Power supply of mobile communications from the on-board network of the car. Scheme, description

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Power supply of mobile communications from the on-board network of the car. Encyclopedia of radio electronics and electrical engineering

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

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The circuit shown in the figure is a voltage regulator used to power mobile communication systems.

(click to enlarge)

Often there are cases when the regular battery is discharged, and you need to urgently establish a connection. In such cases, such simple devices can provide an invaluable service.

Structurally, the device is made in the case of an old, outdated battery. It is required to carefully open the battery, remove the used batteries and connect the output of the stabilizer to the power contacts of the mobile phone.

Connect the stabilizer input through a 2A fuse to the car's cigarette lighter. With the parameters indicated in the diagram, the device is designed to replace batteries with a voltage of 7.2 Volts (the battery is assembled from six cells). The current consumption is up to 1 A. The output voltage should be within 8-9 Volts.

The input filter coil is wound with a wire with a diameter of 0,85 mm, inductance 14 μH. The output transistor Q3 is mounted on a radiator with an area of 250 - 300 mm2 (most often an aluminum plate plays the role of a radiator). Transistors can be replaced with similar ones; the circuit is not critical to their parameters. A properly assembled device does not need adjustment

If necessary, it is possible to change the output voltage parameters to replace batteries assembled from eight or five cells.

See other articles Section Automobile. Electronic devices.

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