Implementation Strategies for USB Circuit Protection Technology

ADRIAN MIKOLAJCZAK

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Implementation Strategies for USB Circuit Protection Technology

机译：USB电路保护技术的实施策略

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The USB specification requires current limiting and power switching for USB power management. The specification references resettable polymeric positive-temperature-coefficient (PPTC) devices and solid-state switches as acceptable methods of overcurrent protection. Like fuses, PPTC devices help protect circuitry from overcurrent damage. Unlike fuses, however, PPTC devices reset when the circuit is de-energized and the fault is removed. In addition to their resettability, the critical design advantages of these de- vices in USB applications are low resistance, fast time-to-trip, low tripped power dissipation, and inherent resistance to nuisance tripping. They also help provide a lower-cost solution than silicon equivalents.

机译：USB规范要求电流限制和电源切换以用于USB电源管理。该规范将可复位的聚合物正温度系数（PPTC）器件和固态开关作为可接受的过电流保护方法。像保险丝一样，PPTC器件有助于保护电路免受过电流损坏。但是，与保险丝不同，PPTC设备在电路断电且故障消除后会复位。除了可重置性之外，这些器件在USB应用中的关键设计优势还包括低电阻，快速跳闸时间，低跳闸功耗以及固有的抗扰动跳闸能力。与硅等效产品相比，它们还有助于提供成本更低的解决方案。

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来源
《Compliance Engineering》 |2003年第3期|p.84-88|共5页
作者
ADRIAN MIKOLAJCZAK;
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作者单位

Tyco Electronics Power Components, Raychem Circuit Protection Div. (Menlo Park, CA);

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原文格式 PDF
正文语种 eng
中图分类电工技术;
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Implementation Strategies for USB Circuit Protection Technology

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