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Automatic Light Switch Circuit

Konusu 'Elektronik Devreler' forumundadır ve uydudoktoru tarafından 11 Haziran 2011 başlatılmıştır.

  1. uydudoktoru

    uydudoktoru Tanınmış Üye Yönetici Yönetici

    13 Haziran 2009
    Ödül Puanları:
    This light sensitive automatic light switch circuit is intended to be connected at the main 220V supply. The circuit will connect a 220V lamp when at the nightfall and disconnects it in the morning light. The switching is made without a relay in order to avoid problems with the electric arc and noise caused by inductance coil and contacts.

    The automatic light switch is powered from the 220V network through R10, C4, D3, D2 and C3. A reference voltage source, D1, feeds with 8.2 V the circuit for measuring light, R2-P1. At lower light intensity, LDR’s resistance, R2, increases and therefore the P1 voltage falls, so will fall the gate-source voltage of FET’s T1. When the switch S1 is closed, R3-C2 time constant makes that the gate voltage of T1 to vary slower then R2 resistance. This is necessary to prevent the circuit reaction at rapid changes of ambient light intensity.

    Automatic light sensitive switch circuit schematic


    T1, T2, R4, R5, R6 and R8 forms a trigger Schmitt. Normally, T1 is open and T2 is blocked. When the gate voltage of the FET goes below a certain level, T2 starts to conduct and so does T2 which will provides the necessary gate current to boost the triac Tri1 in order to connect the load (220V lamp).
    Caution! Because there are many points that are connected at 220V it is essential to apply a good insolation. Do not work on the circuit when is connected to the mains.
    Components list
    R1 = 2.2K
    R2 = LDR
    R3 = 150K
    R4 = 15k
    R5 = 10k
    R6 = 27k
    R7 = 560Ω
    R8 = 1.2k
    R9 = 1.2M
    R10 = 470Ω
    R11 = 100Ω
    C1 = 4.7µF/16V tantalum
    C2 = 47µF/16V
    C3 = 1000µF/16V
    C4 = 470nF/250V~(630V)
    C5 = 100nF/630V
    D1 = 8.2V zener
    D2 = 1N4001
    D3 = 15V/1W zener
    D4 = LED
    T1 = BS250
    T2 = BC557B
    T3 = BC547B
    Tri1 = TIC226M
    F1 = 5A

    Ekli Dosyalar:

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