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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4 votes
3 answers
311 views

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 ...
1 vote
5 answers
125 views

Potential problems when using a high resistance voltage-divider

I want to design a circuit, that allows me to measure the voltage across a piezoelectric transducer. The transducer itself has an impedance |Z| of 500 Ohms up to ~20 kOhms. The voltage to measure ...
0 votes
1 answer
69 views

Connecting different ground together [closed]

I need your help on how to connect my ground together when designing my PCB. I have only one input with a ground (PGND) and one output with a ground (HGND). Both are high voltage and high current. I ...
0 votes
1 answer
33 views

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 ...
0 votes
0 answers
36 views

Grounding a bi polar high voltage pulser

This was a "brain teaser" in a circuits class, where only theory is required. Any equations or vocabulary to look into would be greatly appreciated. The question is the following: You are ...
2 votes
2 answers
106 views

Are large pulsed currents the most deadly type of electric shock?

As opposed to sustained electric shock via DC or AC? I might be wrong, but when people are killed by electrocution it is usually due to a large current of very short duration passing through their ...
0 votes
0 answers
39 views

Issue from my buck/boost converter

After my simulation, I am getting this in my output, which does not look good at all. I find it difficult to find a spice model for DC/DC isolator that can give me a positive, negative supply, and ...
0 votes
0 answers
58 views

Grounding a 25kV power supply [closed]

I'm building a project which requires a 25kV power supply. How should I ground it? I read somewhere about hammering copper pipes into the ground and attaching it that way. What would be the cheapest ...
3 votes
5 answers
15k views

Tapping energy from high voltage AC transmission lines

The details are hazy as I recollect this from my nipper days.Many, many years ago. “Persons were charged with stealing electricity by placing a large coil, somehow, near high voltage AC transmission ...
1 vote
1 answer
1k views

High Voltage Totem Pole Driver

I have the following MOSFET driver circuits for high side P-Channel MOSFETS. The circuit works for supply voltages up to 20 volts. It gives some satisfactory results for it's range, but I would like ...
3 votes
1 answer
43 views

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 ...
0 votes
1 answer
52 views

Which electrode configuration should have the highest electric field produced?

I'm currently simulating the the electric field produced by different types of electrodes. The electric field is observed on the insulator that is sandwiched between 2 electrodes, one being 10 kV ...
3 votes
3 answers
6k views

Simulation for a transmission loop using PowerWorld

I am now learning how to use PowerWorld Simulator. However, I faced some problems when I tried to enter the data given in the paper. I want to simulate the following transmission loop: First things ...
-1 votes
1 answer
87 views

230V 3 phase connection. Where do I get 230V from?

I’m in bit of a puzzle here. I have a 10HP/230v/3 phase air compressor that I am trying to hook up to power. I currently have 3phase 480V and a 75kVA delta wya transformer. I originally thought the ...
-1 votes
1 answer
60 views

Please explain the interaction I observed between a GFCI receptacle and a 3000 volt arc

The high voltage leads of a 120 to 3000 volt transformer, current limited to 30 mA, were each wrapped around a small nail. The nails were allowed to rest upon a piece of wood soaked in an electrolyte. ...
-2 votes
1 answer
40 views

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'...
4 votes
1 answer
358 views

Simulation isn't working for high voltage amplifier

Been trying to simulate on multisim a circuit I saw about high voltage amplifier: The input is 8 Vp-p and 100Hz and reached to output of 1800 Vp-p and 100Hz. The publisher mentioned he used the ...
0 votes
3 answers
114 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 ...
0 votes
1 answer
63 views

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 ...
3 votes
1 answer
364 views

Simple, compact 9V DC to 400V DC step up

I'm attempting to create my own Geiger-Muller counter based on an old, soviet STS-5 tube. I want it to be as compact as possible. I don't want to use ready-made modules, like this one, instead I ...
0 votes
0 answers
33 views

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 ...
-1 votes
2 answers
86 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 ...
1 vote
0 answers
31 views

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 ...
0 votes
1 answer
67 views

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 ...
0 votes
5 answers
91 views

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% ...
7 votes
2 answers
286 views

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 (...
1 vote
1 answer
442 views

Boost converter to high voltages (20 kV+)

I am interested in making a mini, potentially portable ion thruster. The Question: Is it possible to create a boost converter that takes low voltage batteries ranging from 3.7 V to 24 V and boost that ...
4 votes
1 answer
79 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 ...
0 votes
1 answer
94 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 ...
1 vote
0 answers
40 views

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 ...
0 votes
1 answer
181 views

Circuit for high voltage pulses using raspberry pi PWM to drive a piezoelectric actuator

I am trying to engineer a device to separate red blood cells from blood plasma in 100mmx1mm capillary tubes using the raspberry pi GPIO pin PWM feature and a piezoelectric actuator. The pulses ...
2 votes
2 answers
63 views

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 ...
2 votes
3 answers
1k views

Breadboard type for valve circuits?

I want to play with valves running at 300V. Is there some suitable form of breadboard or prototyping system that anyone is aware of? Clearly you wouldn't use one of those common white push in ...
0 votes
1 answer
554 views

Connecting the secondary side of ignition coil to earth

I have an ignition system used for some application. During the testing I found that spark plug is producing EMI due to spark occurrence and high voltage is traveling through the wire. So to suppress ...
1 vote
1 answer
98 views

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 ...
0 votes
2 answers
310 views

What is the pinout of this transformer?

I have a large transformer and I just can't figure out its pinout. I simply want to make a high voltage circuit but can't find the proper coils. One side has 2 wires whose resistance is 0.8 ohms and ...
-1 votes
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 ...
1 vote
1 answer
88 views

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 ...
0 votes
1 answer
67 views

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 ...
4 votes
0 answers
115 views

What determines the voltage rating of a cable?

I'm trying to figure out the maximum voltage of some cables in a vacuum system I've inherited, and I'm confused by the DC voltage ratings given by this supplier as they step from the 3 kV to 10 kV ...
3 votes
2 answers
168 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 ...
-1 votes
2 answers
104 views

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 ...
0 votes
1 answer
78 views

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 ...
2 votes
3 answers
2k views

Is it possible to use capacitor for isolation instead of optocoupler?

I designed a Buck converter which drives several LEDs. The PWM signal, which has a certain fixed duty cycle, is generated by a 555 timer IC. The circuit which drives the Buck MOSFET, including the 555,...
0 votes
0 answers
63 views

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 ...
0 votes
1 answer
47 views

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&...
4 votes
1 answer
701 views

High Voltage Cascode with MOSFET LT Spice Simulation

I'm an electronics engineering student and want to develop a high voltage switch with normal Si N-MOSFETs. After some research, I discovered cascode switches for this application. Most of these ...
0 votes
1 answer
1k views

Trouble shooting ZVS driver

I've posted a few question on this forum about ZVF drivers and you all have been a big help and I'm hoping you can help me again. Forgive me if this is a bit long, I just want to be through.   Above ...
0 votes
1 answer
70 views

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 ...
2 votes
3 answers
2k views

Magnetron and microwave

I took apart a Kenmore microwave in order to salvage the magnetron, transformer, and the HV capacitor. The transformers, HV capacitor, and the magnetron from the microwave are intact. Is it possible ...

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