Electricity: electrical systems and devices – Electrostatic capacitors – Fixed capacitor
Patent
1977-07-01
1980-02-05
Smith, Jr., David
Electricity: electrical systems and devices
Electrostatic capacitors
Fixed capacitor
H05R 104
Patent
active
041875281
ABSTRACT:
A unit is disclosed for individually controlling power to multiple loads, such as lights. The unit has multiple phase control channels, each having thyristor control of current to the load, triggered by a ramp-and-pedestal firing circuit employing a unijunction transistor with a capacitor at its emitter. The system has a circuit providing a pulse to all of the firing circuits to discharge the capacitor synchronous with the AC line. Another circuit generates a sinusoidal compensating signal for all of the firing circuits.
Each of the load channels has its own power control. In addition, a master control allows the power on all channels to be changed together, with the proportion of power in each channel set by its individual control.
The unit is housed in a box having a base sheet shaped to form front, bottom and rear walls, with side walls attached at opposite edges of the base sheet. A cover sheet forming the top wall of the box holds the controls of the unit, which are connected to a circuit board mounted to the underside of the cover sheet. Special mounting pieces allow attachment of the cover sheet to the base sheet. Without changing the structure, the cover sheet may be installed in either of two orientations to permit table top or wall mounted use of the unit.
REFERENCES:
patent: 3159436 (1964-12-01), Davis
patent: 3266656 (1966-08-01), Kridle
patent: 3271627 (1966-09-01), McDougal
patent: 3479568 (1969-11-01), Shapiro et al.
patent: 3482147 (1969-12-01), Kersten
patent: 3531076 (1970-09-01), Bang
patent: 3831063 (1974-08-01), Keough
patent: 3913997 (1975-10-01), Pull et al.
Hunt Electronics, Inc.
Smith Jr. David
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