High Voltage Power Supply Control

SYSTEM

HIGH VOLTAGE POWER SUPPLY CONTROL : System Description


SYSTEM DIAGRAM







INPUT/OUTPUT SIGNAL CHART







DESCRIPTION

VCM activates system main relay 1, system main relay 2, and the pre-charge relay inside the Li-ion battery to connect the high voltage circuit to the Li-ion battery in response to the READY operation, a driver operation, like connecting the charge cable to the charging port, or VCM timer function.
Moreover, the high voltage circuit of the EV system has a pre-charge circuit to protect the high voltage circuit from sudden application of high voltage current.

CONTROL FLOW

To connect the high voltage circuit, VCM first activates the system main relay 2 and pre-charge relay. As a result, the high voltage power is supplied to the respective systems via the pre-charge resistor in the precharge circuit. When the condenser inside the traction motor inverter is fully charged by the applied power, the traction motor inverter transmits a high voltage power supply preparation completion signal to VCM. Receiving the signal, VCM activates the system main relay 1 and deactivates the pre-charge relay. Then, normal power is supplied to the respective systems.