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为您的无线物联网设备供电选项
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2017-05-13
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为您的无线物联网设备供电选项
您的无线物联网设备的计划是所有设置：传感器识别，超低功耗处理器的选择，和无线连接的格式，协议，和乐队已经确定（图）。有一件事仍然存在：确保有足够的可靠的电源为这个物联网设备无人值守，并在应用程序需要的时间。物联网设备是一个权力吝啬者的设计，所以它不应该是一个问题，提供少量的权力，对不对？
Figure 1： The greatly simplified system-level block diagram of a generic IoT design shows its three “external” connections： sensor （or sensors）， DC power， and wireless port connection （antenna）。
As in most engineering decisions， the answer is not simple. There are many potential options for powering the device， depending on the specifics of the installation： nearby AC line， available DC rail， energy harvesting， or battery. The first two choices require the IoT device remain tethered; the third has more freedom but the IoT device is still constrained by the placement of the harvesting transducer; and the battery-only option offers the greatest flexibility in placement but will need replacement，
AC line： this seems like the easiest option， as it can provide as much power as needed and for as long as needed. The problem is that it will need an AC/DC converter. This AC/DC converter can be a purchased external unit （even a basic “wall wart”）; but such converters can be relatively large and costly， and many models are not designed or built for years of reliable operation. Alternatively， a small AC/DC circuit can be built onto the IoT device PC board， but this brings safety and regulatory-approval issues due to the presence of the line voltage， in addition to the cost and size burden.
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