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Battery automatic power-off has simpler Design - 31-Mar-05 EDN Design Ideas: Simplified circuit provide as timed battery cut-off to save power Design by Yongping Xia, Navcom Technology, Torrance, CA
Battery Characterizer - Schematic Only loads charged nicad and nimh battery packs and measures milliamp hour capacity. (18f252) __ Designed by Jon Fick
Battery Desulphation Progress Monitor - A number of readers have asked how to tell when the Lead-Acid Battery Zapper has done its job and battery desulphation is complete. In the author’s experience, batteries that are going to respond to this treatment will generally show quite a high peak voltage across the terminals at the beginning of the treatment. If this__
Battery Discharge Monitor - Here is a battery monitor circuit which disconnects the load when the battery is discharged, preventing a deep discharge which could cause permanent battery damage. The battery is automatically reconnected when a battery charger or other DC source is connected across the load. Select a relay which requires less than 100ma coil current and with contacts capable of handling the load and charging __ Contact: Charles Wenzel of Wenzel Associates, Inc.
Battery discharger - This is a page with a few circuits which may be useful for monitoring the state of your batteries. __ Designed by Richard Torrens
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 __ Designed by Bill Bowden
Battery Low Voltage Beeper - This circuit provides an audible and visual low voltage warning for 12V battery powered devices. Idle current: 6ma Low Voltage Warning current: 15ma. __ Designed by G. Forrest Cook
Battery Monitor also enables constant power boost converter - 11/08/07 EDN Design Ideas: When powering a microcontroller directly from a battery, it is important to monitor the battery voltage to ensure system integrity Design by Rex Niven, Forty Trout Electronics, Eltham, Victoria, Australia
Battery Monitor Draws 8 µA or Les - 04/13/95 EDN Design Ideas: The battery monitor in Fig 1 nominally draws 5 µA during normal operation and flashes an alarm indicator when the battery voltage drops below a critical value. The alarm-state current depends on the desired indicator brightness, but you can easily make the current average less than 500 µA. This monitor was developed as a change-battery warning Design by Arthur W Du Rea Jr, Science Applications International Corp, Oak Ridge, TN
Battery Monitor Emulates Auto Dashboard - 07/03/97 EDN Design Ideas: When you use battery-powered scientific-recording equipment, you must know the state of the battery, because an unnoticed battery run-down can lead to loss of data. Several types of warning indicators are available, but all have their drawbacks. Moving-coil indicators, test terminals, and digital flags, for example, Design by TG Barnett and J Millar, University of London, UK
Battery Monitor for 12V Lead-Acid - This simple circuit makes it posible to monitor the charging process to a higher level. If you need more information then check out the LM3914 Datasheet.
Final adjustsments are simple and the only thing needed is a digital voltmeter for the necessary accuracy __ Designed by Jan Hamer
Battery Powered Lap Top Computer Power Supply - DN18 Design Notes__ Linear Technology/Analog Devices
Battery Simulator Has Variable ESR Response - 03/18/10 EDN Design Ideas: This active circuit represents many battery types. Design by Barry Galvin, Grae LLC, Simi Valley, CA
Battery simulator provides current limiting - 08/01/97 EDN Design Ideas: A constant-voltage active load can perform as a battery during the charge cycle. You can set the load voltage from 5 to 35V by using potentiometer PV and thus can simulate batteries ranging from 6 to 32V. Design by Hernán Tacca, University of Buenos Aires, Argentina
Battery Tester for 1.5 & 9V - Schematic & Notes only, no description included. __ Designed by Martthew B
Battery Tester For Deaf And Blind Persons - Many blind and deaf-blind persons use portable electronic devices to assist their everyday lives but it is difficult for them to test the batteries used in this equipment. Talking voltmeters are available but there is no equivalent usable by deaf-blind persons. This battery tester uses vibration and a user-settable control to enable blind and deaf-blind__
Battery Voltage Monitor - R1 controls the trip-point of the circuit. adjust it accordingly. to reverse the logic (have the LED light up when the battery has at least X amount of power,) connect the LED to ground through R4. __ Designed by Andy Wilson
Battery-Discharge Measurement Circuit - Battery-life measurement for a portable system is a time-consuming task and many methods used for it do not give reliable results. Presented here is a circuit using which you can measure__ Electronics Projects for You
Battery-Level Indicator - Normally, in mobile phones, the battery level is shown in dot or bar form. This lets you easily recognise the battery level. Here we present a circuit that lets you know__ Electronics Projects for You
Battery-Low Indicator - Rechargeable batteries should not be discharged below a certain voltage level. This lower voltage limit depends upon the type of the battery. This simple circuit can be used for 12V batteries__ Electronics Projects for You
Battery-Monitor - A Very Simple circuit and some Variations. Play with it. All parts are cheap and should be easily obtained. __ Designed by G.L. Chemelec
Battery-Status Indicator Uses Two LEDs - 08/12/10 EDN Design Ideas: Use LED brightness to indicate battery charge. __ Circuit Design by Abhijeet Deshpande, People’s Education Society Institute of Technology, Bangalore, India
Button Battery Cell Internal Resistance Measurement Circuit - The open cell voltage of a small silver oxide button cell battery remains very close to 1.5 volts over most of the life of the cell. However, there is a relationship between battery health and the internal resistance of the cell. This circuit when used . . . Circuit by David A. Johnson P.E.-July 11, 2006
Car Battery Failure Detector - A car battery deteriorates in use and its life seldom exceeds four years. When new, its voltage may drop to only 2V while cranking the engine. As the battery ages, its internal impedance increases and so the voltage drop while cranking also increases, until ultimately the drop is high enough to prevent the engine from__
Car Battery Monitor - Don't get caught with a flat battery.__ SiliconChip
Charge Monitor for 12 Volt Rechargeable Lead Acid Battery - A battery is a vital element of any battery-backed system. In many cases battery is more expensive than system it is backing up. Hence we need to adopt all practical measures to conserve battery life. As per manufacturer's data sheets, a 12V rechargeable lead-acid battery should be operated within 10. IV and 13.8V. When battery charges higher than 13.8V __
Circuit disconnects load - 02/17/00 EDN Design Ideas: Placing a load-disconnect circuit on the output of a bootstrapped step-up regulator allows the regulator to start with load currents much higher than would otherwise be possible (Figure 1). During shutdown, the disconnect completely isolates the battery Design by Larry Suppan
Circuit Disconnects Load From Battery - 03/14/96 EDN Design Ideas: To prevent battery damage, the circuit in Figure 1 disconnects the load at a predetermined level of load voltage. This load voltage, VTRiP, is closely proportional to the battery voltage. R1 and R2 determine the level of VTRiP that corresponds to voltage of 1. 15V at pin 3 of IC 1. A voltage of 1. 15V at pin 3 of IC 1 causes the internal comparator to trip. Thus, VTRiP=1. 15 (R1+R2) /R1 Design by Michael Keagy, Maxim Integrated Products, Sunnyvale, CA
Circuit Extends Battery Life - 07/29/10 EDN Design Ideas: Using a relay, the circuit completely disconnects the batter during to eliminate power consumption - two previous Design ideas - describe simple ways to automatically disconnect a battery from its load after a preset on period, which extends battery life (r Design by José M Espí, Rafael García-Gil, and Jaime Castelló, University of Valencia, Valencia, Spain
Circuit Monitors battery voltage - 11/21/96 EDN Design Ideas: The circuit in Figure 1 monitors four NIC d rechargeable batteries and causes the LED to flash if the voltage of the batteries goes lower than 4V. The circuit consumes only 8 mA of current under normal operating conditions. IC 1 is an eight-pin IC that includes an op amp, a comparator, and a 1.2V zener diode. The zener diode connects to the negative input of the comparator in the IC as a reference. R6 and R7 divide the battery voltage Design by Yongping Xia, Philips Lighting Electronics Co, Torrance, CA
Circuit Prevents Deep Discharge Of Batteries - 09/26/96 EDN Design Ideas: 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 Design by Ron Clark and Larry Suppan, Maxim Integrated Products
Circuit protects battery from overdischarge - 04/12/01 EDN Design Ideas: All electronic circuits powered by a battery discharge the battery. In some applications, it is undesirable to overdischarge the battery, because it could irreversibly reduce the battery’s capacity and the number of discharge/charge cycles. The circuit in Figure 1 protectsPDF contains multiple circuits, scroll to find this circuit Design by Martin Wuzik, Implex AG Hearing Technology, Ismaning, Germany
Circuit Safely Deep Discharges NiCd Battery - NIC d batteries possess an undesirable memory effect caused by partial discharges. The remedy is to do a complete discharge before charging again. Figure 1 shows a simple circuit which performs this feat. Although relatively straightforward in concept, the circuit has three redeeming features: 1) it is powered by the battery being discharged. 2) After the battery is fully discharged current drain is only about 4 uA, usually well below the self-discharge of a battery alone. 3) Near end-of-charge the LED flashes.9publised 04/29/99 EDN-Design idea) __ Designed by Jim Hagerman, Science & Technology International, Honolulu, HI
Circuit safely Deep-discharges NiCd battery - 04/29/99 EDN-Design ideas – NOTE: Scroll to find this circuit. Nickel-cadmium (NIC d) 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. Design by Jim Hagerman, Science & Technology International, Honolulu, HI
Configure a Low-Cost, 9V Battery-Voltage Monitor - 27-Nov-08 EDN Design Ideas: You can configure an inexpensive, 9V battery-voltage monitor Design by Paul C Florian, McKinney, TX
Constant Voltage Load Tests Battery Chargers - 04/11/96 EDN Design Ideas: Testing battery-charging circuits on an actual battery can be difficult, because battery voltage changes during the charging cycle. The constant-voltage "load box" circuit in Figure 1 provide as a constant-voltage load for a battery-charger circuit independent of the amount of input current. A constant-voltage load means that the circuit must have a low impedance at all frequencies. The input impedance of this circuit is approximately 0 ohms at dc and 0. 5 ohms at all reasonable input frequencies for charger applications. Design by Jon Dutra, Linear Technology Corp, Milpitas, CA
Digital Lock-In Milliohmmeter - A milliohmmeter is just the tool for checking trace resistance on a printed circuit board, tracking down shorted traces, and measuring the contact resistance of a switch or connector. Its the kind of tool that would come in real handy occasionally, but not often enough to justify shelling out hundreds of dollars. Wanting one anyway, I set out to make my own. It turned out to be not only an exciting project, but a true adventure of discovery as it provided a window into the workings of lock-in amplifiers __ Designed by Dick Cappels
Digital RF Field Strength Indicator - Useful as a transmitter tune-up meter or an RF sniffer, this is an RF field strength indicator that is loosely based on the Broad Band RF Field Strength Probe, described elsewhere. It detects RF via a square law detector, basically its a crystal set with gain. The bias circuit for the detector is significantly modified from the probe to reduce the effects of battery voltage droop during use. __ Designed by Dick Cappels
Discharger for Receiver Battery Packs - You may have read about cycling NIC ad batteries. If not, read a little here (Red's R/C Battery Clinic) for an excellent overview. Overcharging apparently leads to voltage depression, which can be corrected by one or two complete discharges (to 1 to 1. 1 volts per cell). On the other hand, over discharging the batteries to a low or zero voltage can damage them, and if the batteries have not been overcharged and have no voltage depression, cycling just uses up regular battery life. I designed and use this discharger occasionally to remove voltage depression and insure battery capacity is still ok for those planes that have no low voltage alarm. __ Designed by Rob Crockett 8/3/98
Disconnect Load from Battery - 03/14/96 EDN Design Ideas: To prevent battery damage, the circuit in Figure 1 disconnects the load at a predetermined level of load voltage. This load voltage, VTRiP, is closely proportional to the battery voltage. R1 and R2 determine the level of VTRiP that corresponds to voltage of 1. 15V at pin 3 of IC 1. A voltage of 1. 15V at pin 3 of IC 1 causes the internal comparator to trip. Thus, VTRiP=1. 15 (R1+R2) /R1 Design by Michael Keagy, Maxim Integrated Products, Sunnyvale, CA
Dual Battery Power Manager Increases Run Time by 12% & Cuts Charge Time in Half - DN277 Design Notes __ Linear Technology/Analog Devices
Dual PSU - This mini-project came about from building a garden shed - I decided to use an old UPS battery and some spare halogen downlighters for illumination. But as I researched lead-acid technology, I decided that I needed more sophisticated than a simple switch if I wanted the batteries to survive. __ Designed by Mark Hennessy |
