Electronics > Projects, Designs, and Technical Stuff
Pulsing PSU
ricko_uk:
Hi,
I am looking for schematic or any information or pointers to designing a simple PSU for pulsing applications (for general experimentation and testing of various parts - mostly coils) and with the following specs:
- charging an energy storing capacitor (for repetitive fast pulse discharge!) which can be anything between 100nF to 1uF and a variable voltage between 100 and 400V (variable so we can control the energy delivered)
- either isolating the capacitor when it needs to be discharged into the test system/part or be such that the charging part of the system does not get damaged by discharging the cap into what sometimes would be almost a short circuit (sometimes the test coil is few ohms or less)
- the frequency of discharge can be as high as 60Hz
What are the best types of caps for pulse applications and fast discharge (apart from the classic low ESR electrolitics)?
We are open also to suggestions to use some off the shelf sub-systems providing they are relatively low cost. Otherwise we can design the full PCB in house.
Any suggestions, pointers or even better partial or full schematics would be very much appreciated :) :)
Many thanks
Rik
NiHaoMike:
Can it be powered from the mains, and if so, does it have to be isolated? The most straightforward and robust solution I can think of is a bridge rectifier on the output of a variac with an incandescent bulb on the output as a current limiter. If isolation is needed, add an isolation transformer.
If you want to power it from a low voltage DC source, look up DC/DC converters for xenon strobes.
ricko_uk:
Thank you Mike, much appreciated! :)
Marco:
That's 4.8 Watt max, don't sweat the capacitor ripple current in the PSU.
Simplest solution would be taking a high voltage bench power supply and just a chunky resistor current limiter for charging and a DC SSR to disconnect it (they're slow, but it's only 60 Hz). With a 1K resistor it will still charge in a couple ms or less, which presumably is more than fast enough.
james_s:
https://uzzors2k.4hv.org/index.php?page=capcharger2
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