Instituto Superior Tecnologico
PUBLIC "JOSÉ PARDO"
burglar alarm
SCR
WITH ELECTRONIC
STUDENT:
MACAHUACHI BARBOZA, ROSA ESTELA
PROF. ADVISORY: ABDEL
ROJAS
MY PARENTS, AND MY FRIENDS OF THE NATIONAL BIBLIOECA PERU, THAT HELPED ME WITH BOOKS AND IDEAS TO BE ABLE TO CARRY OUT THIS GREAT PROJECT.
ISTP. JOSE PARDO "
FOREWORD.
THYRISTORS
thyristor is called to all semiconductor component with 2 stable states consisting of several semiconductor layers, 3 or more pn junctions, 2, 3 or 4 terminals. Classification
Unidirectional: Drive Bidirectional
one way: They drive in two ways
have unidirectional Within:
SCR: silicon controlled rectifier
GTO, thyristor gate off
SCS: dual gate thyristor
SUS: LASCR
unilateral switch, thyristor light-activated
Within the bi are:
TRIAC, DIAC
triode CA: CA diode
SBS: Switch bilateral
THYRISTOR SCR
are able to control 2000A, 4000V. The working frequency is 50-60Hz (thyristor network) can work with frequencies up to 200KHz (fast thyristors).
are used in the controlled rectification and power all the techniques that are used to modify any representation of electric power.
Rating:
P-SCR: SCR
type N:
Properties:
is an almost ideal switch even when it is in conducting state has a voltage drop of 2V.
easily controlled rectifier. Relative speed
Macahuachi Barboza, Estela Rosa.
ISTP JOSE PARDO "
INTRODUCTION
As its name implies, SCR is a rectifier built with silicon material with a third terminal for purposes of control. Silicon was chosen because of their high temperature capabilities and power.
The basic operation of the SCR is different from the semiconductor diode of two fundamental layers, in which a third terminal, called a gate, determines when the rectifier switching state open circuit to closed circuit. It is not enough just to forward bias the anode to the cathode of the device.
driving in the region of the dynamic resistance of the SCR is typically 0.01 to 0.1. Reverse resistance is typically 100 kg or more.
ISTP. JOSE PARDO "
WITH SCR burglar alarm.
PROBLEM 1.1 Introduction
In all locations are constantly increasing thefts in the departments, temporary or occasional empty, with more intensity in large cities than in small towns.
currently takes place at any time of year and not just during the holiday exodus.
The number of such thefts is very high, and for that cause most cases it is vain hope of identifying and recovering the stolen responsibilities. This type of crime, together with auto theft, ranked first in the classification of crimes unpunished
1.2 PROBLEM FORMULATION
thefts mostly occur by showdown, economic failure or simply are committed by persons of evil life. To counter these crimes
It follows a theft protection system
1.3 OBJECTIVES GENERAL AND SPECIFIC.
OBJECTIVES.
By joining this project, we get a light or sound alarm with two types of circuits: an open circuit and closed circuit. SPECIFIC OBJECTIVES
A. Have a simple and homemade alarm for our personal protection and material.
B. Protection not only from home, but cars and / or other equipment.
IMPORTANCE OF RESEARCH
to establish the electrical short circuit operation of the alarm, you can use a micro pressure or any other contact system is operated to open the door or window to be protected. Use of this system is very simple and requires no special care
Thanks to this simple alarm, be comfortable leaving, for example, house or anything else that is under our care.
This new alarm can be installed across a corner and you can between neighbors is security, because when the alarm sounds the neighbors will be watching and ready to act.
CHAPTER I
ISTP. JOSE PARDO "
CHAPTER I
burglar alarm
WITH SCR 1.1 DEFINITION
The main component of this circuit is an SCR (Rectifier Silicon controlled), which acts as security or electronic switch. Initially, the SCR does not conduct and the LED does not light.
control circuit alarm consists of two types of switches, one closed and one normally open. When the switch S1 is closed, current flows through R1, to the gate of SCR. The same happens when the switch S2 opens, current flows through R2 and D1.
In both cases, a positive voltage appears at the gate of SCR and this leads anode and cathode LED lighting.
Then we say that the alarm is activated.
As the SCR is closed but the voltage is removed from the gate, the alarm will stay on regardless of the position of the switches.
can be connected to the auxiliary output, a buzzer of 6 or 9 volts or a relay that can handle a high volume siren.
This circuit can also be powered with a car battery of 12 volts and can take account of not overloading the SCR with a current higher than its capacity.
The switches most commonly used sensors are magnetic. These consist of two parts: a small magnet that attaches to the door or window of a moving part, and a fixed part having a switch that activates when approaching the magnet.
In this normal state, with the door or window closed, the switches are closed to have the magnet close, when you open the door or window is opened and the switch activates the alarm.
1.2 DESCRIPTION OF THE DEFINITION
A. The SCR is an electronic switch that closes when a positive voltage applied to its gate or "Gate."
B. THE SCR 's are used in a number of circuits Agran, from burglar alarms to lightings and sequential rhythmic. 1.3
historians.
Within the family of pnpn devices, silicon controlled rectifier (SCR) is undoubtedly the most interest today, and was first presented in 1956 by the Bell Telephone Laboratories. Some of the most common application of the SCR includes relay controls, time delay circuits, regulated power supplies, static switches, motor controls, trimmers, investors, cicloconversores, battery chargers, protection circuits, controls heating and phase controls.
in recent years have been cycles cycles SCR to control powers as high as 10 MW and individual values \u200b\u200bas high as 2000 A at 1800 V. Its frequency range of application has also been extended to about 50 kHz, which has allowed some high-frequency applications
Instituto Superior Tecnologico Publico.
JOSE PARDO "
CHAPTER II OPERATION OF SCR
2.1 SUB-SUB TITLE THEME 2.1.1
OPERATION
SCR Silicon Controlled Rectifier) \u200b\u200bis an electronic switch, which closes when applied voltage on the gate or "Gate."
An SCR is a diode, but with a difference. As a diode is the cathode and anode, and passes current in one direction, also has an additional terminal called the gate or "Gate." The gate is used to push or trigger the SCR conduction state. Only when the gate receives a positive voltage, drives the SCR.
Then, although the suspension that voltage, the SCR continues to conduct.
The only way to stop driving, is to remove or change the voltage polarity is positive at the anode. 2.2
SUB-TITLES USED AS 2.2.1 SCR.
The SCR's are used in a large number of circuits, from burglar alarms up lighting equipment and sequential rhythmic.
Below is a diagram of a simple circuit using an SCR and serves to more clearly understand its operation.
In this circuit, the cathode (C) and anode (A) of the SCR, are connected via a buzzer and a switch to a 12 volt battery.
However, no current flows through the buzzer and it does not sound because the SCR is not conducting. No driving, because the "gate" or gateway is connected to the negative battery through the bridge between points A and B. Remember
SCR only conducts when a voltage at the gate. If
bridge between A and B is stopped, the gate is disconnected from the negative and positive voltage passes through the resistance R1
At this point, the SCR conducts and the buzzer sounds.
Now, this is very important, but back to connect the bridge between points A and B that have no effect on the SCR. Once the gate to trigger the SCR conduction state loses control over its operation. The only way to disconnect the circuit is open the swich SI, thereby removing the voltage of the SCR. If we close SI again, the alarm is activated. CURRENT AND VOLTAGE
PERMITTED
As Diods, the SCR's are classified in terms of their ability to handle current and voltage. THE GE106B1. SCR is a widely used, has a capacity of 2 amps and 200 volts.
ISTP. JOSE PARDO "
CONCLUSIONS 1. The SCR is a multipurpose switch, which is very easy to manipulate.
2. The technical values \u200b\u200bare entrusted to the editor during the control and verification.
BIBLIOGRAPHY
• Project complete electronic
KIT .- "Basic course in applied electronics"
· Electronics modern applied 4
Sybil P. Editor in chref
Parker.
Third Circuit Integrated Technical issues
REDE, paragraph 35400-Barcelona.
- Internet Links
www.google.com www.wikipedia.com
www.comunidadelectronicos.com
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