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A voltage controller for the operation of three-phase single switch boost rectifier is proposed using low cost op-amps. The controller automatically adjusts the pulse width of the boost rectifier to maintain a constant dc load voltage of desired level, despite the variations in the load and source voltage. Methods have been proposed for calculating the duty ratio to obtain the desired dc load voltage...
This paper introduces a designer-side switching loss analysis characterized by evaluating parasitic capacitor's energy variation and related losses for integrated synchronous Buck converters in CMOS technology (ISBC). After categorizing losses related to power FET parasitic capacitors' charging/discharging currents as charging/discharging losses (C_loss), it is noticed that the ratio of charging/discharging...
In this paper digital voltage-mode controller design for a zero-voltage turn-on high gain boost converter is presented. Firstly, the converter steady-state performance is analyzed by using circuit theory principles. This analysis shown that this converter circuit exhibits five different modes of operations in one switching cycle and also results in zero-voltage transition to the switching devices...
Traditional EDM power supplies convert the energy at low frequency, directly from the utility line and they are able to deal with a wide spectrum of output power. The EDM power supply must achieve high voltage to generate the spark and large current to maintain the ion column. To achieve this, large and heavy transformers and inductances are required. Resonant converters are desirable for power conversion...
This project has been oriented to the development of an energy system unit for powering tramways during shorts periods of time. The aim of this work is to present the results obtained for a high frequency DC-DC converter which is included in the energy unit. The energy unit will consist on two type of energy storage devices: a battery stack and a supercapacitor stack. A comparison of the simulated...
The transient model of 3-phase diode bridge rectifiers is developed, and the implementation of the operation analytical equations is carried out, by means of a switching functions Park formulation. A few examples show effectiveness and usefulness of the adopted approach: at first, a 6-pulse bridge rectifier is examined; later, a 12-pulse system is studied, both with series and parallel connected bridges.
This article describes the design of an observer-based, robust, linear output feedback controller for the regulation, and output reference trajectory tracking tasks, in switched “buck” converter circuits with completely unknown, time-varying, resistive loads. The disturbance effects of the unknown load resistance are on-line estimated by means of a Generalized Proportional Integral (GPI) observer,...
Multilevel voltage-source converters (VSC) are attractive for high-voltage and high-power applications. However, the increased part counts and control complexity also complicate the converter modeling and control. One particular control problem is the balancing of dc capacitor voltages. Conventional voltage balancing control design has been based on periodic steady-state or line-cycle averaged models...
This paper presents a new methodology to design controllers for boost converters operating in a wide range of load variation. The proposed technique uses genetic algorithm to find local LQR controllers providing optimal performance in terms of overshoot and ITSE criteria. Fuzzy logic strategy is then used to combine these local controllers, yielding a strategy that guarantees good performance for...
This paper addresses the control of a Dual Active Bridge (DAB) dc/dc converter. Closed-loop control of the output voltage is achieved by a novel nonlinear technique that separates the control algorithm into a linearization stage and a linear control law. The resulting DAB is capable of bidirectional power flow, and the transformer isolation makes it suitable for a wide variety of applications. The...
It presents a cascaded H-bridge multilevel inverter employing bidirectional switches to design an effective circuit to increase the number of output voltage levels. In the proposed circuit configuration, each inverter produces five output voltage levels. Because the output terminals of both inverters are connected in series, the final output voltage becomes nine levels including a zero. Different...
This paper proposes an improved soft switched synchronous buck converter in a fixed load condition. The switching energy can be fully recovered during current commutation phase in the gate driver while the diode conduction losses in the low and high side switches can be substantially reduced by employing additional L and C resonant in the circuit. Using PSpice simulation, the optimization technique...
In many pulse width modulated DC/DC converter topologies, the controllable switches are operated in switch mode where they are required to turn the entire load current on and off during each switching cycle. Under these conditions, the switches are subjected to high switching stresses and power losses. Recently there is an increased interest in the use of quasi-resonant type DC/DC converters due to...
The analysis and control of multi-input integrated DC-DC converter is presented in this paper. The integrated converter is essentially a combination of buck and buck-boost converters. However, on account of integration only one inductor is sufficient enough for performing the power conversion. In order to have simple control strategy as well as simpler compensator design a single loop control scheme,...
In this paper analysis and digital controller design for digital voltage-mode controlled higher order boost converter (HOBC) is presented. The state-space averaging method is applied to formulate the small-signal models; valid up-to half of the switching frequency, of the converter and a loop gain is adapted to design the voltage-mode discrete compensator. Closed-loop performance of the HOBC is analyzed...
Stability analysis of the DC-DC power electronic system is analyzed in this paper using a G-parameter approach. For demonstration boost converter cascaded with the hybrid switched capacitor converter considered as an example. The boost converter is acting as the bus converter, 42 V bus, while the switched capacitor converter is the point of load converter. The two converters are provided with voltage-mode...
Dynamic voltage restorer and STATCOM are normally employed as a solution for mitigation of voltage sag and swell. This paper presents modelling and analysis of PWM switched autotransformer as a mitigating device for voltage sag and swell disturbances. The proposed system has less number of switching devices and has good compensating capability in comparison to commonly used compensators. Simulation...
Flying capacitor multilevel PWM converter with a natural voltage balance is an attractive multilevel converter choice because it requires no voltage balance control effort. Flying capacitor converter practically does not suffer from voltage balance imposed performance limitations as opposed to multiple point clamped converter. Voltage balance dynamics analytical research methods reported to date deal...
High-resistance grounding is implemented in the DC zonal electric distribution system (DCZEDS) to permit continuity of service during a ground fault. To prevent subsequent phase-to-ground faults on the other phase from causing a disruptive phase-to-phase fault, it is of great importance that fast and robust ground fault location methods be applied to the DCZEDS. Current fault locating techniques have...
This work applies LMI control to a nonlinear switched mode power converter. The linearized model of the converter presents a non-minimum phase response. Nonlinearities and uncertainty are taken into account using a polytopic model. The LMI formulation permits to build a state-feedback controller to stabilize the plant with the maximum perturbation rejection and a certain pole placement constraint...
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