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A single-stage direct ac-dc bidirectional resonant converter is proposed. It features natural power factor correction and theoretically gives rise to an ideal sinusoidal ac current. It confines high-frequency circulating current to one bridge as a means to reduce conduction loss. Zero-current switching is achieved in all ac-side switches while zero-voltage switching is achieved in at least two dc-side...
A new single-stage ac-dc resonant DAB converter and modulation scheme is proposed. The resonant network is based on a tuned ������ structure that ensures unity-power-factor operation at both ports. Due to the immittance characteristic of the tuned resonant network, the low-frequency ac input current of the DAB converter is directly...
A variable structure control law is determined which will ensure the control system reaches the sliding mode in finite time and has prescribed reaching transient response. The concept of perturbation compensator is incorporated to mitigate the effects of modelling errors and hence the problem of chattering. For this purpose, a simple but novel technique is proposed to estimate the dynamic perturbation...
A design procedure is developed for obtaining smooth continuous path tracking with variable structure controller. The planned trajectories are used to construct a continuous switching curve to eliminate the undesirable reaching phase. Algorithms are proposed to specify the rate of approach to the switching surfaces such that the frequency of switching of the controller can be reduced. Smooth sliding...
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