Patent ID: 8289735

Claim:
A method for delivering a controlled voltage, the method comprising: during a first electric pulse of a plurality of electric pulses delivered to a primary transformer, holding a first switching section open to isolate the controlled voltage, wherein the first electric pulse creates a first magnetic flux in a core of the primary transformer, and wherein the first magnetic flux generates a direct current (DC) magnetizing current; receiving the controlled voltage from a voltage source using the DC magnetizing current at the first switching section; and upon termination of the first electric pulse, closing the first switching section to deliver the controlled voltage to the primary transformer, wherein an add-on transformer comprises a primary winding, a first secondary winding, and a second secondary winding, wherein the primary winding of the add-on transformer is connected to a secondary winding of the primary transformer, wherein the first secondary winding of the add-on transformer is configured to provide the DC magnetizing current to the voltage source, and wherein the second secondary winding is configured to provide power to control the first switching section.