Hi,
My name is Idan and I'm electronic engineering at the Israeli Aerospace Industry.
In my application I have I have to use isolated shunt resistor in order to measure the input current for a full bridge inverter (with inductance load). The current range is 0.1A-4A and the phase voltage is 300V. I think I that can use the AMC1100 Fully-Differential Isolation Amplifier for the current measurement. In your web side I found the "Isolated Current and Voltage Measurement Using Fully Differential Isolation Amplifier", TIDA-00555 Card/system (attached herewith) that might be perfect to me. In order for me to use the AMC1100 in my project (in quantity of a hundreds), I really need for you to answer the following questions:
- In Figure 1 of the TIDA-00555 block diagram it seems like the current shunt is located on the high-side on the ~300VDC (230VAC). The problem is that according to the datasheets, the amplifier VCM is only –0.16 to VDD1 (Basically allow only low- side shunt measurement). Am I right? You can see this repeated principle in Figure 36. The AMC1100 in an E-Meter Application in the AMC1100 datasheet (High side measurement using AMC1100, assuming that L1-L3 in larger then VDD1A-VDD1C respectively?
- If I'm right about the first question, is it possible to use the AMC1100 in the low side instead?
- In the TIDA-00555, you mentioned that the TIDA-00555 design can also be used to measure DC or a 400-Hz signal. Why is that? According to the AMC1100 datasheet, the input bandwidth is 60 kHz min. Can I use this amp to measure signals at ~30kHz for example?
- Can I test the current monitoring principle on the AMC1100EVM?
- If this amplifier is not suited to my application can you suggest a different device (to ether/ both high side or low side measurement, Isolated)
Thanks a lot,
Idantidua58.pdf