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Synchronous rectification reverse-flow preventing circuit and method for parallel synchronous rectification converter

A technology of synchronous rectification and synchronous rectifier tube, which is applied in the direction of conversion equipment with intermediate conversion to AC, parallel operation of DC power supply, etc., can solve the problems of pre-start, start-up failure, converter damage, low efficiency of series diodes, etc. To achieve the effect of high parallel connection efficiency, simple and reliable circuit, and good effect

Active Publication Date: 2009-02-04
EMERSON NETWORK POWER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The purpose of the present invention is to solve the problems of pre-start, start-up failure, and even converter damage and low efficiency of series diodes in the existing synchronous rectification converter parallel technology, and provide a method to prevent synchronous rectification converters from running in parallel. Synchronous rectification anti-backflow circuit and method for backflow parallel synchronous rectification converter

Method used

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  • Synchronous rectification reverse-flow preventing circuit and method for parallel synchronous rectification converter
  • Synchronous rectification reverse-flow preventing circuit and method for parallel synchronous rectification converter
  • Synchronous rectification reverse-flow preventing circuit and method for parallel synchronous rectification converter

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Embodiment 1

[0044] Embodiment one: Figure 4a It is a full-wave synchronous rectification converter for secondary frontier anti-backflow and external drive of the present invention. The external drive synchronous rectification anti-backflow circuit includes secondary auxiliary power supply 1, voltage detection and comparison circuit 2, PWM drive signal, synchronous rectification external drive circuit, second transfer switch 3 (hereinafter referred to as S2 transfer switch), first transfer switch 4 ( hereinafter referred to as S1 transfer switch) composition. The output voltage terminal of the auxiliary power supply 1 is connected to the input terminal of the voltage detection and comparison circuit 2, the output terminal of the voltage detection and comparison circuit 2 is connected to the control terminals of the transfer switches 3 and 4, and the PWM driving signal in the PWM driving circuit is synchronously rectified The external drive circuit is coupled to the input end of the trans...

Embodiment 2

[0046] Embodiment two: if Figure 4b Shown is the circuit principle diagram of the full-wave synchronous rectification converter of the present invention. The external drive synchronous rectification anti-backflow circuit includes secondary auxiliary power supply, voltage detection and comparison circuit, S1 transfer switch, S2 transfer switch, PWM drive signal and synchronous rectification external drive circuit. The difference from Embodiment 1 is that: The auxiliary power supply on the secondary side is directly obtained from the output winding of the transformer, and the first switching tube Q1, the second switching tube Q2, the third switching tube Q3 and the fourth switching tube Q4 are respectively selected from transistors.

Embodiment 3

[0047] Embodiment three: Figure 4c It is a self-driven full-wave synchronous rectification converter for secondary backflow protection. The self-driven synchronous rectification anti-backflow circuit is composed of a secondary auxiliary power supply 1, a voltage detection and comparison circuit 2, an S1 transfer switch 4, an S2 transfer switch 3, an S1 self-driving drive, and an S2 self-driving drive. The difference from Embodiment 1 is that one path of S2 self-driving drive and S1 self-driving drive is respectively connected to the input terminals of the second and first transfer switches, and the other is respectively connected to the input terminals of the second and first transfer switches through a voltage dividing resistor. output.

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Abstract

The invention discloses a synchronous rectification anti-backflow circuit and method of parallel synchronous rectifier converter, including auxiliary power supply, voltage detection and comparison circuit, PWM drive circuit and transfer switch, where the voltage output end of the auxiliary power supply is connected to the input end of the voltage detection and comparison circuit, the output end of the voltage detection and comparison circuit is connected to the control end of the transfer switch, PWM drive signal in the PWM drive circuit is coupled to the input end of the transfer switch, and the output end of the transfer switch is coupled to the control end of the synchronous rectifier tubes. It makes the synchronous rectifier converter have no problems of prestarting, output voltage overshoot and depression, etc., as parallel working and the parallel efficiency of the converter is high. The invention has simple and reliable circuit, low cost, and good effect after tested.

Description

【Technical field】: [0001] The invention relates to a circuit and method for preventing current backflow when low-voltage and high-current synchronous rectification converters are connected in parallel. 【Background technique】: [0002] The further increase of load power requires DC-DC converters to operate in parallel to provide greater power supply, and the load current is shared equally among the converters to reduce the current stress of each converter. At the same time, parallel operation of the converters is easy to realize redundant backup and hot swap of the power supply system, so as to improve the reliability of the system power supply. At present, the parallel connection method of DC-DC converters is generally to add isolation diodes or MOS transistors at the output end of the converters to realize simple parallel connection and redundant backup of the converters. When the output voltage of the converter is high such as 5V and the output current is low such as 5A, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M3/28H02J1/10
Inventor 雷兴华倪倩
Owner EMERSON NETWORK POWER CO LTD
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