Patent ID: 8030862

Claim:
A method for applying power to a direct current (DC) motor, said method comprising: connecting at least one protection device in series with at least one of a plurality of DC voltage input terminals; connecting a first conductor of a three conductor alternating current (AC) voltage source to a first input of a rectification circuit, a second conductor of the three conductor AC voltage source to a second input of the rectification circuit, and a center conductor of the three conductor AC voltage source to a chassis ground; connecting a DC voltage source to an output of the rectification circuit through the at least one protection device, the DC voltage source capable of providing a voltage equal to or greater than a rectified voltage originating from the AC voltage source, the DC voltage source and at least one protection device in parallel with the output of the rectification circuit, the DC voltage source including a first source and a second source coupled in series and a common node therebetween; electrically connecting the DC voltage source and rectification circuit output to operational components of the DC motor, the at least one protection device oriented such that current output from the rectification circuit is not applied to the DC voltage input terminals; and electrically connecting the common node of the DC voltage source to the chassis ground.