Patent ID: 6147457
Filing Date: 2000-11-14
Classification: H01K,H05B

Abstract:
An incandescent lamp, comprising:a base for connection into a lamp socket, said base comprising a pair of base terminals for receiving an AC supply voltage with frequency f,voltage conversion means comprising:rectifying means having:input terminals coupled to said pair of base terminals andoutput terminals,capacitive means coupled to the output terminals and equipped with a first series arrangement comprising two capacitors,switching means coupled to the first series arrangement for generating a first high frequency voltage out of the voltage present over the first series arrangement, andtransformer means, coupled to the switching means and comprising a primary winding and a secondary winding, for transforming the first high frequency voltage into a second high frequency voltage,low voltage incandescent burner means coupled to the secondary winding, andenvelope means, comprising at least one translucent part, said envelope means being fastened to the base and together with the base enclosing the voltage conversion means and the low voltage incandescent burner means,characterized in thatthe voltage conversion means further comprises a control circuit comprising an integrated circuit for generating a control signal for rendering the switching means alternately conducting and non-conducting substantially independent of the frequency f of the AC supply voltage.