I have been trying to find the best way to measure 3 phase power for my thesis. My thesis works with RC hobbyist size BLDC motors. I am looking at better modeling the speed controller's efficiencies. Therefore I am measuring the DC power in and the AC power out.
The AC power out is:
Voltage unipolar square-wave
3 phase with no common ground
motor takes about a 6-8 kHz signal frequency
But the Speed controller has a switching frequency of 12 kHz
I can reduce said Vrms limits and Irms limits to achieve better accuracy.
I looked into the ADE 7762 but its Bandwidth looks too small.
Suggestion on which units I should use?
Hi Clayton Green
Almost all of the energy metering and monitoring products (ADExxxx) are targeted at working with 50/60Hz fundamental signals and within 2KHz/3.3KHz bandwidth, to compute powers. Only a very few parts like ADE7762 work with a 14KHz bandwidth. But working with PWM signals is not common. How much bandwidth are you looking for?
Also, the ADE ICs work well with sine waves and bipolar inputs. For square waves and unipolar signals, I need to understand your expectations and application scope a little bit more and work with you to resolve the differences.
Before that, I would recommend that you also post this question in the ADC community to see if you can get an apt ADC with desired bandwidth. If not, you can always come back here and post your proposed system level block diagram and state your expected bandwidth along with what you are trying to measure (with accuracy expectations).