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This paper presents the analysis of a bidirectional series resonant converter (SRC) for light loads working in a discontinuous mode. By using the discontinuous mode, the converter's efficiency is increased because zero current switching is possible at both the turn-on and turn-off process. However, an anomalous step-up behavior was found when the converter is attached to light loads. A comprehensive...
An improved large-signal model for intrinsically tunable and switchable ferroelectric FBARs is presented. Ferroelectric FBARs based on multifunctional materials such as BST possess electric-field-tunable permittivity and electric-field-induced piezoelectricity. These properties are promising for the design of a new class of high-power reconfigurable RF devices for frequency-agile radios. Availability...
The memcapacitor has the potential to be the most useful new component of recent years due to its functional and dynamic similarities to the memristor but with much lower power requirements. Although research interest is growing, there are very few memcapacitor based circuits. Here a memcapacitor based chaotic circuit is described with a novel method to emulate a charge controlled memcapacitor.
The search for new energy sources has lead to the installation of renewable energy plants located far away from the centers of consumption. In this scenario, the transmission of electrical energy over long distances has become a key issue and high voltage DC (HVDC) transmission systems have demonstrated to be the best cost effective solution. Among the different HVDC technologies, modular multilevel...
Fractional calculus is used for theoretical description of a nondestructive diagnosis method for quality assessment of electric insulation in capacitors, transformers and other devices. The new analytical approach is based on deviation of the relaxation law from the exponential (Debye) one clearly observed in experiments on the long-time relaxation. Power modes of relaxation depends on charging prehistory...
Time dependent hereditary properties of complex materials are well described by power-laws with real order exponent. This experimental observation and analogous electrical experiments, yield a description of these properties by using fractional-order operators. In this paper, elasto-viscous and visco-elastic behaviors of fractional order hereditary materials are firstly described by using fractional...
A novel induction heating power supply topology using multilevel neutral point clamped inverter (MNPCI) is introduced and investigated in this paper. The proposed converter topology decreases the switching losses by lowering the DC link voltage to half its value with the operation under soft switching mode condition. Depending on the modified LLC optimum design being introduced, it shares the advantage...
This papers presents a complete study of the boundary conduction mode (BCM) for a dual input hybrid buck DC-DC converter (HBLC). It includes the operating principles and the analytic expressions for the key currents and voltages. A numerical method is used for solving the BCM equations in order to find the proper values of the converter inductances, as a function of the working conditions. Digital...
In conventional inverters, implementation of a transformer greatly enhances the Total Harmonic Distortion (THD) which is counted to have a negative impact on the inverter output. In order to overcome this limitation, transformer can be replaced by buck and boost converters thereby making a transformer-less inverter which will greatly reduce the THD and enhance the efficiency. In this paper, the design...
This paper presents a control technique for smoothing voltage oscillations in the sub-modules of Modular Multilevel Converter during start-up operations of high-power medium-voltage induction motor drive. At steady-state, the power fluctuations in each sub-module at fundamental and 2nd harmonic frequencies generate capacitor voltage oscillations which are much higher as the current frequency decreases...
This article proposes a robust controller design of hydro-thermal power system considering of the thermal power plant area connected to the hydro power plant area. The automation generation control of an interconnected hydro-thermal power system with a small Energy Capacitor System (ECS) augmented to both area has been investigated. The controller is used in order to control the frequency robustly...
This study presents a new topology for alternative power sources, namely interleaved boost converter with current ripple reduction (IBC-CRR), which discards electrolytic capacitors to enlarge the life-span of the converter by using current ripple reduction (CRR) technique. The voltage spikes on switches are eliminated resulting of using of low on-resistance (RDS(ON)) MOSFETs to improve efficiency...
This paper presents a novel single-phase inverter with a buck-boost-type power decoupling function suitable for PV generation. The proposed buck-boost-type power decoupling circuit enables the reduction of the peak voltage at the DC bus of the PWM inverter. This enables the use of switching devices with lower voltage ratings, and the resultant switching loss and conduction loss of the PWM inverter...
In order to solve the problem that there is coupling among neutral current and three phase current in the model of three-level PWM rectifier, this thesis has introduced the idea of coordinate transformation to transform the model from three-phase stationary coordinate system to two-phase rotating coordinate system, which reduces the order of the system to four- order linear compact model, according...
A new Microelectromechanical systems (MEMS) based capacitive differential pressure sensor is introduced. The capacitive differential pressure sensors have good sensitivity and robust structure while are not so much sensitive to the stress and other ambient conditions and typically have no temperature drift. Meanwhile, they respond nonlinearly to the input pressure variations and their sensitivity...
In this paper, the fundamentals and operation principles of the MEMS AC voltage reference is discussed and its model parameters are introduced. The accuracy of the manufacturing parameters of tunable MEMS capacitor as the main element of the MEMS AC voltage reference is of great significance to obtain a precise output voltage. Although many efforts are made to manufacture the MEMS tunable capacitors...
Ripple-based adaptive constant on-time (RBACOT) control with virtual ripple are conceptually simple, fast dynamic transient responses at lower duty cycle application, and lower component count. This control schema solves instability issue of sub-harmonic oscillation when ceramic capacitors are used. These characteristics make the regulators well-suited, especially for power management applications...
Conventional single phase DC/AC converters require a large amount of electrolytic capacitors to absorb the pulsating power on DC bus. Power decoupling technologies are very effective in reducing the capacitance and hence improve the reliability. This paper introduces three kinds of decoupling circuits, compares their filter capacitor sizing by performing detailed power flow and storage energy analysis...
This paper presents the synthesis procedure of using the signal flow graph (SFG) technique to realize general nth-order allpole voltage transfer function employing voltage differencing buffered amplifiers (VDBAs) and grounded capacitors. The proposed methodology, in general, contains at most n VDBAs and n grounded capacitors, without needing external passive resistors. It has been also show that the...
Soft-switching ac-link buck-boost converters, also known as ac-link universal power converters and partial resonant ac-link converters, have received remarkable attention during the last few years. These converters, which can be configured as dc-dc, dc-ac, ac-dc, or ac-ac (single-phase or multi-phase), are compact, reliable, and expected to offer longer lifetime compared to the other types of converters...
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