9903-091 Woodward 功能好

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9903-091 Woodward 功能好

9903-091 Woodward 功能好

9903-091 Woodward 功能好

众所周知，D类音频放大器有很多长处，而其间重要的一个长处就是它的功率要远比AB类放大器的功率高。现在虽然我们都承认这一长处，可是关于其间的了解和知道还是很不相同的。不少人都以为AB类放大器的功率一般是70－80％，而D类放大器的功率则能够到达80－90％。所以D类放大器的功率大约能够比AB类放大器功率高10－15％左右。

　　如果是评论在大功率输出时的功率，那么这个结论是不错的。可是，在几乎所有实际使用的音频功率放大器并不是一向作业在大功率输出的状况下，尤其是在播映音乐是就更不是如此。

　　关于一个音频信号，我们一般选用峰值要素（峰值/有用值）来代表它的峰值功率和均匀的有用值功率的份额。例如，关于语音信号来说，它的峰值要素大约为8dB。可是关于音乐信号来说这个份额就有很大的不同。大部分音乐信号的峰值要素在15－16dB左右。这能够用图1的示意图来阐明。

　　图1. 音乐信号的峰值要素和正弦波的峰值要素的比较。

　　从图中能够看出，假定音乐信号和正弦波的峰值功率都是2瓦，由于正弦波的峰值功率和有用值功率之比为3dB，所以正弦波的均匀功率为1瓦，而音乐信号的峰值要素大约为15dB，所以其均匀功率就只要63毫瓦。

　　在播映音乐信号时，用AB类放大器和D类放大器二者在功率上的不同就不是简略的15％的不同了。我们能够从两种放大器的功率曲线来看出。

　　从图中能够看出，虽然AB类放大器的功率在满功率输出时的功率也能够到达78％，而D类放大器在满功率时的功率也只要86％。可是它们在低输出功率时的功率就相差很大，在输出功率为2瓦时，AB类的功率只要24％，而D类放大器的功率依然有82％。D类放大器的功率要比AB类放大器的功率高出3.4倍。而在播映音乐时，大多数时间是处于低功率的状况。所以D类放大器在功率上的优势就非常明显了。

　　假定其峰值功率为2瓦，那么关于正弦波的均匀功率就是1瓦，而关于峰值要素为9dB的语音信号，其均匀功率就只要0.25瓦，而关于峰值要素为15dB的音乐信号来说，其均匀功率就只要0.063瓦。它们在用AB类和D类放大器播映的时分，在功率上的差异就非常巨大。

　　这能够很形象地用下面的饼图来阐明：

　　从这个图中能够看出，AB类放大器只要12％的输入功率变成有用音频功率输出了，而有将近88％的输入功率都变成热量耗散了。而D类放大器的75％输入功率都变成了有用的音频输出功率，只要25％的输入功率变成热量耗散了。正由于如此，所以具有相当大输出功率的D类放大器都不需求选用散热器。这也是D类放大器的另一个大的长处。

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Woodward 126443

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