Patent ID: 9178447
Filing Date: 2015-11-03
Classification: H02P

Abstract:
1. A control circuit for a motor of a HVAC system, the motor including at least a first tap and a second tap, the motor configured to operate at a first parameter when the first tap is energized and at a second different parameter when the second tap is energized, the control circuit comprising: a solid state switching device for coupling to the first tap of the motor; and a control device coupled to the solid state switching device, the control device configured to switch the solid state switching device to apply a first control signal to the first tap, in response to a demand for operation of the motor at the second parameter, to operate the motor at the second parameter, the control device configured to switch the solid state switching device to apply a second control signal to the first tap, in response to a demand for operation of the motor at the first parameter, to operate the motor at the first parameter; wherein the solid state switching device is a bipolar junction transistor having a base, an emitter and a collector, wherein the base is coupled to the control device, and wherein the collector is coupled to a power supply; and wherein the control circuit further comprises: