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Zero-voltage turn-on control circuit and method and switching power supply applying same

A zero-voltage turn-on and control circuit technology, applied in control/regulation systems, high-efficiency power electronic conversion, electrical components, etc.

Active Publication Date: 2020-03-20
SILERGY SEMICON TECH (HANGZHOU) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In view of this, the present invention provides a zero-voltage turn-on control circuit and method that can be adapted to various applications, so as to solve the problem that zero-voltage turn-on cannot be realized in various modes in the prior art

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  • Zero-voltage turn-on control circuit and method and switching power supply applying same
  • Zero-voltage turn-on control circuit and method and switching power supply applying same
  • Zero-voltage turn-on control circuit and method and switching power supply applying same

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Embodiment Construction

[0038] The present invention is described below based on examples, but the present invention is not limited to these examples. In the following detailed description of the invention, some specific details are set forth in detail. The present invention can be fully understood by those skilled in the art without the description of these detailed parts. In order not to obscure the essence of the present invention, well-known methods, procedures, procedures, components and circuits have not been described in detail.

[0039] Additionally, those of ordinary skill in the art will appreciate that the drawings provided herein are for illustrative purposes and are not necessarily drawn to scale.

[0040] Meanwhile, it should be understood that in the following description, "circuit" refers to a conductive loop formed by at least one element or sub-circuit through electrical connection or electromagnetic connection. When an element or circuit is said to be "connected to" another eleme...

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Abstract

The invention discloses a zero-voltage turn-on control circuit, a zero-voltage turn-on control method and a switching power supply applying the zero-voltage turn-on control circuit, and the zero-voltage turn-on of a main power switch is realized by turning on a synchronous rectification switch for a period of time before the next period of conduction of the main power switch is advanced by a period of time or a certain number of resonance periods.

Description

technical field [0001] The invention relates to a power electronic technology, more specifically, to a zero-voltage turn-on control circuit, a method and a switching power supply using the same. Background technique [0002] In the prior art, the flyback power converter is very suitable for low-power switching power supplies due to its simple design and wide input and output range. However, due to the unavoidable turn-on loss in the CCM, QR or DCM state, it greatly limits the switching The increase in frequency, the reduction in size and the increase in efficiency. In order to solve the above problems, a common practice is to use another switch tube to reverse a certain output voltage to excite the excitation inductor, so as to realize the zero-voltage turn-on of the primary side MOS tube, thereby improving the performance of the system. [0003] One implementation method is to share the switching tubes of synchronous rectification, but this method can only work in the QR m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M1/08H02M3/335
CPCH02M1/083H02M3/33592Y02B70/10H02M1/0058H02M1/0048H02M1/08H02M3/33576H02M3/33523H02M3/33515
Inventor 邓建黄秋凯
Owner SILERGY SEMICON TECH (HANGZHOU) CO LTD