Abstract
Light-emitting diode (LED) has the characteristics of environmental protection and energy saving, having become the lighting source of a new generation of street-light lamps. The traditional two-stage power supply for providing an LED street-light lamp is composed of an AC-DC converter with a power-factor-correction (PFC) function at the front stage and a DC-DC converter at the rear stage. The two-stage power supply for an LED street-light lamp has a large number of electronic components and costs, and the circuit efficiency is not high. Therefore, this paper presents a novel single-stage high power factor AC-DC power supply for providing an LED street-light lamp featuring soft-switching and Bluetooth wireless dimming capability through using smart tablets or smartphones to remote control the output power of the LED street-light lamp for achieving energy-saving benefits. The proposed AC-DC LED power supply integrates an interleaved buck converter circuit with coupled inductors and a half-bridge LLC resonant converter circuit into a single-stage power conversion circuit. Moreover, the coupled inductor of the interleaved buck converter circuit is designed to operate in the discontinuous conduction mode, which can naturally achieve PFC. In addition, the two power switches in the novel LED power supply have zero-voltage switching (ZVS) characteristics, which can reduce the switching losses of the power switches. The two output diodes have the characteristics of zero-current switching (ZCS), which can reduce the conduction losses of the power diodes. This paper developed a single-stage prototype circuit for providing an 144 W (36 V/4 A)-rated LED street-light lamp. According to the experimental results of the prototype circuit with an AC input voltage of 110 volts, the presented single-stage LED power supply offers high power factor (PF > 0.99), low input-current total harmonic distortion factor (THD < 3%), and high efficiency (>89%). In addition, this paper used the built-in Bluetooth wireless communication function of a smart tablet or smart phone to fulfill remote dimming control. By changing the duty ratio of the control signal, we could realize remote dimming control of 20% to 100% of the output LED street-light lamp power.
Highlights
The street-light lamps widely installed on roads, streets, parks, squares, public places, and decorative outdoor lighting areas have the function of providing night lighting, being are usually lit at night or in the dark and extinguished in the early morning
The first stage is an AC-DC power converter with power factor correction (PFC) function and the second stage is a DC-DC power converter to provide the rated DC voltage and current required by the Light-emitting diode (LED) street-light lamp [5,6,7,8]
This paper proposes a single‐stage AC‐DC high power factor power supply (HPFPS) based on buck‐type power con‐
Summary
The street-light lamps widely installed on roads, streets, parks, squares, public places, and decorative outdoor lighting areas have the function of providing night lighting, being are usually lit at night or in the dark and extinguished in the early morning. The traditional street lighting source is a high-pressure mercury lamp featuring low installation cost. It has the disadvantages of poor luminous efficiency and high energy consumption, as well as the problems of mercury pollution and being difficult to start up in low-temperature circumstances. The first stage is an AC-DC power converter with power factor correction (PFC) function and the second stage is a DC-DC power converter to provide the rated DC voltage and current required by the LED street-light lamp [5,6,7,8]. The traditional two-stage AC-DC high power factor power supply (HPFPS) for providing an LED street-light lamp includes an AC-DC boost converter as the first-stage circuit featuring
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