External voltage converter for laptop. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Power supply. Voltage converters, rectifiers, inverters
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The presented voltage converter circuit for a laptop or any other device allows you to get a stable voltage of 16-19 volts at the output, a load current of up to 4 amperes. This allows you to connect a converter instead of a mains adapter.
(click to enlarge)
As an energy source, it is supposed to use Li-Ion or Li-Pol batteries with a capacity of 6-12 ampere hours (8 pieces connected in series). Of course, it is possible to use a different type of battery, with a nominal voltage of 24-29 volts, but this will significantly increase the dimensions of the device.
It should be taken into account that when using the device, it is necessary to take care of the battery protection circuit from deep discharge and the battery status indication circuit. Coil inductance 100-160 mkGn (52 kHz 5A). Transistor Q2 needs to be mounted on a heatsink.
Adjustment of the maximum current is carried out by potentiometer R5, adjustment of the output voltage by potentiometer R13.
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| Random news from the Archive Lead free piezoceramic
09.03.2005
Piezoceramic materials are widely used in modern technology.
A piezoceramic plate has the ability to create an electric charge with any deformation and, conversely, change its shape when an electric voltage is applied to it. The first property is used, for example, in piezoceramic heads for turntables or in gas stove lighters. The second - for example, in cell phone calls.
The most common and most effective piezoceramic material today is lead zirconattitanate, in which lead is 60% by weight. Once in landfills, used electronics pollute the soil and water with lead.
A new type of piezoceramics, which does not contain lead, has been created in the laboratory of the Japanese company Toyota, but in preliminary tests it showed no worse results than lead. It is a polycrystalline material consisting mainly of sodium and potassium niobate with small additions of lithium, tantalum and antimony.
Considering that the Japanese even try to solder their electronics with lead-free solder, the novelty will apparently soon find application in Japanese cell phones.
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