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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Do high voltage modules produce electromagnetic waves?

I have been experimenting with one of these 3-6V high voltage modules: I know the specifics of how they work, although I have recently been wondering about something. In a video by ElectroBOOM, he ...
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3 answers
88 views

Interface to sense 5kV through microcontroller GPIO

I want to sense the DC voltage of a capacitor from 0V to 5kV. I need to sense that with a standard 5V powered microcontroller GPIO. I need that the solution doesn't dissipate too much heat and it must ...
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Are there serial coils for corona ignition protection?

I did the 50kV power frequency high voltage test for a 22.9kV transformer. We have three types of HV tester. All RMS and peak of output voltages are the same, but the corona ignition voltage is not ...
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2 answers
80 views

If I use a voltage multiplier will the output wattage be less than the input wattage?

A step up transformer steps up voltage and the wattage stays the same from the primary to secondary. Does a Cockcroft Walton generator or Marx generator work this way too? On the full wave Cockcroft ...
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How many stages can I have on a Marx generator and Cockcroft Walton multiplier?

The Marx generator is powered by DC. So does that mean I can add as many stages as I want? Because on a Cockcroft Walton generator people have been having to use high frequency fly back transformers ...
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Power supply design requirements for IGBT driver

I'm trying to determine the proper power supply type and output current requirement to drive a three phase IGBT driver (this is a follow up to a previous question I asked, although focused on a ...
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Whether the LA copper spike rod needs porcelain insulator when installed on a metal rooftop? [migrated]

I am installing a conventional copper rod on the top of a metal roof top I am concerned whether the roof top and the spike rod base are to be insulated with porcelain insulator? Scenario: When a ...
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5 answers
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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% ...
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7 votes
2 answers
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I need to generate a +200V polarization voltage (Stable, low noise, micro-amp output)

Ever play with high end condenser microphones? Like the ones used in test facilities for vehicles, and other stuff? Well I do and it's not a cheap hobby, I have taken care of all the other issues (...
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1 answer
81 views

Sizing of high voltage electric vehicle cables [closed]

I would like to know how to find the wire cross sectional area (mm^2) for high voltage cables for electric vehicles. I also would like to know how to choose the number of strands. System voltage is ...
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HV Rectifier output for APD biasing

I am trying to convert low 5V or 12V to -200V using this device. Which converts it using transformer and rectifier at the output: Can I just attach HV OUT to bias APD detectors? Or is there any ...
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2 votes
2 answers
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Soft Latch ON-OFF with support of DC High Voltage side, compatibile with Arduino or any Low Voltage MCU (with schematic)

First Schematic I'm trying to implement this schematic that I found in this interesting article (Soft Latching Power Circuits). This is a circuit can substitute a mechanical on off switch, and use ...
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1 answer
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Insulation monitoring device for electric vehicle

Good day to all! I am planning on designing an electric vehicle architecture from scratch. My main DC bus voltage is 400 V. However, I have got different voltages in my system. I have got a 600/400 V ...
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2 answers
91 views

Feasibility of 30MW DC transmission over 400m?

We have an electric motor final load of 10-30MW, in an isolated industrial location. The power source could be (Li-ion) battery packs, where each pack outputs 1500VDC, ~500A. Having 10-30 of these ...
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Control power through a resistive load from a DC source and achieve low current peaks

I want to control the power through a resistive load from a DC source and achieve low current peaks. The use case is 0-1000VDC and 0-15kW (not for the entire voltage range). All other parameters and ...
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1 vote
1 answer
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What type of connector is this and how do you safely disconnect it?

While disassembling a Samsung Plasma TV, I've come across this connector labelled "High Voltage" on the power supply PCB. I'm not sure how to remove it from the PCB. It seems to have two ...
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3 votes
2 answers
158 views

Digital voltmeter reading half the voltage measured with Fluke multimeter

I recently purchased these cheap digital voltmeters from Amazon to display the output of my 2.5 kV HV supply. The HV supply has a dedicated 1/1000 output (0 - 2.5V)for monitoring, which I am trying to ...
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-1 votes
2 answers
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Building a high-voltage, high frequency source [closed]

Can someone give an idea of how can I go about building a high voltage (20-30kV) high frequency (0-40kHz) source from a 230V, 50 Hz supply? Is it possible to convert the input 230V, 50 Hz sine ...
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1 answer
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Large series resistor to protect from shock

I built a high voltage generator and want to protect myself against shocks. Would putting a large series resistor on the powering circuit be sufficient to protect me in those cases: I build a large ...
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Why does the Lichtenberg figure form in one direction?

In videos such as this one, we see that the Lichtenberg figure grows from one side to the other, in this case from the left to the right. Why does the figure not grow from both sides and meet ...
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1 answer
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Why are the cylindrical and spherical electrode potential equations different from each other?

There isn't any information about the calculus performed to find these equations but the book says: One dimensional Laplace equation for the cylindrical coordinates depending on the variable "r&...
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1 answer
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Comparator switching randomly

I cut a toroid in half, one half has unknown number of turns (50~80) which are fed to LM339 comparator which is pulled high by 500R to 3.3 V. simulate this circuit – Schematic created using ...
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1 vote
1 answer
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Suitable high voltage source for a cathode ray tube

I'm looking for a suitable high voltage source for the electron gun of a cathode ray tube (CRT.) Slightly simplified the schematic of a CRT looks like: This eBay listing seems to offer something that ...
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1 vote
0 answers
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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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8 votes
4 answers
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Electrification of the London Underground

There are two contact rails in the London Underground: one with 420 V DC and one with -210 V DC. Why not use 630 V and 0 V? Wouldn't it make one of the rails safe for people?
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2 answers
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Relay burns out while switching high voltage solar pump

I have used the following arrangement for switching a solar pump: Input from 3 solar panels (40V/330W each)--> relay switch (S-KAP S90-S-DC05V, 30A 250VAC/30VDC)--> solar pump (8.4A, 30-300VDC, ...
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2 votes
2 answers
105 views

Enclosure connectors for neon light

I'm putting together an enclosure to hold the transformer and dimmer for a small neon sign. I'm quite comfortable with normal AC/DC stuff, but the output from the neon transformer is super high ...
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2 votes
0 answers
137 views

What is the name of this huge high-power test equipment?

It seems very old, maybe more than 50 years, and it doesn't have an information plate.
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-4 votes
1 answer
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Mosquito SOS - Bangalore

We have mosquito rackets at home, i think it is too harsh a way to deal with things living. Is there a way to down the effect of the shock from them? I'm in India, Bangalore.
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1 vote
3 answers
104 views

Can I use a 1kV capacitor for a 5V circuit?

In a different question, it was asked if you could use a relatively higher voltage cap in a 5V circuit (35V cap). It seems that's ok, but I want to know if that logic is still applicable towards the ...
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4 votes
1 answer
71 views

Coupling an AC signal to a HV DC bias with a capacitor and OpAmp

Is it reasonable to float an AC signal on top of a HV DC bias with a HV Capacitor and low input bias current OpAmp? The idea is that a fixed frequency AC signal (~1V pk-pk) comes from the left, is ...
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4 votes
4 answers
780 views

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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Tiny output on high voltage multiplier

A DC voltage multiplier that I built uses a fly back transformer that outputs 15 mm arcs at a maximum (on its own.) When attached to the capacitor/diode multiplier circuit, it produces cm sized arcs ...
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1 vote
1 answer
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Suitable High Voltage source for CRT experiment

I bought a Soviet-era 'new/old stock' Cathode Ray Tube (CRT), historically intended for use in a small oscilloscope. My goal is to explore atomic diffraction (with a hack): But as a chemist/physicist ...
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1 vote
1 answer
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Difference between Working Voltage and Isolation Voltage?

I am building a board to collect data from a 2000V system. The board is going to be powered from a USB port on a laptop and data collected directly into the laptop. I am looking at Isolated 5Vto5V ...
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2 votes
0 answers
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Electric shock through thick rubber tube filled with coolant and carrying a high voltage wire

I have two Litz wires coming out of a coil. The coil is driven with short pulses of 20 kHz sinosoidal voltage with a peak of 1.4kV. Each Litz wire is insulated by 3 thin layers of mylar sheets in ...
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-1 votes
3 answers
133 views

How does high voltage increase power without changing current? [closed]

I am trying to understand the application of high voltage in electric vehicles in order to increase power vs using high current. I understand the Ohms law equation P = I x V but I'm just wondering how ...
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High-voltage oscilloscope probe

I need to measure a high-voltage signal (1kV) with an oscilloscope without a commercial high voltage probe. So I have to design my own 100:1 probe. The oscilloscope has an input impedance of 1MOhm and ...
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1 vote
2 answers
68 views

How to protect differential data lines from ESD?

How do you protect a differential signal line (like Ethernet) without a common ground from high voltage or ESD? Do you use TVS-diodes from Tx+ to Tx-? I thought of using TVS-diode arrays due to their ...
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2 votes
1 answer
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Switching a voltage higher than Vgs MOSFET

In order to drive a voltage higher than the M1 Vgs, I think that limiting the Vgs voltage with a zener diode could be a good idea. It will be only switched once per minute. By this I mean that high ...
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2 votes
1 answer
110 views

Is this boost converter feedback technique a good idea?

I am in need of a high voltage supply, capable of 15mA at around 200V for a valve/tube preamp. This supply has to be low noise and any switching noise kept out of the audio band. The incoming voltage ...
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1 vote
0 answers
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Protection from high voltage in high frequency ignition in plasma cutting machines

I am currently in the process of designing a circuit for detection of a short circuit of a plasma cutter nozzle with material when there is no arc. The important requirement is that detection ...
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3 votes
1 answer
244 views

High voltage +170V based on NE555 design - short circuit

I love Nixie tubes so I decided to build a Nixie clock. I am a beginner. I have one successful design that electronics SE helped me design. That PCB was based on through-hole components and an Arduino....
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2 votes
2 answers
107 views

High voltage power thermal fuse for DC

I am looking for ways to break a high voltage DC power line when an overheating scenario occurs. Preferably I would like to do so using a thermal fuse but can’t find any thermal fuses rated for high ...
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1 vote
1 answer
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Trace clearance and creepage distance between similar high AC voltage paths

In my project I need to control 2 relays from ESP-12E, I have isolated AC & DC side in my PCB design by 4mm PCB Material : FR4, with general Silkscreen coating (green polymer coated) According to ...
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1 vote
3 answers
133 views

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 votes
1 answer
58 views

Can a flyback transformer voltage output be multiplied by a Villard cascade?

I'm trying to keep the setup rather simple for a high voltage power supply I'm making. I'll probably use a ballast to drive the flyback as opposed to perhaps a ZVS board -- feel free to critique this ...
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-1 votes
1 answer
102 views

Why is my MOSFET ON when there is no gate voltage and OFF when there is a gate voltage? [closed]

I have been working on a coil gun but am having trouble with the firing mechanism. My coil gun capacitor bank supplies 400v and instantaneous current of 666 amps based on the resistance of the coil. ...
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-1 votes
3 answers
113 views

Why is the output on my high voltage generator producing more amps than I would expect

I recently bought a high voltage generator of off amazon that apparantly steps up 3-6 volts to 400kV. I wanted to know how much amperage the output woud produce out off curiousity and measured it to ...
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0 votes
1 answer
114 views

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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