An asymmetric duty ratio plus phase lead-in hybrid control method

By using a hybrid control method combining asymmetric duty cycle and internal phase shift, the internal phase shift ratio of the primary side full bridge and the duty cycle of the secondary side switching transistors in the dual active bridge DC/DC converter are controlled, solving the power backflow problem under light load and improving the converter efficiency and the simplicity of the control strategy.

CN114825968BActive Publication Date: 2026-06-09GUANGZHOU INST OF ENERGY CONVERSION CHINESE ACAD OF SCI
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
GUANGZHOU INST OF ENERGY CONVERSION CHINESE ACAD OF SCI
Filing Date
2022-05-26
Publication Date
2026-06-09

AI Technical Summary

Technical Problem

In dual active bridge converters, power backflow occurs under light load, leading to reduced converter efficiency and increased power device losses. Existing control methods have varying performance under different operating conditions, and the backflow power is relatively large when the voltage ratio deviates from 1, which limits the implementation range of soft switching.

Method used

An asymmetric duty cycle plus internal phase shift hybrid control method is adopted. By controlling the internal phase shift ratio D0 of the primary full-bridge and the forward duty cycle D of the secondary switch, and using given constraints and voltage ratio range, D0 and D are calculated and selected to control the direction and magnitude of power transmission, ensuring that the return power is zero.

Benefits of technology

It effectively reduces return current power under light load conditions, improves the efficiency of dual active bridge converters, simplifies control strategies, and enhances circuit efficiency.

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Abstract

The application discloses a kind of asymmetric duty cycle plus inner shift phase hybrid control methods for dual active bridge DC / DC converter, by controlling the primary side full-bridge inner shift phase ratio D0 and the secondary side switch tube forward duty cycle D of dual active bridge DC / DC converter Two variables determine the control of dual active bridge DC / DC converter, by given constraint condition and voltage variable ratio range, by the calculation and selection of D0 and D, the direction and size control of power transmission is realized while reducing the reflux power to zero.Compared with the existing dual active bridge converter control method, the reflux power of the circuit can be reduced to zero when the load is light in the method, and the control strategy is simple and easy to implement.
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