Motor controller with optical scr's

Details Motor controller with optical scr's Motor controller with optical scr's

H - Electricity

02

P

318/115

H02P 27/02 (2006.01)

Patent

CA 1304122

ABSTRACT A three-phase electric motor is coupled to each phase line of an electric source by pairs of SCR's coupled in inverse parallel relationship. One of the SCR's in each pair is triggered by a signal from a conventional motor control circuit which regulates the phase angle at which the SCR turns on. The other SCR in each pair is an optically triggered device which is activated by light emitted from an LED in one of the legs of a three-phase rectifier bridge in the control circuit power supply. When the LED within a leg of the power supply is forward biased so as to conduct current, it emits light which triggers a correspondingly biased opto-SCR to supply current to the motor. A separate transistor is connected in parallel across each of the LED's to provide a current shunt path when the motor is to be turned off so that the LED does not emit light and trigger the SCR. -14-

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