Patent ID: 7358684

Claim:
A method to balance current flows in a light source operatively connected to an electrical circuit providing electrical power to the 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, and one or more second light-emitting devices connected to the second current path, the first current path operatively connected to a first power source through a first rectifying means for receiving a first current, the second current path operatively connected to a second power source through a second rectifying means for receiving a second current, wherein a ratio of the second current to the first current is R, and wherein the electrical circuit comprises: a first transformer operatively connected between the first power source and the first rectifying means, 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 second power source and the second rectifying means, 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, said method comprising the steps of: connecting the induction coil of the first transformer and the induction coil of the second transformer to form a current loop for the induction current in the first and second transformers; selecting the first and second coil turn ratios such that the ratio between the first coil turn ratio and the second coil turn ratio is substantially equal to R.