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Switching power supply output frequency adjustment circuit

A switching power supply and output frequency technology, applied in the field of switching power supply output frequency adjustment circuit, can solve the problems of power system efficiency reduction, system response speed deterioration, switching frequency reduction, etc., to improve system response speed, increase switching frequency, eliminate The effect of audio noise

Active Publication Date: 2019-04-09
SHANGHAI BEILING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Especially when the load of the switching power supply is reduced to close to no-load, the switching frequency will be significantly reduced, which will lead to a significant decrease in the efficiency of the power supply system, and the system response speed will be significantly worse

Method used

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  • Switching power supply output frequency adjustment circuit

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Embodiment Construction

[0043] The present invention is further illustrated below by means of examples, but the present invention is not limited to the scope of the examples.

[0044] Such as figure 1 As shown, the switching power supply output frequency adjustment circuit of the present invention includes a detection module 101 and an adjustment module 102, and the input power of the switching power supply charges an energy storage inductor through a power switch;

[0045] The first input terminal of the detection module 101 receives a feedback voltage VFB, the voltage value of the feedback voltage VFB is in a fixed ratio to the output voltage of the switching power supply system; the second input terminal of the detection module receives a sampling control pulse signal VSW , the sampling control pulse signal VSW is the same as the switching frequency of the power switch; the third input terminal of the detection module receives a first reference voltage VR1, and the output terminal of the detection...

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Abstract

The invention discloses a switching power supply output frequency regulating circuit which comprises a detection module and a regulation module. A first input end of the detection module receives a feedback voltage; a second input end of the detection module receives a sampling control pulse signal; a third input end of the detection module receives a first reference voltage, and an output end of the detection module outputs an error detection amplification signal; a first input end of the regulation module receives the error detection amplification signal, a second input end of the regulation module receives a second reference voltage, a third input end of the regulation module receives a frequency control voltage, and an output end of the regulation module outputs a frequency regulation voltage; and when a voltage of the error detection amplification signal is higher than the second reference voltage, the frequency regulation voltage is lower than the frequency control voltage, and when the voltage of the error detection amplification signal is not higher than the second reference voltage, the frequency regulation voltage is equal to the frequency control voltage. According to the switching power supply output frequency regulating circuit disclosed by the invention, a switching frequency of a power switch is improved, and effects of eliminating audio noise, improving system efficiency and promoting a system response speed are achieved.

Description

technical field [0001] The invention relates to an output frequency adjustment circuit of a switching power supply. Background technique [0002] As we all know, in a switching power supply system, the input power charges the energy storage inductor when the power switch is turned on, and the energy storage inductor discharges the load when the power switch is turned off. Usually the control circuit is designed so that the switching frequency of the power switch is proportional to the output current of the switching power supply system. By setting a frequency control voltage, it is used to set the peak value of the charging current of the energy storage inductor when the power switch is turned on each time, thus also The output current of the switching power supply system and the switching frequency of the power switch are set. [0003] For traditional control circuits, when the load of the switching power supply system decreases, that is, when the output current decreases,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M3/157
CPCH02M3/157
Inventor 李淼
Owner SHANGHAI BEILING
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