get2kamal
Joined: 15 Mar 2006
Posts: 16
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 25 Apr 2006 13:08 this will work???(suggestions Please) |
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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 ,,,,, when ac presents vcc1 will be available then mosfet
should turn on so vcc will be available battery charger should charge the battery
when ac is absent no vcc1, but vcc will br available because battery connected ton
vcc through diodes,,, important is mosfet should go off immediately and it should
isolate vcc and vcc1......, i hope this ckt will work but i have a little doubt about the
turn off of the mosfet,,,,,, give me your suggestions.............
kamal.....
Last edited by get2kamal on 26 Apr 2006 6:59; edited 1 time in total |
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get2kamal
Joined: 15 Mar 2006
Posts: 16
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26 Apr 2006 6:43 Re: this will work??(suggestions please) |
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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 DC-DC converter
(which is connected to VCC)whether AC is present or not DC-DC converter should
be ON.,,,,,,,,
when AC-DC ON it will feed power to the dc- dc converter and charger,,,,,
when AC is absent battery should feed the power to the DC-DC converter,,,
here my requirment is when AC is absent i want to isolate AC/DC from battery
(from VCC) I can achieve this with out mosfet it self ,,,,,,, i can use a diode
instead of MOSFET refer circuit 1........ but loss will be more (compare to MOSFET)
since i want to achieve much higher efficiency i want to replace the diode with a
MOSFET ,,,,,, so think in that way ....,,,,, better ideas and suggestions will be really
appreciated
kamal
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