Lossless absorption circuit of switching power supply output rectifier tube and switching power supply

A switching power supply, non-destructive absorption technology, applied in the direction of output power conversion device, irreversible AC power input conversion to DC power output, electrical components, etc., can solve the problems of loss, unfavorable power supply efficiency, etc., to achieve non-destructive absorption and avoid Effects of current spikes and peak voltage suppression

Active Publication Date: 2014-12-10
WUHAN YONGLI RAYCO TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] To sum up, although both RC and RCD snubber circuits can reduce the peak voltage on the rectifier diode, there is a certain loss, which is not conducive to ensuring the efficiency of the power supply.

Method used

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  • Lossless absorption circuit of switching power supply output rectifier tube and switching power supply
  • Lossless absorption circuit of switching power supply output rectifier tube and switching power supply
  • Lossless absorption circuit of switching power supply output rectifier tube and switching power supply

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Embodiment Construction

[0025] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not constitute a conflict with each other.

[0026] A non-destructive absorbing circuit of a switching power supply output rectifier in the present invention such as image 3 As shown, including the first capacitor C1, the first diode D5, the second diode D6 and the second inductor L2, the positive output terminal of the switching power supply rectifier circuit is connected to the first capacitor C1, the first diode D5 in sequence The cat...

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Abstract

The invention discloses a lossless absorption circuit of a switching power supply output rectifier tube. The lossless absorption circuit comprises a capacitor, a first diode, a second diode and an inductor. One end of the capacitor is connected with the positive output end of a switching power supply rectifier circuit, the other end of the capacitor is connected with the negative pole of the first diode, and the positive pole of the first diode is connected with the negative pole output end of the switching power supply rectifier circuit. The positive pole of the second diode is connected with the negative pole of the first diode, the negative pole of the second diode is connected with one end of the inductor, and the other end of the capacitor is connected with the connection point of output capacitance and output inductance. According to the lossless absorption circuit, the capacitor is used to absorb most energy of leakage inductance of a transformer and most energy of equivalent inductance of stray inductance in the circuit so that the voltage spike on the rectifier diodes is clamped. Meanwhile, impulse currents in the absorption circuit are effectively restrained by aid of the inductor so that large current spike is avoided. The lossless absorption circuit is simple in structure and effectively ensures efficiency and reliability of the power supply.

Description

technical field [0001] The invention belongs to the technical field of power electronics, and in particular relates to a non-destructive absorbing circuit for an output rectifier of a switching power supply and a switching power supply. Background technique [0002] In conventional forward, half-bridge, full-bridge and other circuits, the output rectifier diode works in a hard switching state. Due to the existence of the transformer leakage inductance and the series inductance of the rectifier diode, a peak voltage will be generated when the diode is turned off, especially the output voltage If it is relatively high, the spike voltage may cause the diode to break down due to overvoltage. The following takes the full-bridge rectifier circuit as an example to illustrate. When the secondary voltage of the transformer is zero, all four diodes of the full-bridge rectifier circuit are turned on, and the output filter inductor current is in a state of natural freewheeling; and when...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M1/32H02M7/06
Inventor 邓卫华熊辉
Owner WUHAN YONGLI RAYCO TECH
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