CN210617896U

CN210617896U - DC charging controller

Info

Publication number: CN210617896U
Application number: CN201921162182.7U
Authority: CN
Inventors: 邓永辉; 刘得付; 郭中高; 黄兴华; 瞿俊; 杨士雄; 黄燕明; 吴宇灿; 洪铭; 吴楚; 陈松涛
Original assignee: Shenzhen Qihui Electrical Co ltd
Current assignee: Shenzhen jinqihui Electric Co.,Ltd.
Priority date: 2019-07-23
Filing date: 2019-07-23
Publication date: 2020-05-26
Anticipated expiration: 2029-07-23

Abstract

The utility model discloses a direct current charge controller, include: the system comprises a controller main control unit, a charging control unit, a direct current power supply module and at least one analog CAN bus unit; the charging control unit and the direct current power supply module are respectively connected with a CAN bus interface of the controller main control unit; the simulation CAN bus unit is connected with a serial peripheral interface of the controller main control unit and is used for simulating a CAN bus interface of the controller main control unit. The utility model provides a direct current charge controller has increased the way number of CAN bus for direct current charge controller CAN support to carry out the communication with more electric automobile's power management system, thereby saves the cost that dilatation direct current charge controller brought.

Description

DC charging controller

Technical Field

The utility model belongs to the technical field of electric automobile charges and specifically relates to a direct current charge controller.

Background

The can (controller Area network) bus, i.e. controller Area network bus, is a serial communication protocol standardized by ISO internationally and is one of the most widely used field buses internationally. At present, the CAN bus protocol becomes a standard bus of an automobile computer control system and an embedded industrial control local area network.

With the development of new energy vehicles and related technologies, a CAN bus is also gradually adopted as a communication bus between each module inside an electric vehicle. In the charging process of the electric vehicle, the direct current charging controller on the direct current charging pile needs to ensure that the CAN bus with enough paths CAN realize data communication with a Battery Management System (BMS). However, the number of Micro Control Units (MCU) providing the CAN bus in the dc charging Controller is limited, and if communication with more battery management systems of the electric vehicle needs to be supported, the number of MCUs needs to be correspondingly increased, so that the cost of the dc charging Controller is increased, and the production cost of the dc charging pile and even the production cost of the whole charging function module of the electric vehicle is increased.

Disclosure of Invention

For overcoming prior art's shortcoming, the utility model provides a direct current charge controller to solve the not enough problem of CAN bus way number on the current direct current charge controller.

A DC charging controller is characterized by comprising a controller main control unit, a charging control unit, a DC power supply module and at least one analog CAN bus unit; the charging control unit and the direct current power supply module are respectively connected with a CAN bus interface of the controller main control unit; the simulation CAN bus unit is connected with a serial peripheral interface of the controller main control unit and is used for simulating a CAN bus interface of the controller main control unit.

Optionally, the controller main control unit is an ARM processor.

Optionally, the ARM processor is an STM32F407 microprocessor.

Optionally, the analog CAN bus unit includes a CAN protocol engine, a logic control unit, and a data transceiver unit.

Optionally, the data transceiver unit includes a receiving buffer, a filter, and a receiving mask.

Optionally, the analog CAN bus unit is a MCP2515 microprocessor.

Optionally, the serial peripheral interface includes an enable terminal, a data output terminal, a data input terminal, a clock signal port, and an interrupt port, where the enable terminal is connected to a start pin of the MCP2515 microprocessor; the data output end is connected with a serial data receiving pin of the MCP2515 microprocessor; the data input end is connected with a serial data transmitting pin of the MCP2515 microprocessor; the clock signal port is connected with a system clock pin of the MCP2515 microprocessor; the interrupt port is connected with an interrupt pin of the MCP2515 microprocessor; a CAN bus data receiving pin of the MCP2515 microprocessor is used for receiving CAN data; and a CAN bus data transmitting pin of the MCP2515 microprocessor is used for transmitting CAN data.

Optionally, the number of the analog CAN bus units is two.

The utility model provides a DC charging controller, a charging control unit and a DC power supply module are respectively connected with two CAN bus interfaces of a controller main control unit, the DC power supply module realizes the conversion of AC and DC, and the charging process is charged through the charging control unit; the simulated CAN bus unit is externally connected to the serial peripheral device interface of the controller main control unit, the serial peripheral device interface of the controller main control unit is converted into a CAN bus interface, and the purpose of communicating with a battery management system of the electric vehicle is achieved by utilizing the converted CAN bus interface. Namely, on the premise of not increasing the number of the controller main control units, the serial peripheral device interfaces of the controller main control units are utilized to simulate the CAN bus interfaces, so that the problem that the number of CAN bus lines on the traditional direct current charging controller is insufficient is solved, the cost brought by the capacity-expanding direct current charging controller is saved, and the purpose of reducing the production cost of the direct current charging pile and even the whole vehicle charging function module of the electric vehicle is achieved.

Drawings

Fig. 1 is a schematic diagram of a dc charging controller according to an embodiment of the present invention;

FIG. 2 is an internal structure diagram of the CAN bus unit simulation in the embodiment of the present invention;

fig. 3 is a schematic circuit diagram of the embodiment of the present invention in which the serial peripheral device interface is converted into the CAN bus interface.

Detailed Description

In order to make the technical problem, technical solution and advantageous effects to be solved by the present invention more clearly understood, the following description is given in conjunction with the accompanying drawings and embodiments to illustrate the present invention in further detail. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

A dc charging controller, see fig. 1, wherein a controller main control unit includes two paths of CAN bus interfaces, i.e., CAN1 and CAN2, and two paths of Serial Peripheral interface (Serial Peripheral interface) interfaces, i.e., SPI1 and SPI 2; the charging control unit and the direct current power supply module are respectively connected with the CAN1 and the CAN2, the charging control unit is used for metering and charging the charging process, and the direct current power supply module is used for converting alternating current into direct current which CAN be used for charging the electric vehicle; the simulation CAN bus unit is used for converting the SPI interface to obtain a CAN bus interface, and then the CAN bus interface obtained by conversion is used for realizing communication with a battery management system of the electric vehicle. Namely, on the premise of not increasing the number of the controller main control units, the serial peripheral device interfaces of the controller main control units are utilized to simulate the CAN bus interfaces, so that the problem that the number of CAN bus lines on the traditional direct current charging controller is insufficient is solved, the cost brought by the capacity-expanding direct current charging controller is saved, and the purpose of reducing the production cost of the direct current charging pile and even the whole vehicle charging function module of the electric vehicle is achieved. The serial peripheral device interface is a standard serial peripheral device interface and is a high-speed, full-duplex and synchronous communication bus.

It CAN be understood that the CAN bus simulated by the simulated CAN bus unit CAN be used for connecting with the charging control unit or the dc power supply module, and the functions of the two are not different, that is, the simulated CAN bus interface has the same function as the original CAN bus interface of the controller main control unit.

In one embodiment, as shown in fig. 2, the analog CAN bus unit includes a CAN protocol engine, a data transceiving unit, and a logic control unit. The CAN protocol engine is a module supporting the CAN protocol and completely supports the CAN V2.0B technical specification; the CAN protocol engine comprises a receiving pin and a sending pin of CAN bus data and is used for receiving and sending data based on a CAN protocol; the logic control unit is a master control module simulating a CAN bus unit and is used for registering and transmitting interruption, synchronizing clocks and managing a CAN protocol engine and a data transmitting and receiving unit; the data receiving and sending unit is used for communicating with the SPI interface, namely, receiving data sent by the SPI and delivering the data to the CAN protocol engine for processing, or receiving data sent by the CAN protocol engine and forwarding the data to the SPI interface.

The data transceiver unit comprises a buffer, a filter and a shielding device, preferably, the number of the buffer and the shielding device is 2, and the number of the filter is 6. The buffer is used for realizing the buffer function of receiving and transmitting data, namely, the CAN protocol engine and the SPI interface CAN read or write data from the buffer in a buffer mode so as to reduce the data processing burden of the whole simulation CAN bus unit. The shielding device and the filter are used in cooperation with the buffer, and can filter and shield the unnecessary messages, so that the aim of optimizing data processing is fulfilled.

The SPI shown in fig. 2, corresponding to the analog CAN bus unit, is the serial peripheral interface of the controller main control unit. Wherein, TX and RX represent a data transmitting pin and a data receiving pin of the SPI interface, respectively, i.e., a data output terminal and a data input terminal corresponding to the serial peripheral interface; TX and RX are respectively connected with a data transceiving unit; INT is an interrupt pin of the SPI interface, namely an interrupt port corresponding to the serial peripheral interface, is connected with the logic control unit and is used for triggering interrupt, and CS is a chip selection pin of the SPI interface, namely an enable end corresponding to the serial peripheral interface, is connected with the logic control unit and is used for starting the analog CAN bus unit; the SCK is a synchronous clock pin of the SPI interface, namely a clock signal corresponding to the serial peripheral interface, is connected with the logic control unit and is used for synchronously simulating a working clock between the CAN bus unit and the SPI interface.

Preferably, the controller main control unit can adopt an ARM processor, in particular a 32-bit STM32F407 microprocessor; the analog CAN bus unit employs an MCP2515 microprocessor. The STM32F407 is an STM32F4 series single-chip microcomputer based on ARM Cortex-M4; the MCP2515 is an independent controller local area network protocol controller and fully supports the CAN V2.0B technical specification.

In one embodiment, the controller main control unit is an STM32F407 microprocessor, only supports two paths of CAN buses, and has 2 paths of standard SPI interfaces; the analog CAN bus unit is an MCP2515 microprocessor, and the MCP2515 microprocessor is connected with an SPI interface of the STM32F407 microprocessor, as shown in fig. 3.

The SPI1 is a standard SPI interface of an STM32F407 microprocessor, and is converted by an MCP2515 microprocessor to obtain a CAN bus interface, namely CAN 3.

The pin numbers on the MCP2515 microprocessing are TXCAN, RXCAN, CLKOUT/SOF, TX01RTS, TX1RTS, TX2RTS, OSC2, OSC1, Vss, RX1BF, RX0BF, INT, SCK, SI, SO, CS, RESET, VDD in sequence from 1 to 18. The TXCAN is a CAN bus data transmitting pin and is used for transmitting CAN bus data; the RXCAN is a CAN bus data receiving pin and is used for receiving CAN bus data; CLKOUT/SOF is a clock signal output pin for outputting a clock signal of a crystal oscillator; the TX01RTS, the TX1RTS and the TX2RTS are three data request sending feet respectively and are used for instructing to send data to the CAN bus; OSCs 2 and OSC1 are input pins of crystal oscillator signals, namely, a clock crystal oscillator generating circuit consisting of capacitors C355 and C357 and a resistor R364 in FIG. 3 is used for providing an external clock crystal oscillator for MCP2515 micro-processing; vss is a grounding pin; RX1BF and RX0BF are two receiving pins for buffering received data; INT is an interrupt pin which is used for sending an interrupt signal and is connected with an SPI1_ INT pin of an STM32F407 microprocessor; the SCK is a synchronous clock pin and is used for carrying out clock synchronization with externally connected equipment; SI and SO are the input and output foot of SPI interface separately, SI connects SPI _ MOSI foot of STM32F407 microprocessor, SO connects SPI1_ MISO of STM32F407 microprocessor; CS is a chip selection pin and is used for being connected with an SPI1_ EN pin of an STM32F407 microprocessor and enabling an SPI interface of the STM32F407 microprocessor; RESET is a RESET pin for resetting the MCP2515 microprocessing; VDD is the power pin used to provide power for the MCP2515 microprocessor.

It CAN be understood that another standard SPI interface SPI3 of the STM32F407 microprocessor may also be converted by the MCP2515 microprocessor to obtain another CAN bus interface, that is, CAN 4. Since the connection mode of SPI3 to CAN4 is the same as that of SPI1 to CAN3, it is not described here. The two CAN bus interfaces CAN3 and CAN4 obtained by the conversion of the MCP2515 microprocessor and the two CAN bus interfaces of the STM32F407 microprocessor CAN provide four CAN bus interfaces.

It is right above the utility model discloses direct current charge controller has explained for help understands the utility model discloses, nevertheless the utility model discloses an embodiment does not receive the restriction of above-mentioned embodiment, and any does not deviate from the utility model discloses change, modification, substitution, combination, simplification made under the principle all should be equivalent replacement mode, all contain within the protection scope the utility model discloses a.

Claims

1. A DC charging controller is characterized by comprising a controller main control unit, a charging control unit, a DC power supply module and at least one analog CAN bus unit; the charging control unit and the direct current power supply module are respectively connected with a CAN bus interface of the controller main control unit; the simulation CAN bus unit is used for simulating a CAN bus interface of the controller main control unit.

2. The dc charge controller of claim 1, wherein the controller master control unit is an ARM processor.

3. The dc charge controller of claim 2, wherein the ARM processor is an STM32F407 microprocessor.

4. The dc charge controller of claim 1, wherein the analog CAN bus unit comprises a CAN protocol engine, a logic control unit, and a data transceiving unit.

5. The DC charge controller of claim 4, wherein the data transceiver unit comprises a receive buffer, a filter, and a receive mask.

6. The dc charge controller of claim 4, wherein the analog CAN bus unit is an MCP2515 microprocessor.

7. The dc charge controller of claim 6, wherein the serial peripheral interface comprises an enable terminal connected to a start pin of the MCP2515 microprocessor, a data output terminal, a data input terminal, a clock signal port, and an interrupt port; the data output end is connected with a serial data receiving pin of the MCP2515 microprocessor; the data input end is connected with a serial data transmitting pin of the MCP2515 microprocessor; the clock signal port is connected with a system clock pin of the MCP2515 microprocessor; the interrupt port is connected with an interrupt pin of the MCP2515 microprocessor; a CAN bus data receiving pin of the MCP2515 microprocessor is used for receiving CAN data; and a CAN bus data transmitting pin of the MCP2515 microprocessor is used for transmitting CAN data.

8. The dc charge controller according to any of claims 1 to 7, wherein the number of analog CAN bus units is two.