Electricity: electrical systems and devices – Safety and protection of systems and devices – Motor protective condition responsive circuits
Patent
1996-04-17
1997-08-19
Gaffin, Jeffrey A.
Electricity: electrical systems and devices
Safety and protection of systems and devices
Motor protective condition responsive circuits
318701, 310 68C, H02H 504
Patent
active
056594526
ABSTRACT:
A method of operating a switched reluctance machine is disclosed, which provides electrical current overload protection. The stator winding motor drive employs a high-side semiconductor switch, along with a corresponding high-side gate driver (which incorporates a bootstrap-type drive circuit). A low-side semiconductor switch, and a corresponding gate driver is also used to thereby define a two-switch per phase topology. The high-side MOSFET switch gate driver must have rising, and falling edges from an associated controller in order for the bootstrap drive power supply portion to function. A drive controller is configured so that it will generate these rising, and falling edges only when the motor is moving, as indicated by a speed signal. Therefore, if the motor stops moving, due to an unexpected load, such as a seized pump connected to an output shaft thereof, the speed signal will so indicate the stall, wherein the controller will not generate a signal having rising and falling edges. A bootstrap capacitor in the bootstrap drive circuit will slowly discharge in the absence of pulses from the controller. Once discharged to a predetermined level, the drive circuit will no longer be able to cause the high-side semiconductor switch to conduct, thus breaking the circuit, and interrupting current flow through the stator winding.
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"HV Floating MOS-Gate Drive IC"; International Rectifier, Application Notes; AN-978A; 1990.
Dana Corporation
Gaffin Jeffrey A.
Sherry Michael J.
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