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A switching power supply filter circuit

A filter circuit, switching power supply technology, applied in electrical components, output power conversion devices, etc., can solve problems such as failure to successfully filter common mode interference signals, inductor saturation, etc.

Active Publication Date: 2018-03-16
HUAWEI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] When the commonly used switching power supply filter circuit is used in a non-isolated switching power supply, the current flowing into the two-wire common-mode inductor is not equal, so that the inductor is saturated, and the common-mode interference signal cannot be successfully filtered out.

Method used

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  • A switching power supply filter circuit
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Embodiment Construction

[0027] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0028] The embodiment of the present invention discloses a switching power supply filter circuit, which is used to realize the filtering of a switching power supply with a non-isolated structure. Each will be described in detail below.

[0029] see figure 1 , figure 1 It is a structural diagram of a switching power supply filter circuit disclosed in an embodiment of the present invention. like figure 1 As shown, the switching power supply filter circuit in...

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Abstract

The embodiment of the present invention discloses a filter circuit for a switching power supply. The filter circuit for a switching power supply includes filter capacitors C1 to C4, a common-mode inductor L1, and a non-isolated power conversion module U1, wherein the filter capacitor C1, filter capacitor C3, and common-mode inductor L1 is used to filter common-mode interference signals, filter capacitor C2 and filter capacitor C4 are used to filter differential-mode interference signals, and non-isolated power conversion module U1 is used for voltage conversion. By implementing the embodiment of the present invention, filtering of a non-isolated switching power supply can be realized.

Description

technical field [0001] The invention relates to the technical field of electronic circuits, in particular to a switching power supply filter circuit. Background technique [0002] In the switching power supply, the circuit works in the switching state, so it is easy to generate electromagnetic interference signals. When the interference signal is the interference signal returned from the live wire or the neutral wire of the power supply through the ground wire, the interference signal is a common mode interference signal. When the interference signal is When the interference signal is returned from the live line through the neutral line, the interference signal is a differential interference signal. Since the interference signal can be transmitted through radiation and conduction, the interference signal not only affects the normal operation of its own power supply circuit, but also affects the normal operation of the load circuit. Commonly used switching power supply filte...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M1/14
Inventor 赵为阳王彦斌王再兴
Owner HUAWEI TECH CO LTD
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