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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Trouble with an HY-5500 CRT -- HV supply not working
I just bought a ToteVision HY-5500 portable television from a thrift shop, and it's not working. When connected to the required 12V, from an adjustable power supply, it initially draws about 70mA, ...
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Will arcing occur if the two sources are isolated?
If I have two tracks on a PCB, that are 0.6mm apart, will the 230V arc across to the 3.3V PCB track?
The two supplies are isolated.
simulate this circuit – Schematic created using CircuitLab
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NST Tesla Coil Spark Gap Not Sustained [closed]
I'm currently building a Tesla coil using a 12kV, 30mA NST (from the late 80s I think) and a rotary spark gap in parallel with the output. I'm also using an MMC cap bank in series with the primary. I'...
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Thyristor T901N
The thyristor T901N in the Sinamics SL150 datasheet indicates constant operation limits based on temperature. In the datasheet, the continuous operation limits for this thyristor are as follows:
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What is this U-shaped device that seems to be connected to one leg of an overhead power line?
Seen recently in Boulder, Colorado.
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Capacitive-divider high-voltage adapter
I am reading a paper about the high voltage adapter. This paper uses the capacitive biasing method to make the transistors not be overstressed. VDVS seems to follow the VE. C1-CN-1 is used to divide ...
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Why would you ground your live terminal shunt resistor
I have seen some wiered things when taking the current measurement from a shunt resistor.
For instance the below circuit
simulate this circuit – Schematic created using CircuitLab
What is the ...
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How to calculate area using the V-Q Lissajous method
I am doing research on carbon conversion using the high voltage plasma method. In my research there is one problem, namely calculating the dissipation power where one of the parameters is determining ...
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Improving voltage follower circuit for high voltage pulse
What I’m doing:
I have some unknown resistive loads that I want to apply an exponential decay pulse to.
Regardless of the resistance of the load, I want to be able to specify the pulse peak voltage ...
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Can you check what's wrong with my connection? It's a high voltage module connected to battery and pushbutton
Please check what's wrong with my connection. I already tried to push the button, but it didn't produce any lighting spark.
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How to make a smart precharge circuit
I want to build a circuit that monitors the voltage at either end of the precharge resistor circuit.
Since the load will have capacitance, I should expect an RC time constant curve on the load of the ...
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Is there a way to do a high voltage insulation check on a wire without grounding it?
So far we are using a common HV tester to check the insulation (green) of a wire:
It has coal brushes (thin blue) at 1000 V, the wire core (orange) is PE. Short-circuit or leakage create a fault ...
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HV and LV transformer coupling not working, no current from LV transformer?
I am trying to couple a high voltage transformer (automobile coil) 220 V to 10 kV, with a low voltage home made transformer 220 V to 6, 12 V (think MOT but bigger).
I have tested/used the LV ...
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Flyback vs. Coupled inductors vs. Transformer?
So I am in the process of making a high voltage power supply and after a failed attempt at using a modified MOT and difficulties finding a flyback transformer, also difficulties understanding how they ...
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Why are high-voltage circuit breakers not automated? [closed]
I came across a video from Ontario Power Generation about them using a fancy Boston Dynamics robot to trip a high-voltage circuit breaker because it’s too dangerous to do it manually.
I was interested ...
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How to turn off charging while SCR is latching?
So I'm trying to make a CDI for my old motorcycle that can be controlled using Arduino, after a bit of research (mainly Googling) and prototyping I come up with this design, this design has been ...
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Power supply voltage divider incorrect output voltage
I am currently working on a high voltage (up to HVP-HVN = 2.5KV) power supply. I am having some huge issues in my actual output voltage vs expected output voltage of a voltage divider in my power ...
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What circuit allows me to drive positive kV level pulses to antennas and over spark gaps to earth ground?
Ideally I would like 0-6kV pulses with adjustable frequency, but I could settle for 4kV and 40kHz.
Pulses should be sharp as possible. Someone suggested a PWM module with a mosfet inside and to drive ...
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Protecting other circuits from Geiger power supply
I'm designing a Geiger counter power supply that boosts 3.3 V to 500 V.
The circuit is a basic voltage booster.
3.3 V power line is directly connected to inductor where high voltage is generated. How ...
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If a broken powerline touches the metal body of my car, can I touch any metal parts of my car while sitting inside of it?
Consider the following situation. I parked my car underneath some high-voltage lines – let’s say 380 kV-lines. Suddenly, one of the lines breaks in the middle due to a storm and one end of the (still ...
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Why don't we use the third harmonic in power transmission?
For some high power high voltage lines DC is used with the advantage that sinus wave AC obviously doesn't use the line to it's maximum capacity at all times. To correct this, we could use square wave ...
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N-channel as high side switch is always on
The end goal is to use an N-channel mosfet (SiS176LDN) to drive as strip of LEDs with a stack voltage drip of 20 V and run at 4 A, I chose this specific mosfet because it seemed to be logic driven. It ...
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Choosing capacitor value and rating and diode rating for Cockroft-Walton circuit
I am building a voltage multiplier Cockroft-Walton circuit that produces around 120 kV output voltage with 15 kV input voltage (initially 250 V is stepped up to 15 kV using transformer).
I have not ...
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What are these circular basket-like structures on a high voltage transformer's insulators?
Wikimedia commons contains this public-domain image of a high-voltage transformer of the Tarza power plant in Iraq, taken by Marvin Daniels in the U.S. Army:
There is much I do not immediately ...
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Protection of the power supply input from high voltage pulses
I am assembling a power supply for xenon arc lamps. I use a simple welding inverter as a stable current source. I use the presented scheme.
The ignition circuit generates pulses up to 25-30 kV for a ...
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Building Wehnelt power supply? High voltage DC in series with low voltage AC
I am trying to build a power supply in the following wehnelt/electron source configuration:
The high voltage power supply is a DC supply with maximum of 30 kV, milliampere current range.
The filament ...
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ADXL345BCCZ output problems in a high voltage, high magnetism environment
I'm trying to find a fault in an ADXL345 being used in a very specific application where it is near both high voltage and high magnetism. Is it known to suffer in this application? The circuit was ...
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Part guidance: Switching 120 VAC @ 3 kHz in < 5 ms
I want to control electroluminescent wire, which runs at 100 Volts AC @ 1000 to 3000 Hz, with a desired switching delay of under 5 ms. I have used Sparkfuns products in the past, but they are no ...
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LTspice not converging for modified Cockcroft-Walton circuit
I wanted to simulate modified Cockcroft-Walton circuit(shown in first figure). I simulated and got the results (as shown in the second figure). I made a hierarchical block to use repeatedly but ran ...
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Transformer turn ratio in DC-DC flyback converter for high voltage output
I have been for the past 3 months trying to design and experiment with topologies to charge a high voltage capacitor up to 1 kV. I have settled on a classic flyback topology:
I have tried several ...
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Simulating a multistage Cockcroft-Walton circuit in LTspice
I am trying to simulate a Cockcroft-Walton circuit in LTspice. I need an output of 15KV for an amplitude of 12V 50Hz AC supply. I got as expected 24V output after the first stage and cascading I am ...
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Manufacturing precautions for voltage multipliers [closed]
I've been watching YouTube: https://youtu.be/YYKlfFYTl-8. Can you tell me is this dangerous or not to do at home?
So I've been watching this video, and I've wanted to do it myself, but to the number ...
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Will this scenario trip the GFCI?
An inline GFCI rated at 15A 120VAC with 4-6mA trip level is used to provide 120VAC to an AC-DC converter. The converter outputs +12VDC with max 1A current. This is then used to power a high voltage DC-...
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How to prevent interference between high voltage and brushless dc motors
I am a DIYer without much experience in electronics or electrical. I have a device that has 6 DC brushless motors spinning discs around a cube with plasma inside. The motors are were bought at ...
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Why need voltage doubler when transformer can be made for full voltage
I have seen old vintage tube power supply (for example Heath HP-23A), that transformer secondary is roughly 300v RMS and a voltage doubler is used at output to obtain 750+ V DC for vacuum tube anode. ...
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How to put a decent snubber to the MOSFET?
I am trying to make a soft starter for an inverter to make the turn on process as a yield curve like the one in the photo:
so I used this circuit :
however, the problem is still visible in the turning ...
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ZVS driver not oscillating - powersupply
I'm using a ZVS driver to create a spark for a plasma speaker. The circuit above is the one I'm using for my project however I have run into some issues whihc I do not understand. First of all the ...
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How do I make this circuit work without using mosfets?
I've come across circuits that utilize MOSFETs to drive a center-tapped transformer, but unfortunately, I don't have any MOSFETs on hand. Since I'm working on a circuit for a Geiger-Muller tube, I don'...
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Possible downstream dangers of common 5Vdc power supplies
Let's say you have a 5Vdc/2A power supply that is hooked to some kind of power transformer or DC/AC converter that generates 120V+. The example I am thinking of is a nixie clock device that is powered ...
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How do I modify my flyback transformer to output 5kV?
I was wondering how to modify this circuit to end up with a 5kV power supply. I watched a Video by the Plasma Channel on YouTube on a similar design but it outputs 15-20kV which is too high for my use....
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SBM-20 Geiger-Muller tube constantly on
I have recently purchased an SBM-20 Soviet Geiger-Muller Tube, which I want to use in a Geiger Counter circuit. I powered it with a 12V to 400V DC-DC power supply, connected in series with a 5.6 ...
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How do I triple the output voltage of a 555 timer boost circuit?
I currently have an output of 160V, but my application requires a minimum of 400V-500V. Is there a method to triple the existing 160V to achieve the desired voltage range of 400V-500V?
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What is the alternative for a capacitive power supply? [closed]
I am trying to make a UPS, which will need to pass safety regulations. I need to detect:
When the mains AC voltage is present
When the mains AC voltage is under/over voltage
I thought of using a ...
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Grounding Circuit with two Power Supplies Wired Together
I am trying to operate an x-ray tube that requires a high-voltage supply and a lower-voltage filament supply.
The high voltage supply consists of a Cockcroft–Walton voltage multiplier, and the ...
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What is the best way to apply 0.1 kV- 5kV difference between two plates?
I want an electric field to act on ions in solution so I don't expect much work to be done. I need the voltage to be maintained over a 24h period and be adjustable between 0.1kV and 5kV.
Any help is ...
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Arc jumping from high resistance to low resistance path
Trying to make sense of how to cut current on a high-voltage system without turning everything into plasma.
Specifically, I'm wondering whether you could reduce the current by going gradually (but ...
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How are high voltage battery banks charged in state of the art applications? [closed]
It seems that a lot of battery banks, whether SLA or Li-Ion are setup in series to get high voltages, sometimes higher than the telco industry standard of 48V (which charges at 56V.)
A high voltage ...
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What safety measures should I take during a high voltage test?
I am planning to do a test with 800 V DC system in the lab. I have taken the high voltage safety training but it's my first time working with high voltage so I want to make sure that I am taking all ...
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Busbar short circuit rating vs. cubicle rating
First: This question is about medium and high voltage switchgear, not electronics.
A 7,2 kV switchgear has a short circuit current rating of Ik = 40kA/3 s. The ...
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Shielded -vs- Non-Shielded, running CAN Data Cable w/ 115/200VAC 3-Phase @ 400Hz
*Edited, AGAIN, in an attempt to remove any confusion
Settle this debate!
I am designing a Harness for testing the functionality of a PDU (Power Drive Unit), operated using CAN (ARINC-825). Prior to ...
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