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Hi all,
I have been wondering for a long time what is the purpose of series R2 C2?(see attached) The other part of the circuit is not important
I think it is some kind of filter but how can we calculate the corner freq, is it like basic low-pass or high pass RC? (1/2*pi*R*C ??)
Any help...
under or over voltage control circuit
if you still want to blow your fuse:
https://en.wikipedia.org/wiki/Crowbar_%28circuit%29
but you can use some other methods mentioned above.
regards
buck converter zener diode
hi jurc,
put a series lamp(2 or 3 series 50W lamp will work) to your mosfet and thus you will not damage your mosfet even your pwm signal reaches %100. then check your feedback circuit(or pwm circuit) and find what makes pwm %100.
regards
Re: forward diode wave
hi,
actually the Vd has same shape of the transformers primary side's waveform. look at my drawing. the amplitude is proportional to the ratio of transformer n1:n2. the switching element's maksimum voltage(Vsw max) is about 2 x Vdc voltage in theory. but it will be a...
two switch forward
hi,
you can use PFC+ "one switch forward converter" topology with ML4800(FAN4800,ML4824) or PFC+"two switch" with some additions. please look at the application notes from fairchild. i think there is an example with "two switch"
i designed an one switch forward converter...
ml4800 smps
ML4800(FAN4800), ML4824. these ICs are combo controllers with PFC-PWM drives.
there are some good application notes. take a look at the fairchildsemi.com
www.fairchildsemi.com/an/AN/AN-6032.pdf
www.fairchildsemi.com/an/AN/AN-42009.pdf
regards
boost converter mosfet
https://www.daycounter.com/LabBook/BoostConverter/Boost-Converter-Equations.phtml
look that equations and calculate it. and also basic power electronics books and internet would help.
regards
diode comparison
hi,
i noticed that but even if i worked with small voltages, like DC bus=25V, uf5408 draws 10 times bigger current. i found no reason for that.
regards.
diode characteristics comparison
actually its a square wave. D3 in the figure below.
and yes i tried 2-3 more but results are same.
**broken link removed**
regards
uf5408
hi,
i have two diodes HER208 and UF5408. they have same elecrical rating except HER208 is 2A and UF5408 is 3A.
when i tested the diodes in my circuit 5408 becomes very hot (60-70 °C) while 208 is at normal temp(30-40 °C). and i know from another test with very small voltages, 5408 is...
best opto coupler circuit
hi,
i am designing a smps whic is capable of giving 24V,10A.
i have a question. when i use TLP421 as a opto in my circuit current limit is 9A and if i just changed the opto(all the other hardware is same) to PC123 current limit increases to 9,6A. output voltage doesnt...
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