Luminous indicator with zero standby power

Details Luminous indicator with zero standby power Luminous indicator with zero standby power

1975-11-14

1977-04-12

Curtis, Marshall M.

Communications: electrical

Systems

With specific power supply

315131, 340324R, G09F 932

Patent

active

040178471

ABSTRACT:
In a luminous indicator circuit, a plurality of luminous elements are connected in series relation to form a series circuit which is supplied through a constant current device. A solid state switching device is placed in parallel with each luminous element (e.g., LED). A control circuit including switches connected to a D.C. source determines the conduction of each solid state switch, so that the associated luminous element is controlled independently of the other luminous elements in the series circuit. The control circuit includes switching means which supplies voltage to the indicator circuit only when at least one luminous element is activated. Circuit protection against unwanted transient voltages is provided.

REFERENCES:
patent: 2345135 (1944-03-01), Lippman
patent: 3789362 (1974-01-01), Prolss et al.
patent: 3872463 (1975-03-01), Lapeyre

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