Microchip announced the expansion of its analog power-management family with the MCP73831 battery charger, a fully-integrated, single-cell, Li-ion/Li-Polymer charge-management controller. Tiny 500mA linear charge management controller can be powered directly from the USB port. Includes integrated pass transistor, current sense and reverse-discharge protection, the MCP73831 charger reduces the number of components needed for battery-charger designs. Its highly accurate, pre-set voltage regulation (maximum accuracy 0.5 per cent to 0.75 per cent) results in more fully charged batteries and extended battery life. Since the MCP73831 charge-management controller includes a pass transistor, current sense and reverse-discharge protection on a single chip, it reduces the number of system components needed for battery-charger designs, which, added Microchip, lowers overall system costs.
Microchip’s Li-ion battery charger MCP73831 IC – [Link]
The circuit can be used to charge 12V lead acid batteries.
Pin 1 of the LM317 IC is the control pin which is used to control the charging voltage, Pin 2 is the output at which the charging voltage appears, Pin 3 is the input to which the regulated DC supply is given.
Battery Charger Circuit – [Link]
This project is an intelligent battery charger based on PIC16F628.
PIC16F628 intelligent battery charger- [Link]
Check out the MAX8934G dual-input Li+/Li-Poly linear battery charger: [via]
- Monitors temperature to ensure safe charging and JEITA battery charging specification compliance
- Delivers smart power path control to allow the system to be powered when the battery is completely dead
- Charges safely by lowering the termination voltage and charge rate in hot or cold temperature
- Includes all integrated MOSFETs
MAX8934G dual-input linear Li-Poly battery charger – [Link]
Interesting article from IEEE Spectrum about the potential benefits of developing a usefully rechargeable lithium-oxygen cell (for use, most importantly, in electric cars) and the challenges that remain for that research. So-called “air batteries,” in which one of the reacting chemical species is atmospheric oxygen, are already widely employed, for instance, in hearing-aid batteries, which are commonly zinc-air cells with a piece of adhesive film that must be removed before use to allow atmospheric oxygen onto the cathode. The know-how to make lithium-air cells is available right now; the hard part is making the reverse process practical over many recharging cycles. [via]
The quest for a rechargeable lithium-air battery – [Link]
This Valentine instructable shows a pair of Hearts that unite to become one! The homopolar motor is the simplest form of electric motor, consisting of a battery, a conductor, and a magnetic field. The flat Heart shape is the most basic of homopolar motors. The Heart with legs is the next most simple shape. With a little ingenuity, the two shapes can be combined to unite into one spinning body. In this Instructable, I show how to make this special 2-piece homopolar motor with a bass speaker, some coins, a battery and two pieces of copper wire. A neodymium magnet can also be used instead of the bass speaker and coins. This is a great display for Valentines Day…or any day of the year!
How-To: Valentine motor - [Link]
This device allows solar cell arrays to be connected to either conventional lead-acid, sealed lead-acid, or lithium storage batteries without fear of overcharging. It allows two different electrical loads to be driven from the batteries at two different charge states to maximise power usage efficiency.
Photovoltaic Solar Battery Regulator and Load Controller – [Link]
This battery charger is for 12V Sealed Lead Acid (SLA) battery. It is actually a half-wave rectifier. It only charges the battery on every half cycle.
12V Battery Charger for Sealed Lead Acid - [Link]
Nikolaus Gradwohl needed some battery packs to power his devices so he wrote a openscad-script that generates battery compartments. The software handles various battery types from AAA to D and can generate compartments for even and odd battery numbers. The devices are printable and the only thing you need to add are little metal stripes for the contacts. [via]
Print your own battery compartments - [Link]