Power conversion device, converter control method and system

By combining operating condition identification and frequency dithering modulation with voltage closed-loop control, the converter control method solves the problem of unstable output voltage in buck converters under intermittent conduction mode, achieves electromagnetic interference suppression and output voltage stability, simplifies hardware and reduces costs.

CN122292880APending Publication Date: 2026-06-26NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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Patent Information

Authority / Receiving Office
CN Β· China
Patent Type
Applications(China)
Current Assignee / Owner
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
Filing Date
2026-05-28
Publication Date
2026-06-26

AI Technical Summary

Technical Problem

In the intermittent conduction mode of the buck converter, traditional frequency dithering control causes dynamic changes in the switching frequency, resulting in unstable output voltage and electromagnetic interference noise problems, which existing solutions cannot effectively solve.

Method used

The operating condition identification module monitors the voltage characteristics of the switching nodes. Combined with the frequency dithering modulation module and voltage closed-loop control, the duty cycle is adjusted in real time through the feedforward compensation module to generate a PWM drive signal to control the switching on and off of the converter.

Benefits of technology

It achieves stable output voltage and effective suppression of electromagnetic interference in intermittent conduction mode, reduces low-frequency ripple and noise, improves real-time control and system stability, simplifies hardware architecture and reduces cost.

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Abstract

This application discloses a power conversion device, a converter control method, and a system, belonging to the field of converter control technology. It includes: a condition identification module that monitors the voltage characteristics at the switching nodes of the converter and outputs an intermittent conduction mode enable signal; a frequency dithering modulation module that generates an instantaneous switching frequency based on a preset center frequency; a voltage closed-loop control module that determines a reference duty cycle based on the deviation between the converter's output voltage and a target reference voltage; and a feedforward compensation module that corrects the reference duty cycle based on the preset center frequency, the instantaneous switching frequency, and the intermittent conduction mode enable signal to obtain a corrected duty cycle. This application, through digital control and simple hardware, effectively eliminates low-frequency output voltage ripple caused by frequency dithering in intermittent conduction mode while retaining the significant electromagnetic interference reduction advantage of frequency dithering technology. It features low hardware cost, high system stability, and fast dynamic response.
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