Clamping circuit, switching power supply circuit and control method thereof

A technology of switching power supply circuit and clamping switch, which is 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: 2022-06-03
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 technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0079] The terms "first", "second", "third", "fourth", etc. (if present) in the description and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects and are not necessarily used to Describe a particular order or sequence. It is to be understood that the data so used may be interchanged under appropriate circumstances such that the embodiments of the invention described herein can be ...

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Abstract

The invention provides a clamping circuit, a switching power supply circuit and a control method thereof. The switching power supply circuit includes: a control module, a clamping module, a clamping switch tube and a first resistor; the first end of the clamping module is connected to To the first end of the primary winding of the switching power supply circuit, the second end of the clamping module is connected to the first end of the clamping switch, and the second end of the clamping switch is connected to the first end of the first resistor end, the second end of the first resistor is connected to the first end of the 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 leakage inductance; The two detection terminals of the control module are respectively connected to the two ends of the first resistor to monitor the voltage drop of the first resistor; the control module is used for: keeping the clamping switch off, And after the main switch tube is controlled to be turned off, the clamp switch tube is controlled to be turned on according to the voltage drop of the first resistor.

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] The switching power supply can be understood as a high-frequency electric energy conversion device. Taking the flyback power supply as an example, it can also be understood as a flyback transformer switching power supply. When the pulse voltage is excited, the secondary coil of the transformer does not provide power output to the load, but only provides power output to the load after the excitation voltage of the primary coil of the transformer is turned off. [0003] In the related art, the leakage inductance energy can be consumed by a clamping module (eg, an RCD clamping module), however, due to the consumption of leakage inductance energy, energy loss will inevitably be caused, thereby reducing the power conversion efficiency. SUMMARY OF THE INVENTION [0004] The ...

Claims

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Application Information

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Patent Type & Authority Patents(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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