Charging dry cells. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Chargers, batteries, galvanic cells
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Currently, there is a large arsenal of computer technology and household appliances in everyday life that have a separate power supply unit (PSU) that provides a rectified DC voltage of 5–25 V. In some cases, these devices fail, and the PSU remains inactive, while in others These devices are rarely used.
I propose to use a power supply unit for charging dry cells of the type 316, 326, 332, 343. The power supply circuit (see figure) is circled with a dash-dotted line, if it is not available, you can make a power supply unit yourself (there is a lot of literature on this issue).
The circuit for charging dry cells consists of the following elements: a resistor R1, two LEDs HL1, HL2 and a socket XP1. AL307 type LEDs of different colors. In parallel with one of the LEDs (for example, HL1), we mount the leads for connecting the dry cell GB1. Since GB1 is connected in parallel with the LED, the glow of the latter, according to Ohm's law, depends on the degree of discharge of the dry cell (there is no glow at full discharge). As the dry cell GB1 is charging, the glow of the HL1 LED increases. The same glow of the LEDs HL1 and HL2 indicates the end of charging. Resistor R1 is selected according to the allowable operating current of the LED I1 which is equal to 20 mA, and the voltage of the power supply Ubp. R1 = Ubp / I1 = Ubp / 0,02 = 50Ubp.
The resulting value of the resistor is rounded up to the standard. Since the resistor R1 works for a long time, we take its power equal to 1 W. The design features of the charger depend on the type of dry cells used. The socket for installing such an element can be carefully cut out of the plastic case of a failed electronic watch. It can also be used to charge small batteries with minor design changes. The author used this device for charging dry cells of type 326, 343 for 2 years according to the following parameters: Ubp = 25 V; R1 = 1,3 kOhm. Charging time depends on the degree of discharge of dry cells and is in the range of 8 - 28 hours.
Author: V.M.Bosenko, Poltava region
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