Power supply of radio equipment from the vehicle's on-board network. Free Technical Library article

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Power supply of radio equipment from the on-board network of the car

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Encyclopedia of radio electronics and electrical engineering / Automobile. Electronic devices

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Many people have portable receivers and tape recorders, and if you also have a car, then on the road it is more convenient to power these devices from the car battery without draining the batteries. It is impossible to connect radio equipment directly to the battery (with the exception of those devices that are intended for this), since its voltage can vary from 10 to 15 V, and portable equipment is powered by a lower voltage.

A feature of the car's on-board network with the engine running is the presence of impulse noise in the form of surges of positive and negative polarity, the amplitude of which can reach 160 V (decreasing after 1 ms). Pulses of positive polarity with an amplitude of up to 90 V also appear in the power circuit and fall off after 0,4 s.

Power supply of radio equipment from the on-board network of the car

Rice. 4.15. Scheme of the power supply of radio equipment from the mains of the car

The power supply unit (Fig. 4.15) eliminates all these overloads and provides a stabilized voltage of 9 V at the output (the load current can be up to 0,8 A). At the input of the power supply there are protective diodes VD1 and VD2, as well as a filter from the inductor L1 and capacitors C1 ... CXNUMX, which significantly attenuates interference.

If you are sure that you will not need to turn on the power of the radio equipment while the car is moving, then the L1 coil can be omitted.

To stabilize the output voltage, a widely used microcircuit KR142EN8A, G or 142EN8A, G is used, which is attached to a heat-dissipating plate.

The device has an internal overcurrent protection that is activated when it exceeds 1A.

For the manufacture of the filter coil, it is necessary to take ferrite armor cups of size B22 (Fig. 4.16) from ferrite grade 2000NM1 (1500NM1) and wind the turns on the internal dielectric frame with a PEL wire with a diameter of 0,25 mm until it is completely filled. Between the cups, you need to make a gap of about 0,1 ... 0,2 mm (inside), which will exclude the magnetization of the magnetic circuit by the constantly flowing current in the coil.

Rice. 4.16. Filter coil design

The circuit uses capacitors C1 of type K73-9, C2 ... C4 of type K50-35. As fuse F1, you can use a jumper made of wire with a diameter of 0,04 ... 0,07 mm.

The power supply can be connected to the on-board network through the cigarette lighter socket or an installed special connector.

The overall dimensions of the device do not exceed 70x60x40 mm (Fig. 4.17).

Ris.4.17

Publication: cxem.net

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