| 摘要 |
The present invention is an improvement in battery powered smoke detectors. A smoke detector is powered by a series connection of two Li/SOCl2 cells having a capacity of about 2 amp hours. The smoke detector draws a quiescent current of about 7 mu A. A low voltage alarm activates when the battery voltage falls below about 6.0 volts upon the periodic application of about a 250 mu A to about a 1 mA battery test pulse. The cells are soldered directly into the smoke detector PC board and the smoke detector is placed in an unopenable case to deter battery removal. Smoke detector life expectancy including the battery is 15 years. This invention was made with Government support under grant number SOH (AHR-B) 1 R43 CE00014-01 awarded by the Centers for Disease Control (CDC), Center for Environmental Health and Injury Control (CEHIC), Division of Injury Control. The Government has certain rights in this invention.
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