Abstract
This paper proposes a novel multi-element resonant converter with self-driven synchronous rectification (SR). The proposed resonant converter can achieve a zero-voltage-switching (ZVS) operation from light load to full load, meanwhile, the zero-current-switching (ZCS) can achieve rectifiers of a secondary-side. Therefore, the switching losses can be significantly reduced. Compared with an LLC resonant converter, the proposed resonant converter can be effective to decrease the circulating energy through the primary-side of the transformer to output a load and provide a wide voltage gain range for over-current protection as well as decreasing the inrush current under the start-up condition. Moreover, the proposed converter uses a simple current detection scheme to control the synchronous rectification switches. A detailed analysis and design of this novel multi-element resonant converter with self-driven synchronous rectification is described. Finally, a DC input voltage of 380-VDC and an output voltage/current of 12-VDC/54-A for the resonant converter prototype is built to verify the theoretical analysis and performance of the proposed converter.
Highlights
IntroductionOver the last ten years, LLC resonant converters have been widely used in the power supply industry because LLC resonant converters have a lot of advantages such as zero voltage switching (ZVS)
Over the last ten years, LLC resonant converters have been widely used in the power supply industry because LLC resonant converters have a lot of advantages such as zero voltage switching (ZVS)on primary switches and the zero-current-switching (ZCS) can be achieved for the output rectifiers [1,2,3,4].the voltage stress ratings of the output rectifier only need two times the output voltage.the secondary conduction losses can be significantly reduced
When the LLC resonant converter is used during start-up condition, the huge inrush current will cause destructive damage
Summary
Over the last ten years, LLC resonant converters have been widely used in the power supply industry because LLC resonant converters have a lot of advantages such as zero voltage switching (ZVS). The LLC resonant converter still has some issues to be solved [12,13], such as short output circuit and overload conditions will cause a large peak in current through the switches of the primary-side. The current transformer (CT) to sense the current used to drive SRs has been proposed [17], but the magnetizing inductance of the transformer of the LLC resonant converter has been used for resonant inductance. When the CT sense the secondary-side current, which will cause large conduction losses through CT, so that it will reduce the conversion efficiency. Energies 2019, 12, 715 the secondary-side current, which will cause large conduction losses through CT, so that it will reduce the conversion efficiency. OutputSimilarly, circuit resonant frequency, which can decrease the inrush current solvecurrent short output circuit issues.
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