usb li-ion battery charger - lithium ion polymer battery

This is a lithium-ion battery charger that takes power from the USB port of the computer.
It uses MCP73861 or MCP73863 Li-
Ion battery charger chip made of microchips.
An edge connector is cut off from an old Ethernet card and used as a power connector.
To make it, cut off a piece that includes four edge fingers and then archive it to fit the USB connector on the PC.
The circuit board is a single-sided copper-clad board.
It has a hole inside so that it can hold the integrated circuit.
MCP73861 or MCP73863 (
They are similar, with only slight differences that do not affect the circuit connection)
Available in a small lead-free package. The difficulty?
There is no welded lead. The advantage?
No clue to break!
Place the ic to connect it to the side (
Side with pad)
Align with the copper side of the plate and then fix it in the appropriate position with epoxy or similar glue.
The area around the Ic is a tin plate, and the pad is connected to the board with a small amount of wire.
I found it helpful to flatten the wire with pliers before welding so that it doesn't have any tendency to roll.
Some leads point to the same node, which is easily put together.
After all the leads are welded, the space between the leads is cut into islands, and other components are welded to these copper islands.
Various components detailed in the Ic data table (
Can be obtained from the website of micro-chip technology)
Then Weld in place.
The two LEDs are new.
All other components have been removed from the old hard drive.
The red led should light up to inform us of the error.
Another green LED (
Clear in the figure)
The light is on, indicating that it is charging.
At the end of the charge, according to the last digit of the ic part number, it will flash or go off.
The motherboard is done and all that is left is connected to the battery and the power supply.
If the source voltage is much higher than 5 v, the radiator may have to be welded to the heat pad of the chip to charge without interruption due to overheating of the chip.
Complete thermal overload protection.
If required, the battery can also be protected using a thermal resistor in contact with the battery.
Battery overheating protection is not included in my circuit version.
It is connected to the USB plug so that it can be plugged into the USB port of the computer as a unit, as well as the battery connected with a wire.
The supply voltage is 5 v and the maximum current is 500 mA. overheating of the chip is unlikely to be a problem.
Shows the charger trying to charge the phone's battery. Li-
There are many flavors of ion batteries
Single battery, double battery, Coke anode, graphite anode, etc.
Each must be charged to a specific voltage.
Low voltage can lead to insufficient charging, resulting in the full capacity of the battery not being utilized.
Overcharge the battery, even if it is only 0.
1 V, according to a manufacturer, causes the battery to "disassemble spontaneously ".
This means that it can explode, catch fire, and potentially cause personal injury.
Take the risk of using this line on your own.
The data sheet of the chip provides information on configuring the chip to cope with different types of batteries, and is an important document for using the chip.