Car power supply for a laptop, 12/18 volts. Scheme, description

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Car power supply for a laptop, 12/18 volts. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / Power Supplies

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A portable personal computer (laptop) is a universal thing, it can be used as a video player for watching DVD movies and other formats, as an audio player, and even a TV if you connect the USB-TV set-top box, and now they also advertise mobile Internet in every possible way. Everything would be fine - take it to the country, to nature, and enjoy life without separation from civilization. But the battery capacity is hardly enough for several hours, and where to get a power source if you are "away" from the mains - of course, the battery of your vehicle, whether it be a car or a boat. Here's the problem - only the voltage of the car battery is 12 V, and the laptop eats 18 V.

The figure shows a circuit for raising automobile 12 V to laptop 18 V, moreover, assembled "from what was at home."

Car power supply for laptop, 12/18 volts

The circuit generates pulses on the timer KR1006VI1. They enter the gate of a powerful key on VT1. On the inductance L1, which is rectified by the diode VD1. This voltage charges the capacitor C4. When the voltage on it reaches and slightly exceeds 18 V, the VD3 zener diode opens and opens the VT2 transistor, and it shunts the VT1 gate, closing it.

L1 is wound on the core of the line choke. DF110PC from an old TV. Contains 100 turns wound with PEV 0,43 wire, folded in half (to make it 0,86, but easier to wind).

Everything is assembled with a "hedgehog" in the case and on the board from a faulty switch of the carburetor "Volga" with an induction sensor. The case serves as a heatsink VT1.

Author: Karavkin V.

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Comments on the article:

Vladimir
Two at 0.43 is not 0.86 at all. If the standard diameter is 0,86, then the cross-sectional area will be 0.58mm (2). So if you take two wires, then the diameter of each is 0.6 mm.

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