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Re: how to calculate the hold up capacitor in power supply..
thanks for your reply davood,.,.,.,
but the exact method is(i got it from one application note),,,,,,
switch off the smps @ 150 v ac (not @ 230 vac) o/p voltage should be with in regulation for 20ms......
c hold up ≥ (2 × pin × t...
capacitor holdup energy
hai,,.,
how to calculate the hold up capacitor in swich mode power supply ,,, it is a AC/DC converter min AC line voltage is 150 v,,, o/p volage 35 ,current 3.5 A,, requir hold up time 20 ms......
regards
kamal
Re: this will work??(suggestions please)
correct,,,,, task is mosfet should turn off sharply when ac is not prsent.
let me explain my requirment,,,
when AC present VCC1 will be prsent (from AC-DC converter which i mention as
DC source.)this VCC1 is the source for the battery charger and...
ok,, but 12v,,, 100e it is already enough current ,,,, any i cant reduce the collector resistor further becaust it is a loop component ,,, reducing this will make the loop un stable,,,,,,but adding 10e resistor Emitter to gnd helped me
thanks & regards
kamal
hai every one,,.....
refer the circuit ,,,,here vcc 1(dc source ) i am generating from ac source
( ex- smps)here i used p channel mosfet as a switch(refer ckt),,, through mosfet
vcc will be generated which will be the input for a battery charger ,,,,,, . my
requirment is like this ...
hai,,,
there is an application in which i have to sense +12v and +5v if any one out put
goes out of regulation ,,,, like if +12 out put reduced less than 10v or increased
more than 6 v,, similarly if +5v reduced less than 4v or increased more than 6v i
have to give one high signal,, in an...
q8 collector is connected to xxxxxxof the above ckt.....opto tiansistor collector is
connected to feed back pin of the top switch in the primary side ,i am using tl431
for loop control.at normal mode q8 will be off and loop will be closed through
tl431,when o/p current is out of range q8...
hai every one
i am using this ckt for o/p over current protection in smps.
this ckt is working effectively at normal operating condition but when temp rises
(@ 50°c) it is gonig gracy.example ,,,..... if nominal load current is 3A ,,, i set over
current protection at 3.2A it is working...
:D zvs full bridge converter design --------------------------------------------------------------------------------
hai every one,,,,,
for zvs full bridge converter how to select l-c tank circuit in zvs and how to fix its frequency??????????? and i need transformer design...
hai every one,,,,,
for zvs full bridge converter how to select l-c tank circuit in zvs and how to fix its frequency??????????? and i need transformer design notes for the same
i tried few application notes,,, but i did not get the specfic design notes for this topology ,,,,, help me !!!!
Kamal
Hai every one
I want to simulate (in pspice) one dc-dc converter using UC3845 PWM drive but i did not get the p-spice model for UC3845.can i get a free pspice model for UC3845.
please let me know....................
Thanks & Regards
Kamal
thanks! but this is not exactly what i need.......i dont want any application notes......since there are different methods to design a fly back..... i want know about the perfect and most effective design method.and i want to know the important design considerations.....
Thanks & Regards
Kamal
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