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
46 views

Protect 555 timer from high voltage

I built a circuit which I strapped one electrode to the bottom of my shoe, and the other to my leg. This circuit consists of a high voltage DC supply in my pocket driven by a 555 timer. When it works, ...
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2answers
83 views

Convert 6 volts dc to 300 volts dc

I am trying to build a portable Geiger-Mueller tube that is run on 4 AA batteries. However, the tube runs on 300 volts. What is the most efficient way to do this. I have looked for transformer that ...
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2answers
85 views

High voltage to TTL conversion

I'm designing a circuit that is going to sense the existence of high voltage DC(400V+) via microcontroller. I've already designed it for AC voltage using an optocoupler; however, I will not able to ...
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0answers
36 views

How can I experimentally determine the breakdown voltage of air using FEMM simulations

I have setup a rod-plane gap scenario in FEMM as shown here: and here:. I understand that the breakdown voltage of air is 3kV/mm and therefore have set my conductor to be at 4kV for the simulation. ...
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0answers
44 views

What would be some solutions to prevent system malfunction after IEC 61180 4 kV and 6 kV tests?

My team of engineers are developing an energy analyser that have to be submitted to the 6 kV transient tests of IEC 61180, Table 1 Line 8 and 4 kV fast transients tests, Table 1 Line 9. When we were ...
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1answer
78 views

Testing 4kv supply

I need to test if the trigger coil on my strobe circuit is working or not. But it has a 4kV output. How do I test such high voltages?
2
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1answer
152 views

Can multiple IGBTs share voltage?

I'm building a solid state tesla coil, which requires me to switch very high voltages at high speed to achieve resonance. The problem: I can't find any IGBTs that can switch the voltage I need. In ...
0
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1answer
69 views

Can 0V from an isolated source arc to earth ground?

I have a high voltage bus bar (~300-400VDC) that is powered by a variac. This sits in a case that has other electronics that are powered by a step down transformer (120VAC to 24VAC, then rectified to ...
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0answers
38 views

Switching 150kHz mains for an LC load

I'd like some input on whether or not to use a mechanical relay or some form of SCR setup to change the capacitance in my LC circuit that is currently operating at around 170V, 1A at 150kHz. (Not ...
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3answers
83 views

Why does this kit only support 24V

However this question may seem naive, it is still something that worries me. I bought this twilight relay kit (to turn on/off my home entrance light obviously). Thing is: The guide shows that it can ...
0
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1answer
51 views

How to detect if a high voltage fuse is blown

I have a 150A fuse on a 100A @ 400V nominal battery pack. There are 5 service relays and 2 isolation relays (one on each pole) in this battery pack. I'd like to make sure that none of these relays can ...
2
votes
2answers
103 views

What is the source of leakage current thru an isolation transformer?

I want to use my oscilloscope to check the cleanliness of the output a high-voltage power supply (electrophoresis type, up to 3000 volts DC). I built a 100:1 voltage divider (out of 2 resistors - ...
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0answers
67 views

What power supply topology should I use?

I need to design a power supply capable of providing a maximum of 1800V at 0.02mA. The input voltage ranges from 135 to 250V DC. What topology is recommended for this voltage? Flyback, buck?
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2answers
48 views

Negative Bias from Voltage Regulator

Can the voltage regulator from here, Figure 6 be used to supply a negative bias to an APD? Would inverting Vin/GND do the trick or could that damage the IC?
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4answers
194 views

What will happen to a transformer if rated output voltage is injected to the secondary terminal?

I believe that I have a three phase delta to single phase transformer 1Kva with input 415 v three phase and output 230 Vac single phase. ( Someone help me to identify what kind of transformer is ...
4
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0answers
2k views

Why DC is not used for long distance voltage transmission? (Tesla vs Edison 2015) [duplicate]

It seems this question has been marked duplicate but I believe the answers given here is much more in detail. Why we are still using AC voltage for long distance voltage transmission. As we know with ...
1
vote
4answers
92 views

DC/DC overvoltage problem

I am using a 12V to +-5V NMH1205DC converter. When I measure the output voltage without a load, it measures about +-8V. This converter will power a low current circuit that contains several OpAmps. ...
2
votes
1answer
247 views

Best Option for Charging a High Voltage Capacitor?

I was looking for a good option to charge my 450V 6800uF Electrolytic Capacitors. I initially followed the dc - dc booster path with a voltage divider comparator (op-amp) something similar to But ...
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2answers
91 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 ...
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2answers
98 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
34 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
votes
1answer
122 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 ...
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1answer
52 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 ...
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0answers
99 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
99 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 ...
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0answers
76 views

Simple way to design an electrical bug killer

I've been asked to design a device capable of killing bugs, like roaches. I have looked all over the Internet for circuit designs to no avail. I was hoping someone could tell me where I could find a ...
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6answers
1k 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
410 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
50 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
138 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
111 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
213 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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1answer
150 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
29 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
115 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
85 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
109 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
40 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
121 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
361 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
105 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
124 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
116 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
52 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
272 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
76 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
170 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
138 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
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4answers
713 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
594 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 ...