US4516214 Nov 12, 1982 May 7, 1985 At&T Bell Laboratories Power failure alarm circuit permitting orderly shutdown of microprocessor loadUS4516214 1982年11月12日 1985年5月7日 At&T Bell Laboratories Power failure alarm circuit permitting orderly shutdown of microprocessor load...
Power failure alarm circuit permitting orderly shu 优质文献 相似文献 参考文献 引证文献Microprocessor-Controlled Digital Shunt Regulator A new approach to the design of power systems is presented in which a microprocessor is used as a controller for a digital shunt regulator (DSR). This appr... ...
This minuscule power failure alarm circuit is a power supply monitoring device that will set off a piezo-speaker when the ac mains mains supply cuts off. It is very helpful to indicate the loss of power supply to some power-critical instruments such as a lifecare device installed in a hospi...
Here is a simple mains power failure alarm/detector circuit that produces an alarm whenever the mains supply fails. Lot of such circuits are available, but the peculiarity of this circuit is that it requires no back up power source like a battery to power the alarm when the mains is absent...
Following are the two circuit diagrams that explain the relay operation. The first diagram demonstrates the red contact is normally open under a normal operating condition, meaning that the 12-48VDC Power Supply constantly delivers power to the switch wi
An alarm device for connection between an electric appliance and a power source to provide an audible and visual signal of a power failure. The device includes a first circuit in series with the appliance and power source containing an electro-magnet holding a spirally wound spring hammer in sp...
Power-off alarm circuit 专利名称：Power-off alarm circuit 申请号：JP14443486 申请日：19860919 公开号：JPS6349616U 公开日：19880404 专利内容由知识产权出版社提供更多信息请下载全文后查看
Study on Alternating Current Power Failure Detection Method and Alarm Circuit In this paper,an alternating current power failure detection method is introduced by detecting alternating current phase to determine whether the power is ... LI Jian-Wei - 《Telecom Power Technology》 被引量: 0发表: 201...
This power failure alarm project is a power supply monitoring device that will trigger a buzzer when the mains supply cuts off. At the same time, the light emitting diode will be turned ON. This device is helpful to inform the loss of power supply to some critical installation such as a ...
terminals, the power supply circuit for the alarm unit is shut off and when the power is not supplied to one of them, the power supply circuit is closed. CONSTITUTION:Alarm units such as buzzer 13, indication lamp 14, etc. connected to the power supply circuit of power failure alarm unit...