초록 ▼

A vehicle security siren that includes a rechargeable back-up battery and an electronic circuit that minimizes current drain from the vehicle\s battery by controlling the rate at which the siren\s back-up battery is charged by the vehicle\s battery. The circuit charges the siren\s battery at a relat

A vehicle security siren that includes a rechargeable back-up battery and an electronic circuit that minimizes current drain from the vehicle\s battery by controlling the rate at which the siren\s back-up battery is charged by the vehicle\s battery. The circuit charges the siren\s battery at a relatively high rate when the vehicle engine is running or the ignition is on, and by a low charging rate at other times. This multi-level charging rate preserves the vehicle\s battery charge particularly if the vehicle is not driven for any extended time period. The circuit includes a back-up battery condition detector that issues a warning signal in the event of failure of the back-up battery. The circuit also limits the maximum siren duration in the event that either the vehicle\s battery or the security system is disconnected from the siren.

대표청구항 ▼

A vehicle security system siren apparatus with a backup rechargeable battery, for installation in a vehicle having an electrical system with a vehicle battery, comprising: a siren transducer for converting electrical signals into acoustic energy in response to security system trigger signals; means

A vehicle security system siren apparatus with a backup rechargeable battery, for installation in a vehicle having an electrical system with a vehicle battery, comprising: a siren transducer for converting electrical signals into acoustic energy in response to security system trigger signals; means for connecting said siren apparatus to said vehicle electrical system to provide electrical power to said apparatus; a backup rechargeable battery for providing power to said apparatus and enable operation of said transducer in the event electrical power is not available from said vehicle security system; and means for charging said backup battery from said vehicle electrical system without unduly draining the vehicle battery, comprising means for charging said backup battery at a relatively high charging rate only while the vehicle is being operated, and means for charging said backup battery at a low charging rate when the vehicle is not being operated, thereby avoiding rapid discharge of the vehicle battery during intervals in which the vehicle is not being operated.