No No NO ! of course i'm not meaning that it is due to the instability of feedback loop ! however it can has a little effect on these overshoots . did you get my idea ? my idea is decreasing ESR and ESL . replace that 1000 u capacitor with some low value capacitors in parallel and at last an MKT capacitor ( 100n) in parallel with all of them . you understand ?
We have two voltage divider resistors . the top one called R1 and below one called R2 (if) then use a 10 uF capacitor in parallel with R1 . it will help to reduce fast changes .
i did what you ask for. but have the same problem after changing the capacitors. i connect 104 and 100uF capacitor (Previous 1000uF) one by one, but the same result
i have attached the waveform of the noise. kindly tell me what should i do
there are two type of filter as auxiliary filter , first one is an LPF with L and C without diode ,( it is after the main filter ) ( by the way , has the core of your main filter any gap space ? )
and second type is kind of differential filter , ( such as filters that we using as EMI filter .)
Good luck
Goldsmith
refer me some type of circuit. i am not at the stage to study it. i have to give my boss the operational PSU. after that i will study. but now i want to know that components which i should use to have the perfect result
At first test those capacitors , and at second tell me the specifications of your SMPS , ( frequency of operation , arrangement , and value of your out put filter, and voltage before your filter ( square wave ) and after it )
my operational frequency is 100KHz. i have used SG3525. output voltage is 3.5V and 3A. Input is 24V. Mosfet is used irf540. for filteration MUR3020 (using Push-Pull Terminology). inductor of value 22uH. feedback is connected at the output to SG3525. i dont have the exact voltages of transformer input and output
What kind of compensation network you have used ? and how you don't know the voltage before your filter ? how you have designed your circuit ? it is pretty important to know the voltage before your filter .
Best Wishes
Goldsmith
SG3525 have opamp in it for comparing the voltages of reference and supply. i just adjust reference voltage and voltage divider on the supply voltage.
i really didnt remember the voltage before the filteration
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SG3525 have opamp in it for comparing the voltages of reference and supply. i just adjust reference voltage and voltage divider on the supply voltage.
i really didnt remember the voltage before the filteration
- - - Updated - - -
SG3525 have opamp in it for comparing the voltages of reference and supply. i just adjust reference voltage and voltage divider on the supply voltage.
i really didnt remember the voltage before the filteration