Self-adaptive switching frequency regulator circuit

Abstract

The invention discloses a self-adaptive switching frequency regulator circuit which mainly solves the problem that in the prior art, a switching convertor only has high efficiency in a narrow load range. The self-adaptive switching frequency regulator circuit comprises a pattern discrimination module, a threshold selection module, fundamental oscillation logic, jitter frequency control logic and a controlled current source. The pattern discrimination module detects external feedback voltage FB to generate two comparison logic signals which are subjected to logical operation in the threshold selection module, low-threshold voltage of a comparer in the fundamental oscillation logic is determined, the fundamental oscillation logic outputs clock signals and is used for driving the jitter frequency control logic to generate a set of control signals to control output current of the controlled current source, frequency jitter is achieved, and electromagnetic interference of the switching convertor is lowered. The self-adaptive switching frequency regulator circuit is high in reliability, all functions can be integrated in a chip, and the self-adaptive switching frequency regulator circuit can be applied to various power supply management systems.

Description

technical field [0001] The invention belongs to the technical field of electronic circuits, in particular to a switching frequency adjustment circuit, which can be used for analog integrated circuits. Background technique [0002] The adaptive switching frequency adjustment circuit is an important part of the switching converter system, which is composed of several modules inside the converter system. Compared with linear regulators, switching converters are more and more popular due to their high efficiency and high energy density. However, the traditional switching converter mode of operation has two inherent disadvantages. First, a single fixed switching frequency will generate large electromagnetic interference EMI; second, a single switching frequency is not suitable for improving converter efficiency in a wide load range. [0003] At present, the ways to improve the efficiency of switching converters include burst mode and fixed frequency reduction mode, among which:...

AI Technical Summary

Problems solved by technology

Although this mode can improve the efficiency to a certain extent, it is prone to the situation that the efficiency of the switching converter is very low under certain load conditions due to the fact that only two frequencies are allocated in a wide load range

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