For high-power built-in/external lamp power supplies above 25W, due to high power factor and THD requirements, and the output current is relatively large, the current solution is usually a two-stage rack (APFC+DC/DC). Mainly.
The traditional two-stage solution, because it requires two chips to be controlled separately, is often difficult to optimize in terms of chip power supply, drive efficiency and volume, BOM quantity and cost.
As a solution for Jingfeng Mingyuan in high-power high-end lamp driving power supply, UR3311 is a two-in-one control chip based on two-stage architecture, which can be applied to BOOST+FLYBACK isolation application or BOOST+BUCK. Non-isolated applications. Suitable for lamp power supplies with high power factor, low THD, low output current ripple requirements.
Chip Features UR3311
1, patented smart chip power supply
Patented smart chip power supply and critical current valley detection without auxiliary winding
UR3311 is the simplest and lowest cost solution for transformer and inductor design in the current two-stage solution. The power inductor of the front stage BOOST is a single winding inductor, the rear stage isolation FLYBACK is a double winding transformer, and the rear stage non-isolated BUCK is a single winding inductor.
2, simpler BOOST inductance design
Maintain full voltage to maintain high efficiency.
When the BOOST stage is the low-voltage input, the latched BOOST output voltage is 280V. When the input voltage rises, the BOOST output voltage is follow-type, which realizes a simpler BOOST inductor design and maintains full voltage to maintain high efficiency.
3, the best conversion efficiency
Critical Current Mode (BCM) + Valley Quasi-Resonant Mode
Both stages are critical current mode (BCM) + valley quasi-resonant mode of operation for optimum conversion efficiency. High precision constant current algorithm and perfect protection function.
Characteristic advantage UR3311
Full voltage range PF" 0.95, THD "10%;
Output current ripple is less than ±5%, no stroboscopic;
Up to 88% efficiency (isolation);
"500ms quick start;
Excellent linearity and load regulation, good consistency;
Patented algorithms that greatly reduce the number of peripheral devices;
Support for isolated and non-isolated applications;
Built-in comprehensive protection features;
Typical application UR3311
Full voltage input high PF low frequency flash external power supply application input voltage: 90~270Vac
Output LED: 36V/1A
PF"0.95
THD "15% 1
PCB physical map
Schematic
PF, THD and efficiency graph
UR3311 You can select the BOOST+FLYBACK and BOOST+BUCK topologies as needed. You only need to change the connection of the MODE pin to select different application topologies. In general, external power supplies for panel lights or other applications should use the BOOST+FLYBACK topology. This topology has the advantages of high security level and good consistency. BOOST+BUCK topology can be used for high efficiency, high efficacy built-in or second-class lighting applications. This topology has the advantages of high efficiency and low application cost.
The Led Emergency Inverter is a combination of a white high-quality ABS shell and an external lithium ion battery , which is small in size and easier to hide in the ceiling . This Emergency Conversion Kit is suitable for all external driver of LED lights in the wide voltage AC85-265V range , equipped with lithium ion battery that can be recharged up to 500 times , the emergency power supply has multiple protection functions , such as overcharge , over-discharge , short circuit protection , etc .
Led Inverter,Led Power Converter,Led Emergency Battery Driver,Emergency Light Conversion Kit
Jiangmen City Pengjiang District Qihui Lighting Electrical Appliances Co., Ltd , https://www.qihuilights.com