A capacitor voltage decoupling and balancing control system and method for a four-level flying capacitor converter

By using a capacitor voltage decoupling balance control system for a four-level flying capacitor converter, the capacitor voltage is independently controlled by calculating the duty cycle and phase shift angle. This solves the complexity of capacitor voltage balance control and achieves capacitor voltage stability and safe equipment operation.

CN122247193APending Publication Date: 2026-06-19WUHAN INSTITUTE OF MARINE ELECTRIC PROPULSION (THE 712TH RESEARCH INSTITUTE OF CHINA STATE SHIPBUILDING CORP LTD)
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
WUHAN INSTITUTE OF MARINE ELECTRIC PROPULSION (THE 712TH RESEARCH INSTITUTE OF CHINA STATE SHIPBUILDING CORP LTD)
Filing Date
2026-04-03
Publication Date
2026-06-19

AI Technical Summary

Technical Problem

In a four-level flying capacitor converter, how to achieve reliable, fast, and decoupled balanced control of the capacitor voltage, avoid the dependence of complex control strategies on the dynamics of the inductor current, and ensure uniform voltage stress on the switching elements and stable operation of the equipment?

Method used

A capacitor voltage decoupling balance control system for a four-level flying capacitor converter is adopted. By combining a sampling module, an output voltage closed-loop control module, a capacitor charge calculation module, a decoupling calculation module, and a PWM signal generation and driving module, a PWM signal is generated to independently control the capacitor voltage by calculating the duty cycle and phase shift angle, thereby achieving capacitor voltage balance.

Benefits of technology

It achieves capacitor voltage balance across the entire load range, reduces voltage stress on the switching transistor, improves system stability and robustness, simplifies the control process, and facilitates the design and optimization of control parameters.

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Abstract

This invention discloses a capacitor voltage decoupling balance control system for a four-level flying capacitor converter, including a sampling module connected to the four-level flying capacitor converter, and an output voltage closed-loop control module, a capacitor charge calculation module, and a decoupling calculation module connected to the sampling module. The output voltage closed-loop control module and the decoupling calculation module are connected to a PWM signal generation and driving module. The invention also discloses its control method. This invention avoids the influence of inductor current magnitude on conventional variable duty cycle control and achieves independent control of the capacitor voltage through decoupling operations, facilitating the design of controller parameters by technicians and thus ensuring the stability of the capacitor voltage balance system.
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