Miscellaneous active electrical nonlinear devices – circuits – and – Signal converting – shaping – or generating – Rectangular or pulse waveform width control
Reexamination Certificate
2006-01-24
2006-01-24
Lam, Tuan T. (Department: 2816)
Miscellaneous active electrical nonlinear devices, circuits, and
Signal converting, shaping, or generating
Rectangular or pulse waveform width control
C327S109000, C327S515000
Reexamination Certificate
active
06989701
ABSTRACT:
A PWM driving apparatus for an LED includes a sawtooth wave generator (1) for generating a sawtooth wave signal, a comparator (2), an FET (3), a first resistor (4), a second resistor (5), a power supply (7), and a light emitting diode array (8). A modulation signal provided by a modulation signal source (6) and the sawtooth wave signal are fed to the comparator, an output of the comparator is connected to a gate terminal of the FET, the power supply is connected to a source terminal of the FET through the first resistor, and a drain tenninal of the FET outputs a driving current through the second resistor to the light emitting diode array.
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Lee Ching Yen
Lin Jyh Chain
Chung Wei Te
Hon Hai - Precision Ind. Co., Ltd.
Lam Tuan T.
Nguyen Hai L.
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