TL431 12V Battery Charger Complete

Completely tested and working. Schematics:
www.bristolwatch.com/ccs/tl431...

[@jp040759]

Cool application of the opto in the circuit. Simpler than designing a non isolated circuit. Saves on calculating many circuit interactions.

[@qzorn4440]

A most interesting battery charger video. Thank you.

[@LewisLoflin]

Thank you!

[@lawalmohammed83]

Please Sir what modifications could be made to charge 4 lithium ion battery (16.8V) in series?

[@LewisLoflin]

The voltage is too high.

[@LewisLoflin]

Related:
www.bristolwatch.com/ccs/tl431_ccs4.htm TL431, LM317 Battery Charger Circuits Schematics
www.bristolwatch.com/ccs/LM317b.htm LM317 High Power Constant Current Source Circuit
www.bristolwatch.com/ccs/tl431_ccs3.htm Power TL431 Constant Current Source Circuits
www.bristolwatch.com/ccs/lithium_charger.htm TL431A Lithium-Ion Cell Charging Circuits
www.bristolwatch.com/ccs/lithium_charger2.htm Charging Multi-Cell Lithium-Ion Battery Packs
www.bristolwatch.com/ccs/tl431_ccs1.htm TL431 Over-Voltage, Under-Voltage Detector Circuits
www.bristolwatch.com/ccs/tl431_ccs2.htm TL431A Constant Current Source Working Circuits Demo
CZcams:
czcams.com/video/PvhyJXUhlKI/video.html TL431 Under-Voltage, Over-Voltage Detection
czcams.com/video/y2gnZ7HZefc/video.html TL431 Constant Current Source Circuits
czcams.com/video/kJUit6XQYKE/video.html TL431A Lithium-Ion Cell Charging Circuits
czcams.com/video/jVXmL7HThiM/video.html TL431 Battery Charger Circuit Calculations Revised
czcams.com/video/Fr0Zir8UCLs/video.html TL431 10-Volt Charger Short Version
czcams.com/video/gg0Tux_pAgk/video.html Charging, Charge-Balancing 18V Li-Ion Battery with TL431
czcams.com/video/QfXS70Kwx94/video.html 18.5V Li-Ion Battery Charger with TL431 (short)
www.bristolwatch.com/ele4/ccs_lm358.htm Arduino Measures Current from Constant Current Source
www.bristolwatch.com/ele4/css.htm Constant Current Source Theory Testing
www.bristolwatch.com/ele4/ard_css.htm Arduino Controlled Power Constant Current Source

[@quantizedtech2170]

What modifications can be done to get 20A out of the circuit to be able to charge 200AH lead acid battery

[@LewisLoflin]

That TL431 CCS is limited to ~1.5A. I have another circuit coming up that could handle higher currents.

[@alisolar4156]

My version 6 amp tl431 based @@LewisLoflin