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An adaptive secondary-side digital control is proposed for the series resonant converter to solve the loss of ZVS under certain input and load conditions, making it a good candidate for MHz 48V voltage regulators (VRs). By means of varying AC equivalent resistance, the output voltage regulation is achieved by controlling the duty cycle of the synchronous MOSFET. An additional control variable has...
In order to improve the input impedance of stacked boost converter (SBC) that processes only a part of the total power delivery, the traditional three-capacitor structure is optimized as single-capacitor structure in this paper. Then small signal models of push-pull SBC based on these two capacitor structures are set up, the loop gain and input impedance are analyzed and compared. Finally, the effectiveness...
This paper presents the output current balancing method for three-phase interleaved full-bridge LLC resonant converter which employs a Y-connected rectifier. The proposed Y-connected rectifier is capable of boosting the output voltage without increasing the transformer's turn ratio. Especially, the frequency of the output ripple of the rectifier is six times higher than the switching frequency, thereby...
In this paper, a plug-in electric vehicle battery charger is proposed based on SEPIC PFC and LLC topologies. In addition, a new approach in introduced to actively control the dc link voltage and track the maximum efficiency point of a LLC converter over the wide voltage range of the high voltage battery pack. Comprehensive circuit modeling and loss analysis at maximum efficiency point of LLC converter...
In this paper, a novel approach to determine the small signal model of an LLC resonant converter is presented. The proposed model uses analysis techniques from communications theory to determine the control-to-output transfer function required for the design of a digital compensation network. The model considers the effects of higher order harmonics and sideband frequencies generated by the variable...
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