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Quasi-resonance control circuit and method for zero-voltage switching and flyback converter

A quasi-resonant control and zero-voltage switching technology, which is applied in the direction of high-efficiency power electronic conversion, regulation of electrical variables, control/regulation systems, etc., can solve the problem of large switching power consumption, reduce switching losses, and achieve the effect of zero-voltage switching

Active Publication Date: 2014-09-24
SILERGY SEMICON TECH (HANGZHOU) CO LTD
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Problems solved by technology

[0004] In view of this, the object of the present invention is to provide a quasi-resonant control circuit and control method of zero-voltage switching and a flyback converter to solve the problem of large switching power consumption in the prior art

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[0026] The quasi-resonant control circuit and control method of the zero-voltage switch of the present invention will be described in more detail below in conjunction with the schematic diagram, which shows a preferred embodiment of the present invention. It should be understood that those skilled in the art can, on the basis of this description, in the claims The specific circuits of the present invention can be transformed and replaced within the scope of the present invention, while still achieving the advantageous effects of the present invention. The following descriptions are not intended to limit the invention.

[0027] In the following paragraphs the invention is described more specifically by way of example with reference to the accompanying drawings. It should be noted that all the drawings are in simplified form and use inaccurate scales, which are only used to facilitate and clearly assist the purpose of illustrating the embodiments of the present invention. In th...

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Abstract

The invention discloses a quasi-resonance control circuit and method for zero-voltage switching and a flyback converter. The quasi-resonance control circuit comprises a zero-voltage detection control circuit and a synchronous rectification control circuit. The zero-voltage detection control circuit samples a drain-source voltage of a synchronous rectification tube and outputs a corresponding resonance state detection control signal according to the volume or change rate of the drain-source voltage; the synchronous rectification control circuit receives the resonance state detection control signal; if a primary-side inductor and a junction capacitor of a main power switch tube can not resonate to a zero point, the on time of the synchronous rectification tube is prolonged in the next switching period, and a negative current is generated at the secondary side; the negative current at the secondary side is transmitted to the primary side, and discharge of the junction capacitor of the main power switch tube is accelerated. According to the quasi-resonance control circuit, the negative current at the secondary side is adopted to accelerate the discharge of the junction capacitor at the primary side so that the primary side can resonate to the zero point; consequently, zero-voltage switching is achieved, and switching loss is lowered.

Description

technical field [0001] The invention relates to the technical field of power electronics, in particular to a zero-voltage switch quasi-resonance control circuit, a control method, and a flyback converter. Background technique [0002] In the flyback converter, a resonance occurs between the primary inductance of the transformer and the junction capacitance of the main power switch tube, and the resonance waveform is as follows figure 1 As shown, in order to reduce the loss of the main power switch tube, the conduction of the main power switch tube is usually controlled in a quasi-resonant manner, that is, the primary side main power switch tube is turned on when the drain-source voltage drops to the lowest point. [0003] However, the lowest point of free resonance between the primary inductance of the transformer and the junction capacitance of the main power switch is V in -N×V o (V in is the input voltage of the converter, V o The output voltage of the converter, N is...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/338
CPCY02B70/10
Inventor 李俊杰赵晨
Owner SILERGY SEMICON TECH (HANGZHOU) CO LTD
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