Patent ID: 6930457

Claim:
A motor control circuit comprising: a motor having a motor winding and a plurality of brushes; a first filter circuit connected to a first and second brush of the plurality of brushes, wherein the first filter circuit has a first and second inductor and a capacitor, and wherein a first end of the first inductor is connected to the first brush, a first end of the second inductor is connected to the second brush, and the capacitor is connected between the second end of the first and second inductors; a battery in communication with the motor for energizing same; a relay in selective communication with the battery and the first filter circuit for selectively providing battery power to the motor; a ground return circuit in communication with at least one of the plurality of brushes, wherein an electrical return path is created through the relay from the at least one brush back to the motor; and a second filter circuit in communication with a third brush, wherein the third brush is a common brush, the second filter circuit creating a common brush ground path from the common brush to an electrical ground, and wherein a second filter circuit includes an inductor in series with a capacitor.