Tagged Questions

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.

learn more… | top users | synonyms

8
votes
6answers
849 views

Can the wire of a high voltage power line be used as the primary coil of an air cored transformer? [duplicate]

Back in the 90's I heard this story of a guy who in the 70-80's lived remotely near the power lines and that he was very good in electrical engineering and that he had free electricity by using the ...
7
votes
3answers
148 views

High Voltage PCB Design

I want to design a 4 layer PCB with the following voltage levels. GND, 5V, 3.3V and 80V. In the circuit there are some MOSFETs which are driven by 3.3V and MOSFET switch 80V (required current is very ...
0
votes
0answers
29 views

Polaris 651 HV Probe

Can anyone tell me how to modify my Polaris 651 HV (40KV) Probe so that It can read both negative and positive high voltage? I do not have a manual, nor can I seem to find one. It is equipped with a ...
0
votes
2answers
84 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 ...
0
votes
1answer
73 views

24 volt on microprocessor input pin

I have got my hands on a Intel Edison system on chip. I would like to use it to detect non-zero voltage. For example I have a test point that could be either 0 volt or 24 volt and I want to detect ...
0
votes
1answer
75 views

Arduino controlling high voltage DC source, Opto-Isolator

I need to create a circuit that I can use an Arduino to control a 400~500 DC voltage source. I am not used to opto-isolators, but I was thinking about using it to separate both systems. But I cant ...
1
vote
0answers
72 views

Circuit for finding engine RPM using the magneto's coil ground wire

I'm looking to see if there's a solution without using a microcontroller to find the engine RPM (perhaps spark frequency is a better term?) using only the magneto's coil grounding wire. This wire ...
0
votes
0answers
28 views

high voltage chassis grounding [duplicate]

Suppose a high-voltage transformer has its chassis grounded, is it safe to touch the chassis? What if the HV terminal accidentally touched the chassis at point A @ 10kV, while the grounding is at ...
1
vote
1answer
84 views

high voltage safety [closed]

I remember having seen microwave ovens without the earth connection. My first question is : Is it correct that if you touch the MOT transformer chassis, but leave the other terminal floating in air ...
1
vote
0answers
47 views

Why does ignition coil have polarity markings?

I know about one reasonable answer to this. The electron emission is easier from a hotter surface, which in a spark plug happens to be the central electrode. So we should connect this electrode to be ...
0
votes
0answers
49 views

Driving multiple IGBTs with gate drive transformer

I am playing with a circuit I've been working on, which consists of a stack of 15 IGBTs connected in series. The end goal was to drive this "device" with a single toroid transformer, where the drive ...
0
votes
0answers
30 views

Multiple high voltage pulsers parallel protection

I’m working on a circuit right now for school, but I can’t seem to get it to work correctly. I have to high voltage (~4.5 kV, uA range) pulsers, that I want to use at the same time. The pulsers will ...
0
votes
2answers
72 views

High voltage distribution line fault current

On a conventional 7,200 volt distribution line, what would be the average fault current in a scenario like the one shown in the video below? Video Specifically, I'm wondering what the power ...
0
votes
2answers
108 views

Supercapacitors vs. High Voltage Capacitors with Inductive loads used in CoilGuns or Solenoids

I'm looking for some insight on whether an 1000 Farads at 2.7v or 5.5v would be more effective than say 10,000uF at 400v-450v when creating a strong magnetic coil. The intent is something similar to ...
2
votes
0answers
67 views

How to create a 120V-175V Variable Frequency Generator

I am dealing with a system that requires me to drive a capacitive load at 120V-175Vrms, AC square/sine wave at two frequencies: 50Hz and 2000 Hz @ Ipeak = 100mA. I am currently trying to find the best ...
0
votes
1answer
63 views

Selecting diodes for HV full bridge rectifier

I'm using a current-fed Royer self resonant circuit to generate 1kV DC output voltage. The transformer is producing a sine wave of 100kHz/2kVpp (Cap-Royer = 100nF). At the output of the transformer I ...
0
votes
1answer
77 views

Why is there heavy oscillation in my capacitor discharge circuit and is there anyway to fix it?

I have the following capacitor discharge circuit: simulate this circuit – Schematic created using CircuitLab When solving for the voltage across the primary and secondary inductors, I ...
0
votes
0answers
41 views

High voltage inverter transistor heating

I was able to get a HV supply that powers the back light of an old LCD monitor. I used it to light up the CFL bulb "directly hooking the HV terminals to bulb itself not to the 220V input of the CFL" ...
2
votes
2answers
98 views

Push-Pull driver for low side mosfet — is it a good idea?

I want to build an H-bridge to control a 36V dc motor (or possibly 48V but lets stick to 36V for now) The electronics that will control the H-Bridge (logic, etc) will run from a 12V ...
2
votes
1answer
53 views

Op Amp high voltage output

Is it possible to output voltages in the range of kilovolts and current of atleast >1mA using an input of <10V on a consumer electronics op amp such as IC 741? If not, then why?
3
votes
1answer
122 views

What are the bare minimum parts needed to operate a magnetron?

I recently took apart a microwave, and I managed to get a magnetron out of it, as well as a transformer that appears to be the power source for the magnetron, but looks a little small for the ...
0
votes
2answers
93 views

Opening MOSFET's gate with low voltage PWM

I have PWM of very low frequency and very low duty cycle. And max voltage comes out are 3.3. But thats not enough to open the MOSFET's gate(IRFP250N). Now I want to amplify the voltage. I do not have ...
1
vote
4answers
386 views

Tesla Coil Issue

I'm currently working on my first Tesla coil, and to my dissapointment, after completing it, the Coil does not function. I cannot figure out what went wrong. I have been told that an MOT wont produce ...
0
votes
2answers
224 views

Switching high current and high voltage for coilgun

I am building a multi-stage coilgun and need to be able to electrically switch 450V and over 100A somehow (virtually shorting large capacitor bank)... I've tried using IGBTs but fried them. I also ...
1
vote
2answers
89 views

How to wire DC kilovolt meter?

I recently picked up a small DC analog kilovolt meter. The scale went up to roughly 25kv.  I have some microwave oven transformers I would like to test the voltage.  I hooked a microwave diode in ...
2
votes
3answers
297 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
0answers
95 views

How can this isolated DC/DC converter claim a 3kv rating?

I'm referring to the Murata Power Solutions CME series DC/DC converters. Datasheet: http://www.murata-ps.com/data/power/ncl/kdc_cme.pdf If you look at the footprint of package (the -3C variant), ...
2
votes
1answer
56 views

Gas Discharge V-Q Lissajous

I've been investigating non-thermal plasmas, specifically dielectric barrier discharges, where two electrodes, at a potential difference of several kilovolts, are separated by a dielectric and a gas ...
4
votes
2answers
799 views

How does this mosquito zapper circuit work?

For the purpose of learning, I have tear down a small mosquito zapper racket. I am now trying to understand how the circuit is working (which goal is to produce high voltage). (yellow = ...
0
votes
2answers
192 views

Center-tapped Full Wave Bridge Rectifier

I'm designing a high-voltage power supply for a plasma experiment. I have a center-tapped ignition transformer (50:1) that I'm using to step up the voltage from 120VAC to 6kVAC and then using a full ...
-1
votes
1answer
174 views

What can cause the capacitor to blast? [closed]

I had a problem with my air conditioner. The technician came in and fixed it. But he told me that the capacitor inside it was blast. I want to know what causes this and how to avoid it. Thanks!
0
votes
3answers
293 views

High voltage power lines: helicoptor versus birds [duplicate]

As can be seen in this video, bringing a maintenance helicopter to the same potential as the high voltage power line is not without some arcing. Why doesn't that happen to birds?
0
votes
0answers
40 views

Current Return Path for Plasma Experiment

I'm planning to use an old non-GFI neon transformer to produce plasma for some research I'm conducting. However, the neon transformer is center-tapped which complicates diagnostics (such as ground ...
-4
votes
1answer
127 views

Bus bar calculation

I am trying to learn bus bar calculations steps . can someone help me how to get started for DC/AC bus bar calculation. how to get started?? what are the parameter need to be considered. 3.when skin ...
1
vote
3answers
239 views

Make 5kV, 0.001A (5W) step-up from 12V?

I have faced that problem: 9-15V Vin (12V accu) and 5kV, 0.001A out (5W) and dont know how to solve that, i tried to use push-pull SG3525 but efficiency is very poor, about 20-30%. Can someone suggest ...
1
vote
2answers
89 views

High voltage input window comparator

I'm trying to find pieces (comparators or op amp) to make a window voltage comparator. My window range is 180VDC to 230VDC. Did you ever heard of high voltage input comparators? I don't need a high ...
1
vote
1answer
101 views

Removing neon transformer center tap?

I have recently acquired an old neon transformer (rated 12kV) for conducting some low temperature plasma experiments. It is the mid-point grounded style with a center tap on the secondary coil. I had ...
1
vote
4answers
699 views

How can a faulty USB charger kill you?

This question relates to this incident here. Where a women in Australia died from a faulty USB charger that allowed the full 240v mains voltage through the USB cable. Now from my understanding you ...
0
votes
1answer
70 views

Question on capacitive circuit in practice

If we were to build a circuit, let's say with a power source of 120V AC going into a transformer which steps that up to 10kV @ 30mA, the output of which would be connected to a capacitor with a ...
1
vote
1answer
143 views

High voltage/current design on PCB

I am building a circuit that allows me to control a set of light (more specifically Christmas lights you see in supermarkets) with relays (AQH 2223). My idea is to have the controller input on one ...
-4
votes
1answer
43 views

Supply high power to mp3 device [closed]

i have an old mp3 device , by wrong i supplied a high volts to it through the battery place, Now it isn't work . By guessing . Which part of it's board has affected by this high power, to replace ...
0
votes
3answers
553 views

DC-DC step up from 3V to over 100V

I'm currently building a DC-DC step up circuit to step up 3V to 100V. I don't want to use transformer because i want to keep the circuit as small as possible. My thought is ... building a 30V-output ...
1
vote
1answer
115 views

High voltage measurement with an Arduino

I'm looking for a way to somehow measure voltages in the range of 60~90V with an arduino analog input. These voltages are biasing a rather sensitive APD exposed to very low light levels, which ...
1
vote
1answer
57 views

PWM photodiode bias circuit control voltage

Cant the photodiode bias regulator described here, Fig 6 be controlled with a PWM input? The RC loop right at the control input seems to filter PWM frequencies, but I am not sure if there are any more ...
1
vote
1answer
287 views

Can I run 2 transformers in series?

I need a 15kV or higher power supply. I found 2 used neon sign transformers rated at 10kv. Can I use both of them and connect the secondary coils in series to get 20kV? I am not sure if 15kV isn't ...
0
votes
1answer
156 views

Circuit building question

So I have been looking at building a circuit for a water-powered motor that I have been trying to develop. I plan on starting off with this battery. Then I will hook it up to this high voltage ...
0
votes
3answers
77 views

High voltage sealant coating

What would be the best way to electrically insulate the high voltage (60-90V) area on a PCB? I've seen a silicon-like coating on several PCBs, but I am not familiar with the product or its application ...
3
votes
1answer
447 views

Need a continuity LED for high voltage capacitive discharge rocket launcher

I'm designing a capacitive discharge rocket launcher. The reason for the cap discharge is to ignite a series of many devices at once. I did not want to switch the HV with the momentary pushbuttons ...
2
votes
2answers
118 views

High-voltage capacitors in space

I'm currently designing an high voltage DC/DC converter, from a linear technology app-note. My goal is to bias an avalanche photodiode with 200 to 300V, on a small educational satellite. I picked the ...
1
vote
3answers
209 views

Is there a maximum possible voltage?

This question got me to wondering if there is a maximum theoretical voltage. It seems to me there's a limit to how much positive or negative charge you could have--say, a container full of electrons ...