LED lamps' drawings and principles
The LED lights, surely we have been very understanding of it, 50 years ago, is already known to the semiconductor material can produce light of the basic knowledge, the first commercially available diodes in 1960. led the English light emitting diode (LED) acronym, and its basic structure is an electroluminescent semiconductor material, placed in a wire rack, then sealed with epoxy resin around, protect the internal core wire effects and so on. But everyone is familiar with the production of light led it?
Here let Optoelectronics Co., Ltd. Dongguan Ding poly led lamp with you to make the process!
Cans with a spherical tank bottom, rounding with scissors, drilled 20 holes in the above, the distribution of holes were round, try to make something too beautiful, just the size of the hole can be embedded in white light for the degree. White lights to each voltage 3.0V ~ 3.6V, 4 只 a group of white lights in series, operating voltage is 12.0V ~ 14.4V, 5 parallel groups and then white light up in the 12.6V voltage approximately equal to 100mA current power consumption is 1.26W.
220V electricity to work, you need a buck rectifier filter circuit, less expensive way is to use waste for energy-saving lamp control circuit. Energy-saving lamps can be said that everyone has, because of the low value, do not want to repair damaged repair shops generally are treated as waste disposal, so you can not spend money or only a small amount of money received in the waste sites and other places. In fact, most of the damage to energy-saving lamp tube is broken, the circuit is often well used, even if damaged is also easy to repair. 5W ~ 13W energy-saving lamps are used basically the same circuit and components.
Mains through the rectifier and C1, C2 be about 300V DC filtering added to the Q1, Q2 inverter circuit composed, produced tens of kHz high frequency oscillation, the L, C5, T on the discharge tube so that light energy-saving lamps . L and C5 form series resonant circuit, resonant frequency generated in the inverter circuit on the oscillation frequency. Lamp starts, the discharge lamp is not conducting, the resonant circuit, only the lamp filament resistance, the resistance is relatively small, relatively large current loop, the current in L and C5 to generate hundreds of volts, C5, on breakdown voltage of the discharge lamp light. Discharge lamp resistance is very small, it is in parallel with C5 on the Q value of the resonant circuit greatly decreased, C5, and L the voltage down to tens of volts to maintain the continued discharge lamp, which shows the voltage of energy-saving lamps work relatively large changes. Transformation of energy-saving lamp should the power of white light can be directly connected to the C5 L and T of the primary, then L conversion transformer, rectifier and filter circuit to increase the pressure.
In order to more stable low-voltage DC output, L and C5 can not be used as a resonant circuit, the resonant frequency should be much lower than the oscillation frequency inverter circuit, to increase the capacity of C5, from 332 to 473 (ie, 0.047 uF) or greater, even without the C5. L transformation of the transformer is added around the outside of the L low-voltage coil windings. 0.15 ~ 0.17 L generally use the magnet wire, 300 to 320 turns. Measured coil voltage 80 ~ 100V, which can be approximately equal to the number of turns per volt 3.
The way power rectifier full-wave rectifier bridge can be used or double half-wave rectifier circuit. In order to save and reduce the loss of two diodes, the author double half-wave rectifier circuit, double the number of turns required transformer secondary, and center tap. DC voltage supply of white light selection is 12.6V, so the secondary winding of the voltage should be 12.6/12 = 10.5V (DC voltage output filter capacitor is approximately equal to 1.2 times the AC input voltage), number of turns in secondary coil is equal to 10.5 × 3 = 31.5, desirable for the 32-turn, the resultant secondary coil is equal to 64 the number of turns in the center of the first 32 turns out. White lamp current 100mA, copper per square millimeter at 3 amps allow calculation, the choice of 0.25 diameter of the wire, its cross-sectional area equal to 0.049 mm2, allowed by the current is 147mA, more than needed 100mA, to meet the requirements .
Commonly used energy-saving lamps L random coil around the way, winding relatively loose, occupy more space, plus the coil in the original 64-turn coil around the difficult, the solution can be autotransformer way. Circuit installed in the energy-saving lamps for the original head, the body will not come into contact with ramp control circuit, security is no problem. Auto mode is more efficient, than the provinces with the material, but also on the original coil around the next frame.
Remove the L 64-turn coil turns, and then about 0.25 along the primary coil of enameled wire wound 64 turns around the direction, in the center of the first 32 turns out. Padded winding insulation materials do not, do not hand around the winding machine can. If it can not find the 0.25 enameled wire. Another energy-saving lamps can be removed from the coil L, 0.15 enameled wire with coil wound 3 shares and up. Core coil fitted to the attention of the core leaving a gap at the butt. That is, a layer of adhesive paper pad seams, designed to avoid core saturation.