Abstract
Due to its high efficiency and simple circuitry, the LLC Resonant converter is frequently utilized in onboard charger applications. To realize constant current (CC) and constant voltage (CV) charging, the typical LLC converter with variable frequency control suffers from a wide switching frequency range and also loose the zero-voltage switching (ZVS) at CC charging mode. In this research, a unique LCL resonant converter with built-in CC and CV output characteristics is offered as an alternative to the conventional solution to this issue. The CC and CV charges are implemented in the suggested concept employing the inherent properties of LCL resonant converter as a current source and as a voltage source. This paper also reports a design technique of the LCL resonant converter to achieve output voltage within the desired range in both CC and CV mode. The proposed converter may accomplish zero-voltage-switching (ZVS) for all primary-side inverter switches and zero-current-switching (ZCS) for load side rectifier diode during CC charge operation as well as during CV charge operation, this ensures a high efficiency. A 3.6-kW prototype with 250 V input and 126.3-16S V output is designed and simulated. The simulated results validate the proposed converter in CC-CV charging mode in ZVS region.
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