CCS/TMS320F28379D: Hysteresis current control

Nikola Djordjevic

Part Number: TMS320F28379D

Tool/software: Code Composer Studio

Hello,

I should work on hysteresis current control for three phase grid connected inverter (2 comparators per each phase), so I need 6 comparators. I found that 28379D microcontroller has 8 WINDOWED comparators.

My question is, could I use internal DACs to program upper and lower boundary for current (hysteresis gap) for all three phases with that 12bit WINDOWED comparators? I should to generate sinusoidal boundaries on frequency of about 10 kHz.

I know that PICCOLO 28027 and 28035 have two 10bit comparators with programmable internal DACs, and they can do that but for only one phase (for one phase application, signal from current sensor is connected on + pin, but on - input of comparator upper of CMP1 and lower boundary of CMP2 from internal DACs are connected)

Thanks in advance!

Nikola.

over 8 years ago

0 Frank Ankapong over 8 years ago

TI__Mastermind 28275 points

Hi Nikola,

Yes, the 28379D device has 8 comparator subsystems and each of those subsystems has 2 comparators and 2 dacs. Each subsystem is capable of window tripping.

If i am understanding your question correctly, the 28379D should meet your needs. You can use the 2 dacs in each subsystem to program the upper limit (for high comparator) and lower limit (for low comparator). The signal that you are tripping on then goes to the positive input of both high and low comparators. The comparator should have no problem tripping at signals around 10 KHz.

0 Nikola Djordjevic over 8 years ago in reply to Frank Ankapong

Prodigy 220 points

Thanks a lot!

Regards,
Nikola.

0 Frank Ankapong over 8 years ago in reply to Nikola Djordjevic

TI__Mastermind 28275 points

Glad i could help. Let us know if you have any more questions.

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CCS/TMS320F28379D: Hysteresis current control