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A non-destructive absorbing circuit for output rectifier tube of switching power supply and switching power supply

A switching power supply and rectifier circuit technology, applied in output power conversion devices, irreversible AC power input conversion to DC power output, electrical components and other directions, can solve problems such as loss and adverse power efficiency, achieve lossless absorption, avoid Effects of current spikes, avoiding voltage spikes

Active Publication Date: 2017-06-13
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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  • A non-destructive absorbing circuit for output rectifier tube of switching power supply and switching power supply
  • A non-destructive absorbing circuit for output rectifier tube of switching power supply and switching power supply
  • A non-destructive absorbing circuit for output rectifier tube of switching power supply 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 non-destructive absorption circuit of a switching power supply output rectifier tube, which comprises a capacitor, a first diode, a second diode and an inductor; one end of the capacitor is connected to the positive output end of the switching power rectifier circuit, and the other end is connected to the first The cathode of a diode, the anode of the first diode is connected to the negative output terminal of the switching power supply rectifier circuit; the anode of the second diode is connected to the cathode of the first diode, and the cathode of the second diode is connected to the inductor One end; the other end of the inductor is connected to the junction of the output capacitor and the output inductor. The present invention utilizes the capacitance to absorb most of the energy on the equivalent inductance of the leakage inductance of the transformer and the stray inductance in the circuit, so that the voltage peak on the rectifier diode is clamped, and at the same time, the inrush current in the absorbing circuit is effectively suppressed by the inductance to prevent occurrence of Larger current spikes, the entire circuit structure is simple, effectively ensuring the 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 Patents(China)
IPC IPC(8): H02M1/32H02M7/06
Inventor 邓卫华熊辉
Owner WUHAN YONGLI RAYCO TECH
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