Ni-Cd battery charging current stabilizer. Scheme, description

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Ni-Cd battery charging current stabilizer

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Encyclopedia of radio electronics and electrical engineering / Chargers, batteries, galvanic cells

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The current stabilizer is assembled on the integrated stabilizer KR142EN1A (see diagram). The charging current is set by resistors R3, R4. A charging current amplifier is assembled on transistor VT1. If this current does not exceed 50 mA, the transistor is not needed. Using an amplifier on a powerful composite transistor, the author managed to achieve a current of 4 A. Of course, the resistances of the current-setting resistors R3-R5 and the input voltage were recalculated for this value. Rechargeable batteries are connected to the device in parallel through decoupling diodes (VD1-VD3).

Ni-Cd battery charging current stabilizer

The device was used, in particular, for charging disk nickel-cadmium batteries D-0,06 - D-0,26D. If necessary, they can be connected in series, but the input voltage in this case should be increased accordingly.

To charge three D-0,06 disk batteries, the total charging current is set within 16 ... 18 mA. They are charged with this current for six hours, and then the same amount - half as much. The measurement of the total charging current is carried out with any avometer set to the appropriate limit for measuring direct current. The charging current of a separate battery should be measured with a device whose voltage drop does not exceed 60 mV at the selected measurement limit. For example, the device 43109 is completely unsuitable for these purposes: the passport voltage drop across it is 1,1 V.

With the values of resistors R3-R5 indicated in the diagram and the input voltage, the device provides a charging current of 3,5 ... 250 mA. If it is made as an attachment to a power supply with an adjustable output voltage, it is possible to provide wider limits for current changes.

The device uses integrated stabilizers K142EN1A-K142EN1G or KR142EN1A-KR142EN1G in compliance with the pinout. Transistor - any of the KT815 series. Diodes - any silicon of the same type, but it is better to use germanium, designed for the appropriate current. The capacitance of the capacitors can be in the range from 5600 pF to 0,1 uF.

Author: V. Sevastyanov, Voronezh

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