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Опубликовано 2013-04-24 16:54:27 автором Ruslan Voltage converter 12c-19c Laptop After assembling windmill , which charged 12 -volt battery , the question arose , and what it can be powered . One of my main device was a laptop , it could be powered by a windmill in two ways : - Use converter 12V -> 220V , and it has to connect the standard charging , which will make of 220v 19v . This option does not suit me because the overall efficiency of such a system will be small , and precious energy is lost on converters . For example, the efficiency of the converter 12V -> 220V somewhere around 0.8 , and the charging efficiency of laptop around 0.9 , it turns out the total system efficiency of 0.72 , which is not very happy. Use
- converter 12c -> 19c, an efficiency in the area of 0,9
The latter option was more attractive and I started to assemble dc / dc converter 12v -> 19v . On the Internet scheme was found by an unknown author
Here is the main element of the PWM chip UC3843.Ona clocked at 42 kGts.Chastota given RC chain R8 C13. The PWM circuit supplies a signal to the terminal 6 , is amplified by transistors T2, T3 and enters the main switch T1. T2, T3 are used to reduce transients ( opening-closing ) for T1. Voltage feedback performed on R3, R2, R1 and trimmer P1. Inductor L1 is wound on a ring of diameter 30mm atomized iron wire 0.8 mm. Input and output filters may be used and smaller denominations , depending on the load.
We need to build :
Radiodetal | Model | Number |
The main characteristic | Driving | Shop |
resistor | low-powered | 1 |
5.6 ohms | R1 | Buy
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resistor | low-powered | 1 |
51 ohms (51.1 ohms) | R2 | Buy Buy
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resistor | low-powered | 1 |
9.1 ohms (9.09 ohms) | R3 | Buy Buy
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resistor | low-powered | 1 |
1 MOhm | R4 | Buy
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resistor | low-powered | 1 |
4.7 kOhm | R5 | Buy
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resistor | low-powered | 2 |
15 kOhm | R6, R8 | Buy
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resistor | low-powered | 1 |
27 kOhm | R7 | Buy
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resistor | low-powered | 2 |
6.8 ohm | R9, R10 | Buy
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resistor | low-powered | 1 |
10 kOhm | R11 | Buy
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resistor | low-powered | 1 |
100 ohms | R12 | Buy
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resistor | trimmer | 1 |
5KOm | P1 | Buy
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Capacitor | Electrolytic | 4 |
3300μF 16V | C1-C4 | Buy
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Capacitor | | 3 |
1μF MKT | C5, C10, C12 | Buy
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Capacitor | Electrolytic | 4 |
2200μF 25V | C6-C9 | Buy
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Capacitor | Ceramic | 1 |
22nF | C11 | Buy
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Capacitor | Ceramic | 1 |
2.2nF | C13 | Buy
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Capacitor | Ceramic | 2 |
100nF | C14, C15 | Buy
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Capacitor | Electrolytic | 4 |
10μF 63V | C16 | Buy
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Throttle | | 1 |
56μH | L1 |
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Schottky diode | MBR1645 | 1 |
for any I> 10A U> 30v | D1 | Buy
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Transistor | IRL2505 | 1 |
Field | T1 | Buy
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Transistor | BD139 | 1 |
bipolar | T2 | Buy
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Transistor | BD140 | 1 |
bipolar | T3 | Buy
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Chip | UC3843N | 1 |
PWM controller | IC1 | Buy
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PCB
was made by LUT beginners can gather and breadboard .
circuit board
Datasheet on UC3843N
If you are unable to collect this converter , you can order it from us
Комментарии - (2) timofey говорит: А если у меня ноут 18 или 20 вольт потребляет? есть возможность подрегулировать напряжение? Admin говорит: Да есть возможность установить напряжение на выходе. Синий подстройочный резистор.
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