Charge pump drive circuit for a light emitting diode

Miscellaneous active electrical nonlinear devices – circuits – and – External effect – Light

Reexamination Certificate

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C327S536000, C315S291000

Reexamination Certificate

active

11306408

ABSTRACT:
Through operated alternately between a charging phase and a discharging phase, a charge pump converts an input voltage source into a drive voltage for being supplied to a light emitting diode. A current setting unit determines a reference current. A current regulating unit has a current regulating terminal and a feedback detecting terminal. The current regulating terminal is coupled to the light emitting diode so as to control a current flowing through the light emitting diode to be proportional to the reference current. The feedback detecting terminal provides a feedback signal representative of a current regulation characteristic voltage. Based on a difference between the feedback signal and a reference voltage source, an error amplifier generates an error signal. A variable resistance unit is coupled between the input voltage source and the charge pump for adjusting a variable resistance in response to the error signal.

REFERENCES:
patent: 6091614 (2000-07-01), Malenfant
patent: 6107862 (2000-08-01), Mukainakano et al.
patent: 6400211 (2002-06-01), Yokomizo et al.
patent: 6411531 (2002-06-01), Nork et al.
patent: 6512411 (2003-01-01), Meng et al.
patent: 6538394 (2003-03-01), Volk et al.
patent: 6556067 (2003-04-01), Henry
patent: 6657875 (2003-12-01), Zeng et al.
patent: 6690146 (2004-02-01), Burgyan et al.
patent: 7116086 (2006-10-01), Burgyan et al.
“1A Low Noise High Current LED Charge Pump with Independent Torch/Flash Current Control”, Linear Technology, pp. 1-12, LTC3216, 2004.

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