control pilot signal acquisition circuit 2 is the signal of the charging load 5.

[0052] The diode detection circuit of the charging pile control guidance circuit of this embodiment is provided with a switch control circuit 6, so that the processor 4 controls the charging of the charging load 5 through the switch control circuit 6, which is convenient for controlling the guidance signal acquisition circuit 2 to collect the signal of the charging load 5, and further ensuring the reliability of the circuit.

[0053] like Figure 4 As shown, a circuit connection diagram of a switch control circuit 6 is provided.

[0054] In one embodiment, if Figure 4 As shown in the above Figure 3 On the basis of the diode detection circuit of the charging pile control guidance circuit shown, the switch control circuit 6 includes: a first switch branch 61 and a second switch branch 62, the input end of the first switch branch 61 is connected to the control end of the second switch branch 62, the output end of the first switch branch 61 is grounded, the control end of the first switch branch 61 is electrically connected to the processor 4, the input end of the second switch branch 62 is connected to the output end of the differential amplifier circuit 1, and the output end of the second switch branch 62 is used to connect the charging load 5.

[0055] Specifically, the control end of the first switch branch 61 is the control end of the switch control circuit 6, and the processor 4 controls the second switch branch 62 by controlling the conduction of the first switch branch 61. It can be understood that the structure of the first switch branch 61 can be the same as the structure of the second switch branch 62, and the structure of the first switch branch 61 can also be different from the structure of the second switch branch 62. Preferably, as Figure 4 As shown, the structures of the first switch branch 61 and the second switch branch 62 are different.

[0056] The working process of the diode detection circuit of the above charging pile control pilot circuit is as follows: the processor 4 judges the charging load 5 according to the signal of the control pilot signal acquisition circuit 2. If the charging load 5 is an electric vehicle, the processor 4 outputs the conduction signal of the first switch branch 61 to control the first switch branch 61 to be turned on. After the first switch branch 61 is turned on, the second switch branch 62 is controlled to be turned on. After the second switch branch 62 is turned on, the electric vehicle is charged. If the charging load 5 is other charging equipment, the processor 4 outputs the shut-down signal of the first switch branch 61, and the first switch branch 61 is turned off. Further, when the control pilot signal acquisition circuit 2 collects the signal of the charging load 5, the switch control circuit 6 can be turned off to ensure that the signal collected by the control pilot signal acquisition circuit 2 is the signal of the charging load 5.

[0057] The diode detection circuit of the charging pile control pilot circuit of this embodiment sets a first switch branch 61 and a second switch branch 62 in the switch control circuit 6 to control the charging of the charging load 5, further improving the stability of the circuit.

[0058] In one embodiment, if Figure 4 As shown, on the basis of the above embodiment, the second switch branch 62 includes: a relay S1 and a protection branch 621, the first coil end of the relay S1 is connected to the first power supply, the second coil end of the relay S1 is connected to the input end of the first switch branch 61, the normally open end of the relay S1 is connected to the output end of the differential amplifier circuit 1, the common end of the relay S1 is connected to the charging load 5, the input end of the protection branch 621 is connected to the second coil end of the relay S1, and the output end of the protection branch 621 is connected to the first power supply.

[0059] The working process of the diode detection circuit of the above charging pile control pilot circuit is: when the first switch branch 61 is turned on, the signal at the second coil end of the relay S1 is pulled low, the relay S1 is turned on, and the signal output by the differential amplifier circuit 1 flows to the charging load 5 through the relay S1.

[0060] In the diode detection circuit of the charging pile control pilot circuit of this embodiment, a relay S1 is provided in the second switch branch 62 to control the signal input to the charging load 5. The relay S1 has good electrical isolation, which can further improve the safety of the circuit.

[0061] In one embodiment, if Figure 5 As shown, a circuit connection diagram of a control guidance signal acquisition circuit 2 is provided. Figure 1On the basis of the diode detection circuit of the charging pile control guidance circuit shown, the control guidance signal acquisition circuit 2 includes: a second voltage dividing branch 21, a first negative feedback branch 22 and a first operational amplifier U1A, the input end of the second voltage dividing branch 21 is electrically connected to the charging load 5, the output end of the second voltage dividing branch 21 is connected to the in-phase input end of the first operational amplifier U1A, the first input end of the first negative feedback branch 22 is connected to the output end of the reference source circuit 3, the second input end of the first negative feedback branch 22 is connected to the output end of the first operational amplifier U1A, the output end of the first negative feedback branch 22 is connected to the inverting input end of the first operational amplifier U1A, and the output end of the first operational amplifier U1A is electrically connected to the processor 4.

[0062] Preferably, the resistance value of the resistor R3 in the second voltage-dividing branch 21 is the same as the resistance value of the resistor R2 in the first negative feedback branch 22, and the resistance value of the resistor R4 in the second voltage-dividing branch 21 is the same as the resistance value of the resistor R1 in the first negative feedback branch 22, so that the control guidance signal acquisition circuit 2 forms differential amplification, the common-mode input voltage is minimized, and the input common-mode interference signal and clutter signal are well suppressed.

[0063] The working process of the diode detection circuit of the above-mentioned charging pile control guidance circuit is: the signal of the charging load 5 flows to the non-inverting input terminal of the first operational amplifier U1A through the second voltage divider branch 21, and the first negative feedback branch 22 transmits the signal at the output terminal of the first operational amplifier U1A to the inverting input terminal of the first operational amplifier U1A. The first operational amplifier U1A adjusts the signal at its non-inverting input terminal according to the signal at its inverting input terminal, and then transmits it to the processor 4.

[0064] The diode detection circuit of the charging pile control guidance circuit of this embodiment sets an operational amplifier in the control guidance signal acquisition circuit 2 to form a differential operational amplifier circuit to collect the signal of the charging load 5, which can suppress the input common-mode interference signal and noise, and at the same time can reduce the offset current and offset voltage, thereby greatly ensuring the accuracy of the signal.

[0065] In one embodiment, if Figure 6 As shown, a schematic diagram of the module structure of a differential amplifier circuit 1 is provided. Figure 1On the basis of the diode detection circuit of the charging pile control guidance circuit shown, the differential amplifier circuit 1 includes: a third voltage-dividing branch 11, a second negative feedback branch 12 and a second operational amplifier U1B, the input end of the third voltage-dividing branch 11 is electrically connected to the processor 4, the output end of the third voltage-dividing branch 11 is connected to the in-phase input end of the second operational amplifier U1B, the first input end of the second negative feedback branch 12 is connected to the output end of the second operational amplifier U1B, the second input end of the second negative feedback branch 12 is connected to the inverting input end of the second operational amplifier U1B, the output end of the second negative feedback branch 12 is grounded, and the output end of the second operational amplifier U1B is used to connect the charging load 5.

[0066] Preferably, the resistance value of the resistor R5 in the third voltage-dividing branch 11 is the same as the resistance value of the resistor R12 in the second negative feedback branch 12, and the resistance value of the resistor R8 in the third voltage-dividing branch 11 is the same as the resistance value of the resistor R11 in the second negative feedback branch 12, forming differential amplification.

[0067] The working process of the diode detection circuit of the above-mentioned charging pile control guidance circuit is: the signal output by the processor 4 flows to the non-inverting input terminal of the second operational amplifier U1B through the third voltage divider branch 11, and the second negative feedback branch 12 transmits the signal at the output terminal of the second operational amplifier U1B to the inverting input terminal of the second operational amplifier U1B. The second operational amplifier U1B adjusts the signal at its non-inverting input terminal according to the signal at its inverting input terminal, and transmits it to the charging load 5.

[0068] The diode detection circuit of the charging pile control pilot circuit of this embodiment is provided with a second operational amplifier U1B in the differential amplifier circuit 1 for differential amplification. The operational amplifier has an extremely high voltage gain, which can ensure the accurate transmission of the signal, and has a high impedance, which will not cause a load effect on the signal, thereby greatly improving the reliability of the circuit.

[0069] In one embodiment, a charging pile control steering circuit is provided, and the charging pile control steering circuit includes the diode detection circuit of the control steering circuit mentioned in any of the above embodiments.

[0070] The embodiments described above are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention, and should be included in the protection scope of the present invention.

Claims

1. A diode detection circuit for a charging pile control pilot circuit, characterized in that: include: A differential amplifier circuit, a control guidance signal acquisition circuit and a reference source circuit, wherein the input end of the differential amplifier circuit is electrically connected to the processor, the output end of the differential amplifier circuit is used to connect to the charging load, and the differential amplifier circuit is used to differentially amplify the control guidance signal output by the processor; The first input end of the control guide signal acquisition circuit is connected to the charging load, the second input end of the control guide signal acquisition circuit is connected to the output end of the reference source circuit, the output end of the control guide signal acquisition circuit is electrically connected to the processor, a reference voltage source is serially connected in the reference source circuit, the input end of the reference source circuit is connected to a first power supply, and the control guide signal acquisition circuit is used to obtain the signal of the charging load, and convert the signal of the charging load according to the reference source circuit and transmit it to the processor.

2. The diode detection circuit of the charging pile control pilot circuit according to claim 1, characterized in that: The reference source circuit also includes: a first voltage divider branch, the input end of the first voltage divider branch is connected to the first power supply, the first output end of the first voltage divider branch is connected to the reference signal end of the reference voltage source, the second output end of the first voltage divider branch is grounded, the input end of the reference voltage source is grounded, the output end of the reference voltage source is connected to the input end of the first voltage divider branch, and the output end of the reference voltage source is connected to the second input end of the control guidance signal acquisition circuit.

3. The diode detection circuit of the charging pile control pilot circuit according to claim 2, characterized in that: The reference source circuit further includes: a filter branch, one end of which is connected to the input end of the reference voltage source, and the other end of which is connected to the output end of the reference voltage source.

4. The diode detection circuit of the charging pile control pilot circuit according to claim 3, characterized in that: The model of the reference voltage source is TL431.

5. The diode detection circuit of the charging pile control pilot circuit according to claim 1, characterized in that: The diode detection circuit also includes: a switch control circuit, wherein the input end of the switch control circuit is connected to the output end of the differential amplifier circuit, the output end of the switch control circuit is connected to the charging load, and the control end of the switch control circuit is electrically connected to the processor.

6. The diode detection circuit of the charging pile control pilot circuit according to claim 5, characterized in that: The switch control circuit includes: a first switch branch and a second switch branch, the input end of the first switch branch is connected to the control end of the second switch branch, the output end of the first switch branch is grounded, the control end of the first switch branch is electrically connected to the processor, the input end of the second switch branch is connected to the output end of the differential amplifier circuit, and the output end of the second switch branch is used to connect the charging load.

7. The diode detection circuit of the charging pile control pilot circuit according to claim 6, characterized in that: The second switch branch includes: a relay and a protection branch, the first coil end of the relay is connected to the first power supply, the second coil end of the relay is connected to the input end of the first switch branch, the normally open end of the relay is connected to the output end of the differential amplifier circuit, the common end of the relay is connected to the charging load, the input end of the protection branch is connected to the second coil end of the relay, and the output end of the protection branch is connected to the first power supply.

8. The diode detection circuit of the charging pile control pilot circuit according to claim 1, characterized in that: The control guidance signal acquisition circuit includes: a second voltage-dividing branch, a first negative feedback branch and a first operational amplifier, the input end of the second voltage-dividing branch is electrically connected to the charging load, the output end of the second voltage-dividing branch is connected to the non-inverting input end of the first operational amplifier, the first input end of the first negative feedback branch is connected to the output end of the reference source circuit, the second input end of the first negative feedback branch is connected to the output end of the first operational amplifier, the output end of the first negative feedback branch is connected to the inverting input end of the first operational amplifier, and the output end of the first operational amplifier is electrically connected to the processor.

9. The diode detection circuit of the charging pile control pilot circuit according to claim 1, characterized in that: The differential amplifier circuit includes: a third voltage-dividing branch, a second negative feedback branch, and a second operational amplifier, the input end of the third voltage-dividing branch is electrically connected to the processor, the output end of the third voltage-dividing branch is connected to the non-inverting input end of the second operational amplifier, the first input end of the second negative feedback branch is connected to the output end of the second operational amplifier, the second input end of the second negative feedback branch is connected to the inverting input end of the second operational amplifier, the output end of the second negative feedback branch is grounded, and the output end of the second operational amplifier is used to connect a charging load.

10. A charging pile control guidance circuit, characterized in that: The charging pile control steering circuit includes a diode detection circuit of the control steering circuit described in any one of claims 1-9.

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