Digital control system for DC/DC converter

Abstract

The invention discloses a digital control system for a DC / DC converter, which aims to realize the functions of current and voltage proportion integration differentiation (PID) algorithm control, pulse-width modulation (PWM) driving control, fault diagnosis, communication with the whole vehicle and the like in the DC / DC converter of an electric vehicle. The digital control system for the DC / DC converter comprises a power conversion circuit, wherein the power conversion circuit comprises an input end, a full-bridge phase shift circuit and an output end which are sequentially connected; the full-bridge phase shift circuit consists of four field effect tubes; and sampling circuits are arranged at the input end and the output end. The key is that: the digital control system further comprises a control unit, wherein the control unit comprises a control module, and an analogue-to-digital conversion module, a pulse-width modulation module and a controller area network (CAN) gateway module which are connected with the control module; the output end of the pulse-width modulation module is connected with the control ends of the field effect tubes; and the control module receives information from the input and output ends by the analogue-to-digital conversion module and the sampling circuits, and controls the output of the pulse-width modulation module according to the information.

Description

technical field [0001] The invention belongs to the technical field of electric vehicles, and in particular relates to a digital control system for a DC / DC converter used in electric vehicles. Background technique [0002] In the development of modern electric vehicles, the current low-voltage electrical load of the whole vehicle is between 1KW-2KW, the voltage of the high-voltage input terminal of the DC / DC converter is 300V, and the voltage of the low-voltage output terminal is 14V. In this case, the topology of the DC / DC converter basically adopts the full-bridge topology, and the driving MOSFETs adopt the full-bridge phase-shift PWM control technology. DC is realized by circuits and hardware chips, and it is not flashed into the software, so it is not easy to update the control, it cannot perform fault diagnosis, and it cannot communicate with the vehicle controller for diagnosis. Contents of the invention [0003] The purpose of the present invention is to propose a ...

AI Technical Summary

Problems solved by technology

In this case, the topology of the DC / DC converter basically adopts the full-bridge topology, and the driving MOSFETs adopt the full-bridge phase-shift PWM control technology. DC is implemented by circuits and hardware chips, and it is not written into the software, so it is not easy to update the control, it cannot perform fault diagnosis, and it cannot communicate with the vehicle controller.

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