+5v Powered Charge
Pump Battery Charger - The circuit below will trickle
charge a four cell pack of AA or AAA NiMH batteries. The circuit draws current from the +5v available a USB
connection and pumps about 70ma of current into the battery. This should be enough current to fully charge a pack
of . . . [Circuit by Dave Johnson P.E., 02/07/10]
6v NMH/NiCd Battery Tester - I designed this circuit to test rechargeable six volt battery packs under constant current
conditions. As designed, the circuit applies a 10 amp load to the battery pack. A heat sink must be used on the
main power transistor . . . [Circuit by Dave Johnson P.E., 12/12/04]
A High Speed NiCd Charger for Electric
R/C - A few years back, I published a design for a Low
Cost Thermal Peak Detection Charger. Since then, I've designed several other chargers, in my ongoing quest to
avoid having to spend money. Of course, in building all these designs, I've probably spent more than a really
good commercial charger would have cost me. But designing and building is half the fun. . . [Stefan Vorketter]
AA Battery Solar Charger - This almost trivial circuit may be used to charge a pair of AA or AAA sized cells insun. .
. [(C) G. Forrest Cook 1999]
AN2 Portable Ni-Cd Battery Charger:
Inexpensive Load Tolerant Step-Up Energy Source - Zetex
Semiconductors Applications Note: A relatively simple low parts count topology is presented for a one
transistor design, that allows "in field" re-charge of Ni-Cd battery packs from a convenient energy source such
as an automotive battery. The note includes transformer design and winding details. Though designed for a
specific case, circuit and principle employed should lend itself to many or applications. . . .
AN26 Fast Charging Batteries with Zetex
High Current PNP Transistors & Benchmarq Controller ICs -
Zetex Semiconductors Applications Note: High current, fast switching PNP transistors are capable of replacing
large packaged P-Channel MOSFETs, when attention is paid to base drive requirements. This enables space and
performance efficient designs at much reduced cost. . . .
AN667:
Smart Battery Charger with Smbus Interface - Application
Note Published 26-Aug-97. . . [Microchip]
AN960: New Components & Design Methods Bring Intelligence to Battery Charger
Applications - Application Note Published 19-Nov-04. . .
[Microchip]
Automatic
3-Phase Induction Motor Starter - The starter circuit
presented here offers two main advantages: single-phase prevention and automatic star-to-delta conversion. . . .
[© EFY Enterprises Pvt. Ltd. All rights reserved.]
Automatic
AA Charger - Rechargeable batteries are very popular for
use in all sorts of devices, especially those requiring a high current. The most common type of cell is the AA or
penlight and although thousands have been sold, there are very few low-cost chargers to keep them in tip-top
condition. Most of them simply charge them at the slow rate and never turn off, you have to remember. . .
[Collin Mitchell's web site]
Battery (NiCad) Rejuvenator - 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. (Tony van Roon's Tony van Roon) . . . [Tony van Roon's circuit]
Battery Charger Indicates Rate of Charge - 05/25/95 EDN Design Idea A single LED indicates wherbattery Chargers
delivering a
trickle charge or a fast charge, Circuit designed to charge2-14 cells. . . . [by Larry Suppan, Maxim Integrated
Products, Sunnyvale, CA]
Battery Charger Takes on Two Roles - 01/01/98 EDN Design Idea The NiCd and NiMH battery charger in Figure 1 applies a battery
fast-charge controller IC in a way that not only provides peak-voltage fast-charge termination--asIC was designed
to do--but also precisely regulatescharge curre. . . [by Thomas A Somerville, Motorola SPS, Tempe, AZ]
Battery Charger with LM317 - LM317 regulator is used to regulate the voltage and current for this circuit. This battery
charger should be used only for Ni-Cad cells. Other type of batteries (li-ion, NiMh, Lead and Li-ion polymer)
needs special care so it cannot be used. . . . [Jose Pino]
Battery Chargers Indicates Rate of Charge - 05/25/95 EDN Design Idea A single LED indicates wherbattery Chargers
delivering a
trickle charge or a fast charge, Circuit designed to charge2-14 cells. . . . [by Larry Suppan, Maxim Integrated
Products, Sunnyvale, CA]
Battery NiCad Rejuvenator - . . . [Tony van Roon's circuit]
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