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I do not know if I observed it well, but the higher the load, the feedback loop works at a lower frequency?
Maybe if I moved a single pole (fp0) to a higher frequency it would be better?
I've done more tests. I soldered 200nF between the comp and gnd plus plus the choke common mode choke and 4 capacitors 1000uF. The feedback loop was calculated as if the output capacity was 7000uF and the ESR was 3.57mohm.
Now the whole thing works much better. The transformer at small loads is...
asdf44
When I find a moment, I will try to carry out such an experiment by setting rigidly pwm.
Easy peasy
I just meant the primary side waveforms. Because the secondary side waveforms look weak to me even with a small load.
Below are still oscillograms from the primary side:
U_DS upper transistor
Transformer
I know that long paths are not conducive to low noise, but it seems to me that it looks pretty good. I saw much worse waveforms on the Internet and the inverters worked properly.
I based all calculations of the loop on two sources:
1. Switching Power Supplies A to Z Sanjaya Maniktala
2. https://www.biricha.com/uploads/8/9/8/0/89803127/foundations__part2.b__2.pdf
From what I read the type III compensator improves the stability of the loop because it includes fESR.
With...
I carried out tests for the new frequency fcross = 1/3 fLc -> 61Hz. Screen shots of the oscilloscope load approximately 1ohm. Measurement made at the output of the inverter.
2.5A Load
5A Load
7.5A Load
10A Load
15A Load
20A Load
You can see that the loop is unstable, the transformer...
start with 3x slower than the o/p filter ...
Okay, but please guide me from which frequency the crossover loop should be 3 times slower?
Should fcrossover be 3 times slower than fp0?
Should fcrossover be 3 times slower than fLC?
Easy peasy
The diagram is a 47uH choke, but currently I run tests on a 250uH choke. I thought that too small inductance is a problem.
It will apply the current loop 5 x slower than the voltage, but the issue of the frequency of the voltage loop remains.
Could you tell me what the frequency of...
Easy peasy
I place the PCB diagram of the power part and the PCB diagram of the control part
The resonant frequency of the LC filter is fairly low at 184Hz.
In general, I counted the compensation factors in the following way:
Cout = 3 x 1000uF
Total ESR = 8.3mohm
Lout = 250uH
fESR = 6392 Hz...
Welcome,
Plans to design an adjustable power supply based on the SG3525 controller with the possibility of voltage regulation ~ 0-30V and current ~ 0-20A.
I have a working power stage, which is able to give over 20A at 30V, while I have a problem with the implementation of the feedback loop...
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