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Improving efficiency of tri-state boost converters for audio applications using dynamic freewheeling

Vos, S.P. de (2018) Improving efficiency of tri-state boost converters for audio applications using dynamic freewheeling.

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Abstract:The present solution for high-power portable audio is to use a boost converter followed by a class-D amplifier. This report investigates driving a speaker directly with a boost converter to increase efficiency. The challenge is that a boost converter has an inverse response at high frequencies, limiting audio quality. This report combines two existing approaches: A bridge configuration is used to remove direct current into the speaker. Combined with a tri-state topology that eliminates the inversion, at the cost of higher inductor current and losses. A new control scheme is proposed that limits excess inductor current, resulting in better efficiency. A parameter sweep was done to show that using the dynamic tri-state design, excess current can be traded for audio quality, where a sweet spot can be found that saves energy without degrading performance significantly. Simulations show that he proposed scheme allows increased loop gain, resulting in a THD of 0.51%. It is only 7 percent point less efficient than a conventional boost converter. This makes it an appealing alternative to a separate boost converter and amplifier.
Item Type:Essay (Bachelor)
Faculty:EEMCS: Electrical Engineering, Mathematics and Computer Science
Subject:53 electrotechnology
Programme:Electrical Engineering BSc (56953)
Link to this item:http://purl.utwente.nl/essays/75270
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