USB线的内部结构是什么?我想看能否做的更方便使用些 usb 的电线结构除了4根（正负极和两根数据线）还有一些线是...
\u6807\u51c6USB\u7ebf\u7684\u7ed3\u6784\u662f\u4ec0\u4e48?\u5305\u542b\u54ea\u4e9b\u90e8\u5206?\u5404\u90e8\u5206\u7684\u4f5c\u7528\u662f\u4ec0\u4e48?\u53f0\uff0c\u5176\u91cd\u8981\u6027\u4e0d\u8a00\u800c\u55bb\u3002\u800c\u4e0b\u9762\u6211\u4eec\u5c31\u4ee5\u56fe\u89e3\u7684\u5f62\u5f0f\u5e26\u4f60\u6765\u5168\u9762\u4e86\u89e3\u4e3b\u677f\u3002
\u4e00\u3001\u4e3b\u677f\u56fe\u89e3 \u4e00\u5757\u4e3b\u677f\u4e3b\u8981\u7531\u7ebf\u8def\u677f\u548c\u5b83\u4e0a\u9762\u7684\u5404\u79cd\u5143\u5668\u4ef6\u7ec4\u62101.\u7ebf\u8def\u677f PCB\u5370\u5236\u7535\u8def\u677f\u662f\u6240\u6709\u7535\u8111\u677f\u5361\u6240\u4e0d\u53ef\u6216\u7f3a\u7684\u4e1c\u4e1c\u3002\u5b83\u5b9e\u9645\u662f\u7531\u51e0\u5c42\u6811\u8102\u6750\u6599\u7c98\u5408\u5728\u4e00\u8d77\u7684\uff0c\u5185\u90e8\u91c7\u7528\u94dc\u7b94\u8d70\u7ebf\u3002\u4e00\u822c\u7684PCB\u7ebf\u8def\u677f\u5206\u6709\u56db\u5c42\uff0c\u6700\u4e0a\u548c\u6700\u4e0b\u7684\u4e24\u5c42\u662f\u4fe1\u53f7\u5c42\uff0c\u4e2d\u95f4\u4e24\u5c42\u662f\u63a5\u5730\u5c42\u548c\u7535\u6e90\u5c42\uff0c\u5c06\u63a5\u5730\u548c\u7535\u6e90\u5c42\u653e\u5728\u4e2d\u95f4\uff0c\u8fd9\u6837\u4fbf\u53ef\u5bb9\u6613\u5730\u5bf9\u4fe1\u53f7\u7ebf\u4f5c\u51fa\u4fee\u6b63\u3002\u800c\u4e00\u4e9b\u8981\u6c42\u8f83\u9ad8\u7684\u4e3b\u677f\u7684\u7ebf\u8def\u677f\u53ef\u8fbe\u52306-8\u5c42\u6216\u66f4\u591a\u3002\u4e3b\u677f(\u7ebf\u8def\u677f)\u662f\u5982\u4f55\u5236\u9020\u51fa\u6765\u7684\u5462\uff1fPCB\u7684\u5236\u9020\u8fc7\u7a0b\u7531\u73bb\u7483\u73af\u6c27\u6811\u8102(Glass Epoxy)\u6216\u7c7b\u4f3c\u6750\u8d28\u5236\u6210\u7684PCB\u201c\u57fa\u677f\u201d\u5f00\u59cb\u3002\u5236\u4f5c\u7684\u7b2c\u4e00\u6b65\u662f\u5149\u7ed8\u51fa\u96f6\u4ef6\u95f4\u8054\u673a\u7684\u5e03\u7ebf\uff0c\u5176\u65b9\u6cd5\u662f\u91c7\u7528\u8d1f\u7247\u8f6c\u5370(Subtractive transfer)\u7684\u65b9\u5f0f\u5c06\u8bbe\u8ba1\u597d\u7684PCB\u7ebf\u8def\u677f\u7684\u7ebf\u8def\u5e95\u7247\u201c\u5370\u5237\u201d\u5728\u91d1\u5c5e\u5bfc\u4f53\u4e0a\u3002\u8fd9\u9879\u6280\u5de7\u662f\u5c06\u6574\u4e2a\u8868\u9762\u94fa\u4e0a\u4e00\u5c42\u8584\u8584\u7684\u94dc\u7b94\uff0c\u5e76\u4e14\u628a\u591a\u4f59\u7684\u90e8\u4efd\u7ed9\u6d88\u9664\u3002\u800c\u5982\u679c\u5236\u4f5c\u7684\u662f\u53cc\u9762\u677f\uff0c\u90a3\u4e48PCB\u7684\u57fa\u677f\u4e24\u9762\u90fd\u4f1a\u94fa\u4e0a\u94dc\u7b94\u3002\u800c\u8981\u505a\u591a\u5c42\u677f\u53ef\u5c06\u505a\u597d\u7684\u4e24\u5757\u53cc\u9762\u677f\u7528\u7279\u5236\u7684\u7c98\u5408\u5242\u201c\u538b\u5408\u201d\u8d77\u6765\u5c31\u884c\u4e86\u3002\u63a5\u4e0b\u6765\uff0c\u4fbf\u53ef\u5728PCB\u677f\u4e0a\u8fdb\u884c\u63a5\u63d2\u5143\u5668\u4ef6\u6240\u9700\u7684\u94bb\u5b54\u4e0e\u7535\u9540\u4e86\u3002\u5728\u6839\u636e\u94bb\u5b54\u9700\u6c42\u7531\u673a\u5668\u8bbe\u5907\u94bb\u5b54\u4e4b\u540e\uff0c\u5b54\u74a7\u91cc\u5934\u5fc5\u987b\u7ecf\u8fc7\u7535\u9540(\u9540\u901a\u5b54\u6280\u672f\uff0cPlated- Through-Hole technology\uff0cPTH)\u3002\u5728\u5b54\u74a7\u5185\u90e8\u4f5c\u91d1\u5c5e\u5904\u7406\u540e\uff0c\u53ef\u4ee5\u8ba9\u5185\u90e8\u7684\u5404\u5c42\u7ebf\u8def\u80fd\u591f\u5f7c\u6b64\u8fde\u63a5\u3002\u5728\u5f00\u59cb\u7535\u9540\u4e4b\u524d\uff0c\u5fc5\u987b\u5148\u6e05\u6389\u5b54\u5185\u7684\u6742\u7269\u3002\u8fd9\u662f\u56e0\u4e3a\u6811\u8102\u73af\u6c27\u7269\u5728\u52a0\u70ed\u540e\u4f1a\u4ea7\u751f\u4e00\u4e9b\u5316\u5b66\u53d8\u5316\uff0c\u800c\u5b83\u4f1a\u8986\u76d6\u4f4f\u5185\u90e8PCB\u5c42\uff0c\u6240\u4ee5\u8981\u5148\u6e05\u6389\u3002\u6e05\u9664\u4e0e\u7535\u9540\u52a8\u4f5c\u90fd\u4f1a\u5728\u5316\u5b66\u8fc7\u7a0b\u4e2d\u5b8c\u6210\u3002\u63a5\u4e0b\u6765\uff0c\u9700\u8981\u5c06\u963b\u710a\u6f06(\u963b\u710a\u6cb9\u58a8)\u8986\u76d6\u5728\u6700\u5916\u5c42\u7684\u5e03\u7ebf\u4e0a\uff0c\u8fd9\u6837\u4e00\u6765\u5e03\u7ebf\u5c31\u4e0d\u4f1a\u63a5\u89e6\u5230\u7535\u9540\u90e8\u4efd\u4e86\u3002\u7136\u540e\u662f\u5c06\u5404\u79cd\u5143\u5668\u4ef6\u6807\u793a\u7f51\u5370\u5728\u7ebf\u8def\u677f\u4e0a\uff0c\u4ee5\u6807\u793a\u5404\u96f6\u4ef6\u7684\u4f4d\u7f6e\uff0c\u5b83\u4e0d\u80fd\u591f\u8986\u76d6\u5728\u4efb\u4f55\u5e03\u7ebf\u6216\u662f\u91d1\u624b\u6307\u4e0a\uff0c\u4e0d\u7136\u53ef\u80fd\u4f1a\u51cf\u4f4e\u53ef\u710a\u6027\u6216\u662f\u7535\u6d41\u8fde\u63a5\u7684\u7a33\u5b9a\u6027\u3002\u6b64\u5916\uff0c\u5982\u679c\u6709\u91d1\u5c5e\u8fde\u63a5\u90e8\u4f4d\uff0c\u8fd9\u65f6\u201c\u91d1\u624b\u6307\u201d\u90e8\u4efd\u901a\u5e38\u4f1a\u9540\u4e0a\u91d1\uff0c\u8fd9\u6837\u5728\u63d2\u5165\u6269\u5145\u69fd\u65f6\uff0c\u624d\u80fd\u786e\u4fdd\u9ad8\u54c1\u8d28\u7684\u7535\u6d41\u8fde\u63a5\u3002\u6700\u540e\uff0c\u5c31\u662f\u6d4b\u8bd5\u4e86\u3002\u6d4b\u8bd5PCB\u662f\u5426\u6709\u77ed\u8def\u6216\u662f\u65ad\u8def\u7684\u72b6\u51b5\uff0c\u53ef\u4ee5\u4f7f\u7528\u5149\u5b66\u6216\u7535\u5b50\u65b9\u5f0f\u6d4b\u8bd5\u3002\u5149\u5b66\u65b9\u5f0f\u91c7\u7528\u626b\u63cf\u4ee5\u627e\u51fa\u5404\u5c42\u7684\u7f3a\u9677\uff0c\u7535\u5b50\u6d4b\u8bd5\u5219\u901a\u5e38\u7528\u98de\u9488\u63a2\u6d4b\u4eea (Flying-Probe)\u6765\u68c0\u67e5\u6240\u6709\u8fde\u63a5\u3002\u7535\u5b50\u6d4b\u8bd5\u5728\u5bfb\u627e\u77ed\u8def\u6216\u65ad\u8def\u6bd4\u8f83\u51c6\u786e\uff0c\u4e0d\u8fc7\u5149\u5b66\u6d4b\u8bd5\u53ef\u4ee5\u66f4\u5bb9\u6613\u4fa6\u6d4b\u5230\u5bfc\u4f53\u95f4\u4e0d\u6b63\u786e\u7a7a\u9699\u7684\u95ee\u9898\u3002\u7ebf\u8def\u677f\u57fa\u677f\u505a\u597d\u540e\uff0c\u4e00\u5757\u6210\u54c1\u7684\u4e3b\u677f\u5c31\u662f\u5728PCB\u57fa\u677f\u4e0a\u6839\u636e\u9700\u8981\u88c5\u5907\u4e0a\u5927\u5927\u5c0f\u5c0f\u7684\u5404\u79cd\u5143\u5668\u4ef6\u2014\u5148\u7528SMT\u81ea\u52a8\u8d34\u7247\u673a\u5c06IC\u82af\u7247\u548c\u8d34\u7247\u5143\u4ef6\u201c\u710a\u63a5\u4e0a\u53bb\uff0c\u518d\u624b\u5de5\u63a5\u63d2\u4e00\u4e9b\u673a\u5668\u5e72\u4e0d\u4e86\u7684\u6d3b\uff0c\u901a\u8fc7\u6ce2\u5cf0/\u56de\u6d41\u710a\u63a5\u5de5\u827a\u5c06\u8fd9\u4e9b\u63d2\u63a5\u5143\u5668\u4ef6\u7262\u7262\u56fa\u5b9a\u5728PCB\u4e0a\uff0c\u4e8e\u662f\u4e00\u5757\u4e3b\u677f\u5c31\u751f\u4ea7\u51fa\u6765\u4e86\u3002\u53e6\u5916\uff0c\u7ebf\u8def\u677f\u8981\u60f3\u5728\u7535\u8111\u4e0a\u505a\u4e3b\u677f\u4f7f\u7528\uff0c\u8fd8\u9700\u5236\u6210\u4e0d\u540c\u7684\u677f\u578b\u3002\u5176\u4e2dAT\u677f\u578b\u662f\u4e00\u79cd\u6700\u57fa\u672c\u677f\u578b\uff0c\u5176\u7279\u70b9\u662f\u7ed3\u6784\u7b80\u5355\u3001\u4ef7\u683c\u4f4e\u5ec9\uff0c\u5176\u6807\u51c6\u5c3a\u5bf8\u4e3a 33.2cmX30.48cm\uff0cAT\u4e3b\u677f\u9700\u4e0eAT\u673a\u7bb1\u7535\u6e90\u7b49\u76f8\u642d\u914d\u4f7f\u7528\uff0c\u73b0\u5df2\u88ab\u6dd8\u6c70\u3002\u800cATX\u677f\u578b\u5219\u50cf\u4e00\u5757\u6a2a\u7f6e\u7684\u5927AT\u677f\uff0c\u8fd9\u6837\u4fbf\u4e8eATX\u673a\u7bb1\u7684\u98ce\u6247\u5bf9 CPU\u8fdb\u884c\u6563\u70ed\uff0c\u800c\u4e14\u677f\u4e0a\u7684\u5f88\u591a\u5916\u90e8\u7aef\u53e3\u90fd\u88ab\u96c6\u6210\u5728\u4e3b\u677f\u4e0a\uff0c\u5e76\u4e0d\u50cfAT\u677f\u4e0a\u7684\u8bb8\u591aCOM\u53e3\u3001\u6253\u5370\u53e3\u90fd\u8981\u4f9d\u9760\u8fde\u7ebf\u624d\u80fd\u8f93\u51fa\u3002\u53e6\u5916ATX\u8fd8\u6709\u4e00\u79cdMicro ATX\u5c0f\u677f\u578b\uff0c\u5b83\u6700\u591a\u53ef\u652f\u63014\u4e2a\u6269\u5145\u69fd\uff0c\u51cf\u5c11\u4e86\u5c3a\u5bf8\uff0c\u964d\u4f4e\u4e86\u7535\u8017\u4e0e\u6210\u672c\u30022.\u5317\u6865\u82af\u7247\u82af\u7247\u7ec4(Chipset)\u662f\u4e3b\u677f\u7684\u6838\u5fc3\u7ec4\u6210\u90e8\u5206\uff0c\u6309\u7167\u5728\u4e3b\u677f\u4e0a\u7684\u6392\u5217\u4f4d\u7f6e\u7684\u4e0d\u540c\uff0c\u901a\u5e38\u5206\u4e3a\u5317\u6865\u82af\u7247\u548c\u5357\u6865\u82af\u7247\uff0c\u5982Intel\u7684i845GE\u82af\u7247\u7ec4\u7531 82845GE GMCH\u5317\u6865\u82af\u7247\u548cICH4(FW82801DB)\u5357\u6865\u82af\u7247\u7ec4\u6210\uff1b\u800cVIA KT400\u82af\u7247\u7ec4\u5219\u7531KT400\u5317\u6865\u82af\u7247\u548cVT8235\u7b49\u5357\u6865\u82af\u7247\u7ec4\u6210(\u4e5f\u6709\u5355\u82af\u7247\u7684\u4ea7\u54c1\uff0c\u5982SIS630/730\u7b49)\uff0c\u5176\u4e2d\u5317\u6865\u82af\u7247\u662f\u4e3b\u6865\uff0c\u5176\u4e00\u822c\u53ef\u4ee5\u548c\u4e0d\u540c\u7684\u5357\u6865\u82af\u7247\u8fdb\u884c\u642d\u914d\u4f7f\u7528\u4ee5\u5b9e\u73b0\u4e0d\u540c\u7684\u529f\u80fd\u4e0e\u6027\u80fd\u3002\u5317\u6865\u82af\u7247\u4e00\u822c\u63d0\u4f9b\u5bf9CPU\u7684\u7c7b\u578b\u548c\u4e3b\u9891\u3001\u5185\u5b58\u7684\u7c7b\u578b\u548c\u6700\u5927\u5bb9\u91cf\u3001ISA/PCI/AGP\u63d2\u69fd\u3001ECC\u7ea0\u9519\u7b49\u652f\u6301\uff0c\u901a\u5e38\u5728\u4e3b\u677f\u4e0a\u9760\u8fd1CPU\u63d2\u69fd\u7684\u4f4d\u7f6e\uff0c\u7531\u4e8e\u6b64\u7c7b\u82af\u7247\u7684\u53d1\u70ed\u91cf\u4e00\u822c\u8f83\u9ad8\uff0c\u6240\u4ee5\u5728\u6b64\u82af\u7247\u4e0a\u88c5\u6709\u6563\u70ed\u7247\u30023.\u5357\u6865\u82af\u7247\u5357\u6865\u82af\u7247\u4e3b\u8981\u7528\u6765\u4e0eI/O\u8bbe\u5907\u53caISA\u8bbe\u5907\u76f8\u8fde\uff0c\u5e76\u8d1f\u8d23\u7ba1\u7406\u4e2d\u65ad\u53caDMA\u901a\u9053\uff0c\u8ba9\u8bbe\u5907\u5de5\u4f5c\u5f97\u66f4\u987a\u7545\uff0c\u5176\u63d0\u4f9b\u5bf9KBC(\u952e\u76d8\u63a7\u5236\u5668)\u3001RTC(\u5b9e\u65f6\u65f6\u949f\u63a7\u5236\u5668)\u3001USB(\u901a\u7528\u4e32\u884c\u603b\u7ebf)\u3001Ultra DMA/33(66)EIDE\u6570\u636e\u4f20\u8f93\u65b9\u5f0f\u548cACPI(\u9ad8\u7ea7\u80fd\u6e90\u7ba1\u7406)\u7b49\u7684\u652f\u6301\uff0c\u5728\u9760\u8fd1PCI\u69fd\u7684\u4f4d\u7f6e\u30024.CPU\u63d2\u5ea7 CPU\u63d2\u5ea7\u5c31\u662f\u4e3b\u677f\u4e0a\u5b89\u88c5\u5904\u7406\u5668\u7684\u5730\u65b9\u3002\u4e3b\u6d41\u7684CPU\u63d2\u5ea7\u4e3b\u8981\u6709Socket370\u3001Socket 478\u3001Socket 423\u548cSocket A\u51e0\u79cd\u3002\u5176\u4e2dSocket370\u652f\u6301\u7684\u662fPIII\u53ca\u65b0\u8d5b\u626c\uff0cCYRIXIII\u7b49\u5904\u7406\u5668\uff1bSocket 423\u7528\u4e8e\u65e9\u671fPentium4\u5904\u7406\u5668\uff0c\u800cSocket 478\u5219\u7528\u4e8e\u76ee\u524d\u4e3b\u6d41Pentium4\u5904\u7406\u5668\u3002 \u800cSocket A(Socket462)\u652f\u6301\u7684\u5219\u662fAMD\u7684\u6bd2\u9f99\u53ca\u901f\u9f99\u7b49\u5904\u7406\u5668\u3002\u53e6\u5916\u8fd8\u6709\u7684CPU\u63d2\u5ea7\u7c7b\u578b\u4e3a\u652f\u6301\u5954\u817e/\u5954\u817eMMX\u53caK6/K6-2\u7b49\u5904\u7406\u5668\u7684 Socket7\u63d2\u5ea7\uff1b\u652f\u6301PII\u6216PIII\u7684SLOT1\u63d2\u5ea7\u53caAMD ATHLON\u4f7f\u7528\u8fc7\u7684SLOTA\u63d2\u5ea7\u7b49\u7b49\u30025.\u5185\u5b58\u63d2\u69fd\u5185\u5b58\u63d2\u69fd\u662f\u4e3b\u677f\u4e0a\u7528\u6765\u5b89\u88c5\u5185\u5b58\u7684\u5730\u65b9\u3002\u76ee\u524d\u5e38\u89c1\u7684\u5185\u5b58\u63d2\u69fd\u4e3aSDRAM\u5185\u5b58\u3001DDR\u5185\u5b58\u63d2\u69fd\uff0c\u5176\u5b83\u7684\u8fd8\u6709\u65e9\u671f\u7684EDO\u548c\u975e\u4e3b\u6d41\u7684RDRAM\u5185\u5b58\u63d2\u69fd\u3002\u9700\u8981\u8bf4\u660e\u7684\u662f\u4e0d\u540c\u7684\u5185\u5b58\u63d2\u69fd\u5b83\u4eec\u7684\u5f15\u811a\uff0c\u7535\u538b\uff0c\u6027\u80fd\u529f\u80fd\u90fd\u662f\u4e0d\u5c3d\u76f8\u540c\u7684\uff0c\u4e0d\u540c\u7684\u5185\u5b58\u5728\u4e0d\u540c\u7684\u5185\u5b58\u63d2\u69fd\u4e0a\u4e0d\u80fd\u4e92\u6362\u4f7f\u7528\u3002\u5bf9\u4e8e168\u7ebf\u7684SDRAM\u5185\u5b58\u548c184\u7ebf\u7684DDR 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USB 2.0数据线的结构如下：
其中，两根电源线（Vcc、GND）直径较粗，而数据线则相对较细。外层的铝箔和编织网只在质量较好的USB线里面才有，用于增加线缆的强度并起到电磁屏蔽的作用，一般是与GND相连的。
USB 3.0数据线的结构如下：
USB 3.0的导线数量较多，但基本结构与USB 2.0是相同的。需要注意的是USB 3.0的数据线数量比较多，并且数据线传输的信号也是频率很高的信号，因此很多线缆加强了屏蔽（图中这个就是，可以看到有两组数据线拥有独立的屏蔽层）。
USB 结构图 http://www.szantai.com/products/usb_2.html
USB线的内部结构，不就4条线吗？还有“结构”？
绛旓細USB 2.0鏁版嵁绾跨殑缁撴瀯濡備笅锛氬叾涓紝涓ゆ牴鐢垫簮绾匡紙Vcc銆丟ND锛夌洿寰勮緝绮楋紝鑰屾暟鎹嚎鍒欑浉瀵硅緝缁嗐傚灞傜殑閾濈當鍜岀紪缁囩綉鍙湪璐ㄩ噺杈冨ソ鐨刄SB绾块噷闈㈡墠鏈夛紝鐢ㄤ簬澧炲姞绾跨紗鐨勫己搴﹀苟璧峰埌鐢电灞忚斀鐨勪綔鐢紝涓鑸槸涓嶨ND鐩歌繛鐨勩俇SB 3.0鏁版嵁绾跨殑缁撴瀯濡備笅锛歎SB 3.0鐨勫绾挎暟閲忚緝澶氾紝浣嗗熀鏈粨鏋勪笌USB 2.0鏄浉鍚岀殑銆傞渶瑕佹敞鎰...
绛旓細USB绾挎渶涓よ竟鍒嗗埆鏄5v渚涚數锛堢孩鑹诧級鍜屾帴鍦扮嚎锛堥粦鑹诧級锛屼腑闂村垎鍒槸鏁版嵁鍙戦佸拰鎺ユ敹锛屼綘鍙鎺ユ渶涓よ竟涓ゆ牴绾垮氨鍙互浜嗭紝涓嶇‘瀹氱殑璇濆彲浠ョ敤涓囩敤琛ㄤ簩鏋佺妗ｆ祴涓嬶紝涓囩敤琛ㄤ竴澶磋Е绾㈢嚎锛屽彟涓澶磋Е鎵嬫満5绾挎帴鍙ｄ换涓绾匡紝鑻ユ湁鐭帴澹板垯涓哄悓涓鏍圭嚎锛岄粦绾夸篃涓鏍枫
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