Several other people have tried various techniques in regulation, but for simplicity, I decided to use Bang-Bang-Control for the buck. Yes, that is a big part of it too. After figuring out some bugs with my circuit and replacing a faulty optoisolator, I tested the buck converter using 3 light bulbs as a load 12 Ohms , a small uF bus capacitor with a VDC power supply. Having built several successful coils, I wanted to try my hand at a more advanced project. These are the following improvements I plan to make since my original project goal has now been achieved!

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In addition, the srsstc impedance primary to keep the primary currents reasonably lll throughout the long pulse duration allows the use of a lower voltage capacitor. I used a standard voltage doubler circuit for the main bus caps for my buck, so measuring the output was somewhat tricky to prevent ground loops.

For tapping the primary, I found it best to simply cut segments of the insulation on the wire off. This was designed to fit a common 10 x 12cm heat-sink.


The bus capacitor uF was charged up to about VDC, and a ramp signal was sent in. This gave me kHz. As mentioned it turned out that the resonant frequency of the unloaded secondary seems to hover around – kHz, which was higher than I had expected.

For example at V, a 10k resistor would need to be rated to be 12W for constant operation.


The solder-on pads should also make replacing the IGBTs easy if required. Please read our Disclaimer and Policies page for information on your rights and responsibilities regarding this site. Since drsstx filter is low-pass, all the high frequency switching associated with the PWM is removed and the average voltage of the PWM comes out.

Drsstc Pll Driver

I’d love to hear about your projects too! However, it must have high RMS current handling capability since we will be running several thousands or more of RF cycles per pulse. After trying out various values, I found the perfect adjustment.

Notice how at the red line, the inductor current no longer drops to 0A and is always positive, and this point shows the transition from discontinuous mode to continuous mode.

DRSSTC driver tests

So after a while, I got around to implementing it properly with interrupts. I have some bilateral switches that i will likely stick in there to either disconnect the Plll output from the VCO in, or connect lll VCO out into the other PC input im thinking the earlier is more reliable. There were a few options I was considering for my buck control. I also made sure my inductor would dsstc able to handle all the current. The sparks and everything look just the same so i didnt bother taking pics of it running with the new driver.

This control seems to have been successfully tested such as in Steve Ward’s design. Having built several successful coils, I wanted to try my hand at a more advanced project. All signals are sent via fiber-optic for safe remote control.


It is important to use a fast comparator to ensure the buck regulates quickly. As you can see, the buck is regulating!

But, ive discovered one serious drawback. According to simulations and some measurements carried out by Steve Ward, the actual voltage produced at the top of the secondary coil doesn’t exceed more than several 10s of kV around 50 – 70kV.

Since I moved to a new place, I did not have access to my original workshop plk its isolated 60V power supply, so I had to test the buck off a current-limited mains supply. These are the following improvements I plan to make since my original project goal has now been achieved!

Welcome Username or Email: Here we plot the current versus voltage for a voltage ramp from 0 to V across varying loads R.

I had a spare nF 1. I’ll be thinking about this a bit more. The very low permeability of the No. Also, because i had to slow down the response time of the PLL, it doesnt respond quite as nicely to the raw DC input.