Pulse width modulated defroster

Electric heating – Heating devices – Combined with diverse-type art device

Reexamination Certificate

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Details

C219S202000, C219S200000, C219S482000, C219S494000, C219S497000, C219S501000, C219S483000, C219S492000

Reexamination Certificate

active

07423240

ABSTRACT:
A window defroster system that includes a heater grid and a controller. The controller includes a pulse width modulator configured to provide a driving signal to the heater grid. The driving signal has an initial heating portion and a pulsed portion. The initial heating portion provides an initial voltage that is greater than an optimal operating voltage of the heater grid, the pulsed portion provides a pulsed signal with a pulsed high voltage that is greater than the optimal operating voltage.

REFERENCES:
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patent: 5496989 (1996-03-01), Bradford et al.
patent: 5624591 (1997-04-01), Di Trapani
patent: 5932128 (1999-08-01), Dishop
patent: 2 261 333 (1993-05-01), None
Andy Lindsay, What's a Microcontroller?, Student Guide, Version 2.1, Parallax Inc., pp. 1-232, Copyright 2003.
W. Hill, P. Horowitz, The Art of Electronics, Cambridge University Press, 1989, ISBN 0-521-37095-7.
Digi-Key Catalog No. T041, Jan.-Apr. 2004.

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