High Power Factor (HPF) Isolated LED Driver Design for 150W-250W Smart Streetlights
Municipal street lighting in India faces severe electrical grid instability, including open neutral faults (up to 440VAC) and heavy monsoon lightning surges. This application note outlines a 150W two-stage (PFC + LLC/Flyback) LED driver topology with 10kV surge immunity and 0-10V/DALI intelligent dimming.
Key Engineering Challenges
Withstanding 440VAC continuous high-voltage line phase-to-phase faults without driver explosion.
High ambient operating temperatures (>50°C inside sealed IP66 die-cast aluminum luminaires).
Maintaining Total Harmonic Distortion (THD) below 10% and Power Factor above 0.98 across dimming levels.
Architecture & Design Advantages
Two-stage topology decouples power factor correction from output ripple, achieving flicker-free (<1%) lighting output.
Yangjie Glass Passivated Rectifiers (GBPC/KBPC) deliver high forward surge withstand capability (IFSM up to 300A).
Luminus high-efficacy COB LEDs (>160 lm/W) minimize luminaire heatsink weight and total mechanical casing cost.
Turnkey Bill of Materials (BOM)
Genuine factory components distributed by KORE
| Component Part | Brand | Function in Circuit | Package | Action |
|---|---|---|---|---|
| Inventronics EUM Series (150W / 240W) | Inventronics | Intelligent Programmable Outdoor LED Driver | IP67 Metal Enclosure | Quote |
| Luminus CXM Series COB LEDs | Luminus | High-Efficacy Commercial Lighting Emitter (165 lm/W) | High-Density COB | Quote |
| Yangjie M7 / US1M Ultra-Fast Rectifier Diodes | Yangjie | High-Voltage Snubber & Output Freewheeling | SMA (DO-214AC) | Quote |
| Reach R8310 / R8312 Linear Driver IC | Reach | DOB (Driver-on-Board) Auxiliary Regulator | SOP-8 | Quote |
Circuit Highlights & PCB Guidelines
- 440VAC High-Cutoff Relay Circuit: Automatically disconnects input when line voltage exceeds 320VAC, restoring when normalized.
- 10kV/10kA Lightning Surge Arrestor: Metal Oxide Varistor (MOV) + Gas Discharge Tube (GDT) network meeting IEC 61000-4-5 standards.
- Constant Current Thermal Foldback: Gradually reduces output current if internal temperature exceeds 85°C, preventing thermal shock.
Conclusion & Procurement:
This industrial street lighting solution delivers 50,000+ hour operational lifespan, meeting all EESL municipal tender requirements with direct component stocking at KORE Noida central warehouse.
Design Quick Specs
Other Application Notes
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