18W QC3.0 compatible powerbank - Page 1
Forum section: electronics / projects

author: redgear
author_rank: Frequent Contributor
timestamp: October 18, 2019, 09:30:25 am
content: Hey all,I want to build a 18W QC3.0 compatible powerbank, while there are already many options available in the market I want to take up this project as it will help learn something new...There aren't many reference designs online(available for QC3.0 for wall chargers but not for powerbanks).What would be the major components required?1)Battery Gauges(bms)2)Battery Charge Controller3)QC3.0 compatible USB Type A controllers4) A 8-bit MCU to read the SOC information from gauge and display it to a numerical lcd5) Numerical LCDI am looking at Ti product offerings for the charge controllers and battery gauges. I am not able to find any QC3.0 compatible controllers. Would be great if I can get some recommendations.Since the Battery Gauges will be providing OC,OV,UVLO,OT protections, can I pick a usb controller without the protection features?What else should consider?Thanks

author: redgear
author_rank: Frequent Contributor
timestamp: October 23, 2019, 11:49:51 am
content: BUMP

author: OwO
author_rank: Super Contributor
timestamp: October 23, 2019, 11:57:57 am
content: IP5328 does everything in one chip; if you really want to implement everything yourself I recommend skipping the BMS and using a simple protection IC. You only just need a charger, protection, dc-dc boost, and qc3.0 protocol chip.

author: redgear
author_rank: Frequent Contributor
timestamp: October 23, 2019, 12:12:52 pm
content: Quote from: OwO on October 23, 2019, 11:57:57 amThanks. I check the IP5318 and IP5310, the documentation isn't in English and I am not able to understand anything. I am planning to use a TI's battery gauge since it is more reliable. Can I just stick to the protection features in the IP53xx SOCs?Can you please share datasheet of the IP5328 in English? Is there a reference design I can look at?

author: OwO
author_rank: Super Contributor
timestamp: October 23, 2019, 02:10:34 pm
content: For lithium battery protection just a dw01 and two mosfets will do. I checked and there aren't English datasheets for the ip53xx, but you can try google translate. These chips don't need much external parts and the example schematic in the datasheet should work fine.As to battery gauging I've found none of the coulomb counting based solutions work satisfactorily and the most reliable way is simply sensing the voltage (and possibly applying a correction based on current draw). Sure it won't be as accurate but it won't tell you the battery is 30% full and then cut you off a minute later.

author: redgear
author_rank: Frequent Contributor
timestamp: October 24, 2019, 09:09:16 am
content: Quote from: OwO on October 23, 2019, 02:10:34 pmI just checked the IP5322 datasheet, it charges the batteries to 4.2v and discharges till 3v, but I am planning to use only 3.1-4.1v range for extended life. Can I use a Ti battery charger and protector and use IP5322 for Boost and Qc3.0 protocol? In this case can I connect my discharge FET to the BAT(battery postive) of my IP5322? Can the pins corresponding to Micro USB be left floating on the IP5322?Thanks