Abstract
This paper proposes a single-stage single-ended primary inductor converter (SEPIC) converter circuit, which is applied to the organic light-emitting diodes (OLED) driver circuit. The circuit proposed in this paper replaces the output Schottky diode from the original SEPIC with a power switch. Deadtime is added to prevent the on-state overlapping of two switches with zero voltage switching (ZVS), and the circuit operates in triangular current mode. The digital control methods are maximum power point tracking and frequency modulation using a battery to supply the converter and illuminate the OLED at night. Finally, a prototype is implemented to show the feasibility under the DC input voltage range of 10–40 V. The DC output is 12 V/1 A/12 W, and the conversion efficiency is up to 96.3%.
Highlights
Light-emitting diode (LED) is currently used in saturation, i.e., in lighting and screen backlighting.Organic light-emitting diodes (OLEDs) were invented at about the same time as LEDs
LEDs are inefficient with high costs but are widely used
When the input is 18 V and the output is 12 V/1 A/12 W, the efficiency is up to 96.3%
Summary
Light-emitting diode (LED) is currently used in saturation, i.e., in lighting and screen backlighting. Organic light-emitting diodes (OLEDs) were invented at about the same time as LEDs. The organic materials used to create OLEDs are expensive to manufacture, and OLED’s efficiency and yield are very low. LEDs are inefficient with high costs but are widely used. Progress in the cost and production of OLED materials has greatly improved efficiency and yield, and engineers are designing OLED power supply drivers to reduce their development.
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