专利快速检索-快速检索全球专利，免费商用专利数据库-IPRDB

1. 发明申请

WO9317482A3 POWER SUPPLY AND SMOKE SENSOR FOR ALARM SYSTEM 审中-公开
标题翻译：用于报警系统的电源和烟雾传感器
公开(公告)号：WO9317482A3
公开(公告)日：1993-10-28
申请号：PCT/GB9300409
申请日：1993-02-26
申请人： SCANTRONIC LTD
发明人： MOORE ROBERT WILLIAM
IPC分类号： H02J13/00 , G08B17/10
CPC分类号： H02J13/0048 , Y02E60/783 , Y04S40/123
摘要： An alarm is provided in association with a ceiling rose. In order to provide the alarm with substantially continuous power while still allowing the light to be switched on/off the normal power supply lines are used together with a special light switch. Operation of the light switch produces a modification in the waveform of the AC power supplied to the ceiling rose. This modification is detected by a sensing circuit at the ceiling rose. The sensing unit controls the switching of the light. Preferably the AC power waveform is modified by creating an imbalance between the positive and negative half-cycles of the waveform. This imbalance may be compensated using a balancing circuit at the ceiling rose. By altering the polarity of the imbalance created in the AC waveform it is possible to signal to the sensing circuit that a further switchable unit, e.g. a ceiling fan, connected to the sensing circuit should be switched. If the alarm is a smoke alarm or the like then it is preferred to promote circulation of air within the casing of the unit, as well as to improve the draw of air into the casing, using a heating means and a special arrangement of air flow passages.

IPRDB

热门服务

关于我们

友情链接

联系方式