| 摘要 |
PROBLEM TO BE SOLVED: To improve efficiency of an inverter and to abate a noise from a three-phase alternator. SOLUTION: An inverter system for a hybrid vehicle is equipped with the three-phase alternator 2 connected to an internal combustion engine 1, a rechargeable secondary battery 5, a step-up and step-down chopper circuit 49 which step up an output voltage of the secondary battery 5 to a desired DC voltage through a reactor 7 or step down the DC voltage to the voltage of the secondary battery 5, an inverter circuit 40 which converts an output voltage of the step-up and step-down chopper circuit 49 to AC and supplies the AC to the three-phase alternator for driving, and a control circuit 48 which controls the step-up and step-down chopper circuit 49 and the inverter circuit 40. The inverter system also control the three-phase alternator 2 with the inverter circuit 40 so that the stored energy of the secondary battery 5 assists the toque of the internal combustion engine 1 when the vehicle starts and accelerators. In this system, a control circuit 48 is equipped with a control means which stops step-up action of the step-up and step-down chopper circuit 49 when the three-phase alternator is at a predetermined speed or less and makes the inverter circuit 40 perform PWM controlling action by almost equalizing the DC voltage to the voltage of the secondary battery 5.
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