Patent ID: 7825607

Claim:
A d-c to d-c converter circuit (DDCC) that operates in combination with a vehicle battery circuit ( 50 ) that produces a d-c input voltage ( 11 ), a vehicle LED circuit ( 52 ) and a vehicle electrical wiring cable ( 54 ), said DDCC comprising: a) an input circuit ( 12 ) having means for receiving the input d-c voltage ( 11 ) and means for producing a filtered, current limited d-c power signal ( 13 ), b) a voltage regulating circuit ( 14 ) comprising: (1) a transistor (Q 1 ) having a collector (C) connected to the current limited d-c power signal ( 13 ), a base (B) and an emitter (E), (2) an integrated voltage regulator (VR) having a first input (I 1 ) that is applied the filtered, current limited d-c power signal ( 13 ), a second input (I 2 ), a third input (I 3 ) and an output (O) that produces a regulated square wave signal ( 15 ), c) a comparator circuit ( 16 ) having means for receiving a clamped d-c reference voltage ( 25 ), a d-c reference voltage ( 27 ) and producing a d-c reference voltage ( 19 ) that is applied to the second input (I 2 ) of the integrated voltage regulator (VR), d) an oscillator circuit ( 18 ) having means for receiving the filtered, current limited power signal ( 13 ) and means for producing a chopped square wave signal ( 21 ) that is applied to the third input (I 3 ) of the integrated voltage regulator (VR) which causes the voltage regulator (VR) to apply the regulated square wave signal ( 15 ) to the base (B) of the transistor (Q 1 ) which enables the transistor, e) an output and feedback circuit ( 26 ) having means for producing: (1) the d-c reference voltage ( 27 ) that is applied to the third input (I 3 ) of the comparator circuit ( 16 ), and (2) an output d-c voltage ( 23 ) that is applied to and enables the vehicle LED circuit ( 52 ).