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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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How did the people inside the train survive High voltage [on hold]

Hi I have a doubt regarding high voltage AC (25000volts) that is used to power trains and other heavy equipments . I saw a video in which a person climbs on top of a train and holds the power line (...
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1answer
26 views

Is it a routed slot the same than creepage concept and how to calculate slot width?

I was reading a high voltage pcb design guide and it talks about insulators insertions, routed slots, gradient rings, etc.. but it doesn't talk about creepage. As the creepage could be achieved by ...
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1answer
66 views

crossing 240 V traces on both top and bottom sides of a 2 layer PCB

My situation is the same as the crossings encircled in white from Can I place 220V Live traces on top and bottom of PCB? Therefore, running Line traces on the top layer and Neutral traces on the ...
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75 views

100V/36A Power Supply [closed]

Good day, I need a method to lower the mains voltage from 230Vac to 100 or 110Vac. I want a circuit that does not need a transformer to achieve such a result i.e. to lower the voltage to 110vac and ...
4
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1answer
70 views

Safe way to reform high-voltage capacitor

This week I received an old photographic studio flash unit made in the early 1960'ies. Inside is a huge 40µF/2500V capacitor. I don't know the usage history of the unit; it may not have been used for ...
3
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2answers
92 views

Minimum distance between two connectors in a high voltage PCB design

My application will have low current (mA) but high voltage lines. High voltage will arriving from external source using banana jacks on the case. I am looking for an example in which someone uses ...
3
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1answer
129 views

The life of a high voltage line

In my neighbourhood, a 220 kiloVolt high voltage line is being renovated. It seems that they are replacing the cables, and they also may do some other maintenance. This, however, gave rise to some (...
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45 views

What capacitor to use for high voltage & high current filter application

I am designing a filter that needs a capacitor. I am not allowed to paste the schematic here, so only the maximum voltage at and current through the cap, pasted from the spice simulation: (voltage is ...
2
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1answer
157 views

How to measure high DC voltage by micro-controller with an integrated approach?

Goal is to measure DC voltages in the 100-500VDC range, safely with a microcontroller (e.g. Arduino) The particular application is to monitor the voltage of a large Lithium series parallel battery ...
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0answers
31 views

How to calculate distance between two wire-pcb connectors with high voltage for keeping connectors isolation?

I'm planning the way of connecting 8 devices terminal wires all together within a 6kV point (V+), there will be 8 more wires connected to GND (V-). Those V+ and V- points will be in the metal case. ...
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1answer
55 views

safety precautions of high tension wire during rainy season? [closed]

Hi what are the safety precautions of high tension wire during rainy season? what is the precaution need to do, if the wire get cut and fallen in the road?
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2answers
64 views

X Ray Transformer with Full Wave Rectifier Design

I current am in possession of a center tapped X-ray transformer that can supply 80 kV and 10 mA. However, I need this transformer to supply approximately 0 to -37 kV DC at around 8 mA. In order to ...
2
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1answer
58 views

Electrode shape in a triggered spark gap?

I was reading about spark gaps which are triggered with a third electrode, and I think that the concept is pretty straightforward, but the resource described the usage of a third electrode which would ...
3
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1answer
112 views

How to join and connect two wires in one connector point professionaly in a high voltage PCB?

Regarding a HV (6KV) PCB design there is a part of the circuitry related to reed relay connection. I have chosen a HV relay (datasheet) with flying lead connection in order to separate physically LV ...
2
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1answer
27 views

Transformer Sizing with Mixed Loads (Three-Phase & Single-Phase)

I am trying to size/validate the rating on the medium voltage main transformer for an industrial plant. For some reason I can't find many resources that indicate how to properly do this when you have ...
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46 views

“Solder PCB” or “Flying Lead” high voltage connection for a reed relay model?

I'm searching for the HV reed relay solution for channels multiplexing printed board design: V < 6KV, I < 10mA. 8 relays that connect 8 input pins to V or GND (given for an external supply ...
2
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1answer
60 views

Are large pulsed currents the most deadly type of electric shock?

As opposed to sustained electric shock via DC or AC? I might be wrong, but when people are killed by electrocution it is usually due to a large current of very short duration passing through their ...
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0answers
20 views

How to use a singe transformer with the same effect as 2 in series

For a small project, I would like to know if it is possible to use a singe transformer, and a capacitor to effectively step up the voltage twice, E.g. Two of the same in series. If so, please explain ...
2
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1answer
39 views

how to isolate coupled noise source in parasitic capacitance in high voltage pcb design?

I'm new designing a high/medium voltage (V <=10kV) with low voltage and low current (10mA). There will be only a few HV relays. Their coils will be triggered by LV. I have read some literature ...
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4answers
2k views

How can I safely determine the output voltage and current of a transformer?

So I am building a Tesla coil with my partner for a senior design project. We safely ripped out a transformer from a microwave oven. However, after a good amount of research, we were unable to find ...
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1answer
88 views

Handling Hi voltage and very low current (10 mA) will need to prevent arc and corona effects on my PCB?

I' m following this guide; concretelly 3 and 4 chapters for High Voltage (HV) PCB design: https://www.magazines007.com/pdf/High-Voltage-PCDesign.pdf The fact is that I have read interesting ways to ...
2
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1answer
84 views

Looking for a 15kV Zener - or equivalent circuitry

I have a high frequency high voltage module that puts out about 15kV (not the stun gun modules sold on eBay). Because of the circuit design the transformer is damaged if it does not arc over. I am ...
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2answers
62 views

Looking for reed relays for high voltage commutation

I need to chose a reed relay for connecting a point to high voltage (probably between 7000V:15000V) or to GND signals. System will have 8 channels (pins). Some of 8 pins will be connected to high ...
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2answers
49 views

Does a thyristor experience loss if it is switched at zero volts?

I have developed a circuit that uses a capacitor's voltage to reverse bias a thyristor. The voltage to reverse bias it is only about 10% of its off-state blocking voltage. I am confused how I ...
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0answers
106 views

Discharging high voltage and capacitance capacitor?

I need to discharge a 4.4mF (millifarads) capacitor storing 1200V in about 5 seconds. I did the t=R*C' and got a resistance value of approximately 227ohms. I did a ...
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2answers
107 views

Why do we still use high voltage at home (on sockets) in the 21st century? [duplicate]

Just wondering, most of all equipment at home have components/circuitry inside to transform high voltage (AC) into lower voltage (mostly DC), also all modern LED lambs. Modern products become more and ...
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2answers
85 views

Why is 100 volts or less generally “low voltage” and “safe”? [closed]

In the United States in many state jurisdictions, wiring that operates either exactly at or below 100 volts is not required to be installed by a licensed electrician, and no site plan, building permit,...
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1answer
69 views

Limiting current draw from a power supply

I have a power supply that can supply around -60 kV DC and 10 mA. This power supply provides energy to a device known as a fusor. A fusor utilizes a low current and a high voltage to ionize a gas and ...
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1answer
86 views

How to convert 220 VDC to 24 VDC

I’m working on a project where I need to build a converter/power supply for converting 220 VDC to 24 VDC. Yes, its 220 VDC not AC. This convertor will be mounted on a locomotive type vehicle ...
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1answer
30 views

Routing a HV pulse across a number of channels

I have a number N of loads ranging between 3 and 16 (In the schematic I only draw 3 to avoid bloat) that requires well-timed high voltage pulses. The pulses have a width of 20~50 us and a period of ...
2
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2answers
87 views

Crockcroft-Walton Voltage Multiplier Large Voltage Loss

I have a CW voltage multiplier that uses 30kV, 1nF capacitors and doubled 20kV, 5mA, 100ns diodes (for a total of 40kV). My ac source is a sine wave (viewed on the primary side of the transformer ...
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0answers
40 views

Regulate ~350V spikes (duration nanoseconds) to logical level 5Volts

Use standard 5.1Volt zenerdiode? Can I trust that with zener diode it wont leak over 5 volts, concerning fast raising high voltage spikes. How about resistor sizing, the input goes to Arduino ...
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0answers
29 views

Switching between high voltage power sources [duplicate]

I need to get an LED to switch on once the voltage across a capacitor goes above 40V. It must then remain on from 40V to the maximum voltage reached by the capacitor which is currently 1200V. The ...
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1answer
34 views

Interference from well pump pressure switch and microcontroller

I am using the Parallax Propeller to start and stop timers for an auto racing timing system. Out of 250 cars there were timing issues with about 10 or so. It was very random and hard to diagnose. I ...
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3answers
880 views

Can I connect a DC high voltage booster directly to my Raspberry Pi? [closed]

I have one of these modules: Is it safe to connect it to two pins to my Raspberry Pi, directly, and turn it on by emitting HIGH on one of the pins (the other ...
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0answers
44 views

High voltage pulse discharge ring dampening (how to save a pulse capacitor)

So I have a high voltage pulse circuit. I have planned it to be around 90kv with the capacitor being 1.3uF. It is to be discharged through a spark gap. Before I test it, I of course want to save the ...
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4answers
925 views

High voltage LED indicator 40-1000 VDC without additional power supply

I would like to make an indicator to show that DC bus (700VDC) capacitors are charged (be careful!). What is the best way to make a LED indicator, which will work for a long time from 40VDC to ...
2
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1answer
145 views

500v generation with 24V, request for current limitation

I am generating 500V from a 24V source. Attaching schematics. This circuit is generating stable 500V. I am attaching a load of 7 kohm. In the schematics the buck regulator is supplying 19V to the ...
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0answers
64 views

500v generation with 24V

I want to generate 500V @100mA from a source of 24V @2.4A. My question is that would it be possible to maintain this current? Any clues please.
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1answer
61 views

Switching 1875 Volts through a relay

I am trying to create an electroadhesive device that I can switch on and off easily, however, after using one relay that worked beautifully to do this function, I went out and bought a 4 channel relay ...
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0answers
35 views

Should I add a DC link capacitor between HV battery and buck DCDC converter?

My application does not require an Inverter. If i don't need the capacitor,is it still better to add a resistor to drain any other system capacitance voltage?
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1answer
82 views

High voltage and current

I have a DC motor that needs and works nearly 400v and 20A. I chose FDL100N50 for n-channel mosfet also IXTK40P50P for p-channel mosfet. I connect a 4n35 optocupler for output of every mosfet. Are ...
2
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1answer
99 views

Transformer Insulation - High Voltage can Jump Through Ferrite Core?

First of all, I really searched the topic on both EE.SE and Internet but could find nothing. If this is asked before, please forgive me. As I stated here earlier, I was working on an HV amplifier. ...
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1answer
102 views

Isolated High Voltage Amplifier Idea

Test laboratory of our factory asked me to design an isolated high voltage amplifier. Here are the requirements: The circuit will be built with transistors and passive components in the lab. (No IC ...
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0answers
21 views

Under what conditions does a VSC require a DC-link capacitor?

For basic, conventional converters, such as the three-phase two- and three-level converters, the use of a DC-link capacitor makes sense to me. Considering only reactive power applications, it makes ...
3
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3answers
62 views

High voltage dielectric breakdown & layering insulators

I’m going to use 230 kV as the reference voltage for the example below; I know if I put a piece of metal too close to a 230 kV source it will breakdown the air and jump to the piece of metal causing ...
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3answers
82 views

How to measure voltage of each bank in a Marx Generator?

If I have a 10 stage Marx generator with each stage at 2.5kV, when I erect all the stages the last stage's negative terminal will be at 22.5kV with respect to ground. If I want a voltage ...
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2answers
52 views

Creepage on SMT DIP package with an NC pin

I'm having trouble understanding how the CPC1972GSTR can have the specs it does. Here's the datasheet. In particular, it has a blocking voltage spec of 800V, but if you look at the recommended ...
2
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1answer
273 views

Why is parking not allowed under some overhead power lines? [closed]

At work, among others, we have overhead power lines for the main grid connection (400 kV, about 1600 MW). The power lines cross a parking lot, and the positions directly under the power lines are ...
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2answers
195 views

Controlling high voltage devices with Arduino Relay module

Goal: I want to build a circuit that converts 700V DC supply to 700V pulses of 15ms duration. From what I have learnt from online, is that Arduino controller can be used with Relay module to control ...