Electricity: power supply or regulation systems – Output level responsive – Phase controlled switching using electronic tube or a three...
Patent
1991-04-17
1992-09-15
Voeltz, Emanuel T.
Electricity: power supply or regulation systems
Output level responsive
Phase controlled switching using electronic tube or a three...
323300, 323320, 315194, 315291, G05F 502
Patent
active
051480972
ABSTRACT:
An apparatus for stepless control of electric loads by the phase angle principle includes a semiconductor switch element. A trigger circuit is connected to the semiconductor switch element for furnishing turn-on pulses for triggering the semiconductor switch element. The trigger circuit includes at least one current flow detector, a turn-on pulse pregenerator circuit, a switch and driver unit, and a time-dependent circuit element. The on-state angle of each current half-wave is compared with a maximum allowable limit value of the on-state angle through the use of the current flow detector and the time-dependent circuit element, and a further triggering of the semiconductor switch element is prevented if the maximum allowable limit value of the on-state angle is exceeded. An apparatus for controlling the brightness of an incandescent bulb includes a transformer having a primary winding with two terminals and a secondary winding connected to an incandescent bulb. An alternating voltage source has one pole connected to one terminal of the primary winding. The semiconductor switch element has one main electrode connected to the other terminal of the primary winding and another main electrode connected to the other pole of the alternating voltage source.
REFERENCES:
patent: 4396869 (1983-08-01), Rosenbaum et al.
patent: 4688161 (1987-08-01), Covington
Publication 8136 Bauteile-Report Siemens (Siemens Component Report), vol. 15, No. 5 (1977.10); pp. 168-170, Kern & Strehle: "Elektronischer Helligkeitsregler mit Beruhrtaste" (Electronic Brightness Control w/Touch-Sensit.Key).
Publication Siemens AG, 1983, G. Moltgen "Stromrichtertechnik" (Current Converter Technology); pp. 64-69.
Greenberg Laurence A.
Lerner Herbert L.
Siemens Aktiengesellschaft
Voeltz Emanuel T.
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