Battery Tester

• Constant Current load (analog control loop MOSFET, OpAmp, current sense feedback loop)
• Low-side (simpler) versus high-side current sense
• Constant-current discharge
• Measure battery voltage
• Measure discharge current
• Cut-off voltage
• Temperature sensing
• Discharge profiles
• Reverse polarity protection
• Input fuse

• target common chargers/banks: 5/9/12/15/20 V, up to 3 A (standard power range)
• current-sense IC
• TO-247 (or similar) MOSFET chosen for DC SOA
• https://jasper.sikken.nl/electronicload/index.html
  • Single MOSFET, low-side sense
• https://www.smbaker.com/raspberry-pi-controlled-dc-load
  • web server that can be used to operate the project from a desktop PC or a mobile device
  • 3 MOSFETs in parallel
• EEVblog #102 - DIY Constant Current Dummy Load for Power Supply and Battery Testing
• EEVblog 1688 - Constant Current Sources EXPLAINED + DEMO
• Great Scott DIY Adjustable Constant Load (Current & Power)
  • MOSFET: IRFZ44N
  • Current Sense IC: AC712
• https://www.mouser.com/pdfdocs/DC_Electronic_Load_Application_Note.pdf
• IXTH75N10L2 linear FET, IRFP250N
• https://www.youtube.com/watch?v=NScaRQj53l0
  • https://github.com/Dominik-Workshop/electronic-load
• Electronic DC Load by Scullcom Hobby Electronics