hi everyone
i use this schematic to build a half bridge power supply.
but i have some problems and need some helps.
first problem is feedback.i think this feedback is not good beacause whit this feedback transformer produce a noisy sound like'tik-tik-tik'about twice every second.
i read some where this feed back dosn't control duty cycle and it just turn pwm on or off but i need a feedback that control duty cycle
without feedback there is no noisy sound.
help me to change feedback.what should i do?
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is there any problem or worng parts or circuits in this schematic?which part?and what is the correct part?
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i change this schematic a little bit.
my primary winding turns is 19 and secondary is 8*2
i use a etd 39 core
target output voltage is 45*2
i change frequncy to 80 KHz
Schematic.jpg
![Rar Rar](https://1.bp.blogspot.com/-LlBEFz9rANE/XShGfWub9BI/AAAAAAAAE3Q/lxmL6vLBsdkLK8AtcKl_24dVndwtO0soACLcBGAs/s1600/SMPS%2BHB%2BPFC%2B2200W.jpg)
Sg3525 Ir2110 Smps Rar Converter
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