All Questions
Tagged with transformer high-voltage
146 questions
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2
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Ground to Phase potential in a ungrounded tri-phase network
I would like to know the possible potential difference between a phase and the earth of an ungrounded three-phase network (intermediate network of figure below).
I can't find out if there's a ...
- 11
1
vote
1
answer
114
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Would this configuration of microwave oven transformers work to make a simple arc welder?
I know arc welders typically require 15-30 volts and 100-200 amperes to work.
I have two microwave transformers in which I have removed the secondary winding and wound 15 turns each of heavier wire ...
- 21
1
vote
1
answer
174
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Theory of high-voltage spark generators using pulsed transformers
I was looking to build a small electric spark generator and stumbled across this circuit or slight variations of it more or less everywhere I looked:
I am not entirely sure of the way it works since ...
- 109
3
votes
1
answer
165
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Flyback SMPS - Poor efficiency and hot core
I built a flyback SMPS intended to produce ~800 V (variable) from a 12 V input (basic schematic below). I'm using a TL5001 PWM controller with an inverting gate driver, to drive a SiC MOSFET (GeneSiC ...
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3
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2k
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Why does this arc die in the center?
I discharged a capacitor across the primary of an old microwave oven transformer. As expected, the transformer made a huge spark. I am generating the spark by charging a capacitor with a bug zapper to ...
- 193
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1
answer
70
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Troubleshooting my DIY Tesla coil setup
Firstly let me say I'm relatively new to HV, so apologies for any silly mistakes. I made a Slayer Exciter circuit, powerful enough to drive a flyback transformer and make 3mm sparks. The circuit is ...
- 119
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1
answer
77
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Experimenting with "high voltage" positive and "high voltage" negative using an ignition coil
Experimenting with "high voltage" positive and "high voltage" negative using an ignition coil.
I would like to compare a high-voltage positive to a ‘high-voltage’ negative using an ...
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-6
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1
answer
169
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How is unequal current flow created?
This video discusses residential power distribution systems, and the magnetic fields that surround them. At the 36 second mark of the video, the presenter states
We have a distribution line issue ...
user326224
1
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1
answer
95
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Hard time to understand building 250 V HV from 3.3 V and problem with transformer
I have built PicoEMP device ( https://github.com/newaetech/chipshouter-picoemp ) device which diagram I'm attaching:
It's basic role is to built ~250 V voltage from 3.3V GPIO and release it through ...
- 11
2
votes
1
answer
57
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Isolation voltage spec in transformer
Could you please help me understanding this transformer spec?
I am planning to use HCTSM80101AAL transformer and I would like to make sure that I am referencing the proper specification for voltage ...
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1
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1
answer
90
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Do Kirlian setups work with DC power? [closed]
I have been trying to build a simple Kirlian setup, and I've been trying to make my flyback transformer work, to no avail, so I shifted to use the small black 3.7 V to 400 kV transformers (as they ...
2
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1
answer
477
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Why does my flyback transformer simply refuse to work?
I've been trying to create a Kirlian setup like the one in a video by 'The Plasma Channel', and the flyback transformer for the power source just refuses to work.
I have a T1010A transformer, and I'm ...
0
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0
answers
428
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Reverse Transformer For Smooth High Voltage
So I want to make a valve audio preamp, but need a way to generate clean high voltage DC for the plates of my tubes. I started with rolling my own boost converter which worked well, but was unable to ...
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1
answer
188
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Flyback transformer with no load situation confusion
I am having a slight confusion in the no load situation of the flyback transformer. Consider the high pulse at the gate of the mosfet turning on the switch. At this case the current will increase ...
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0
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77
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Lifetime of the transformer in a high voltage power source
I am solving a problem with the design of a high voltage power source. The problem is related to the lifetime of the transformer (1 primary + 2 secondary windings). The power supply has 50-100VDC at ...
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2
votes
1
answer
108
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Filtering spikes in electric fence energizer
I have designed a 12V electric fence energizer. It works as follows:
A flyback converter charges a 50uF capacitor to 400V. After the capacitor has been successfully charged, a thyristor discharges the ...
1
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2
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1k
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Flyback vs. Coupled inductors vs. Transformer?
So I am in the process of making a high voltage power supply and after a failed attempt at using a modified MOT and difficulties finding a flyback transformer, also difficulties understanding how they ...
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3
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What are these circular basket-like structures on a high voltage transformer's insulators?
Wikimedia commons contains this public-domain image of a high-voltage transformer of the Tarza power plant in Iraq, taken by Marvin Daniels in the U.S. Army:
There is much I do not immediately ...
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0
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1
answer
455
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Transformer turn ratio in DC-DC flyback converter for high voltage output
I have been for the past 3 months trying to design and experiment with topologies to charge a high voltage capacitor up to 1 kV. I have settled on a classic flyback topology:
I have tried several ...
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3
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2
answers
277
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Why need voltage doubler when transformer can be made for full voltage
I have seen old vintage tube power supply (for example Heath HP-23A), that transformer secondary is roughly 300v RMS and a voltage doubler is used at output to obtain 750+ V DC for vacuum tube anode. ...
- 475
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75
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How do I make this circuit work without using mosfets?
I've come across circuits that utilize MOSFETs to drive a center-tapped transformer, but unfortunately, I don't have any MOSFETs on hand. Since I'm working on a circuit for a Geiger-Muller tube, I don'...
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3
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118
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Possible downstream dangers of common 5Vdc power supplies
Let's say you have a 5Vdc/2A power supply that is hooked to some kind of power transformer or DC/AC converter that generates 120V+. The example I am thinking of is a nixie clock device that is powered ...
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1
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369
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How do I modify my flyback transformer to output 5kV?
I was wondering how to modify this circuit to end up with a 5kV power supply. I watched a Video by the Plasma Channel on YouTube on a similar design but it outputs 15-20kV which is too high for my use....
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1
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How does a microwave oven transformer shunt help resonate the voltage doubling capacitor?
I was reading this great answer by Neil_UK, and a comment-question was:
Comment Question 1
Are MOTs belonging to the general type called "Leakage/stray field transformer" ?en.wikipedia.org/...
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1
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138
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9 VDC to 450 VDC circuit
I am trying to create a low-amperage circuit that can turn a DC voltage of around 8.3-12.0 V into 400-450 V DC for the purpose of charging a capacitor bank.
I do not need high amperage at all, as all ...
0
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0
answers
91
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Finding power factor of primary windings of a transformer
A transformer rated at 250kVA with nominal voltage 20/0.4kV outputs 400V to a load with a power factor of 0.8.If the resistance of the primary windings is 15Ω , the reactance of the primary windings ...
user334808
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0
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80
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Check if flyback transformers are working
I recently got 3 flyback transformers for $21 at a store which are all different. They were most likely harvested from old TVs. However I am not sure if they are still functioning. I tried to test by ...
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0
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209
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How do I clean up the static in this musical flyback transformer?
So I built this musical flyback transformer off of Franzoli Electrctronics schematic,
https://franzolielectronics.com/easy-flyback-i/.
I had to go the through hole method and it works. However, the ...
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3
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325
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How do we use step-up transformers to get a very high voltage compared to the initial voltage?
In some medical equipment like CT we find that the voltage entering the equipment is around 380 V, but then it's increased to be around 70 kV to 140 kV.
To increase voltage we use more turns on the ...
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2
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How to safely switch a high voltage transformer?
I am trying to make a small model internal combustion engine controlled electronically with an Arduino.
The idea is that fuel is injected and ignited with a small spark from a small high voltage ...
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3
answers
2k
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What are the limits of transformer turn ratios?
For applications where very high voltages are needed, like pulse generators, what stops one from simply using a transformer with an absurdly high turns ratio like 1:1000? If this were doable, core ...
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1
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47
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Recommended modelling software for 200 μs pulse width pulse transformer application
I am looking to model a HV pulse generator that involves discharging a 6 μF capacitor at about 300 V across the primary coil of a transformer. This discharge happens about once every 1.5 seconds. The ...
3
votes
1
answer
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800V to 250V pulses conversion
I need to convert 800V output from Pockels Cell driver, at 52 kHz of bandwidth.
Load is capacitive 11pF (drawing a surge current of 100 mA or more), specifically an Electro-Optical Modulator that ...
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1
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160
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Flyback transformer parameters - Inductance [closed]
I am designing a power supply (flyback SMPS) with universal input (120 - 240 VAC) and 6 V @15 A output (90 W). For this purpose, I have shortlisted the pwm switcher NCP1219 - selected because it doesn'...
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5
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163
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Help designing a safety indicator for a high current transformer
I'm working with a neon sign transformer and want an indicator (preferably a light) on the high/output side to give me a visual cue when there is current coming out of the transformer. I'm not 100% ...
- 3,502
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0
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122
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Help in understanding a Capacitive Voltage Transformer
I have been reading up about CVT’s and trying to comprehend some of the parts of the typical circuit which include:
A potential divider (C1 & C2).
An inductor tapped from the potential divider.
A ...
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votes
4
answers
865
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Best practice for 2 kV enclosure
I'm making a Lichtenberg machine from a microwave transformer, and I wanted to put my setup in a enclosure to make it safer. The input voltage is 120 V AC and the output voltage is around 2200 V AC. ...
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4
answers
2k
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What's the function of a feedback coil?
I have seen many different high voltage circuits that require high voltage. A few of these circuits use transformers, however I only ever notice a primary and secondary coil. When taking apart a ...
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1
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Selecting a SMPS transformer
I am in the process of selecting a transformer for my SMPS design and need some help in doing so. I am trying to design a universal input - 54 V constant voltage output SMPS.
Looking at the data sheet ...
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2
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2
answers
1k
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Intrawinding capacitance in high turn transformers
There seems to be a known phenomenon about high turns ratio transformers drawing no-load current in higher voltages with higher frequencies.
The intrawinding capacitance in the secondary (Cds in the ...
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0
answers
140
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I can't switch on both coils in double arc lighter transformer
I was trying to make DIY plasma lighter (and kind of made it too) but I can't figure out something.
The transformer has 2 primary and 2 secondary coils so I made a NE555 signal generator with 36 kHz ...
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2
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362
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Generate 1000V 30A AC from a 12V lead acid battery for a short period, but in a cycle
I am trying to trigger a device which requires a current of 1000V 30A current for operation, but for a very short period. It just needs to be powered for a maximum of 50-100 milliseconds but 6-8 times ...
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0
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230
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Resonant Transformer / Resonant Inductive Coupling
I´m trying to build a resonant transformer (or a resonant inductive coupler, I don´t know if the names fit to the topology I´m showing, anyway). The idea is to develop a high voltage on a capacitor. ...
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63
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3
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Is this video fake? I thought Tesla coils only worked on AC
This video shows a 9-volt battery connected to a wire as a primary.
The first reason I think this is fake is that he is powering a Tesla coil with 10 volts.
The second reason is that Tesla coils work ...
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3
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1k
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What makes Tesla coils better than conventional transformers at generating high voltages?
The voltage gain of a Tesla coil can be determined from the primary and secondary inductances \$L_1\$ and \$L_2\$ using the following formula (Wikipedia has a simple derivation):
$$ \frac{V_2}{V_1} = \...
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3
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352
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Piezo driver IC or 0-5V to 0-300V translator IC
I am new to electrical engineering applications so please excuse any lack of correct language.
I am looking for a 4 pin (2 on each side) or 8 pin 2 channel IC that translates a voltage difference on ...
2
votes
2
answers
239
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Is there any good way to limit primary current on a low inductance transformer?
For a while, I used hand wind transformers to make high voltage (250v, then several stages of cockroft walton to 750-1000v) from ~12-24v at around 10khz and max 100ma on the primary side. But of ...
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3
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591
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How to increase a transformer's primary voltage rating?
I want to know if there's a way to operate a normal (250 VAC primary rating) transformer at higher primary voltage levels, as I have an AC voltmeter project using a microcontroller (currently using ...
3
votes
2
answers
605
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Delta-Wye transformer differential protection during external line to line faults [closed]
During these kind of line to line faults current flows in the faulted phases of the secondary and all phases of the primary as it is shown in the image. So now the currents in phase A are not equal to ...
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2
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3
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258
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Current transformer energy harvesting from a mid-voltage line
I'm planning on harvesting energy from a 33kV line which has an average 10rms A current. The main conductor (N1) has a overall diameter of about 13mm.In the beginning I tried to harvest around 3-4 W ...