مبدل ساده 12 به 15-21ولت برای لبتاپ
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مبدل ساده 12  به 15-21ولت برای لبتاپ مبدل ساده 12  به 15-21ولت برای لبتاپ مبدل ساده 12  به 15-21ولت برای لبتاپ مبدل ساده 12  به 15-21ولت برای لبتاپ مبدل ساده 12  به 15-21ولت برای لبتاپ
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    تاریخ عضویت
    May 2012
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    پیش فرض مبدل ساده 12 به 15-21ولت برای لبتاپ

    Inverter 12V / 15-21V notebook Often it is necessary to power the laptop in places where there is no alternate available network, but only 12V DC source such as batteries, car batteries, onboard vehicle network or solar cells. It would be inefficient and unnecessarily difficult to construct a converter from 12V to 230V/50Hz, which would subsequently pulse source powered laptop, again creating a small DC voltage. Therefore, it is preferable to use direct DC / DC converter, which adjusts the tension in a single step. Power supply various laptop may vary, but usually ranges from 15 to 21V. Output voltage is always higher than the input and was therefore chosen topology Enhancer (in the article on converters is A). The circuit can be used for purposes other than power laptop. Can be adjusted as the inverter 12V / 24V to 24V power from vehicle electrical appliances or 12V battery. Control circuit is known UC3843 , UC3842 is similar to the lower UVLO, which begins to work from 8.5 V Serves as a switching element MOSFET low-voltage conductivity N. It can be any type of voltage UDS 25-60V. Its on-state resistance should not be higher than 6mR and switching times below 100ns instead. Can be used 06N03LA SMD types, or FDB6670AL N306AS, which can be obtained from the PC motherboard. It is also suitable IRF2804S of GME. SMD transistor does not need a cooler. Just cooling pad on the PCB, because the loss is due to low resistance sepnutému small. Can also be used with conventional transistor case, IRF3205 or IRF1405 example. The classical types of resistance is not closed so critical because they can be screwed to a heatsink. Because the operating voltage is sufficiently small, D1 is Schottky type with low loss. Loss on it at full load is about 2W and requires little cooler, which is screwed or soldered. I used SBL1040CT type (10A, 40V) ATX PC. L1 has at least 1 mm and 15T wire is wound on a ring železoprachovém also obtained from its base. The ring is green-red (permeability 55), has an outer diameter of 16mm, inner diameter of 8mm and height of 6mm. You can also use more white or yellow-green-blue koužek eg AT or ATX (both the permeability of 75). Increased permeability to achieve the same inductance with fewer turns. Too few threads may appear excessive heating of the core. The minimum input voltage of the converter is 8.5 V, maximum input voltage is equal to the output voltage. The output voltage is determined by resistor Rx. The Calculate the formula:
    Rx = (U OUT - 2.5). 1880
    for example. for the output voltage of 20V and is based around 33k to 31k based on 19V. Select the output voltage of your notebook. Inverter switching frequency is about 80KHz. Maximum load 4A. Efficiency is greater than 90%. Enhancer disadvantage is that (without adding additional active power components) can not have protection against overload or short circuit. In such a case will be blown PO1. Even after closing the T1 is a current can flow from input through L1 and D1 output. If it bothers you, you can use this converter . Inductance L1 proved about 60 - 240uH. Larger inductance does not make sense because of the unnecessarily large size and SS resistance, inductance again with less risk of excessive ripple current flowing to her stress and unnecessary components. When too small a number of turns (too much tension on the thread) may also železoprachové core overheats.


    Schema converters from 12V to 21V 15-notebook. drive for laptop. board from a PC, which can be obtained from the MOSFET, železoprachové core, and sometimes electrolyte Schottky diode. Green-red železoprachový koužek winding and winding.








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