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.

Filter by
Sorted by
Tagged with
1
vote
1answer
85 views

How do we explain the voltage doubler operation by analogy?

The idea behind the Greinacher voltage doubler is so clear and intuitive that it can be explained, like any brilliant circuit idea, in a very simple way. I did it yesterday in a similar question where ...
1
vote
2answers
152 views

How does the voltage doubler work at the startup?

I have no particular interest in power electronics but I am always impressed by such clever circuit solutions as the Greinacher voltage doubler. The idea behind it is so clear and intuitive that it ...
1
vote
0answers
20 views

Does transformer line side voltage varies with backup generator on load side running at from 0 to 100%?

We have a transformer of 750 KVA with 5.75% impedance. On the load side we have loads and a back-up emergency generator. This emergency generator is capable of supplying the loads and still export ...
0
votes
0answers
66 views

Slayer exciter 2N3055 to 2N3716, what can explain these behaviours?

I built a slayer exciter with a 2N3055 from which I can pull 1.5" arcs at ~30V (tried base resistors ranging from 20-30kohm). I was planning to run it at a higher input voltage than the 2N3055 can ...
-1
votes
0answers
39 views

High voltage Mosfet driver stage

In the schematic above I designed a high voltage Mosfet driver stage with some bipolar transistors. The simulation worked so far so I decided to build the circuit. Frequency response is pretty bad ...
-1
votes
1answer
35 views

High Voltage Generation With PWM

I am trying to design 20W output power supply with about 1KV output with 20mA current. Designs I am working on are, 1: But with this configuration ampere comes from the 12V DC supply goes too high ...
1
vote
5answers
131 views

9 V to 360 V via boost converter?

So I'm fairly new to electronics and I wanted to make a boost converter. I was trying to get 360 V from 9 V and ran my circuit through LTSpice and EveryCircuit but it didn't seem to work. It's a ...
0
votes
0answers
10 views

Digital measurement of dissipation factor for HV transformers

I am reading some documents on how to calculate and measure the dissipation factor tor tan delta by using the digital measurement and here is the link. After reading first what is the dissipation ...
1
vote
3answers
114 views

Current leaks at 500 VDC

Background: I have a small soldered joint on a 500 VDC (0.1 A) lead that's exposed to air. The edges of the joint are fairly ridged and have a few significant edges. In the higher voltage range (40 kV)...
3
votes
2answers
80 views

Use of ceramic capacitors in HV system

When I opened the supply board to the detector (Geiger counter,) I got the above circuit. The detector uses a gas-filled tube with a central wire at high voltage to collect the ionization (charge) ...
2
votes
1answer
58 views

Measuring AC Current at High Voltages (up to 600VAC)

I've been looking at various ways to measure current for a while now, and am stumped on how to read high-side AC Current Measurements ohmically (no Hall Effect sensors). My initial thought was to use ...
1
vote
1answer
44 views

Finding the optimal voltage for a sealed transformer

I stumbled across a sealed transformer (step-up) which i believe came out of a neon power supply. Its completely covered in epoxy like goop and the internals cannot be seen. However,on the tin it ...
3
votes
2answers
61 views

Does the electron beam go towards the deflection plate with the higher, or the lower voltage?

So I've started tearing apart an old CRT scope to learn everything about them, and right now looking at the voltages on the deflection plates. When the trace goes down, my vertical plates read (a)193v,...
0
votes
2answers
94 views

Looking to generate 25 Hz square wave at about 90 V AC

I am looking to build a square signal generator tuned to ~25 Hz at a voltage of ~90 V AC that can output ~400 mA. I've searched around the internet and tried a few things but I've had no luck. My ...
1
vote
0answers
37 views

Proper implementation of creepage and clearance in high voltage PCB

I am designing a 3phase voltage detector based on optocouplers as shown below: simulate this circuit – Schematic created using CircuitLab For this I need to follow DIN 60664-1 and my biggest ...
2
votes
3answers
105 views

How to unground microwave transformer

I'm trying to make MOT tesla coil and would like to connect secondary coil in series. The low voltage end of secondary is connected to the body of the transformer. I don't particularly want to ...
-3
votes
2answers
142 views

I'm struggling finding everything I need to know to pick out a pot

I'm trying to make a color mixer with 3 potentiometers and a lightstrip. Each potentiometer will control a LED, one red, one green, and one blue. The voltage requirement for the strip is 5v I think, ...
0
votes
0answers
58 views

How does this electrical ballast need to be wired to the flyback transformer?

I just got myself a flyback transformer and an electrical ballast for fluorescent lamps as I heard those can be used together. The electrical ballast is supposed to generate a high frequency which ...
0
votes
1answer
59 views

Please help me with this diode identification - i can't find company name and datasheet

I have a problem with this part, can't find the datasheet and company name. The logo is very characteristic and I put it in the left corner. I would appreciate your help.
1
vote
1answer
129 views

Using Motor Oil as a Transformer Oil Substitute

I need a rather large volume of oil to insulate a few 15 kV wires/coils. Unfortunately, the volume of oil required puts transformer oil outside of my price range. I've noticed that others have ...
2
votes
3answers
76 views

Thin insulation for 400v plates?

In a design of mine, I need to place two plates on top of each other as close as possible. With a 400v potential difference possible between the plates, what is the best material that can be placed in ...
2
votes
1answer
90 views

How come distilled water hasn't replaced transformer oil as a high voltage insulator?

I've noticed that distilled water has an extremely high dielectric straight (65-70 MV/m). With that considered, how come it isn't used in the place of transformer oil for 10-20 kV applications where ...
0
votes
0answers
23 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 ...
-1
votes
1answer
90 views

Making an Inductor with Proper Inductance

Background I am planning to build a 0.0625 mH inductor, which will be sent about 15 kV max (10 uS pulses, 10 per second). The inductor will be made of 14 AWG copper wire in a tub of mineral oil. The ...
2
votes
1answer
69 views

Measuring high voltage with low power op amp

I want to use AD623 instrumentation op amp to measure current at high side of the circuit: simulate this circuit – Schematic created using CircuitLab I was thinking to use a voltage divider ...
0
votes
1answer
39 views

Current limiting in simple blocking oscillator HV generator circuit

Im planning to use a simple blocking oscillator with a CCFL transformer and Cockcroft-Walton diode multiplier to supply HV for a Geiger-Muller tube. This requires 1600V but at miniscule current. I ...
9
votes
5answers
2k views

Why are Marx Generators built like that?

Short introduction: A Marx Generator is a capacitor arrangement that transforms a DC input voltage of let's say 1 to 20 kV to a multiple of that. Capacitors get charged in parallel and when they ...
-1
votes
2answers
65 views

Tesla coil and marx generator

I've been building a Tesla coil. I wanted to use a 3kV 30mA neon sign transformer but the problem is the length of the arc is not enough for my taste. Because of that I wanted to use a Marx ...
1
vote
1answer
60 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 ...
4
votes
4answers
879 views

Scam or Legit: High Voltage Capacitor Manufacturing? [closed]

I have been looking for an 0805 10uF ceramic capacitor rated for 100v. Mouser and Digikey have only appalling prices for such specs (50 cents/piece at 5k for example). I recently made this shocking ...
1
vote
2answers
47 views

Explanation for Method of Monitoring Current from a Power Supply

I recently came across an interesting way to monitor current, but was not certain exactly how it works. Likewise, I was hoping that someone might be able to explain how the device measures current. ...
1
vote
1answer
58 views

High voltage and cheap differential amplifier

Can I use a LM324N (very common) op-amp to act as a high-side differential current sense op amp at high voltage? The Differential Amplifier The differential input voltage rating is 32v, but my load ...
1
vote
2answers
66 views

SMPS voltage feedback using op-amps

I'm designing an adjustable high-voltage low-current power supply using UC3843 control chip. Basic parameters: Uin = 24 V DC, Uout = 30-1000 V DC, Iout = 10 mA, Uripple < 1 V, fsw = 40 kHz I have ...
0
votes
0answers
59 views

Issue with high induced circulating current in 115kv underground line

We are facing a problem with high induced sheath current during line testing with cross bonding. Initially, we got 27 amperes in link boxes when we injected 70 amperes in the line. Later with a few ...
1
vote
2answers
56 views

Clearance of Exposed Nodes on High Voltage Relay

I'm trying to use this high voltage relay for a machine that will assist in HI-POT tests. The relay can handle about 10kVpeak according to the datasheet and I need it to handle 3.5kVrms maximum. I've ...
2
votes
1answer
114 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 ...
2
votes
2answers
112 views

High-Voltage Pulse Measurement Using Just Resistors for oscilloscope measurment

I would like to measure a High-Voltage pulse (20kV) with a duration of a few tens of nanoseconds using an oscilloscope and a simple 1000:1 Resistor Voltage divider. Is it possible to do this without ...
0
votes
0answers
69 views

Relay Switching MCU Hanging/Reset

I am working on samD21 MCU to control the 16 relays. I am also using a circuit to detect the input AC switch status On/OFF (Connected serially to the relays). This is connected through optocoupler ...
1
vote
1answer
85 views

Charging three individual capacitors with one AC power source

I'm trying to charge three capacitors by using my country's net voltage of 230V (60Hz) AC. The net voltage is connected to a diode bridge, which thereby results in approximately 325V DC. Each ...
2
votes
1answer
71 views

Measuring small currents at DC high voltages without floating meter

I'm doing a project with a Cockcroft-Walton multiplier that will output up to 40 kV DC at up to 10 mA. The the circuit takes an input of 10 kV AC at 60 mA and 60 Hz (from a neon sign transformer) and ...
-2
votes
1answer
141 views

Building a HV transformer

I built this circuit recently though it did not work for me https://www.instructables.com/id/Variable-voltage-ignition-coil-power-supply/ Using this coil https://www.autosurplus.com.au/brand/...
1
vote
1answer
76 views

What is the easiest way to get a 50x DC-DC voltage increase?

I want to have a 3-4 kV DC output to feed a marx generator in which I am planning to use 4kV ceramic capacitors. I have 2 DC power supplies @ 30V 6A rates, so I can have at most 60V DC input by using ...
0
votes
1answer
44 views

Power devices max voltage, current, power, speed, etc. .. ratings

I want to know how to get the real world or the most recent or the reliable information about power devices max ratings in volt, ampere, power, speed .. etc., parameters. I found this picture that is ...
1
vote
0answers
52 views

High Voltage shares ground, Problems?

I am having a problem with identifying why a high voltage part of my circuit broke the low voltage controller. To start, the basic premise of the circuit is to take a very accurate 0-10V DAC voltage(...
4
votes
3answers
241 views

How does current flow to the ground in Delta connection (Ungrounded) in an Earth Fault?

I'm an electrical engineering student and I'm currently in In-Plant training in Electricity Company of my country. Recently I visited an electrical grid. I got to know about Earthing transformer. I ...
1
vote
1answer
43 views

Separation of same layer traces

I've seen this capacitor: https://api.kemet.com/component-edge/download/datasheet/C0603C221JDGACAUTO.pdf It is a 0603 capacitor with a 1000VDC rating. As I am familiar with IPC2221, this did not ...
1
vote
1answer
65 views

Oscilloscope and Electrical Safety

I was reading an article in a magazine in which the following sentence is written about a circuit that generates a certain waveform on a load R (in which one of its terminals is connected to the earth ...
3
votes
5answers
149 views

High Power Variable Potential Divider

I have a DC high voltage (>270V) high current (>40A) circuit which needs to power a standard LED along the way to a heater. The LED is to indicate whether or not the heater is activated. I'm ...
2
votes
2answers
135 views

Voltage doubler and power

Lets consider for instance this voltage doubler: It was told that a practical limit of this circuit is the fact that we cannot absorb too much current from it. But I wanted to verify (if it is true) ...
1
vote
2answers
122 views

Why arc only happens when circuit on load?

I'm preparing research about high voltage electric distribution for my university but I don't understand why the arc only happen when current is flowing. I made my internship in an electric ...

1 2 3 4 5 15