Patent ID: 6011465
Filing Date: 2000-01-04
Classification: G08B

Abstract:
A backup arrangement for an alarm system, which is connected between an alarm output and an auxiliary power output of a control panel of said alarm system and a system warning device of said alarm system, said backup arrangement comprising in combination an electrical circuitry having an electronic switch circuit, a DC power source, a build-in electronic Hi-sounder, and a chargeable resistor;said electronic switch circuit, which is an IC control system, having a power input connected to said auxiliary power output of said control panel and an alarm input connected to said alarm output of said control panel, said electronic switch circuit defining a normally opened switch and a normally closed switch, wherein said normally closed switch is coupled in series with said alarm output of said control panel and an input of said build-in electronic Hi-sounder;said DC power source comprising at least a DC battery which output is coupled in series with said normally opened switch of said electronic switch circuit and said input of said build-in electronic Hi-sounder;said chargeable resistor being connected between said DC power source and said power input for charging said DC power source when said backup arrangement is not in use and preventing current leakage of said DC power source so as to prolong a service span life of said DC power source; andsaid backup arrangement further comprising an alert output connected to an input of said system warning device of said alarm system, wherein when said control panel works normally, a voltage of said auxiliary power output of said control panel is high, said normally closed switch is in a close condition and said normally opened switch is in an open condition, and that said alarm output of said control panel is connected directly to said input of said system warning device via said alert output, wherein when either said control panel is vandalized that said auxiliary power output losses voltage or power thereof, or said system warning device is damaged, said normally closed switch is switched by said electronic switch circuit to an open condition and said normally opened switch is switched by said electronic switch circuit to a close condition, in order to connect said DC power source with said build-in electronic Hi-sounder to energize said build-in electronic Hi-sounder to provide Hi-pitch warning alarm.