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Topics - L_Mangold
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1
« on: September 27, 2019, 10:00:16 PM »
Hello everyone!
I have a question specific to some recommended capacitor choices for the MMC on a QCW set up. Because the MMC may be powered for more than 1000 rf cycles, Arms ratings and low losses are some of the top considerations. Some example coils like those built by Eric Goodchild and Goa Guangyan utilize silver mica transmitting caps. It was to my understanding that ceramic doorknob transmitting caps also have really decent Arms ratings, but other than a few VTTC example coils I've never seen ceramic doorknob capacitors in any SSTC set up. Is there a disadvantage to those doorknob capacitors that I'm unaware of? Any input is greatly appreciated!
2
« on: May 15, 2019, 12:42:46 AM »
Hello everyone,
I wanted to get a few other peoples' input on probing techniques for troubleshooting (DR)SSTC H-bridge circuitry. Currently, I have been using a used analogue CRT scope from Tektronics for probing pretty much everything from my driver to the actual power side of the coil(s) that I've been working on. The benefit of the analogue scope has included being able to see very short/transient spikes, as well as the fact that it has an add feature that allows for differential (I believe) measurements. I've been able to tune my primary, probe current waveforms, and even turn phase lead on the driver, but I've been nervous about taking any measurements when powering the bridge via mains. I just bought a Hantek digital storage scope, and an additional 1-100X probe so my old scope will now be my back-up one and provide an additional 2 channels in case I need more than 2 for one test.
My question is simply to inquire as to how everyone else probes their bridge; particularly probing the high side IGBT's and tuning phase lead, and whether or not you use a high voltage differential probe.
Thank you kindly in advance!
3
« on: March 05, 2019, 12:04:41 AM »
Hello, my name is Stuart and I am new to this forum. I’ve been lurking for a long time on 4hv and more recently here, and I’ve learned a tremendous portion of what I know from two wonderful references: Kaizerpowerelectronics.dk and loneoceans.com/labs. My field of expertise is biochemistry, not electrical engineering, but learning electronics has become a passion over the last 2 years or so. I’ve made a few SSTCs over the last year, and I’m currently working on my first DRSSTC. I’m extremely grateful for everyone who has shared their knowledge and experience on the subject, and I’ll try my best to contribute as well in a meaningful way. My only question today is if anyone has any experience using Dawncap capacitors as their primary tank capacitor(s), and if so, how successful was this design? http://www.dawn-cap.cn/index.php/Index/index/lang/en.htmlThese are abundant on eBay and aliexpress, so I’m curious if anyone here has any opinion on them, vs the standard CDE942 caps most designs use.
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