Abstract
Light emitted diode (LED) is becoming more popular in the illumination field, and the design of LED lighting is generally made to provide illumination at lower power usage, helping save energy. A power electronic converter is needed to provide the power conversion for these LEDs to meet high efficiency, reduce components, and have low voltage ripple magnitude. The power supply for LED is revisited in this paper. The LEDs connected in series with diode, transistor, or inductor paths are examined. The formulation for each of the cases is described, including the classical converters of buck, boost, buck–boost, and Ćuk. The circuit reductions of the classic circuit, circuit without the capacitor, and without a freewheeling diode are studied. Using LED to replace freewheeling diodes is proposed for circuit component reduction. General equations for different connection paths have been developed. The efficiency and output ripple amplitude of the proposed power converters are investigated. Analytical study shows that the efficiency of proposed circuits can be high and voltage ripple magnitude of proposed circuits can be low. The results show that the proposed circuit topologies can be easily adapted to design LED lighting, which can meet the criteria of high efficiency, minimum components, and low-voltage ripple magnitude at the same time.
Highlights
Light emitted diode (LED) is an emerging product to replace conventional lighting and has gained acceptance in the lighting market, which started from a light source to being used in decorative, display, and public lighting applications, such as display lighting, spotlight, streetlight, and general lighting [1,2,3,4].The power levels of 1 W, 3 W, and 5 W are very common
To overcome the aforementioned drawbacks and figure out an appropriate circuit topology that has high efficiency without a complicated control circuit, low component count, and low output ripple amplitude, this paper proposes a new family of power converters for the LED lighting field
We propose a new family of power converters to the low-power LED lighting for lighting and special effect design
Summary
LED is an emerging product to replace conventional lighting and has gained acceptance in the lighting market, which started from a light source to being used in decorative, display, and public lighting applications, such as display lighting, spotlight, streetlight, and general lighting [1,2,3,4]. Reference [13] proposed a single-stage LED driver based on buck topology, which adopts current path control switches to improve efficiency and power factor. To overcome the aforementioned drawbacks and figure out an appropriate circuit topology that has high efficiency without a complicated control circuit, low component count, and low output ripple amplitude, this paper proposes a new family of power converters for the LED lighting field. They are modified versions of the buck, boost, buck–boost, and Ćuk converter to provide the LED power excitation.
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