Street lamp relates to lighting technology and is applicable to street lamps.The purpose is to design a kind of long life, low power consumption, high power factor, low current harmonic content of energy efficient electronic street lamp.The high-efficiency and energy-saving electric street lamp includes the high-voltage discharge branch R1 and C1 of the power grid, the rectifying bridge d1-d4, the power factor correction branch C2, D5 and D6, the high-intermediate frequency burr filter branch L1 and L3, the high-frequency oscillation circuit bg1-bg2, the starting branch L2, C7 and the lamp tube T.Compared with the previous street lamp can save 80% of electricity;Harmonic content THD < 25%, prolong lamp life can be 3-4 times.
(l) power supply: after the 220v ac power is reduced by C6 current limit, it is rectified and filtered by dz-ds and CS, then stabilized by WDI and WDZ, and outputs two dc voltages, 24V and gV. GV is used for the circuit of optical control and delay part, and 24V is mainly used for the suction of relay J.
(2) light control: at dusk, the illumination gradually decreases, the resistance value of the photosensitive resistor RG gradually increases, the potential at point A decreases with the increase of the photosensitive resistor RG, and the potential at point B also decreases.When the voltage at point B drops to the lower threshold of ICI, namely l/3VD, the 3-pin of ICI changes from low level to high level.At this time, if the voltage at point A fluctuates up and down due to the fluctuation of illumination, but the voltage at point B must charge and discharge Cl through Rl, so the voltage at point B cannot be changed to 2/3 vd, namely the upper threshold of ICI, and the 3-pin of ICI is kept at high level.
