Patent ID: 7839254

Claim:
A transformer circuit with high voltage isolation comprising: a) a sequence of at least two balun cores comprising a first balun core and a second balun core; b) a first circuit operable to carry an alternating current signal at a low voltage; c) the first balun core having at least two holes through the core; d) the first circuit looped through the at least two holes in the first balun core at least one time, as a primary winding of a first transformer; e) an intermediate circuit looped through the at least two holes in the first balun core at least one time, as a secondary winding of the first transformer, wherein the intermediate circuit is coupled to a mid-level on a direct current signal source; f) the second balun core having at least two holes through the core; g) the intermediate circuit looped through the at least two holes in the second balun core at least one time, as a primary winding of a second transformer; h) an output circuit looped through the at least two holes of the second balun core at least one time, as a secondary winding of the second transformer, wherein the output circuit is coupled to a high voltage direct current signal source to provide a direct current bias to the alternating current signal with a high level of voltage isolation between the first circuit and the output circuit, wherein the high voltage generator provides a direct current bias greater than 1000 volts to the alternating current signal.