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25.02.2014
Texas Instruments’s UC2906 is an older (Unitrode) IC designed to build an excellent sealed lead-acid battery charger with a sophisticated charging profile. In addition to the IC, only a handful of resistors and a PNP power transistor Q1 are needed to build it.
An LED with its current-limiting resistor R can be connected to pin 7, which is an open-collector NPN transistor, to indicate the presence of power. This entry was posted in EE Tips and tagged battery, charger, circuit, IC, LED, Linear Technology, Maxim, resistor, Semtech, Texas Instruments, UC2906 by Circuit Cellar Staff. Circuit Cellar's editorial team comprises professional engineers, technical editors, and digital media specialists. To prevent that sensor Q1 is warmed up by its own current draw, I recommend adding a cooling rib of sorts. For this powersupply to work efficiently, the input voltage has to be minimum 3V higher than the output voltage.
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Temperature compensation helps prevent overcharging, the LM334 temperature sensor should be placed near or on the battery.
The charger’s input voltage must be filtered dc that is at least 3V higher than the maximum required output voltage.
Would it be possible to modify the above circuit to produce a 14.3v charge and 13.5v float to charge a gel cell battery? Recent QuestionsTimer for Varroa Mite Treatment electronically controlling a 220V heating wire To run Microwave when power supply isn't there, what type of battery can I use Problem with playing back voices how can an AVR get a generated sin wave by matlab,using serial interface and realize it using DAC?
Your use of this website constitutes acknowledgement and acceptance of our Terms & Conditions. Similarly, an LED with a series resistor could be connected to pin 9, which is also an open-collector NPN transistor to indicate overcharge (it is not used in Figure 1). This battery switch can be used to charge 2 rechargeable batteries separately using a power source such as a car alternator, solar power system, wind turbine, battery charger and so on.
The charging current decreases as the battery charges and when the current drops to 180 mA the charging circuit reduces the output voltage to 2.35 V per cell, leaving the battery in a fully charged state.
The comparator’s output controls the voltage regulator, and produce the lower float voltage when the battery-charging current, passing through R1, drops bellow 180 mA.


Open the regulator, replace the 56 ohm resistor marked as VR1, with a 100 Ohm trim pot via two tiny wires.
The UC2906 datasheet and the Application Note provide tables and equations for selection of resistors Rs, Rt, RA, RB, RC, and RD and suggestions for adding various features.
The charging current is distributed so that flat batteries are charged more strongly than almost full ones.
Ideal for running TVs, radios and so on from one rechargeable battery in camper vans and keeping a second battery fully charged for ignition. Also useful in holiday homes to prevent the alarm system's rechargeable batteries from running down.
I have more than one car and while not in drive I trickle the battery to keep at 12.9 V without charging element.



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