Core Viewpoint - AOSemi is a comprehensive power semiconductor supplier that integrates design, development, production, and global sales, focusing on the electric vehicle (EV) onboard charger (OBC) market [1]. Group 1: Product Overview - The AOS 6.6KW bidirectional EV onboard charger (OBC) is designed for universal single-phase input with an output voltage range of 250 VDC to 450 VDC [3]. - The OBC features a front-end composed of a totem pole bidirectional Power Factor Correction (PFC) and a bidirectional isolated DC/DC stage using a symmetrical CLLC converter [3]. - The input and output of the bidirectional isolated DC/DC stage utilize H-bridge topology, with isolation provided by a high-frequency transformer [3]. Group 2: Technical Specifications - The OBC demonstration board uses AOM040V75X2Q and AOK060V75X2Q SiC MOSFETs, rated at 750V, with on-resistances of 40mΩ and 60mΩ respectively [6]. - The input voltage range is 90 VAC to 265 VAC, providing an isolated output voltage of 250 VDC to 450 VDC [6]. - The system includes protections for input and output, such as under-voltage, over-voltage, and over-current protections [10][16]. Group 3: Performance Metrics - The OBC operates with a peak efficiency of 96% [15]. - The PFC operates at a fixed frequency of 65 kHz, while the DC/DC CLLC stage operates at approximately 200 kHz [15]. - The maximum power output is limited to 6.6 kW in AC/DC mode and 3.3 kW in DC/AC mode [16]. Group 4: Features and Functionality - The OBC supports a wide input voltage range of 85-265 VAC and a wide output voltage range of 250-450 VDC [16]. - It includes multiple fault LED displays and allows for switching between AC/DC and DC/AC modes [19].