A control algorithm to improve the dynamic performance of fractional-capacitance power supply

Through the segmented PI control algorithm, the dynamic performance of the fractional power supply is improved, the shortcomings of the traditional PI controller in current switching and voltage regulation time are solved, and fast and smooth current and voltage switching are achieved to meet stringent performance requirements.

CN115395782BActive Publication Date: 2025-09-09CENT SOUTH UNIV
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Patent Information

Application Number
CN202211056330.3
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2022-08-31
Publication Date
2025-09-09
Estimated Expiration
2042-08-31

AI Technical Summary

Technical Problem

Traditional PI controllers are difficult to achieve excellent dynamic performance while ensuring steady-state performance in fractional power supplies, especially in terms of current switching time, voltage regulation time and overshoot, which are difficult to meet stringent requirements.

Method used

A segmented variable PI control algorithm is adopted to divide the system operating conditions into six types according to the current switching situation. The integral coefficients of the current loop PI controller are designed respectively. Combined with the voltage loop of the traditional PI controller, this ensures that the current switching process is smooth and fast and the voltage regulation is rapid.

Benefits of technology

The dynamic performance improvement is achieved with current switching time less than 10ms, voltage regulation time less than 3s, current overshoot less than 10%, and voltage overshoot less than 0.1mV without affecting the steady-state accuracy.

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Abstract

The present invention provides a control algorithm for improving the dynamic performance of a fractional-capacity power supply. The disclosed control algorithm is based on dual closed-loop voltage and current control. The voltage loop is a classic PI controller, and the current loop is a step-by-step variable PI controller that varies with operating conditions. The algorithm is easy to implement and computationally simple. While maintaining the steady-state performance of the fractional-capacity power supply, it significantly improves the dynamic performance of the fractional-capacity power supply, including the rise time and overshoot of battery charge and discharge current switching, and the regulation time and overshoot of charge and discharge voltage.
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