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High-brightness light emitting diodes (HB-LED) are used in various applications in preference to conventional light bulbs due to following merits: eco-friendly nature, high luminous efficacy, prolonged life, compactness and low heat dissipation. This work presents the boost converter fed dimmable light emitting diode where illumination control is required. The proposed work uses pulse width modulated...
LED lighting sources have been used in several applications than established lighting sources due to their high luminous efficiency, environmental friendly, long life, compact size, and not affected by cold temperature. This paper deals with the design of buck-boost LED driver for wide input voltage applications. The proposed LED driver is a combination of uncontrolled rectifier followed by buck-boost...
Now a day's use of portable devices increasing more. Such as cellular phones, digital cameras and high efficient power managing modules etc. are demanding for low output voltage ripple with fast transient response. The terminal voltage of the battery used in portable applications varies particularly depending on state of their charging conditions. In this paper, Li-ion battery is considered that provides...
In this paper, author proposes study of two-loop voltage mode controlled (TVMC) buck converter for improved transient and dynamic performance under line and load disturbances. Buck converter with voltage mode control will improve efficiency, but transient response is sluggish. It requires large filter capacitor. Two-loop voltage control technique is proposed to improve output voltage regulation irrespective...
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