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Recent content by faraj

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    [SOLVED] How to protect my MosFETs???

    Finally, I tested the circuit with the inductive load and it's working perfectly and there is no problem. thank you everyone, specially KerimF
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    [SOLVED] How to protect my MosFETs???

    ok it was a mistake, everything is right.
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    [SOLVED] How to protect my MosFETs???

    thank you Kerim, i'll do it and share the result.
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    [SOLVED] How to protect my MosFETs???

    :D indeed it did give smoke but i was fast :). now i put a 50 usecs dead time between turning on the outputs, but it still heats up not like before although but if i increase the dead time more than this i wont be able to get the desired frequency output. and when i think of heating in a low...
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    [SOLVED] How to protect my MosFETs???

    Here I have another problem now. I use the circuit in post #17 and I have a resistive load about 20 mA and I switch the polarity of the load. when switching in low frequency (lower than 40HZ) there is no but as I increase the frequency the PowerMosfets heat up and in a high frequency like 5 KHz...
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    [SOLVED] How to protect my MosFETs???

    hi everyone, i made the circuit and tested it with resistive load and it is working properly, but i've not tested it with inductive load. i'll let you know the results after testing the system with inductive load.
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    [SOLVED] How to protect my MosFETs???

    so, the circuit in post #7 with 12 VDC supply and without 1k resistors in parallel with 10k resistors will work fine without blowing my transistors?
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    [SOLVED] How to protect my MosFETs???

    yes in the second circuit and also the last circuit there is a combination of P-channel and N-channel mosfets.
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    [SOLVED] How to protect my MosFETs???

    i also found another configuration of the H-Bridge and simulated it in Proteus with 12 VDC can you please take a look at this one and give your opinion. it seems to me that this one is more better than the previous one.
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    [SOLVED] How to protect my MosFETs???

    what if i use 12 VDC supply instead of 24 VDC? because i have both options and if this circuit would work with no problem with 12 VDC i prefer to use 12 volt.
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    [SOLVED] How to protect my MosFETs???

    yes, you are right, i did not notice at first and then i removed the 1k resistors and the simulation result was the same. ---------- Post added at 06:54 ---------- Previous post was at 06:49 ---------- i use a PIC16F876 PWM output to drive the transistors. indeed i just simulated the circuit...
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    [SOLVED] How to protect my MosFETs???

    Thank you everyone for your suggestions and helps. KerimF is right there are 2 type of IRF840 and one (IRPOWER) has internal protection diode so it doesn't need extra protection. and Alexan_e is right the circuit needed some changes in order to work propely. now i changed the circuit and it...
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    [SOLVED] How to protect my MosFETs???

    hi everyone, i'm working on a circuit in which i want to apply pulses to an inductive load. to produce pulses i'm using Power MosFET (IRF840). as the load is inductive i want to protect the mosfet against reverse current or what is so called. but my problem is that i'm applying pulses to the...
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    New version of Step 7-MicroWin for S7-200 PLC

    Hi everyone. I'm working on an automation project and I'm using Siemens S7-200 PLC series (CPU 224). I have Step 7-MicroWin but it's very old so I'm looking for the latest version of the software. One my friend gave me Simatic step 7 V5.4 but it doesn't support S7-200 series. Now, can...
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    codvision avr or AVR studio

    If i'm understood you mean i should write and simulate my C program in AVR Studio and then compile it on codevision, right?

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