Switching power supply with few input current ripples

A switching power supply and current ripple technology, applied in the direction of output power conversion devices, electrical components, etc., can solve the problem that the dynamic performance of the circuit is difficult to meet the requirements, and achieve the effect of simple structure, flexible design and adjustment, and low input current ripple.

Active Publication Date: 2013-06-26
HARBIN INST OF TECH SHENZHEN GRADUATE SCHOOL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, after the steady-state performance is guaranteed, the dynamic performance of the circuit is often difficult to meet the requirements.

Method used

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  • Switching power supply with few input current ripples
  • Switching power supply with few input current ripples
  • Switching power supply with few input current ripples

Examples

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Embodiment Construction

[0015] Such as figure 2 As shown, the present invention discloses a switching power supply for realizing low input current ripple, including a boost circuit and a ripple cancellation branch, the boost circuit includes a center-tapped inductance module of an input filter inductor, and the ripple The offsetting branch is bridged between the output end of the boost circuit and the middle tapped inductance module of the input filter inductance.

[0016] The center-tapped inductance module of the input filter inductance is composed of an inductance L1, an inductance L2, and a mutual inductance M connected in series.

[0017] The ripple cancellation branch includes an auxiliary inductance L connected in series R and storage capacitor C R composition.

[0018] The boost circuit further includes a switch S, a capacitor C, and a resistor R, and the switch S, the capacitor C, and the resistor R are connected in parallel with each other.

[0019] The boost circuit further includes a...

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PUM

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Abstract

The invention provides a switching power supply with few input current ripples. The switching power supply comprises a boosted circuit and a ripple offset branch. The boosted circuit comprises a center tap type inductance module of an input filter inductor, and the ripple offset branch is bridged between an output end of the boosted circuit and the center tap type inductance module of the input filter inductor. The switching power supply with few input current ripples has the advantages that a center tap is led out from the input filter inductor of the traditional boosted circuit, and is used with an auxiliary inductor and an energy-storage capacitor which are small in size and are light, so that a converter has few input current ripples and is high in dynamic response assuredly, and the switching power supply with few input current ripples is simple in structure, flexible in design and adjustment and high in practicality.

Description

technical field [0001] The invention relates to a switching power supply, in particular to a switching power supply realizing low input current ripple. Background technique [0002] In the traditional step-up switching power supply design, in order to ensure low input current ripple, a single-stage or multi-stage filtering link is usually added at the input end, or a two-phase interleaving method is used to achieve mutual cancellation of the input current. Its structure is as follows: figure 1 As shown, Vin is the input voltage, Vout is the output voltage, L is the input filter inductance, and D is the freewheeling diode. The traditional step-up circuit is formed by the above devices. [0003] In the actual design process of low input current ripple switching power supply, in order to ensure that the input current ripple is small, it is necessary to select a larger input filter inductance L, at this time the dynamic characteristics of the circuit will slow down due to the in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M1/14
Inventor 张东来谷雨
Owner HARBIN INST OF TECH SHENZHEN GRADUATE SCHOOL
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