Economical LED lamp for the landing. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Lighting
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The scheme of the proposed LED lamp is shown in the figure. The current is limited due to the reactance ^ of the capacitor C1, which at a frequency of 50 Hz is approximately 14,5 kOhm. Resistor R1 and a protective diode (suppressor) VD1 increase the reliability of the device when turned on, since it is possible that the mains voltage is applied to the device at the moment when the maximum amplitude is reached. Since the initial resistance of the capacitor is zero, all the voltage would be applied to the LEDs, destroying them.
Fig. 1
The voltage drop across the resistor R1 and the LEDs opens the suppressor - a special zener diode that can withstand significant pulse currents. In steady state, it is closed and does not affect the operation of the lamp.
The proposed lamp consumes from the mains voltage Uс current I = Uc/XC1 = 220 / 14,5 * 103 = 0,015 A = 15mA. Resistor R1 dissipates power PR1 = I2R1 = 0,0152*100 = 22,5 mW lightdiodes with forward voltage drop UEL = 3 V consume power PEL = UELI \u3d 0,015 * 0,045 \u45d 7,5 W \u22,5d 45 mW. A current of 67,5 mA flows through each LED. Thus, the active power consumed by the lamp, i.e., taken into account by the electricity meter, is XNUMX mW + XNUMX mW = XNUMX mW.
Structurally, the device is assembled in a plastic case with a base from a faulty CFL (compact fluorescent lamp). From the electronic ballast board located there (electronic ballast), all parts are soldered and two holes are drilled for the LEDs. The details of the device are installed on the side of the printed conductors and soldered to the existing pads. The assembled device is connected with short wires to the central terminal and the base. The board is installed in the case with the parts inside and fixed with a few drops of hot melt adhesive.
Considering the insignificant power consumption, the lamp can be operated without a switch, i.e., constantly connected to the network.
Author: K. Moroz
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Main technical parameters of IP IS 35GM-350, IS 50GM-350:
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Overall dimensions (LxWxH): 215x30x25 mm, 209x39x29 mm
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