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Driving circuit and driving method applied to flyback-type converter and quasi-resonant soft-switching flyback-type converter applying same

A flyback converter and drive circuit technology, applied in the direction of adjusting electrical variables, high-efficiency power electronic conversion, output power conversion devices, etc., can solve the problems of complex circuit design and high implementation costs, achieve compact chip structure, reduce power cost, the effect of accurate detection

Active Publication Date: 2013-03-27
SILERGY SEMICON TECH (HANGZHOU) CO LTD
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

It can be seen that with this implementation method, although the quasi-resonant soft switching control of the main power switch can be realized, the circuit design is relatively complicated and the implementation cost is also high

Method used

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  • Driving circuit and driving method applied to flyback-type converter and quasi-resonant soft-switching flyback-type converter applying same
  • Driving circuit and driving method applied to flyback-type converter and quasi-resonant soft-switching flyback-type converter applying same
  • Driving circuit and driving method applied to flyback-type converter and quasi-resonant soft-switching flyback-type converter applying same

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Embodiment Construction

[0071] Several preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings, but the present invention is not limited to these embodiments. The present invention covers any alternatives, modifications, equivalent methods and solutions made on the essence and scope of the present invention. In order for the public to have a thorough understanding of the present invention, specific details are described in the following preferred embodiments of the present invention, and those skilled in the art can fully understand the present invention without the description of these details.

[0072] reference image 3 , Shown is the principle block diagram of the first embodiment of the driving circuit for the flyback converter according to the present invention, which consists of a sub-control signal generating circuit 301, a top power switch tube 302, a bottom power switch tube 303, and a main power switch Tube 304, differential...

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Abstract

The present invention relates to a quasi-resonant controlling and driving circuit and method for a flyback converter. In one embodiment, a controlling and driving circuit for a flyback converter, can include: a differentiation circuit configured to receive a third controlling signal and a drain-source voltage of a main power switch of the flyback converter; where the drain-source voltage is configured to be differentiated by the differentiation circuit to generate a differential voltage when the third controlling signal is active within an interval that the main power switch is shut-off; a valley voltage detection circuit coupled to the differentiation circuit, and configured to receive the differential voltage; and where a valley controlling signal is configured to be generated by the valley voltage detection circuit to achieve quasi-resonant driving for the main power switch of the flyback converter when the differential voltage crosses zero with a positive slope.

Description

Technical field [0001] The invention relates to a driving circuit, in particular to a driving circuit and a driving method in a flyback converter, and a quasi-resonant soft-switching flyback converter using the same. Background technique [0002] The high frequency of the switch is an important direction for the development of modern switching power supplies. The reason is that the high frequency of the switch can greatly reduce the volume and weight of the switching converter, thereby increasing the power density of the converter, and increasing the switching frequency can also reduce The audio noise of the switching power supply improves the dynamic response. To achieve high frequency, switching losses must be reduced, and soft switching technology is one of the important methods to reduce switching losses. Through the principle of resonance, the voltage or current of the switching tube in the switching converter is changed according to the sine or quasi-sine law. When the vol...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M1/08H02M3/337
CPCH02M2001/0058Y02B70/1433H02M3/33507Y02B70/1491H02M1/0058Y02B70/10
Inventor 陈圣伦金津
Owner SILERGY SEMICON TECH (HANGZHOU) CO LTD
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