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Forum Index : Electronics : Warpspeed’s low frequency stepped sine
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renewableMark Guru  Joined: 09/12/2017 Location: AustraliaPosts: 1678 |
Ahhh, I never though of just sync'ing them. My head was focused on syncing with a gen to connect them together. I tend to get tunnel vision on projects. Cheers Caveman Mark Off grid eastern Melb |
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| Warpspeed Guru Joined: 09/08/2007 Location: AustraliaPosts: 4406 |
O/k Mark here we go again. Using the trusty flux calculator https://daycounter.com/Calculators/Max-Flux-Density-Calculator.phtml I cannot now remember if I gave you figures for number 3 transformer before Easter, but here they are again anyway. The secondary of #3 needs to support 25.0v at 1.0 Teslas with a core cross sectional area of 67mm x 50mm. Secondary voltage 25.0 Frequency .00005 Mhz (four zeroes 50Hz) Turns 34 Area 33.5 cm sq (67mm x 50mm) B max 9,887 gauss or 0.9887 Teslas Secondary 34 turns 8mm squared wire to support 30 amps (4 amps per mm sq) Lowest dc input voltage for Mark's design will be 44v. Primary turns = 34 turns x 44v/25v = 59.84 turns. Close enough to 60 turns. Primary current 30 amps x 25v/44v = 17 amps. Primary wire size about 4.26 mm sq. ********************************************************************************** Number 4 transformer. Secondary of #4 needs to support 8.33v at 1.0 Teslas with a core cross section of 46mm x 47mm. Secondary voltage 8.33v Frequency .00005 Mhz Turns 17 Area 21.62 cm sq B max 10,209 gauss or 1.02 Teslas Secondary 17 turns 8mm squared wire to support 30 amps Primary turns 17 turns x 44v/8.33v = 89.8 turns. Close enough to 90 turns. Primary current = 30 amps x 8.33v/44v = 5.68 amps. wire size 1.4 mm sq. Spread the turns of both primary and secondary fairly evenly right around the whole toroid for best results. Cheers, Tony. |
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| renewableMark Guru Joined: 09/12/2017 Location: AustraliaPosts: 1678 |
Thanks Tony BTW with No3 can I use more mm2 than req'd for the primary? I have plenty of 2mm2, so could either go 4mm2 or 6mm2. It's only a little coil so 3 layers of 2mm2 will be easy. With No4 primary can I use 2mm2? Cheers Caveman Mark Off grid eastern Melb |
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| Warpspeed Guru Joined: 09/08/2007 Location: AustraliaPosts: 4406 |
Sure, the above figures are only a suggested rough target to aim for. Use whatever wire gauge that comes fairly close, even if it turns out to be a bit less. You can go as large as you like as there is a mile of room on those huge toriods. Cheers, Tony. |
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poida Guru Joined: 02/02/2017 Location: AustraliaPosts: 1419 |
I have done exactly nothing. I checked from all angles. Nothing. You are going well with your build. My priority is to make a 16 MOSFET Madness power board, and a nanoverter to drive it, to be used to power the house. And figure out why that inverter makes so much noise. wronger than a phone book full of wrong phone numbers |
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| poida Guru Joined: 02/02/2017 Location: AustraliaPosts: 1419 |
correct wronger than a phone book full of wrong phone numbers |
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| nickskethisniks Guru Joined: 17/10/2017 Location: BelgiumPosts: 458 |
I found some rifa capacitors with 47000uF value, 63V version and 100V version. The 63V version is half the price of the 100V version. Wich one would be recommended for 48V use, the end voltage of my battery bank is 56V (16cel lifepo4) ? It would be a winter project, but when I can I try to source some components, spread the total money keeps the wife happy. |
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Tinker Guru Joined: 07/11/2007 Location: AustraliaPosts: 1904 |
While I'm not in a position to recommend any I can tell you I will be using 33000uF/100V capacitors, 3 of them. That is with a lithium battery bank which usually sits around 54v fully charged. Klaus |
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| Warpspeed Guru Joined: 09/08/2007 Location: AustraliaPosts: 4406 |
The higher voltage capacitors will be physically larger, and being larger they will run cooler at any given amount of ripple current. If you check the specifications for both, you will very likely find that the physically larger higher voltage capacitors have a higher ripple current rating than the smaller capacitors. For similar reasons, three 33,000uF capacitors will have a higher combined ripple current than one 100,000uF capacitor, because there will be more total exposed surface area. Cheers, Tony. |
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| nickskethisniks Guru Joined: 17/10/2017 Location: BelgiumPosts: 458 |
Yes, but in my case 7pcs 100V would be more expensive then 10pcs 63V, so with 63V I have the same riple current but higher capacity for a lower price. Allthough 63V is on the low side and I could not use the solar panels (+- 75V) directly on the inverter. I used 100V in my OZinverter, for safety reasons my batteries getting disconnected in out of range situations in the past. So I had a few situations my OZinverter got 75V... stil with no problems because I used 100V rated parts. Now I have mosfets disconnecting my panels first @ end of charge. |
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