| Lead Acid Battery Charger (LM317) - The above pictured schematic diagram is just a standard constant current model with a added current limiter, consisting of Q1, R1, and R4. The moment too much current is flowing biases Q1 and drops the output voltage. The output voltage is: 1.2 x (P1+R2+R3) /R3 volt. Current limiting kicks in when the current is about 0.6/R1 amp __ Designed by Tony van Roon VA3AVR Lead Acid Battery Charger with Float - The circuit furnishes an initial charge voltage of 2.5 Volt-per-cell at 25°C to rapidly charge a Lead-Acid battery. The charging current decreases as the battery charges, and when the current drops to about 180mA, the charging circuit reduces the output voltage to 2.35 Volt-per-cell, floating the battery in a fully charged state. This lower voltage prevents the battery from overcharging, which would shorten its life. The LM301A (Tony van Roon's U3) compares the voltage drop across R1 with an 18-mV reference set by R2. The comparator's output controls the voltage regulator, forcing it to produce the lower float voltage when the battery-charging current passing __ Designed by Tony van Roon VA3AVR
Lead-Acid Battery Charger with Voltage Analyser - Nowadays maintenance-free lead-acid batteries are common in vehicles, inverters, and UPS systems. If the battery is left in a poor state of charge, its useful life is shortened. It also reduces __ Electronics Projects for You
Lead-Acid Charger Signals End Of Charge - 09/12/97 EDN-Design Ideas The lead-acid battery charger in Figure 1 works with either gel- or wet-cell, lead-acid, 12V batteries. The charger includes the proper temperature compensation for the charger output voltage as well as a detector that signals when the battery is fully charged Design by Chester Simpson, National Semiconductor, Santa Clara, CA
Lead-Acid Low-Battery Detector with System Shutdown - Resistor dividers are used to provide a signal comparison against a reference voltage. The opamps operate as precision comparators to provide indications of battery charge state__ Linear Technology/Analog Devices App Note, Jun 21, 2010
Low-Cost Battery Charger - Here is a very simple and low-cost charger for 12V, 7Ah lead-acid batteries. It can also be used for powering automobile engines and emergency lighting systems. As shown in the figure, diodes __ Electronics Projects for You
Motorbike Battery Charger - ideal to enhance any scalectrix race track __ Contact: P. Townshend EduTek Ltd
Motorcycle Battery Charger - This 3A charger was originally designed to work with small batteries like those used in motorcycles. In principle it can be used to charge car batteries also but will take a lot longer. The charger below charges a battery with a constant current to 14.1 volt. When this level is reached, the current charge drops automatically to a safer level (13.6V) and keeps charging __ Designed by Jan Hamer, The Netherlands
New Battery Charger ICs Need No Heat Sinks - DN124 Design Notes __ Linear Technology/Analog Devices
Optimizing High-Frequency Battery Charger Performance for Worldwide Applications - 07/06/00 EDN-Design Ideas Providing Power for electric vehicles for worldwide use requires knowledge of energy conserving and high efficiency technologies Design by Anuradha Rao and Jon Marshall, Curtis Instruments Inc
Portable Solar Battery Charger - Here's a neat little project that uses both your ham and carpentry Homebrewing skills. (No jokes about my woodworking, now) About a year ago, I bought a 5 Watt solar panel on sale at Harbor Freight. It's an ICP Battery Saver Pro, and will supply about 15 Volts DC at 335 mA in full sunlight, which is about perfect for the 7 AH batteries I usually use for QRP portable __ Designed by Monty Northrup
Power inverter is bidirectional - 08/02/01 EDN-Design Ideas If you want to swap charge in either direction between unevenly loaded positive and negative battery buses, you need an inverting dc transformer. One implementation is the symmetrical flyback converter shown in Figure 1. The circuit Design by Tom Napier, North Wales, PA
Pulse Charger for reviving tired Lead Acid batteries - The object is to get the cell voltage high enough for the sulphate to dissolve without boiling or melting the battery. This is achieved by applying higher voltage for shorter periods and let the battery rest for a while. __ Contact: IQ Technologies
Shunt battery charger provides 1A continuous current - 11/20/97 EDN-Design Ideas A shunt method is Preferable than series regulation in Solar Powered Systems. Design by Mitchell Lee, Linear Technology Corp, Milpitas, CA
Simple Circuit capacitor charge Controller - Here's a basic cap switch that will connect capacitor to ground only when it's charged to within 0.4-0.7V from battery voltage (otherwise, it's charging through a 22 Ohm resistor, which can be a low-power 12V lightbulb, too) __ Contact: klausmobile @ yahoo.Com
Simple Circuit car battery charger - Automotive, car and motorcycle electronic circuit diagrams / circuit schematics|
Simple Circuit Car Battery Charger psimages - This very simple circuit uses a transformer , two diodes , a capacitor and an ammeter. To charge a battery just connect+ and terminals of circuit to corresponding terminals of battery. When battery is not charged, ammeter reading shows 1-3 amps|
Simple Circuit Charges Lead Acid Batteries - 02/03/97 EDN-Design Ideas The circuit in Figure 1 charges lead-acid batteries in the conventional way. A current-limited power supply maintains a constant voltage across the battery (2.4V/cell or so, as specified by the battery manufacturer until Design by Dana Davis, Maxim Integrated Products, Sunnyvale, CA
Single Cell Sealed Lead Acid Charger - This charger is only meant for single cells of the lead/acid variety. It can be used for cells with a capacity of up to around 10Ah if R1 is changed accordingly. SLAs should be charged with a current of from 10% to 30% of their rated capacity (in Ah or mAh) __ Designed by Soren
Single Cell Sealed Lead Acid Charger - This charger is only meant for single cells of the lead/acid variety. It can be used for cells with a capacity of up to around 10Ah if R1 is changed accordingly. SLAs should be charged with a current of from 10% to 30% of their rated capacity. __ Designed by Tony van Roon VA3AVR
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 with the addition of a suitable low-dropout voltage regulator. The circuit "scavenges" energy from the solar cell by keeping it loaded near 1.5 volts (maximum energy transfer value) and trickle charges the internal battery pack with current pulses. The simple circuit isn't the most efficient possible but it manages a respectable 70% at 100 mA from the cell and 30% when the cell is providing only 25 mA which is actually pretty good without going to a lot more trouble or using more exotic components. __ Contact: Charles Wenzel of Wenzel Associates, Inc.
Solar Charger for Lead Acid Batteries - Solar lead acid charger, with battery voltage monitor, for12V battery __ Designed by Jan Hammer
Solar charger for lead-acid batteries. - This circuit is still under development, but works well as shown. This circuit is intended for charging lead-acid batteries with a solar panel. The customary diode that prevents the battery from discharging through the solar panel has been replaced by a FET-comparator combination. The charger will stop charging once a pre-set voltage (temperature compensated) has been reached, and recommence charging when the voltage has dropped off sufficiently. The load is disconnected when the baterry voltage drops below 11V and reconnected when it gets back to 12.5V. __ Contact: IQ Technologies
Solar Panel Charge Controller/Low Voltage Disconnect - The SPC3 is a solar power center, it can handle all of the power functions for a solar charged 12 Volt DC system. The SPC3 contains a 9 amp photovoltaic charge controller, a 10 amp low voltage load disconnect circuit and a pair of built-in white LEDs for area illumination. The low voltage disconnect circuit has a load on-off switch and a battery low voltage indicator. By using the SPC3 as the center of a solar powered device, long battery life is assured. The SPC3 can be used for a stand-alone solar lighting system, it can also be used for making solar powered audio and radio devices. __ Designed by G. Forrest Cook
White LED-Based Emergency Lamp & Turning Indicator - White LEDs are replacing the conventional incandescent and fluorescent bulbs due to their high power efficiency and low operating voltage. These can be utilised optimally for emergency lamp and vehicle turning __ Electronics Projects for You
|
