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A switching frequency control method and system

A switching frequency and control method technology, applied in control/regulating systems, instruments, regulating electrical variables, etc., can solve the problems of output voltage overshoot, output voltage instability, etc., to ensure control, ensure stability, and avoid output voltage. overshoot effect

Active Publication Date: 2020-11-17
SHENZHEN SUPLET
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  • Claims
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Problems solved by technology

[0003] In view of this, the present invention provides a switching frequency control method and system to solve the problem in the prior art that the output voltage overshoots at light load, resulting in unstable output voltage. The specific solution is as follows:

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  • A switching frequency control method and system
  • A switching frequency control method and system
  • A switching frequency control method and system

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Embodiment Construction

[0048] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of the present invention.

[0049] The invention discloses a switching frequency control method, the flow chart is as figure 1 Shown, including:

[0050] Step S11: Obtain the loop compensation voltage;

[0051] The loop compensation voltage can be a voltage value directly collected, or a voltage value obtained through calculation.

[0052] Specifically, it can be: directly collecting the loop compensation voltage C through the loop compensation voltage sampling circuit...

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Abstract

The invention discloses a switching frequency control method and system. The switching frequency control method comprises the steps of: obtaining loop compensation voltage, comparing the loop compensation voltage with the high point and the low point of the pre-set loop compensation voltage, so that a comparison result is obtained, if the comparison result satisfies a first pre-set condition, starting intermittent wave generation, determining the intermittent wave generation period and the intermittent wave generation time, and performing intermittent wave generation according to the loop compensation voltage, the intermittent wave generation period and the intermittent wave generation time. According to the scheme, when the loop compensation voltage and the pre-set high point and low point satisfy the first pre-set condition, intermittent wave generation is started; therefore, control on switching frequency PWM wave generation is realized; control on transmission energy is controlled;the condition that the output voltage is overshot is avoided; and the stability of the output voltage is ensured.

Description

Technical field [0001] The invention relates to the field of electronic circuits, in particular to a switching frequency control method and system. Background technique [0002] In the traditional switching frequency control mode, usually, the output voltage V out Overshoot may occur at light load, resulting in unstable output voltage at light load or no load. Summary of the invention [0003] In view of this, the present invention provides a switching frequency control method and system to solve the problem of overshoot in the output voltage at light load in the prior art, which causes the output voltage to be unstable. The specific solutions are as follows: [0004] A switching frequency control method includes: [0005] Obtain loop compensation voltage; [0006] The loop compensation voltage is compared with the preset loop compensation voltage low point and loop compensation voltage high point to obtain a comparison result, wherein the loop compensation voltage low point is smalle...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G05F1/625
CPCG05F1/625
Inventor 李酉王海峰
Owner SHENZHEN SUPLET
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