Device and method for suppressing low-frequency fluctuation of pulse-cycle skip modulation switching converter

Abstract

The invention discloses a device for suppressing the low-frequency fluctuation of a pulse-cycle skip modulation switching converter. The device comprises a control circuit and a power circuit, wherein the control circuit comprises a voltage detection device, a reference voltage, a comparator, a D trigger, an AND gate and a drive circuit; the voltage detection device and the reference voltage are connected with the comparator; the comparator is connected with the D trigger, and connected with the drive circuit through the AND gate; the power circuit comprises an input, a switching device, a filtering device, an output and an RC integrating device; the input is connected with the switching device, connected with the filtering device and the RC integrating device through the switching device, and enters the output through the filtering device and the RC integrating device; and the drive circuit is connected with the switching device of the power circuit. With the adoption of the method disclosed by the invention, in the case that a load of a switching power supply is suddenly changed, a controller can rapidly respond, so that the switching power supply rapidly recovers a steady state; and moreover, the output voltage is small in ripple waves and capable of being subjected to cycle skip modulation, so that the low-frequency fluctuation of the converter is suppressed, and the ripple waves of an inductive current and the output voltage are synchronous.

Description

technical field [0001] The invention relates to a low-frequency fluctuation suppression system and a suppression method thereof, in particular to a low-frequency suppression method for a continuous conduction mode cross-period modulation switching converter. Background technique [0002] With the rapid development of power electronics technology, the relationship between power electronic equipment and people's work and life is becoming increasingly close, and electronic equipment is inseparable from a reliable power supply. Compared with the traditional linear regulated power supply, the switching power supply has the advantages of high efficiency and small size, which makes the switching power supply technology gradually become a hot spot in people's application and research. The rapid development of power electronic devices has provided a large development space for switching power supplies, making it develop in the direction of small size, light weight, high efficiency, a...

AI Technical Summary

Problems solved by technology

The purpose of the present invention is to solve the ripple low frequency phenomenon in the circuit through the method of inductive current injection; another purpose of the present invention is to suppress the low frequency fluctuation of the continuous conduction mode cross-cycle modulation switching converter

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