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Multiphase converter and control circuit and method thereof

A multi-phase converter and control circuit technology, applied in control/regulation systems, DC power input conversion to DC power output, instruments, etc., can solve problems such as uneven phase distribution

Active Publication Date: 2021-02-26
SG MICRO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in fact, the parameters of different phases (such as inductance, etc.) are different. If a phase difference is fixed between each phase, it is difficult to ensure that the frequency difference between each phase converter is always 360 / N under different switching frequencies. degrees, making the phase distribution uneven

Method used

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  • Multiphase converter and control circuit and method thereof
  • Multiphase converter and control circuit and method thereof
  • Multiphase converter and control circuit and method thereof

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Embodiment Construction

[0035] Various embodiments of the invention will be described in more detail below with reference to the accompanying drawings. In the various drawings, the same elements are denoted by the same or similar reference numerals. For the sake of clarity, various parts in the drawings have not been drawn to scale.

[0036] It should be understood that in the following description, a "circuit" refers to a conductive loop formed by at least one element or sub-circuit through electrical or electromagnetic connections. When an element or circuit is said to be "connected to" another element or an element / circuit is said to be "connected between" two nodes, it can be directly coupled or connected to the other element or there can be intervening elements and the connection between elements can be be physical, logical, or a combination thereof. In contrast, when an element is referred to as being "directly coupled to" or "directly connected to" another element, there are no intervening e...

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Abstract

The invention discloses a multi-phase converter and a control circuit and a control method thereof. The multi-phase converter comprises multi-phase power stage circuits connected in parallel between an input end and an output end, and the on and off of a main switching tube of each phase of power stage circuit are controlled by a switching signal of a corresponding phase. The control circuit comprises a multi-correlation cut-off timing circuit, a multi-phase switch control circuit and a multi-phase frequency control circuit, and each phase frequency control circuit is used for detecting the switching frequency of a switching signal of a corresponding phase and fixing the switching frequency of the switching signal at a corresponding reference frequency; therefore, the switching signal of each phase is kept working at a fixed reference frequency and phase shift, and the ripple of the output voltage can be optimized through the superposition of multi-phase inductive current.

Description

technical field [0001] The present invention relates to the technical field of switching power supplies, and more specifically, to a multi-phase converter and its control circuit and control method. Background technique [0002] In switching power supply technology, in order to reduce output ripple and improve power supply stability and power, a multi-phase parallel topology is usually used. Each channel of the multiphase converter has a corresponding power switch tube and inductor, the input terminals of all channels of the multiphase converter are connected together to receive the input voltage, and the output terminals are commonly connected to the input terminal of the output filter circuit of the multiphase converter , to provide the output voltage through the output filter circuit. This topology has the advantages of mutual cancellation of ripple, phase-to-phase shunting, and high-frequency output voltage with low switching frequency. [0003] Multi-phase converters ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/158
CPCH02M3/1584H02M3/1586
Inventor 易新敏邓扬扬
Owner SG MICRO
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