Higher Power Density Amplifiers

Abstract

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Tracking Multilevel Power Supplies for Class-D Audio Amplifiers

“…When properly designed, the ripple current can charge/discharge C oss,q during the dead-time period resulting in reduced voltage switching or zero voltage switching. This has been covered in depth in [21,22]. Thus P sw is dependent on the ripple current, the switching frequency, and the supply voltage.…”

Optimal Control of a High Frequency Class-D Amplifier

“…This is typically unwanted in a class-D amplifier since the damped oscillation it creates, impedes the ability to improve the fidelity when using classical control since an increase in the gain at the resonance frequency will also increase the resonance. However, in modern control, this problem is easily solved, and thus the resonance peak can be used to improve the distribution of heat in the power stage by moving losses from the switching devices to the filter [19].…”