Recharging the battery 7D-0,125D from the mains charger. Scheme, description

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Recharging the battery 7D-0,125D from the network charger

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

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The author proposes to refine the industrial charger, supplementing it with indicators and protecting the battery from overcharging.

Nickel-cadmium storage battery 7D-0,125D has become one of the reliable power sources for industrial and amateur designs, including transistor radios.

Usually, for recharging, the battery is removed from the battery compartment and connected to a charger (charger). In addition to long breaks in work, this is due to the inevitable kinks of the connecting wires and their frequent breaks at the connector block.

By adding a device powered by a battery, for example, a Selga receiver, with an additional connector for connecting to a network charger and a Radio Reception - Charging switch, 7D-0,125D can be charged without removing it from the receiver case.

Network chargers for charging 9-volt batteries are described in the pages of the magazine. However, the best of them, for example [1, 2], for a number of reasons (limited access to radio components) can not be repeated by every radio amateur.

At the same time, a memory device manufactured by one of the enterprises of St. Petersburg found mass application. Unfortunately, it lacks any indication and, most importantly, there is no overcharge protection, which is a serious drawback. This is especially important for the use of chargers in rural areas, where the continuity of charging is interrupted by frequent power outages. Therefore, the mentioned device was modified (see diagram) using resistors R1, R2 and a VD1 diode from an industrial charger.

As a basis, I took the device proposed by I. Nechaev and described in the review by V. Maslaev [3] for charging small-sized galvanic cells. Additional parts are placed in the network memory case on two boards made of foil fiberglass with a thickness of 1 ... 1,5 mm. The "regular" memory connector is not used to connect the battery, but an additional one is connected with conductors of the required length.

Recharging the battery 7D-0,125D from the network charger

Now, when the modified charger is connected to the receiver, the green glow of the HL2 LED (switch SA1 is in the "Charging" position) indicates that the charging circuit is working, and when the charger is connected to the network, an additional red glow of the HL1 LED indicates that the battery is being charged. When there is a green glow, but no red, there is no voltage in the network. Such a "torn" mode of charging a 7D0,125D battery is highly undesirable, but where it is inevitable, protection against overcharging must be provided [4]. A VD3 zener diode connected in parallel to the battery with a stabilization voltage of about 10 V at a current of 10 ... 12 mA completely solves this problem. You need to recharge the battery every 3...4 hours of receiver operation at medium volume. The duration of battery charging is 2...3 times longer.

The device uses MLT resistors. Resistor R4 is selected according to the minimum brightness of the LED HL2. Connector X1 and switch - any, preferably small-sized.

Instead of D810, it is permissible to use zener diodes D809-D811, D814B-D814G, as well as KS133A and KS162A or two KS147A connected in series, selecting them for the specified voltage.

Diode VD2 is optional, its role is performed by the zener diode VD3, conducting, if necessary, current in the forward direction.

Literature

Nechaev I. Automatic charger. - Radio, 1985, No. 12, p. 45, 46.
Alexandrov I. Automatic charger. - Radio, 1990, No. 5, p. 39, 40.
Maslaev V. charging device. - Radio, 1989, No. 8, p. 62.
Alexandrov I. Attachment to the charger. - Radio, 1989, No. 5, p. 78.

Author: N.Vashchenko, Rybalche village, Kherson region, Ukraine

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