What is the difference between thyristor and triac

A silicon Controlled Rectifier is a 3 terminal and 4 layer semiconductor current controlling device. It is mainly used in the devices for the control of high power.

It is made up of a silicon material which controls high power and converts high AC current into DC current rectification. The diac means it has two terminals A1 , A2. It conduction occurs in a diac when the breakover voltage is reached with either polarity across the two terminals.

The triac is like a diac with a gate terminal it's mean three terminals. A triac can be turned on by a pulse of gate current and does not require the breakover voltage to initiate conduction. Newer Post Older Post Home. Popular Posts Advantages and disadvantages of full wave rectifier. As we know that a full-wave rectifier, which can convert an alternating voltage AC voltage into a pulsating direct current DC voltage Advantages and disadvantages of floppy disk.

Floppy disk is a magnetic storage medium for a computer system. This article gives information about the advantages and disadvantages of a f Advantages and disadvantages of star and delta connection. A star-delta starter is the most commonly used method for the stating of 3 phase induction motor. This physical difference plays a role in terms of current switching capability : For load currents up to 25A, triac is a good and easy available solution From 25A and beyond, back-to-back SCR is the best alternative to ensure high power switching capability.

Search for: x To download our technical data-sheets: www. To operate on AC mains, the solution is therefore to use 2 SCR connected back to back: The triggering of the thyristor is done by applying a current pulse positively circulating from Gate to Cathode The latching of the Thyristor to switch Thyristor to on-state condition after a gate current pulse can only occur since : — Anode-to-Cathode voltage is positive — Anode-to-Cathode current after trigger exceed the Latching Current.

Thyistor and Triac are semiconductor devices Because they are semiconductor devices they cannot ensure a galvanic insulation when they are not controlled. In which case using Triac or back-to-back Thyristors : typical application Triacs are based on a single silicon chip whereas back-to-back SCR are 2 separated silicon chips.