Abstract
In this paper, a load adaptive control method to improve the efficiency and dynamic performance of the Phase-Shifted Full-Bridge (PSFB) converter which works under a wide range of load conditions is presented. The proposed control method can be used as a battery charger since this application demands a wide range of load conditions. The composition of the PSFB converter’s losses and the loss analysis model are both discussed. According to this model, the optimum switching frequency which results in minimum power loss is adopted to improve the efficiency. The relationship between switching frequency and power loss is formulated over a wide load range. Indicated by this kind of relationship, the proposed controller adjusts the switching frequency at different load currents. Moreover, an adaptive gain adjustment controller is applied to replace the traditional controller, with the aim to improve the dynamic performance which is influenced by the changes of the switching frequency and load current. In addition, the experimental results show that the maximum improvement of efficiency is up to 20%. These results confirm the effectiveness of the proposed load adaptive control method.
Highlights
To improve the efficiency of battery chargers, resonant converters are adopted to realize zero-voltage switching (ZVS)
Considering its high efficiency and high power density, the phase-shifted full-bridge (PSFB) converter is applied in this paper
A load adaptive control method to improve the efficiency of the PSFB converter which works under a wide range of load conditions is presented
Summary
To improve the efficiency of battery chargers, resonant converters are adopted to realize zero-voltage switching (ZVS). The PSFB converter provides ZVS for all primary switches, the switching losses can be reduced significantly, and high efficiency and low Electro-Magnetic Interference (EMI) can be achieved [1,2]. This converter has been widely employed in high power density applications, the converter operates under a wide range of load variations in battery charger applications [3,4]. A wide range of ZVS can be obtained for the PSFB converter with clamp diodes and a resonant inductor, as proposed in [7] All these proposed converters extend the ZVS range by adding an auxiliary circuit that provides enough energy to achieve complete ZVS for all switches. The additional auxiliary circuit increases cost, complexity and causes extra losses
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