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Flyback circuit and control method thereof

A technology of flyback circuit and control method, applied in the direction of control/adjustment system, emergency protection circuit device, electrical components, etc., can solve the problem of inflexible setting of output current overcurrent protection point, and achieve convenient system parameter design, accurate The effect of output overcurrent protection

Active Publication Date: 2021-11-30
JOULWATT TECH INC LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a flyback circuit and its control method that can flexibly realize output current overcurrent protection, which solves the problem of inflexible setting of output current overcurrent protection point in the prior art

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  • Flyback circuit and control method thereof
  • Flyback circuit and control method thereof
  • Flyback circuit and control method thereof

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Embodiment Construction

[0035] Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings, but the present invention is not limited to these embodiments. The present invention covers any alternatives, modifications, equivalent methods and schemes made within the spirit and scope of the present invention.

[0036] In order to provide the public with a thorough understanding of the present invention, specific details are set forth in the following preferred embodiments of the present invention, but those skilled in the art can fully understand the present invention without the description of these details.

[0037] In the following paragraphs the invention is described more specifically by way of example with reference to the accompanying drawings. It should be noted that all the drawings are in a relatively simplified form and use inaccurate scales to facilitate and clearly assist the purpose of illustrating the embodiments of the prese...

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Abstract

The invention provides a flyback circuit and a control method thereof. A first end of a sampling resistor is connected with a main power tube, a second end of the sampling resistor is connected with a system ground end, a reference ground end of a control circuit of the flyback circuit is connected with a common connection end of the sampling resistor and the main power tube, and a second end voltage of the sampling resistor is a first negative voltage; a bias voltage is superposed on the basis of the first negative voltage to obtain a first voltage; an output current estimation signal is obtained according to the first voltage; and when the output current estimation signal is greater than the first reference voltage, output current overcurrent protection is started. According to the invention, overcurrent protection points can be flexibly set, system parameter design is facilitated, and overcurrent protection can be accurately realized.

Description

technical field [0001] The invention relates to the field of power electronics, in particular to a flyback circuit and a control method thereof. Background technique [0002] In the prior art, the output overcurrent protection method of the adapter and the charger is usually realized through OPP (Over Power Protection) in the controller of the flyback circuit. However, the accuracy of output over-current protection is usually poor, especially under different input voltages, the output over-current protection point changes greatly, and the output over-current protection point is relatively high under high input voltage, usually need to add input voltage Compensation, but there is no way to achieve good accuracy. [0003] In the existing technical solution, taking the flyback converter as an example, the controller adopts such as figure 1 The peripheral circuit samples the peak voltage representing the peak current of the inductor through the CS pin, and divides the voltage ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H7/12H02M3/335
CPCH02H7/1213H02H1/0007H02M3/33523
Inventor 许祥勇
Owner JOULWATT TECH INC LTD