Electricity: power supply or regulation systems – External or operator controlled – Phase controlled switching using electronic tube or a three...
Patent
1978-08-28
1981-09-01
Shoop, William M.
Electricity: power supply or regulation systems
External or operator controlled
Phase controlled switching using electronic tube or a three...
323319, 315293, 315DIG4, H05B 3702
Patent
active
042874688
ABSTRACT:
There is disclosed herein a method and apparatus for controlling the power dissipation in a load particularly suitable for use as a dimmer control for lighting circuits. Selected half cycles are applied to a load, such as an incandescent lamp. The number and sequence of the half cycles applied to the load are selected by logic circuitry which, according to the setting of a dimmer control, determines how many complete half cycles out of the total available to apply to the load. Zero crossing switching is used.
REFERENCES:
patent: 3684919 (1972-08-01), Cramer
patent: 3706914 (1972-12-01), Van Buren
patent: 3766431 (1973-10-01), Isaacs
patent: 3878358 (1975-04-01), Barton et al.
patent: 4039897 (1977-08-01), Dragoset
patent: 4095139 (1978-06-01), Symonds et al.
Burt Harris, "Zero Voltage Switching Power Control Circuit", Electronic Engineering Times, Dec. 12, 1977, p. 44.
W. Check et al., "Microcontroller Includes A-D Converter for Lowest-Cost Analog Interfacing", Electronics/May 25, 1978, pp. 122-127.
W. F. Ittner et al., "Microcomputer's On-Chip Functions Ease Users' Programming Chores", Electronics/Jul. 20, 1978, pp. 129-133.
John L. Hilburn et al., "Microcomputers/Microprocessors: Hardware, Software, and Applications", Prentice-Hall, Inc., 1976, pp. 105-108.
Shoop William M.
Wong Peter S.
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