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Driving method, driving circuit and switching power supply thereof

A driving method and switching power supply technology, applied in the direction of high-efficiency power electronic conversion, electrical components, and adjusting electrical variables, etc., can solve the problems of large loss and low system efficiency, and achieve the effect of reducing loss and improving system efficiency

Active Publication Date: 2020-09-25
CHENGDU MONOLITHIC POWER SYST
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the existing driving method has a large loss and the system efficiency is not high

Method used

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  • Driving method, driving circuit and switching power supply thereof
  • Driving method, driving circuit and switching power supply thereof
  • Driving method, driving circuit and switching power supply thereof

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Embodiment Construction

[0015] Specific embodiments of the present invention will be described in detail below, and it should be noted that the embodiments described here are only for illustration, not for limiting the present invention. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. It will be apparent, however, to one of ordinary skill in the art that these specific details need not be employed to practice the present invention. In other instances, well-known circuits, materials or methods have not been described in detail in order to avoid obscuring the present invention.

[0016] Throughout this specification, reference to "one embodiment," "an embodiment," "an example," or "example" means that a particular feature, structure, or characteristic described in connection with the embodiment or example is included in the present invention. In at least one embodiment. Thus, appearances of the phrases "in on...

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Abstract

The invention discloses a driving method and a driving circuit for driving a switching power supply and the corresponding switching power supply. The switching power supply comprises a transformer, aprimary side switch and an auxiliary switch. The transformer is provided with a primary winding and an auxiliary winding; auxiliary current flows through the auxiliary winding, the auxiliary switch iscoupled with the auxiliary winding in series, the primary side switch is coupled with the primary side winding in series, primary side switch voltage exists between the first end and the second end of the primary side switch, the primary side switch voltage has a trough value, and auxiliary switch voltage exists between the first end and the second end of the auxiliary switch. The driving methodcomprises the following steps of when the auxiliary current reaches a reference auxiliary current, turning off the auxiliary switch, when the trough value of the primary side switch voltage appears, conducting the primary side switch, and if the trough value of the primary side switch voltage is smaller than the first trough voltage threshold value, reducing the reference auxiliary current. The driving method provided by the invention can reduce the loss of the switching power supply and improve the system efficiency.

Description

technical field [0001] The present invention relates to electronic circuits, and in particular, the present invention relates to the control of flyback switching converters. Background technique [0002] The flyback switching converter includes a primary switch and an auxiliary switch. In the existing driving mode, when the auxiliary switch is turned on, the auxiliary current flowing through the auxiliary switch first decreases in the positive direction, then crosses zero, and then reverses. increase. When the auxiliary current increases to the preset reference auxiliary current in the opposite direction, the auxiliary switch is turned off, and the voltage of the primary switch between the two ends of the primary switch decreases rapidly. The switching power supply turns on the primary switch when the primary switch voltage drops to a valley value. However, the existing driving method has a large loss and the system efficiency is not high. Therefore, it is necessary to pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M1/08H02M3/335
CPCH02M1/08H02M3/33569H02M1/0054Y02B70/10H02M1/0025H02M1/0064H02M3/33523H02M1/0006H02M3/33592
Inventor 陈跃东
Owner CHENGDU MONOLITHIC POWER SYST