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Calculation of SMPS resonant parts
Calculation of SMPS resonant parts
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Old 11th October 2019, 11:26 PM   #51
voltwide is offline voltwide  Ireland
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Have a look at the primary overcurrent during power up while charging the secondary caps. Is it inside SOA of the PowerMOSFETs? I assume not so you will need some kind of softstart or current limit otherwise there is some good chance for the MOSFETs to blow upon the first power up.
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Old 12th October 2019, 10:46 AM   #52
kees52 is offline kees52  Netherlands
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Quote:
Originally Posted by voltwide View Post
Have a look at the primary overcurrent during power up while charging the secondary caps. Is it inside SOA of the PowerMOSFETs? I assume not so you will need some kind of softstart or current limit otherwise there is some good chance for the MOSFETs to blow upon the first power up.
Startup is high, but that will be done properly when build, the model has no soft startup, it is just a simple vco model.

Problem was the feedback, it runs out without load giving max unregulated voltage, a LCC version was able to do it properly, so I think the tank gain or Q is cause.

The softstart is included in the chip, I believe it starts below resonance or above, (what is used) and adjust after caps are charged.

I need a proper calculation program for multiply outputs, I see it affects resoance when used not properly.


regards
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Old 20th October 2019, 01:46 PM   #53
kees52 is offline kees52  Netherlands
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Here I have the simulation for the tube supply in resonabce, it is open loop and I did see that it keeps quite good the voltages when amps get drawn, on max, just 2 volts.

I go use LM type of regulators after the 18 volts out, for the tubes filament.

I am a little worried beacuse of the calculation of the multiply windings for all the voltages, it afeect resonance and it is not easy to calculate, so need of doe it experimentally or I can use a resonance forward calculator to get close, there is calcular who can do more supply voltages.

regards
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File Type: asc hbill1-multivolt-openloop.asc (11.0 KB, 1 views)
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Old 21st October 2019, 03:56 PM   #54
kees52 is offline kees52  Netherlands
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I did not can resist to solve the feedback version for th tubes, I have managed to learn some more, Now i do now also how to do it.

The magnetics and the windings are a uge factor also the Qr and Lr Lm , in fact it is not that hard, for open loop keep the resonance above max gain, say some 10 khz, and it do well.

For the feedback and the low load, just adjust the secondary such that the feedback falls into the gain area.

But making a transformer with more outputs in real live? I have to see what happens.

I go start now with the design, first the small one, then de bigger one, I skin them alive.

Here nice reading about the resonnat converters.

https://pdfs.semanticscholar.org/ffe...4e0e62960d.pdf

regards
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File Type: asc hbill1-multivolt-dualfeedback.asc (12.2 KB, 2 views)
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Old 21st October 2019, 04:29 PM   #55
Osvaldo de Banfield is offline Osvaldo de Banfield  Argentina
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Why the +15V output is half wave rectified, while the other are full wave?

Shottky diodes in the 320V arm? Mmmm, rare.
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Old 21st October 2019, 06:18 PM   #56
kees52 is offline kees52  Netherlands
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Originally Posted by Osvaldo de Banfield View Post
Why the +15V output is half wave rectified, while the other are full wave?

Shottky diodes in the 320V arm? Mmmm, rare.
I had that with the high voltages of 320 volts half wave did not so good, get lower voltage and need induction up, saw
also with high voltages these are full wave. the 15 volts is for tube filament so not so much a problem i think. I can
use two transformer coils as i see much with two diodes.

But I can always change when building it to see whap happens, alsow ith rectifier stresses.

I have not seen the skottky, but change them for fast recovery types.

regards






regards

Last edited by kees52; 21st October 2019 at 06:23 PM.
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Old 21st October 2019, 06:37 PM   #57
Osvaldo de Banfield is offline Osvaldo de Banfield  Argentina
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But the single phase rectifier do affects the loading of the traffo, creating flux imbalance.

It continues making me noise the idea of working the device at open loop.
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Old 21st October 2019, 08:38 PM   #58
kees52 is offline kees52  Netherlands
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Originally Posted by Osvaldo de Banfield View Post
But the single phase rectifier do affects the loading of the traffo, creating flux imbalance.

It continues making me noise the idea of working the device at open loop.
So you advise to use double winding wit two diodes or a single winding with full bridge rectifier?

For the feedback I have now all the needed info, the chip has burstmode for this kind of low load, or skipmode. Nut I have also did with sim, and saw that then I need a very wide frequency swing. I can regulate open output, bet then with full load it does not regulate and vica versa, Q of resonant system and Lm/Lr difference does also made much of impact on it.

Best then is just a open loop, just above resonance, or so high above resonance that shortcircuit is self protecting.

I have order some more parts like a newer resonance controller, L6599AD chip


regards
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Old 21st October 2019, 09:24 PM   #59
kees52 is offline kees52  Netherlands
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This is a better way?

I do see a 4 diode full bridge for the 320 volts does better then the two coil 2 diode version. for the low 15 volts 15 amps max one the two coil does oke, winding get more complicated because the two coils need precise winded, so maybe a 4 diode one coil is the best way.

I think the most difficult is wiinding the transformer, because how i calculate the different voltages properly, the Q of resonat and frequency does shift also, need to find a good
calculator, or a way to do it myself.

regards
Attached Images
File Type: jpg dc gain chart.jpg (102.3 KB, 23 views)
Attached Files
File Type: asc hbill1-multivolt-dualfeedback.asc (12.6 KB, 1 views)

Last edited by kees52; 21st October 2019 at 09:28 PM.
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Old 22nd October 2019, 02:03 PM   #60
kees52 is offline kees52  Netherlands
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I did try to find the resonance point this way because of the multpy windings and voltages so see what happens when put more on.

Very interesting.

regards
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File Type: jpg findresonance.jpg (247.0 KB, 21 views)
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