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2nd session of R&A Transistors & couplers. Agenda T ransistors as switch. T ransistor testing. O pt couplers. R elays. S imulation with Proteus 7 professional.

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Presentation on theme: "2nd session of R&A Transistors & couplers. Agenda T ransistors as switch. T ransistor testing. O pt couplers. R elays. S imulation with Proteus 7 professional."— Presentation transcript:

1 2nd session of R&A Transistors & couplers

2 Agenda T ransistors as switch. T ransistor testing. O pt couplers. R elays. S imulation with Proteus 7 professional program.

3 Transistor working theory Consist of two diodes back to back. By controlling states of the two diodes, we can control the switching of the transistor (ON-Off). Look at this program to get the idea !!!!

4 Transistor OFF state

5 Transistor ON state

6 Transistor testing

7 Opt Couplers Opt couplers make an isolation between interfaces of two circuits. typically consist of a gallium arsenide LED (light-emitting diode) and an optical receiver such As phototransistor or light-triggered diac. The two are separated by a transparent barrier which blocks any electrical current flow between the two, but does allow The passage of light.

8 (AC/DC) Isolation

9 DC/DC Converter

10 6 Pins Package

11 8 Pins Package

12 Relays An electromechanical or solid-state device operated by variations in the input which, in turn, operate or control other devices connected to the output. They are used in a wide variety of applications throughout industry, such as in telephone exchanges, digital computers, motor and sequencing controls, and automation systems. Bins configuration (No,Nc,C,Coil).

13 Simple circuit

14 Relays -5 Pins

15 (DPDT) Relays -8 Pins

16 Controlling Motor Direction

17 Question ???!!!!! W hen you will use Relay instead of Opt coupler in your application and vise versa??!!!

18 Simulation Proteus 7 Program

19

20 Introduced by E ng. Mustafa Ahmed Hemdan. C hairman of Robotics &Automation Chapter C ommunications & Electronics department. E -mail: hemdan@ieee.org M ob: +20173220460 O ur blog : http://rastsc.wordpress.com O ur group on facebook : R obotics & Automation Chapter


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