MOS RECTIFIER, METHOD OF DRIVING MOS RECTIFIER, MOTOR-GENERATOR, AND ELECTRIC VEHICLE USING IT

摘要

PROBLEM TO BE SOLVED: To provide a MOS rectifier, which is possible of rectifying operation even at open phase of phase voltage, a method of driving the MOS rectifier, and an electric vehicle using it.

SOLUTION: A V-phase upper arm open phase detecting circuit 142U outputs a permission signal to allow the conduction of a lower arm MOSFET 111 of U phase in case that the phase voltage of V phase is higher than the positive electrode potential of a battery. A U-phase lower arm driver circuit 131 drives a U-phase lower arm MOSFET 111 with this permission signal. A V-phase arm open phase detecting circuit 142L outputs a permission signal to allow the conduction of an upper arm MOSFET 101 of U phase in case that the phase voltage of V phase is lower than the negative electrode potential of the battery. An upper arm driver circuit 121 of U phase drives the U-phase upper arm MOSFET 101 with this permission signal.

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