The below figure shows the electric system in a mild HEV (such as 48V B-ISG or BAS), explain: What type of power electronics device (rectifier, inverter, buck, boost, or ...) is needed between these two voltage systems (48V and 12V)? 12V 48V Power 12V Load 12V Starter/ (Cold Crank) 48V Starter/ Battery Generator Load 48V Load 12V 12V Electronic 48V 48V Load Battery Device GND GND

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HVDC

HVDC stands for high voltage direct current in the electric power transmission system. The high voltage direct current system uses direct current (DC) for the transmission of electrical power through transmission lines in contrast with the alternating current that is the AC system. The HVDC is used to transmit bulk power point-to-point through long distances transmission lines. Power is rapidly transferred because the efficiency of transmission lines is greatly increased over long distances due to HVDC lines.