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Digital low-dropout regulators (DLDOs) draw great attention because of their low voltage operation and process scalability. Several works done to improve the stability and transient performance of DLDOs are based on using a clock-based comparator as an error amplifier. This paper aims to propose the use of sliding-mode control (SMC), as the controller of DLDO instead of the conventional clock-based...
The controlled switch became a technical solution for reducing the switching stress. The controlled switching can be applied to any type of commutations. There are now dedicated controllers which are used more often for the switching of the transport and distribution lines, of the small inductive loads, of the capacitors batteries, or for energizing the no load power transformers. The paper deals...
Teaching electrical engineering with the help of simulation packages is very essential nowadays to explain/examine the circuit topologies and operation. The paper focuses on the power factor compensation in the three-phase electric circuits. The three-phase electric network, working on a known nominal power, will be simulated using OrCAD, a programme for electric circuit modeling and simulation.
This paper proposed an improved dual-edge modulation (IDM) for digital average voltage (DAV) controlled switching converters. The DAV control can regulate the output voltage of switching converter without a PI compensator. Different from the conventional symmetrical dual-edge modulation (SDM) method, the IDM has double sampling points in one switching cycle, which ameliorates the transient performance...
During the start of a powerful induction motor drive reactor the switchover time to the net is the only controlled parameter. At switchover to the net in the end of the starting condition heat losses in the motor increase whereas during early switchovers significant impact electromagnetic torques can occur. Justified choice of the switchover time requires a detailed analysis of electromagnetic processes...
In this paper, Enumeration-Based mode predictive control (EMPC) approach is applied to Buck dc-dc converter. First of all, the continuous state space model and the discrete-time state space model of the converter are derived. Secondly, the strategy of Enumeration-based predictive control for continuous current mode (CCM) and discontinuous current mode (DCM) of buck converter is presented in detail...
DC microgrids (MGs) have many potential advantages compared with AC microgrids, which have attracted more and more attention in recent years. However, DC bus voltage control of these systems can be an important issue undergoing the power surplus or deficit. An energy buffer in the DC MG powered by the bidirectional DC/DC converter with energy storage systems (ESS) such as super capacitor were investigated...
This paper presents a switched formulation of the suboptimal second-order integral sliding mode control law that has recently appeared in the literature. The integral approach maintains the good properties of the Suboptimal Second Order Sliding Mode (SSOSM) algorithm in terms of chattering alleviation, but, in addition avoids the reaching phase and keeps the controlled system trajectory on the sliding...
The recently introduced Split-Path Nonlinear Integrator (SPANI) is designed to improve the transient performance of linear (motion) systems in terms of overshoot. The SPANI was shown to be an effective nonlinear controller to improve transient performance by enforcing the same sign in the integrator action and the error. However, to avoid (fast) switching in the control input in steady-state, conservatism...
Transmission line switching is an important operational action in power transmission systems, and has been successfully applied to reduce generation costs and eliminate congestions. Prior work mainly focus on tackling the Optimal Transmission Switching problem based on steady states. This paper studies how to generalize these results when transmission switching is performed on highly congested systems...
The change of operating conditions by circuit breaker switchings or initiation of emergency conditions (short circuits) is accompanied with transient processes. The physical nature of a transient process is redistribution of the stored energy between inductive and capacitive network elements. In some cases, circuit breaker opening may induce high-frequency overvoltages, while circuit breaker closing...
This paper presents an evaluation of power quality, experienced at UCSI University's North Wing Campus. A power quality recorder is installed at the main feeder switch board for 24/7 campus wide monitoring and recording. It is found from the recorded data that the university campus experiences up to 4 power quality abnormally monthly. There are voltage sags, interruptions, oscillatory transients and...
In this paper, we conduct a data-driven experimental analysis on capacitor bank switching event at a distribution grid in Riverside, CA using data from two distribution level phasor measurement units, a.k.a, μPMUs. Of particular interest was to detect the capacitor bank switching events based on feeder-level and load-level μPMUs and thus eliminating the need to install separate sensors for the switched...
Different types of multi-input DC-DC converters have been proposed by number of researchers for the purpose of integrating more than one energy source. Development of a suitable power electronic interface is most essential for integrating these sources with very less number of components. Nowadays, it is very much essential to stabilize the output voltage of DC/DC converters in order to ensure maximum...
Rapid sintering of nanosilver paste had been proposed to bond power chips in our previous work. It seems a potential good way to improve the efficiency of power module manufacturing because of the much shorter sintering time, i.e., 15 seconds. In this study, we tried the way of rapid sintering of nanosilver paste for bonding power chips in order to verify the feasibility of the rapid sintering method...
We are investigating countermeasure techniques against electric noise on telecommunication and related equipment. There are many types of electric noise, and we focus on the characterization of transient noise such as the switching noise of switching power supplies. We are developing a method of transient signal analysis based on linear predictive coding (LPC) for the purpose. Unfortunately, as standard...
This paper presents a test setup to characterize current collapse effects in power diodes such as GaN-based Schottky junctions. The setup principle and its main parts are described. Current/voltage transients can be recorded very shortly (2 microseconds on wafer prober) after reverse to forward switching. The related trapping effects are analyzed through temperature dependent measurements.
Intel® introduced an energy efficient SoC power delivery scheme utilizing fully-integrated high-frequency voltage regulators along the roadmap of Moore's law scaling. From 22nm process to 14nm or even 10nm, circuit blocks shrink and the embedded passives are scaled sequentially in the similar manner. A major challenge in the on-die VR design is to achieve sufficient integration and minimization of...
Switched-capacitor voltage regulators (SCVRs) are widely used in on-chip power management, due to high step-down efficiency and feasibility of integration. In this work, we present theoretical analysis and optimization methodology for flying and decoupling capacitance values for area-constrained on-chip SCVRs to achieve the highest system-level power efficiency. The proposed models for efficiency...
Applying Software Defined Network (SDN) technology to wireless network attracts much attention. Our previous study proposed several channel utilization methods based on SDN/OpenFlow-enabled multi-channel wireless mesh network (WMN). However, since control messages are transmitted with data traffic on a same channel in WMN, it inevitably affects the network capacity. Especially, the amount of control...
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