A power supply output ripple suppression device

By using a four-stage filtering structure and an active low-pass filter circuit, the problem of poor ripple signal suppression in existing technologies is solved, achieving efficient filtering across the entire frequency band and improved power supply stability.

CN224418683UActive Publication Date: 2026-06-26SICHUAN ZHIYUAN TIMES TECHNOLOGY CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
SICHUAN ZHIYUAN TIMES TECHNOLOGY CO LTD
Filing Date
2025-06-10
Publication Date
2026-06-26

AI Technical Summary

Technical Problem

In the existing technology, the two-stage filtering module is not effective in suppressing complex and variable ripple signals, and the ripple signal acquisition module is affected by high-frequency pulse interference, resulting in insufficient filtering accuracy.

Method used

It adopts a four-stage structure consisting of a coarse filter module, a multi-stage filter module, a fine filter module, and an LDO, combined with a π-type filter circuit, an active low-pass filter circuit, and a low-dropout linear regulator. It dynamically adapts to the ripple characteristics for layered filtering, and the filter circuit is controlled in real time by a ripple signal acquisition module and a controller.

Benefits of technology

It achieves efficient suppression of ripple across the entire frequency band, improves the stability and purity of power output, reduces voltage fluctuations, and enhances the filtering effect.

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Abstract

The utility model belongs to power ripple relevant technical field, concretely relates to a power output ripple suppression device, including PWM controller, diode D1, coarse filter module, multistage filter module, fine filter module and LDO that connect gradually, the output of coarse filter module is connected with ripple signal acquisition module, and the output of ripple signal acquisition module is connected with controller, the utility model discloses through coarse filter module, multistage filter module, fine filter module, four level structure scheme of LDO, makes the ripple that power output end produces is layered filtering, covers full frequency band, and coarse filter module filters out high frequency ripple preferentially, reduces subsequent filtering pressure, and multistage filter module dynamic adaptation residual specific ripple characteristic, and fine filter module is further high accuracy filtering to middle low frequency ripple, and can through operational amplifier gain compensation signal attenuation that filtering brings, and LDO can further stabilize output voltage, reduce voltage fluctuation, improve the stability and purity of power output, make filtering effect improve significantly.
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