為您的無線物聯網設備供電選項

2453872 2017-05-13 | rar | 0.39 MB | 次下載 | 免費

資料介紹

為您的無線物聯網設備供電選項

　　您的無線物聯網設備的計劃是所有設置：傳感器識別，超低功耗處理器的選擇，和無線連接的格式，協議，和樂隊已經確定（圖）。有一件事仍然存在：確保有足夠的可靠的電源為這個物聯網設備無人值守，并在應用程序需要的時間。物聯網設備是一個權力吝嗇者的設計，所以它不應該是一個問題，提供少量的權力，對不對？

　　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.