DC-DC CONVERTER


The DC-DC converter decreases the direct current high voltage of the drive battery to approximately 14 V to supply the electric power to the electric component and for charging the auxiliary battery.
Construction

System configuration

When the PHEV-ECU inputs the operation enable signal into the DC-DC converter with the electric motor switch in the READY condition or under the charging conditions (normal charge or quick charge), the DC-DC converter should decrease the direct current high voltage of the drive battery down to the auxiliary battery power supply voltage. The decreased auxiliary battery power supply voltage is output from the B terminal to the auxiliary battery or to the electric component. The DC-DC converter monitors the terminal voltage of the auxiliary battery through the S terminal, and adjusts the output voltage so that the terminal voltage of the auxiliary battery can be maintained at approximately 14 V.

AUXILIARY BATTERY CHARGE WARNING LAMP



If the DC-DC converter is not driven or if the DC-DC converter detects the abnormality, the operation monitor signal should be sent to the PHEV-ECU via the CAN. The PHEV-ECU receives the signal and lights the auxiliary battery charge warning indicator of the combination meter through the CAN.