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A novel quasi-Z-source dc-dc converter is proposed in this paper. Compared with the conventional Z-source dc-dc converter, the proposed converter features high voltage gain with lower voltage stress of the impedance network capacitors and has common ground for input and output. Moreover, both the input source current and output load current of the proposed converter are continuous, which provides...
The short circuit problem is a difficult issue in LLC converter. This paper derives the state-plane trajectory of the full-bridge LLC converter based on state-plane analysis and the characteristics of the trajectory performance are provided under short circuit mode. Two types of control scheme for power switches, respectively based on phase-shift frequency-boost and frequency-drop method, are deduced...
An isolated inverter based on differential output is proposed. The inverter is composed by two phase-shifted full bridges (PSFB) converters. The two PSFBs share a common leg which works as the lagging one on the primary side. Two current-doubler synchronous rectifiers (CDR) are on the secondary side and constitute differential structure. With the same DC bias and phase-reversed AC components in the...
A TCAD model for Chalcogenide based CBRAM is presented. This model starts from an existing model and uses an advanced level set method to follow the growth of the filament in the electrolyte. We couple the level set method with equations which model the cations migration and the electric field in the electrolyte and in the filament. We take into account silver clusters in the electrolyte in order...
The main objective of this paper is to propose a new state-space modeling approach for AC-DC single-stage power factor correction (PFC) buck-boost converters by using a modified version of conventional state-space modeling approach. In the paper, the operation of a singlestage PFC buck-boost converter is briefly reviewed and the proposed modeling approach is introduced and explained in detail. It...
This paper proposes a design close loop for series resonant converter based on generalized state space averaging modeling for the resonant converter. In addition, this study covers both the steady state analysis and small signal modeling for the series resonant converter, working under zero voltage switching conditions. The proposed closed loop system, which uses PID controller and the Observable...
As the limitations of energy consumption for real-time embedded systems more strict, it has been difficult to ignore the context switch overhead for Fixed-Priority task with Preemption scheduling (FPP) in multitasking environment. This paper presents a Reducing Context Switches scheduling (RCSS) based on preemption thresholds scheduling for real-time embedded system to decrease system energy consumption...
Novel step-up DC/DC converter is introduced in this paper. This converter is realized with adding the switched capacitor voltage multiplier cell to the three switch step-down DC/DC converter that has been proposed in the literature. The proposed converter is analyzed in the steady state and the voltage transfer gain is obtained. It is also demonstrated that the voltage stress on all semiconductor...
The purpose of this paper is to present a new integral coefficient change method that is not required the load current detection. The integral coefficient is changed based on the on-time of main switch. It uses two kinds of hysteresis function for stable operation around the boundary point of continuous conduction mode and discontinuous conduction mode. One uses the shape of rectangular And another...
Next generation cellular architectural hierarchy imposes that a pre-fixed group of Node Bs be connected to a Radio Network Controller (RNC) and a pre-designed set of such RNCs be then assigned to a Serving GPRS support Node (SGSN). In addition to that, the set of RNCs is also wired to one Mobile Switching Center (MSC). In case of a single-homed network, the operating cost, comprises the cabling or...
The purpose of this paper is to presents a new integral gain switchover method that has the unique hysteresis function in which the current sensor circuit is not required. In this paper, two kind of integral gain switchover method is indicated. One is te two-step switchover method having the rectangle hysteresis function. The other is slope switchover method having rectangular triangle hysteresis...
In this paper, LLC series resonant converter with current-doubler as a rectification circuit for secondary side is proposed. The current-doubler circuit is generally used for the high voltage input and low voltage output application to get high efficiency characteristics with reduced transformer turn ratio. However, an inductive circuit is not used in a secondary side for the LLC series resonant converter...
In this article a new, predictive control method of the AC/DC converter is presented. The method is based on the Direct Power Control algorithm and current error vector minimization criteria. Key assumptions of the predictive DPC-3V algorithms are presented. The correctness of the analysis has been confirmed by laboratory results.
This paper presents the design of Memristor-capacitor based startup circuit. Memristor is a novel device and has many advantages over conventional CMOS devices such as no leakage current and is easy to manufacture. In this work the switching characteristics of memristor is utilized. First the theoretical equations describing the switching behavior of memristor are derived. To prove the switching capabilities...
The goal of this paper is to do a harmonic analysis for the output voltages, output currents, input-source currents, and pulsating-dc link voltage of an Isolated-Multistage High-Frequency-Link (HFL) inverter. A comparison between the frequency-spectrum for these variables plotted using the derived equations.
In this study, a novel interleaved CLL resonant converter with a full bridge rectifier is analyzed. Series connected transformers in the secondary side provide to share the power in each port and reduce the voltage stresses on the switches compared to the parallel connected transformers. The presented converter topology is explored for wide input and output voltage variation without frequency changes...
In order to drive the electric machines using the motors efficiently, the energy loss should be minimized during its operation. The optimal torque and rotating speed trajectories to minimize the energy loss of the induction motor (IM) during its operation has been proposed when the operation time, rotating speed, and rotational angle are given as drive conditions. However, the optimal trajectories...
Dead-times and switch voltage drops represent the most important sources of distortion of the (average) output voltage in PWM inverters. Their effect is a function of the parameters of the drive system and of the operating conditions, and is often intolerable in many drives applications, thus requiring a proper compensation strategy. Many techniques are implemented in industrial drives and reported...
This paper presents an SVPWM-based division-summation (D-E) digital control for a three-phase grid-connected inverter with wide inductance variation. The proposed D-E approach summarizes all of the individual inductor-current variations over one switching cycle to derive control laws directly, which can overcome the limitation of d-q transformation. The inverter with this control can achieve the functions...
Model Predictive Control (MPC) offers many advantages over more traditional control techniques, such as the ability to avoid cascaded control loops. Unfortunately, as a result of the lack of presence of a modulation strategy, this approach produces spread spectrum harmonics which are difficult to filter effectively. Furthermore, high switching frequencies may be needed because of the limited number...
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