RU196069U1 - LIGHT ALERT - Google Patents

Abstract

The utility model relates to the field of electrical engineering, namely information signaling systems located in open spaces, on vehicles, as well as in buildings and structures, and can be used to alert the public in case of emergency. The proposed light siren contains a sealed enclosure, an LED matrix, a control circuit, a control unit based on a microcontroller, and input contacts for connecting a network power source. The control circuit is connected in the siren after the LED matrix, in front of which the switching circuit and the current stabilization circuit go sequentially from the input contacts. The utility model allows to increase the reliability of monitoring the operation of the light siren. 3 ill.

Description

The utility model relates to the field of electrical engineering, namely, information signaling systems located in open spaces, on vehicles, and also in buildings and structures, and can be used to alert the public in case of emergency.

The use of light sirens in warning systems is necessary in cases where it is not possible to provide a large territory with sound or voice alerts, in cases where the protected area or object has an increased noise level, which does not allow the efficient use of sound or voice sirens. It is also necessary to use light sirens at objects with a permanent stay of people with hearing impairments and in places where people work in noiseproof equipment. Fire safety requirements for various types of sirens and fire safety requirements for equipping buildings (structures) with various types of warning and evacuation systems (SOUE) in case of fire are set out in Article 84 of Federal Law No. 123 of May 1, 2009 “Technical Regulations on Fire Safety Requirements " Here are some of them:

“Alerting people about a fire, managing the evacuation of people and ensuring their safe evacuation in case of fire in buildings, structures and structures should be carried out using one of the following methods or a combination of the following methods:

- supply of light, sound and (or) speech signals to all rooms with a permanent or temporary stay of people;

- in protected rooms where people are in noise-proof equipment, as well as in protected rooms with a sound sound level of more than 95 dBA, sound sirens should be combined with light sirens. The use of flashing light annunciators is permitted. ”

In buildings with a permanent presence of people with hearing and visual impairments, flashing light sirens or specialized sirens should be used (including specialized warning systems that provide sound signals of a certain frequency and light pulse signals of increased brightness, as well as other technical means of individual warning) .

As for fire control devices for controlling warning devices, for them GOST R 53325-2009 “FIRE TECHNOLOGY. EQUIPMENT FOR FIRE AUTOMATION. General technical requirements. Test methods. " defines the following basic and most important technical requirements:

a) automatic activation of actuators of public address systems;

b) automatic control of the integrity of communication lines with actuators of fire protection systems and technical means that record the operation of fire protection, with the issuance of information about the violation of the integrity of the controlled circuits by means of a light indication and an audible alarm. According to paragraph 6.2.1.7 of this GOST, fire alarms must provide a contrasting perception of information when it is illuminated in the range of values from 1 to 500 lux. A flashing light fire alarm must have a flashing frequency in the range from 0.5 to 5.0 Hz.

Various light annunciators are known from the prior art (see patent RU172160, class G09F 13/00, publ. 06/29/2017; patent RU103649, class G08B 25/00, publ. 04/20/2011, patent RU136212, class G08B 25 / 00, publ. 12/27/2013). The closest in technical essence to the proposed utility model is a light siren containing a sealed housing, an LED matrix, a control circuit, a control unit based on a microcontroller and input contacts for connecting a mains power supply (see patent RU189609, class G08B 25/10, publ. May 29, 2019).

Existing light annunciators comply with GOST R 53325, but at the same time they have significant disadvantages:

1. Due to the small luminous flux, their scope is limited to the interior of the protected object. When placed outdoors, their luminous flux is insufficient, this is especially noticeable in sunny weather.

2. Serviceability of the light annunciator is carried out by monitoring the connecting line, as a rule for open circuit and short circuit. But there are situations when the connecting line is working, and the siren is not, if there is a malfunction of the control circuit or the light source.

3. Not all light annunciators have a sufficient dust and moisture protection class and temperature range for working outdoors in any weather.

The technical problem is the elimination of these shortcomings and the creation of a light siren with a powerful light flux, which provides the ability to monitor the passage of each light pulse. The technical result of the utility model is to increase the reliability of monitoring the operation of the light siren. The problem is solved, and the technical result is achieved by the fact that in the light siren containing a sealed housing, an LED matrix, a control circuit, a control unit based on a microcontroller and input contacts for connecting a network power supply, the control circuit is connected in the siren after the LED matrix, in front of which In series from the input contacts are the switching circuit and the current stabilization circuit.

  figure 1 presents a General view of the proposed siren;

figure 2 - its structural diagram;

figure 3 is a corresponding electrical circuit.

The proposed light siren contains a sealed housing 1, an LED matrix 2, a control circuit 3, a wiring diagram 4, a current stabilization circuit 5, a control unit 6 based on a microcontroller 7, and input contacts for connecting a network power source 8. A control circuit 3 is connected to the siren after the LED matrix 2, before which the switching circuit 4 and the current stabilization circuit 5 go sequentially from the input contacts.

The proposed siren works as follows.

The microcontroller 7 gives a signal to turn on the LED siren, after which the switching circuit 4 supplies a voltage of +36 V through the current stabilization circuit 5 directly to the LED matrix 2. Current begins to flow through the matrix 2, it starts to produce a luminous flux. The current flowing through the matrix 2 is analyzed by the control circuit 3 and, if it is normal, the control circuit 3 generates a signal about the health of the light siren, which is fed to the microcontroller 7 of the warning system. In those cases when the light siren does not receive power voltage or the light sounder start signal or the light siren is faulty, the light sender serviceability signal does not arrive at the microcontroller 7 of the public address system. Then the microcontroller 6 gives a signal about the malfunction of the light siren to the dispatcher (light siren accident).

An example of the implementation of the electrical circuit of such a siren is presented in figure 3. She works as follows.

Switching circuit 4 is a power switch on transistors Q1, Q2 and Q4. In normal mode, when the LED matrix 2 should not be lit at the base of the digital transistor Q1, a logical "0" signal is supplied. Transistor Q1 remains closed. In this case, the transistor Q2 opens, since its base current flows through the resistor R10. An open transistor Q2 shunts the resistor R3 and a potential of the order of 0.1 V is installed on the gate of the transistor Q4. Which is not enough to open the transistor Q4. The transistor Q4 remains in the closed state and no current flows through the LED matrix 2, and it does not glow.

In the notification mode, when the LED matrix 2 should be lit, a logical “1” signal is applied to the base of the digital transistor Q1. Transistor Q1 opens. In this case, the transistor Q2 closes, since the potential at its base becomes close to "0", because the transistor Q1 "pulls" its base to the "ground". If the transistor Q2 is closed on the resistor R3, a voltage of about 18 V. occurs. This voltage is equal to half the power supply due to the operation of the voltage divider R9, R3. This voltage is enough to open the Q4 field effect transistor. It opens and through the LED matrix 2, the current begins to flow, and it starts to glow.

In order for LED matrix 2 to be in normal operation, its current should not exceed 1 A. For this, the current stabilization circuit 5 serves. It includes: resistors R1 and R2, as well as transistors Q3 and Q4. The circuit works as follows: when the transistor Q4 is open, current flows through the LED matrix 2. The same current flows through resistors R1 and R2 connected in parallel. A voltage drop occurs on the resistors R1 and R2, which leads to the partial opening of the transistor Q3. The larger the current flowing through the resistors R1 and R2, the stronger the transistor Q3 opens and the stronger the transistor shunts the resistor R3 and the more the potential drops on it, and this in turn leads to the fact that the conductivity of the transistor Q4 decreases and the flowing through it decreases accordingly current. Thus, the current through the LED matrix 2 is stabilized at a certain level. For the resistors indicated in the circuit, the stabilization current is 1 A, which is optimal for this type of LED matrix 2.

The current flowing through the matrix 2 is analyzed by the control circuit 3. The structure of which includes resistors R1 and R2, a comparator U1, a trigger U2 and a transistor Q5. When you turn on the LED matrix 2, the microcontroller 7 gives a logic signal "1" to start the switching circuit. At the same time, this signal through the resistor R4 and the capacitor C8 is fed to the input R of the trigger U2. The trigger output switches to the logical "0" state, which will lead to the closure of the digital transistor Q5 whose collector is connected to the "control" input of the microcontroller 7 of the warning system. After turning on the LED matrix 2, the current flowing through the resistors R1 and R2 will cause a voltage drop of about 0.6 V on them, with a current flowing through the matrix of 1 A. This voltage drop through the resistor R13 is fed to the non-inverting input of the comparator U1. A direct voltage of 0.45 V. is supplied to the inverting input of the comparator from the divider formed by resistors R5 and R6. Since in this case, the voltage at the non-inverting input is greater than the inverting input at the output of the comparator, a logical “1” will appear, which will switch the trigger U2 to state “1”, which will open the digital transistor Q5. If the transistor has opened, the microcontroller 7 perceives this as a signal that the light annunciator is working. Thus, the passage of each light pulse triggered by the microcontroller 7 is controlled. If there is no power supply to the light siren, the turn-on signal does not pass, the LED matrix 2 is faulty, or the current through it does not exceed 0.75 A, the Q5 transistor does not open and the microcontroller 7 receives a signal about malfunction of the light annunciator. If the control signal does not come from the light siren due to a break in the connecting line, this is perceived by the microcontroller 7 of the warning system as a malfunction of the light siren.

The supply voltage of 36 V is supplied from the microcontroller 7 of the public address system. The switching circuit 4, LED matrix 2 and the current stabilization circuit 5 are fed from it. Control circuit 5 is powered by a 36 V / 5 V converter assembled on a U3 chip, which is a parametric stabilizer for 5 V. The LED matrix is used as a light source in the siren 2 types of BXRC-30E4000-D-73 with an input electric power of about 30 watts calculated for a voltage of 30 V, a current of 1 A and having a light flux of 4375 lm. The housing 1 of the light annunciator has a degree of protection IP66 and a range of operating temperatures from -40 to + 60 ° C, which allows the use of a light annunciator on the street in any weather.

Thus, the proposed design can significantly improve the reliability of the proposed light siren.

Claims (1)

A light siren containing a sealed housing, an LED matrix, a control circuit, a control unit based on a microcontroller and input contacts for connecting a network power source, characterized in that the control circuit is connected in the siren after the LED matrix, before which a switching circuit is connected in series from the input contacts and current stabilization circuit.

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