Miscellaneous active electrical nonlinear devices – circuits – and – External effect – Light
Reexamination Certificate
2007-09-18
2007-09-18
Wells, Kenneth B. (Department: 2816)
Miscellaneous active electrical nonlinear devices, circuits, and
External effect
Light
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.
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“1A Low Noise High Current LED Charge Pump with Independent Torch/Flash Current Control”, Linear Technology, pp. 1-12, LTC3216, 2004.
Chen Tien-Tzu
Tsen Chia-Hung
Aimtron Technology Corp.
Wells Kenneth B.
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