Power supply of radio equipment from batteries. Scheme, description

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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Power supply of radio equipment from batteries. 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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In some cases, it becomes necessary to power radio equipment (radio receivers, car radios, etc.) from batteries whose voltage does not correspond to the required one. First of all, this applies to heavy vehicles and powerful automotive and tractor equipment, the voltage in the on-board network of which is usually 24 V, and most household equipment is designed for 12 V or even less (9 or 5 V).

The generalized scheme of the matching device is shown in Fig.1.

Power supply of radio equipment from batteries

Radio equipment is a variable load, and a voltage stabilizer is required for its normal operation. To facilitate the thermal regime of the stabilizer, a separate damping device is provided, which brings the available voltage (24 V) to the nominal voltage for the stabilizer (14 ... 16 V for a 12-volt one). In case of failure of the stabilizer and the supply of full voltage to the consumer, an overvoltage protection device will not be superfluous.

A simple diagram of a matching device is shown in Fig. 2.

Power supply of radio equipment from batteries

Ballast resistor R1 is used as a quenching element. The stabilizer is implemented according to the classical scheme on the zener diode VD1 and the pass transistor VT1, and the overvoltage protection is carried out by the zener diode VD2. Capacitor C1 serves as a filter. RF interference that occurs in the on-board network during the operation of the generator, C2 eliminates voltage drops during pulsed current consumption by the load. The VD3 LED, together with the current-limiting resistor R3, serves as an indicator of the operation of the device.

The ratings of the circuit elements for various output voltages are given in the table. When using a composite transistor KT829, the maximum output current is 5 A. The resistances R1 and R2 for this case are indicated in the table in the second lines.

As a quenching resistor R1, you can use a piece of a spiral of wire with high resistivity (nichrome). Since it does not solder well, a special flux is needed for tinning. The connection is best made with screw terminals.

The second scheme of the matching device is shown in Fig.3.

Power supply of radio equipment from batteries

Here, a powerful zener diode VD1 can be used as a quenching element, and the KR142EN8B microcircuit (analogue - IC type 7812) with a permissible current of 1,5 A serves as a stabilizer.

Figure 4 shows a diagram of an adjustable regulator for powering a cooling fan.

Power supply of radio equipment from batteries

Switch S1 allows you to supply it with full voltage (24 V) or adjustable in the range of 2 ... 12 V at a maximum current of 3 A.

(click to enlarge)

Author: P.Redko, Novopolotsk, Belarus

See other articles Section Chargers, batteries, galvanic cells.

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