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We present in this paper a high-efficiency Class-E polar power amplifier (PA) with a novel digitally-controlled output matching network (OMN). The OMN varies the load impedance seen by the PA to modulate the amplitude of the output signal. It performs the modulation while simultaneously achieving a high power-efficiency by attaining an approximate zero-voltage-switching condition at the PA, and mitigating...
this paper presents Model Predictive Control (MPC) to tie three-phase quasi Z-Source Inverter (qZSI) to the utility grid. Regularly, to control the capacitor voltage in qZSI based on MPC, the inductor current is the key factor. Here, the proposed algorithm has the features of decreasing the number of sensors where the inductor current sensor is removed to improve the cost and foot print of the control...
In this paper the new topology DC/DC Boost power converter-inverter-DC motor that allows bidirectional rotation of the motor shaft is presented. In this direction, the system mathematical model is developed considering its different operation modes. Afterwards, the model validation is performed via numerical simulations by using Matlab-Simulink.
In this paper, voltage and power flow controlled parallel DC-DC boost converter is presented. Generally, a parallel converter system consists of a number of converters operating in parallel. The converters may be of DC-to-DC and DC-AC type depending on the nature (i.e. DC and/or AC) of the system. In this paper, the system considered is of DC type and the converters considered are two boost converters,...
Cascaded multilevel inverters are widely used in various fields, from oil and gas, power supply installations, to power quality devices. While there are many advantages of the cascaded multilevel inverter such as low voltage stress for each switching device and higher power quality, the main downside for this type of inverter is relatively large number of switching device it needs in an installation...
This paper describes the frequency analysis method of the conducted noise in AC/DC converter using SiC-MOSFET on the basis of the leakage current by switching. The error of the experimental and simulation result of the disturbance voltage is 10 dBμV. The simulation result can be closely simulated including resonance points. Furthermore, this paper presented verification results of designed EMI filters...
InfiniBand is the de facto networking technology for commodity HPC clusters and has been widely deployed. However, most production large-scale InfiniBand clusters use simple routing schemes such as the destination-mod-k routing to route traffic, which may result in degraded communication performance. In this work, we investigate using the OpenFlow-style Software-Defined Networking (SDN) technology...
The feedback control system with actuator, which has different slew rates during the rise and fall of output parameter, has been analyzed. The controller for control of such a nonlinear control system is proposed. It takes into account the peculiarity of the system, which is introduced by the actuator, and allows us to achieve good control quality. The controller is developed for the control systems...
DC-DC converters have been receiving great attention for their extensive use in a myriad of applications starting with basic calculators to photovoltaic systems to sophisticated weaponry. Several control methods were developed for DCDC converters control mostly with asymptotic convergence. Synergetic control are a proven robust controllers approach and will be used here in a so called terminal scheme...
Partial update (PU) methods play a critical part in least-mean square (LMS) algorithms with an aim to reducing computational complexity. This paper presented a novel variable step-size PU procedure for LMS algorithms via the performance metric, called error difference indicator. With the aid of such an indicator, the PU procedure can determine the proper step size and works efficiently with a low-cost...
In this paper, a new single-phase multilevel inverter topology suited for distributed DC sources is proposed. The proposed inverter is comprised of a voltage-level generator connected in series to the input of the classical H-bridge. The voltage-level generator is only able to generate positive DC voltage levels at its output. The H-bridge is used to generate the negative and zero voltage levels....
In recent years, sliding mode control has become a preferred because of its convenience and robustness. And sliding mode control techniques have been commonly employed in a various applications. In this study, the Precision Modular Servo (PMS) setup produced by Feedback is used and the sliding mode controller is designed to control the real time speed of the PMS. Lyapunov stability theorem is used...
SpaceWire is a new bussing technology provided by European Space Agency. SpaceWire enhances the functions of error detection and error recovery [1]. Considering the application background, the reliability of SpaceWire network must be guaranteed. The paper develops a new hot back-up method for improving the reliability of SpaceWire network. The method uses the one of the reserved bits of time-code...
We present a simulation-based study of the impacts of channel switching overhead on the performance of multicast in multi-channel multi-radio wireless mesh networks (MCMR WMNs). We study how channel switching overhead affects the performance metrics such as packet delivery ratio, throughput, end-to-end delay, and delay jitter of a multicast session.
This paper deals with a technique to reduce glitches in digital-to-analog converters (DACs) using Gray code input. These DACs are designed using MOSFETs, and their operation with glitch reduction was confirmed with SPICE simulation. It has been believed that good topologies of Gray code input DACs do not exist, but we show here their paradox. We also show with simulation that our Gray code input DACs...
This paper presents our study on the soft-switching converters with voltage-mode. The switching converters are well-known to obtain high efficiency, but their resonant voltages of the voltage-mode converters go very high. We propose here a soft-switching converter with the clamp circuit in order to reduce the peak voltages. We have investigated the difference of the characteristics with/without the...
In order to make the buck converter obtain smaller voltage ripple and higher efficiency at the same time, the pulse skipping width modulation (PSWM) mode in buck converter application is proposed in this paper. This novel controlling mode combines the advantage of pulse skipping modulation (PSM) with improving voltage ripple especially in lighter load and pulse width modulation (PWM) having higher...
NoC router provides efficient routing operation in the SoC board. It produces more delay to find the priority, which comes from various input channels and more area is consumed in unidirectional router. Also if any path failure occurs, it cannot route the data through other output channel. To address this problem, a novel bidirectional NoC router with and without contention is proposed, which offers...
To efficiently implement the technology validation and test of power electronic devices, a new test method is presented, APF controller closed-loop simulation based on RTDS. Simulate those primary circuits by software in RTDS, such as three-phase grid, load and APF inverter bridge, DC side capacitor and circuit breaker. The APF control and protection part are done through the control panel in real...
Conventional model based predictive control for cascade H-bridge multilevel STATCOM produces a different switching pattern for different cells. As a consequence, stresses, DC-link imbalance and active power losses are generated among the cells. To solve the aforementioned issues, this paper proposes to include a switcher of redundant vectors on the conventional model based predictive method. Additionally,...
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