Welcome to this tutorial about the singlephase PWM inverter. This is one of the five inverters available with the chopperinverter control applications. Just leftclick on this button to start it. In the new window, under function selection, select the function you want to use by clicking on its name. Here, select singlephase PWM inverter. Now let's take a look at the settings have this function here. Switching frequency up to 20,000 Hertz. Frequency adjust the output voltage frequency from 0 to 120 Hertz. Peak voltage percentage of DC bus Set the peak output voltage.
In percentage up the input DC voltage Q1, Q4, Q2, Q5. The switching transistors you can choose PWM, or always on or off for troubleshooting. Status indicates if the function is started or not. There are also the two knobs here to adjust the frequency and peak voltage. And finally the startstop button to control the function. To help you connect your equipment, an electrical diagram of the function is presented with the Show Connection button for easier connection process. When your equipment is correctly connected start the function. The yellow curve is the input voltage in AD.
The blue curve is the output voltage in CD. And the purple and red curves are the PWM signal of Q1 and Q2 respectively. As you see, the yellow curb is DC voltage while the blue curve is AC voltage, indicating that the inverter is working. Note that I'm using the lowpass filter at CD to get rid of the 20,000 Hertz signal in the output voltage created by those transistors. Only small spikes remain. If I vary the frequency, you can see that the output AC voltage is varying the same way.
Microcontroller based mono stable compared to 555
Hello many of you might be very familiar with 555 timer and I would not go into details of that we would like to discuss some comparison between and analog type versus the digital type 555 timer in this in the typical mono stable mode which is triggered from pin number 2 driven low is typically a resistor and capacitor based system where the time peroid is decided by 1.1 times R1 C1 we all know this but the problem with this is the that if the value of R changes or the value of C changes which does happen.
In case of work temperature rise or in case of ageing the timing is going to change ,we will see this we get a timing of about 0.5 seconds here based on these values you can always calculate and then find that every time we trigger the pin number 2 we get this kind of timing within seconds at that point we get 0.5 five seconds as compared to the digital type where we had used a microcontroller 8051 series the simplest microcontroller and we have similarly an arrangement here for the.
Triggering and then the program is then written and while we operate this and what we notice we get roughly the same timing based on whatever program we have written but the beauty with this is since this is program based and the time difference is taken from crystal connected here of course that a standard connections which are missing here which the though the software doesn't require such kind of things otherwise the crystal used here is 11.0592 MHz crystal very high frequency crystal and in that time is divided out of this particular.
Crystal frequency so the timing that be get here would be a most impossible to change over decades of use that's the biggest advantage of program based compared to the analog type and if we look at the program a this is a c program and embedded C we call it we start from here and then let me go on I will scroll it down so that it would like to refer to it it or like to note it down ,you can do it so and we go on like this and finally.
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