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Flyback converter overcurrent protection achieving method for nonlinear circuit

A flyback converter and non-linear circuit technology, applied in the direction of emergency protection circuit devices, electrical components, etc., can solve the problems of large changes, difficult to achieve safety protection of circuit devices, etc., and achieve the effect of good overcurrent protection function

Inactive Publication Date: 2014-10-15
AQUIL STAR PRECISION IND SHENZHEN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the defect of this design is that when the input voltage range is wide and the output power exceeds the rated load power, the maximum average current output varies greatly with the input voltage, and it is difficult to protect the safety of circuit devices.

Method used

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  • Flyback converter overcurrent protection achieving method for nonlinear circuit
  • Flyback converter overcurrent protection achieving method for nonlinear circuit
  • Flyback converter overcurrent protection achieving method for nonlinear circuit

Examples

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Embodiment Construction

[0043] like Figures 3 to 6 As shown, a non-linear circuit implements a method for overcurrent protection of a flyback converter. A flyback converter is set. The flyback converter includes an input rectifier bridge DB1, an input capacitor Cin, a transformer T1, a power switch S1, and an output diode D1, an output capacitor Cout and a load circuit, wherein the input rectifier bridge DB1 is composed of semiconductor diodes.

[0044] A control circuit is provided, the control circuit is electrically connected to the flyback converter, and the control circuit includes a sampling resistor Rsen, an overcurrent comparator Comp1, a nonlinear overcurrent reference circuit, an RS flip-flop and a driver, wherein the nonlinear The over-current reference circuit provides an over-current protection reference voltage Vocp.

[0045] The overcurrent protection reference voltage Vocp is a voltage reference that varies nonlinearly with the duty ratio D of the transformer T1.

[0046] The contr...

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Abstract

The invention relates to a flyback converter overcurrent protection achieving method for a nonlinear circuit. A flyback converter is arranged and comprises an input rectifier bridge, an input capacitor, a transformer, a power switch, an output diode, an output capacitor and a load circuit. A control circuit is arranged and electrically connected with the flyback converter. The control circuit comprises a sampling resistor, an overcurrent comparator, a nonlinear overcurrent reference circuit, an RS trigger and a driver, wherein the nonlinear overcurrent reference circuit provides overcurrent protection reference voltage, and the overcurrent protection reference voltage is a voltage reference nonlinearly varying with a duty ratio of the transformer.

Description

technical field [0001] The invention relates to an output overcurrent protection method of a flyback converter applicable to a wide range of input conditions, in particular to a method for obtaining a maximum output current with good consistency when the output of the flyback converter in a nonlinear circuit is overloaded Methods. Background technique [0002] As we all know, because the flyback converter has the characteristics of few components, low cost and simple circuit, it has been widely used in small and medium power AC to DC switching power supplies at present. [0003] like figure 1 As shown, the traditional flyback converter generally consists of an input rectifier bridge DB1 composed of semiconductor diodes, an input capacitor Cin, a transformer T1, a power switch S1, an output diode D1 and an output capacitor Cout. [0004] In order to control the maximum output current, the traditional control circuit part also needs to be composed of sampling resistor Rsen, ...

Claims

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Application Information

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IPC IPC(8): H02H7/125
Inventor 张树刚陈炎张佳陈建
Owner AQUIL STAR PRECISION IND SHENZHEN
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