Power supply detection device and test method thereof

By collecting and processing the voltage signal of the high-frequency switching power supply in a closed-loop state, generating time-correlated signal pairs and performing Fourier transform, identifying the phase angle of the Nyquist curve intersection, and generating a chaotic distortion index based on the local curvature change characteristics, the problems of measurement distortion and insufficient load dynamic reflection in the loop stability test of the high-frequency switching power supply are solved, and the accuracy and reliability of the loop stability assessment are improved.

CN120703628AInactive Publication Date: 2025-09-26ZHE JIANG ZHONG TONG TONG XIN YOU XIAN GONG SI
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Patent Information

Application Number
CN202510753553.2
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-06-06
Publication Date
2025-09-26
Estimated Expiration
Not applicable · inactive patent

AI Technical Summary

Technical Problem

Existing loop stability test methods for high-frequency switching power supplies suffer from measurement distortion and insufficient load dynamic reflection in high-frequency operating scenarios, resulting in deviations between margin assessment results and actual operating conditions.

Method used

In the closed-loop state, the switching node voltage ripple signal of the high-frequency switching power supply is collected as the disturbance input signal, and the output voltage feedback signal is collected synchronously. The time-correlated signal pair is generated by time domain alignment and Fourier transform is performed to extract the amplitude-frequency and phase-frequency characteristics of the open-loop transfer function. The characteristics are mapped to the Nyquist plane to identify the intersection phase angle, and the chaotic distortion index is generated based on the local curvature change characteristics for correction.

Benefits of technology

This effectively avoids the phase measurement distortion introduced by traditional methods due to disconnecting the control loop, ensures that the measurement is performed under real load dynamics and complete loop characteristics, and significantly improves the accuracy and reliability of the phase margin evaluation results.

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Abstract

The invention discloses a power supply detection device and a test method thereof, particularly relates to the field of power electronic control, and is used for solving the problems of high-frequency phase distortion and incapability of reflecting a stability boundary under a real load dynamic state in an open-loop state caused by introduction of additional impedance due to disconnection of a loop in an existing open-loop injection test method. A switching node voltage ripple signal is synchronously collected as a disturbance input signal and an output voltage feedback signal is synchronously collected as a response output signal in a power supply closed-loop state; performing time domain alignment on the two signals to generate a time correlation signal pair; fourier transform is carried out on the signal pair to extract open-loop transfer function characteristics; mapping the characteristics to an intersection phase angle of a Nyquist plane identification curve and a unit circle; generating a chaos distortion index based on the local curvature change characteristics of the Nyquist curve of the intersection neighborhood; and correcting the phase angle of the intersection point by using a chaotic distortion index, and outputting a loop stability evaluation conclusion according to a correction result, thereby realizing high-precision stability evaluation of uninterrupted closed-loop control.
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