Battery-powered alarm

In the present invention, a power supply route to the heater resistor (2b) of a gas sensor (2) is configured from the two routes that are: a route supplying power from a boost circuit (12) via a switch (SW1); and a route supplying power from a battery (1) via a switch (SW4). A control circuit (11) c...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser:	NAKAYAMA, TOSHIRO, OHNISHI, HISAO, NAKAJIMA, TAKASHI, NONAKA, ATSUSHI, KAMIOKA, TSUYOSHI, WATANABE, TADASHI, DANGI, YASUHARU, SASAKI, SHOJI
Format:	Patent
Sprache:	chi ; eng
Schlagworte:	ALARM SYSTEMS MEASURING MEASURING ELECTRIC VARIABLES MEASURING MAGNETIC VARIABLES ORDER TELEGRAPHS PHYSICS SIGNALLING SIGNALLING OR CALLING SYSTEMS TESTING
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Beschreibung
Zusammenfassung:	In the present invention, a power supply route to the heater resistor (2b) of a gas sensor (2) is configured from the two routes that are: a route supplying power from a boost circuit (12) via a switch (SW1); and a route supplying power from a battery (1) via a switch (SW4). A control circuit (11) controls switch (SW4) ON while the battery (1) voltage is normal, applying the battery voltage of the battery (1) to the heater resistor (2b), and when the battery (1) voltage has decreased at the end of the battery use life below a predetermined threshold, controls switch (SW1) ON, applying the boosted voltage of the boost circuit (12) to the heater resistor (2b).