Power charging circuit

zk643

Power charging circuit [Copy link]

 

I want to make a charging circuit to charge 1860 batteries using a TYPEC interface. Since there are many types of chargers, I want to implement a charging circuit that can adapt to a wide range of voltages to protect the subsequent circuits. Has anyone used such a circuit?

chunyang

There are many types of chips for charging single-cell lithium batteries, including switch type and linear type. Choose according to the input voltage range you need. However, the packaging of many lithium battery charging chips requires certain manual soldering skills, such as QFN, so be careful to choose what you can handle. Another option is to use a finished charging board, which is available in large quantities on Taobao.

qwqwqw2088

You can make one yourself using the TP4056 chip, or as mentioned above, you can buy a ready-made one from Taobao.

When you first start playing, don't charge too much current.

dcexpert

If it is a single-cell 18650, the simplest way is to use 4056, or a mobile power motherboard, the prices are very low, and the mobile power motherboard has a larger charging current.

zk643

chunyang posted on 2022-2-8 14:40 There are many types of chips for charging single-cell lithium batteries, including switching and linear types. Choose according to the input voltage range you need. However, many lithium batteries...

My product is powered by five 1860 batteries in parallel and charged with a TYPE-C interface. I want this circuit to be able to adapt to various chargers, no matter how fast or slow the charging is, it will not affect the circuit.

se7ens

Just look for a power bank motherboard with a TYPEC interface on TB.

Or DIY your own charging chip

If TYPEC does not support the protocol, the default output is 5V

chunyang

zk643 Published on 2022-2-9 08:37 My product is powered by five 1860 batteries in parallel and charged with a TYPE-C interface. I want this circuit to be able to adapt to various chargers, regardless of fast...

You should have made it clear from the beginning that multiple batteries connected in parallel must have a current balancing system, and charging management will also be troublesome. Neither single-cell nor multi-cell series connection solutions can be used, as the nature is completely different.

You can check out the parallel charging and battery management solutions on the official websites of LT and TI, but the devices may not be easy to get. Another solution is to use MCU + precision ADC, which will take a long time to develop. If you want to adapt to the full range of mobile phone fast charging power adapters, you can only use the MCU solution.

zk643

chunyang posted on 2022-2-9 10:49 You should have made it clear from the beginning that multi-cell battery parallel power supply must add a current balancing system, and charging management will also be very troublesome. Single-cell and multi-cell series solutions are not useful...

Oh, I remember there were several chargers that were specifically designed to charge 18650 batteries side by side. Is there a current balancing system there? I really want to know about USB Type-C and the power delivery protocol.

chunyang

zk643 posted on 2022-2-10 15:13 Oh, I remember there were several chargers that were specially designed to charge 18650 batteries side by side. Are there current balancing systems there? I really want to think about it now...

Independent chargers are either multi-way charging circuits, or single-way charging circuits in series, or multi-way charging circuits in series. There is no parallel charging. It is very troublesome to handle batteries in parallel. Just look at the power management system of electric cars. Moreover, charging within the system is much more troublesome than independent chargers, especially when there is parallel connection, which is very technically challenging.

chunyang

It is simpler if you only connect single cells in parallel, and do not connect multiple cells in series. Each cell must have MOS control and independent voltage sampling. In fact, the charging management is to make multiple semi-independent charging, but this requires parameter matching of the batteries.

zk643

chunyang posted on 2022-2-10 15:32 It is simpler if you only connect single cells in parallel, and do not connect multiple cells in series after parallel connection. Each battery cell must have MOS control and independent voltage sampling, and charging management is actually...

Any recommended chips?

chunyang

zk643 posted on 2022-2-15 13:14 Do you have any recommended chips

Most MCUs can do it. If a more sophisticated ADC is needed, it can be external or internal. If it is internal, there will be fewer MCUs to choose from.

zk643

dcexpert posted on 2022-2-8 15:55 If it is a single-cell 18650, the simplest way is to use 4056, or a mobile power motherboard, the prices are very low, and the mobile power motherboard has a larger charging current. ...

Its current is only 1A. I want to charge five 18650 batteries in parallel. This current is probably too small. Do I really need one charging chip for one battery?

dcexpert

zk643 posted on 2022-2-16 08:54 Its current is only 1A. I want to charge five 18650 batteries in parallel. I'm afraid this current is too small. Do I really need to use one charging chip for one battery...

There are charging chips with higher current, 4056 is just very cheap, and generally a mobile power bank can charge up to 2-3A.

zk643

dcexpert posted on 2022-2-16 09:01 There are charging chips with higher currents. 4056 is just very cheap. Generally, mobile power banks can charge up to 2-3A.

Is there a 5A?

dcexpert

zk643 posted on 2022-2-16 11:33 Is there a 5A?

The forum in the previous year, Nanxin event, had high-power

http://www.southchip.com/products.aspx?TypeId=107&fid=t3:107:3

dcexpert

zk643 posted on 2022-2-16 11:33 Is there a 5A one?

The forum is holding an ongoing MPS event, and there are also many high-power charging chips.

https://www.monolithicpower.cn/cn/products/battery-management/chargers.html