Pulse width modulation circuit and illuminating device...

Details Pulse width modulation circuit and illuminating device... Pulse width modulation circuit and illuminating device...

2005-07-12

2005-07-12

Vo, Tuyet Thi (Department: 2821)

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Rectangular or pulse waveform width control

C327S172000, C327S118000

Reexamination Certificate

active

06917231

ABSTRACT:
In a pulse width modulation circuit, which generates an output whose pulse width is modulated by controlling a duty ratio of an oscillation circuit adapted to generate an oscillation at a frequency determined by a resistor and a capacitor to be electrically charged via the resistor, there is provided a resistance value varying means to vary a value of the resistor. The value of the resistor is varied by shorting the both ends of the resistor with a transistor, whereby the capacitor is charged in a reduced amount of time realizing a high-speed pulse width modulation circuit.

REFERENCES:
patent: 3949322 (1976-04-01), Morita
patent: 5612597 (1997-03-01), Wood
patent: 5925985 (1999-07-01), Zeng et al.
“Variable-Frequency, Variable Pulse-Width Generator,” Electronics World and Wireless World, Reed Business Publishing, Sutton, Surrey, GB, vol. 104, pp. 923, Nov. 1998.

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