Sinrace Power Supply Technology (Shenzhen) Co., Ltd.
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| Design of LED drive |
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LED streetlights are drive devices with low voltage, high current, the luminous intensity is up to the current flowing through the LED, the too strong current can cause attenuation of the LED , the too weak current will affect the luminous intensity of LED, thus it needs to provide constant power supply for LED drivers, to ensure the safety of using high-power LED, and to achieve the desired luminous intensity. Using electricity-driven high-power LED should be to solve step-down, isolation, PFC (Power Factor Correction), and constant problems, also have relatively high conversion efficiency, smaller size, can work long hours, easy to heat, low-cost , anti-electromagnetic interference, and over-temperature, over current, short circuit, open circuit protection. This design of PFC switching power supply is with good performance, reliable, affordable and efficient, and achieve satisfactory results during the process of using the LED lights.
A basic principle LED Surge capacity is relatively poor, especially the anti-reverse voltage capability. It’s also important to strengthen this protection. It should be more important to strengthen the surge protection if LED lights are mounted on the outside. Since the start grid load rejection and lightning sensors, the system will invade from a variety of power surge, the surge can cause some damage to the LED. So the LED drive power should have the ability of inhibiting invasion of surge, protecting the LED from damage. EMI filter circuit mainly protect harmonic interference of the power grid from stringing into the module, affecting and controlling the normal operation of circuit. After full-bridge rectified AC , a three-phase become into pulsating DC in the effect of filter capacitors and inductors, output DC voltage. Main switch DC / AC circuit make DC voltage convert to high-frequency pulse transformer secondary output. Transformer output high-frequency pulse go through frequency rectifier, LC filter and EMI filtering, output DC supply which LED lights require. PWM control circuit use voltage and current bicycle-control to achieve the adjustment of output voltage and output current limit. Feedback network use constant current constant voltage devices TSM101and comparator devices, Feedback signals is sent to PFC device L6561 through the optocoupler. Module power factor reach to 0.95 because of the usage of PFC device. |
