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Snubber circuit and buffering method for snubber circuit

A snubber circuit and discharge current technology, which is applied in the snubber field of snubber circuits, can solve problems such as reducing power conversion efficiency and increasing energy loss, and achieves the effect of eliminating power loss and long reverse current recovery time

Active Publication Date: 2015-03-18
SPI ELECTRONICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this kind of bleeder resistance will increase the energy loss and reduce the conversion efficiency of the power supply

Method used

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  • Snubber circuit and buffering method for snubber circuit
  • Snubber circuit and buffering method for snubber circuit
  • Snubber circuit and buffering method for snubber circuit

Examples

Experimental program
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Embodiment Construction

[0074] In order to realize a snubber circuit that can be applied to high-speed switching and has low energy loss, the present invention first tests the existing snubber circuit to analyze the circuit characteristics of the existing snubber circuit, and discloses a snubber circuit according to the test results. buffer device. Further explanation follows.

[0075] see again figure 1 , which also shows a schematic diagram of an embodiment of the circuit structure used to test the existing buffer circuit of the present invention. Depend on figure 1 It can be seen that the RCD snubber circuit 102 is disposed on the primary side of the DC-to-DC converter 100 including the transformer TX1 , the switch Q1 , the diode D2 and the capacitor C2 . Those skilled in the art should be able to understand the details of the operation of the DC-DC converter 100 to convert an input voltage VB into an output voltage VOUT according to a control signal SP (for example, a pulse width modulation (P...

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PUM

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Abstract

A snubber circuit includes a capacitor and a buffer device. The buffer device has a first terminal and a second terminal. The first terminal is electrically connected to the capacitor. When the buffer device operates in a first conduction mode, a charge current flows from the second terminal to the first terminal through the buffer device. When the buffer device switches from the first conduction mode to a second conduction mode, the buffer device generates a discharge current which flows from the first terminal to the second terminal through the buffer device over a specific period of time, such that after the buffer device enters the second conduction mode, a relative maximum voltage level appearing first at the second terminal is lower than a voltage level at the first terminal.

Description

technical field [0001] The invention relates to a snubber circuit, in particular to a snubber circuit with long recovery time under high-speed switching and a related snubber method for the snubber circuit. Background technique [0002] figure 1 A conventional DC-to-DC converter (flyback converter) 100 for a switching power supply is shown, wherein the leakage inductance of the transformer TX1 will cause Voltage spike across switch Q1. The DC-DC converter 100 utilizes an RCD snubber circuit (RCD sunbber) 102 composed of a plurality of resistors RX and R1, a capacitor C1, and a diode D1 to reduce the instantaneous switching primary side circulating current Id, wherein the resistor R1 is an optional component. The RCD snubber circuit 102 charges the primary circulating current Id into the capacitor C1 through the diode D1. Since the recovery time / reverse current time (recovery time) of the diode D1 is too short, the capacitor C1 cannot be completely discharged through the d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M1/34
CPCH02M2001/342H02M2001/344H02M3/33507H02M3/335H02M1/34H02M1/348Y02B70/10H02M1/342H02M1/344
Inventor 林国藩
Owner SPI ELECTRONICS
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