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Two types of gyrators that can be used for controlling the energy transfer between two sub networks are analyzed in this paper. The first one operates time-continuously and is implemented using a LM 13700 operational transconductance amplifier (OTA). Under PSpice simulation and experimentally gathered data the antireciprocity of this gyrator has been verified. The main advantage of this realization...
A novel solution for last generation power MOSFETs is proposed for the first time to reduce commutation losses and easy the voltage and current control during hard switching commutations. The proposed structure is easily applicable to any driver topology and it is devoted to the realization of an hard-switched PWM inverter leg based on two power mosfets. The bidirectional conduction capability of...
Recently, there has been increasing interest in the parallel operation of DC-DC converters for reasons of increasing system reliability, facilitating system maintenance, allowing for future expansion, and reducing system design cost. In order to achieve desirable characteristics when operating converter modules in parallel, this paper proposes a unified systematic approach for modeling of parallel...
This paper investigates the feasibility of using an alternator as means of harvesting energy from a stationary exercise bicycle. A switch mode converter was designed to regulate the current in the alternator rotor winding, thus regulating the power required to pedal, and consequently the power output of the bike. The complete controller design consists of this power stage, a control circuit, a startup...
In this paper forced switching control of three-level Neutral Point Clamped (NPC) ac-dc converter having rectification and regeneration capability is presented. This converter is utility friendly and maintains the dc-link voltage constant. Hysteresis current controller (HCC) is used for current control because of its simplicity, easy implementation and good dynamic performance. The comparison of a...
This paper focuses on the modeling, controller design, simulation and analysis of a two-string photovoltaic (PV) and storage system connected to grid via a centralized nine-switch three-level inverter. A circuit-based PV array model is presented for use. A boost converter is employed to enable PV to operate at its maximum power point. The storage system consists of a capacitor bank connected at the...
In this paper, the fundamental principle of bipolar process-based current-controlled PWM switching power supply is presented. The advantages of current-controlled PWM switching power supply are pointed out, and the design, operational principle, and layout of major functional units of the circuit are briefly described. The operating frequency of the circuit is up to 1MHz. The current-controlled PWM...
In this paper, the Line-Modulated Fixed Off-Time method is used as the current control strategy for a Power Factor Corrector (PFC) pre-regulator. A zero voltage switching PWM (ZVS-PWM) auxiliary circuit is configured to perform ZVS in the switches. Soft commutation of the main switch is achieved without additional current stress. A significant reduction in the total conduction loss is achieved, since...
The control proposed and analyzed in this paper is based on the peak current mode control of the output capacitor current of a Buck converter. The output capacitor current loop provides fast dynamic response to the control since it behaves as a feed-forward of the load current while the voltage loop provides accurate steady state regulation. A simulation oriented averaged model of the proposed control...
Distributed power systems are getting more attention now-a-days due to their high flexibility and reliability. In this paper, predictive current control strategy is proposed for the grid-connected four-leg inverters. This kind of converter is developed to deliver power to the unbalanced/nonlinear three-phase loads and as well to the grid. The discrete-time model of the converter and load is used to...
With the development of switch power supply and the inverter welding power machine, the traditional PFM and PWM working method have been improved. In inverter welding machine power the CIC control method has been used in laboratory, and in computer and communication switch power supply the CIC control have been used in practice.
To increase the voltage levels and reduce the harmonics feedback to the input source in high voltage high power application, this paper proposed one novel multilevel back to back AC-DC-AC converter. Firstly, the topology about this six level converter is introduced, which realize the neutral clamped points only by switches, and is attractive for its economy. The relationship between the multilevel...
In this paper, a two-stage-cascaded scheme is presented to charge two Li batteries. The first stage consists of a boost converter which is used to step up the input voltage to some value and takes voltage-mode control, whereas the second stage is comprised of two paralleled buck converters which are used to charge two Li batteries under voltage-mode control and constant current control. Above all,...
This paper presents a power flow control method for contactless power transfer systems. The proposed method is to control the magnitude of the primary track current based on the concept of energy injection and regeneration. The stored energy and resonant current is controlled to vary on the primary side. As a result, the induced current on the secondary side varies. For such a reason, the power flow...
Active NPC voltage source converters feature a higher degree of controllability than standard NPC converters due to the additional power switches which allows several different connections of the neutral point. In this paper, these switching redundancies are used to minimize and evenly distribute the energy losses. The predictive control scheme proposed is separated in two stages: The first one controls...
This paper proposes a fixed frequency modulation scheme for a three-phase PWM rectifier operating at unity power factor. It provides a constant and reduced switching frequency for all the switches of the rectifier by controlling the occurrence and duration of the zero vector states indirectly. The two legs of the converter are operated in hysteresis current tracking mode and the third leg is controlled...
Lightweight power supply systems using soft-switched high frequency dc-dc converter for rolling stock is proposed in this paper. The system consists of hard switched boost chopper, soft switched high frequency inverter, high frequency transformer and rectifier. This system features a boost chopper to control the input current and to set up a controlled DC link. And A soft switched full bridge inverter...
To benefit the parallel current balancing, a novel digital control strategy, i.e., the current following control, is put forward. A current following control based Buck DC-DC converter-group is described. The main controller collect the output voltage and the output current in the real time, based on which, the desired output current for each Buck DC-DC converter is worked out and transferred to the...
In this work, a predictive current control algorithm of an active filter built with multilevel diode clamped inverter is developed. Cycle by cycle current optimization is achieved through current prediction based on converter switching states and system parameters. The presented current control algorithm is naturally applicable to converters with an arbitrary number of levels with constant computational...
This research aims at the development of switching power supply circuits that supply electric power from distributed power sources to electronic devices. A typical switching power supply uses constant voltage control, but in addition to constant voltage control, we propose constant current control enabled by means of digital PWM (pulse width modulation) control and a bidirectional DC-DC converter...
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