Active filtering circuit capable of inhibiting switch power supply from outputting high frequency voltage ripples

A technology of high-frequency voltage and switching power supply, which is applied in the direction of output power conversion devices and electrical components, and can solve problems such as high-frequency voltage ripple

Active Publication Date: 2018-10-26
BEIJING MECHANICAL EQUIP INST
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0006] In view of the above analysis, the present invention aims to provide an active filter circuit that suppresses the high-frequency voltage ripple output by the switching power supply to solve the problem of high-frequency voltage ripple in the existing active power filter

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  • Active filtering circuit capable of inhibiting switch power supply from outputting high frequency voltage ripples
  • Active filtering circuit capable of inhibiting switch power supply from outputting high frequency voltage ripples

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Embodiment Construction

[0042] Preferred embodiments of the present invention will be specifically described below in conjunction with the accompanying drawings, wherein the accompanying drawings constitute a part of the application and together with the embodiments of the present invention are used to explain the principle of the present invention, but not to limit the scope of the present invention.

[0043] A specific embodiment of the present invention discloses an active filter circuit that suppresses the high-frequency voltage ripple output by a switching power supply, such as figure 1As shown, it includes signal input terminal Vin+, signal input terminal Vin-, regulated power supply module, filter module, feedback control module, N-type power MOSFET tube V1, signal output terminal Vo+, signal output terminal Vo-; signal input terminal Vin+, The signal input terminal Vin- is respectively connected to the positive input terminal and negative input terminal of the regulated power supply module, th...

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Abstract

The invention relates to an active filtering circuit capable of inhibiting a switch power supply from outputting high frequency voltage ripples and belongs to the technical field of active filtering circuits. A problem is solved that an active power filter outputs high frequency voltage ripples in the prior art. The active filtering circuit comprises a signal input end Vin+, a signal input end Vin-, a voltage stabilizing power supply module, a filtering module, a feedback control module, an N-type power MOSFET V1, a signal output end Vo+ and a signal output end Vo-. According to the invention,by use of control output switching characteristics of the N-type power MOSFET V1, through cooperation of the voltage stabilizing circuit module, the filtering module and the feedback control module,objectives of effectively inhibiting high frequency voltage ripples and reducing circuit losses are achieved.

Description

technical field [0001] The invention relates to the technical field of active filter circuits, in particular to an active filter circuit for suppressing high-frequency voltage ripple output by a switching power supply. Background technique [0002] With the advantages of wide input power range, high efficiency, and high power density, switching power supplies are widely used in the field of power consumption for electronic equipment. With the development of information technology, components such as microprocessors and precision sensors in electronic equipment are gradually increasing. In order to ensure the stable and reliable operation of these components, the output voltage ripple amplitude of the power supply is required to be controlled at a low level. The working principle of switching power supply involves the switching process of power switching devices. High-frequency ripple will be superimposed on the output power supply voltage, and the output voltage ripple ampli...

Claims

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Application Information

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IPC IPC(8): H02M1/15
CPCH02M1/15
Inventor 熊永波
Owner BEIJING MECHANICAL EQUIP INST
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