Abstract
In order to realize a true WoT environment, a reliable power circuit is required to ensure interconnections among a range of WoT devices. This paper presents research on sensors and their effects on the reliability and response characteristics of power circuits in WoT devices. The presented research can be used in various power circuit applications, such as energy harvesting interfaces, photovoltaic systems, and battery management systems for the WoT devices. As power circuits rely on the feedback from voltage/current sensors, the system performance is likely to be affected by the sensor failure rates, sensor dynamic characteristics, and their interface circuits. This study investigated how the operational availability of the power circuits is affected by the sensor failure rates by performing a quantitative reliability analysis. In the analysis process, this paper also includes the effects of various reconstruction and estimation techniques used in power processing circuits (e.g., energy harvesting circuits and photovoltaic systems). This paper also reports how the transient control performance of power circuits is affected by sensor interface circuits. With the frequency domain stability analysis and circuit simulation, it was verified that the interface circuit dynamics may affect the transient response characteristics of power circuits. The verification results in this paper showed that the reliability and control performance of the power circuits can be affected by the sensor types, fault tolerant approaches against sensor failures, and the response characteristics of the sensor interfaces. The analysis results were also verified by experiments using a power circuit prototype.
Highlights
The use of advanced power processing circuit technologies has increased continuously for numerous applications such as wireless sensor networks [1,2], IoT devices [3,4], and home appliances [5]
As a power circuit control methoda power circuit control method generally requires the installation of sensors, this and paper reports the generally requires the installation of sensors, this paper reports the effects of sensors their interface effects of sensors and their interface circuits on the performance of power circuits
This study examined how the reliability and transient response characteristics of power circuits study how the reliability and and transient response characteristics power circuits usedThis in the WoTexamined devices are affected by sensors interface circuits
Summary
The use of advanced power processing circuit technologies has increased continuously for numerous applications such as wireless sensor networks [1,2], IoT devices [3,4], and home appliances [5]. The power circuits inside such devices perform energy harvesting and power processing so that the devices are operational and connected to the WoT. The processors and transmitters of such WoT devices can successfully function using the energy that is harvested and processed by the power circuits. Since power circuits and different types of power sources are commonly used in the WoT devices [7,8], their design engineers should not overlook the effect of power circuits (e.g., energy harvesting interfaces) on system performance factors such as reliability [9], cost [10], and efficiency [11]. To enable the effective and efficient operation of different power sources, the system designers should consider the reliable circuit control strategies and power management algorithms for power circuits used in WoT devices
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