CPLD (Complex Programmable Logic Device)-based phase-shifted full bridge over-current self-protection circuit and control method thereof
A phase-shifting full-bridge and self-protection technology, which is applied in the direction of emergency protection circuit devices, electrical components, output power conversion devices, etc., can solve problems such as failure to meet work requirements, affect device life, and voltage bias, and achieve favorable Multi-machine parallel control, simple and easy circuit implementation, and the effect of eliminating transformer bias
Active Publication Date: 2013-11-20
SOUTH CHINA UNIV OF TECH
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Problems solved by technology
The four-way PWM that drives IGBTs at the same time is generally generated by the DSP controller. Since the four-way PWM signals output by the DSP controller are complementary in pairs, it is impossible to turn off all the IGBTs at the same time when an over-current fault occurs, which cannot meet the actual work requirements. Require
Furthermore, the commonly used over-current cycle protection will cause voltage bias phenomenon when the circuit works under continuous over-current fault, which will affect the life of the device.
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[0021] The implementation of the present invention will be described in further detail below in conjunction with the accompanying drawings.
[0022] like figure 1 Shown, a kind of phase-shifting full-bridge overcurrent self-protection circuit based on CPLD comprises in the figure: DSP controller, CPLD programmable controller, current sampling and comparison circuit 1 thereof; Described DSP controller produces 4 road belts There are dead time and two complementary PWM signals: the first input PWM signal PWM1, the second input PWM signal PWM2, the third input PWM signal PWM3, the fourth input PWM signal PWM4; 5 of the CPLD programmable logic device Each I / O port is connected to the 4-way PWM signal output by the DSP controller, the current sampling and the output of the comparison circuit, and through its 4 I / O ports, the 4-way output has over-current protection and has a dead time and Two complementary PWM signals: the first output PWM signal PWMA, the second output PWM signal...
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The invention discloses a CPLD (Complex Programmable Logic Device)-based phase-shifted full bridge over-current self-protection circuit. The circuit comprises a DSP (Digital Signal Processor) controller, a CPLD programmable controller, a current sampler and a comparison circuit thereof, wherein the DSP controller generates four paths of mutually complementary PWM (Pulse Width Modulation) signals with dead zone time; five I / O (Input / Output) ports of the CPLD programmable logic device are connected with four paths of PWM signals output by the DSP controller and outputs of the current sampler and the comparison circuit thereof respectively; and four paths of mutually complementary PWM signals with over-current protection and dead zone time are output through the four I / O ports. The periodic self-protection circuit is simple and practical to realize over-current fault protection with least PWM signals, save the design cost and meanwhile eliminate the transformer bias phenomenon produced by continuous fault protection.
Description
technical field [0001] The invention relates to the technical field of a phase-shifting full-bridge switching power supply, in particular to a CPLD-based phase-shifting full-bridge overcurrent self-protection circuit and a control method thereof. Background technique [0002] As a relatively mature soft switching circuit, the phase-shifted full-bridge circuit is often used in medium and high-power power supply circuits. IGBTs are often used as switching tubes in full-bridge circuits. When an over-current fault occurs, the instantaneous over-current time that the IGBT can withstand is generally no more than 10us. If the over-current fault is only handled by the DSP controller, the IGBT will be burned. The four-way PWM that drives IGBTs at the same time is generally generated by the DSP controller. Since the four-way PWM signals output by the DSP controller are complementary in pairs, it is impossible to turn off all the IGBTs at the same time when an over-current fault occurs...
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IPC IPC(8): H02H7/10H02M1/08
Inventor杜贵平朱天生
OwnerSOUTH CHINA UNIV OF TECH