Drive power supply and fail determination method

Details Drive power supply and fail determination method Drive power supply and fail determination method

2007-06-26

2007-06-26

Jackson, Stephen W. (Department: 2836)

Electricity: electrical systems and devices

Safety and protection of systems and devices

Motor protective condition responsive circuits

C361S018000

Reexamination Certificate

active

10369111

ABSTRACT:
A drive power supply for generating inverter drive voltages has a switching control circuit that switches a switching element on a primary side of a transformer to generate drive voltages on the secondary side in connection with the switching of switching elements of the inverter. A feedback circuit generates a feedback voltage corresponding to the drive voltages and supplies the feedback voltage to the switching control circuit to control the drive voltages. An abnormality detecting portion changes the feedback voltage when the voltage of a predetermined terminal fluctuates. Thus when an IG short involving the predetermined terminal occurs, the drive voltages are changed by the switching control circuit sensing the change in the feedback voltage. Since any change in the drive voltages is detected to reliably determine an abnormality, an IG short is detected as an abnormality even though the abnormality has been generated in the drive power supply independent of any prior change in the actual drive voltages.

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