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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2answers
77 views

Modifying HV supply for digital control

I've built the HV supply shown above (from here http://desmith.net/NMdS/Electronics/NixiePSU.html). And it works great. I would now like to be able to digitally control the output voltage. This is ...
0
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1answer
63 views

No output from Transimpedance Amplifier

I'm trying to set up a transimpedance amplifier reading the response from an avalanche photodiode (Hamamatsu S12572-100P http://www.hamamatsu.com/resources/pdf/ssd/s12572-025_etc_kapd1043e03.pdf) and ...
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0answers
27 views

high voltage carrier for 12 volt charge - any thoughts?

I've got one for you folks, which I can't seem to find any info on. what is the effect of high voltage AC (say 2kv), low current, on a 12 volt lead acid battery? Danger of the spark igniting the ...
2
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1answer
27 views

High Power H-Bridge with IR2125 Drivers Problem

I'm currently stuck on a problem when trying to drive a 140V DC motor using an H-Bridge with 4 high-power mosfets and 4 IR2125 drivers. I'm using as input to the drivers a signal generator of 5V in ...
1
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1answer
28 views

Voltage stepping and current reduction

I'm designing a drone to use a relatively new form of propulsion, electrostatic fluid propulsion, which requires extremely large voltages (in the order of 10-100kV) running through a wire to ionize ...
0
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0answers
49 views

APD bias discrepancy

I've built a PCB based on the voltage regulator design proposed here, Figure 6, which supposedly should result in a 30-90V output. However, the maximum output bias I measure is about 48V, which is ...
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0answers
35 views

Driving high voltage MOSFET H-bridge

I am looking for suggestions on MOSFET transistors and logic for driving high voltage full H-bridge from a 5V PWM signal. I have a microcontroller that outputs a PWM signal 0V->5V. And with this ...
8
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6answers
938 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
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3answers
176 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 ...
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0answers
30 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
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2answers
94 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
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1answer
75 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
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1answer
97 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
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0answers
83 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
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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
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1answer
89 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
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0answers
53 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
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0answers
65 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
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0answers
32 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
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1answer
92 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
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2answers
140 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
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0answers
77 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
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1answer
73 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
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1answer
83 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
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0answers
43 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
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2answers
116 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
58 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
129 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
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2answers
102 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 ...
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4answers
424 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
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2answers
274 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
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2answers
101 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
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3answers
338 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 ...
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0answers
108 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
66 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 ...
5
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2answers
1k 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
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2answers
227 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
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1answer
184 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
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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?
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0answers
42 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
134 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
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3answers
268 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
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2answers
96 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
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1answer
107 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
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4answers
792 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
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1answer
72 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
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1answer
156 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 ...
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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
715 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
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1answer
121 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 ...