Abstract
TheCLLC resonant converter has been widely used to obtaina high power conversion efficiency with sinusoidal current waveforms and a soft switching capability. However, it has a limited voltage gain range according to the input voltage variation. The current-fed structure canbe one solution to extend the voltage gain range for the wide input voltage variation, butit has a limited zero voltage switching (ZVS) range. In this paper, the current-fed CLLC resonant converter with additional inductance is proposed to extend the ZVS range. The operational principle is analyzed to design the additional inductance for obtaining the extended ZVS range. The design methodology of the additional inductance is proposed to maximize the ZVS capability for the entire load range. The performance of the proposed method is verified with a 20 W prototype converter.
Highlights
The small sized power converterhas become significant in various industries, such as lightings, TVs, computers, and other home appliances [1,2]
The wide band-gap device (WBD), such as gallium nitride (GaN) and silicon carbide (SiC), can increase the switching frequency up to several MHz compared with conventional silicon (Si)-based switching devices [16,17,18,19]
The CLLC resonant converter operating at the inductive region can obtaina zero voltage switching (ZVS) capability [20,21,22,23]
Summary
The small sized power converterhas become significant in various industries, such as lightings, TVs, computers, and other home appliances [1,2]. A soft switching capability is important to obtain a high power conversion efficiency in a high switching frequency operation [8,9,10]. The CLLC resonant converter operating at the inductive region can obtaina zero voltage switching (ZVS) capability [20,21,22,23]. The current-fed structure makes a limited ZVS capability of the low side switch, since the low side switch operates as the boost converter and resonant converter simultaneously. The increase of the ZVS capability is significant to obtain a high power conversion efficiency for the entire load condition.
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