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0
votes
1answer
45 views

Three-Phase Thyristor Converter Simulation Question

I am required to simulate a three-phase full wave thyristor converter using MATLAB Simulink. The circuit I have so far is given below: The three input sources are 230V each at 50Hz, the first ...
0
votes
5answers
183 views

How to throttle power consumption of a heating coil?

Which is an appropriate but simple electrical circuit to reduce the energy (power) consumed by a heating coil which has an AC feeding without generating an asymmetric load (large DC component, e.g. ...
0
votes
1answer
57 views

Controlling AC devices using ATmega8

I have an microcontroller ATmega8, TRIAC MOC3083 and thyristor M166P. I need to develop and device which will turn on/off lamp(220V). But while I'm developing I don't want work with AC 220V now, DC ...
2
votes
2answers
735 views

Average output voltage of a fully controlled full wave rectifier

What is the average voltage for a fully controlled bridge rectifier with firing angle \$\alpha\$ ? In a lot of web resources it is said to be: $$\frac{V_{max}}{\pi} (1+ cos(\alpha))$$ For example ...
3
votes
2answers
177 views

Why doesn't the leakage currents automatically turn on thyristor?

I understand that when \$TR_1\$ and \$TR_2\$ are ideal transistors, we need an initial \$I_G\$ current pulse signal in \$G\$ to turn on the thyristor. This \$I_G\$ will turn on \$TR_2\$ and the ...
5
votes
1answer
3k views

Optotriac+triac: how do I calculate the gate resistor

I am building a small circuit to turn on/off a 200W heater. I am using a MOC3023 and a BT136. At the datasheet of the the optotriac, this circuit is recommended: My question is how is the 180Ohm ...
1
vote
1answer
355 views

time delay circuit keeping line high

I'd like to create a simple circuit for keeping a line "high" for a few seconds after being triggered high, without any external power. To specify it in more detail: given three inputs, 3.3V, GND and ...
0
votes
3answers
435 views

Turning ON a Thyristor

Well, I've recently started reading about thyristors and I have been stuck by something my instructor said about the turn-on process. During the forward-biased state of the thyristor the junctions ...
11
votes
7answers
4k views

How to build a 2N6027 PUT?

Similar to this question, I need a replacement for a programmable unijunction transistor [PUT]. Specifically, I'm trying to emulate the behavior described in the 2N6028 datasheet. However, I would ...
7
votes
1answer
458 views

Thyratrons: How they work, what they are used for, and how to read their datasheets

I recently ran into an interesting device called a thyratron. I have a basic understanding of thyratrons as gas filled vacuum tubes. I understand that they can switch large amounts of currents and ...
5
votes
3answers
333 views

Switching-on/off 1000V * 1000A in 10ns

I know that kind of things could be done by thyratrons, but wikipedia says that they are being phased out by semiconductor devices. Could anyone suggest which kind of devices can switch on that fast ...
4
votes
3answers
394 views

what is a thyristor

As part of my 2330 lv3 am required to know about thyristors. I just want to confirm my understanding is correct. A thyristor is basically similar to a transistor, only it stays switched on when it's ...
5
votes
4answers
3k views

Replacement for 2N6027

I am working my way through Make: Electronics. For some experiments in this book, you need a 2N6027 programmable unijunction transistor (PUT). The shop I am buying my parts from doesn't have this ...