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[SOLVED] Invert the outputs of DSPIC30f3010

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Mohammad Zubair

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Hi, I am using dspic30f3010's PWM in complentary mode. I want to invert both the outputs i.e. PWM1L and PWM1H from the coding. It is the requirement of my hardware. I have gone through its datasheet but I have not found a definitive solution to invert the output.

Please do guide. Thanks in advance
 

You want it to be done in code ? That is you want ON time and OFF time to be inverted ? Can you do it in hardware using a NOT gate ? If you have to do it in code then you have to change the duty cycle like if you want 80% ON and 20% OFF to be converted into 20% ON and 80% OFF.
 

Yes I do want to do it in the code. I am using PWM modules of DSPIC30f3010. It will have to be some bit or some value in the PWM registers but I am not sure how to do it

No, NOT gate is causing problems at this high frequency switching so I will have to do it in the code

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Yes I do want to do it in the code. I am using PWM modules of DSPIC30f3010. It will have to be some bit or some value in the PWM registers but I am not sure how to do it

No, NOT gate is causing problems at this high frequency switching so I will have to do it in the code
 

Please zip and post the complete project files. I will have a look at the code and check the datasheets and see what duty cycle the code is generating and I will tell you what values you should use for PWM registers to get the required duty cycle.

This might help you.

https://www.mikroe.com/chapters/view/54/chapter-6-output-compare-module/#ch6.4.2

PRx registers are used to set the duty cycle.
 
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Hi,

If you just use the 100% -x% code solution:
Check if there is any adjust on deadtime necessary.

Klaus
 

Hi
Thanks a lot to everyone, I had some idea that I had to do it with some configuration bits but I was not aware of the exact macros until I found out that we could learn about the macros in its header files.
 

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