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This paper reports a novel method for passive DC current sensing without using a cord separator. In this method, a piezoelectric thin-film cantilever with a micro-magnet on its end is positioned near a power cord. The DC current in the power cord induces a magnetic field, which generates a magnetic force acting on the micro-magnet. Consequently, the piezoelectric cantilever is bent and induces an...
This paper analyzes effects of design parameters on the read margin of an ReRAM crossbar array. Because ReRAM's crossbar array suffers from small read margin, design parameters must be optimized for large read margin. In this paper, by simulating ReRAM crossbar arrays with various design parameters, we analyze the relations between the read margin and the design parameters: 1) the line resistor, 2)...
This paper presents the improvement of a low cost saliency-based sensorless drive with a single dc-link current sensor for interior permanent-magnet synchronous machines. The phase currents, reconstructed by the single dc-link current sensor, usually suffer from a significant reconstruction error. This paper analyzes this reconstruction error, especially when applying sensorless drive technique based...
The article suggests an architecture of the analog signals multiplexer (AM), realized on the base of multichannel differential difference op amp (DDA) with N (N=2, 3…) input deferential stages (DSs). Each of DSs is transferred to the working conditions or to the current saving mode by the digital signal from the corresponding RS-trigger. The state pre-setting of AM RS-triggers determines the main...
Energy is one of the most precious resource in Wireless Sensor Networks (WSNs) which is mainly consumed in communication, sensing and processing. Performance evaluation of WSN routing protocols primarily rely on simulation-based studies. Most of these studies only assume oversimplified First Order Radio Model (FORM) and ignore node's energy consumed in sensing and processing. This paper presents an...
This paper describes the concept of the dynamic duty-cycle limiter of the boost dc-dc converter. Duty-cycle limitation in boost converters is usually used to protect the bottom switch against an excessive current, and also to avoid instability occurring at high duty-cycle operations. Compared to fixed limitation, dynamic limiter enables to detect and maintain maximal possible output voltage VMAX,...
Protection coordination represents one of the main challenges in the developing process of reliable and efficient DC systems. In the current research, a new protection coordination scheme based on fault matrix concept was developed. A testbed was established at Institute of High Voltage Engineering and Electrical Power Systems (elenia) laboratory, Braunschweig University of Technology to verify the...
A three phase Vienna/Modular-Boost rectifier provides only boost voltage gain regulation using three single phase PFC controller to achieve power factor correction and input current waveform improvement. A Buck-Boost voltage gain regulated two switch three phase Ćuk AC-DC converter is considered in this paper with only output voltage feedback control. The proposed circuit has fewer active and passive...
In this work, the total spectrum sensing duration required for cognitive radios in multiband environments is studied to minimize the reactive handoff latency. Two spectrum sensing strategies, namely window-based and sample-based sensing, are evaluated to estimate channel workload and idle time probability. Channel workload is the percentage of time the band is used by other wireless networks. Idle...
As a result of dead-time, device on-state voltage drop, DC bus voltage error and fluctuation, etc., Volt-sec. errors degrade precise control of torque and flux linkage, particularly at low speeds. This is true for deadbeat-direct torque and flux control (DB-DTFC) which directly manipulates the Volt-sec. vector sourced by inverters as well as for indirect field oriented control (IFOC) drives. This...
Primary-side regulation (PSR) scheme is widely used in low-cost and low power applications such as cell phone charger and LED lighting. Generally, an auxiliary winding in the conventional flyback converter is used for both power supplier and feedback sensing. With the increase of labor cost, the transformer needs to be produced automatically. So the transformer architecture should be designed as simple...
Cascaded boundary-deadbeat controller has been proven to be effective in controlling single-phase grid-connected inverter with LCL output filter. Such architecture mitigates filter resonance and offers good stability under stiff and weak grid conditions. However, its merits are offset by requiring many sensors and high-precision intra-cycle information of the circuit variables to dictate the states...
This paper presents a H-bridge building block with 1700V SiC MOSFET for a pulsed power application to achieve both high voltage, high current and high switching frequency capability. Both power module level and system level stray inductance is minimized to better utilize the SiC high switching speed capability. Meanwhile, since the large pulsed energy is required to drive the pulsed load, voltage...
The virtually-grounded grid-connected voltage-source three-phase inverter has been proven to be more effective in alleviating the common-mode noise than the one without the virtual ground and in extending the utilization of DC bus voltage, as compared to the four-wire configuration. However, similar to the four-wire configuration, such virtually-grounded configuration would have DC bus unbalance,...
A novel data source selection algorithm is proposed for ambulatory activity tracking of elderly people. The algorithm introduces the concept of dynamic switching between the data collection modules (a smartwatch and a smartphone) to improve accuracy and battery life using contextual information. We show that by making offloading decisions as a function of activity, the proposed algorithm improves...
In this article, the most essential aims on information protection of data processing centers in more flexible way to provide the necessary level of security of the existing environment of development and dissemination of cyber-attacks, which should be easily scaled to support any of its changes in the future, also in this paper Formation of competitive information security of data processing center...
In this paper, we have exploited the novel hybrid-cum-improved spectrum access strategy to significant improvement in the throughput and data-loss rate. This proposed strategy is comprise of hybrid spectrum access and improved frame structure strategies for the cognitive radio communication system. In addition to this, the mathematical expressions of throughput for these approaches are also presented...
Generally falls may occur from moving or resting postures. This may include slipping from bed and fall from a sitting, or from running or walking. The pre-fall is a non-equilibrium state of human position that may lead to serious injuries, and may negatively impact the quality life condition, particularly for elders. Physical disabilities resulting from the fall incidences may lead to high costs involved...
We introduce an action selection framework for the advanced behavioural animation of virtual creatures. In modern creative media, the behavioural animation of characters which act in a believable fashion is an ongoing challenge. Traditional action selection approaches which attempt to make an agent act rationally often fall short of the believability required for the modern consumer. Often the most...
Although microsystems today require less power than ever before, they still cannot fit large enough batteries to sustain them for months or years at a time. Ambient energy is appealing, but only when available, which is often not the case for embedded sensors. Transmitting power wirelessly is more practical in these applications. Tiny receivers, however, capture a small fraction of the power that...
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