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Method and circuit for adjusting PWM driving signal of isolating switch power supply

A technology for isolating switching power supply and driving signal, applied in the field of power electronics, can solve the problems of high cost, difficult control, complicated circuit, etc., and achieve the effect of low cost, easy control and simple circuit

Inactive Publication Date: 2021-06-25
HAWUN ELECTRONICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is to provide a simple circuit, low cost, and easy control for adjusting the isolated switching power supply for the defects of the above-mentioned circuits in the prior art that are relatively complex, high in cost, and difficult to control. Method and circuit of PWM driving signal

Method used

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  • Method and circuit for adjusting PWM driving signal of isolating switch power supply
  • Method and circuit for adjusting PWM driving signal of isolating switch power supply
  • Method and circuit for adjusting PWM driving signal of isolating switch power supply

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Embodiment Construction

[0022] Embodiments of the present invention will be further described below in conjunction with the accompanying drawings.

[0023] Such as figure 1 As shown, in the method and circuit embodiment of the PWM drive signal for adjusting the isolated switching power supply of the present invention, the circuit includes an output sampling unit 1, a level signal forming unit 2 and a control unit 3; The output voltage sampling of the isolated switching power supply, the output voltage sampling value is obtained and transmitted to the level signal forming unit 2; the level signal forming unit 2 converts the output sampling value into two independent level signals, and sent to the control unit 3 respectively; the control unit 3 adjusts or does not adjust the duty cycle of the current PWM drive signal output by it according to the level values ​​of the obtained two independent level signals, so that the isolation The output voltage value of the switching power supply is maintained with...

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Abstract

The invention relates to a method for adjusting a PWM driving signal of an isolating switch power supply. The method comprises the following steps of: acquiring a sampling value of an output voltage at an output end of the isolating switch power supply; comparing the sampling value with different reference values to obtain two independent level signals; and separately transmitting the two independent level signals to a control unit of the isolating switch power supply, and allowing the control unit to adjust the duty ratio of the PWM driving signal output by the control unit according to the level values of the two independent level signals. The invention also relates to a circuit for adjusting the PWM driving signal of the isolating switch power supply. The method and the circuit for adjusting the PWM driving signal of the isolating switch power supply have the following beneficial effects that the circuit is relatively simple, cost is relatively low, and control is relatively easy.

Description

technical field [0001] The invention relates to the field of power electronics, more specifically, to a method and circuit for adjusting a PWM driving signal of an isolated switching power supply. Background technique [0002] In an isolated switching power supply, usually according to the output voltage value of the isolated switching power supply, the on-time and off-time control of the switching device is realized by adjusting the duty cycle of the PWM driving signal of the switching device, so that the output voltage maintains within the set range. In an isolated switching power supply, the primary and secondary grounds of the transformer are isolated from each other, and the output voltage can only be sampled at the secondary side of the transformer. Therefore, the commonly used secondary loop control method in the prior art is generally output The loop control signal is isolated and fed back to the primary-side analog signal through the optical coupler, and the primar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M1/08H02M3/335
CPCH02M1/08H02M3/33515H02M3/33523
Inventor 崔荣明宋栋梁王跃斌
Owner HAWUN ELECTRONICS CO LTD
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