Thyristors

Thyristors are four-layer semiconductor devices, also known as a silicon controlled rectifier (SCR) It is like a fast static switch and is good for controlling large amounts of power, they can also control the speed of DC motors.

How do thyristors work?

Thyristors usually consist of three electrodes: an anode (positive terminal), Cathode (negative terminal) and a gate. (You can also get thyristors with two or four leads). The gate is the main control terminal while the main current flows between the anode and cathode Thyristors are made of N-type and P-type materials. The N-type material is formed by doping an element with electrons to increase the number of negative charge-carrying electrons. The P-type material is also produced through doping, although the resulting charge-carrying electrons are positively charged. By alternating layers of P and N-type material, a semiconductor thyristor device is formed. Thyristors are used to create a latching circuit. Thyristors can be turned on using the gate. It then turns off when the voltage across the anode-cathode drops back down to zero.

Types of thyristors

  • Silicon controlled rectifier (SCR) - The basic purpose of an SCR is to function as a switch that can turn on or off small or large amounts of power.
  • Silicon controlled switch (SCS) - Silicon Controlled Switch (SCS) is a device similar to an SCR, but it is designed to turn off when a positive voltage/input current pulse is applied to an additional "Anode gate".
  • Triac - Triac gets its name from Triode for alternating current Triacs are similar to SCRs but it conducts in both directions, (a bidirectional device). This means that it can switch AC and DC currents., Firing circuit commander modules are required for this.
  • Four-layer diode - A four-layer diode has 2 pins and is similar to a voltage-sensitive switch. When the voltage between the two pins exceeds the breakdown voltage it turns ON, otherwise its OFF.
  • Diac - Diac is a mix of the words diode and ac switch it is similar to a four-layer diode but it can conduct in both directions meaning it can contact both AC and DC currents.

Applications of thyristors

Thyristors are commonly found in many everyday applications such as:

  • Motor speed controls
  • Pressure control systems
  • Light dimmers
  • Liquid level regulators

...
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RS-artikelnummer 658-148
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VarumärkeSemikron
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Tillv. art.nrVS-50RIA40
VarumärkeVishay
249,54 kr
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50A SCR TO-65 400V - 1490A Thread Mount - 100mA - - 2.5V - 200mA
RS-artikelnummer 169-5920
Tillv. art.nr50RIA40
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162,104 kr
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50A SCR TO-65 400V - 1490A Thread Mount - 100mA - - 2.5V - 200mA
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Tillv. art.nrZVS-16DV
VarumärkeUnited Automation
827,21 kr
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- - - - 16A - Screw Mount 3.7kW - - - - - -
RS-artikelnummer 462-142
Tillv. art.nrMCD200-16IO1
VarumärkeIXYS
895,88 kr
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216A SCR Module Y4 M6 1600V - 8.6kA Panel Mount - 150mA - - 2V - 150mA
RS-artikelnummer 168-4524
Tillv. art.nrMCD200-16IO1
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216A SCR Module Y4 M6 1600V - 8.6kA Panel Mount - 150mA - - 2V - 150mA
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Tillv. art.nrPSR-25
VarumärkeUnited Automation
537,15 kr
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- - - - 25A - Panel Mount 6kW - - - - - -
RS-artikelnummer 379-6518
Tillv. art.nrPAC-2
VarumärkeUnited Automation
891,51 kr
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- - - - - - Screw Mount - - 3500Vrms 250V ac - - -
RS-artikelnummer 193-969
Tillv. art.nrMCC255-16IO1
VarumärkeIXYS
1 554,70 kr
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250A SCR Module Y1 CU 1600V - 9.6kA Panel Mount - 150mA - - 2V - 150mA
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Tillv. art.nrSKPC200-440
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RS-artikelnummer 878-1631
Tillv. art.nrS8035KTP
VarumärkeLittelfuse
51,408 kr
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35A SCR TO-218AC 800V - 500A Through Hole - - - - 1.5V - 50mA
RS-artikelnummer 103-7543
Tillv. art.nrBT151-800R,127
7,032 kr
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7.5A SCR TO-220AB 800V - 132A Through Hole - 15mA - - 1.5V - 20mA
RS-artikelnummer 194-265
Tillv. art.nrMCC312-16IO1
VarumärkeIXYS
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320A SCR Module Y1 CU 1600V - 10.1kA Panel Mount - 150mA - - 2V - 150mA
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Tillv. art.nrVS-113MT160KPBF
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1 268,16 kr
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110A SCR Module INT-A-PAK 1600V - 1.18kA Panel Mount - 150mA - - 2.5V - 200mA
RS-artikelnummer 168-4477
Tillv. art.nrMCC255-16IO1
VarumärkeIXYS
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250A SCR Module Y1 CU 1600V - 9.6kA Panel Mount - 150mA - - 2V - 150mA
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Tillv. art.nrDCR370T18
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370A SCR Type G 1800V - 5000A Stud - 300mA - - 3V - 200mA
RS-artikelnummer 165-7641
Tillv. art.nrX0402MF 1AA2
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0.9A SCR TO-202 600V - 33A Through Hole - 0.2mA - - 0.8V - 5mA
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Tillv. art.nrBT148W-600R,115
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0.6A SCR SOT-223 (SC-73) 600V - 11A Surface Mount - 0.2mA - - 1.5V - 6mA
RS-artikelnummer 669-6042
Tillv. art.nrDMPR3-E-50kW 415V
VarumärkeUnited Automation
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- - - - 50A - Screw Mount 36kW - - - - - -
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Tillv. art.nrMCC312-16IO1
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320A SCR Module Y1 CU 1600V - 10.1kA Panel Mount - 150mA - - 2V - 150mA