CN3085 nickel-metal Hydride battery charger transformation

Problems with the original charger:

1. Low charging current: each group has a 1/4W resistor current limit, and the current of 4 batteries charged together is less than 300mA.

2. Voltage range: Because it is a direct charge after the transformer rectifier, the voltage range can only be 220V, and the charging stop voltage is also affected by the fluctuation of the mains, not to mention the place where the 110V mains is charged.

3. Waste socket: such a little current also takes up a bit of me?

It's not filtered yet, but pulse charging, right?

With CN3085 as a charging chip, a Taobao is about 1 piece of free shipping, resistance and periphery are commonly used values, packaging 0603, the total cost does not exceed 6 yuan.

Powered by TypeC. Try to choose a thin board for proofing, and you can understand it, because the height of the original notch is not the same, and you can't do it on a board.

The maximum charging current of a single section of this circuit is about 5V400mA, and the external resistance value can be modified as needed (refer to the manual), as long as it does not exceed 1C. The total charging current is about 5V1A.

By the way, let's test the two batteries.

"Sony" nickel-metal hydride battery, with a nominal capacity of 4600mAh, was purchased at 10 yuan for 4 in the seafood market.

Double nickel-metal hydride battery, nominal capacity 1200mAh, Taobao purchased 4 11 yuan.

There was no capacity test, and the internal resistance was simply measured.

The Sony model certainly does not have the exaggerated capacity as the nominal one, but when the voltage ratio is low, the internal resistance can be lower than the multiplier. At least the Sony model is still worth buying.