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In computer and telecommunication power supplies, the front end DC-DC stage is required to operate with a wide input voltage range to provide hold up time when AC voltage fails. Conventional LLC converter serving as the DC-DC stage is not suitable for this task, as the normal operation efficiency at 400Vin will be penalized once the converter is designed to achieve high peak gain, i.e. the wide input...
This paper proposes a novel high voltage-gain LLC micro-converter for PV applications. The converter has simple structure and minimum components with low cost. It can realize high voltage gain based on the voltage doubler rectifier with the optimal turns ratio. The main power switches can achieve ZVS and the output diodes can realize ZCS in wide input and load range. By utilizing the voltage doubler...
The interleaving and phase shedding techniques on LLC resonant converters will increase the load capacity, reduce the output current ripple and improve the efficiency. However, conventional frequency-controlled LLCs will lose regulation in individual phases if all phases are synchronized for interleaving, causing current imbalance. Existing load-sharing solutions for multiphase LLCs cannot achieve...
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