安全性必须要与应用保持一致，其方案由手头可利用的资源所决定。当一个灯泡既没有键盘也没有显示器的时候，要给它输入16位密码是非常困难的。而如果一个方案太昂贵，太难安装，或者太耗时，消费者是不会用它的。
ZigBee技术由一些全球最为成功的公司所创建，所有这些公司都会关注最新的安全方案。ZigBee联盟成员的技术工作组一直在积极审查ZigBee安全框架，寻求业界最佳方法，来保持走在不断演变的威胁之前，因此我们欢迎这种开放标准团队的分析。
The ZigBee Alliance and its members take security very seriously. Our members develop standards and protocols to strike the appropriate balance between ease of use and secure interaction of devices to afford the greatest ‘smart’ functionality with the least exposure.
We are aware of the report promoted from Black Hat， The risk described is small regarding a singular point in the initial， out-of-the-box joining （when the homeowner is installing a new device） or when a device is re-joining the network after losing contact with its parent – which is a few milliseconds of key exchange. The hack requires substantial knowledge and equipment and is unlikely to occur outside of the security community.
Security has to fit the application， and schemes are dictated by the resources at hand. It is very hard to enter a 16-digit passphrase into a light bulb when there is no keyboard or monitor. If a scheme is too expensive， too difficult to install， or too time-consuming – consumers won’t apply it.
ZigBee technology is created and implemented by some of the most successful companies in the world， all of which have access to the latest security schemes. Members of ZigBee Alliance technical working groups actively review the ZigBee security framework as well as industry best practices to stay ahead of evolving threats， and therefore welcome this type of analysis as an open standards community.扁平线圈电感制造厂
功率电感：如何让电源为电池快速充电提供最大输出 低电池电压表明电池深度放电。因此电池必须先以小电流充电，直至电池电压达到阀值 VPRECHG。这个阶段称为预充电阶段。 一旦电池电压增大到某个阀值 （VPRECHG），就可以用前面介绍的最大电流充电
是什么因素影响了开关电源模块的工作效率在能量转换系统，必然是会产生损耗，所以在实际应用中，开关电源模块工作效率只能尽可能接近百分百。 因为取决于元件自身，所以只能通过元件技术来改进。 下面分析下影响开关电源模块效率的主要因素有哪些。 开关电源模块的损耗主要来自开关元件MOSFET和二极管，另一部分来自电容和电感。 MOSFET和二极管由于自身特性，会大大降低系统效率，可分成传导损耗和开关损耗俩部分。 简单来说，任何电流回路都存在损耗电阻，会造成能量损耗。 MOSFET和二极管
使用可编程直流电源有哪些要注意的呢？什么是可编程直流电源呢？可编程直流电源就是用通过电路控制开关管进行高速的导通与截止，将直流电转化为高频率的交流电提供给变压器进行变压，从而产生所需要的一组或多组电压。 那么使用可编程直流电源应该注意些什么呢？1、电感性负载应用当开关可编程直流电源供应器时或者改变输出电压时，电感性负载会产生反方向感应电动势影响可编程直流电源供应器的工作，甚至会导致可编程直流电源供应器的损坏，此时，在可编程直流电源供应器的输出端与负载