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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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26 views

Relay Switching MCU Hanging/Reset

I am working on samD21 MCU to control the 16 relays. I am also using a circuit to detect the input AC switch status On/OFF (Connected serially to the relays). This is connected through optocoupler ...
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0answers
54 views

Charging three individual capacitors with one AC power source

I'm trying to charge three capacitors by using my country's net voltage of 230V (60Hz) AC. The net voltage is connected to a diode bridge, which thereby results in approximately 325V DC. Each ...
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1answer
58 views

Measuring small currents at DC high voltages without floating meter

I'm doing a project with a Cockcroft-Walton multiplier that will output up to 40 kV DC at up to 10 mA. The the circuit takes an input of 10 kV AC at 60 mA and 60 Hz (from a neon sign transformer) and ...
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1answer
120 views

Building a HV transformer

I built this circuit recently though it did not work for me https://www.instructables.com/id/Variable-voltage-ignition-coil-power-supply/ Using this coil https://www.autosurplus.com.au/brand/...
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1answer
75 views

What is the easiest way to get a 50x DC-DC voltage increase?

I want to have a 3-4 kV DC output to feed a marx generator in which I am planning to use 4kV ceramic capacitors. I have 2 DC power supplies @ 30V 6A rates, so I can have at most 60V DC input by using ...
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1answer
39 views

Power devices max voltage, current, power, speed, etc. .. ratings

I want to know how to get the real world or the most recent or the reliable information about power devices max ratings in volt, ampere, power, speed .. etc., parameters. I found this picture that is ...
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0answers
48 views

High Voltage shares ground, Problems?

I am having a problem with identifying why a high voltage part of my circuit broke the low voltage controller. To start, the basic premise of the circuit is to take a very accurate 0-10V DAC voltage(...
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3answers
100 views

How does current flow to the ground in Delta connection (Ungrounded) in an Earth Fault?

I'm an electrical engineering student and I'm currently in In-Plant training in Electricity Company of my country. Recently I visited an electrical grid. I got to know about Earthing transformer. I ...
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1answer
40 views

Separation of same layer traces

I've seen this capacitor: https://api.kemet.com/component-edge/download/datasheet/C0603C221JDGACAUTO.pdf It is a 0603 capacitor with a 1000VDC rating. As I am familiar with IPC2221, this did not ...
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1answer
61 views

Oscilloscope and Electrical Safety

I was reading an article in a magazine in which the following sentence is written about a circuit that generates a certain waveform on a load R (in which one of its terminals is connected to the earth ...
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5answers
131 views

High Power Variable Potential Divider

I have a DC high voltage (>270V) high current (>40A) circuit which needs to power a standard LED along the way to a heater. The LED is to indicate whether or not the heater is activated. I'm ...
2
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2answers
104 views

Voltage doubler and power

Lets consider for instance this voltage doubler: It was told that a practical limit of this circuit is the fact that we cannot absorb too much current from it. But I wanted to verify (if it is true) ...
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2answers
109 views

Why arc only happens when circuit on load?

I'm preparing research about high voltage electric distribution for my university but I don't understand why the arc only happen when current is flowing. I made my internship in an electric ...
5
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2answers
1k views

1kV DC Circuit - Insulation on ground wire?

If I have a 1kV DC circuit, does the ground wire need to be rated for the full 1000V? The circuit is pretty simple, two wires from a power supply to a resistive load.
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3answers
111 views

Should you Megger test transformers?

I have heard people say you shouldn’t Megger test transformers because the high voltages used might cause insulation between windings and between windings and the core to breakdown. Is this true? ...
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0answers
30 views

How do I measure the fluctuation of a pulsed voltage of ~1700V?

The problem: See the little sketch. Starting from a high-precision DC power supply, I pass the voltage to low-pass filter and a pulser. This pulser pulses the nominal voltage of around ~1700V down to ...
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1answer
63 views

Voltage multiplier - selection of values

I'm designing a circuit, which includes a voltage multiplier. The schematics of voltage multiplier is well known, but it usually appears without any specific values for capacitors and diodes: My ...
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4answers
74 views

Capacitor Selection for high voltage

I have a circuit which has about 10 kilovolts input and I want to store that voltage on a capacitor. I calculated and drew the circuit but I am now using an 18 nano farad capacitor at the end. I ...
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1answer
116 views

High Voltage on PCBs: design and layout questions

I am designing a PCB that has high voltage (DC) on it. It will be located on a CubeSat (so, space). The PCB (HV-PCB) will receive the HV (3 kV max) from a DC-DC converter through a Coax cable; the ...
4
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1answer
106 views

Designing an analog high voltage multiplexer

I'm putting together a design for a vacuum tube tester and curve tracer. The circuit I want to build is capable of powering up a tube and measure the voltage and current at the tube's pins. I would ...
5
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3answers
116 views

Diodes in series to increase reverse voltage: why one need to add resistors?

Usually it is recommended to put resistors in parallel to each diode like this: It is supposed that the resistors will equalize leackage currents and make the voltage drop more even. However, I ...
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2answers
105 views

How to generate high voltage with inductor

I was tinkering with old camera circuits and I am amazed to find these can generate 400 V with 1.5 V battery. So how can I make such a circuit to generate and store high voltage? I searched about ...
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0answers
67 views

Lower amps than expected?

I build an inverter to power some panels of EL paint (If you don't know what EL paint is check out this link). It puts out some very high voltage and I thought I'd check to see what amperage it is ...
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1answer
107 views

What's best protection for a really high voltage 50kV generator PCB? [duplicate]

What is the best options for protecting a 50kV high voltage low amp PCB? Encapsulation the components, potting the whole thing or just using conformal coating will be enough for the corona discharge?
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0answers
93 views

Enclosure/boxes for high voltage PCB

It is time to choose the proper enclosure for a high voltage PCB. We will need to do holes for LV external connectors and external connectors for high voltage wires. I was looking for standard boxes ...
7
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1answer
291 views

How can I rectify up to 85 kV?

I've recently gotten into eletrochemistry, and I found out that if you break through \$\epsilon_{0}\$ with a high enough voltage you can ionize various gasses. I've already wound a 1:1250 EE core that ...
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1answer
166 views

500V generation, MOSFET Heating Problem

Referring to my previous post. I have successfully generated 500V. The problem I am facing an issue. MOSFET I am using for switching is FQB34N20LTM. The MOSFET is burning badly. The snap of drain ...
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1answer
34 views

Minimum distances between box case connectors and PCB surface conductors

I am working on a few kV PCB design with external voltage connectors (HIGH and GND levels). So user interface connectors are thought to be bananas jacks (they support until 7kV but has soldering ...
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2answers
109 views

Voltage Divider Multiplier Value Too High?

After constructing a voltage divider to reduce the voltage from my power supply (Output 10kV, 30mA) an oscilloscope probe was used in hopes of measuring the output voltage of the system. Due to the ...
1
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0answers
41 views

High quasi-isolated voltage measurement

I have to measure a DC voltage and an AC voltage around 100V. I found the circuit with an AD629 and one OP177. I simulated everything in Spice and it works fine, at least in the simulation. In ...
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0answers
86 views

How to know what is the safety standard to apply to a PCB design?

I want to design a PCB with some points at some KV during certain times, less than 10KV and no more than 30mA of current. After dealing with concepts and getting the main idea about my circuit needs, ...
2
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2answers
72 views

SOIC-8 IC input pins small spacing at high voltage

I'm looking at a high common mode voltage difference amp (AD629). The input voltage between the two input pins next to each other will be 150VDC. Normally the pads should be bigger on the PCB than the ...
5
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4answers
172 views

Removing output voltage ripple in high voltage outputs

I am looking to reduce the voltage ripple on a DC/DC converter operating at 5kV. I have looked extensively on the internet and have found multiple ways to reduce output voltage ripple, an ...
1
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2answers
154 views

Can single phase AC produce a continuous electric arc?

Constant DC supply and 3 phase AC (in mercury rectifier) can produce a continuous arc. But can single phase AC also produce a continuous arc? Because it is written on the web that arc extinguishes at ...
5
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1answer
69 views

Barrier and slot within reduced area on a PCB

Imagine this situation in a little area of your PCB: According to the worst case and used material, I need a creepage distance = 30mm. According some tables, clearance must be 30mm. First Red banana ...
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2answers
175 views

15kV High voltage pulse generator circuit how to have digital control?

first of all I'm fairly new to making a more complicated circuit. I'm trying to make a PCB with an ATmega328PB chip on it. And with that chip I want to control a High voltage pulse generator (Arc ...
4
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1answer
84 views

Why are overhead electric wires allowed to have higher voltages than third rails for rapid transit railways?

I hope this question is on-topic for this site. The city I live in (Chennai, in India) got a rapid transit metro rail a few years ago that uses overhead electrification of 25kV, 50Hz AC voltage to ...
2
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5answers
138 views

When to use slots instead of barriers in high voltage design?

I have read a lot of information about the clearance and creepage strategies, distances, materials, etc.. I am designing my first HV PCB, main LV circuit will be on TOP and HV (6KV) on the bottom. ...
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0answers
35 views

Neon Power Supply Voltage AC Measurement

So I was provided with a circuit which consists of a variable transformer connected to the main (essentially allows the input of the power supply to be controlled) and a Neon Power Supply (Has An ...
0
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0answers
51 views

High voltage output from CCFL backlight transformer?

I have an old television inverter board I've been meaning to turn into a power supply for a plate-deflected oscilloscope CRT *. I'm not really an expert on transformers, however, and though I have ...
0
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0answers
73 views

Oscilloscope high voltage and current measurements

I have been tasked with measuring both the voltage and current output of a plasma system but have only been provided and oscilloscope to do this (Tektonix TBS 2000 Series 100MHz, 1G/s) and a high ...
1
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0answers
31 views

Pulsed Power Charging Resistor and Choke

I am currently attempting to build a pulsed power supply that requires an 8 H inductor to produce 50 kV 17 A square pulses with widths of 100 uS. Please see the attached schematic for more details (...
0
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1answer
63 views

In high voltage but low current measurement [closed]

I made some research but couldn't find my answer which fit my question well. First of all, I am looking for circuit design or a brilliant idea that can be applied a high voltage(app. 40kV). For this ...
3
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1answer
65 views

High Voltage Planar Transformers

I am designing a high voltage DC/DC converter that is for an aerospace application and therefore I am focusing on reducing the size and weight, so switching at a high frequency possibly integrating ...
10
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3answers
834 views

Is kapton suitable for use as high voltage insulation?

I need to solder together some wires which will eventually run at about five kV, and I'm trying to figure out the best way to insulate the exposed leads. Heat shrink (my usual go-to) is apparently ...
1
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3answers
110 views

Measure 10kV with 600V rated multimeter [duplicate]

My multimeter is rated for 600V but I need to measure a 10kV AC source. I was thinking of building a voltage divider but I wouldn't know how many resistors it would take to safely measure this high of ...
0
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1answer
91 views

Supercapacitor based lightning-harvester [closed]

Could lightning discharges be harvested and stored in supercapacitor banks? Could supercapacitors withstand and collect lightning? Lightning usually lasts for about 10 micro seconds and reaches ...
1
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0answers
57 views

Standards for colour of conductors of pre-assembled cables

We are designing a product for industrial energy storage systems. Multiple units are connected with pre-fabricated cable assemblies of 2-4 separate leads that are terminated in connectors unique to ...
3
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5answers
102 views

Open circuit ground multiplexing?

I am experimenting with electrospray ionization. The setup has a 4kV power supply connected to an electrode that is separated from a return lug (or ground plate) via an air gap, followed by an inline ...
2
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2answers
87 views

High voltage op amp rail generation

I'm using two ADHV4702-1 high voltage op amps for a project. They are configured as a current sink with a class B output amplifier (with some fixes for the crossover distortion). I already have a +/-...