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Registered Member #1925
Joined: Sun Jan 11 2009, 10:10PM
Location:
Posts: 2
I am planning to make a power supply with hv output pulses. Peak value is 30 kv and the pulse width will be short. Frequency will be low and adjustable(0 to 20~25 Hz). How can i realize this project?
Registered Member #902
Joined: Sun Jul 15 2007, 08:17PM
Location: North Texas
Posts: 1040
capacitor pulse into an ignition coil should work... and, IIRC, the result should be nowhere near square wave as once the current/voltage rise peaks the transformer will not function until it changes direction, as a constant current cannot induce a current in a secondary winding except for the rise time from the moment it is connected...
Registered Member #543
Joined: Tue Feb 20 2007, 04:26PM
Location: UK
Posts: 4992
You don't say what the output impedance of your device should be, so if your application will accept a high impedance, why not make a multivibrator with two EHT shunt triodes like PD500 - then you will have a square wave whose duty cycle you can vary very easily.
Registered Member #503
Joined: Sun Nov 19 2006, 06:37PM
Location:
Posts: 59
Hi ,
You can use a uC to generate the pulses and feed it to a MOSFET,through a MOSFET driver.Give huge flexibility,esp if you want to do other stuff too.I had used a PIC with a ceramic resonator (455kHz ) to realize the low frequencies.
The transformer was a CRGO UU core,with an air gap on both legs of about 2 cellotapes thick.Use very low duty cycles of about 10%. As the frequency goes lower,duty cycle goes higher and gap is increased, the voltage increases,atleast for my txfer.
A ferrite txfer would probably not work at these low frequencies,maybe the experienced guys here could tell why !!
Registered Member #15
Joined: Thu Feb 02 2006, 01:11PM
Location:
Posts: 3068
terspolarma wrote ...
I am planning to make a power supply with hv output pulses. Peak value is 30 kv and the pulse width will be short. Frequency will be low and adjustable(0 to 20~25 Hz). How can i realize this project?
You're missing a lot of requirements here. Please specify what they are so we can better answer your question:
1. Pulsewidth? 2. Risetime / Falltime 3. Duty Cycle (or PRF) 4. Load Impedance your driving into 5. Pulse-to-Pulse regulation 6. Pulse Variability (variation on top of the pulse - do you want a clean pulse, or don't care if it rings with several kV amplitudes) 7. Allowable Pulse Droop (relates to 6 above)
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High voltage pulses
