| 摘要 |
<p>A power conversion system for supplying AC power to a multiple phase, AC electric motor includes an inverter comprising a plurality of independently controllable switching devices for selectively coupling each phase of the motor to a source of unipolar electric power. A control processor selectively gates the controllable switching devices for controlling power to the motor. Each of the switching devices is bypassed by a respective one of a plurality of antiparallel connected diodes. The control processor in combination with current sensors determines the magnitude and direction of current in each phase of the motor. The control processor inhibits gating of the controllable switching devices when current in an associated one of the diodes exceeds a preselected magnitude so that the switching devices are not gated during a time at which the devices are reverse biased. In this manner, power consumption and heat dissipation in the devices and the associated gate driver circuit are reduced.</p> |
