Patent ID: 7230395

Claim:
A voltage converting circuit for electric vehicles comprising: a high voltage battery for supplying electric power to a vehicle drive motor; an inverter, which is interposed between said high voltage battery and said vehicle drive motor and has a capacitor, for converting a direct current, supplied from said high voltage battery, to an alternating current and supplying to said vehicle drive motor; a voltage converter, connected to said high voltage battery in parallel with said inverter, for converting a voltage of said high voltage battery to a low voltage and outputting said low voltage; a contactor circuit, interposed between said high voltage battery and said inverter, for performing a process of suppressing rush current relative to said inverter when supplying electric power of said high voltage battery to said vehicle drive motor; and voltage converter start-up enabling means for enabling start-up of said voltage converter when a conclusion of the suppression process performed by said contactor circuit is sensed.