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i want to write a code for outputing two gate drive pulses for a quasi sine inverter using PIC 16F72.
i am confused how to start to get 50 HZ drive pulses with pwm . do i have to use timer or pwm module or both ?for getting the two outputs . I am very familiar with the hardware part as earlier...
1) say negetive drop is -1V for reverse voltage (1St fault condition)
2) positive drop is +2v when overcurrent occurs.(2nd fault condition)
Now if i add 2 volt offset that means heathy condition will be from -1 + 2 = 1V and +2 + 2 = +4V
i.e 1 to 4 Volt . Below 1 is reverse fault and above 4...
From your statement what i understand is that forward drop is not detected in reverse voltage at transformer primary(O/P) as current direction changes and for that reason you need to detect the reverse drop and provide your microprossesor or sensing ckt with extra information to disconnect the...
i think MCB's will take some time before it trips so the using SBT 350 diodes seems a better solution.
i have modified the battery section circuit and attaching below for your refrance and further suggestions.
i have not fully understood the above can you elaborate .
I think for my problem the above is the most satisfying answer of all as sometimes at some installations
mosfets blow during presence of mains when the gate drive is off now clearly indicating the internal diodes are the the main culprits in my case. Suggested improvement in this direction will...
It is due to over voltage and not due to over current that my mosfets blow as discussed earlier.
In fact if i short my output (230V AC) terminals the inverter trips immideatly without any harm done and restart once the short is removed but once a different phase is applied at the output all...
1) check the year of manufacture.
2) if the battery service life is nearing its end check as below.
3) Connect the UPS and with multimeter check if the voltage is above 13 Volts on mains without any load and in charging position. If not allow to charge for few hours as per rating of battery
4)...
Mosfet works as the fastest fuse and blow immidetly. I think as PIN mentioned earlier......
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I think connecting Zeners is a better idea if both the drives ( should be complimentary always) characteristic can be maintained. Worth a try.
Than again the question arises .....How to sense the sense the accidental voltage on the primary(fast)and take the result to disconnect the primary (fast) so that no damage is done to the mosfets ???
As mentioned earlier that there are smart mosfets available that trips itself in case
of over temperature occuring. In my case mosfets simply burn ,so i think selecting
such mosfets will be one of the best options of reaching to a complete solution.
please note that my charger is completely separate . i am using a separate SMPS charger card charging the batteries and i dont need mosfet diodes for charging.
Does this mean i should use mosfets without internal diodes instead of IRFP 250 ? Will this solve my problem ?
When you have few...
No i don't understand what you mean by bulk diode conduction problem ? can you explain in more details ? further i also did not understand " to allow the center tap of transformer to rise to 40V"
Right FVM that IRFP250 are rated at 200V and i have overload protection by sensing the drop on a shunt across battery negative and inverter immidietly trips with 150 % excess load. But But in case of 400v at output of transformer all mosfets
simply blast. In normal conditions mosfets are not...
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