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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62 views

Is it possible to protect against ANY overvoltage?

Inspired by this question. Suppose I'm making something like a security system and I'm worried about a malicious person trying to knock it out with high voltage on some of the incoming wires. Let's ...
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1answer
54 views

Sourcing Transformer with Specific Turns Ratio

I am looking at a building an electronics project that calls for a transformer with a specific turns ratio '1:4:50', and am trying to source a component. I am working on the project from this tutorial:...
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Switching n-MOSFET as Solid-State Relay

I'm trying to design a simple solid state relay that can be in the off state when an AC Source is applied (schematic one) and then source up to 150mA to a small resistor when that AC Source is removed ...
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72 views

Can I divide 3kV pulses with a voltage divider?

The pulses are generated with a high voltage push/pull switch that outputs high voltage pulses at the voltages it being fed by a DC high voltage power supply and the signal is controlled by its TTL ...
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1answer
109 views

What to use instead of transistors [closed]

Hi guys I have a problem... I can’t seem to find a transistor powerful enough to take 10000v, what would I use instead? Or if you know of a transistor that would take 1A and 10000V please redirect me ...
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1answer
51 views

Purely Solid-State Circuit Withstanding 1kV, able to source 125mA

I'm looking to design a purely solid-state circuit that can perform the following: Handle an AC Source with Vpk=1kV and act like an open circuit. (Schematic 1) When the source is removed and replaced ...
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37 views

Modify Spark Ignitor Circuit for Bug Zapper Functionality?

I have been doing some research on building my own bug zapper circuits for use in an art project (just for arcing electricity, I'm not killing any bugs), in particular finding a good source for ...
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1answer
38 views

High Voltage NMOS layout design in UMC130nm process using Cadence Virtuoso

I am required to design an NMOS switch in UMC130nm process which is capable of enduring approximately 10V VDS (drain to source) when the gate is 0V. And a current of approximately 50mA when the gate ...
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1answer
64 views

Why does sparking occur while unplugging a 40V DC, 6A load from a source?

To start with, the problem was two-fold (sparking at plug-in as well as at unplug). The plug-in problem was solved by introducing a delay in MOSFET 'turn-on.' Would there be a way to solve the unplug ...
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54 views

How to convert high AC voltage generator to DC voltage to charge a capacitor

I have bought several high voltage generator which outputs AC voltage. I wish to convert this high AC voltage to DC voltage to charge a capacitor. I have tried connecting the output (10kV) to a 20kV ...
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56 views

what's the fastest way for switches the high voltage?

i want to use relay for project that the electricity will turn on and off about five times per second ... 30 volt 5 ampere DC i think will work for the project , and the load is Resistive ... is there ...
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1answer
48 views

High voltage PSU resistors

I've looked at a dead power supply and see transistors, ICs, an optocoupler, etc and have come across what the board says are resistors[ R<#>]. Resistors that I've come across are the typical 3/...
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2answers
75 views

Why can't I get any proper arcs out of this flyback transformer?

I salvaged a flyback transformer from an old TV and used it in a single MOSFET driver like this: I used 6 turns of insulated copper wire to make the primary coil with the centre tap and again 6 ...
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2answers
60 views

Detecting very high voltages

I work for a plastics molding company and we manufacture containers that we need to verify do not have holes in them. I am looking design a fixture that will apply a very high voltage (about 15-30KV) ...
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1answer
79 views

How are high voltage power lines earthed?

Most high voltage power lines run on a delta configuration with three phases and no neutral. Now if there isn’t any neutral (due to the nature of it being a delta system) then how can the power line ...
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3answers
112 views

Current sense resistor for high voltage

I have a 5KV DC output from a Cockcroft-Walton multiplier. The current is around few microamps as per the simulation. To prevent discharge, the 200Mohm resistor holds the voltage of the Cockcroft-...
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1answer
73 views

High Voltage Safety Questions

I'm working on a project that uses 1700VDC provided from a 220V:1200V isolated toroidal transformer, bridge rectifier and filter cap. I have no experience with high voltages, so I'd like to ask you ...
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11answers
6k views

Should I ground my body when working with 200V+?

I was working on a project converting 220V AC to 5V DC and I accidentally touched the underside of the transformer which gave me a big shock and I was wondering if it's a good idea to ground my self ...
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1answer
38 views

Zero Sequence current Understanding

In literature zero sequence current is called DC component. If it was DC component then how a zero sequence current in neutral grounded secondary of a transformer cause current in neutral grounded ...
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1answer
70 views

Best way to switch electronically between different voltage sources for measurement

I am trying to make a circuit that can measure voltage between three different terminals. The Voltage under measurement can range upto 0 to 1500V. As you can see in the circuit, I want to Measure the ...
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1answer
38 views

Thin film capacitor for voltage multiplier

I am designing a voltage multiplier with 5 to 10 stages. I have this circuit where I run a transformer at 450KHz and feed the output to the voltage multiplier. Is it a good idea to use thin film ...
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1answer
29 views

BLDC motor, typical maximum isolation voltage in DC

For one of 1/3 or 1/2 hp, can I aply a instantaneous 400VDC on it together with PWM (of around 50-200hz), safely? Do commom BLDC motors cumply with that spec?
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1answer
56 views

How to modify TL431 current limiter to work with 80V bus?

I referred following circuit from TL431 datasheet TL431 max voltage at cathode is 36V. since circuit has only a transistor , how to modify this circuit to work with 80V at input(Vi bat). output ...
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1answer
60 views

What is the minimum PWM frequency that LT1999-10 can capture with smooth output settling?

I am referring data sheet of LT1999-10, My PWM signal is 100Hz duty 5% resolution 8 bit I have a doubt, Data sheet - 2MHz bandwidth Is this IC able to capture 100Hz PWM signal? will output of IC ...
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0answers
37 views

Is it possible to measure pwm load current using opamp based high side current sensing?

I am referring this app note, hope to use as unidirectional current sensing for a PWM load PWM load - load is a resistor, PWM signal - 100Hz, 150V. Load current 18mA Duty 5% (PWM resolution 8 bit) ...
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3answers
2k views

How OPA333 withstand 400V bus without burning in this current sensing application?

I went through following app note, where OPA333 is used in 400V bus current sensing application, also i have seen current sensor which have term called common mode voltage, which is specify the max ...
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0answers
56 views

Controlling 120v line with a 12v switch on a different line

I have 10a 120v power sockets in my garage that currently doesn't have any switch on it and powers some overhead lights that I have plugged in. Separate to that, I have a 12v circuit powering various ...
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0answers
26 views

Sense capacitive change then apply high voltage

When an insect touches two of my wires the capacitance between them changes. This can be detected. Now after a change is detected i want to put high voltage on those two lines. I am afraid however ...
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1answer
60 views

High Voltage Half Bridge Drive

I am working on a project to produce high voltage output. Since I supply this circuit directly from mains I have some problems. Here is my representative circuit: I am controlling transistors from a ...
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1answer
56 views

Slayer exciter not working

My issue I have recently been looking at a circuit named a "slayer exciter". From what I have read it is a form of SSTC (solid state tesla coil). I found a good video about it on youtube ...
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0answers
57 views

Does silkscreen help with voltage creepage distance?

I have seen on various mains powersupply PCBs that they have a lot of silkscreen lines near the high voltage areas. So my question is that does the silkscreen helps rise the voltage rating of that ...
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1answer
124 views

How can a high voltage flyback transformer burn pieces of paper? [closed]

Why is it possible to burn pieces of paper by holding the output of a high-voltage flyback transformer near them? How is the circuit completed if there's no electrical connection between the paper and ...
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3answers
103 views

Voltage / current from Van De Graff generator vs. voltage / current from AC wall sockets in homes

The Van De Graff generator can generate voltages in the kV and MV range. I have read that if I touch the Van De Graff generator producing, say 50kV, with one hand (myself being insulated from ground ...
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0answers
42 views

High voltage power supply polarity for X-ray tube application

High voltage power supplies (HVPS) in the range 100 to 200 kV are used for working with X-ray tube. Some HVPS produce negative output voltage or even bipolar output including negative and positive ...
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2answers
46 views

When building a Tesla coil, is it possible to use the primary and secondary coils of a second transformer in place of the usual coils?

I am trying to build a Tesla coil. I have a neon sign transformer and a couple of microwave oven transformers. I am trying to understand why using the coils of an additional transformer to act as the ...
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2answers
53 views

Can you get 240 volts and 50 amps from paralleled inverter generators?

I'm here for help solving the problem of suppling a 240v, 45amp kiln off the grid. The catch is, we can't just use a large portable generator. So, -can you put three or more inverter generators in ...
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0answers
36 views

Rectifying a spark coil that produces 10 kHz

I am working on a project where I want 10 to 30 kV DC (to energize two capacitors in series rated at 28 kV per capacitor). I bought a couple of 25 kV HV rectifiers (one to generate a positive voltage ...
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0answers
35 views

Creating A High Voltage Power Supply

I am currently building my own high voltage power supply running off of a 10v input and a 360v output. The circuit will use a 555 timer switching at a frequency f that will drive a MOSFET to power a ...
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2answers
45 views

What is the maximum voltage that the circuit can withstand

Below is my circuit, ESD Capacitors Specifications : C0001, C0002, C0003, C0004 = 47nF, 100V, 10%, 0805 I have 2 basic questions : When a +4kV pulse & 330pF is applied, Does the 12.77V (Q=CV ; ...
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1answer
76 views

Can you turn on a light bulb using only one of the two wires of the wall outlet?

Instead of trying crazy things I would rather ask. I am asking this for purposes of learning. So I have learned that if the voltage is high you can get electrocuted by touching only one side of the ...
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2answers
68 views

Cockcroft walton multiplier output both AC and DC?

I was watching this video https://www.youtube.com/watch?v=ep3D_LC2UzU and I noticed that closer to the end he is probing the upper half of the circuit and the scope is displaying square waves , also ...
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3answers
166 views

My Coilgun Stage Driver Keeps Burning Out Mosfets. Any idea why?

Here's my stage driver circuit: The circuit worked as expected at around 100v. But at 330, both mosfets burned out at the first firing, and the entire cap bank discharged through the coil. I thought ...
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0answers
18 views

circuit design to output high voltage MHz high frequency [duplicate]

I'm trying to design a circuit that outputs 4.5 KV alternating between two nodes at about 4Mhz. What would be the most efficient way of doing this? I thought of using 4 4.5 KV rated transistors as in ...
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1answer
90 views

How can I convert a very high positive DC voltage to negative DC voltage

I have a high voltage power supply which can power up to 30 kV with respect to ground. However, for my experiment (something like the one used in photocopier machines) I need a high negative DC supply....
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5answers
5k views

Is it safe to touch 200 volts DC?

I was watching this YouTube video. The content maker simply declared that 200/300 volts DC is safe to touch. I think the capacitor used in that circuit is limiting the current. That's why nothing ...
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1answer
67 views

Cheap, compact 3.7VDC -> 400kVDC (continuous) converters

I recently bought some inexpensive and compact (about the size of a 18560 battery) 3.7VDC -> 400kVDC converters. I can confirm they work, and based on the breakdown voltage of air, estimate the output ...
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1answer
48 views

HV capacitor switch

I have in hand a 220V:600V isolated transformer and a HV bridge rectifier and I'd like to charge a 250uF capacitor with adjustable voltage from 200V to 500V. My idea is to use a switch between the ...
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3answers
135 views

370 V, 400 mA stablilized power supply with variable load

I need a power supply that can deliver stable 370 V DC voltage, while load resistance is variable. Average load current(assuming stable 370 V supply) is 200 mA, however it may rise to 400 mA. Input ...
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1answer
68 views

How can there be a zero sequence current in a single line to ground fault with an ungrounded neutral

The circuit that describes a single line to ground fault in a system with an ungrounded neutral is: I neglect capacitance between phases and only look at capacitance to ground. The definition of zero ...
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0answers
45 views

Why is an attenuator placed on the scope end and not the PCB end?

I've noticed when adding an external attenuator between PCB and the scope (1MOhm) that it is placed in this manner: PCB -> SMA Socket -> SMA Cable Plug -> SMA Attenuator -> SMA-to-BNC -> Scope Why ...

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