| 摘要 |
PURPOSE: An automatic lighting apparatus is provided to obtain a semi-permanent lighting apparatus with enhanced stability in a circuit thereof by implementing a street lamp to be automatically lighted according to surrounding lightness and a power code and an output line with plug means. CONSTITUTION: An input plug(P) is connected in one end with a stabilizer circuit comprised of a resistance(R1), a Zener diode(ZD1) and a condenser(C1). NAND gates(U1A, U1D) are connected in one end with a photoelectric device(CDS1) which is connected to a variable resistance(VR1). The variable resistance(VR1) is connected to the stabilizer circuit. The NAND gate(U1B) in an output end of the NAND gate(U1C) is connected with a gate of a thyristor(SCR1). A gate of a Triac(TRIAC1) is connected with a bridge circuit(BD) which is connected with the anode end of the thyristor(SCR1). The Triac(TRIAC1) is connected in both ends with a surge absorbing device(TNR1). An ON/OFF switch(SW1) can be operated out of a lighting apparatus. |
