Electric lamp and discharge devices: systems – Regulation of the control current and/or potential applied... – Plural load device systems
Patent
1978-08-25
1980-09-02
Moore, David K.
Electric lamp and discharge devices: systems
Regulation of the control current and/or potential applied...
Plural load device systems
315144, 315DIG7, 328 61, H05B 4138
Patent
active
042208955
ABSTRACT:
A network for the development of a square wave in a first time period as set by the timing occurrence of a first voltage to a predetermined threshold level and another network for the development of a square wave in a second time period as set by the timing occurrence of a second voltage to a predetermined threshold level. One square wave is chopped at a high frequency rate and the second square wave is chopped at the same high frequency rate, but by a chopping signal which is polarity inverted in phase from the first chopping signal. One of the chopped signals is polarity inverted before being combined with the other chopped signal to form a composite voltage. Separate lamp control networks can select between the two chopped signals to control dimming networks. The two chopped signals can overlap in time occurrence without interfering with the operation of each other.
REFERENCES:
patent: 3548342 (1970-12-01), Maxey
patent: 3816794 (1974-06-01), Snyder
patent: 3894265 (1975-07-01), Holmes et al.
Esquire, Inc.
Moore David K.
Vaden III Frank S.
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