Synchronous rectification controlling device and forward synchronous converter

A synchronous rectification and control device technology, applied in control/regulation systems, high-efficiency power electronic conversion, output power conversion devices, etc., can solve the problems of unstable output voltage VO, energy loss, etc., to avoid current reverse flow and improve output. Effects of voltage instability and energy loss

Inactive Publication Date: 2009-11-25
NIKO SEMICON
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the reverse current occurs, it will not only cause the instability of the output voltage VO, but also consume unnecessary energy

Method used

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  • Synchronous rectification controlling device and forward synchronous converter
  • Synchronous rectification controlling device and forward synchronous converter
  • Synchronous rectification controlling device and forward synchronous converter

Examples

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Embodiment Construction

[0079] refer to Figure 5 , is a schematic diagram of the architecture of the forward synchronous converter of the present invention. The forward converter 2 mainly includes a conversion unit Tr, a first switch Q1 , a PWM controller 20 , a synchronous rectification switch unit 24 and a synchronous rectification control device 23 .

[0080] Wherein, the conversion unit Tr has a primary side and a secondary side, the primary side is coupled to an input power Vin, and converts the power of the input power Vin into an output voltage VD, which is output on the secondary side of the conversion unit Tr. The first switch Q1 is coupled to the primary side of the conversion unit Tr. The PWM controller 20 controls the switching action of the first switch Q1 according to a feedback voltage signal VFB of the forward synchronous converter and a current detection signal VIC flowing through the first switch Q1 . The synchronous rectification switch unit 24 has a first rectification switch Q...

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Abstract

The invention discloses a synchronous rectification controlling device and a forward synchronous converter. The synchronous rectification controlling device is suitable for the forward synchronous converter. The forward synchronous converter comprises a converting unit, a first rectification switch and a second rectification switch, wherein the converting unit is provided with a primary side and a secondary side, and the first rectification switch and the second rectification switch are coupled with the secondary side of the converting unit. The synchronous rectification controlling device comprises a state judging circuit and a synchronous rectification controller. The state judging circuit is coupled with the secondary side of the converting unit, is used for judging whether the forward synchronous converter works in an critical state of an intermittent current mode and a continuous current mode or works in an intermittent current mode according to the rising slope of the voltage at the secondary side, and is used for outputting a reset signal. The synchronous rectification controller is coupled with the secondary side of the forward synchronous converter and the state judging circuit, and is used for switching off the second rectification switch for a preset time according to the reset signal so as to achieve the purpose of protecting backward current.

Description

technical field [0001] The present invention relates to a synchronous rectification device and a forward synchronous converter, especially to a synchronous rectification device and a synchronous rectification device for judging the boundary between a continuous current mode and a discontinuous current mode according to the rising slope of the output voltage of the secondary side of the converter. A forward synchronous converter using the aforementioned synchronous rectification device. Background technique [0002] figure 1 It is a schematic diagram of a forward converter in the prior art. The forward converter is equipped with a transformer T1, and its primary side is provided with the input power supply VIN provided by the previous circuit, the pulse width modulation controller PWM, the input filter capacitor C1, the initial resistor R1, the initial capacitor C2, and the current detection resistor R2 , the rectifier diode D1 and the transistor switch Q1 controlled by the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/217H02M3/335
CPCY02B70/1475Y02B70/10
Inventor 林春敏
Owner NIKO SEMICON
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