Electronics lec 4
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This document provides an introduction to electronics components. It discusses switches, relays, contactors, solid-state relays, semiconductors, and PN junctions. Relays are electromagnetic switches that use a magnetic field to open and close contacts. They have a coil to generate the magnetic field and auxiliary contacts. Contactors are similar to relays but are used to connect or disconnect loads. Solid-state relays switch on or off with a small external voltage and consist of a sensor and electronic switching device. Semiconductors have electrical conductivity between conductors and insulators that changes with temperature. PN junctions are also discussed but not described.
Electronics lec 4
- 1. Electronics an Introduction Eng. : Mohamed ElKenany
- 2. Contoso S u i t e s 2 Electronics :-
- 3. Contoso S u i t e s 3 Electronics :- ▪ Switches
- 4. Contoso S u i t e s 4 ▪ Switches Electronics :-
- 5. Contoso S u i t e s 5 ▪ Switches Electronics :-
- 6. Contoso S u i t e s 6 ▪ Relay ▪ It is an electromagnetic switch which use magnetic field to open and Close its contacts ❑ coil ❑ Auxiliary contacts Electronics :-
- 7. Contoso S u i t e s 7 ▪ Relay Electronics :-
- 8. Contoso S u i t e s 8 ▪ Relay Electronics :-
- 9. Contoso S u i t e s 9 ▪ Relay ▪ moving parts in relay which is used To connect or disconnect our circuit 1- Cannot afford main loads 2- used In control circuits ❑ Auxiliary contacts: ▪ Relay may have more than one contact ▪ Max current 20 Amp ▪ Latching relay ❑ Coil: ▪ Is an electrical conductor, wire in the shape as Coil, when current is passed through the wire of The coil it generates a magnetic field it has standard Voltage ranges “5, 7, 12, 24…” DC “12, 24, 110, 220…” AC Electronics :-
- 10. Contoso S u i t e s 10 ▪ Relay Electronics :-
- 11. Contoso S u i t e s 11 ▪ Contactor ❑ Coil ❑ Auxiliary contacts ❑ Main contacts ❑ Parts in contactor used To connect and disconnect our loads ▪ DC powered coils, they generate a constant magnetic field that guarantees an appropriate closing of the contacts ▪ AC powered coils generate sinusoidal magnetic fields which produce a force that drops to zero twice each cycle (50/60 Hz). This creates an undesired chatter or pulsation of the contacts. This harmful effect can be cancelled by using a shading ring placed in the contactor core ▪ It is an electromagnetic switch which use magnetic field to open and Close its contacts Electronics :-
- 12. Contoso S u i t e s 12 ▪ Contactor Electronics :-
- 13. Contoso S u i t e s 13 ▪ Contactor Electronics :-
- 14. Contoso S u i t e s 14 ▪ Contactor ▪ Power of your load or its maximum current ▪ Range of voltage of control circuit “to select coil” ▪ Number of auxiliary contacts and its type “NO, NC” ❑ There are some important information that you must know. Electronics :-
- 15. Contoso S u i t e s 15 Electronics :- ▪ Solid-state relay A solid-state relay (SSR) is an electronic switching device that switches on or off when a small external voltage is applied across its control terminals. SSRs consist of a sensor which responds to an appropriate input (control signal), a solid-state electronic switching device which switches power to the load circuitry.
- 16. Contoso S u i t e s 16 Electronics :- ▪ Solid-state relay
- 17. Contoso S u i t e s 17 Electronics :- ▪ Semiconductors A semiconductor material has an electrical conductivity value falling between that of a conductor, such as copper, and an insulator, such as glass. Their resistance decreases as their temperature increases.
- 18. Contoso S u i t e s 18 Electronics :- ▪ PN Junction
- 19. Contoso S u i t e s 19 Electronics :- ▪ PN Junction
- 20. Contoso S u i t e s 20 Electronics :- ▪ PN Junction
- 21. Contoso S u i t e s 21 Electronics :- ▪ Breadboard