CP signal transmission circuit system

Abstract

The utility model provides a CP signal transmission circuit system which comprises a pile end module and a vehicle end module, the pile end module comprises a charging pile control panel and a power supply equipment communication controller, the charging pile control panel is in CAN communication with the power supply equipment communication controller, and the vehicle end module comprises an electric vehicle communication controller. The power supply equipment communication controller communicates with an electric vehicle communication controller PLC, a CP signal generation circuit is arranged in the power supply equipment communication controller and comprises an MCU, a signal amplification circuit and a push-pull follower circuit, and a PWM signal output by the MCU is input to the push-pull follower circuit after being amplified by the signal amplification circuit; and the amplified PWM signal is converted into a CP signal through a push-pull follower circuit, and the CP signal is output to an electric vehicle communication controller, wherein the CP signal is a + / -12V power line carrier signal. According to the CP signal transmission circuit system disclosed by the invention, the power line carrier signal with the PWM waveform of + / -12V can be generated to perform charging information interaction with the vehicle end module, so that a charging pile communication function based on PLC communication with the vehicle end module is realized.

Description

Technical Field

[0001] The utility model relates to the technical field of charging control, in particular to a CP (control pilot) signal transmission circuit system. Background Art

[0002] When the charging pile is charging the electric vehicle, the charging pile and the electric vehicle exchange charging information through the CP (control pilot) signal. With the vigorous development of electric vehicles, the number of domestic cars exported to overseas markets in Europe and the United States is increasing. Domestic charging piles use CAN communication, while the European and American charging standards use power line communication (PLC) communication. In order to achieve the conversion of vehicle communication protocols, such as the case where the national standard pile charges the European and American standard electric vehicles, the output design of the pile end CP (control pilot) signal is particularly important. In the prior art, the circuit design for the interaction between the charging pile and the electric vehicle through the CP signal is relatively complex, and the number of components used is also large. The signal transmission is unstable, which not only increases the production cost, but also is not conducive to subsequent maintenance. Utility Model Content

[0003] In view of the above problems in the prior art, the present disclosure aims to provide a CP signal transmission circuit system, comprising:

[0004] A pile-end module and a vehicle-end module, wherein the pile-end module comprises a charging pile control board and a power supply equipment communication controller, wherein the charging pile control board communicates with the power supply equipment communication controller CAN, and the vehicle-end module comprises an electric vehicle communication controller, wherein the power supply equipment communication controller communicates with the electric vehicle communication controller PLC, and a CP signal generating circuit is arranged in the power supply equipment communication controller, wherein the CP signal generating circuit comprises an MCU, a signal amplifying circuit and a push-pull follower circuit, wherein the signal output end of the MCU is connected to the input end of the signal amplifying circuit, and the output end of the signal amplifying circuit is connected to the input end of the push-pull follower circuit, and the PWM signal output by the MCU is amplified by the signal amplifying circuit and then input into the push-pull follower circuit, and the amplified PWM signal is converted into a CP signal by the push-pull follower circuit and output to the electric vehicle communication controller, and the CP signal is a ±12V power carrier signal.

[0005] Preferably, the vehicle-end module further includes a BMS module, and the BMS module communicates with the electric vehicle communication controller CAN.

[0006] Preferably, the electric vehicle communication controller is provided with an EVCC control chip and a PLC signal encoding and decoding module, the PLC signal encoding and decoding module is used to decode and encode the CP signal and send it to the EVCC control chip, and the EVCC control chip is used to communicate the converted CP signal with the BMS module via CAN.

[0007] Preferably, the signal amplification circuit includes a first operational comparison amplifier U9A, the non-inverting input terminal of the first operational comparison amplifier is connected to the PWM signal, the inverting input terminal of the first operational comparison amplifier is connected to the first reference voltage, the positive power supply terminal of the first operational comparison amplifier is connected to the positive power supply voltage VCC1, the negative power supply terminal of the first operational comparison amplifier is connected to the negative power supply voltage VCC2, and the output terminal of the first operational comparison amplifier is connected to the input terminal of the push-pull follower circuit.

[0008] Preferably, the push-pull follower circuit includes a first transistor and a second transistor, the bases of the first transistor and the second transistor are both connected to the output end of the first operational comparison amplifier, the emitters of the first transistor and the second transistor are both connected to the CP signal input end of the electric vehicle communication controller, the collector of the first transistor is connected to the positive driving voltage VCC3, and the collector of the second transistor is connected to the negative driving voltage VCC4.

[0009] Preferably, it also includes a first pull-up resistor and a second pull-up resistor, the second pull-up resistor is connected between the connection point of the base of the first transistor and the second transistor and the output end of the first operational comparison amplifier, one end of the first pull-up resistor is connected between the second pull-up resistor and the output end of the first operational comparison amplifier, and the other end is connected to the pull-up voltage VCC5.

[0010] Preferably, a first filtering capacitor component connected to ground is provided between the inverting input terminal of the first operational comparison amplifier and the positive power supply voltage VCC1.

[0011] Preferably, a second filtering capacitor component connected to ground is provided between the non-inverting input terminal of the first operational comparison amplifier and the negative power supply voltage VCC2.

[0012] Preferably, a filter circuit is further provided between the connection point of the emitters of the first transistor and the second transistor and the CP signal input terminal, and the filter circuit includes a first diode and a filter capacitor which are provided in parallel with the ground.

[0013] According to the CP signal transmission circuit system disclosed in the present invention, the components used in the CP signal generation circuit are simple and low-cost. The PWM square wave signal output by the MCU can be converted into a square wave signal with a swing of ±12.6V through a signal amplification circuit, and then a ±12V precise square wave signal is formed through the voltage drop of NPN and PNP transistors (the transistor itself has a voltage drop of 0.6V), which is more in line with the PLC communication standard. The push-pull follower circuit formed by the upper P and lower N type dual transistors has a better signal enhancement effect and improves the signal stability, thereby realizing the charging pile communication function based on PLC communication with the vehicle-side module, ensuring the smooth charging process. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present disclosure. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0015] Figure 1 It is a structural block diagram of the CP signal transmission circuit system of the preferred embodiment of the present disclosure.

[0016] Figure 2 This is the schematic diagram of the CP signal generation circuit. DETAILED DESCRIPTION

[0017] The preferred embodiments of the present disclosure are described below in conjunction with the drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present disclosure, and are not used to limit the present disclosure. In addition, the embodiments and features in the embodiments of the present disclosure may be combined with each other if no conflict occurs.

[0018] like Figure 1 As shown, the present disclosure provides a CP (control pilot) signal transmission circuit system of a preferred embodiment, comprising:

[0019] The pile-end module 100 and the vehicle-end module 200, the pile-end module 100 includes a charging pile control board 101 and a power supply equipment communication controller 102, the charging pile control board 101 communicates with the power supply equipment communication controller 102 via CAN, the vehicle-end module 200 includes an electric vehicle communication controller 201, the power supply equipment communication controller 102 communicates with the electric vehicle communication controller 201 via PLC, a CP signal generating circuit 103 is provided in the power supply equipment communication controller 102, the CP signal generating circuit includes an MCU (Micro-controller Unit), a signal amplifying circuit and a push-pull follower circuit, the signal output end of the MCU is connected to the input end of the signal amplifying circuit, the output end of the signal amplifying circuit is connected to the input end of the push-pull follower circuit, the PWM (Pulse Width Modulation) signal output by the MCU is amplified by the signal amplifying circuit and input into the push-pull follower circuit, the amplified PWM signal is converted into a CP signal via the push-pull follower circuit and output to the electric vehicle communication controller 201, the CP signal is a ±12V power carrier signal.

[0020] Therefore, according to the CP signal transmission circuit system disclosed in the present invention, a power carrier signal with a ±12V PWM waveform can be generated to interact with the vehicle-end module for charging information, thereby realizing a charging pile communication function based on PLC communication with the vehicle-end module 200.

[0021] In some embodiments, the vehicle-end module 200 may further include a BMS (Battery Management System) module 202, and the BMS module 202 communicates with the electric vehicle communication controller 201 via CAN. Therefore, after the power carrier signal of the ±12V PWM waveform is processed by the electric vehicle communication controller 201, it can communicate with the BMS module 202 via CAN, thereby realizing the charging information interaction between the pile-end module 100 and the vehicle-end module 200.

[0022] In some embodiments, the electric vehicle communication controller 201 is provided with an EVCC (Electric Vehicle Communication Controller) control chip 203 and a PLC signal encoding and decoding module 204. The PLC signal encoding and decoding module 204 is used to decode and encode the CP signal (a power carrier signal with a ±12V PWM waveform) and send it to the EVCC control chip 203. The EVCC control chip is used to communicate the converted CP signal with the BMS module 202 via CAN.

[0023] Specifically, Figure 2As shown, the signal amplification circuit includes a first operational comparison amplifier U9A, the in-phase input terminal of the first operational comparison amplifier U9A is connected to the PWM signal output by the MCU, the inverting input terminal of the first operational comparison amplifier U9A is connected to the first reference voltage, the positive power supply terminal of the first operational comparison amplifier U9A is connected to the positive power supply voltage VCC1, the negative power supply terminal of the first operational comparison amplifier U9A is connected to the negative power supply voltage VCC2, and the output terminal of the first operational comparison amplifier U9A is connected to the input terminal of the push-pull follower circuit. In this embodiment, the positive power supply voltage VCC1 is set to +12.6V; the negative power supply voltage VCC2 is set to -12.6V.

[0024] Specifically, Figure 2 As shown, the push-pull follower circuit includes a first transistor Q13 and a second transistor Q14, the bases of the first transistor Q13 and the second transistor Q14 are both connected to the output end of the first operational comparison amplifier U9A, the emitters of the first transistor Q13 and the second transistor Q14 are both connected to the CP signal input end of the electric vehicle communication controller 201, the collector of the first transistor Q13 is connected to the positive drive voltage VCC3, and the collector of the second transistor Q14 is connected to the negative drive voltage VCC4. In this embodiment, the positive drive voltage VCC3 is set to +12.6V; the negative drive voltage VCC4 is set to -12.6V. In this embodiment, the first transistor Q13 adopts an NPN transistor, and the second transistor Q14 adopts a PNP transistor.

[0025] like Figure 2 As shown, the CP signal generating circuit further includes a first pull-up resistor R17 and a second pull-up resistor R19, the second pull-up resistor R19 is connected between the connection point of the base of the first transistor Q13 and the second transistor Q14 and the output end of the first operational comparison amplifier U9A, one end of the first pull-up resistor R17 is connected between the second pull-up resistor R19 and the output end of the first operational comparison amplifier U9A, and the other end is connected to the pull-up voltage VCC5. In this embodiment, the pull-up voltage VCC5 is set to +12.6V.

[0026] like Figure 2 As shown, a first filter capacitor component connected to ground is provided between the inverting input terminal of the first operational comparison amplifier U9A and the positive power supply voltage VCC1. The first filter capacitor component includes a capacitor C127 and a capacitor C128 connected in parallel.

[0027] like Figure 2 As shown, a second filter capacitor component connected to ground is also provided between the non-inverting input terminal of the first operational comparison amplifier U9A and the negative power supply voltage VCC2. The first filter capacitor component includes a capacitor C124 and a capacitor C125 connected in parallel.

[0028] like Figure 2As shown, a filter circuit is also provided between the connection point of the emitters of the first transistor Q13 and the second transistor Q14 and the CP signal input terminal of the electric vehicle communication controller 201 , and the filter circuit includes a first diode D23 and a filter capacitor C126 provided in parallel to the ground.

[0029] According to the CP signal transmission circuit system disclosed in the present invention, the components used in the CP signal generation circuit are simple and low-cost. The PWM square wave signal output by the MCU can be converted into a square wave signal with a swing of ±12.6V through a signal amplification circuit, and then a ±12V precise square wave signal is formed through the voltage drop of NPN and PNP transistors (the transistor itself has a voltage drop of 0.6V), which is more in line with the PLC communication standard. The push-pull follower circuit formed by the upper P and lower N type dual transistors has a better signal enhancement effect and improves the signal stability, thereby realizing the charging pile communication function based on PLC communication with the vehicle-side module, ensuring the smooth charging process.

[0030] Although the preferred embodiments of the present disclosure have been described, those skilled in the art may make additional changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications falling within the scope of the present disclosure.

[0031] Obviously, those skilled in the art can make various changes and modifications to the embodiments of the present disclosure without departing from the spirit and scope of the embodiments of the present disclosure. Thus, if these modifications and variations of the embodiments of the present disclosure fall within the scope of the claims of the present disclosure and their equivalents, the present disclosure is also intended to include these modifications and variations.

[0032] It should also be understood that in the embodiments of this article, the term "and / or" is only a description of the association relationship of the associated objects, indicating that three relationships may exist. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0033] Those of ordinary skill in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of the two. In order to clearly illustrate the interchangeability of hardware and software, the composition and steps of each example have been generally described in terms of function in the above description. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of this article.

[0034] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working processes of the systems, devices and units described above can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0035] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the embodiments of this article.

[0036] In addition, each functional unit in each embodiment of this invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above integrated unit may be implemented in the form of hardware or in the form of software functional unit.

[0037] Specific embodiments are used in this article to illustrate the principles and implementation methods of this article. The description of the above embodiments is only used to help understand the methods and core ideas of this article. At the same time, for general technicians in this field, according to the ideas of this article, there will be changes in the specific implementation methods and application scopes. In summary, the content of this specification should not be understood as a limitation on this article.

Claims

1. A CP signal transmission circuit system, characterized in that: It includes a pile-end module and a vehicle-end module, the pile-end module includes a charging pile control board and a power supply equipment communication controller, the charging pile control board communicates with the power supply equipment communication controller CAN, the vehicle-end module includes an electric vehicle communication controller, the power supply equipment communication controller communicates with the electric vehicle communication controller PLC, a CP signal generating circuit is provided in the power supply equipment communication controller, the CP signal generating circuit includes an MCU, a signal amplifying circuit and a push-pull follower circuit, the signal output end of the MCU is connected to the input end of the signal amplifying circuit, the output end of the signal amplifying circuit is connected to the input end of the push-pull follower circuit, the PWM signal output by the MCU is amplified by the signal amplifying circuit and then input into the push-pull follower circuit, the amplified PWM signal is converted into a CP signal by the push-pull follower circuit and output to the electric vehicle communication controller, and the CP signal is a ±12V power carrier signal.

2. The CP signal transmission circuit system according to claim 1, characterized in that: The vehicle-end module also includes a BMS module, and the BMS module communicates with the electric vehicle communication controller CAN.

3. The CP signal transmission circuit system according to claim 2, characterized in that: The electric vehicle communication controller is provided with an EVCC control chip and a PLC signal encoding and decoding module. The PLC signal encoding and decoding module is used to decode and encode the CP signal and send it to the EVCC control chip. The EVCC control chip is used to communicate the converted CP signal with the BMS module CAN.

4. The CP signal transmission circuit system according to claim 1, characterized in that: The signal amplification circuit includes a first operational comparison amplifier, a non-inverting input terminal of the first operational comparison amplifier is connected to the PWM signal, an inverting input terminal of the first operational comparison amplifier is connected to a first reference voltage, a positive power supply terminal of the first operational comparison amplifier is connected to a positive power supply voltage VCC1, a negative power supply terminal of the first operational comparison amplifier is connected to a negative power supply voltage VCC2, and an output terminal of the first operational comparison amplifier is connected to an input terminal of the push-pull follower circuit.

5. The CP signal transmission circuit system according to claim 4, characterized in that: The push-pull follower circuit includes a first transistor and a second transistor, the bases of the first transistor and the second transistor are both connected to the output end of the first operational comparison amplifier, the emitters of the first transistor and the second transistor are both connected to the CP signal input end of the electric vehicle communication controller, the collector of the first transistor is connected to the positive driving voltage VCC3, and the collector of the second transistor is connected to the negative driving voltage VCC4.

6. The CP signal transmission circuit system according to claim 5, characterized in that: It also includes a first pull-up resistor and a second pull-up resistor, the second pull-up resistor is connected between the connection point of the bases of the first transistor and the second transistor and the output end of the first operational comparison amplifier, one end of the first pull-up resistor is connected between the second pull-up resistor and the output end of the first operational comparison amplifier, and the other end is connected to the pull-up voltage VCC5.

7. The CP signal transmission circuit system according to claim 5, characterized in that: A first filtering capacitor component to ground is also provided between the inverting input terminal of the first operational comparison amplifier and the positive power supply voltage VCC1.

8. The CP signal transmission circuit system according to claim 5, characterized in that: A second filtering capacitor component to ground is also provided between the non-inverting input terminal of the first operational comparison amplifier and the negative power supply voltage VCC2.

9. The CP signal transmission circuit system according to claim 5, characterized in that: A filter circuit is further arranged between the connection point of the emitters of the first transistor and the second transistor and the CP signal input terminal, and the filter circuit includes a first diode and a filter capacitor arranged in parallel to the ground.

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