Frequency regulation circuit and non-isolated power supply thereof

By monitoring the input-output voltage difference in real time and automatically adjusting the operating frequency of the step-down circuit using a frequency regulation circuit, the problems of waveform loss and oscillation in non-isolated power supplies are solved, the output voltage ripple is improved, and system stability is ensured.

CN224385364UActive Publication Date: 2026-06-19SHENZHEN DANENG CHUANGZHI SEMICON CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
SHENZHEN DANENG CHUANGZHI SEMICON CO LTD
Filing Date
2025-06-19
Publication Date
2026-06-19

AI Technical Summary

⚠Technical Problem

Existing non-isolated power supply BUCK DC/DC technology, when used in wide input voltage applications, suffers from problems such as waveform loss and oscillation in switching waveforms due to its fixed high operating frequency setting, which affects system stability.

⚗Method used

By monitoring the input-output voltage difference in real time, the operating frequency of the step-down circuit is automatically adjusted using a frequency adjustment circuit, which includes a sampling module, a control module, and an adjustment module, to achieve dynamic frequency adjustment.

🎯Benefits of technology

It effectively solves the problems of waveform loss and oscillation in wide input voltage applications, significantly improves output voltage ripple, and ensures stable and reliable operation of the system under various voltage combinations.

✦ Generated by Eureka AI based on patent content.

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Abstract

This utility model discloses a frequency adjustment circuit and its non-isolated power supply. The circuit includes a first sampling module, a second sampling module, a control module, and an adjustment module. The first sampling module is used to acquire the input voltage of the buck circuit; the second sampling module is used to acquire the output voltage of the buck circuit; the control module generates a control signal by comparing the difference between the input voltage and the output voltage with a preset voltage threshold; the adjustment module is configured to generate a frequency adjustment signal to the frequency adjustment pin of the buck circuit in response to the control signal, so as to adjust the operating frequency of the buck circuit. This utility model, by monitoring the input and output voltage difference in real time, automatically adjusts the operating frequency of the buck circuit when the voltage difference is greater than the preset threshold, which can effectively solve the problems of waveform loss and oscillation caused by a fixed high operating frequency setting in wide input voltage applications, and significantly improve the output voltage ripple.
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