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0
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1answer
24 views

Gate controlled turn-on time

Under DYNAMIC CHARACTERISTICS for BT137 is Tgt value set to typically 2us. If I then look under BTA16, I see no mention of the pulse width. Is there a minimum pulse width as a standard value for all ...
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0answers
52 views

BT136 SCR just not firing

I been testing dimmer circuit on breadboard for convenience of testing I been stepping down 230Vac to 12Vac wave and zero crossing pulse is good as it appears on oscilloscope. Then using this ZCS, ...
0
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0answers
29 views

Switching a Thyristor gate while remaining off

Something that I've been wondering about for a while now. Say we have this circuit: simulate this circuit – Schematic created using CircuitLab If the V_switch keeps sending voltage ...
0
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2answers
102 views

Thyristor voltage regulator with different fireing angle for each period with simulink

First of all I'm really low with EE so please, go easy on me. As home assigment we have to design Thyristor voltage regulator in simulink. It should run for 5 periods with different thyristor fireing ...
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0answers
48 views

Thyristor not switching on when 'cold'

I have breadboarded a simple circuit using a 2N6395 thyristor to drive a resistive load. In simulation all works well, and even the physical implementation works sometimes. simulate this ...
0
votes
1answer
104 views

How do I convert 50Hz AC to 60Hz AC using a cyclo-converter?

I want to design a 3 phase cyclo-converter to run a 7.5kW induction motor. The input to the cyclo-converter is 50Hz AC and the output of the cyclo-converter should be 60Hz AC. What are the specific ...
3
votes
2answers
417 views

My half wave rectifier graphic is wrong

Here is the circuit we used (BT169 thyristor): And this is the output: In theory it should be a straight line when AC source goes negative. The question is "Why does it go into the negative ...
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2answers
47 views

High frequency use of thyristors

Can I use an SCR such as BT151 or BT136 (or even a triac such as TYN616), to pass a high voltage(400V) high frequency signal (pulsed DC at 50KHz) for a fixed period? such as 1 second on, then off for ...
0
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1answer
115 views

Low Breakover Voltage Diac [closed]

I wanted to know if there is commercially available Diacs with Breakover Voltage of 20V or less. I tried to find in the internet but always ending up to Diacs with Breakover Voltage of around 30V or ...
0
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0answers
24 views

B6 rectifier if one thyristor's control device is damaged

This one is a task from the last year's exam in electronics. I have absolutely no idea how to solve this. The task was: a B6-rectifier with thyristors, trigger angle 30°, but the control device of ...
0
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0answers
146 views

Will this circuit work as a AC-DC-AC rectifier-inverter?

I'm pretty sure I'm missing one or more things from this circuit and can't figure out what (new to this)! The end goal is that an alternating current will come in, run through the rectifier, then ...
1
vote
0answers
128 views

How can I convert very high, fluctuating, AC voltage to 240VAC at 50Hz?

I'm about to finish a generator-alternator setup which will generate 9-phase AC electricity at (as yet unknown) very high voltage, most likely around 4800V. I'm not sure what the frequency will be, as ...
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2answers
183 views

What are the two gate leads on a thyristor?

I have a simple question: what is the second gate lead on a power thyristor (see the figure below) ? What is it physically attached to ? I understood that the thyristor turns on when you force a ...
1
vote
2answers
260 views

Why are thyristor stacks hung from the ceiling?

The Wikipedia article on thyristors as well as the one on valve halls mentions that thyristor stacks in HVDC applications can be hung from the ceiling or supported by insulators mounted on the floor. ...
1
vote
0answers
264 views

What is a Thyristor Switched Series Capacitor (TSSC)?

I'm struggling to understand the physical difference between the Thyristor Switched Series Capacitor (TSSC) and the Thyristor Controlled Series Capacitor (TCSC). From this book, I understand that a ...
0
votes
1answer
124 views

High power power regulators - thyristor regulator?

I am currently working on a system design that intends to control heating in different zones. All zones in total is calculated to use approx 340kW (230V). This will be divided into 11-12 smaller ...
0
votes
1answer
356 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 ...
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6answers
748 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
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1answer
117 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 ...
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2answers
2k 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
273 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 ...
6
votes
1answer
5k 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
435 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
529 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 ...
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7answers
6k 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 ...
8
votes
1answer
573 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
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3answers
364 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
468 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
6answers
4k 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 ...