European standard DC charging pile SECC communication control system

Abstract

The utility model relates to a European standard DC charging pile SECC communication control system, which comprises a display screen billing unit, a DC charging controller and an SECC communication controller, and is characterized in that the DC charging controller comprises a single-chip microcomputer MCU control circuit, a CAN2 bus and EMC protection circuit and a CAN2 second interface; the SECC communication controller comprises a single-chip microcomputer MCU circuit, a PWM square wave generation circuit, a CP signal control conditioning circuit, a CP signal filter circuit, a CP connection charging cable interface, a CP signal reverse amplification circuit, a CP signal protection circuit, a PLC conversion circuit, a CAN1 bus and EMC protection circuit and a CAN1 first interface. According to the system, the complexity of an internal system of the direct-current charging pile and a harsh external use environment are fully considered, and the related communication circuit and power supply circuit are fully isolated, so that mutual interference inside the direct-current charging pile system is prevented, and meanwhile, mutual interference between a vehicle and an external system is isolated.

Description

Technical Field

[0001] The utility model relates to the technical field of charging piles, and more specifically to a European standard DC charging pile SECC communication control system. Background Art

[0002] With the rapid development of the DC charging pile industry, the market has more and more functional requirements for DC charging piles, and the system has become more and more complex, resulting in increasing interference from the system, especially electromagnetic interference.

[0003] At present, the SECC communication controllers of European standard DC charging piles on the market integrate a large number of complex functions, including Ethernet, 4G functions, DDR high-speed circuits, etc., resulting in disadvantages such as cumbersome and redundant hardware and software and high costs. In addition, the CP signal of the SECC communication controller exists in the form of pulse width modulation (PWM) square waves during the charging process. The pulse width modulation (PWM) signal can easily cause oscillation or crosstalk with high-speed signals such as DDR and Ethernet, and interference such as radiation, conduction, ESD, and EFT can be infinitely amplified, making the design more difficult. At the same time, the PLC signal level attenuation characteristic (SLAC) of the traditional SECC communication controller is poor, and the signal attenuation is serious. Most traditional CP circuits use multi-stage transistor push-pull circuits, which have large voltage drop, slow speed, and poor signal quality. In addition, the single-chip microcomputer cannot detect -12V, which does not meet the European standard requirement that the CP signal needs to detect -12V. The utility model proposes a new solution to the above problems. Summary of the Invention

[0004] In view of the problems existing in the prior art, the purpose of the present invention is to provide a European standard DC charging pile SECC communication control system to solve the technical problems mentioned in the background technology.

[0005] In order to solve the above problems, the present invention adopts the following technical solutions.

[0006] A European standard DC charging pile SECC communication control system includes a display billing unit, a DC charging controller and a SECC communication controller, wherein the DC charging controller includes a single-chip microcomputer MCU control circuit, a CAN2 bus and EMC protection circuit, and a CAN2 second interface, wherein the CAN2 second interface is connected to the CAN2 bus and EMC protection circuit, the CAN2 bus and EMC protection circuit are connected to the single-chip microcomputer MCU control circuit, and the CAN2 second interface is connected to the display billing unit, wherein

[0007] The SECC communication controller includes a single-chip microcomputer MCU circuit, a PWM square wave generating circuit, a CP signal control conditioning circuit, a CP signal filtering circuit, a CP connection charging cable interface, a CP signal reverse amplification circuit, a CP signal protection circuit, a PLC conversion circuit, a CAN1 bus and EMC protection circuit, and a CAN1 first interface. The single-chip microcomputer MCU circuit is connected to the PWM square wave generating circuit, the PWM square wave generating circuit is sequentially connected to the CP signal control conditioning circuit and the CP signal filtering circuit, and the pulse width modulated PWM signal passing through the CP signal filtering circuit is connected to the CP connection charging cable interface; at the same time, the pulse width modulated PWM signal passing through the CP signal filtering circuit is also connected to the CP signal reverse amplification circuit, and the CP signal reverse amplification circuit is connected to the CP signal protection circuit; in addition, the pulse width modulated PWM signal passing through the CP signal filtering circuit is also connected to the PLC conversion circuit; the single-chip microcomputer MCU circuit is sequentially connected to the CAN1 bus and EMC protection circuit and the CAN1 first interface, and the CAN1 first interface is connected to the CAN2 second interface.

[0008] Preferably, the CAN1 chip is a CAN transceiver chip, and an EMC protection component is added between the CAN1 bus and the CAN1 first interface, and the EMC protection component includes a surge suppressor, a PTC and a TVS tube.

[0009] In any of the above solutions, preferably, the PLC chip models of the PLC conversion circuit are MSE1021 and MSEX24-i.

[0010] In any of the above solutions, preferably, the PLC conversion circuit is connected to a single-chip microcomputer MCU circuit.

[0011] In any of the above solutions, preferably, the reverse amplifier circuit provides a detection + / -12V level.

[0012] Compared with the prior art, the advantages of the present invention are:

[0013] 1. The system fully considers the complexity of the internal system of the DC charging pile and the harsh external operating environment. The communication circuits and power circuits involved are fully isolated, which not only prevents mutual interference within the DC charging pile system, but also isolates the mutual interference between the vehicle and the external system.

[0014] 2. The PWM square wave generating circuit and CP signal control and regulation circuit fully consider the time of the rising and falling edges of the signal, with less voltage drop and fast speed, which improves the quality of signal transmission and enhances the EMC anti-interference ability. At the same time, it overcomes the shortcomings of traditional circuits that do not consider the time of the rising and falling edges of the signal, have slow speed, and inaccurate signal detection.

[0015] 3. The voltage level of the CP signal is detected by a high-performance ADC, the status of the CP signal voltage is monitored, and the precise adjustment of the PWM signal increases the stability of the rectification charging sequence. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the overall structure of a European standard DC charging pile SECC communication control system of the utility model;

[0017] Figure 2 This is the principle block diagram of the SECC communication controller;

[0018] Figure 3 This is the functional block diagram of the DC charging controller. DETAILED DESCRIPTION

[0019] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention; it is obvious that the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention. Example

[0020] See also Figures 1 to 3 A European standard DC charging pile SECC communication control system includes a display billing unit, a DC charging controller and a SECC communication controller, wherein the DC charging controller includes a single-chip MCU control circuit, a CAN2 bus and EMC protection circuit, and a CAN2 second interface. The CAN2 second interface is connected to the CAN2 bus and EMC protection circuit, the CAN2 bus and EMC protection circuit are connected to the single-chip MCU control circuit, and the CAN2 second interface is connected to the display billing unit.

[0021] The SECC communication controller includes a single-chip microcomputer MCU circuit, a PWM square wave generating circuit, a CP signal control conditioning circuit, a CP signal filtering circuit, a CP connection charging cable interface, a CP signal reverse amplification circuit, a CP signal protection circuit, a PLC conversion circuit, a CAN1 bus and EMC protection circuit, and a CAN1 first interface. The single-chip microcomputer MCU circuit is connected to the PWM square wave generating circuit, which is in turn connected to the CP signal control conditioning circuit and the CP signal filtering circuit. The pulse width modulated PWM signal passing through the CP signal filtering circuit is connected to the CP connection charging cable interface; at the same time, the pulse width modulated PWM signal passing through the CP signal filtering circuit is also connected to the CP signal reverse amplification circuit, which is connected to the CP signal protection circuit; in addition, the pulse width modulated PWM signal passing through the CP signal filtering circuit is also connected to the PLC conversion circuit; the single-chip microcomputer MCU circuit is connected to the CAN1 bus and EMC protection circuit, the CAN1 first interface, and the CAN1 first interface is connected to the CAN2 second interface.

[0022] In this embodiment, the CAN1 chip is a CAN transceiver chip, and an EMC protection component is added between the CAN1 bus and the CAN1 first interface. The EMC protection component includes a surge suppressor, a PTC, and a TVS tube.

[0023] In this embodiment, the PLC chip models of the PLC conversion circuit are MSE1021 and MSEX24-i.

[0024] In this embodiment, the PLC conversion circuit is connected to the single chip microcomputer MCU circuit.

[0025] In this embodiment, the inverting amplifier circuit provides detection of + / -12V level.

[0026] The working process of this utility model is as follows:

[0027] The MCU circuit is connected to the PWM square wave generation circuit. The MCU outputs a 1kHz 3.3V pulse-width modulated PWM square wave with a stable level and different amplitude and duty cycles. This pulse-width modulated PWM square wave complies with the IEC 61851-1 standard. The PWM square wave generation circuit is sequentially connected to the CP signal control conditioning circuit and the CP signal filtering circuit. Through transistor level conversion, NOT gate conversion control, and push-pull, it outputs a complete, standard-compliant level signal. At the same time, the CP signal filtering circuit filters the CP circuit and outputs a stable, fast pulse-width modulated PWM signal with short rising and falling edge times. The pulse-width modulated PWM signal after the CP signal filtering circuit is connected to the CP charging cable interface, connected to the vehicle end, and directly communicates with the electric vehicle via the charging cable.

[0028] At the same time, the pulse width modulated PWM signal that has passed through the CP signal filtering circuit is also connected to the CP signal reverse amplifier circuit. The reverse amplifier circuit reversely amplifies and conditions the 1K Hz square wave signal with different amplitude duty cycles into a complete level signal that meets the PWM detection requirements of the single-chip microcomputer, and the reverse amplifier circuit can provide detection of + / -12V level; the CP signal reverse amplifier circuit is connected to the CP signal protection circuit, and the complete level signal output by the reverse amplifier circuit is protected by the clamping diode and the electrostatic tube and then connected to the single-chip microcomputer for PWM detection; at the same time, the pulse width modulated PWM signal that has passed through the CP signal filtering circuit is also connected to the PLC conversion circuit. The pulse width modulated PWM signal passes through the PLC coupling transformer in the PLC conversion circuit and differentially enters the PLC chip for data interaction. The PLC chip models of the PLC conversion circuit are MSE1021 and MSEX24-i, which are used in the SECC communication controller at the European standard DC charging pile end; the PLC conversion circuit is connected to the single-chip microcomputer MCU circuit, and transmits the PLC data signal or protocol to the single-chip microcomputer through SPI information data interaction;

[0029] The single-chip microcomputer MCU circuit is connected to the CAN1 bus and the EMC protection circuit and the CAN1 first interface in sequence. The CAN1 first interface is connected to the CAN2 second interface in the DC charging controller principle block diagram. The single-chip microcomputer transmits the PLC data signal or protocol to communicate bidirectionally with the DC charging controller through the CAN bus. The CAN1 chip is a CAN transceiver chip. EMC protection components, including surge suppressors, PTCs, and TVS tubes, are added between the CAN1 bus and the CAN1 first interface to prevent the CAN1 chip from being damaged by static electricity and surge interference, improve anti-interference capability and performance, and ensure the stability of communication between the CAN1 bus and the CAN2 bus.

[0030] like Figure 3 The DC charging controller's functional block diagram includes the MCU control circuit, the CAN2 bus and EMC protection circuit, and the CAN2 second interface. The DC charging controller's CAN2 second interface is connected to the CAN1 first interface, which in turn is connected to the CAN2 bus and EMC protection circuit, which in turn is connected to the MCU control circuit. The CAN2 chip is a CAN transceiver chip. EMC protection components, including a surge suppressor, PTC, and TVS diode, are added between the CAN2 bus and the CAN2 first interface to protect the CAN2 chip from static electricity and surge interference, improving its anti-interference capability and performance and ensuring stable communication between the CAN2 and CAN1 buses.

[0031] like Figure 1 The CAN2 second interface of the DC charging controller is connected to the display screen billing unit, and two-way communication between the DC charging controller and the display screen billing unit is realized through the CAN2 bus.

[0032] 1. The SECC communication control system of the European standard DC charging pile fully considers the complexity of the internal system of the DC charging pile and the harsh external operating environment. The communication circuit and power circuit involved are fully isolated, which not only prevents mutual interference within the DC charging pile system, but also isolates the mutual interference between the vehicle and the external system.

[0033] 2. The PWM square wave generating circuit and CP signal control and regulation circuit fully consider the time of the rising and falling edges of the signal, with less voltage drop and fast speed, which improves the quality of signal transmission and enhances the EMC anti-interference ability. At the same time, it overcomes the shortcomings of traditional circuits that do not consider the time of the rising and falling edges of the signal, have slow speed, and inaccurate signal detection.

[0034] 3. The voltage level of the CP signal is detected by a high-performance ADC, the status of the CP signal voltage is monitored, and the precise adjustment of the PWM signal increases the stability of the rectification charging sequence.

[0035] 4. Since the CP signal is a pulse width modulation (PWM) signal, it is easy to generate radiation and conduction interference and emit it outward. The system adds a filtering circuit to the CP signal and suppresses the radiation and conduction interference at the power supply, thereby improving the EMC performance of the system.

[0036] 5. The system fully considers the PLC signal level attenuation characteristics (SLAC), especially the data conversion between the PLC conversion circuit and the CP circuit, and adjusts the PLC signal and the CP signal. The PLC signal level attenuation characteristics (SLAC) are good, which not only ensures that the PLC signal level attenuation characteristics (SLAC) comply with the relevant standards of ISO 15118 / DIN 70121, but also ensures the quality of the CP signal.

[0037] The above description is merely a preferred embodiment of the present invention; however, the scope of protection of the present invention is not limited thereto. Any person skilled in the art who, within the technical scope disclosed in the present invention, makes equivalent substitutions or modifications based on the technical solutions and improved concepts of the present invention shall be covered by the scope of protection of the present invention.

Claims

1. A European standard DC charging pile SECC communication control system, characterized by: It includes a display billing unit, a DC charging controller and a SECC communication controller, wherein the DC charging controller includes a single-chip microcomputer MCU control circuit, a CAN2 bus and EMC protection circuit, and a CAN2 second interface. The CAN2 second interface is connected to the CAN2 bus and EMC protection circuit, the CAN2 bus and EMC protection circuit are connected to the single-chip microcomputer MCU control circuit, and the CAN2 second interface is connected to the display billing unit. The SECC communication controller includes a single-chip microcomputer MCU circuit, a PWM square wave generating circuit, a CP signal control conditioning circuit, a CP signal filtering circuit, a CP connection charging cable interface, a CP signal reverse amplification circuit, a CP signal protection circuit, a PLC conversion circuit, a CAN1 bus and EMC protection circuit, and a CAN1 first interface. The single-chip microcomputer MCU circuit is connected to the PWM square wave generating circuit, the PWM square wave generating circuit is sequentially connected to the CP signal control conditioning circuit and the CP signal filtering circuit, and the pulse width modulated PWM signal passing through the CP signal filtering circuit is connected to the CP connection charging cable interface; at the same time, the pulse width modulated PWM signal passing through the CP signal filtering circuit is also connected to the CP signal reverse amplification circuit, and the CP signal reverse amplification circuit is connected to the CP signal protection circuit; in addition, the pulse width modulated PWM signal passing through the CP signal filtering circuit is also connected to the PLC conversion circuit; the single-chip microcomputer MCU circuit is sequentially connected to the CAN1 bus and EMC protection circuit and the CAN1 first interface, and the CAN1 first interface is connected to the CAN2 second interface.

2. A European standard DC charging pile SECC communication control system according to claim 1, characterized in that: The CAN1 chip is a CAN transceiver chip, and an EMC protection component is added between the CAN1 bus and the CAN1 first interface. The EMC protection component includes a surge suppressor, a PTC and a TVS tube.

3. A European standard DC charging pile SECC communication control system according to claim 2, characterized in that: The PLC chip models of the PLC conversion circuit are MSE1021 and MSEX24-i.

4. A European standard DC charging pile SECC communication control system according to claim 3, characterized in that: The PLC conversion circuit is connected to the single chip microcomputer MCU circuit.

5. A European standard DC charging pile SECC communication control system according to claim 4, characterized in that: The inverting amplifier circuit provides detection of + / -12V level.

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