Power supply system with function of short circuit detection

Details Power supply system with function of short circuit detection Power supply system with function of short circuit detection

2008-07-29

2010-02-02

Duda, Rina I (Department: 2837)

Electricity: motive power systems

Induction motor systems

Primary circuit control

C318S812000

Reexamination Certificate

active

07656116

ABSTRACT:
There are provided upper and lower switching elements1U to1W and2U to2W for energizing motor drive windings4U to4W, a control circuit20that starts outputting a control signal for energization based on an energization instruction, pre-drive circuits8U to8W and9U to9W for controlling ON/OFF of the upper and lower switching elements based on the control signal, and short circuit detection circuits10U to10W for detecting short circuits in a node14between the upper and lower switching elements to higher-potential and lower-potential power sources based on the control signal and a voltage of the node. The short circuit detection circuits are controlled to detect a short circuit in the node to the lower-potential power source with all the upper switching elements turned ON and all the lower switching elements turned OFF and to detect a short circuit in the node to the higher-potential power source with all the upper switching elements turned OFF and all the lower switching elements turned ON, in a state where the motor drive windings are not energized. It is possible to prevent a situation in which a short circuit cannot be detected depending on a resistance component of a drive target.

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