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12V Battery charger circuit

Konusu 'Güç Kaynakları - Besleme Devreleri' forumundadır ve guclusat tarafından 30 Haziran 2012 başlatılmıştır.

  1. guclusat
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    guclusat Tanınmış Üye Süper Moderatör

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    This battery charger circuit can be used to charge one or more batteries with the total nominal voltage of 12 V, meaning ten NiCd battery or six 2 V lead acid. The circuit is pretty small and can be built in a housing network adapter. The incorect usage is impossible: connecting the batteries with reverse polarity, shortcircuit of the output terminals or power loss have no impact on the charger or battery.

    We can use a transformer with 18 V on the secondary and then using a diode bridge to rectify the 18V ac voltage we get 22V dc on C1.

    The completely discharged batteries are charged at the begining with a 6 mA current thru R2-D2 and R4-R6-D1. One the bat. have reached 0.3 – 0.5 V, the base-emitter voltage of T1 is high enough to bring the transistor in conduction.
    Green LED D4 is used as an charging indicator and opens T1.
    There is a 60 mA current flowing thru R5-R6, this means that the charging of a 500 mAh NiCd battery will take 12 hours.
    If the battery is connected with reversed polarity or there is a shortcircuit, the power transistor T1 remains blocked and the charging current can not exceed 6 – 12 mA. The current draw at maximum load is around 80 mA.

    Battery charger circuit schematic


    [​IMG]
    Battery charger PCB Layout

    [​IMG][​IMG]

    Components List
    R1 = R2 = 10K
    R3 = 1K
    R4 = 5.6K
    R5 = R6 = 12Ω
    C1 = 1nF
    C2 = 220µF / 35V
    D1 = 1N4001
    D2 = D3 = 1N4148
    D4 = green LED
    T1 = BD140
    T2 = BC546

    Devre açıklamaları ve baskı devreleri ekten indirebilirsiniz..

    https://cloud.mail.ru/public/ca39e2de2256/12V Battery charger circuit.zip
     
    Son düzenleme: 15 Temmuz 2014
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