Battery saving circuit for a dangerous condition warning device

Details Battery saving circuit for a dangerous condition warning device Battery saving circuit for a dangerous condition warning device

1998-02-18

1999-10-12

Hofsass, Jeffery A.

Communications: electrical

Condition responsive indicating system

Specific condition

340628, 340632, 34082544, 455 383, 455343, G08B 2100

Patent

active

059660783

ABSTRACT:
In a processor controlled, battery operated dangerous condition warning device employing a DC-to-DC converter, the converter selectively operates at two voltage outputs. A first output voltage is used when a sensor is polled and when audio visual devices, such as LEDs and a horn, are driven; i.e., when higher power is momentarily required; at all other times, a second, lower voltage output, sufficient for ongoing operation of the processor as it keeps time and processes information, is issued by the converter. In a presently preferred embodiment, when the processor determines that the higher voltage is momentarily required, it sends a first signal to a transistor switch to change the voltage at a reference input to the converter which responds by issuing the higher voltage. When the higher voltage is no longer needed, the processor sends a second signal to change the state of the transistor switch such that the converter reverts to the lower output voltage, thus decreasing the load on the battery.

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