The present invention is based on a regulation circuit for making available a constant current supply on the basis of a transformer principle, in which there flows through the luminescent diodes (D1, . . . , DN) a triangular a.c. current varying periodically around a DC current value. Both a charging...http://www.google.es/patents/US7708447?utm_source=gb-gplus-sharePatente US7708447 - Current supply for luminescent diodes
