Led panel light is a soft light
9. The choice of MOSFET,
9. The choice of MOSFET,
MOSFET, Q1 is the output of the key components of this circuit. First of all, it's RDS (ON) to be small, so that it work on a small power itself. In addition, its pressure must be high, so high voltage surges encountered in the work can not easily be puncture.
Every switch in the MOSFET process, the sampling resistor R6 ~ R9 current spikes will inevitably occur. To avoid this, set the 400ns chip sampling delay time. Therefore, the traditional RC filter can be omitted. During this delay, the comparator will no longer work, can not control the GATE pin of the output.
10. Current sampling resistor
Resistors R6, R7, R8, R9 in parallel as
Hydraulic Fittings a sampling resistor, this can reduce the accuracy and temperature resistance of the output current, and can easily change one or more of the resistance, to modify the current purpose. Suggested the use of one-thousandth of accuracy, temperature coefficient of 50ppm of SMD (1206) 1/4W resistor. Current sampling resistor R6 ~ R9 to set the total resistance and power use, according to the circuit based on LED light source to calculate the load current.
R (6-9) = 0.275/ILED
PR (6-9) = ILED2 x R (6-9)
11. Electrolytic capacitor
LED panel light source is a long-life light sources, theoretical life of up to 50,000 hours, but unreasonable application of circuit design, improper selection of the circuit components, LED light source heat is not good, will affect its life. Especially in the drive power supply circuit, as AC / DC rectifier bridge output filter electrolytic capacitor, it's life at 5,000 hours less, and this became the manufacture of long-life LED lighting technology stumbling block. The circuit design uses the C1, C2, C4, C5, C7 and more satellites aluminum electrolytic capacitors. Life expectancy of aluminum electrolytic capacitors with temperature has a lot to use the environment to speed up the loss of electrolyte temperature, ambient temperature each increased 6 oC, electrolytic capacitor life will be reduced by half. LED fluorescent tube temperature is not easy because of the air flow, such as power-driven board design is unreasonable, tube temperature will be higher, thus greatly reduced the life of electrolytic capacitors. Use solid electrolytic capacitor, may be a good way to extend the life of one, but led to higher costs.
Applications can be designed to more satellites PT4107 0.06W WLED light series and parallel to the load, input voltage AC 110V or AC 220V to T10, T8, T5 fluorescent lamps in the LED program, and similar applications in the ceiling, sky full of stars lights, outdoor lighting work light, bulb lights, also designed the high brightness 1W WLED light series LED garden lights for the load, LED lamps, LED tunnel lights.
Early 2009, the Japanese government to reduce carbon emissions from public lighting, the implementation of mandatory carbon reduction company policy, Japan is gradually heating up the office needs of energy-efficient lighting, and vigorously promote the LED panel light, to promote the production of Chinese LEDpanel light. Therefore, optimal design with reference to the design of circuits for the LED panel light AC110V circuit has been widely used in the
Centrifugal Fan production.
Led panel light is a soft light
By: zll10417
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