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Calculation of SMPS resonant parts
Calculation of SMPS resonant parts
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Old 11th October 2019, 10:26 PM   #51
voltwide is offline voltwide  Ireland
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Join Date: Jan 2010
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, 09:46 AM   #52
kees52 is offline kees52  Netherlands
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Join Date: May 2009
Location: Sprang-capelle Holland.
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 Yesterday, 12:46 PM   #53
kees52 is offline kees52  Netherlands
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Join Date: May 2009
Location: Sprang-capelle Holland.
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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