Power supply frequency modulation circuit, switching power supply and electronic equipment

Abstract

The invention relates to a switching power supply technology, and discloses a power supply frequency modulation circuit, a switching power supply and electronic equipment. The technical problem that the output voltage of the switching power supply can greatly drop when the load of the switching power supply is suddenly changed from a small load or even a no-load to a full load or a large load within an extremely short time is solved. The power supply frequency modulation circuit is applied to a switching power supply and comprises a frequency modulation module and a load information judgment module; the output end of the load information judgment module is connected with the input end of the frequency modulation module; the input end of the load information judgment module is used for being connected to one end of a load to detect load change in real time, and the output end of the frequency modulation module is used for being connected to the control end of a switching tube; and when the load information judgment module detects that the load rises, the load information judgment module outputs a control signal, so that the frequency modulation module increases the working frequency of the switching power supply at a preset rate.

Description

technical field [0001] The present application relates to the field of power supply technology, in particular to a power supply frequency modulation circuit, switching power supply and electronic equipment. Background technique [0002] The power adapter is a power supply conversion device for electronic equipment and electronic appliances. The power adapter is generally realized by a switching power supply. The load capacity of the power adapter is not only related to the peak current of the primary inductance of the transformer in the power supply, but also related to the entire switching power supply. Operating frequency (that is, switching frequency) is related. When the load is small, the switching frequency is generally small, and when the load is heavy, the switching frequency is generally relatively high, so the switching frequency of the power supply needs to be adjusted. [0003] In the traditional scheme, when the load increases, the frequency modulation module i...

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Problems solved by technology

[0005] The purpose of this application is to provide a power supply frequency modulation circuit, switching power supply and electronic equipment to solve the problem that in the traditional solution, when the load jumps from no-load to full load, the switching frequency of the switching power supply cannot be increased quickly, resulting in a drop in output voltage. Technical problems with large drops

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