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Class D amplifiers are becoming the most feasible solution for embedded audio application. However, distortions due to the non-linear nature of switching stage are the main drawback for this amplifier topology. This paper discusses the design and implementation of high fidelity audio class D using sliding mode control scheme. This design method proves to be a cost effective solution for industrial...
A dimmable electronic ballast for 250W high pressure sodium (HPS) lamp, which is used in street lighting, is designed in this paper. Normally used dimming methods for electronic ballast are introduced and compared. Dimming control method by varying switching frequency is utilized in the designed ballast. A simple method to realize closed-loop control of lamp power is adopted. The interface circuit...
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