Bi-level control system for lighting and other applications

Details Bi-level control system for lighting and other applications Bi-level control system for lighting and other applications

1996-12-24

1998-09-22

Lee, Benny

Electric lamp and discharge devices: systems

Plural load device systems

Electric switch in the supply circuit

315360, 315362, 307113, 307139, H05B 3700

Patent

active

058119396

ABSTRACT:
A circuit and method for switching an output terminal from a first voltage level to a second voltage level through a buffered transition includes two voltage sources, a resistor and first switch connected in series and electrically coupled between the first voltage source and the output terminal for providing a suitable resistance for buffering a transition from a first voltage level to a second voltage level. A second switch is electrically coupled between the first voltage and the output terminal. A third switch is electrically coupled between the second voltage source and the output terminal. A programmable logic controller (PLC) controls the three switches in a predetermined sequence to allow switching a voltage source from the first source to the second source through a buffered transition provided by the resistor.

REFERENCES:
patent: 4931701 (1990-06-01), Carl
patent: 5212478 (1993-05-01), Moseley
patent: 5221877 (1993-06-01), Falk
patent: 5309068 (1994-05-01), Hakkarainen et al.
patent: 5327048 (1994-07-01), Troy
patent: 5357170 (1994-10-01), Luchaco et al.
patent: 5450302 (1995-09-01), Maase et al.
patent: 5610448 (1997-03-01), Dattilo
patent: 5633540 (1997-05-01), Moan

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