Alarm systems and devices incorporating current limiting circuit

Details Alarm systems and devices incorporating current limiting circuit Alarm systems and devices incorporating current limiting circuit

1997-06-04

2000-04-11

Sherry, Michael J.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Impedance insertion

361110, 340653, H02H 900

Patent

active

060494468

ABSTRACT:
Electrical modules which incorporate multiple state input circuitry limit the in-rush current thereto when electrical energy is initially applied. The input circuitry exhibits a high impedance and subsequently a very low impedance state. When electrical energy is first applied, the high impedance state limits the in-rush current to an acceptable predetermined maximum value. Subsequently, in response to either elapsed time or an electrical parameter such as current flow, the circuit switches to a low impedance state which results in its having no material effect on the operation of the module. The module can incorporate a visual alarm indicating output device, an audible alarm indicating output device or both. The output indicating devices can be synchronized by applied control signals. The output devices can be controlled independently by means of either pulse width modulated control signals or by means of patterns of control pulses.

REFERENCES:
patent: 4860148 (1989-08-01), Iwamura et al.
patent: 4916432 (1990-04-01), Tice et al.
patent: 5179488 (1993-01-01), Rovner
patent: 5187653 (1993-02-01), Lorenz
patent: 5598139 (1997-01-01), Karim et al.
patent: 5793589 (1998-08-01), Friedl
patent: 5886431 (1999-03-01), Rutigliano

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