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Clamping circuit, switching power supply circuit and control method thereof

A switching power supply circuit and clamping switch technology, applied in the field of power supply, can solve the problem of low power conversion efficiency, and achieve the effect of reducing loss and improving efficiency

Active Publication Date: 2021-05-25
HUAYUAN SEMICON SHENZHEN LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The invention provides a clamping circuit, a switching power supply circuit and a control method thereof to solve the problem of low power conversion efficiency

Method used

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  • Clamping circuit, switching power supply circuit and control method thereof
  • Clamping circuit, switching power supply circuit and control method thereof
  • Clamping circuit, switching power supply circuit and control method thereof

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Embodiment Construction

[0078] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0079] The terms "first", "second", "third", "fourth", etc. (if any) in the description and claims of the present invention and the above drawings are used to distinguish similar objects and not necessarily Describe a specific order or sequence. It is to be understood that the data so used are interchangeable under appropriate circumstances such that the embodiments of the invention described herein can be practiced in sequences other than those illustrated or...

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Abstract

The invention provides a clamping circuit, a switching power supply circuit and a control method thereof, and the switching power supply circuit comprises a control module, a clamping module, a clamping switch tube and a first resistor. The first end of the clamping module is connected to the first end of a primary winding of the switching power supply circuit, the second end of the clamping module is connected with the first end of the clamping switch, and the second end of the clamping switch is connected with the first end of the first resistor. The second end of the first resistor is connected with the first end of a main switching tube of the switching power supply circuit, and the second end of the first resistor is also connected to the second end of the primary winding through a leakage inductor; two detection ends of the control module are respectively connected to two ends of the first resistor so as to monitor the voltage drop of the first resistor; and the control module is used for controlling the clamping switch tube to be turned on according to the voltage drop of the first resistor after the clamping switch tube is kept turned off and the main switch tube is controlled to be turned off.

Description

technical field [0001] The invention relates to the field of power supplies, in particular to a clamping circuit, a switching power supply circuit and a control method thereof. Background technique [0002] A switching power supply can be understood as a high-frequency power conversion device. Taking the flyback power supply as an example, it can also be understood as a flyback transformer switching power supply. The working principle can be, for example: when the primary coil of the transformer is just DC When the pulse voltage is excited, the secondary coil of the transformer does not provide power output to the load, but only after the excitation voltage of the transformer primary coil is turned off, it provides power output to the load. [0003] In the related art, the leakage inductance energy can be consumed by a clamping module (such as an RCD clamping module). However, the consumption of leakage inductance energy will inevitably lead to energy loss, thereby reducing ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M1/32H02M3/335
CPCH02M1/32H02M3/3353Y02B70/10
Inventor 郭春明董发文
Owner HUAYUAN SEMICON SHENZHEN LTD
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