Digital control system for DC/DC converter

A control system and converter technology, applied in control/regulation systems, output power conversion devices, instruments, etc., can solve problems such as inability to diagnose faults and difficult updates, and achieve high reliability and simple hardware circuits.

Inactive Publication Date: 2011-08-31
CHERY AUTOMOBILE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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 c

Method used

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  • Digital control system for DC/DC converter
  • Digital control system for DC/DC converter
  • Digital control system for DC/DC converter

Examples

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Example Embodiment

[0016] Example 1:

[0017] Such as figure 1 As shown, the DC / DC converter digital control system of this embodiment includes a power conversion circuit and a control unit composed of TI’s TMS320F28035 chip. The power conversion circuit includes sequentially connected input terminals and consists of four field effect transistors. The full-bridge phase shift circuit composed of Q1, Q2, Q3, and Q4, the output terminal, the input terminal is connected to the 336 volt high-voltage battery 1 and filter 2, the output terminal is connected to the full bridge phase shift circuit through the coil and 3; the input terminal Sampling circuits are provided on both the output terminals and the output terminals. The sampling circuits provided at the input terminals are current sampling circuits and voltage sampling circuits. The current sampling circuits are current transformers 4 connected in series in the positive input terminal, and the input current sampling is Ip , Ip-R, the input voltage i...

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PUM

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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 ...

Claims

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Application Information

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IPC IPC(8): H02M3/335
Inventor 张兴林
Owner CHERY AUTOMOBILE CO LTD
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