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Battery Charger Circuits
Battery Charges      Alkaline       Lead Acid       
Lithium     
Nickel

Last Updated on: Thursday, April 07, 2016 02:04 PM

Circuits Designed by Dave Johnson, P.E. :

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

 
 
 

Battery Amp-hour Capacity Tester -  I bought some lithium ion rechargeable batteries a while back. I was planning on using them to modify some solar powered LED spot lights. What I like about these new batteries is that they are the same size as a standard 1. 5v alkaline AA cell . . . [Circuit by Dave Johnson P.E.,  02/05/12]

 

Battery Box -  When an application or circuit is powered by batteries the device comes under a criteria of obligation. If a rechargeable power source is not being used then the batteries have to be replaced quite often in a high drain circuit. . .  [email Colin Mitchell: talking AT tpg.com.au]

 

Battery Charge Current Indicator -  This circuit turns on a LED whenever it detects at least 25ma of battery charge current . . . [Circuit by Dave Johnson P.E.,  07/23/06]

 

Battery Charger -  Current and Voltage Regulated for Sealed Lead Acid types. . .  [G.L. Chemelec]

 

Battery Charger (appnote) -  STMicroelectronics provides battery charger ICs and full solutions for cell phones, note books, digital cameras, hand tools and many other battery-powered applications. Several solutions are proposed to charge lithium-ion, nickel-metal hydride and nickel-cadmium batteries. Switched mode solutions are mainly used in portable or high power applications. The following diagram shows a wide range of products for battery charger design. . .  [Application Note]

 

Battery Charger (sound.westhost) -  Automatic Charger for Battery Operated Hi-Fi Preamps . . . 

 

Battery Charger 110 to 12 volt Non-Isolated type -  POSSIBLE SHOCK HAZZARD, A Good Simple Charger, BUT When Charging, This Circuit and the circuit it is connected to, MUST BE ISOLATED FROM THE USER. . . .  [G.L. Chemelec, designer]

 

Battery Charger 12v SLA -  Before we go into the operation of the SLA Battery Charger circuit, there are a number of points we need to cover about the care and use of Sealed Lead Acid batteries. Firstly, these batteries must be charged, discharged and stored very carefully. We normally think batteries can be stored for months (if not years) and they will be available for immediate use. . .  [Collin Mitchell's web site]

 

Battery Charger Current and Voltage Regulated for Sealed Lead Acid types -  Like the Battery used in my Metal Detector or other simular types. . . .  [G.L. Chemelec, designer]

 

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--as  IC was designed to do--but also precisely regulates  charge curre. . .  [by Thomas A Somerville, Motorola SPS, Tempe, AZ]

 

Battery Charger Trickle-Charges from Line Source -  07/04/96  EDN Design Idea   For trickle-charging low-power products such as shavers, yard and power tools, and flashlights, the Unitrode UCC3890 off-line, battery-charger IC provides 1 to 2W of constant-current or -voltage charge from 100 to 400V dc. The device charges single-cell r. . .  [by Bill Schweber, Unitrode Corp, Merrimack, NH]

 

Battery Charger with Automatic Switch-off -  This smart charger automatically switches off when your rechargeable batteries reach the full charge. . . .  [ EFY Enterprises Pvt. Ltd. All rights reserved.]

 

Battery Deep Discharge Saver -  This circuit can be used to ensure that a 12V sealed lead-acid battery does not go into the condition of deep discharge. . . .  [ EFY Enterprises Pvt. Ltd. All rights reserved.]

 

Battery Equal Charge Indicator -  The circuit below illuminates an LED to indicate unequal charges between two 12 volt lead batteries. It can be used to verify that two batteries are connected in parallel or isolated since the LED will be off when the voltages are equal within a tollerance, or on if the voltage difference is greater than 100 millivolts. Three comparators. . .  [Bill Bowden, designer]

 

BattMan II: A Computer Controlled Battery Manager -  BattMan II is a computer controlled battery manager, intended for typical rechargeable batteries used by R/C and electronics hobbyists, as well as various consumer product batteries. . . .  [Stefan Vorketter]

 

Broken Charger-Connection Alert -  Detects if a device is not properly connected to its supply. Suitable for battery chargers, portable appliance supplies etc. . . .  [Flavio Dellepiane's web site]

 

Buck converter charger also provides system power -  11/16/96 Literature Number: SNVA532Switching Regulator providescharge voltage setpoint with Current regulation, and second Switching Regulator provides 5V System Power -Many systems require long-time operation during periods of power loss. Often, a gel or wet-cell lead-acid battery isbest choice because of high capacity and relatively low cost. The battery charges. . .  Application Note by Robert Hanrahan, National Semiconductor, Woodcliff Lake, NJ]

 

Buck-converter charger also provides system power -  05/22/97 EDN Design Idea    witching Regulator providescharge voltage setpoint with Current regulation, and second Switching Regulator provides5V System Power -Many systems require long-time operation during periods of power loss. Often, a gel or wet-cel. . .  [by Robert Hanrahan, National Semiconductor, Woodcliff Lake, NJ]

 

Build a Simple Rechargeable CMOS Battery -  Occasionally we come across a computer motherboard that seems to eat those CR2032 batteries every 4 to 5 months. This is particularly frustrating because the computer works perfectly once booted but all the important BIOS settings are lost when the CR2032 battery fails. This is very irritating if the affected computer will not boot up with the default BIOS settings. I recently had a computer motherboard with this same irritating phenomenon. A test revealed that the current drain. . .  [Radio Amateur Society of Norwich by N1HFX]

 

Build Your Own Solar Battery Charger -  For this project I used 12 cells but you really only need 6. So if you are on a budget use 6 but if you want a fast charger use 12. Next lay out all your cells on your window to make sure everything is going to fit. I used the "deeper" side of the window so that there would be more room. . . 

 

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 . . . [Hobby Circuit designed by David A. Johnson P.E.,  05/01/12]

 

Car Battery Charger -  If Built and Setup Correctly, It will safely charge at 10 Amps and Automatically Regulate down to a Trickle Charge. This Charger Can't be used as a Power Supply, Without having a battery in place. The Battery MUST be Connected to get power out. . . .  [G.L. Chemelec, designer]

 

Car battery charger with automatic cutoff -  Automotive, car and motorcycle electronic circuit diagrams / circuit schematics. . .  [Designer's name not included]

 

Car Battery Indicator -  Text is not English. . .  [from Smartkit]

 

Car-Battery charger for Nokia 8210 -  It's just a simple power supply with a 7805 regulator, the chip must be mounted on a large metal radiator, because the current requested by the regulator is near 0. 4 A. However to lower the power, you can put a 10 ohm 2 watt( 0. 4*5=2 w) in series to input pin. You can use it in you car , by connecting it to your lighter plug. . . .  [designer identified as Alfred73]

 

Cell Phone Charger -  It seems that as cell phones become more sophisticated, their operating times become shorter and shorter. If you are on the go all the time and have difficulty finding AC or DC outlets to charge your phone, you might consider this simple scheme . . . [Hobby Circuit designed by Dave Johnson P.E.,  08/24/09]

 

Cell Phone Solar Powered Charger -  The simple circuit below regulates the voltage from a 6v solar panel to a fixed +5v. That voltage can be fed to any cell phone or USB connected portable device, to charge its battery. The circuit uses a Reg113-5 voltage regulator from Texas Instruments . . . [Hobby Circuit designed by David Johnson P.E.,  01/02/11]

 

Circuit Indicates Battery Charge Current -  This circuit was inspired by a company needing a DC current indicator light which was small enough to be molded into a medium size 28v rechargeable battery assembly. They specified that they wanted the circuit to turn on the LED indicator light with 500ma or more of battery charge current . . . [Hobby Circuit designed by Dave Johnson P.E.,  01/23/11]

 

Circuit indicates Battery Charging Current -  Anyone who has ever had a shocking experience on an especially dry day is acutely aware of the kinds of high voltage that can be generated from a simple walk across a carpeted floor. Those same finger to metal sparks can destroy or disrupt sensitive elect . . . [Hobby Circuit designed by Dave Johnson P.E.,  01/23/11]

 

Circuit Prevents Deep Discharge of Battery -  09/26/96 EDN Design Idea   NOTEPage includes several designs, scroll to find this onemCs such as the 8051 and 8096 and UARTs such as the 82510 provide hardware support for a multiprocessor asynchronous serial-communication protocol (MicroLan]. This featu. . .  [by Rolando Herrero, Instituto Tecnologico de Buenos Aires, Argentina]

 

Current Indicator for Battery Chargers -  This circuit was inspired by a company needing a DC current indicator light which was small enough to be molded into a medium size 28v rechargeable battery assembly. They specified that they wanted the circuit to turn on the LED indicator light with 500ma or more of battery charge current . . . [Circuit by Dave Johnson P.E.,  01/23/11]

 

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DIY Cell Phone Charger -  It seems that as cell phones become more sophisticated, their operating times become shorter and shorter. If you are on the go all the time and have difficulty finding AC or DC outlets to charge your phone, you might consider this simple scheme . . . [Hobby Circuit designed by David A. Johnson P.E.,  08/24/09]

 

Do It Yourself Portable Cell Phone Charger -  It seems that as cell phones become more sophisticated, their operating times become shorter and shorter. If you are on the go all the time and have difficulty finding AC or DC outlets to charge your phone, you might consider this simple scheme . . . [Circuit by David Johnson P.E.,  08/24/09]

 

Eight-Solar Cell Lithium Ion Battery Charger Version 3 -  A single lithium ion battery cell needs 4. 2v from a current source to insure it is fully charged. A solar panel with just enough individual cells wired in series to produce the needed voltage would be more efficient than one with more cells for a given surface area. If you divide 4. 2 by eight you come up with a figure of 0. 525 volts . . . [Circuit by David A. Johnson P.E.,  05/21/13]

 

Enhanced battery "gas gauge" keeps its data through glitches -  01/20/05  EDN Design Idea   Texas Instruments' BQ2010 battery-"gas-gauge" IC offers a convenient method for recording available charge stored in a nickel-cadmium or nickel-metal-hydride battery. However, even though plenty of charge remains available, under c. . .  [by Herbert Seidenberg, Costa Mesa, CA]

 

Experimental Alternator Controller -  Scroll down to find this circuit. Here is an experimental (and simple!) regulator for alternator chargers. . . .  [Charles Wenzel (unless otherwise noted)]

 

Fake Alarm-Circuit #1 -  Flashing LEDs can be used to create the impression that an alarm has been fitted. Or they can be used in conjunction with a real alarm - to warn-off a potential thief. These three small circuits will flash anything from a single LED - up to 90 LEDs and beyond - with a variety of speeds and patterns. . . .  [Circuit design by Ron J.]

 

Improved Solar Path Light -  The circuit below was designed to replace the guts of an existing path light assembly with one which has a much better performance. I suggest using a quality 10 cell solar panel with at least a 4 square inch area. Buy a panel with solar panels that fills . . . [Hobby Circuit designed by David Johnson P.E.,  03/13/11]

 

Indicate Health of Lithium-Ion Batteries -  05/14/09  EDN Design Idea   A simple inexpensive circuit quickly indicates a battery pack's health. No Description. . .  [by Fritz Weld, Friedberg, Germany]

 

Indicates Battery Charge Current -  This circuit turns on a LED whenever it detects at least 25ma of battery charge current . . . [Hobby Circuit designed by David Johnson P.E.,  07/23/06]

 

Intelligent Lithium/Nimh Battery Charger -  this will top-up your motorbike battery in 2-3 hours and switch off. . .  [by P. Townshend - EduTek Ltd]

 

Intelligent NiCd/NiMH Charger/Cycler with 128x64 Graphical LCD  -  The accu cycler project presented here is an excellent solution for charging and discharging NiCd and NiMH accumulators for R/C modelers and others who make use of these accumulator types. With its performance it is very close to the many of the commercial products available on the market. . . . 

 

iPOD-MP3 Player Charger -  Portable iPod charger that you can use while away from your computer. The circuit is based around an MC34063 switchmode regulator. This has high efficiency so that there is very little heat produced inside the box, even when delivering its maximum output current. The circuit is more complicated than if we used a 7805 3-terminal regulator but since the input voltage could be 15V DC or more, the voltage dissipation in such a regulator could be 5W or more at 500mA. and 5W is far too much for a 7805, even with quite a large heatsink. . . . 

 

L200 charger circuit -  NOTE: Must register on this site. . .  [Published in Elecktor July/Augu, 2010]

 

Li-ion Battery Charger -  This is a charger for lithium ion batteries which takes its power from the USB port of a computer. It uses the MCP73861 or MCP73863 Li-ion battery charger chip manufactured by Microchip. Microchip MCP73861 or MCP73863 are advanced, fully-integrated, single-cell Li-Ion/Li-Polymer charge-management devices allow these peripherals to utilize the full power of the USB port. . . . 

 

Li-Po Charger & Balancer -  This is a Li-Po charger and balancer project for R/C hobby. The charger circuit is based on the circuit of Electron head and all folks in the DIY electronics topic on the rcgroups. com. . . . 

 

Lithium Battery Tester -  I bought some lithium ion rechargeable batteries a while back. I was planning on using them to modify some solar powered LED spot lights. What I like about these new batteries is that they are the same size as a standard 1. 5v alkaline AA cell . . . [Hobby Circuit designed by Dave Johnson P.E.,  02/05/12]

 

Lithium Ion Solar Battery Charger-#2 -  A single lithium ion battery cell needs 4. 2v from a current source to insure it is fully charged.   A solar panel with just enough individual cells wired in series to produce the needed voltage would be more efficient than one with more cells for a given surface area.   If you divide 4. 2 by eight you come up with a figure of 0. 525 volts . . . [Hobby Circuit designed by Dave Johnson P.E.,  05/22/13]

 

Low-battery voltage cutoff consumes just 1 mA -  09/11/99 EDN Design Idea   A low-battery voltage-cutoff circuit prevents overdischarge of a rechargeable battery. An obvious requirement of this circuit is extremely low power consumption. Figure 1a's simple circuit has a measured current consumption of approximately 1. 2 mA and uses only two components to perform the low-battery cutoff function for a four-NiCd battery. . . .  [by Yongping Xia, Teldata Inc, Los Angeles, CA]

 

Motorbike Battery Charger -  ideal to enhance any scalectrix race track. . .  [by P. Townshend - EduTek Ltd]

 

Multi NiCad Charger -  This unit was constructed in the shell of a Radio Shack battery charger. The original unit charged only one type of battery at a time and only in pairs. This unit allows for mix and match for AAA, AA, C, and D cells. Each battery is individually monitored and charged. An LED for each one flashes to show the current charging condition as follows. . .  [Luhan Monat - Mesa Arizona]

 

Multifunction Power Supply -  Many embedded systems these days need +5V power supply with some special functions such as power-fail detection, zero-crossing signals for mains power supply and possibility to maintain the charging of built-in batteries. . . .  [ EFY Enterprises Pvt. Ltd. All rights reserved.]

 

Muscle power drives battery-free electronics -  11/21/05  EDN Design Idea   Your sweat and a super-cap replace the battery. . .  [by Alexander Bell, Infosoft International Inc, Rego Park, NY]

 

Ni-Cad 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]

 

Offline IGBT charges batteries -  12/03/98 EDN Design Idea   (File has several circuit ideas. Scroll to find this one. ) Power supplies for portable equipment must be light, and they must provide international travelers with a convenient universal input. Although switch-mode power supplies naturally benefit from a universal input, they are more expensive than standard linear supplies, which are based on a transformer. Recent insulated-gate bipolar transistors (IGBTs) offer an inexpensive way to charge batteries from the ac line. . . .  [by Christophe Basso, Motorola SPS, Toulouse, France]

 

Photovoltaic Battery Charge Controller -  A charge controller is one of the main components of a solar battery charging system. Its main function is to fully charge a battery without permitting overcharge or reverse current flow (generally during night). . . .  [ EFY Enterprises Pvt. Ltd. All rights reserved.]

 

Picref-5: Smbus Level-3 Battery Charger/Selector Reference Design Based on the PIC16C73a -  Application Note Published 11-May-98. . .  [Microchip]

 

Power Supply 5v Solar -  This project uses the 1. 2v rechargeable battery and solar panel from a Solar Garden Light. These lights can be bought for less than $5. 00 in most $2. 00 shops or similar shops that sell general household items diagram. . . .  [email Colin Mitchell: talking AT tpg.com.au]

 

Powered AA NiMH & NiCd Battery Charger -  The charger in this project is designed to charge two AA NiMH or NiCd cells of any capacity (as long as they are the same) at about 470mA. It will charge 700mAh NiCds in about 1. 5 hours, 1500mAh NiMHs. . . .  [Stefan Vorketter]

 

Pre-Charged (Low Self-Discharge) Rechargeable Battery Roundup -  It's been about two years since I first published my review of Sanyo's Eneloop low self-discharge rechargeable batteries. Since that time, other manufacturers have jumped on the bandwagon. . . .  [Stefan Vorketter]

 

Prevent Deep Discharge of Battery -  09/26/96 EDN Design Idea   NOTEPage includes several designs, scroll to find this onemCs such as the 8051 and 8096 and UARTs such as the 82510 provide hardware support for a multiprocessor asynchronous serial-communication protocol (MicroLan]. This featu. . .  [by Rolando Herrero, Instituto Tecnologico de Buenos Aires, Argentina]

 

Prevents Deep Discharge of Battery -  09/26/96 EDN Design Idea   NOTEPage includes several designs, scroll to find this onemCs such as the 8051 and 8096 and UARTs such as the 82510 provide hardware support for a multiprocessor asynchronous serial-communication protocol (MicroLan]. This featu. . .  [by Rolando Herrero, Instituto Tecnologico de Buenos Aires, Argentina]

 

Provide Automatic Power-Off for Batteries -  05/13/04  EDN Design Idea   The circuit in Figure 1 provides a simple and inexpensive way to protect one of the most valuable components in portable applicationsthe battery. Applications include all portable equipment that requires a limited time of operati. . .  [by Miguel Gimenez, Altair-Equipos Europeos Electronicos, Madrid, Spain]

 

Rechargeable CMOS Battery -  Occasionally we come across a computer motherboard that seems to eat those CR2032 batteries every 4 to 5 months. This is particularly frustrating because the computer works perfectly once booted but all the important BIOS settings are lost when the CR2032 battery fails. This is very irritating if the affected computer will not boot up with the default BIOS settings. I recently had a computer motherboard with this same irritating phenomenon. A test revealed that the current drain. . .  [Radio Amateur Society of Norwich by N1HFX]

 

Rechargeable Flashlight Obsoletes Lantern Battery -  11-Dec-03 EDN Design Idea   This Design Idea   describes a high-intensity, rechargeable flashlight system that you can build from a 6V lantern-type flashlight. The rechargeable battery comprises four 2V, 2. 5-Ahr (ampere-hour] SLA (sealed lead-acid] cells, similar . . .  [by Fran Huffart, Linear Technology App Note, Milpitas, CA]

 

Safely deep-discharge NiCd battery -  04/29/99 EDN Design Idea (contains several designs, scroll to find this one)   Nickel-cadmium (NiCd) batteries can possess an undesirable memory effect due to partial discharges. The remedy is a complete discharge before charging again. Figure 1a shows a simple circuit that performs this feat. . . .  [by Jim Hagerman, Science & Technology International, Honolulu, HI]

 

Salt Water Battery -  . . .  [Bill Bowden, designer]

 

Scheme provides automatic power-off for batteries -  05/13/04  EDN Design Idea   The circuit in Figure 1 provides a simple and inexpensive way to protect one of the most valuable components in portable applicationsthe battery. Applications include all portable equipment that requires a limited time of operati. . .  [by Miguel Gimenez, Altair-Equipos Europeos Electronicos, Madrid, Spain]

 

Simple Circuit Indicates Health of Lithium-Ion Batteries -  05/14/09  EDN Design Idea   A simple inexpensive circuit quickly indicates a battery pack's health. . .  [by Fritz Weld, Friedberg, Germany]

 

Simple circuit safely deep-discharges NiCd battery -  04/29/99 EDN Design Idea (contains several designs, scroll to find this one)   Nickel-cadmium (NiCd) batteries can possess an undesirable memory effect due to partial discharges. The remedy is a complete discharge before charging again. Figure 1a shows a simple circuit that performs this feat. . . .  [by Jim Hagerman, Science & Technology International, Honolulu, HI]

 

Simple warning signal -  Flashing LEDs can be used to create the impression that an alarm has been fitted. Or they can be used in conjunction with a real alarm - to warn-off a potential thief. These three small circuits will flash anything from a single LED - up to 90 LEDs and beyond - with a variety of speeds and patterns. . . .  [Circuit design by Ron J.]

 

Smart Battery Charger -  This unit was constructed in the shell of a Radio Shack battery charger. The original unit charged only one type of battery at a time and only in pairs. This unit allows for mix and match for AAA, AA, C, and D cells. Each battery is individually monitored and charged. An LED for each one flashes to show the current charging condition as follows[list:68e9b49a6d]Dim with bright flash: No battery detected Solid on: Battery charging Blinking on: Battery charged[/list:u:68e9b49a6d] When a battery is first inserted, a small charge is pulsed to it. In between the pulses, the battery is. . .  [Copyright 2006 Luhan Monat]

 

Solar AA cell charger -  This almost trivial circuit may be used to charge a pair of AA or AAA sized rechargeable battery cells from sunlight. The circuit has been used to keep a Palm Pilot and walkman radio running perpetually. This is an unregulated charger, proper charging is achieved by placing the unit in the sun for a known amount of time, this time varies according to the battery type. . .  [G. Forrest Cook]

 

Solar Battery Charger -  . . .  [electronic design by Lennie Zink]

 

Solar Battery Charging -  This instructable will show you how to make your own solar battery charger from very simple components. It is taken from my documentation provided with a kit I supply, you should easily be able to source the same components yourself of course. . . . 

 

Solar Cell Battery Charger/Monitor -  NOTE: Must register on this site. . .  [Published in Elecktor July/Augu, 2010]

 

Solar Cell Charger Circuit -  Another useful application is as a Shunt Regulator for Solar Cells that are used to charge "Lead Acid Batteries". Simply Place it in parallel with the Solar Cell and use Diode De-coupling between it and the battery. . .  [G.L. Chemelec, designer]

 

Solar Cell Phone Charger -  This little gadget uses a small 3 volt solar cell to charge a 6 volt NiCad battery pack which, in turn, may be used to charge many models of cell phones and other portable devices. The circuit "scavenges" energy from the solar cell by keeping it loaded near 1. 5 volts . . . 

 

Solar Lithium Ion Battery Charger Using LT1129 -  I have been designing a number of solar powered devices lately. Many of them use just a single 3. 6v lithium ion battery. These batteries like to be charged from a fixed 4. 2v source with a charging current limited to about C/8, where C is the milliamp-hour rating of the part . . . [Circuit by David Johnson P.E.,  12/30/12]

 

Solar Path Light Improvement -  Use the circuit below was designed to replace the guts of an existing path light assembly with one which has a much better performance. I suggest using a quality 10 cell solar panel with at least a 4 square inch area. Buy a panel with solar panels that . . . [Circuit by David A. Johnson P.E.,  03/13/11]

 

Solar Powered Cell Phone Charger -  The simple circuit below regulates the voltage from a 6v solar panel to a fixed +5v. That voltage can be fed to any cell phone or USB connected portable device, to charge its battery. The circuit uses a Reg113-5 voltage regulator from Texas Instruments . . . [Circuit by Dave Johnson P.E.,  01/02/11]

 

Solar Powered Lithium Ion Battery Charger -  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 a . . . [Hobby Circuit designed by David Johnson P.E.,  05/15/07]

 

Step-Up Supply Charges Battery While Serving Load -  06/08/95 EDN Design Idea   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 . . .  [by Dana Davis, Maxim Integrated Products, Sunnyvale, CA]

 

Supply derives 5 and 3.3V from USB port -  12/20/01  EDN Design Idea   The circuit in Figure 1 derives its power from a USB port and produces 5 and 3. 3V supply rails for portable devices, such as digital cameras, MP3 players, and PDAs. The circuit allows the port to maintain communications while, for . . .  [by Chad Olson, Maxim Integrated Products, Sunnyvale, CA]

 

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. . . .  [G.L. Chemelec]

 

U-131 Simple Switchmode Lead-Acid Battery Charger -  U-131 APPLICATION NOTE. The charger circuit implements a two loop control. system with the current loop operating inside the. voltage loop. During trickle-charge, bulk-charge and (App Note - 6/07) . . .  

 

USB Li-ion Battery Charger -  This is a charger for lithium ion batteries which takes its power from the USB port of a computer. It uses the MCP73861 or MCP73863 Li-ion battery charger chip manufactured by Microchip. Microchip MCP73861 or MCP73863 are advanced, fully-integrated, single-cell Li-Ion/Li-Polymer charge-management devices allow these peripherals to utilize the full power of the USB port. . . . 

 

USB Powered AA NiMH & NiCd Battery Charger -  The charger in this project is designed to charge two AA NiMH or NiCd cells of any capacity (as long as they are the same) at about 470mA. It will charge 700mAh NiCds in about 1. 5 hours, 1500mAh NiMHs. . . .  [Stefan Vorketter]

 

USB-Powered Lithium-Ion Battery Charger -  With a maximum power rating 5. 25V/500 mA, the USB power bus is a great source for charging a single-cell Lithium-Ion battery. The circuit in Figure 1 shows how to build a USB-powered single-cell Li-Ion battery charger using National Semiconductor s LM3622 Li-Ion Battery Charger Controller. . . . 

 

Versatile Battery Charger -  This transformer-based battery charger circuit can be used to charge any battery, provided the transformer rating is higher than the battery rating. . . .  [ EFY Enterprises Pvt. Ltd. All rights reserved.]

 

Voltage Monitor Prevents Deep Discharge of Battery -  09/26/96 EDN Design Idea   To avoid the deep discharge that can destroy or shorten the life of a rechargeable battery, you must disconnect its load before the discharge is complete. This disconnect function requires a battery-voltage monitor, which must incorporate considerable hysteresis to prevent chatter in the disconnect switch. The chatter occurs as the battery voltage first dips below threshold and then bounces back on load removal. . . .  [by Ron Clark and Larry Suppan, Maxim Integrated Products]

 

Wind Generator Dump Load -  The enclosure above contains a wind generator dump load. It was designed to be mounted at a remote repeater site where the source of power is a wind generator. When the battery is fully charged the voltage on the terminals will reach 14. 1V. At this. . . 

 

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. ". . . .  [Tony van Roon's circuit]

 

Zener regulator -  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. . . .  [G.L. Chemelec]

 

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