6 votes
Accepted

I need to generate a +200V polarization voltage (Stable, low noise, micro-amp output)

The laziest approach is to simply buy a DC-DC converter. More like $50 one-off than $4K. An isolated one will give you the most flexibility. I see 10mV p-p ripple as a standard spec. Eg. Bellnix BYH ...
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4 votes

Sizing of high voltage electric vehicle cables

The 'size' of a wire in mm2 refers to the area of the copper conductor only, which is determined by the current, not the voltage. Until you get to tens of thousands of volts, where the conductor ...
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  • 140k
3 votes

Interface to sense 5kV through microcontroller GPIO

I want to sense the DC voltage of a capacitor from 0V to 5kV. ... I can think of using either a transformer If you think transformers work for stepping down DC then maybe you shouldn't be working ...
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  • 46.1k
3 votes

If I use a voltage multiplier will the output wattage be less than the input wattage?

You need to distinguish between fundamental limitations, and practical limitations. Practically, all converters will deliver less output power than they take to run. However, some converters will lose ...
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  • 140k
2 votes

Breadboard type for valve circuits?

I've been breadboarding tube circuits for over 60 years. I used to use wooden boards with screw-on terminals, but recently I've been using the plastic solderless boards which are designed for low-...
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2 votes

Help designing a safety indicator for a high current transformer

The most common indicator for a safety no-voltage/current is a low voltage Neon Indicator with 220k current limiting resistor or as desired. https://www.intl-lighttech.com/instrumentation-sensor-light-...
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1 vote

Do high voltage modules produce electromagnetic waves?

Xrays are produced in very small gaps to match the 1/4 wavelength or harmonics with a radiator horn antenna and repeated for digital imaging purposes are safe in dental offices. One spark is not going ...
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1 vote

Interface to sense 5kV through microcontroller GPIO

Here is my proposed circuit. It shows an ATtiny85 as an example of µController but any ADC input is suitable. The OpAmp is good for a single 5V supply. The OpAmp output will go from 1V to 4V with an ...
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1 vote

Help designing a safety indicator for a high current transformer

On secondary side it is difficult because the insulation. Much easier it is on the primary side. No voltage on primary side => no voltage secondary.
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  • 21
1 vote
Accepted

Power supply design requirements for IGBT driver

For drive supply requirements I go by the highschool physics approach: \$Q=CV\$ and \$I=dQ/dt = f_{pwm}*Q\$ (note that dQ is the difference in charge to create the gate leading edge, the trailing edge ...
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  • 487
1 vote

Help designing a safety indicator for a high current transformer

Knowing if there's any current flow in the secondary (or the primary) doesn't really help much from a safety standpoint. Suppose there's nothing attached to the output, there would be no current flow ...
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  • 3,556
1 vote

Help designing a safety indicator for a high current transformer

There are several companies that make current sensing indicators using a mini CT and LED. These provide electrical isolation up to some point. Wiring it in the return wire on a grounded HV system ...
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  • 159k
1 vote

Soft Latch ON-OFF with support of DC High Voltage side, compatibile with Arduino or any Low Voltage MCU (with schematic)

Here is the variant with voltage divider for p-mos gate voltage: In this case Vgs maximum will be 60V * 20k / 120k = 10 V. All transistors and diodes should be rated for maximum input voltage. I don'...
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1 vote
Accepted

Coupling an AC signal to a HV DC bias with a capacitor and OpAmp

I would not count on a blocking cap by itself to do galvanic isolation at 1500V. A large transient could overwhelm it (even a ‘Y’ cap that is intended to fail open.) Thats probably why you don’t see ...
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  • 40.2k

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