Patent ID: 7688045

Claim:
A direct-current (DC) power conversion circuit with constant current output comprising: a DC voltage source for providing DC power; a driving circuit comprising: a switch having a first end coupled to the DC voltage source, a second end for receiving a control signal, and a third end, the switch used for conducting or cutting off a coupling between the first end and the third end according to the control signal received by the second end; a resistor having a first end coupled to the third end of the switch and a second end coupled to a first grounding end; a diode having a first end coupled to the third end of the switch and the first end of the resistor, and a second end coupled to a second grounding end; and an inductor having a first end coupled to the first grounding end, and a second end coupled to a load circuit; and a control signal generator having a first input end coupled to the second end of the switch, a second input end coupled to the first grounding end, and an output end coupled to the third end of the switch, the control signal generator for generating the control signal for the second end of the switch according to a current of the resistor.