| 摘要 |
PURPOSE: A method for driving a triac of an electronic wall switch device for an illuminating lamp is provided to receive a supply of a power for driving an internal circuit of a switch device at switch in and out lines and control on/off of a triac which is a switching element. CONSTITUTION: A Drivins transistor of a triac(TRC) is connected. A base of the Drivins transistor is connected to an output terminal of a control microcomputer(U1) through a resistor(R5). A resistor(R7), a zener diode(ZD2), and a diode(D5) are connected between T2 terminal of the triac(TRC) and the resistor(R5) to one another in series. In order to turn on an illuminating lamp, when T2 terminal voltage of the triac(TRC) is higher than T1 terminal voltage thereof, the T2 terminal voltage of the triac(TRC) becomes higher than a breakdown voltage of the zener diode(ZD2) to turn on the triac(TRC). When the T2 terminal voltage of the triac(TRC) is lower than the T1 terminal voltage thereof, a gate trigger pulse from control microcomputer(U1) is generated to turn on the triac(TRC).
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