Universal charger for small batteries. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Chargers, batteries, galvanic cells
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It is designed for charging small cells of types STs-21, STs-32, batteries D-0,06, D-0,1, D-0,25, D-0,55, batteries 7D-0,115, as well as galvanic cells 316, 332 and batteries 3336.
The charger (Fig. 7.8) is a current stabilizer made on transistors VT1 and VT2. The stabilizer is powered by a rectifier on diodes VD1 ... VD4 with a smoothing capacitor C1. In turn, an alternating voltage of 12 V is supplied to the rectifier, which can be removed from a ready-made low-power power transformer, for example, TS-5-1. The current required for charging (2,5 ... 15 mA) is set by a variable resistor R5. The set current does not change either during the entire charging period, or when the output terminals XT1, XT2 are short-circuited. The charging process is indicated by the HL1 LED.
Rectifying diodes VD1.VD4 can be, in addition to those indicated on the diagram, any others with a permissible rectified current of at least 30 mA, for example, series KD105, D226 Instead of the AL102B LED, it is permissible to install any of the AL1307A ... AL307G, and instead of the KT315B transistors - KT315A. ..KT315E. Variable resistor R5 - SP5-50 or another, with a power of at least 1 W and with a functional characteristic A, the remaining resistors - MLT-0,125.
As the practice of working with this charger has shown, it is possible to significantly extend the "life" of cells of the STs-21 type by charging them with a current of 2,5 ... 3 mA for 12 ... 13 hours. , approximately equal to a tenth of the value of their capacitance in milliamp-hours.
Author: Semyan A.P.
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