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Modeling and Control of Push-pull DC-DC Converter

Liu Kecheng

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Abstract

The state-space averaging method is used to derive the small-signal transfer function for non-ideal power level circuit of voltage mode(VM) pull-push DC-DC converter in CCM,and obtain the amplitude-frequency and phase-frequency curves of the power level circuit in the converter by simulation.The optimization design of feedback compensation circuit can improve the stability and dynamic characteristics of VM pull-push DC-DC converter.The Bode plots of the power level circuit and the whole open-loop system are tested with network analyzer Agilent 4395A,which verifies that the model and the control loop design are accurate.The close-loop load dynamic response of the push-pull DC-DC converter is also tested with the oscilloscope.The result proved the correctness of the modeling and control design.

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What this paper is about

The state-space averaging method is used to derive the small-signal transfer function for non-ideal power level circuit of voltage mode(VM) pull-push DC-DC converter in CCM,and obtain the amplitude-frequency and phase-frequency curves of the power level circuit in the converter by simulation.The optimization design of feedback compensation circuit can improve the stability and dynamic characteristics of VM pull-push DC-DC converter.The Bode plots of the power level circuit and the whole open-loop system are tested with network analyzer Agilent 4395A,which verifies that the model and the control loop design are accurate.The close-loop load dynamic response of the push-pull DC-DC converter is also tested with the oscilloscope.The result proved the correctness of the modeling and control design.

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Available abstract

The state-space averaging method is used to derive the small-signal transfer function for non-ideal power level circuit of voltage mode(VM) pull-push DC-DC converter in CCM,and obtain the amplitude-frequency and phase-frequency curves of the power level circuit in the converter by simulation.The optimization design of feedback compensation circuit can improve the stability and dynamic characteristics of VM pull-push DC-DC converter.The Bode plots of the power level circuit and the whole open-loop system are tested with network analyzer Agilent 4395A,which verifies that the model and the control loop design are accurate.The close-loop load dynamic response of the push-pull DC-DC converter is also tested with the oscilloscope.The result proved the correctness of the modeling and control design.

Key concepts: Bode plot, Flyback converter, Forward converter, Control theory (sociology), Transfer function, DC bias, Electronic engineering, Closed-loop transfer function

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