Hopefully? Another 48vdc-240vac Toriod Inverter build.

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KeepIS Guru Joined: 13/10/2014 Location: Australia Posts: 1860	Posted: 12:32am 13 Jan 2023         poida said   Hi there, It's good to see someone new building an inverter Maybe you can use some of what follows, maybe not.. re: primary winding LC tank behavior 1. resonance above about 45 Hz and 2. not saturating at peak power levels The choke used in the (3 year so far) working inverter uses 2 of the large E cores, with a 1mm air gap in the middle pole. They need about 7 turns to get 40uH and they are wired in series. Testing showed little saturation at 80 Amps and moderate at 90 Amps. The 50V supply x 90 Amps means about 4.5kW peak power I blew it a couple of times when I had a resonant freq of about 10 or 15 Hz. Once enough choke is built, I had to choose a small enough cap to give me something more than 45 Hz. Once that was done, the inverter survives. The cap I use is 1uF or maybe .68uF, I can't recall Hi, first and apology: Somehow I missed your earlier post - don't know how????? This is my play/test setup to get ready for testing my own build based on Wiseguys design with his latest revised EG8010 driver. I'm trying not to destroy the test unit but, whatever, so blowing out the cobwebs from ancient memory, and having fun.           I had already resonated the toriod secondary to 75Hz. Question: You mentioned re adjusting the resonance after fitting the choke. Wondering how did you did that, I initially used a precision generator and CRO to set the secondary CAP value. I doubt having the choke connected would make that static test for resonance change that much?   Current value of Cap is 4uf for 76Hz I was just about to post my test on an E70 N97 core, I will still do that, but it made me wonder about getting a second set to double up and get the inductance higher, shame the postage on them is as much as the dam cores