Patent ID: 7855515

Claim:
A high-voltage high-power constant current LED driver device, comprises switch tube, current sensing resistor Rcs and inductor L, the device further comprising: also comprises a low voltage control circuit that detects a voltage drop on the said current sensing resistor Rcs to produce a control signal transmitting to a control terminal of the switch tube; the a current sensing resistor Rcs connects with an inductor L in series and is positioned between the output terminal of the switch tube and a current output terminal of a current driving device in a series connection; an input terminal of the said switch tube is connected to a DC voltage source; a diode D 3 having a cathode connected to the output terminal of the said switch tube and a diode D 3 having a cathode is grounded; and the low voltage control circuit which detects the voltage drop on the current sensing resistor Rcs by using a comparator connected to the current sensing resistor Rcs; the low voltage control circuit output a control signal to the control terminal of the switch tube; the current sensing resistor Rcs connects with the inductor L in series and is positioned between the output terminal of the switch tube and the current output terminal of the current driving device in a series connection; the input terminal of the switch tube is connected to a DC voltage source.