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This paper examines the problem of generating testing actions for electronic industry test systems designed for verification of electronic packages of UHF band. This paper shows complex problems of setting amplitude and time parameters of multichannel generators of test signals. The problems of multichannel wide range signal generation and frequency control, rise and fall time control, pulse time...
In this paper, we aim to investigate the output group consensus problem for a switching network of heterogeneous linear systems such that outputs of the agents synchronize with each other in every cluster. From the internal model principle perspective, a necessary condition is first derived in terms of the system dynamics. With this necessary condition, a dynamic controller is then designed to solve...
The installed power capacity of grid-connected photovoltaic (PV) systems has increased exponentially around the world. The size of each unit is also increasing as they are becoming more affordable. The grid is a highly non-linear system. Hence, the grid disturbances affect the output of the solar PV systems. This paper presents a study of the effects of grid disturbances such as switching of loads,...
The development of high power pulse engineering is associated with the necessity to solve a set of problems, among which are the methods of storing the energy and its transfer to load. The search of optimal technical solutions at the stored energy of ∼107 J and over leads to an obvious conclusion which is in the favor of using inductive storages (IS) since they have a greater potential in view of...
Synchronized cutting-in control strategy and power control strategy after gird-connection of doubly-fed wind power generator is analyzed in detail. Since two different generator control systems are employed between cutting-in moment, a smooth switching strategy is presented, too. Simulating results are shown that the synchronized cutting-in control strategy adopted can meet grid connecting requirement,...
The following article provides a description of an application of the pseudo random signals generators, based on dynamic linear feedback shift registers, used in the DSSS spread spectrum communication. Due the changes of generator's feedback loop in time, the length of pseudo random sequence is much longer. An implementation of the dynamic linear feedback shift register generator (DLFSR) in VHDL language...
Electrical power system comprising transmission, sub-transmission and distribution networks is one of the critical infrastructures for any country. Blackouts are events that put the electrical power system into a state of severe crisis in no time and the restoration of normalcy post the event is a challenging task. All efforts are made by power system operators worldwide to avoid a scenario that may...
Automatic synchronized grid-connected requires that voltage difference, frequency difference and phase angle difference between power network and generator are all in the permitted scope, so the generator can connect to the power network smoothly. This paper bases on voltage difference, frequency difference and phase angle difference to deduce the impulse current when the contactor closes, and researches...
The multi-input converters are synthesized from two or more single input converters in order to obtain a compact structure with one output filter and one control system. The proposed configurations are obtained mixing buck hybrid DC-DC converters and classical buck structure. Preliminary theoretical analyses, validated by digital simulations, come to support the proposed converters.
In this paper, the authors present an event-driven system with resources to run applications with different degrees of complexity in an energy-aware way. The architecture uses effective system partitioning to enable duty cycling, SIMD instructions, power gating, voltage scaling, multiclock domains, multivoltage domains, and extensive clock gating. The system has sufficient computational power to run...
An all-digital de-skew clock generator for arbitrary wide range delay is proposed to minimize the instability of the clock settling while achieving fast locking time. The clock skew problem is detrimental in high-speed applications, especially when the skew is longer than multi-cycles. The proposed clock generator was fabricated in a 0.18-μm CMOS technology. The clock generator achieves a measured...
This paper presents the emulation of grid-connected wind energy conversion system based on the 30 MIPS Digital Signal controller (DSC) dsPIC30f3011. This system is composed by a three-phase permanent magnet generator, an AC to DC converter and a single phase Voltage Source Inverter (VSI). The inverter was driven using Space Vector Pulse Width Modulation (SVPWM) at a switching frequency of 18 kHz and...
Inheriting all attributes of traditional synchronization system, this one designed has more functions, such as friendly MMI, facile expansibility and high reliability. Double CPU are applied in the designed synchronization which enhance the security and stability. And the approach of least square is adopted to forecast the synchronization time which can not only calculate exactly the leading time,...
Low power design is becoming the mainstream in VLSI. However, since most of the technologies minimizing power consumption have only focused on normal mode operation, test mode operation is often posing the high power consumption because of the high switching activity during scan shift operation. On the other hand, test data volume has become big issue as the size of digital designs continues to grow...
Class D amplifiers are becoming the most feasible solution for embedded audio application. However, distortions due to the non-linear nature of switching stage are the main drawback for this amplifier topology. This paper discusses the design and implementation of high fidelity audio class D using sliding mode control scheme. This design method proves to be a cost effective solution for industrial...
We propose QUEST (QUality ESTimation), a new method that accurately estimates IEEE 802.11 wireless link quality with no in-band signaling overhead. Existing link quality estimation methods either are based on hello exchanges by fixing or varying transmission rates or rely on the history (e.g., delivery ratio) of previously sent data packets in a per-rate/-neighbor manner. QUEST on the other hand,...
A fully power aware globally asynchronous locally synchronous network-on-chip circuit is presented in this paper. The circuit is arranged around an asynchronous network-on-chip providing a 17 Gbits/s throughput and automatically reducing its power consumption by activity detection. Both dynamic and static power consumptions are globally reduced using adaptive design techniques applied locally for...
We designed and built a novel all-optical re-timing, re-amplifying, and re-shaping (3R) regeneration system based on terahertz optical asymmetric demultiplexers (TOADs) developed in our laboratory. The system is capable of parallel processing multiple wavelengths, a feature which will significantly improve the scalability of current wavelength division multiplexing (WDM) networks. Performance against...
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