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Ripple suppression circuit of output current

A technology of ripple suppression and output current, applied in the field of DC_DC switching power supply, can solve the problems of high cost, large size of LDO, high power consumption, etc., and achieve the effect of low cost, small size and high efficiency

Inactive Publication Date: 2017-03-22
LEIHUA ELECTRONICS TECH RES INST AVIATION IND OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The output current ripple suppression effect of this method is very good, but the cost is high, the power consumption is high, and the LDO with high current is large in size

Method used

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  • Ripple suppression circuit of output current
  • Ripple suppression circuit of output current
  • Ripple suppression circuit of output current

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Embodiment Construction

[0019] In order to make the objectives, technical solutions and advantages of the present invention clearer, the technical solutions in the embodiments of the present invention will be described in more detail below in conjunction with the drawings in the embodiments of the present invention. In the drawings, the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The described embodiments are some, but not all, embodiments of the invention. The embodiments described below by referring to the figures are exemplary and are intended to explain the present invention and should not be construed as limiting the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention. Embodiments of the present invention will be described in detail below ...

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Abstract

The invention discloses a ripple suppression circuit of output current. The ripple suppression circuit of the output current comprises an inductive circuit, a ripple cancellation circuit and a blocking circuit, wherein a primary-side dotted terminal of the inductive circuit is connected to an input end of an output filter inductor of a DC-DC switching power supply circuit as the input end; a secondary-side dotted terminal of the inductive circuit is connected to an output end of the blocking circuit as the input end; a primary-side non-dotted terminal of the inductive circuit is connected to the output end of the output filter inductor of the DC-DC switching power supply circuit as the output end; a secondary-side non-dotted terminal of the inductive circuit is connected to the input end of the ripple cancellation circuit as the output end; the input end of the blocking circuit is connected to a cathode of the DC-DC switching power supply circuit; and the output end of the ripple cancellation circuit is connected to an anode of the DC-DC switching power supply circuit. According to the ripple suppression circuit of the output current disclosed by the invention, an AC component in the output current of a DC-DC switching power supply can be cancelled to obtain a good ripple suppression effect; and the ripple suppression circuit also has the advantages of few components, low cost, high efficiency and small volume.

Description

technical field [0001] The invention relates to the technical field of DC-DC switching power supplies, in particular to an output current ripple suppression circuit. Background technique [0002] Switching power supply is a kind of power supply that uses modern power electronic technology to control the time ratio of switching on and off to maintain a stable output voltage. Compared with linear power supplies, switching power supplies usually have a larger ripple factor. However, the ripple factor is an important indicator of the switching power supply. If the ripple is large, it will affect the normal operation of the switching power supply load, and will bring problems such as amplifier noise and electromagnetic interference (EMI) noise. [0003] Usually, an LC filter circuit is added to the output end of the DC_DC switching power supply to suppress the output ripple. The power switching device works in the switching state, so that the voltage across the output filter in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/04H02M1/14
CPCH02M3/04H02M1/14
Inventor 方超张强谢君甫
Owner LEIHUA ELECTRONICS TECH RES INST AVIATION IND OF CHINA
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