ifec 2013 - ee.sharif.eduee.sharif.edu/~ifec2013/notes/ifec 2013 summary of... · •a...

IFEC 2013

Summary of Reviewed Papers

Siavash Kananian & Alireza Zabetian

A Flicker-free Electrolytic Capacitor-less AC-DC LED Driver

• The concept of flicker-free electrolytic capacitor-less ac-dc driver for LED lighting is proposed which consists of:

• An electrolytic capacitor-less PFC converter

• A bidirectional buck/boost converter

Waveforms of Operation

Proposed Circuit

• A Fly-back converter at DCM is utilized as PFC.

• The bidirectional buck/boost converter is

• chosen as the bidirectional converter because of the simplest

circuit.

PFC is achieved

A Method of Reducing the Peak-to-Average Ratio of LED Current for Electrolytic Capacitor-Less

AC–DC Drivers

• A method of injecting the third and fifth harmonics into the input current to reduce the peak-to-average ratio of the output current is also proposed.

• A 25 V, 0.35 A output prototype is built and tested in the laboratory, and the experimental results are presented to verify the effectiveness of the electrolytic capacitor-less LED driver and its control method.

A Method of Reducing the Peak-to-Average Ratio of LED Current for Electrolytic Capacitor-Less

AC–DC Drivers

• There is a conflict that if the input power factor is unity, the peak-to-average ratio of the output current is 2;

• And if the peak-to-average ratio of the output current is to be reduced to 1, the input power factor will be zero.

• Therefore, the trade-offs must be balanced.

• This is achievable by injecting some odd harmonics into the input current to reduce the peak-to-average ratio of the output current, while maintaining the input power factor to be higher than 0.9 as required by the regulation standards.

Experimental Results (7.5W)

• Without injection With injection

Achieved a PF of 0.9.

Design of Boost-Flyback Single-Stage PFC Converter for LED Power Supply without Electrolytic Capacitor

for Energy-Storage

• This paper presents the concept of applying large voltage ripple for energy storage into the Boost-Flyback Single Stage PFC converter for the elimination of the electrical capacitor.

Electrolytic Capacitor-less, Non-isolated PFC Converter for High-voltage LEDs Driving

Electronic Driver without Electrolytic Capacitor for Dimming High Brightness LEDs

• The converter, operating with a peak current control, keeps the current through the LEDs constant independently of the bus voltage.

• This is carried out internally by self-adjusting the switching frequency of the converter.

Elimination of an Electrolytic Capacitor in AC/DC Light-Emitting Diode (LED) Driver With High Input

Power Factor and Constant Output Current

Pin<PO

Pin>PO

Elimination of an Electrolytic Capacitor in AC/DC Light-Emitting Diode (LED) Driver With High Input

Power Factor and Constant Output Current

• A 13.5W prototype was designed with PFC:

An Efficient Driver for Dimmable LED Lighting

Spice Simulation

Io

Ip,s

Vo

Vsecondary

A Novel Passive Off-line Light-Emitting Diode (LED) Driver with Long Lifetime

A Novel Valley-Fill SEPIC-derived Power Supply Without Electrolytic Capacitors for LED Lighting Application

A Universal-Input High-Power-Factor PFC Preregulator without Electrolytic Capacitor for PWM Dimming LED Lighting

Application

A Universal-Input High-Power-Factor PFC Preregulator without Electrolytic Capacitor for PWM Dimming LED

Lighting Application

Cost-Effective Hundred-Year Life for Single-Phase Inverters and Rectifiers in Solar and LED Applications Based on MinimumCapacitance

Requirements and a Ripple Power Port

Cost-Effective Hundred-Year Life for Single-Phase Inverters and Rectifiers in Solar and LED Applications Based on Minimum

Capacitance Requirements and a Ripple Power Port

Current Source Ballast for High Power Lighting Emitting Diodes without Electrolytic Capacitor


Rated Power


40% Power

DC Ripple Current Reduction on a Single-Phase PWM Voltage-Source Rectifier

ifec 2013 - ee.sharif.eduee.sharif.edu/~ifec2013/notes/ifec 2013 summary of... · •a...

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