Author Topic: Load cell design, will this work ?  (Read 575 times)

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Offline opa627bmTopic starter

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Load cell design, will this work ?
« on: May 08, 2020, 05:27:50 am »
Hi all,
I am trying to do a load module that is capable of doing 100~640A load step @ 1600A/us

I am doing 16 individual load cells , and each of them is helping with 40A peak and ~ 10A TDC.

2 of the load cell will be grouped into a load bank, and we will have 8 load bank current reporting to the MCU(due to limited channel)

I am trying to avoid using the summing amplifier at current sense stage (since i have to combine 2 current signals from the 2 CSR into 1 so i can report back to the MCU) and is trying to combine 2 load cells CSR reading through 1 current sense amplifier.

My question is, will this work? will the 2 opamp fights eachother because one opamp can clearly affect the current sense read back , and thus cause another opamp to take action, and may ended up in oscillation ?

thank you

Regards,
Li

 

Offline Vovk_Z

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Re: Load cell design, will this work ?
« Reply #1 on: May 08, 2020, 11:54:56 am »
They won't fight.
Here is some more information about fast electronic loads (maybe you've seen that):
1. Design a 100a active load to test power supplies
2. A Closed-Loop, Wideband, 100A Active Load
 


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