Hand Drill Battery Charge Controller with PIC16F88 Microcontroller

It has many features such as charging screwdrivers, which are frequently used in technical services, programming a charging circuit designed for drills, and temperature control with LED indicator. Micro Controller PIC16F88 used in charge control circuit

Charge Controller for Cordless Tools Protect your device and extend the life of your power tool’s rechargeable batteries.

Charge control circuit specifications

Charge timeout
Minimum and maximum temperature monitoring
dT/dt charged detection
Over and under temperature detection
Power, charge and thermistor indicator LEDs
Adjustable timeout limit
Adjustable dT/dt setting
Optional and adjustable high and slow charging

While these battery powered tools are useful, they are not very advanced in battery charging systems.

Most low-cost power tools include a very basic charger: a plug pack to supply power and a resistor to limit current flow to the battery. There is nothing to prevent overcharging: no timer to turn off charging when time is up, and no full charge detection.

At best, this type of basic charger shortens the life of the battery so it only needs to be replaced after relatively few charges. At worst, the base charger can destroy the battery pack the first time it is used!

If the charger is left on for too long after the battery pack is fully charged, destruction of the battery pack may occur. And it’s easy to forget to turn off the charger whenever you want. The result is severe overcharging.

You can’t even count on the fact that charging takes a certain amount of time and after that the charger can even be turned off, because the time required for a full charge depends on the state of charge of the battery pack at the start of charging.

Source: http://www.siliconchip.com.au/cms/A_108146/article.html

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