Auxiliary backup device of burglary alarm system

• US 5,654,691 A
• Filed: 05/12/1995
• Issued: 08/05/1997
• Est. Priority Date: 05/12/1995
• Status: Expired due to Fees

• Current Assignee: Wang, Randall
• Original Assignee: Wang, Randall
• Inventors: Wang, Randall
• Primary Examiner(s): Mullen, Thomas
• Assistant Examiner(s): Pope, Daryl C.
• Application Number:
  US08/439,851
• Time in Patent Office: 816 Days
• Field of Search: 340/506, 340/507, 340/514, 340/521, 340/524, 340/292, 340/693, 340/333, 364/184, 364/187
• US Class Current: 340/507
• CPC Class Codes: G08B 29/10 Monitoring of the annunciator circuits

Abstract

The present invention provides an auxiliary backup device of burglary alarm system, connected with an alarm output and an auxiliary power output of a burglary control panel and an alarm device, comprises in combination an electrical circuit having a relay means and a DC power source. The relay means comprises a diode connected in parallel with an operating coil which induces a normally opened switch and also a normally closed switch. The two terminals of the diode are connected to the auxiliary power output of the control panel. The normally opened switch is coupled in series with the alarm output of the control panel and the input of the alarm device, such as an audible and visual warning devices. The output of the DC power source is connected in series with the normally closed switch and the input of the alarm device. Accordingly, when the control panel works normally that the voltage of the auxiliary power output of the control panel is high, the normally opened switch is induced to close and the normally closed switch is induced to open. Thus, the alarm output of the control panel is connected directly to the input of the alarm device. If the control panel and wiring are vandalized, the auxiliary power output losses its voltage or power. Then, the normally opened switch open and the normally closed switch close. At that time, the DC power source energizes the alarm device.

Claims

1. An auxiliary backup device of burglary alarm system, which is connected to an alarm output and an auxiliary power output of a burglary control panel and an alarm device, comprising in combination an electrical circuit having a relay means, a DC power source, a power input, an alarm input, and an alarm output;

wherein

said power input connecting to said auxiliary power output of said control panel, said alarm input connecting to said alarm output of said control panel, said alarm output connecting to said alarm device;

said relay means comprising an operating coil, said operating coil inducing a normally opened switch and a normally closed switch;

in which said operating coil having two terminals connected to said power input, said normally opened switch connecting in series with said alarm input and alarm output which are connected to said alarm output of said control panel and said alarm device respectively; and

said DC power source having an power output connected in series with said normally closed switch and said alarm output;

so that when said control panel works normally that the voltage of said auxiliary power output of said control panel is high, said normally opened switch is induced to close and said normally closed switch is induced to open;

said alarm output of said control panel being connected directly to said input of said alarm device, and that when the power supply of said power input is interrupted, said normally opened switch is opened and said normally closed switch is closed, in which said DC power source energizes said alarm device, wherein said DC power source comprises two 9 V batteries and a power controlling switch device which comprises two high-normal switches, said first and second high-normal switches each having a normal terminal and a high terminal, said first battery having a positive pole connected to said electric wire and said normal terminal of said first switch, said first battery having a negative pole connected to said second switch, said second battery having a position pole connected to said normal terminal of said second switch which is connected to said normally closed switch, said second battery having a negative pole connected to said first switch, said high terminal of said first switch being connected to said high terminal of said second switch, therefore, in normal situation, said two batteries having no supply power, and said alarm device being energized by said control panel, so that when said power input is interrupted, said two batteries are connected to said alarm output and supplies voltage power to said alarm device, and that when said high-normal switches are switched to normal terminals, said two batteries are connected in parallel and their voltage output being in normal stage that said two batteries last longer, and that when said two high-normal switches are switched to high terminals, said two batteries are connected in series and their voltage output being in higher strength that said batteries discharge more quickly.

2. An auxiliary backup device of burglary alarm system, which is connected to an alarm output and an auxiliary power output of a burglary control panel and an alarm device, comprising in combination an electrical circuit having a relay means, a DC power source, a power input, an alarm input, and an alarm output;

wherein

said power input connecting to said auxiliary power output of said control panel, said alarm input connecting to said alarm output of said control panel, said alarm output connecting to said alarm device;

said relay means comprising an operating coil, said operating coil inducing a normally opened switch and a normally closed switch;

in which said operating coil having two terminals connected to said power input, said normally opened switch connecting in series with said alarm input and alarm output which are connected to said alarm output of said control panel and said alarm device respectively, said relay means further comprising a diode connected in parallel with said operating coil, said normally opened switch having a normally opened terminal and a common terminal, said normally closed switch being composed of said common terminal and a normally closed terminal, said alarm input having a negative terminal and said alarm output having a negative terminal connected with each other by an electric wire, said alarm input having a positive terminal connected to said normally opened terminal by a connecting wire, said alarm output having a positive terminal connected to said common terminal by a common wire, said DC power source having an output connected to said normally closed terminal and an input connected with said electric wire; and

said DC power source having an power output connected in series with said normally closed switch and said alarm output;

so that when said control panel works normally that the voltage of said auxiliary power output of said control panel is high, said normally opened switch is induced to close and said normally closed switch is induced to open;

said alarm output of said control panel being connected directly to said input of said alarm device, and that when the power supply of said power input is interrupted, said normally opened switch is opened and said normally closed switch is closed, in which said DC power source energizes said alarm device, and that said DC power source comprises two 9 V batteries and a power controlling switch device which comprises two high-normal switches, said first and second high-normal switches each having a normal terminal and a high terminal, said first battery having a positive pole connected to said electric wire and said normal terminal of said first switch, said first battery having a negative pole connected to said second switch, said second battery having a position pole connected to said normal terminal of said second switch which is connected to said normally closed switch, said second battery having a negative pole connected to said first switch, said high terminal of said first switch being connected to said high terminal of said second switch, therefore, in normal situation, said two batteries having no supply power, and said alarm device being energized by said control panel, so that when said power input is interrupted, said two batteries are connected to said alarm output and supplies voltage power to said alarm device, wherein when said high-normal switches are switched to normal terminals, said two batteries are connected in parallel and their voltage output being in normal stage that said two batteries last longer, and that when said two high-normal switches are switched to high terminals, said two batteries are connected in series and their voltage output being in higher strength that said batteries discharge more quickly.

3. An auxiliary backup device as recited in claim 2, further comprising a jumper circuit which is connected between said power input and said relay means, said jumper circuit comprising a jumper diode and a resistor connected in serial, a capacitor connected in parallel with said power input, thus adapting for 24 V DC or AC power supply.

4. An auxiliary backup device as recited in claim 3, wherein said jumper circuit further comprises a jumper circuit wire connected in parallel with said jumper diode and said resistor for adapting 12 V DC power supply, and when the input power from said control panel is 24 V DC or AC, cut said jumper circuit wire for installation.

5. An auxiliary backup device as recited in claim 4, further comprising a normally closed test switch which is connected between said power output and said relay means for testing said auxiliary backup device'"'"'s operation and said batteries'"'"' strength.

6. An auxiliary backup device as recited in claim 5, in which said auxiliary backup device is disposed in a standard electrical one-gung box.

7. An auxiliary backup device as recited in claim 6, in which said test switch is mounted on said control panel.