Ac LED energy-saving delay solar light DIY design

Socket on the bed in the bedroom with a time delay open to turn off the lights, press the switch before going to sleep, the light is on, such as arrange sleep will automatically put out, also convenient prey at night. If the white high brightness led as light source, energy saving and chic. The author made a communication LED energy-saving delay open to turn off the lights, the socket with a belt of TV antenna amplifier power supply box, a H energy-saving lamp circuit board, plus six components and 16 Φ 3 mm white high brightness leds welded together, circuit is shown in figure 1.

S a, the working principle of the press buttons, AC220V mains through a small transformer primary winding, B VD1 ~ VD4, isolating diode bridge rectifier diode VD5, the capacitor C1 quick charge, and the current limiting resistor R to one-way thyristor trigger current v input, make VS conduction, the transformer secondary B output 12 v ac, light LED light-emitting diodes. When switch s disconnect, capacitor C1 discharge, SCR Vs continue conducting, after a delay time, voltage drop to cannot maintain Vs conduction, from zero Vs shut off on the ac power supply transformer B is cut off, LED light-emitting diodes, at this time no longer power circuit itself. Leds light up time, mainly determined by the parameters of the capacitor C1 and R. LED light-emitting diodes (leds) all work in ac circuits, because an alternating current has the positive half cycle and negative half cycle, so 16 leds is divided into four groups, each group of four series, four groups of parallel in the circuit, two groups are to meet, two groups of reverse connection. In the positive half cycle, conducting A, B, C, D conduction when negative half cycle. LED ac drives, conduction in turn, be helpful for heat dissipation and increased longevity. Because leds for ms afterglow, invisible light flickering. Turn on the light in order to avoid instantaneous large current shock light-emitting diodes, connected the two electrolytic capacitor C2 and c3 the non-polar capacitors, in the light emitting diode circuit in parallel, the condenser pressure is higher than 12 v. Second, the components and production 1. With TV antenna amplifier power supply socket box left small transformer, all the remaining components removed. H energy-saving lamp circuit board with rectifier part, the rest all dismantled. City of new models, parameters, as shown in figure 1. Then good welding as required. Note - Should be the appropriate place of the circuit board welding a large tin point for switch fixed point, in the power supply cracks with a piece of phosphorus copper as a switch fixed point ( See figure 2) 。

　　 　　2. Inserted the PCB power supply box side, good pick up line. In the power source place the lid with a layer of white tin foil for reflection. 16 holes on the tin foil to just plug into 16 Φ 3 mm leds shall prevail. 3. At the back of the lid to play a is a little bigger than Φ 5 mm hole, plug in a Φ 5 mm leds head to scrap, for the keys. Note that this button must be aligned as a fixed point of phosphorus copper, it is the LED energy-saving delay light switch. The circuit is simple and easy system, if welding is correct, no debugging can normal use. According to the figure 1 and the parameters of the resistance R, capacitance c can delay 4 minute. If change, 100 uf capacitor to 4700 uf, can delay more than an hour.

editor: li jie