Battery Charger Circuits, page 1 - free electronic circuit links


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Battery Charger Circuits
Battery Charges Alkaline Lead Acid Lithium Nickel
Last Updated on: Friday, April 25, 2008 04:02 PM

Circuits Designed by Dave Johnson, P.E. :

Candle Power: A single lit candle in conjunction with an inexpensive thermopile voltage generator provides enough power to charge a small battery when used with a small low voltage DC to DC converter.

Two 12v Battery Isolator: Linear Technology has just announced a neat little chip (LTC4412). It has been designed to be used in conjunction with an external P-channel power FET, to form an ideal diode function with a very low 0.05v voltage drop. The chip monitors the voltage on either side of the FET. As long as the voltage on the drain side is greater than the source side, the FET is turned on....

Solar Powered Lithium Ion Battery Charger NEW
The circuit below feeds a controlled current and voltage to a 3.6v lithium ion battery. The current is limited to 300ma and the voltage is limited to 4.2 volts. The circuit uses a LTC1734 IC from Linear Technology. No diode is needed between the circuit and a 6 volt solar panel....

Links to electronic circuits, electronic schematics, designs for engineers, hobbyists, students & inventors:

Amplified Zener: A 13 volt Zener diode will work well for charging a 12 volt battery on Standby use. Or use a 14 volt zener a diode for a Standard 14.6 volt charge…. (circuit / schematic design added 10/06)

Battery Charger: Current and Voltage Regulated for Sealed Lead Acid types (electronic circuit added 10/06

Battery Discharge Monitor: (schematic / circuit added 10/02)

Battery Equal Charge Indicator: (circuit / schematic design added 6/06)

Broken Charger-Connection Alert: Detects if a device is not properly connected to its supply. Suitable for battery chargers, portable appliance supplies etc. (added 3/050

Charge Monitor for 12 Volt Rechargeable Lead Acid Battery: (electronic Circuit / Schematic added 10/04)

Motor Accu Lader: Electronic circuit (added 9/04)

Muscle power drives battery-free electronics: 11/21/05 EDN Design Ideas / (added 10/06) Your sweat and a super-cap replace the battery.

Nicad Battery Charger: (schematic added 10/06)

Picref-5: Smbus Level-3 Battery Charger/Selector Reference Design Based on the PIC16C73a: Microchip Application Note Published 11-May-98 (app note added 2/06)

Salt Water Battery: (electronic circuit added 10/05)

Solar Cell Battery Charger: (electronic circuit added 10/06)

Step Up supply charges battery while serving load : The circuit in Fig 1 supports portable applications in which a microprocessor controls battery charging. Step-up switching regulator IC1 boosts VIN (5V) to supply a combination of charging and load current. (Note that the 5V source must have short-circuit protection.) IC2 is a high-side current-sense amplifier that monitors charging current. Commands from the processor are CHARGE ON /OFF and FAST/TRICKLE CHARGE 06/08/95 EDN-Design Ideas / (added 11/05)

The Amplified Zener: A 13 volt Zener diode will work well for charging a 12 volt battery on Standby use. Or use a 14 volt zener a diode for a Standard 14.6 volt charge…. (circuit / schematic design added 10/06)

Zap Adapter: "Don't throw away those seemingly un-chargeable, rechargeable batteries; they could very well be brought back to life with the aid of this simple circuit." (circuit added 9/04)

Battery Charges Alkaline Lead Acid Lithium Nickel