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Re: unipolar spwm question.
yes.signal frequency is 50Hz..
i had change the DC supply to 5V and replace MOSFET with IRF540.
ok,i will try the op-amp 741 method.
Re: unipolar spwm question.
the triangular signal is generated by the function generation,the value is 2.5V peak.
i have no problem in getting this triangular signal.
the problem is sine signal with 180 degree in phase.anyone know how to invert the sine wave?
Added after 4 minutes:
i...
unipolar spwm question.
There are sine wave input and triangular input.the sine wave input 2V and -2V that input to the comparator LM111.
i want to generate the unipolar spwm that apply to n-channel MOSFET in my h-bridge circuit.
the problem is how to make the inverted sine waveform that...
it is actually converting the triangle wave to sine wave.
but i want to study the 4 diodes part,which i think is main factor to shape the triangle waveform,here is my circuit.
Added after 2 minutes:
ya,i know limiting the current flow to the birdge,but why choosing the 51k value...
here is the image i upload,i dont know what it call,i want to study this circuit,but dont know how,i know it is just a diodes characteristic,but some how im still not understand.
hi guy,mind to know how does the R8 and R7 influence the overall circuit?
is the op-amp act as amplifier in this case?if it does,how come the input no have resistance?
should like this.
im working on this.very hard to understand.my part require the generator can be manually set frequency modulation (Mf) and amplitude modulation (Ma). which mean the sine wave generator and triangular wave generator have to be variable frequency and amplitude.the mosfet transistor is not easy to...
i had done the triangle circuit and sine wave circuit,which is the 1st phase for overall.the h-bridge is later phase,i had really read the pwm book borrow from library...after study it,i thought it is going to be easy.after that i searching schematic online for h bridge.I found the it,the file i...
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