Patent ID: 8000118

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; upon termination of the first electric pulse, closing the first switching section to deliver the controlled voltage to the primary transformer; opening the first switching section to stop delivery of the controlled voltage to the primary transformer prior to a start of a second electric pulse of the plurality of electric pulses being delivered to the primary transformer and generating a second magnetic flux in the core of the primary transformer; and closing the first switching section to deliver the controlled voltage to the primary transformer when the second electric pulse terminates, wherein closing the first switching section to deliver the controlled voltage to the primary transformer comprises: delivering the DC magnetizing current through the first switching section to the voltage source to reduce a first component of the first magnetic flux; when the first component of the first magnetic flux is zero: opening the first switching section; closing a second switching section; and delivering the controlled voltage from the voltage source through the second switching section to the primary transformer to build a second component of the first magnetic flux; and when the second component of the first magnetic flux is a predetermined value, opening the second switching section, wherein the second switching section is opened prior to the start of the second electric pulse, and wherein the first component and the second component of the first magnetic flux have opposite polarity.