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Interleaved switching power supply and control method thereof

A switching power supply, interleaved technology, applied in the field of interleaved parallel switching power supply and its control, can solve the problems of poor dynamic response, complicated compensation design, etc.

Active Publication Date: 2015-04-01
SILERGY SEMICON TECH (HANGZHOU) CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The out-of-phase control of the interleaved parallel switching power supply in the prior art usually adopts the fixed-frequency control method, such as using a fixed out-of-phase clock signal to make the two main switching tubes conduct in the out-of-phase, but its dynamic response is poor, and the compensation design is relatively poor. cumbersome

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  • Interleaved switching power supply and control method thereof
  • Interleaved switching power supply and control method thereof
  • Interleaved switching power supply and control method thereof

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Embodiment Construction

[0050] Several preferred embodiments of the present invention are described in detail below with reference to the accompanying drawings, but the present invention is not limited to these embodiments. The present invention covers any alternatives, modifications, equivalent methods and arrangements made within the spirit and scope of the present invention. In order to give the public a thorough understanding of the present invention, specific details are described in detail in the following preferred embodiments of the present invention, and those skilled in the art can fully understand the present invention without the description of these details.

[0051] refer to figure 2Shown is a circuit block diagram of a parallel interleaved switching power supply according to the present invention. In the embodiment of the present invention, the parallel interleaved switching power supply includes two parallel step-down power stage circuits, but is not limited to this. The power suppl...

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Abstract

The invention discloses an interleaved switching power supply and a control method thereof. The control method includes the following steps: an AC ripple signal is generated according to switching control signals of a plurality of power level circuits; the AC ripple signal is then superposed with an output voltage feedback signal; after a signal generated after the superposition is compared with a reference voltage signal, frequency division is carried out to obtain continuity signals of the power level circuits; certain phase angles exist among phases of the continuity signals after the frequency division, so that phase-staggered continuity of main switching tubes can be achieved. The interleaved switching power supply provided by the invention has the advantages of accurate phase stagger, rapid response and good effect.

Description

technical field [0001] The invention relates to the field of switching power supplies, and more particularly, to an interleaved parallel switching power supply and a control method thereof. Background technique [0002] In the switching power supply, in order to improve the power density of the power supply and reduce the output voltage ripple, the main circuit of the power supply often adopts a staggered parallel connection. like figure 1 Shown is an implementation of the parallel interleaved switching power supply in the prior art. The first main switch Q1 and the second main switch Q2 in the two-way Buck circuit in interleaved parallel are 180° out of phase and conduct, and the inductance current i L1 and i L2 The ripples cancel each other out, so that the output current frequency is increased to 2 times of the original, the output current ripple is greatly reduced, and the output voltage ripple will also be greatly reduced. Capacitor, compared with the traditional si...

Claims

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Application Information

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IPC IPC(8): H02M3/10
CPCH02M3/10H02M3/1584H02M3/1586H02M1/14H02M1/0025
Inventor 蔡勇斌陈圣军
Owner SILERGY SEMICON TECH (HANGZHOU) CO LTD
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