Self-adaptive switching frequency regulator circuit

A switching frequency, adjusting circuit technology, applied in the direction of electrical components, output power conversion devices, etc., can solve the problem of low efficiency of switching converters, and achieve the effect of optimizing switching frequency configuration, high efficiency, and reducing electromagnetic interference

Active Publication Date: 2014-02-26
天健九方(西安)毫米波设计研究院有限公司
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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 switchi

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  • Self-adaptive switching frequency regulator circuit
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  • Self-adaptive switching frequency regulator circuit

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Embodiment Construction

[0046] The present invention will be described in further detail below with reference to the accompanying drawings.

[0047] refer to figure 1 , the adaptive switching frequency adjustment circuit of the present invention, comprising:

[0048] Mode discrimination module 1, threshold value selection module 2, basic oscillator logic 3, frequency shaking control logic 4 and controlled cycle current source 5; the mode discrimination module 1 includes three input terminals, and these three input terminals are respectively connected to the external high threshold The comparison voltage V_H, the feedback voltage FB and the external low-threshold comparison voltage V_L are connected to generate two comparison logic signals A and B, which are respectively transmitted to the threshold selection module 2; the threshold selection module 2 includes five input terminals and one output, wherein The first input terminal IN1 and the second input terminal IN2 are respectively connected to the ...

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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:...

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Application Information

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IPC IPC(8): H02M1/44
Inventor 来新泉王泽宇刘从邵丽丽
Owner 天健九方(西安)毫米波设计研究院有限公司
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