LOAD DRIVE DEVICE, CHARGE CONTROL METHOD FOR POWER STORAGE APPARATUS THEREIN AND COMPUTER READABLE RECORDING MEDIUM ON WHICH PROGRAM FOR MAKING COMPUTER EXECUTE CHARGE CONTROL IS RECORDED

摘要

PROBLEM TO BE SOLVED: To provide a load drive device which materializes a function for supplying electric power from an auxiliary battery to the main power source at a low cost when a charged state of the main power source is lowered at system startup.

SOLUTION: When the charged state of the main power source is lowered at system startup, relays 9 and 10 are closed and an auxiliary battery 8 is connected to the neutral point and node N2 of an auxiliary motor 6. In an auxiliary system inverter 5, switching transistors 51a-51c of the lower arm are activated on the basis of a command from a control circuit 11. By employing a coil of the auxiliary motor 6 as a reactor, a voltage output from the auxiliary battery 8 is stepped up and output to the main power source 1 to charge. At this time, a drive system inverter 3 and a DC/DC converter 7 are stopped. When the charged state of the main power source 1 becomes sufficient, relays 9 and 10 are opened to drive respective loads.

COPYRIGHT: (C)2003,JPO