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Control circuit of phase-shifted full-bridge DC/DC converter

A full-bridge inverter circuit and phase-shifted full-bridge technology, which is applied in control/regulation systems, conversion of DC power input to DC power output, instruments, etc., can solve problems such as application restrictions

Active Publication Date: 2014-04-23
UNITED AUTOMOTIVE ELECTRONICS SYST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] To achieve the above goals, the traditional approach is to solve the EMC problem of DC / DC converters through filtering, shielding, good components and printed circuit board (PCB) layout, but these are all from the way of electromagnetic energy conduction to solve EMC problems, there are certain limitations in practical applications

Method used

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  • Control circuit of phase-shifted full-bridge DC/DC converter
  • Control circuit of phase-shifted full-bridge DC/DC converter
  • Control circuit of phase-shifted full-bridge DC/DC converter

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] The control circuit of the phase-shifted full-bridge DC / DC converter, such as figure 2 As shown, including a microprocessor (MCU);

[0034] The microprocessor is used to output the PWM signal to the control terminals of the switching tubes in the full-bridge inverter circuit of the phase-shifted full-bridge DC / DC converter;

[0035] The frequency of the PWM signal changes according to the regularity of the positive half cycle of a triangular wave or a sine wave within a jitter cycle.

[0036] Preferably, the control circuit of the phase-shifting full-bridge DC / DC converter also includes a PWM driving circuit; the PWM signal output by the microprocessor is amplified by the PWM driving circuit and then output to the phase-shifting circuit. The control terminal of each switching tube in the full-bridge inverter circuit of the full-bridge DC / DC converter is used to control each switching tube to achieve reliable on and off.

[0037] Preferably, the dithering period is be...

Embodiment 2

[0054] Based on the control circuit of the phase-shifted full-bridge DC / DC converter of Embodiment 1, such as figure 2 As shown, the microprocessor (MCU) includes a direct storage read module (DMA), a timer module (Timer), a CAN communication module, a PWM register, a PWM module, and an arithmetic module;

[0055] The CAN communication module is used for CAN (Controller Area Network, i.e. controller local area network) communication;

[0056] The PWM register is used to store the frequency and the duty cycle of the current PWM signal; the duty cycle can be calculated by the microprocessor according to the output voltage and the input current obtained by the detection circuit of the phase-shifted full-bridge DC / DC converter;

[0057] The direct storage and reading module (DMA) is used to control the frequency of the PWM signal calculated and output by the calculation module to be directly updated to the PWM register;

[0058] The PWM module, according to the frequency and dut...

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PUM

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Abstract

The invention discloses a control circuit of a phase-shifted full-bridge DC / DC converter. The control circuit comprises a microprocessor, the microprocessor is used for outputting a PWM signal to the control ends of switching tubes in a full-bridge inverter circuit of the phase-shifted full-bridge DC / DC converter, and the frequency of the PWM signal changes according to positive half cycles of triangular waves or sine waves in a jitter period. According to the control circuit of the phase-shifted full-bridge DC / DC converter, the electromagnetic compatibility of the DC / DC converter can be improved without increasing cost.

Description

technical field [0001] The invention relates to a DC / DC converter of an electric (pure electric, hybrid) vehicle, in particular to a control circuit of a phase-shifting full-bridge DC / DC converter. Background technique [0002] The DC / DC (direct current / direct current) converter is an important part of electric (pure electric, hybrid) vehicles, and its electromagnetic radiation (EMI) performance has a great impact on the electromagnetic compatibility (EMC) of the vehicle. In essence, the DC / DC converter realizes the voltage conversion by controlling the switching tube with a PWM (pulse width modulation) signal. During the switching process, accompanied by a high voltage-current conversion rate, the high voltage-current conversion rate leads to energy These are the main sources of electromagnetic radiation (EMI) generated by DC / DC converters. Based on this, in order to meet the requirements of the regulations on the EMC performance of the vehicle, it is necessary to control ...

Claims

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Application Information

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IPC IPC(8): H02M3/335H02M1/44
Inventor 段亮张东海郑海涛
Owner UNITED AUTOMOTIVE ELECTRONICS SYST
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