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9903-091 Woodward 功能好
9903-091 Woodward 功能好
9903-091 Woodward 功能好
眾所周知，D類音頻放大器有很多長處，而其間重要的一個長處就是它的功率要遠比AB類放大器的功率高。現在雖然我們都承認這一長處，可是關於其間的了解和知道還是很不相同的。不少人都以為AB類放大器的功率一般是70－80％，而D類放大器的功率則能夠到達80－90％。所以D類放大器的功率大約能夠比AB類放大器功率高10－15％左右。
如果是評論在大功率輸出時的功率，那麼這個結論是不錯的。可是，在幾乎所有實際使用的音頻功率放大器並不是一向作業在大功率輸出的狀況下，尤其是在播映音樂是就更不是如此。
關於一個音頻信號，我們一般選用峰值要素（峰值/有用值）來代表它的峰值功率和均勻的有用值功率的份額。例如，關於語音信號來說，它的峰值要素大約為8dB。可是關於音樂信號來說這個份額就有很大的不同。大部分音樂信號的峰值要素在15－16dB左右。這能夠用圖1的示意圖來闡明。
圖1. 音樂信號的峰值要素和正弦波的峰值要素的比較。
從圖中能夠看出，假定音樂信號和正弦波的峰值功率都是2瓦，由於正弦波的峰值功率和有用值功率之比為3dB，所以正弦波的均勻功率為1瓦，而音樂信號的峰值要素大約為15dB，所以其均勻功率就只要63毫瓦。
在播映音樂信號時，用AB類放大器和D類放大器二者在功率上的不同就不是簡略的15％的不同了。我們能夠從兩種放大器的功率曲線來看出。
從圖中能夠看出，雖然AB類放大器的功率在滿功率輸出時的功率也能夠到達78％，而D類放大器在滿功率時的功率也只要86％。可是它們在低輸出功率時的功率就相差很大，在輸出功率為2瓦時，AB類的功率只要24％，而D類放大器的功率依然有82％。D類放大器的功率要比AB類放大器的功率高出3.4倍。而在播映音樂時，大多數時間是處於低功率的狀況。所以D類放大器在功率上的優勢就非常明顯了。
假定其峰值功率為2瓦，那麼關於正弦波的均勻功率就是1瓦，而關於峰值要素為9dB的語音信號，其均勻功率就只要0.25瓦，而關於峰值要素為15dB的音樂信號來說，其均勻功率就只要0.063瓦。它們在用AB類和D類放大器播映的時分，在功率上的差異就非常巨大。
這能夠很形象地用下面的餅圖來闡明：
從這個圖中能夠看出，AB類放大器只要12％的輸入功率變成有用音頻功率輸出了，而有將近88％的輸入功率都變成熱量耗散了。而D類放大器的75％輸入功率都變成了有用的音頻輸出功率，只要25％的輸入功率變成熱量耗散了。正由於如此，所以具有相當大輸出功率的D類放大器都不需求選用散熱器。這也是D類放大器的另一個大的長處。
P/N
Woodward 126443
Woodward 376104
Woodward 5441689
Woodward 1326-183
Woodward 1691-143+B842
Woodward 1720-707
Woodward 1720-713
Woodward 1720-719
Woodward 1751-147D
Woodward 1751-6058B
Woodward 1751-673
Woodward 1751-675
Woodward 1785-655
Woodward 1790-789
Woodward 1790-791
Woodward 1790-9026
Woodward 1803-105
Woodward 1843-325
Woodward 1886-313
Woodward 1887-031
Woodward 3005-510
Woodward 3005-517
Woodward 3052-141
Woodward 3081-847
Woodward 31902-02
Woodward 3313-055
Woodward 3462-757
Woodward 3462-757
Woodward 3462-758
Woodward 376-104
Woodward 4199J51
Woodward 5403-535
Woodward 5403-536
Woodward 5403-616
Woodward 5403-824
Woodward 5403-975
Woodward 5403-977
Woodward 5403-978
Woodward 5405-818
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Woodward 5410-995
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Woodward 5415-623
Woodward 5415-625
Woodward 5415-625
Woodward 5415-703
Woodward 5415-737
Woodward 5415-738
Woodward 5415-816
Woodward 5415-851
Woodward 5415-852
Woodward 5415-856
Woodward 5415-858
Woodward 5415-966
Woodward 5416-190
Woodward 5416-337
Woodward 5416-338
Woodward 5416-338
Woodward 5416-339
Woodward 5416-351
Woodward 5416-352
Woodward 5417-032
Woodward 5417-040
Woodward 5417-173
Woodward 5417-175
Woodward 5417-176
Woodward 5417-413
Woodward 5417-417
Woodward 5421-112
Woodward 5421-123
Woodward 5421-178
Woodward 5430-856
Woodward 5430-929
Woodward 5432-039
Woodward 5432-157
Woodward 5434-334
Woodward 5437-027
Woodward 5437-051
Woodward 5437-076
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Woodward 5437-173
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Woodward 5439-927
Woodward 5439-929
Woodward 5439-966
Woodward 5439-984
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Woodward 5461-117
Woodward 5461-290
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Woodward 5461-331
Woodward 5461-622+B2
Woodward 5461-639
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Woodward 5462-893
Woodward 5462-896
Woodward 5462-916
Woodward 5462-917
Woodward 5462-944
Woodward 5462-948
Woodward 5462-966
Woodward 5463-033
Woodward 5463-034
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Woodward 5463-790
Woodward 5463-796
Woodward 5463-834
Woodward 5463-870
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Woodward 5463-880
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Woodward 8234-167O
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