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2024年11月29日 星期五

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9903-226 Woodward质量好

9903-226 Woodward质量好

9903-226 Woodward质量好

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。


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

Woodward 5405-819

Woodward 5410-995

Woodward 5412-033

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

Woodward 5437-077

Woodward 5437-078

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Woodward 5437-081

Woodward 5437-092

Woodward 5437-173

Woodward 5437-281

Woodward 5437-282

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Woodward 5437-406

Woodward 5437-417

Woodward 5437-418

Woodward 5437-465

Woodward 5437-484

Woodward 5437-523

Woodward 5437-524

Woodward 5437-672

Woodward 5437-686

Woodward 5437-687

Woodward 5437-843

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Woodward 5437-845

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Woodward 5439-076

Woodward 5439-273

Woodward 5439-555

Woodward 5439-730

Woodward 5439-751

Woodward 5439-754

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Woodward 5439-760

Woodward 5439-764

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Woodward 5439-800

Woodward 5439-861

Woodward 5439-927

Woodward 5439-929 

Woodward 5439-966

Woodward 5439-984

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Woodward 5441-407

Woodward 5441-409

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Woodward 5448-906

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Woodward 5450-106

Woodward 5453-278

Woodward 5453-750

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Woodward 5460-735

Woodward 5460-796

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Woodward 5461-002

Woodward 5461-062

Woodward 5461-082

Woodward 5461-083

Woodward 5461-086

Woodward 5461-088

Woodward 5461-117

Woodward 5461-290

Woodward 5461-292

Woodward 5461-331

Woodward 5461-622+B2

Woodward 5461-639

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Woodward 5462-117

Woodward 5462-236

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Woodward 5462-292

Woodward 5462-336

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Woodward 5462-443

Woodward 5462-472

Woodward 5462-482

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Woodward 5462-578

Woodward 5462-581

Woodward 5462-584

Woodward 5462-651

Woodward 5462-718

Woodward 5462-749

Woodward 5462-750

Woodward 5462-753

Woodward 5462-756

Woodward 5462-757

Woodward 5462-758

Woodward 5462-762

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

Woodward 5463-089

Woodward 5463-120

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Woodward 5463-154 

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Woodward 5463-561 

Woodward 5463-579

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Woodward 5463-598

Woodward 5463-600

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Woodward 5463-631

Woodward 5463-716

Woodward 5463-729

Woodward 5463-750

Woodward 5463-758

Woodward 5463-779

Woodward 5463-780

Woodward 5463-781

Woodward 5463-783

Woodward 5463-785

Woodward 5463-786

Woodward 5463-787

Woodward 5463-790

Woodward 5463-796

Woodward 5463-834

Woodward 5463-870

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Woodward 5463-877

Woodward 5463-880

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Woodward 5463-887

Woodward 5464-015

Woodward 5464-017

Woodward 5464-018

Woodward 5464-021

Woodward 5464-024

Woodward 5464-025

Woodward 5464-033

Woodward 5464-034

Woodward 5464-050

Woodward 5464-114

Woodward 5464-205

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Woodward 5464-243

Woodward 5464-275

Woodward 5464-301

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Woodward 5464-334

Woodward 5464-334

Woodward 5464-335

Woodward 5464-337

Woodward 5464-337

Woodward 5464-340

Woodward 5464-348

Woodward 5464-414

Woodward 5464-428

Woodward 5464-439

Woodward 5464-444

Woodward 5464-458

Woodward 5464-472

Woodward 5464-473

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Woodward 5464-485

Woodward 5464-536

Woodward 5464-538

Woodward 5464-541

Woodward 5464-542

Woodward 5464-549

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Woodward 5464-554

Woodward 5464-555

Woodward 5464-596

Woodward 5464-643

Woodward 5464-645

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Woodward 5464-653

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Woodward 5464-660

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Woodward 5464-674

Woodward 5464-674

Woodward 5464-676

Woodward 5464-688

Woodward 5464-697

Woodward 5464-716A

Woodward 5464-725

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Woodward 5464-768

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Woodward 5466-006

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Woodward 5466-026

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Woodward 5466-458

Woodward 5500-018

Woodward 5500-134

Woodward 5500-159C

Woodward 5500-510

Woodward 5500-559

Woodward 5500-563

Woodward 5501-003

Woodward 5501-340

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Woodward 5501-367

Woodward 5501-376

Woodward 5501-411

Woodward 5501-428

Woodward 5501-432

Woodward 5501-465

Woodward 5501-466

Woodward 5501-469

Woodward 5501-470

Woodward 5501-471

Woodward 5501-510

Woodward 5503-173

Woodward 5503-279

Woodward 5503-282

Woodward 5503-335

Woodward 6945-377

Woodward 8200-015

Woodward 8200-019

Woodward 8200-177

Woodward 8200-203

Woodward 8200-226

Woodward 8200-314

Woodward 8220-805

Woodward 8226-043

Woodward 8230-568

Woodward 8230-805

Woodward 8230-815

Woodward 8230-827

Woodward 8230-840

Woodward 8230-841

Woodward 8230-896

Woodward 8230-898

Woodward 8234-167O

Woodward 8234-213

Woodward 8234-346A

Woodward 8236-026

Woodward 8236-027

Woodward 8236-039

Woodward 8236-039

Woodward 8236-043

Woodward 8236-144

Woodward 8236-144D

Woodward 8238-002

Woodward 8238-007

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Woodward 8238-009

Woodward 8239-001

Woodward 8239-002

Woodward 8239-005

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Woodward 8239-007

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Woodward 8239-015

Woodward 8239-016

Woodward 8239-939

Woodward 8240-084

Woodward 8250-022

Woodward 8250-226

Woodward 8250-421

Woodward 8250-501

Woodward 8250-570

Woodward 8250-807

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Woodward 8256-021

Woodward 8270-092

Woodward 8270-122

Woodward 8270-201

Woodward 8270-741

Woodward 8270-758

Woodward 8270-768

Woodward 8271-147

Woodward 8271-467

Woodward 8271-472

Woodward 8271-652

Woodward 8271-674

Woodward 8271-872

Woodward 8272-385

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Woodward 8272-464

Woodward 8272-684

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Woodward 8272-695

Woodward 8272-720

Woodward 8272-781A

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Woodward 8273-276

Woodward 8280-071

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Woodward 8290-195

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