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Danger warning system with led

A technology for alarms and fire alarms, applied in the field of danger alarms, can solve the problems of no current, decrease in the number of alarms, etc.

Active Publication Date: 2008-11-05
NOVAR PLC
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In known alarms, this current consumption is acceptable, on the one hand because the LED is always operated with a current of several hundred milliamperes, on the other hand and mainly because the operational amplifier is only in a very short "connection" of about 30 ms. "on"-time, and no current during the next interval of about 970ms
And for the siren whose LED should nevertheless continue to light for the duration of the alarm state, this additional current consumption of the control circuit of the known siren is unacceptable, because its current consumption is thus in the alarm state. state will increase to about 1.5mA, resulting in a significant drop in the number of alarms available per signal line

Method used

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Embodiment Construction

[0016] The circuit according to FIG. 1 obtains at terminal A1 a positive supply or input voltage equal to, for example, a line voltage between 9 and 18V. Terminal A2 is grounded. A PNP switch transistor T1, an inductor L1, a low current LED and a current sensitive resistor R1 are connected in series between A1 and A2. A self-oscillating diode D1 is connected in parallel with the series circuit composed of L1 and LED.

[0017] An unillustrated microprocessor forming the signal processing circuit of the likewise unillustrated alarm also has PIN1 shown, which has an L (low) level of about 0V in a rest state or standby state and is in The alarm has an H (high) level of, for example, +3.3V in a test state or an alarm state. The collector of the NPN transistor T2 is connected to the PIN 1 through the resistor R2. The emitter of T2 is grounded. The base of T2 is connected to the junction between the LED and the current sensing resistor R1 via resistor R3. The collector of T2 is ...

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Abstract

The emergency alarm has a sensor that is sensitive to a physical variable and has a signal processing circuit. The alarm communicates with a center either wirelessly or by a two-core cable, and its supply voltage is obtained from the center or from an attached battery by the two-core cable. A control circuit is provided that consists of NPN-transistors (T2,T3) with the collector connected on one side with the output of the signal processing circuit over resistors (R1-R7). The other side delivers the clocked control signal for the semiconductor switch depending on the voltage.

Description

technical field [0001] The invention relates to a hazard indicator of the type stated in the preambles of claims 1 and 6 . Background technique [0002] A siren of this type is known from DE-A-10 2004 036 743 . In short, the signal processing circuit of the siren activates bright LEDs (Light Emitting Diodes) in the alarm state or in a test run triggered via the (control) center. Due to the limited supply power available, the LED will operate with a flash cycle of, for example, 1 Hz and a short "on" ("EIN")-time in the range of about 30 ms, and will also It is switched on and off in a rapid pulse sequence, for example with a pulse duration of 20 μs in each pulse period of 200 μs. However, there are such regulations in some countries that the red-emitting LED of the alarm itself must emit light continuously and with a brightness much higher than that of the basically known LEDs in fire alarms, for example, in the event of an alarm. The LEDs in the fire alarm are only used t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G08B5/22G08B5/36G08B13/00G08B17/00F21S9/02F21S10/06F21V23/00H05B37/02F21Y101/02
CPCG08B5/36G08B5/38H05B33/0818Y02B20/346Y02B20/30H05B45/3725
Inventor T·克里彭多夫H·波利策
Owner NOVAR PLC
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