Alternation parallel voltage-releasing type convertor implemented by three-winding coupling inductance
A coupled inductor, step-down technology, applied in the field of interleaved parallel step-down converters, can solve the problems of large switching loss, large current ripple, and high cost, and achieve improved circuit efficiency, increased output gain, and fewer additional components Effect
Inactive Publication Date: 2010-08-18
ZHEJIANG UNIV
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Problems solved by technology
This flyback type interleaved parallel DC-DC converter works with hard switching, and the switching loss is large, so it is not suitable for large step-down ratio conversion. The leakage inductance energy causes the voltage peak of the first power switch tube and the second power switch tube, and the efficiency is low. Low
Among other isolated step-down converters, the input current and output current ripple of the forward converter are large, and an additional circuit is required to realize the soft switching of the switching tube, and the full-bridge step-down converter requires more Switching tube, the cost is high, the current ripple of the traditional half-bridge step-down converter is relatively large, and it is only suitable for low-power occasions
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[0010] Referring to Fig. 1, the interleaved parallel step-down converter realized by the three-winding coupled inductor of the present invention includes two power switch tubes S1, S2, two freewheeling diodes Do1, Do2, two clamping capacitors Cc1, Cc2, and an output Capacitor Co and two coupled inductors, the first coupled inductor has three windings L1a, L1b, L1c, and the second coupled inductor has three windings L2a, L2b, L2c, which is characterized in that the drain of the first power switch tube S1 is coupled to the second One end of the third winding L2c of the inductor is connected to one end of the first clamping capacitor Cc1, and the drain of the second power switch S2 is connected to one end of the third winding L1c of the first coupling inductor and one end of the second clamping capacitor Cc2 The other end of the third winding L1c of the first coupled inductor is connected to the other end of the third winding L2c of the second coupled inductor and the positive end...
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A stagger parallel depressurizing transformer realized by three winding coupling inductances of the invention comprises two power switching tubes, two flywheel diodes, two clamping capacitances, an output capacitance and two coupling inductancess, and two coupling inductances respectively have three windings. The third winding of the two coupling inductances realizes the large step down ratio transformation, and the circuit composed of a first switch pipe and a first clamping capacitance adsorbs and transfers the leakage inductance energy of the first coupling inductances without loss, while the circuit composed of a second switch pipe and a second clamping capacitance adsorbs and transfers the leakage inductance energy of the second coupling inductances without loss, wherein the couplinginductance has the isolating function of the transformer and the filter inductance. The first winding and the third winding of the first coupling inductance, the leakage inductance of the first and the third windings of the second coupling inductance and first clamping capacitance, and the low pass filter composed of a second clamping capacitance reduce the input current ripple, with little circuit elements and simple structure, which realizes the large step down ratio transformation of the transformer and advanced efficiency of the transformer.
Description
technical field [0001] The invention relates to a DC-DC converter, in particular to an interleaved parallel step-down converter realized by three-winding coupled inductors. Background technique [0002] A conventional flyback (Flyback) interleaved parallel DC-DC converter includes two coupled inductors with two windings, two freewheeling diodes, two power switch tubes and an output capacitor, the first power switch tube The drain is connected to one end of the first winding of the first coupled inductor, the drain of the second power switch tube is connected to one end of the first winding of the second coupled inductor, and the other end of the first winding of the first coupled inductor is connected to the second The other end of the first winding of the coupled inductor is connected, one end of the second winding of the first coupled inductor is connected to the anode of the first diode, and one end of the second winding of the second coupled inductor is connected to the ...
Claims
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IPC IPC(8): H02M3/04
Inventor 何湘宁李武华
Owner ZHEJIANG UNIV