Battery charger. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Chargers, batteries, galvanic cells
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The circuit is assembled on an adjustable voltage regulator LM317T.
The output voltage Vout is determined by the formula Vout=1,25x(1+R2/R1). The resistance of the resistor R1 is chosen equal to 10 kOhm, and the resistor R2 - 100 kOhm, a small current through these resistors (about 125 μA) causes small losses.
The output voltage of the device is 13,75 V. Resistor R3 and a diode protect the device from damage in case of a short circuit at the output or when the battery is being charged, and also prevent battery discharge if the stabilizer is disconnected from the main power source. Capacitor C1 can be omitted, but it ensures the stability of the microcircuit mode during an extreme charge cycle.
With an appropriate heat sink, the device delivers current up to 1,5 A. It can be permanently connected to the battery without overcharging.
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The German company "ABTIM" has developed in cooperation with the University of Wuppertal a portable device that allows the blind to read.
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