Deriving The Control-To-Output Transfer Function Of The Weinberg Converter

by Christophe Basso, Future Electronics, Toulouse, France, How2Power Today, Oct 15 2024

Focus:
The Weinberg converter is a buck-derived current-fed push-pull topology, which has gained popularity in space applications up to several kilowatts, owing to its robustness and almost ripple-free output current. A modified version of this topology corrects the voltage asymmetry originally affecting the primary-side power switch waveforms. As with any switching converter intended to be operated in closed loop, the stabilization exercise starts with obtaining the control-to-output transfer function of the power supply. In this article, starting with Vorpérian’s model of the PWM switch, the author derives large- and small-signal models of a modified version of the Weinberg converter operated in voltage- mode control. Then he applies fast analytical circuits techniques (FACTs) to derive the desired transfer function. He verifies its correctness by checking the responses obtained for this transfer function in Mathcad with simulation results obtained in SIMPLIS.

What you’ll learn:

• How to obtain the large signal and small signal responses of Ed Bloom’s modified Weinberg converter under voltage-mode control
• How to derive the control-to-output transfer function of the Weinberg converter

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