Automatic battery charger 7D-0,1. Scheme, description

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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Automatic battery charger 7D-0,1. 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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The 7D-0,1 rechargeable battery is well known to readers - this power source has long been used in many modern small-sized transistor radios. But probably not everyone knows that battery life depends on its proper charging. It is recommended to charge the battery with a current of 12 mA for approximately 15 hours. This current is provided by a commercially available commercially available charger. However, the duration of charging depends on fluctuations in the mains voltage and the degree of discharge of the battery. Without knowing this, you can inadvertently recharge the battery and disable it due to an increase in gas pressure inside.

A sign of battery charging is an increase in voltage at its terminals up to 9,45 V. Of course, it is inconvenient to control the voltage during battery charging. Therefore, the proposed automatic device was developed (Fig. 7.7), which stops charging the battery when the specified voltage is reached at its terminals.

Automatic battery charger 7D-0,1

While the battery is charging and the voltage on it is below the nominal value, the trinistor V3 is closed. As soon as the voltage on the battery rises to the nominal value, the trinistor opens. The signal lamp lights up and the transistor closes at the same time. Battery charging stops. The trigger threshold of the machine depends on the resistance of the resistor R4.

Diodes D226B can be replaced with D7Zh, a zener diode. D813 - on. D814D, transistor KT315B - to another transistor of this series with a current transfer coefficient of at least 50, trinistor KU103V - to KU103A. Adjust the device with the battery connected and a control DC voltmeter. At a voltage of 9,45 V at the battery terminals, by selecting the resistor R4, the signal lamp is ignited.

Author: Semyan A.P.

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