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Questions tagged [high-voltage]

Questions related to the design of circuits that supply or use a high voltage. There are a few definitions but the IEC definition of a high-voltage supply system is above 1000 Vrms AC or 1500 V DC.

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9 votes
2 answers
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A redesign of a bulky 12 kV source

I’m a low voltage electrical prototype designer. Currently I’m working with a client that had a circuit that transforms 240 VAC (50Hz) to around 2400 V. After that they use a Cockcroft Walton ladder ...
Johan Karlsson's user avatar
0 votes
0 answers
25 views

Choosing a power supply for making a Hasel Actuator [closed]

I'm planning to build a HASEL actuator and need to buy a power supply. There are many options out there, and some are quite expensive. I've found a few affordable ones and was hoping you could help me ...
forasle's user avatar
1 vote
0 answers
56 views

Does anyone know the history of the SBM-20 Geiger Tube?

I know they were manufactured by the Soviets, but anything more than that I'm unsure of. I really want to know who originally designed the tube and what companies manufactured it and where it was ...
rhett a's user avatar
  • 11
1 vote
2 answers
65 views

How can a Class E Power Amplifier be built and experimented with safely?

Given that Class E RF amplifiers, even those that generate less than a few watts, can easily generate voltage spikes approaching (or exceeding) 100 V, how can they be homebrew built and experimented ...
SRobertJames's user avatar
  • 1,121
3 votes
1 answer
113 views

Switching 5 kV for a neon sign

I have a project where I want to make something like a 7-segment display using neon tubes. Using neon tubes is a hard requirement, so I cannot use LEDs etc. I do not want to use one 12 ⇒ 5 kV ...
DarcyThomas's user avatar
4 votes
0 answers
69 views

In a high voltage insulator with multiple discs, when is it advantageous to gradually increase their diameter?

What engineering considerations go into gradually increasing the diameter of dielectric discs for high voltage standoff insulators? I recall seeing high voltage insulators that had small diameter ...
James Bowery's user avatar
0 votes
2 answers
51 views

Safety considerations when measuring an analog signal across an isolation barrier

I'm designing a PCB that is powered by 230V AC and switches 5 heating elements via 5 Triacs. As a best practice I included optotriacs for driving the main triacs and used a 230V to 5V buck converter ...
DreiDe's user avatar
  • 3
2 votes
0 answers
93 views

Electron beam welding light arcs and insufficient vacuum [closed]

I have an electron beam apparatus in a small vacuum chamber. When powering the holder and grid cap to high voltages somewhere between 1-10kV while the filament is heated, the following visually ...
Magemathician's user avatar
0 votes
2 answers
60 views

Capacitor Insulation Questions

I wanted to create a high voltage parallel plate capacitor with a positive voltage connected to its positive plate and ground connected to its negative plate. Can I get away with a thin sheet of ...
Robert Francis Jr's user avatar
9 votes
3 answers
2k views

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 ...
rando's user avatar
  • 193
0 votes
0 answers
34 views

Confusion around 3-wire/4-wire three phase voltage sensing

I'm trying to understand the voltage sensing setup when measuring three phase voltages in a 3 wire system (like Delta with no neutral) or a 4 wire system (like WYE) or Delta High leg (delta with ...
Junior's user avatar
  • 1
0 votes
2 answers
49 views

How to drive P-Channel MOSFET For Highvolatge Precharge Ciruit in BMS Application

I am designing a BMS for 24S NMC (100.8 V) and looking for perfect solution for precharge on high side. I designed this circuit. It would be awesome if you folks comment on this and please let me know ...
Ajay Panwar's user avatar
1 vote
1 answer
40 views

Problem: Transient Voltages in Grounding Circuit Cause comms loss

I am working with a Hipot unit to break down a DUT. The Hipot is powered by an independent 220V Ckt. In my test setup I have a PC and another unit, both of these are powered from separate 120V ...
Juan Antonio's user avatar
0 votes
2 answers
59 views

Effect of high voltage electric field on the motion of charged particles in an isolated tube

Please refer to the image for a visualization of the schematic. I feel I am trapped at this stage. I am trying to understand the following: In a closed container, charged particles are moving from the ...
Neeraj's user avatar
  • 3
0 votes
1 answer
46 views

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 ...
16-bit-apps's user avatar
0 votes
1 answer
61 views

power supply for small volume plasma

I need to power a small plasma source (about 1 1/2 inches internal diameter) with a single wire like anode. The target pressure range is up to a couple of hundred millitorr. I have been looking at ...
gpowell's user avatar
0 votes
0 answers
27 views

High voltage and lightning protection

I am developing an IoT device intended for use in agricultural fields. This device features an 8-channel 220V/3V3 (opto-isolated) system and includes an energy analyzer. Additionally, it incorporates ...
Mehmet Günce Akkoyun's user avatar
7 votes
3 answers
838 views

Why do electric arcs rise?

I am a junior electrical engineering student, recently we were learning about the circuit breakers and professor showed us a video of an electrical arc which can be seen in the picture (Sorry for the ...
kaan's user avatar
  • 377
0 votes
2 answers
52 views

high voltage moderate frequency galvanically isolated current measurement

Given a conductor carrying a sawtooth wave of anywhere between 0.1Hz and 855kHz up to +-1.5kV) and anywhere between +-(1µA...20A)(maximum 650W) i want to measure the current with about 5MS/s (so the ...
user338269's user avatar
1 vote
1 answer
42 views

Creepage and clearance in a dielectric fluid

I'm designing a DC low voltage system ( 1000VDC) with immersion cooling. I have been referring to EN 60664-1 to size clearance and creepage distance, but this standard is ok for air only. Is there any ...
PatAll's user avatar
  • 11
0 votes
0 answers
33 views

Testing Industrial Magnetron with Megohm meter?

Magnetrons can have a variety of failure modes, I'm trying to come up with a better test besides applying high voltage in a system and blowing fuses, or blindly swapping it out for a new one when an ...
MadHatter's user avatar
  • 3,536
0 votes
1 answer
38 views

Can a ground connection for a 230VAC device go to a 0V of a 24VDC circuit?

So, here is the situation: We are designing a small oven made out of aluminum. For it we plan to use a power adapter from 230VAC to 24VDC. The problem is that the temperature controller we have ...
lexax127's user avatar
0 votes
1 answer
71 views

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 ...
Still's user avatar
  • 15
-1 votes
1 answer
113 views

What is the breakdown voltage of air (actually)?

Everyone knows that the breakdown of pure, dust-free, dry air is around 32kV per cm. Despite doing a lot of research I can't seem to find even a range of values for ordinary air that consistently ...
16-bit-apps's user avatar
1 vote
1 answer
53 views

Fast high-voltage diode stack (for snubber circuit)

I have a specific application in mind, but a more general question regarding diode stacks. System overview: We have a constant-current source which is driving a constant current through a magnet. We ...
PulsePowerFTW's user avatar
2 votes
1 answer
67 views

Cable shield connection to metal enclosure on rolling stock

It's standard practice to ground cable shields at both ends to prevent EMC issues. I am uncertain if this practice applies to enclosures installed on train roofs. In my setup, I have an I/O cable ...
M.A.T's user avatar
  • 55
0 votes
1 answer
81 views

How to increase current by reducing voltage? [closed]

I have a 400kv HV generator of 500 mA , but I want to increase the current by 10 time or more by reducing less voltage as possible/sufficient , help
Vighanesh Nyk's user avatar
-6 votes
1 answer
161 views

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 ...
user avatar
0 votes
0 answers
79 views

HV output flyback converter voltage spikes reduction

I'm trying to reduce the voltage spikes on the output of a high voltage output (~400 VDC). This output is used to apply a stimulus on a patient to evoke a response, so the output load depends on the ...
SukMyMEMEz's user avatar
0 votes
0 answers
39 views

How can I insulate cables using a copper braid too thin to sheathe them?

I have high-voltage SHV cables that I need to shield using a copper braid. I am using sensitive electronics and these cables appear to be a source of noise. The only copper braid that I have available,...
C. Crt's user avatar
  • 121
3 votes
3 answers
240 views

Help me understand this high voltage amplifier circuit

This question is about the circuit which also present in here: Help me understand this high voltage amplifier circuit for driving a piezo actuator I have some follow up questions: What is the reason ...
MFU's user avatar
  • 31
2 votes
2 answers
301 views

Measurement of high voltage

For research lab work, we use a high-voltage generator to create one pulse with a low intensity (< 4 mA). The voltage range is variable from 100 V to 3000 V and the FWHM of the pulse is ~1 ms. The ...
ludo's user avatar
  • 23
0 votes
0 answers
40 views

Risk of Insulation Tester / Megger damage from voltage breakdowns?

I've purchased an insulation tester capable of outputting 5kV and measuring resistance up to 1000 GΩ, as detailed in the manual available here. While my tests are not prone to significant breakdowns, ...
15 Volts's user avatar
  • 707
2 votes
1 answer
56 views

Step-down, ultra-low current kVDC and boosting current [closed]

I have a constant current source that can only give a maximum of 1 μA DC but can maintain this current level from less than 1 V to a few thousand volts, depending on the resistive load. I calculated ...
nothingreh's user avatar
0 votes
0 answers
49 views

ESP32 shielding inside an inverter

I am thinking about using an ESP32 as a secondary controller for a 12 V DC to 220 V AC inverter to monitor and control overload, low battery, using relays to switch AC output, etc. The inverter will ...
asim's user avatar
  • 600
0 votes
1 answer
123 views

Flash memory corruption possible reasons?

I am working with an external Serial Flash memory (Winbond 25Q80). I could read-erase-write the flash memory using SerialFlash library in arduino environment. But it seems data of flash memory gets ...
Shekhar Saha's user avatar
1 vote
1 answer
53 views

Reconciling High Drain Voltage with Typical V_BE Drop in nMOS+PNP IGBT Configuration

I'm examining two design methodologies for IGBTs (Insulated Gate Bipolar Transistors) and have encountered a puzzling issue regarding the drain voltage in the nMOS part of an nMOS+PNP IGBT ...
Qiu Junpeng's user avatar
1 vote
1 answer
87 views

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 ...
nusch's user avatar
  • 11
2 votes
3 answers
302 views

Using TO-92 package for high voltage applications

I'm looking to build a high voltage (but low current) current source and I see transistors rated at 500V in a TO-92 package. The leads aren't even bent so spaced 50mils/1.27mm apart, and when ...
Joe's user avatar
  • 199
1 vote
1 answer
70 views

Balancing high voltage and ESD safety for a work bench [closed]

I own various large stainless steel benches which I'm using to sit heavy equipment (200kg+ per bench). Some of this equipment will need new electronic components i'll have to wire up, such as 120vac ...
srb633's user avatar
  • 113
4 votes
2 answers
238 views

Inductor - Voltage rating and Saturation

An inductor has rated operating voltage (across inductor) = 75 V. Suppose 100 V comes across it for some microseconds (~ less than 1 us). What will happen? Is the operation dangerous in such cases? I ...
Andr7's user avatar
  • 275
2 votes
1 answer
110 views

Apparent contradiction in op-amp datasheet

I'm building a high-voltage regulator whose error amplifier is an op-amp. I'm relatively new to op-amps and currently using cheap single-supply LM324 so mistakes don't cost much. The error amplifier ...
Joe's user avatar
  • 199
4 votes
1 answer
192 views

How to check the high voltage of a electrostatic device?

I want to build a device with two metal plates which needs to have 3000 VDC between them. The way that I am thinking is to use a ferrite transformer from a 9 VDC transformer with a transistor that ...
plopper's user avatar
  • 41
2 votes
1 answer
51 views

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 ...
Alia Sana's user avatar
0 votes
1 answer
61 views

Can I use a laptop backlight inverter as a tube power supply?

I would like to build a circuit that has a magic eye in it. That needs ~290V. I was wondering if I can/should use a CCFL inverter (salvaged from an old laptop) to generate that voltage, maybe driving ...
The Bishop of Canterbury's user avatar
0 votes
5 answers
163 views

Detecting 16 V AC with a GPIO

My project involves detecting a ringing doorbell. The doorbell circuit is 16 V AC and I want a low-voltage binary signal from it. The obvious way to me is to transform that electrical signal until ...
Jonah's user avatar
  • 155
2 votes
3 answers
125 views

Spark gap alternative

I am building a simple Tesla circuit with a 50-100 kV transformer and capacitors, discharging through a spark gap into the circuit. Is there anything besides a spark gap that would accommodate that ...
Ericm20E's user avatar
1 vote
2 answers
174 views

Operation amplifier input HV protection

I have a setup consisting of 8x AD8428 ultra-low noise opamps on a PCB to measure very small voltages with a noise floor of around some 100uV and a low-pass filter up to 10kHz. The input is connected ...
NNN123's user avatar
  • 103
0 votes
0 answers
28 views

Raspberry Pi DAQHAT: Overvoltage issue

I am working on development for a piece of HV test equipment, where I need to monitor the voltage output for a circuit that is actively arcing. I am measuring the voltage off of a Raspberry Pi DAQHAT (...
C-LEC's user avatar
  • 1
-4 votes
2 answers
96 views

What are the Best Methods for Creating Pulsed DC or AC Current at 2.4 - 2.5 GHz Frequency Range?

Some of you may be aware that UFOs are sometimes recorded emitting microwave radiation. I think they might be using an electromagnetic coil that is being pulsed with DC current or is using AC current ...
Robert Francis Jr's user avatar

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