一种新的d类立体声音频放大器控制策略

K. Cho, W. Oh, Hai Xu, Heejun Kim
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摘要

本文介绍了一种采用三相全桥电路直接控制扬声器电流的d类立体声音频放大器。提出了一种新的开关控制放大器电流的方法。所提出的开关策略是死区时间最小化方法的改进版本,它可以减少传统的死区时间最小化方法在电流极性改变时经常出现的电流间歇。该方法并不总是适用于死区时间,这与传统方法在每个电流极性变化点上应用死区时间不同。本文对立体操作的具体策略进行了探讨。实验结果验证了该控制策略的有效性。
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A Novel Control Strategy of the Class-D Stereo Audio Amplifier
This paper presents a class-D stereo audio amplifier that controls directly the current of speakers using three phase full bridge circuit. And a new switching method for the current control of the amplifier is proposed. The proposed switching strategy is an improved version of the dead time minimization method, which can reduce current intermittence that commonly occurs with the conventional dead time minimization method whenever the current changes polarity. Dead time is not always adapted in the proposed method, which makes it different from the conventional practice of applying dead time in every current polarity changing point. In this paper, the specific strategy for the stereo operation is discussed. With the experimental results, usefulness of the control strategy is confirmed.
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