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Power supply parallel low-ripple output control method

A technology of output control and low ripple, applied in the field of power supply, can solve the problems of affecting industrial production, increasing the output ripple of parallel power supply, weakening the output stability of parallel power supply, etc., so as to reduce ripple and improve output stability , Guarantee the effect of output quality

Inactive Publication Date: 2014-05-28
SICHUAN INJET ELECTRIC CO LTD
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Problems solved by technology

However, in current applications, multiple power modules are simply connected in parallel to form a parallel power supply. The excitation pulse signals of each power module are exactly the same (same frequency, same phase), so the ripples generated by each power module will be superimposed. , which increases the output ripple of the parallel power supply, weakens the output stability of the parallel power supply, and ultimately reduces the output quality of the parallel power supply, affecting industrial production

Method used

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  • Power supply parallel low-ripple output control method
  • Power supply parallel low-ripple output control method
  • Power supply parallel low-ripple output control method

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Embodiment Construction

[0012] The present invention will be further described in detail below in conjunction with test examples and specific embodiments. However, it should not be understood that the scope of the above subject matter of the present invention is limited to the following embodiments, and all technologies realized based on the content of the present invention belong to the scope of the present invention.

[0013] refer to figure 1 , n power supply modules are connected in parallel to form a parallel power supply. The power supply parallel connection low ripple output control method provided by the present invention is to provide each power supply module with phase-staggered The excitation pulse signal, that is to say, the phase difference of the excitation pulse signal of every two adjacent power modules . phase difference The excitation pulse signals of the n channels are respectively output to the pulse width modulation module (module # control in the figure), and the pulse w...

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Abstract

The invention discloses a power supply parallel low-ripple output control method. The method is used for controlling a parallel power supply which is formed by parallel connection of n power supply modules and controlling differing phases of excitation pulse signals of two adjacent power supply modules. According to the power supply parallel low-ripple output control method, by differing the phases of the excitation pulse signals of each power supply module in the parallel powder supply, phases of ripples generated by each power supply module are differed, and therefore, ripple waves generated by each power supply module are not overlapped, ripples of the parallel power supply are reduced, output stability is increased, and output quality is guaranteed.

Description

technical field [0001] The invention relates to the technical field of power supplies, in particular to a control method for parallel connection of power supplies with low ripple output. Background technique [0002] The output stage of the DC switching power supply is usually connected to an LC filter circuit. The current in the inductor L will fluctuate up and down the effective value of the output current, so the current of the capacitor C will also fluctuate, and a ripple with the same frequency as the switching power supply will be generated at the output end. Parallel power supply has high working efficiency and large power capacity, so parallel power supply is widely used in modern industrial fields. However, in current applications, multiple power modules are simply connected in parallel to form a parallel power supply. The excitation pulse signals of each power module are exactly the same (same frequency, same phase), so the ripples generated by each power module wi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M1/14
Inventor 邱文杰邓永华
Owner SICHUAN INJET ELECTRIC CO LTD
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