Discrete model of DCS controlled half-bridge with current doubler for digital controller design

In this paper, a discrete model is developed for DCS controlled half-bridge topology with current-doubler to facilitate digital controller design when operating at high switching frequencies. The discrete model is derived and then compared with the classical continuous model. The model is represented in the versatile state-space form, which allows the application of a wide range of modern and classical control theories. The pulse transfer function for the modulator input to converter output voltage is derived for use in voltage mode control. To verify the theoretical frequency response predicted by the presented model, a laboratory prototype is built