# 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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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
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 ...
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 ...
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 ...
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 ...
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 ...
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 ...
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 ...
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
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 ...
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 ...
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 ...
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 ...
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 ...
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. ...
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'...
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 ...
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 ...
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 ...
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 ...
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 ...
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
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 ...
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 ...
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% ...
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
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 ...
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 ...
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
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 ...
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 ...
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 ...
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 ...
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
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 ...
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 ...
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
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 ...
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 ...
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 ...
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 ...
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 ...
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 ...
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,...
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 ...
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&...
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 ...
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 ...