LT5724B - Signal device operating from mechanical action - Google Patents

Abstract

The invention relates to signal devices, which operate from mechanical action. A device transforms parent impulses of physical processes, which are generated during operation of piezoelectric ignition device to electrical signals. The invention can be used in signal systems, security and monitoring systems, then is important quickness and independent doubling of signals.

Description

The invention relates to signaling devices which are actuated by mechanical action. The invention can be used in alarms, security and monitoring systems, where rapid operation and independent signal duplication are important.

There are known signaling devices whose sensors form a primary electrical impulse i.e. activates or deactivates the electrical alarm circuit by means of a button or horn. This impulse can be amplified, if necessary, and transformed into another type of emergency or utility signal, and further distributed to various channels, for example, the primary electrical impulse of a car alarm due to mechanical action is transformed into an audible and / or electromagnetic signal. alarm with a single primary electrical pulse is a prototype of the proposed device. Also, in most cases, power supplies are required for the operation of the sensors. There are known and patented, sophisticated, multifunctional alarm devices that have additional functions, such as controlling the condition of sensor power supplies over time (Patent CA 1115372).

Nowadays, network monitoring and security systems with a large number of different sensor nodes are increasingly used. They require low-energy sensors. There are also additional reliability and performance requirements for modern alarm systems and monitoring and security systems.

Such a sensor may be the piezo-electric ignition mechanisms PUM, which are designed to form an electrical discharge, for example, used to create a spark in a gas lighter (U.S. Pat. No. 6856074 and WO 03/074939). APC International Ltd manufactures various types of piezo electric ignition mechanisms and can manufacture such mechanisms to customer specified dimensions and mechanical trigger size. How PUM works: Mechanical compression activates the spring mechanism to impact the piezo element When triggered, a high voltage is generated between the output wire and the outer metal part, and an electric air breakout occurs (spark discharge). During impact, mechanical energy is transformed into other types of energy. Part of the mechanical energy is used to return the spring to its original state and the spark generation process can be repeated.

The purpose of the present invention is to improve the operational efficiency and reliability of alarms and alarm systems and at the same time to partially simplify their servicing.

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This objective is achieved by using the PUM signaling units as a non-power sensitive sensor with high throughput and the ability to duplicate the signal (with the main signaling channel interrupted).

The figures show the application of the PUM as a sensor in the alarm units. Fig. 1 shows a signaling device transforming primary acoustic and optical pulses generated by a PUM. FIG. Figure 2 shows an alarm device using primary electrical pulses. FIG. Figure 3 shows an alarm device using primary electromagnetic pulses.

a) An acoustic pulse is generated during the actuation of the PUM spring and during the electric puncture of the air. This variant is shown in Figs. 1. The PUM parts (1) and (2) move along each other, a metal beaker (3) is located at the bottom of the part (2), and a high-voltage insulated wire (4) is output from the part (2). The miniature microphone (6) converts the acoustic pulse into an electrical signal transmitted by wires (7). This case corresponds to known cases (prototypes) of signaling devices except for PUM application and is the slowest in terms of signal generation rate.

b) A spark (5) is generated during the electric shock of the air (see Fig. 1). In the discharge chamber (8), a spark (5) emits light. The optical pulse is collected by a converging lens (9) which is coupled to the optical fiber (10). The optical pulse is transmitted via an optical fiber to an optoelectronic converter (11), the electrical signal of which is then transmitted via a wire (7) or / and a cable (12). This case allows duplication of the signal received from the microphone (6). In addition, fiber-optic pulse transmission can have advantages over metal electric wires. This case is faster than case a.

The piezoelectric element of the proposed device also generates a series of short (10 to 100 nanosecond) electrical pulses of low voltage (relative to the generated high voltage causing a spark discharge) that occur within a microsecond interval of the high voltage pulse.

c) Instead of spark radiation, a high voltage electrical pulse can be obtained. This variant is shown in Fig.2. By applying a high impedance (5-20 kQ) (13) and a radio frequency transmission line (12), a voltage divider is created.

cl) By placing a matched suppressor (14) in the circuit, the low voltage pulse series is suppressed. The proposed device, after splitting, generates a signal from a high voltage pulse (its duration is about 1 ohm), which can be transmitted over the transmission lines (12) over a considerable distance up to the load (15). Usually its value is 50 or 75 Ω. At the rate of signal generation, this case is comparable to that of b.

c2) FIG. In the circuit diagram of Fig. 2, after removing the suppressor (14) with the key (16) and activating the voltage limiter (18) limiting the high voltage signal with the key (17), the proposed device generates a nanosecond pulse series signal after splitting.

d) The static fronts of the electrical pulses that are generated in nanoseconds cause the generation of short (also nanosecond) pulses and therefore broadband electromagnetic pulses

These pulses of electromagnetic radiation can be received using broadband antennas. This embodiment is provided in Fig.3. Upon actuation of the piezo-electric mechanism, the generated electromagnetic pulses are received by a broadband television frequency antenna (19) (see Fig. 3, a), and the pulses are transmitted by a cable (12) to a receiver-transmitter (20); this generates the required electrical signal and sends it to the monitoring station.

As the electromagnetic pulses generated by the proposed device are broadband, it is possible to use both higher frequency and smaller dimensions antennas (see Fig. 3, b). This is a miniature antenna (21) manufactured using a print technology. The signals it receives are of a smaller amplitude, leading to the introduction of a broadband amplifier (22). The pulses can then be fed to a receiver-transmitter (20) which generates the required electrical signal and sends it to the monitoring station. The advantage of this case is that the antenna is not attached to the piezo electric ignition mechanism by electrical wires or fiber optics. The operating speed depends on the speed of the receiver-transmitter in transforming an electromagnetic pulse.

The proposed alarm device provides for the possibility of duplication of the signal, for example, by simultaneously using the following signal reception cases: a + b, a + c, a + d, b + d, c + d.

Definition of the Invention

Claims (4)

Definition of the Invention A mechanical alarm system comprising a sensor and a device for transforming a sensor pulse into a signal having a piezo-electric ignition mechanism which functions as a sensor. 2. An alarm device according to claim 1, wherein the primary impulses are acoustic, optical and electromagnetic. 3. Alarm device according to claim 1, characterized in that the primary impulses are acoustic, high voltage and electromagnetic. Alarm device according to Claim 1, characterized in that the primary pulses from one effect are acoustic, a series of nanosecond pulses and electromagnetic.