A Non-electrolytic Capacitors Led Driver Power Supply With Power Coupling Circuit

LED is an energy-saving cold light source,with high luminous efficiency,long life,small size,high reliability,fast response and wide range of applications and other characteristics,will replace the traditional mercury-containing incandescent lamp,has become a huge The potential of the strategic emerging industries.However,The real problem is that LED lighting system life is not longevity,the most important reason is not LED is no longer working,but to its power supply drive power electrolytic capacitor damage,directly lead to the entire lighting system does not work.On the basis of reading a lot of literature,Proposed PFC + Buck / Boost without electrolytic capacitors LED driver power supply scheme,PFC circuit using the type Boost conventional structure,the control method using a simple CCM control,Buck-Boost bi-directional converter load in parallel with the LED,replace electrolytic capacitor to achieve power AC input side and the output side of the DC instantaneous power imbalance of power coupling function,design of CCM PFC control strategy and bidirectional converter fixed duty cycle control strategy,the establishment of a saber simulation models and experimental platform,simulation and experimental results show that the power factor of the circuit is above 0.9,the output current and output voltage has a good stability.