Sinusoidal inductorless dimmer providing an amplitude attenuated

Details Sinusoidal inductorless dimmer providing an amplitude attenuated Sinusoidal inductorless dimmer providing an amplitude attenuated

1992-11-19

1994-11-15

Pascal, Robert J.

Electric lamp and discharge devices: systems

Regulation of the control current and/or potential applied...

315DIG4, 315307, 315209R, 323242, G05F 100

Patent

active

053651480

ABSTRACT:
A dimmer control circuit for application to a load bank produces a sinusoidal power wave form exhibiting the desirable characteristic of suitable rise and fall times producing little or no audible or radio frequency interference. A pair of MOS-FET power devices operate in a linear mode and attenuate respective half-cycles of a single phase power line as a function of a dimmer control signal applied thereto. The device includes a mechanism for avoiding damage to the power MOS-FET by controlling conditions under which a signal change is applied to the gates of the MOSFETs, and by imbalanced attenuation between the MOS-FETs through the range of the dimmer control signal.

REFERENCES:
patent: 4617508 (1986-10-01), Bloomer
patent: 4633161 (1986-12-01), Callahan et al.
patent: 4788474 (1988-11-01), Kokubu et al.
patent: 5045774 (1991-09-01), Bromberg

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