Method and apparatus for preventing overheating in an...

Details Method and apparatus for preventing overheating in an... Method and apparatus for preventing overheating in an...

2004-10-21

2008-10-28

Ro, Bentsu (Department: 2837)

Electricity: motive power systems

Automatic and/or with time-delay means

Responsive to thermal conditions

C318S272000, C318S434000, C318S400210, C361S103000

Reexamination Certificate

active

07443123

ABSTRACT:
A control circuit for a motor includes a voltage regulator having a thermal shutdown apparatus that turns off the voltage regulator when the temperature of the control circuit rises above a pre-determined threshold level, wherein the voltage regulator is used to provide power to a plurality of insulated gate bipolar transistors controlling a plurality of stator windings of the motor. Thus the voltage regulator prevents the control circuit and the various components on the control circuit from being damaged from overheating. An embodiment of the control circuit is adapted to generate an error code in response to the shutdown of the voltage regulator and to monitor the operation of the motor to ensure that the motor has been turned off and then on before turning on the power supply to a plurality of phase windings.

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