3 votes
Accepted

High Voltage Fusion Reactor Design - Electrical safety/risk of arc flash?

As I understand this apparatus, high voltage is fed through an insulated feed-through into the vacuum chamber and a gas discharge through mostly rarefied deuterium gas takes place between the (...
3 votes

Why does my coilgun stage driver keep burning out MOSFETs? (Part 2)

300 volts divided by 42 uH gives quite a high current growth rate about 7 A/us. In 150 us that means a high peak current, over 1000 amperes. Fets themselves probably limit it to a lower value as your ...
2 votes
Accepted

Please help me to understand this circuit (DC-DC HV generation 5 kV)

Probably ripple cancellation. Consider the usual (series) voltage regulator circuit, embodied by LM317 and etc.: extra voltage (plus undesired ripple/noise) is applied to a pass device; the noise is ...
  • 13.3k
2 votes
Accepted

What is the relationship between a power line's voltage and the amount of power it can transmit?

There are a lot of factors at play in the increase of the capacity of overhead transmission lines as the nominal system voltage increases. By "capacity", I mean the thermal limit based on ...
  • 386
2 votes
Accepted

In practice, is the ganging of a large number of SCRs in parallel often more expensive than an equivalent hockey puck?

Thyristors don't really like to be paralleled because it's like paralleling diodes each with a slightly different voltage drop. You need extra junk to make sure they current share properly or else ...
  • 53.1k
2 votes

In practice, is the ganging of a large number of SCRs in parallel often more expensive than an equivalent hockey puck?

For instance, a 10 x 10 array of 100 V, 100 A SCRs can handle the same current and voltage as a 10 kV, 10 kA hockey puck. Herein lies your problem. A 10×10 array of devices has 10 columns of 10 rows. ...
  • 3,089
2 votes

Why does my coilgun stage driver keep burning out MOSFETs? (Part 2)

You're almost certainly operating outside of the MOSFET SOA. Based on ideal operation, you're right on the edge of what your MOSFETs can handle, with no real margin for non-ideal effects. Your MOSFET ...
  • 10.3k
2 votes

Why does a locomotive pantograph arc when lowered even though the circuit breaker is "open"?

I doubt that the circuit breaker is actually open if there are sparks when the pantograph is disconnected. Here is a pretty good explanation and block diagram for a modern electric locomotive. Here ...
  • 4,986
1 vote

Special power supply - High-voltage diodes in series

What you want to do is pretty difficult to achieve. Let's take the Vishay VS-VSKE320-20PBF as an example, which is a 2kV, 320A diode that (unlike the one you linked) actually gives a rating for its ...
  • 12.7k
1 vote
Accepted

Reading potentiometer value in high voltage circuit externally

Assuming that what you want to do is measure the voltage at the wiper of a potentiometer that is connected to 40 VDC with an ADC that has an input range of 0 to 5 VDC what you need to do is reduce the ...
  • 11.8k

Only top scored, non community-wiki answers of a minimum length are eligible