Abstract
A new circuit structure of LLC converter is studied and implemented to achieve wide zero-voltage switching range and wide voltage operation such as consumer power units without power factor correction and long hold up time demand, battery chargers, photovoltaic converters and renewable power electronic converters. The dc converter with the different secondary winding turns is adopted and investigated to achieve the wide input voltage operation (50–400 V). To meet wide voltage operation, the full bridge and half bridge dc/dc converters with different secondary turns can be selected in the presented circuit to have three different voltage gains. According to input voltage range, the variable frequency scheme is employed to have the variable voltage gain to overcome the wide input voltage operation. Therefore, the wide soft switching load variation and wide voltage operation range are achieved in the presented resonant circuit. The prototype circuit is built and tested and the experiments are demonstrated to investigate the circuit performance.
Highlights
Power electronics are more and more important for the energy conversion systems such as renewable power conversion, electric vehicle systems, traction vehicles, light rail vehicles, dc nano- or micro-grid systems, battery-based storage systems, personal computer power units and industry power units
Gallium Nitride (GaN) and SiC devices have the advantages of low switching loss and high frequency operation
The new resonant converter with voltage doubler configuration and two sets of secondary windings is presented in this paper to accomplish soft switching operation and overcome wide voltage input variation (Vin = 50–400 V)
Summary
Power electronics are more and more important for the energy conversion systems such as renewable power conversion, electric vehicle systems, traction vehicles, light rail vehicles, dc nano- or micro-grid systems, battery-based storage systems, personal computer power units and industry power units. Compared to IGBT, GaN and SiC devices, MOSFET elements have low cost and medium frequency operation for modern power converters. The resonant converter with interleaved duty cycle control was achieved in [14] to overcome wide voltage variation problem and achieve low current ripple input. The new resonant converter with voltage doubler configuration and two sets of secondary windings is presented in this paper to accomplish soft switching operation and overcome wide voltage input variation (Vin = 50–400 V). When Vin = 50–100 V (low voltage region), the full bridge type LLC circuit with more secondary turns is operated to have high voltage gain. If Vin = 100–200 V (medium voltage input region), the full bridge type LLC circuit with fewer secondary turns is adopted to have less dc voltage gain. The experimental verifications are provided to demonstrate the performance of the studied LLC resonant circuit
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