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 precise is a DVM input impedance for high-Z circuit measurements?
I'm building a resistive probe using four 10 megaohms resistors to measure the output of a high impedance (> 2Meg)/high voltage bias supply without loading it too much. The idea is that the jury-...
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High Voltage Shock Safety in Electroadhesion
I am working on an electroadhesive for a project this year, and I need to find some sources that I can cite for the safety of the high voltages involved.
The high voltage converter that I was going to ...
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Feasibility of using LV Split-Core CTs on 6.6 kV Insulated Cables
I have successfully deployed a low-cost, high-accuracy condition-based maintenance system for low-voltage (LV) motors. The system uses split-core CTs and an STM32-based ADC to capture three-phase ...
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BJT breakdown voltage VCEV vs VCEO and modes of operation
For my application I need to use a FMMT459 (see the attached table). Its breakdown Vce with open base is 450 V, while its VCEV is 500 V. Am I assuming correctly that VCEV is the breakdown voltage with ...
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Creating a boost circuit, 24 to 200 V for a solenoid
I am building a boost circuit which should boost from 24 V to 200 V to fire a solenoid to kick a ball. I have found the parts and put together the schematic and want to know of this would work and if ...
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ZVS + Flyback Topology Capacitor Charger not working
For a project I'm working on, I have to charge a 2000 uF electrolytic capacitor bank to 2 kV. I have them mounted in a suitcase, so the design needs to be portable, so as my power source to the ...
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Understanding the behavior of a voltage-multiplied flyback converter
I'm working on building a low-current high-voltage power supply to run some smaller CRT tubes. The goal of this power supply is 2KV @ 3mA maximum, with a normal load <1mA.
I've made a voltage-...
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High Voltage PCB for Electromagnetic accelerator / Coil-gun
I've been working on a coilgun/electromagnetic accelerator/Gauss cannon for the past few weeks, and I'm having serious trouble building a real physical circuit to test my coils. I'm charging the ...
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Should I use tracks or copper pour for mains line connection between two points?
I am designing a relay PCB for an application rated upto 16A. The space is a constraint for me so for better connection, I used a copper pour for the line on the top layer and neutral on the bottom ...
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How to prevent arcing between planar PCB transformer HV trace and ferrite core?
I’ve been running into an insulation issue with a planar PCB step-up transformer (500 V to 5 kV). Around 1 kV, I’m seeing arcing between the ferrite core and the closest high-voltage trace.
So far, ...
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Making dual power supply for OPA454
I need to build a dual power supply for my opamp, and it needs to reach up to +-50V. I have thought of using one of my projects in class that can boost 9V-400V, decrease it down to 100V, and combine ...
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Spark danger in boost converter
I created a boost converter as given here:
Boost converter transistor voltage weird behavior
I do not know what happened but as I connected a smaller capacitor about 22 pF at the output in parallel ...
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MOSFET High Side High Voltage Droop
EDIT: My prior question was resolved due to using standard scope probes and not differential probes. It was all about measurement issues. This question is based on the same circuit, but about ...
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Can a high-voltage spike damage an oscilloscope when using a ×100 probe?
I have a Rigol 1202ZE oscilloscope and a ×100 passive probe (HANTEK T3100). The probe is rated for 2 kV maximum at the tip.
If a transient spike exceeds 2 kV (eg inductor kickback), will it damage the ...
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Power distribution for a tethered, daisy-chained drone (proof of concept, ≤100 ft): ground HVDC vs onboard AC-DC, and how to pass power downstream? [closed]
I am working on a proof-of-concept for a tethered drone that only needs vertical lift to about 100 ft. The drone has two counter-rotating motors. Together, the motors consume about 1.75 kW, and with ...
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Why is there a random Input-offset error on my ADC that changes when I touch it and remove capacitors?
I have a hardware offset voltage at the input of my AMC131M01DFMR when HV+ and HV- are shorted. I would like to know how I can model it because it’s being quite erratic.
The circuit is relatively ...
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What is the maximum potential difference between two isolated circuits?
My question is regarding the theory behind the difference in potential between two isolated circuits - both floating relative to earth. This is particularly relevant in HV applications, to prevent ...
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High Voltage H-Bridge "dip" on switch
I have designed a full bridge that handles +/- 2000V. It seems to work fine, however I am getting a voltage dip after the switch. The voltage reaches the setpoint fine, but then dips a couple ...
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15kV arc igniter improvement
So I have that cheap diy kit "15kV arc igniter", a smaller version like on the picture. I want to use it for igniting gas stove. I noticed that on the board where diode should be it says &...
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How does the firing of a spark gap in a Tesla coil convert the open primary circuit to an LC oscillator?
According to my understanding, in this type of design, when the spark gap fires, the circuit closes and the primary circuit should act as an LC oscillator.
However, the ends of the primary capacitor ...
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Exceeding Contact Rating for Rotary/Toggle Switches
The circuit I am designing will be using a voltmeter to test different high-AC voltages (<500VAC), and I would like to use some configuration of toggle switches and rotary switches to select the ...
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Voltage converter circuits from 5 to 170 volts
Recently I start my new project about portable Retro-clocks on vacuum-tube indicators "IN-16". But, I come across with a problem, where I need to convert my supply voltage 5 V to 170 V with ...
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Using this mini welder for arcing for DIY Emission Spectrometry
I'm a chemist with a keen eye for spectoscopy/spectrometry and have several suitable machines.
I've been using alcohol/gas/gas discharge tubes flames for excitation but am looking for higher ...
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Why are there some HV substations without voltage transformer on incoming feeders?
It is almost obvious the need for voltage transformers in a high voltage substation for measurement and protection, but a substation that interconnects 2 systems, one of 57.5 KV and another of 115 KV, ...
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How do I figure out the outputs of a High Voltage generator (up to 11kV)
I am working on a electro adhesion project that requires me to use a HV generator that can output up to 11kV DC. But the details of the input/output voltages are unclear and I am not even sure it can ...
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Why use a 1000:1 transformer instead cascading three 10:1 transformers?
I was researching different ways to make a high voltage DC-DC power supply in the 20 kV ~ 30 kV range, with output of a few tens of micro amps. The purpose is for testing isolation and resistance to ...
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How to test rated operating voltage of an inductor?
I am purchasing inductors for ±200 V applications to build filters. However, most inductors do not show rated voltage. Thus, I was wondering, is there a method to test the rated operating voltage of ...
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Why does the depletion layer of a cable reduce thermal and mechanical strain?
Inside a cable, which transfers power at medium-high voltages (>1 kV), between the insulation and the conductors there is a semiconducting depletion layer: this layer closes any gaps in between the ...
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Precharging using a PSFB Converter [closed]
I recently found an application in EV of Pre-charging from 12/24 V to 800 V using a PSFB DC-DC converter with reverse power flow (boost-mode). I needed help in getting clarity about some general ...
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Differential reading of shunt resistance measurement in High Voltage
I'm currently trying to read the current drawn by a sensor (a cold cathode gauge) that is supplied with a High Voltage (1kV up to 4 kV) DC supply. The sensor draws very small currents in the order of ...
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What is the difference between line and phase voltage?
In a three phase system, I’ve heard line voltage described as the RMS of the voltage difference between two lines coming from the power source and phase voltage is RMS voltage of a particular line ...
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Do apartment buildings with 3 phase power deliver 3 phases to each apartment or only single phase or something else?
Background
Edit: Good call out in comment. I am in the USA, CA specifically, but deployment will be across the USA. Most wall power in houses is 120Vrms/60Hz.
I am designing a product that connects to ...
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HV Electrical Insulation/Electrical Insulation Testing Symbol
I need to design indicator lights for an Insulation Monitoring Device (IMD) for my school's electrical formula car. I have finished the design of the IMD itself, but the driver needs an icon/symbol ...
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low power DC down converter using input voltage of several kV
Suppose I've got a free DC power source that delivers in the range of a few milliwatts, unfortunately at several kilovolts, which is impractical for most if not all uses. 3-5V would be nice.
That ...
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Circuit to switch between two large DC voltages
I need to design a circuit driven by a function generator's square wave to switch between two large DC voltages in the ballpark of 10 Hz (one will be 300V which I'll call HV_L, the other will vary ...
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Soft-start implementation for a high-voltage MOSFET regulator
I'm working on a high-voltage linear regulator using an IRF840 MOSFET, and I would like to know if it's possible to modify the circuit to achieve a soft-start (slow turn-on) behavior at power-up. The ...
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Correct sequencing for plate voltage and filament bias in a 12AU7 tube power supply
I'm designing a power supply for a JJ Electronics 12AU7 triode and need clarification on the proper power-up sequence to maximize tube lifespan.
Power Supply Details:
Plate Voltage (B+):
Transformer: ...
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SiC MOSFET Dynamic Characteristics: VDS Overshoot
As it always knows the SiC MOSFET turn-off VDS overshoot decrease with the Rg increase, However, as I simulated in LTspice, when Rg is small to some extent. In other words, when switching speed is ...
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PCB clearance and creepage requirements for 1.5kVDC isolation
I need to purchase the relevant standard, but don't want to spend money purchasing the wrong standard.
Can PCB creepage and clearance guidance for 1.5kVDC be found using IPC-2221C?
Is that the ...
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Multiplexing large pulses
I’m working on a PCB at the moment which has a pulse generator which generates 20 V, 1 μs pulses. I need to send this pulse to many different endpoints on the board which will each pull between 20 mA ...
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Bipolar high voltage +/-100V@2A for ultrasound tranducer
I’m designing an ultrasound pulser-receiver using either the HV7360 or HV7361. Both components can handle ±100V and outputs can source and sink up to 2A current. However, I’m struggling to find a ...
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High voltage switch - simulation vs reality
I have prototyped the circuit in the attached photo. It is a high voltage with aiming to achieve a rise time <= 100 ns across the load R1.
In reality, the waveform I probe on R12 using a 1 Meg ...
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Designing an high speed high voltage switch with fast edge
I need to switch 600 V across a load (which can be regarded as a 10 MegOhm resistor).
To switch off the load anything below 200 V across it will do, so the actual voltage swing could be 400 V or so.
I ...
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Intermittent high voltage output from old Radio Shack plasma ball
I have been repairing an old 1980s vintage Radio Shack "plasma ball" that has suddenly stopped working.
I diagnosed two problems immediately: First, the input step-down transformer (24VCT/...
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Difference between positive and negative polarity impulse voltage (1.2/50) [closed]
In cable testing, what is the difference of using positive and negative polarity impulse?
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What electronic component is this? I am trying to identify a component from a youtube video
What electronic component is this?
https://www.youtube.com/watch?v=G2brxBRnRH4 In the first few seconds of this video, the component is shown, also at the 10:12 timestamp it is again shown clearly. I ...
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How to amplify 2S LiPo voltage to 150Vp-p for piezo buzzer (30nF to 300nF) at 3.2KHz
I have a 2S battery and need to amplify the voltage to 150Vp-p for two piezo transducers, one rated at 30nF and the other at 300nF. I can do the former with a piezo driver, DRV2700, but the high ...
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FEM simulation of a high voltage composite dielectric configuration - interface charge and surface conductivity
I constructed a axisymmetric FEM model of two electrodes, one at 500 kV, held apart by a solid dielectric component immersed in SF6 gas.
I then extracted the information about tangential, normal E ...
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Can you connect multiple flyback transformers in series?
I want to make very high voltage AC (maybe 50kV) for capacitive wireless power transmission experiments without the complexity of making a Tesla coil. I plan to do so by connecting these high voltage ...
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High side switch to control a capacitive load between 0 and 800V
I am designing a circuit that would allow me to control the voltage applied to a capacitive load (between 50nF and 1000nF) from 0V to 800V. The maximum current to charge my load will be then around ...
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