Patent ID: 8198850

Claim:
A DC motor drive including power electronics and control electronics, the power electronics arranged to receive a high voltage power supply and to controllably output that supply to a DC motor to controllably operate the motor, and the control electronics arranged to receive a low voltage power supply and to control operation of the power electronics and hence of the motor at least partly in response to signals received by the control electronics indicative of at least one potential difference across the power electronics, wherein the drive further includes signal generation and transmission means arranged to sense the output of the power electronics, wherein the signal generation and transmission means includes circuitry arranged to sense a current of the output of the power electronics by measuring the potential difference across an impedance connected to the output of the power electronics and calculating the current based thereon, and to generate based thereon the signals in a form for wireless transmission between the output of the power electronics and the control electronics, thereby allowing galvanic isolation of the control electronics from the power electronics.