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Flyback converter and control method thereof

A technology of a flyback converter and a control method, which is applied in control/regulation systems, DC power input conversion to DC power output, instruments, etc., can solve the problems of inability to balance light-load efficiency and audio noise, and improve light-load efficiency Performance and Effect of Audio Noise Performance

Active Publication Date: 2019-11-29
DELTA ELECTRONICS INC
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0013] The purpose of this disclosure is to provide a flyback converter and its control method, which is used to overcome the defect that related flyback converters cannot take into account light-load efficiency and audio noise

Method used

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  • Flyback converter and control method thereof
  • Flyback converter and control method thereof
  • Flyback converter and control method thereof

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Embodiment Construction

[0059] Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments may, however, be embodied in many forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete and will fully convey the concept of example embodiments to those skilled in the art. The described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. In the following description, numerous specific details are provided in order to give a thorough understanding of embodiments of the present disclosure. However, those skilled in the art will appreciate that the technical solutions of the present disclosure may be practiced without one or more of the specific details being omitted, or other methods, components, devices, steps, etc. may be adopted. In other instances, well-known technical solution...

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Abstract

The invention provides a flyback converter and a control method thereof. The flyback converter comprises: a transformer which comprises a primary winding and a secondary winding; a switching tube coupled between the primary winding and a first node; a feedback circuit used for detecting the output voltage of a load and outputting a feedback voltage signal; a current sampling circuit coupled between the first node and a primary side grounding end and outputting a current sampling signal; and a control circuit coupled to the feedback circuit and the current sampling circuit, and used to receivethe feedback voltage signal and the current sampling signal respectively, output a switching tube control signal, and control the derivative of the switching frequency of the switching tube to the output power to be reduced along with the increase of the switching frequency when the switching frequency of the switching tube is greater than or equal to a threshold value. According to the flyback converter provided by the invention, the light load efficiency and the noise performance can be improved at the same time.

Description

technical field [0001] The present disclosure relates to the technical field of electronic power, and in particular, relates to a flyback converter and a control method thereof taking into account both light-load efficiency and audio noise. Background technique [0002] The flyback converter (Flyback Converter) is widely used in the field of low-power switching power supplies because of its simple circuit structure, electrical isolation of input and output stages, and low cost. [0003] In order to improve the light-load efficiency of the flyback converter to meet the needs of energy saving and environmental protection, the usual practice is to reduce the switching frequency f s . For QR (Quasi Resonant Flyback Mode, flyback quasi-resonant mode) and DCM (Discontinuous Current Mode, inductor current discontinuous mode) flyback converter, output power Po and switching frequency f s The relationship satisfies the following formula: [0004] [0005] where L m is the magn...

Claims

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Application Information

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IPC IPC(8): H02M3/335H02M1/44
CPCH02M1/44H02M3/33576H02M3/33507H02M3/33592H02M1/0003H02M1/0025H02M1/0035Y02B70/10H02M1/08H02M1/0009
Inventor 宋海斌许道飞章进法
Owner DELTA ELECTRONICS INC
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