Patent ID: 7196483

Claim:
An electrical circuit for use with a light source, the light source having at least a first current path, a second current path, one or more first light-emitting devices connected to the first current path for receiving a first current from the electrical circuit, and one or more second light-emitting devices connected to the second current path for receiving a second current from the electrical circuit, wherein a ratio of the second current to the first current is R, said electrical circuit comprising: an inverter driver section to provide electrical power; a rectifying section having a first rectifier and a second rectifier; and a balanced transformer section disposed between the inverter driver section and the rectifying section, the balanced transformer section comprising: a first transformer operatively connected between the inverter driver section and the first rectifier, the first transformer having a current providing coil for providing the first current, the current providing coil having a number of coil turns, and an induction coil magnetically coupled to the current providing coil for producing an induction current in response to the first current, the induction coil having a further number of coil turns with a first coil turn ratio between the number and the further number; a second transformer operatively connected between the inverter driver section and the second rectifier, the second transformer having a current providing coil for providing the second current, the current providing coil having a number of coil turns, and an induction coil magnetically coupled to the current providing coil for producing an induction current in response to the second current, the induction coil having a further number of coil turns with a second coil turn ratio between the number and the further number, wherein the induction coil of the first transformer and the induction coil of the second transformer are connected to form a current loop for the induction current in the first and second transformers, and wherein a ratio between the first coil turn ratio and the second coil turn ratio is substantially equal to R.