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Flyback power converter and electronic apparatus

A power converter, flyback technology, applied in output power conversion devices, high-efficiency power electronic conversion, conversion equipment that can be converted to DC without intermediate conversion, etc., which can solve the problem of low overall conversion efficiency and high withstand voltage. /Increase the cost of current-resistant components, increase the voltage stress of synchronous rectifier switches, etc.

Active Publication Date: 2014-05-21
LITE ON ELECTRONICS (GUANGZHOU) LTD +1
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  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

This not only increases the current stress of the synchronous rectification switch, but also increases the voltage stress of the synchronous rectification switch due to the voltage surge of the drain-source voltage of the synchronous rectification switch after the synchronous rectification switch is cut off. The disadvantages of lower overall conversion efficiency and higher cost of high withstand voltage / current resistant components

Method used

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  • Flyback power converter and electronic apparatus
  • Flyback power converter and electronic apparatus
  • Flyback power converter and electronic apparatus

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Embodiment Construction

[0126] Various exemplary embodiments will be described more fully hereinafter with reference to the accompanying drawings, in which some exemplary embodiments are shown. However, inventive concepts may be embodied in many different forms and should not be construed as limited to the illustrative embodiments set forth herein. Rather, this number of exemplary embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the inventive concept to those skilled in the art. In the drawings, the size and relative sizes of layers and regions may be exaggerated for clarity. Like numbers indicate like elements throughout.

[0127] It will be understood that, although the terms first, second, third etc. may be used herein to describe various elements, these various elements should not be limited by these various terms. These various terms are used to distinguish one element from another. Thus, a first element discussed below could b...

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Abstract

A flyback power converter and electronic apparatus suitable for synchronous rectification are disclosed. The flyback power converter includes a voltage transformer, a main switch, a synchronous rectification switch, a synchronous rectification control circuit, a sampling circuit and an operation circuit. A control end of the main switch receives a main switch signal so as to control the main switch. The synchronous rectification control circuit transmits control signal to control end of the synchronous rectification switch according to sensing signal received. The sampling circuit samples the state of the synchronous rectification switch so as to generate first logic signal and second logic signal. The operation circuit executes timing for charging / discharging according to the first and the second logic-signal, so as to output switch cut-off pulse signal to a voltage-dividing circuit. If voltage of the sensing signal is lower than predetermined threshold voltage, the synchronous rectification switch enters into cut-off state according to the control signal.

Description

technical field [0001] The present invention relates to a flyback power converter, and more particularly to a flyback power converter with synchronous rectification in continuous conduction mode or discontinuous conduction mode. Background technique [0002] In recent years, switching power supply is developing rapidly, and it plays an extremely important role in computers and electronic products. Compared with traditional power supply, switching power supply has the advantages of stability, simplicity and efficiency. . Among them, the flyback switching power converter is widely used because of its low cost and simplified circuit design. [0003] A common control method for synchronous rectification of a flyback switching power converter is to use a synchronous rectification control chip to detect the drain-source voltage of the synchronous rectification switch as a basis for controlling the synchronous rectification switch to be turned on or off. When the primary side swi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/217H02M5/10
CPCH02M3/33592Y02B70/10
Inventor 林忠义赖威列周聚忆罗有纲邱煌仁林景源
Owner LITE ON ELECTRONICS (GUANGZHOU) LTD
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