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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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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 ...
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Wouldn't Charge Flow On Power Lines Due to Capacitance

If I touch one line of an exposed power line (say 300 kV AC) and the rest of my body is freely suspended (only in contact with air), am I not forming a capacitor (to ground)? If I am, are electrons ...
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What is this component and how can I drive it?

A long time ago as a kid I disassembled a plasma globe. Inside was a small board with a box-like plastic-enclosed component. This component has a long wire which leads up to the center of the plasma ...
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Multi-stage coilgun - power source?

I am building a coil gun and am considering making it multi-stage. I want to activate them all at once and keep them on until the projectile reaches each coil, at which point they would shut off. ...
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Can a coil gun be made with a boost converter instead of caps?

So I’ve been starting to build a coilgun, and I find most designs either have capacitors or are just really bad. But could a high-voltage boost converter (40000v) and a momentary switch not be used to ...
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Home made High voltage Capacitors

Im building my own high voltage capacitors, for science, and I'm running into an issue. Im 90% sure what I'm looking at is coronal discharge but I wanted to be certain. The caps are two aluminum foil ...
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82 views

Current sensing on negative 1.1kV rail

as i mention above i am searching somehow to do high side current sense on a -1100 DC volt rail . My current region is up to the 500 μA . Any ideas or suggestions would be extremely helpful. My ...
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52 views

Safety Capacitor Selection

When selecting an X2 safety capacitor what must be taken into consideration. There are only a few types of capacitance ranges and seem to be chosen based on voltage rather than capacitance. Take ...
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70 views

Capacitive discharge excess being used for battery recharging

I am currently designing a circuit similar to a cattle prod that is intended to be attached to a drone. The cattle prod is powered by a lithium-ion battery, charging up a capacitor and then quickly ...
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63 views

High side current sensing for negative high voltage

i need to monitor the current for a negative high voltage supply. I implemented the following circuit to a simulation programm https://www.maximintegrated.com/en/app-notes/index.mvp/id/1867 But i ...
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What is the purpose of galvanic isolation?

Is it correct to say that the primary reason to have galvanic isolation (ensuring minimum clearance and creepage distance for required voltage of power circuit between HV and LV) between the HV power ...
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Modbus map for high voltage batteries

we just bought a high voltage battery storage system (7kW) and solar pv package (10kW) lately. The battery is an LG Chem 7H with a Huawei SUN2000L 3KTL Hybrid inverter. We have two options for our ...
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Looking for resources for determining cable requirements for high wattage (MW) applications

I'm doing some personal research on the specifications for cables that can handle megawatt power draws. As an example, the wires needed to supply 450VAC @ 2000A (0.9MW). I'm looking for wire diameters ...
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Flyback Transformer Output Voltage Testing

Recently, I purchased an electrostatic precipitator power supply as a means of providing a high voltage DC output (-5 - -40 kV DC). The power supply is rated to supply 60 kV DC at 600 W and can be ...
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Please Critique my HV Measuring Setup

At the moment, I am working on a device that will be able to measure the out put of a high voltage DC power source with an adjustable output of 0 - -60 kVDC and 0-15 mA (the typical power being 600 ...
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High Voltage Measuring System

I am looking to set up a voltage-measuring system for the output of a recently purchased HV power source. The source supplies around 0 - -60 kV DC and 10 mA to my load. Unfortunately, the source does ...
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High voltage 1100 V current sense on the high side

I have the circuit that you see below. My load is a photomultiplier tube equivalent to a 3.63Mohm resistor. My power supply can deliver max 4W (2kV and 2mA). I use it on 1100V and the load draws ~...
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Tool for Measuring Low Current

I currently have a power supply that will be able to supply around -60 kV DC and 10 mA under the load that I will be hooking up to it. However, the internal resistance of the load will fluctuate and ...
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What is the maximum voltage that silicon can handle?

Today, in a race for efficiency, we have moved from transformers to switching power supplies. Almost all PSUs were designed for single-phase low-voltage operation (220Vac/310Vdc in my country). I've ...
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Problem with setting initial voltages in LT Spice

I was trying to set an initial voltage for a capacitor I was modeling in LT Spice, and I tried using the command .ic V(Vc)=20000 (Vc is the node directly after the capacitor, with ground on the other ...
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Type of wire for high voltage applications

What kind of wire is most suitable for HV low-current applications, where the allowed maximum is 25 kV and 5 W? By type of wire I mean core and type of insulation. As far as I can guess, even if the ...
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167 views

Current limiting ballast for a transformer

So, guys, I hope you can explain to me how to calculate the necessary parameters for a ballast to limit the current on the primary side of a high voltage transformer.It is for a tesla coil project. To ...
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How do failure modes of high voltage cables play out?

I fix x-ray equipment, and here is the connector that fits into the x-ray tube. It carries up to 150kV, and maybe 500mA during exposure. My boss tells me if I see some black carbon deposit on the ...
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Alternatives to High Wattage Resistors? (Do multiple low-wattage resistors equal a single higher wattage resistor?)

I am a beginner, so I may have made a horrible mistake in my diagram, but I am trying to learn. According as I have figured it, I am having an issue wherein I need a resistor rated for a minimum of ...
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51 views

Test Equipment for generating large voltage spikes

I am trying to test a tachometer circuit which takes large voltage spikes from an inductive pick up and conditions them for TTL logic. I need input voltages in the order of 200V peak-to-peak but most ...
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electric fence fuse

I have built a circuit like this. It is powered by a 12V car battery that gets charged through a solar panel, and it uses a car coil to create the high voltage. The designer of the circuit suggests to ...
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1answer
82 views

Switch high voltage with triggered spark gap

I want to switch a high current/voltage pulse (up to few 10kV, <1kA) from a capacitor as supply. It needs to be cheap and I don't care about efficiency too much yet. I took a look at using ...
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3 switches, one lamp with existing wiring [duplicate]

I have an existing wiring with two switches for 1 lamp. How to add third independent switch without changing to much wiring inside walls (usual wiring [with the triple switch in the middle of ...
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3answers
152 views

Process for Making a Flyback Transformer

I am looking to make my own flyback transformer that can put out a DC voltage from 0 to -40 kV DC and a power of 400 watts, as most commercial flybacks do not go up to the specified power and ...
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2answers
55 views

High current/high voltage/high frequency measurement

I have a circuit that I'm having trouble understanding. It measures the current flowing through a conductor. The measured load is 20-100 Amps, 9kHz-34kHz, and approx. 340 volts. The main conductor ...
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1answer
60 views

Damaging BCD-to-decimal decoders?

(ACTUAL QUESTION IS AT THE BOTTOM) I am a beginner in electronics and am learning more day-by-day to my best. I first got interested in Nixie tubes a few years back, so those are what I play around ...
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40 views

Calculating capacitance for a ripple-smoothing device

I recently purchased a flyback-based power supply 1 with the claimed capability of supplying (-5) to (-60) kV DC and 10 mA (adjustable speed). However, the output seems to be relatively unstable for ...
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81 views

Controlling a high voltage relay by a PC USB

My 2.1 speaker's transformer is consuming active power even when the PC is off. I know it because it is always warm. Thus, I want that only when my PC is operating the transformer will get the AC ...
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Power Barrel Connector Voltage Rating Inquiry

My system is using 48V at 3A max. I am currently looking for a power connector to my PCB that can handle my specifications. I came across a potential connector, but I noticed on the data sheet it is ...
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Building a High Voltage Rectifier with a continuous negative output

simulate this circuit – Schematic created using CircuitLab In the past, I have worked with high voltage projects, but seldom with HV rectifiers. Thus, I was curious how I could build a ...
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1answer
51 views

Triggering a camera flash with a microcontroller

I took apart a "one-way-camera" for the flash part and found a circuit very similar to the image. For a project I need to trigger the flash with a microcontroller (attiny25/45/85v, low voltage version,...
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1answer
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Current transformer (CT) and potential transformer (PT) grounding

There is several documents say that for three-phase instrument transformers (CT,PT), there should be only one grounding point. With this argument, can I short the the secondary sides of current ...
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Voltage Drop for Power Supply Testing

I recently bought a 10-30 kV DC, 8-10 mA power supply that I am looking to test before its incorporation. However, the retailer advised me that I should place a load on this power supply - as one ...
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1answer
37 views

Flyback from ignition transformer?

I'm using a 10kv ignition transformer for a jacob's ladder. It works great! Currently though I've only tested it on its own circuit. But I would like to have this thing running in my lab. (I know not ...
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91 views

Current limiting for jacob's ladder?

I have a 10 kV 23 mA ignition transformer. Apparently the way to make a jacob's ladder is to just connect the electrodes to the secondary, plug the primary into the wall, and call it good. But of ...
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RF Attenuator Failure

I am attenuating an audio frequency (50 KHz) signal that is pulsed at 666 W for 300us with a period of 300ms. I estimated the power dissipated averaged over a period to be approximately: \$\frac{300 \...
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130 views

How to make an Arc welder out of 3500v bug zapper transformer?

I got a transformer from old bug zapper it has 3500v output , can I use it to make an Arc welder by removing the secondary windings and put 10 gauge wire windings instead. I saw some videos on ...
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113 views

how do electrical arcs occur?

I was under the impression that arcs form due to high voltage, that the breakdown of air was typically 3 million volts per meter. However, arc furnaces typically use low voltages, around 30 to 40 ...
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1answer
68 views

Insulating from static electricity

I am happy to announce that my pocket extra-strong static electricity generator project is now complete and works well. However there is one problem, I am often getting zapped severely (to the extent ...
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2answers
115 views

What effect would a hydrogen bomb detonated at high enough altitude have on the power grid and solid state electronics?

After reading several dozen reports on EMP effects of nuclear explosions and viewing archived government footage of nuclear weapons testing I have come up empty handed. As for example let us assume ...
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Producing energy from lighting bolts

An average bolt of negative lightning carries a current of 30 to 50 kiloamperes, transfers a charge of 5 coulombs, and dissipates 500 megajoules of energy (120 kg TNT equivalent, or enough to light a ...
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Protective diode across dump load

I have a rectified DC Voltage and I will switch in a dump load resistor. I have a 25PV045 Schottky diode connected across it as a flyback to deal with the inductive properties of the load when the ...
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55-650V to 5V DC/DC convertor design

For an application I am building I need a custom DC/DC convertor that can convert a voltage ranging from 60V-600V to a contant voltage of around 5V. Using the TI Webench with the paramaters Vin_min = ...
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264 views

Build a High-Voltage High-Frequency Power Supply

I need to build a HV HF power supply to ionize gas. The specifications are 12V input voltage and 10kV output voltage @ 13.56MHz. I know this is not an easy task at all, since in this frequency area, ...
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Powering 5W generator with A23

Can I use a small 12V A23 battery to power this negative ion generator? Will it burn or will it last for long?