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Soft switching buck DC-DC converter

A DC-DC, step-down technology, applied in conversion equipment without intermediate conversion to AC, high-efficiency power electronic conversion, climate sustainability, etc., can solve the problem of high device cost, achieve low switching loss and high reliability. , the effect of a wide range of soft switching

Inactive Publication Date: 2011-07-27
FUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since the auxiliary network also introduces the switching loss of the auxiliary tube, if the auxiliary tube works in a hard switching state, the resulting switching loss will also affect the efficiency of the entire converter. If the auxiliary tube uses a high-voltage MOSFET, the cost of the device will be very high.

Method used

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  • Soft switching buck DC-DC converter
  • Soft switching buck DC-DC converter
  • Soft switching buck DC-DC converter

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Embodiment Construction

[0010] The present invention will be further described below in conjunction with the accompanying drawings and implementation examples.

[0011] Such as figure 1 As shown, the present invention provides a soft-switching step-down DC-DC converter, including a main switching tube Q, a freewheeling diode D 0 , inductance L 0 , filter capacitor C 0 and resistor R 0 A step-down DC converter composed of an auxiliary switch tube Q 1 , Resonant inductance L r , Resonant capacitance C r1 、C r2 , Diode D 1 、D 2 、D 3 composed of an auxiliary resonant network, characterized in that: the resonant capacitor C r2 One end, diode D 2 The negative pole of the main switching tube Q is connected to the positive pole of the power supply; the resonant capacitor C r2 The other end of the diode D 2 Anode, diode D 3 Negative pole, resonant inductance L r One end is connected; the resonant inductance L r The other end of the resonant capacitor C r1 One end is connected; the resonant ca...

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Abstract

The invention relates to a soft switching DC-DC converter. The converter comprises a buck DC converter consisting of a main switch tube Q, a freewheeling diode D0, an inductor L0 and a filter capacitor C0, and an auxilliary resonance network consisting of an auxilliary switch tube Q1, a resonant inductor Lr, resonant capacitors Cr1 and Cr2, and diodes D1, D2 and D3. The auxiliary resonance network is used for realzing zero-voltage zero-current turnoff of the main swithc tube, zero-current onoff of the auxiliary switch tube, and zero-current switching of the freewheeling diode. The converter has advantages of low switching consmuption, wide range of soft switching, high reliability and the like. The main switch tube and the auxiliary swithc tube can be taken as switchess by IGBT for high vltage and large power and the like occasions.

Description

technical field [0001] The invention relates to a DC-DC converter, in particular to a soft-switching step-down PWM converter. Background technique [0002] In recent years, the variety of switching devices has expanded, the parameter performance has been improved, and the circuit topology has been improved, so the soft switching circuit has developed rapidly. Power MOSFET is the first choice in low voltage and high frequency applications, while in high voltage, medium and high frequency converters, the superiority of IGBT has become increasingly prominent and has become the mainstream device. Since the IGBT is a compound device, the MOS in the equivalent circuit is quickly turned off during the turn-off process, causing V ce Rising rapidly, the charge stored in the equivalent transistor cannot be extracted from the MOS gate, part of it is eliminated by internal recombination, and the other part is in V ce Under the driving of the transistor, the collector current of the tr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M3/10
CPCY02B70/1491Y02B70/10
Inventor 林国庆
Owner FUZHOU UNIV