Patent ID: 8593768
Filing Date: 2013-11-26
Classification: H02M,H02P

Abstract:
1. A drive circuit for delivering high-level power to an AC motor, the drive circuit comprising: a high power circuit including a set of semiconductor switching devices capable of being coupled to the motor and delivering the high level power thereto; a logic circuit generating signals to control the semiconductor switching devices; a low power circuit to transmit the signal from the logic circuit to the high power circuit only when the low power circuit is receiving electrical power; and a safety relay having a contact connected to a power terminal of the low power circuit to control the application of power to the low power circuit. wherein the safety relay is electrically isolated from the logic circuit; wherein the safety relay is coupled to an override port of the low power circuit, and wherein the safety relay disables the low power circuit by providing a first signal to the override port of the low power circuit.