Inverter current/voltage sensing

Anand Lobo

Other Parts Discussed in Thread: DRV401, AMC1200, TMS320F28069

I posted this question in the Power Management forum without thinking. I believe this forum is more relevant.

I'm working on implementing current / voltage sensing for a (hopefully grid-connectable) 250W solar micro-inverter. Planning to use SM73308 for the PV panel DC measurements, but I am unsure what is the optimal component for measuring the AC output; I presume magnetic sensing would be better in terms of electrical isolation. I am in India, where mains power is 220V / 50 Hz.

Guidance is appreciated, as electrical hardware/power is not my main field.

Thanks,
Anand Lobo

over 10 years ago

0 Jose Duenas over 10 years ago

TI__Genius 9975 points

Hello Anand,

There are two parts I would recommend for isolated current measurement on the AC side of the inverter: AMC1200 (http://www.ti.com/product/amc1200) and DRV401 (http://www.ti.com/product/drv401)

The AMC1200 is an isolation amplifier that interfaces to a shunt resistor, the DRV401 interfaces to closed loop-magnetic current sensors.

Best,

Jose Duenas

0 Anand Lobo over 10 years ago in reply to Jose Duenas

Prodigy 140 points

Hi Jose,

Thank you, I believe I will go with the AMC1200 for simplicity.

Based on the solar micro-inverter block diagram (http://www.ti.com/solution/solar-micro-inverter-diagram), could you advise me if the components I've chosen (marked in the attached image) will be an effective solution? The solar panel I'll be using is this: www.moserbaersolar.com/resources/MBVP-CAAP-BB-english.pdf (245 Wp)

0 Jose Duenas over 10 years ago in reply to Anand Lobo

TI__Genius 9975 points

Hello Anand,

Your selections seem appropriate. One component that you will need as well is a microcontroller to run the PLC communication protocol. In our TMDSPLCKIT-V3 (http://www.ti.com/tool/tmdsplckit-v3) we use the TMS320F28069.

Best regards,

Jose

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Inverter current/voltage sensing