Patent ID: 7511462

Claim:
A direct-current (DC) power conversion circuit having self-auxiliary power and self-protection against a short or open load circuit comprising: a DC voltage source coupled to a grounding end, for providing a 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 an electrical connection between the first end and the third end according to the control signal received by the second end; a first resistor having a first end coupled to the third end of the switch and a second end; a control signal generator coupled to the first end of the first resistor and the second end of the first resistor, for sensing voltage of the first resistor, so as to generate the control signal; a second resistor having a first end coupled to the DC voltage source and the first end of the switch, and a second end coupled to the control signal generator; a diode having a first end coupled to the second end of the first resistor, and a second end coupled to the grounding end; and an inductor having a first end coupled to the second end of the first resistor, and a second end coupled to a load circuit; and an auxiliary circuit parallel to the inductor, the auxiliary circuit comprising: an auxiliary capacitor having a first end coupled to the second end of the first resistor, and a second end coupled to the second end of the second resistor; and an auxiliary diode having a first end coupled to the second end of the auxiliary capacitor, and a second end coupled to the second end of the inductor.