Skip to content
New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Jump to bottom

DC bus current sensing #2

Open
2 tasks
FedorBel opened this issue Mar 28, 2021 · 6 comments
Open
2 tasks

DC bus current sensing #2

FedorBel opened this issue Mar 28, 2021 · 6 comments
Assignees
@FedorBel
Labels
Feature

Comments

@FedorBel
Copy link
Owner

FedorBel commented Mar 28, 2021 •
edited
Loading

How to measure dc bus in a 3-phase half bridge inverter.

  • Measure using shunt + op-amp
  • Measure using Hall Effect-Based ACS712
@FedorBel
Copy link
Owner Author

Article from STMicroelectronics on low-side current sensing using shunt resistor and op-amp.

@FedorBel
Copy link
Owner Author

image

@FedorBel
Copy link
Owner Author

Or just use ACS712 5A current sensor.

@FedorBel FedorBel mentioned this issue Mar 29, 2021
Closed
@FedorBel FedorBel self-assigned this Apr 3, 2021
@FedorBel
Copy link
Owner Author

Measuring with ACS712 5A is not very good.

image.png

In fact, i only need to measure 0-4 A, there's less then 1v dif when measuring (not stable supply voltage can end with bad results).
Better build shunt + op-amp sheme.

@FedorBel
Copy link
Owner Author

FedorBel commented Apr 18, 2021 •
edited
Loading

  1. Advice on Current Sensing for new board design.
  2. Current Sensing Tutorial.

@FedorBel
Copy link
Owner Author

FedorBel commented Apr 18, 2021 •
edited
Loading

Current-sense amps:

  1. INAx180
  2. INAx181 - bi-dir
  3. INA381 - amp+comp
  4. INA250 - shunt+amp

Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment
Assignees

@FedorBel FedorBel

Labels
Feature
Projects
None yet
Milestone
No milestone
Development

No branches or pull requests
1 participant
@FedorBel