Anti-interference method and device for integrated controller in switching power supply and integrated controller

Abstract

The invention relates to the technical field of switching power supply control, and particularly discloses an anti-interference method for an integrated controller in a switching power supply, which comprises the following steps: acquiring a first turn-off control signal, and generating a first pulse delay signal according to the first turn-off control signal, wherein the rising edge of the first pulse delay signal is consistent with the first turn-off control signal, and the signal width of the first pulse delay signal is greater than or equal to preset interference time; a second turn-on control signal is obtained, a first anti-interference signal is generated according to the second turn-on control signal and the first pulse delay signal, and the first anti-interference signal can block interference of the first turn-off control signal on the second turn-on control signal. The invention further discloses an anti-interference device of the integrated controller in the switching power supply and the integrated controller. According to the anti-interference method for the integrated controller in the switching power supply, the problem of mutual signal interference between two stages of logic controllers in the integrated controller can be solved.

Description

technical field [0001] The invention relates to the technical field of switching power supply control, in particular to an anti-interference method for an integrated controller in a switching power supply, an anti-interference device for an integrated controller in a switching power supply, and an integrated controller. Background technique [0002] Two-stage or even multi-stage conversion circuits are commonly used in medium and high-power switching power supply applications. figure 1 Shown is a schematic diagram of a typical two-stage circuit, including the first-stage power factor correction (PFC) circuit ( figure 1 in the "1" box), the second-stage flyback converter ( figure 1 in the "2" box). In the application, according to the requirements of power and efficiency, the first stage circuit can have many changes, such as single-phase input or three-phase input and so on. The second stage circuit can also have many variations, such as a flyback converter, LLC converter...

AI Technical Summary

Problems solved by technology

[0007] The invention provides an anti-jamming method for an integrated controller in a switching power supply, an anti-jamming device for an integrated controller in a switching power supply, and an integrated controller, which solves the problems existing in the related art between the two-stage logic controllers in the integrated controller. The problem of signal interference

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