Switch power magnetic isolation reactive circuit for feeding back output voltage error signal

An output voltage error, switching power supply technology, applied in the output power conversion device, the conversion of DC power input to DC power output, electrical components and other directions, can solve the problems of long debugging cycle, high cost, many components, etc., to achieve radiation resistance The effect of strong illumination and interference ability, less component consumption and wide application range
CN102185485AActive Publication Date: 2011-09-14SHENZHEN ACAD OF AEROSPACE TECH
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
SHENZHEN ACAD OF AEROSPACE TECH
Publication Date
2011-09-14

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Abstract

The invention relates to a switch power magnetic isolation reactive circuit for a feeding back output voltage error signal. The invention provides a switch power magnetic isolation reactive circuit for a feeding back output voltage error signal, comprising an output voltage comparison unit, a magnetic isolation feedback unit and a rectifier unit, wherein the output voltage comparison unit is usedfor sampling, comparing and compensating output voltage Vout of a DC / DC switch power supply, thus obtaining an output voltage error signal; the magnetic isolation feedback unit is used for chopping the output voltage error signal obtained by the output voltage comparison unit, thus obtaining a pulse square wave signal; furthermore, the magnetic isolation feedback unit can send the signal to a primary side by a magnetic feedback transformer; the rectifier unit is used for carrying out half-wave rectifying on the pulse square wave signal obtained by the magnetic isolation feedback unit, thus obtaining feedback voltage Vfb and outputting the feedback voltage Vfb to a primary side control chip so as to realize the closed ring controlling on the output voltage. The switch power magnetic isolation reactive circuit has the benefits that a circuit is simple, few elements are adopted, the application scope is wide, and the switch power magnetic isolation reactive circuit can be widely applied to the application in which the magnetic isolation feedback is required and has strong radiation resistance and strong interference resistance.
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Description

technical field

[0001] The invention relates to a switching power supply, in particular to a switching power supply magnetic isolation feedback circuit for feeding back an output voltage error signal in the switching power supply. Background technique

[0002] At present, there are two isolation feedback methods for switching power supplies: optocoupler isolation feedback and magnetic isolation feedback. The optocoupler isolation feedback method relies on the linear working area of ​​the optocoupler to isolate and feed back the output voltage error signal to the primary controller for pulse width adjustment, thereby realizing the overall power supply voltage regulation control. The disadvantage of this feedback method is that the linear working area of ​​the optocoupler needs to be used for isolated feedback, and the transmission ratio of the optocoupler device in the linear working area is prone to drift with temperature and time, and its radiation resistance is poor. Thes...

Claims

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