Electricity: power supply or regulation systems – External or operator controlled – Phase controlled switching using electronic tube or a three...
Patent
1993-02-24
1994-02-01
Stephan, Steven L.
Electricity: power supply or regulation systems
External or operator controlled
Phase controlled switching using electronic tube or a three...
323241, 323242, 323326, G05F 140
Patent
active
052835162
ABSTRACT:
A low voltage dimmer is shown with the dimming function being on a primary side of a low voltage transformer. Live voltage feeds through a triac to the primary side of the transformer with the gate for the triac being controlled by a microprocessor. To prevent burnout of the transformer if the secondary load side is open, zero crossing of the incoming signal is determined by the microprocessor. If the time constant between the zero crossing of the live voltage and the charging of a capacitor with resistance being provided by the primary side of the transformer exceeds w predetermined time period, the microprocessor will be inhibited from generating a pulse to fire the triac. When the primary side of the transformer has been opened, the load on the secondary side can be re-established, i.e. light bulb replaced. Power for the microprocessor is from the charging of a capacitor used to provide the triggering signal to the microprocessor. Also the microprocessor may be triggered from remote locations.
REFERENCES:
patent: 4275445 (1981-06-01), Di Pietro Elizaran
patent: 4287468 (1981-09-01), Sherman
patent: 4466039 (1984-08-01), Moran et al.
patent: 4654806 (1987-03-01), Poyser et al.
patent: 4757797 (1988-07-01), Bengtsson
Han Y. Jessica
Pass & Seymour Legrand
Stephan Steven L.
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