Universal charger for batteries STs-21, STs-32, D-0,06, D-0,1, D-0,25, D-0,55, 7D-0,115, 316, 332, 3336. Scheme, description

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Universal charger for batteries STs-21, STs-32, D-0,06, D-0,1, D-0,25, D-0,55, 7D-0,115, 316, 332, 3336. Encyclopedia of radio electronics and electrical engineering

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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. 1) 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.

Rectifier 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. . Variable resistor R102 - SP307-307 or another, with a power of at least 315 W and with a functional characteristic A, the remaining resistors - MLT-315.

Universal charger for batteries STs-21, STs-32, D-0,06, D-0,1, D-0,25, D-0,55, 7D-0,115, 316, 332, 3336
Fig. 1

Oxide capacitor C1 - with a capacity not less than that indicated in the diagram and for a rated voltage of at least 20 V.

Some parts of the device are placed on a printed circuit board (Fig. 2) made of foil fiberglass with a thickness of 1,5 mm. The mounting is tight, so the resistors and diodes are mounted vertically.

Before you start working with the charger, you need to calibrate the scale of the variable resistor. To do this, the resistor slider is first installed in the upper position according to the diagram and a milliammeter of 25 ... 30 mA is connected to the terminals. The supply voltage is applied to the device and, by selecting the resistor R4, the current through the milliammeter is set to approximately 15 mA. Make a mark of this value on the scale of the resistor. Then the resistor slider is smoothly moved down the circuit, other values of the output current are set and marked on the scale, which means the future charging current.

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. Other cells, batteries and batteries should be charged with current , approximately equal to a tenth of the value of their capacity.

Universal charger for batteries STs-21, STs-32, D-0,06, D-0,1, D-0,25, D-0,55, 7D-0,115, 316, 332, 3336
Fig. 2

Author: V. Nikiforov, Mikhailovka, Volgograd region, Radio No. 1, 1991, p. 69

Refinement

If you are not satisfied with the adjustable limits of the charging current of 3 ... 15 mA, they can be expanded to 1,5 ... 55 mA so that the current is sufficient both for charging foreign cells (1,5 mA) and for domestic batteries D-0,55 .

Instead of the KT315B (VT2) transistor, the author installed a KT815B with a small heat sink, and instead of resistors R4 and R5, he turned on an 11-position switch with a set of resistors for "standard" charging current values: 1,5; 2; 2,5; 3; 6; 10; 11,5; 12; 25; 35; 55 mA. The resistances of the resistors connected by the switch can be selected for specific current values using the method described above. For the specified currents, the author installed, respectively, resistors with a resistance of 910, 680, 560, 470, 220, 150, 120, 110, 51, 36, 22 Ohm. The power of the resistors is from 0,125 to 0,5 watts.

Author: A. Lipukhin, Novokuznetsk; Publication: cxem.net

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