Method and apparatus for canceling ripple current in a lamp

A method for reducing ripple current in a circuit comprising:

• connecting a first terminal of a first inductive element to a first terminal of a second inductive element at an output terminal B;
• impressing a first source of switching potential from an external source at a second terminal of the first inductive element at an input terminal A;
• and
• impressing a second source of switching potential from the external source out-of-phase with the first source of switching potential at a second terminal of the second inductive element at an input terminal C, such that a ripple current across the output terminals B and D is substantially minimal.

An apparatus for reducing ripple current in a circuit comprising:

• means for connecting a first terminal of a first inductive element to a first terminal of a second inductive element at an output terminal B;
• means for impressing a first source of switching potential from an external source to a second terminal of the first inductive element at an input terminal A;
• and
• means for impressing a second source of switching potential from the external source out-of-phase with the first source of switching potential to a second terminal of the second inductive element at an input terminal C, such that a ripple current across the output terminals B and D is substantially minimal.

A method for reducing ripple current in a circuit comprising:

• generating a first waveform at a terminal A;
• generating a second waveform at terminal B, the second waveform having an amplitude substantially the same as the first waveform and being out of phase with the first waveform;
• and
• filtering the first and second waveforms through a first and second inductive element, respectively, so that an alternating current component of the filtered waveforms output at terminals B and D is substantially eliminated.