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Zero voltage switch active clamp positive and negative violent changer

A zero-voltage switching and converter technology, which is used in conversion equipment with intermediate conversion to AC, regulating electrical variables, and high-efficiency power electronic conversion. It can solve problems such as large turn-on losses, reduce turn-on losses, and reduce EMI emissions. Effect

Active Publication Date: 2007-10-03
BEIJING SUPLET +1
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  • Summary
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AI Technical Summary

Problems solved by technology

When this kind of forward and flyback converter is working, the clamp tube has a natural zero-voltage turn-on condition, but the turn-on of the switch tube is hard turn-on, which will cause relatively large turn-on loss

Method used

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  • Zero voltage switch active clamp positive and negative violent changer
  • Zero voltage switch active clamp positive and negative violent changer
  • Zero voltage switch active clamp positive and negative violent changer

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Embodiment Construction

[0019] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0020] Fig. 1 to Fig. 4 show four circuit schematic diagrams of the single-transformer forward-flyback converter in the prior art.

[0021] As shown in Figure 5, a zero-voltage switching active clamp forward and flyback converter includes a transformer, a switch tube, a clamp tube, a clamp capacitor, a rectifier tube, a resonant inductor, an energy storage inductor, and an output capacitor. The primary side circuit of the converter is an active clamping circuit, the switching tube S1 is connected in series with the primary side winding Np of the transformer and then connected to both ends of the input voltage; the clamping tube S2 is connected in parallel with the primary side winding Np of the transformer after being connected in series with the clamping capacitor C1; The secondary circuit of the converter is composed of the secondary winding Ns of the...

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Abstract

An active clamping positive-negative excitation converter of zero voltage switch is prepared as using active clamping circuit as converter primary edge circuit, parallel-connecting switch tube to converter primary edge winding then to two ends of input voltage, parallel-connecting clamp tube to clamp capacity then to said winding, using full-bridge rectification circuit as converter secondary edge circuit, series-connecting resonant inductance in secondary edge circuit to let current of secondary edge winding flow through inductance for making current variation of secondary edge winding be current variation of inductance excitation.

Description

technical field [0001] The invention relates to a power supply circuit, in particular to a switching power supply and a power supply circuit for power conversion. Background technique [0002] The forward and flyback converter combines the advantages of the forward converter and the flyback converter, and has better overall performance. There is a type of forward-flyback converter that uses one transformer to realize the functions of forward transformer and flyback transformer, so that the transformer can be fully utilized, such as the active clamp forward-flyback (FFAC) converter shown in Figure 1 to Figure 4 . When the forward and flyback converter is working, the clamp tube has a natural zero-voltage turn-on condition, but the turn-on of the switch tube is hard turn-on, which will cause a relatively large turn-on loss. Contents of the invention [0003] The present invention proposes a novel zero-voltage switching (ZVS) active-clamp forward-flyback converter circuit j...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/28H02M3/335H02M3/338
CPCY02B70/1491Y02B70/10
Inventor 陈永胜丁贤后
Owner BEIJING SUPLET
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