Power Supplies for LED Driving (Google eBook)
Light-emitting diodes are being widely used due to their efficient use of power. The applications for power LEDs include traffic lights, street lamps, automotive lighting, architectural lights, household light replacements, signage lighting (replacing neon strip lights and fluorescent tubes), and many more.
Powering (driving) these LED's is not always simple. Linear driving is inefficient and generates far too much heat. With a switching supply, the main issues are EMI and efficiency, and of course cost. The problem is to get a design that meets legal requirements and is efficient, while costing the least. This book covers the design trade-offs involved in LED driving applications, from low-power to UB-LEDs and beyond.
* Practical, "hands-on" approach to power supply design for LED drivers
* Detailed examples of what works and why, throughout the design process
* Commentary on how the calculated component value compares with the actual value used, including a description of why the choice was made
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Essentials of Switching Power Supplies
AC mains applications boost converter boost-buck converter buck circuit buck converter calculated capacitance ceramic capacitors components connected continuous conduction mode core current flow current level current limit current mirror current rating current sense resistor ð Þ devices Dmax duty cycle efficiency electrolytic capacitor energy equation filter fly-back forward voltage drop heatsink high frequency high voltage higher hysteretic impedance inductance inductor current inductor L1 input current LED current LED load LED string linear linear regulator low voltage magnetic minimum input voltage MOSFET MOSFET switch off-time ohms operating output capacitor output current output voltage P-N junction peak current power dissipation power factor power LEDs power supply PWM dimming reduce regulator resistor ripple current Schottky diode self-resonant frequency SEPIC shown in Figure signal supply voltage surface mount switching frequency switching losses temperature transistor typical voltage rating winding wire Zener diode