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Phase shift control soft switching PWM technology

Author: SunSongEr
Tutor: FanZuoGuo
School: Northwestern Polytechnical University
Course: Power Electronics and Power Drives
Keywords: Phase shift control PWM pulse width modulation Soft-switching converter
CLC: TM564
Type: Master's thesis
Year: 2001
Downloads: 496
Quote: 5
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Abstract


On the basis of analysis of the hard-switching power conversion circuit shortcomings soft switching converter circuit , the soft switch definition , classification , development and its control strategy and summarized . The analysis of the working principle of zero phase shift control voltage (ZVS) soft switching PWM (pulse width modulation ) power converter circuit characteristics , as well as some common circuit improvements , point out its advantages and disadvantages . On this basis , a new zero -voltage and zero- current (ZVZCS) full-bridge PWM power conversion circuit . It overcome the the zero voltage full-bridge PWM converter high circulation loss , severe duty cycle loss , the lagging leg soft switch is limited by the range of the load shortcomings . By blocking capacitors, saturable inductor and the main channel , plus two diode so that the circulation of the primary current is reduced to zero , zero current turn of the lagging leg switch tube , while the leading leg still in the primary side of the transformer plus zero voltage opened . Do a more in-depth exposition of its circuit topology , working principle and circuit characteristics . According to this new circuit topology using IGBT as the the lagging power switch tube high- voltage , high-power DC-DC converter experiments can be carried out . Thesis completed the main circuit configuration of the DC-DC converter , the parameters of the design and the realization of the control and protection circuits . The phase shift control using UC3879 to achieve, the experimental results show that the circuit topology is correct .

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CLC: > Industrial Technology > Electrotechnical > Electrical > Electrical switches,circuit breakers > Variety of switching
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