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In recent years, with the rapid development of renewable energy, power energy storage has become a bottom neck of its development, and superconducting magnetic energy storage (SMES) seems to be a viable solution. A topology based on common DC voltage bus is proposed for high power voltage source converter (VSC)-SMES. The mathematical model of SMES is constructed and the detailed control strategy is...
This paper presents a current controller and voltage balancing for a current-fed full-bridge converter, we have chosen this converter, which is an interleaved boost ‘like’ converter connected with a voltage doubler rectifier at load side via a high-frequency transformer. The advantages of this converter are: high voltage gain, low ripple input current and galvanic isolation. With the proposed controller,...
In electric vehicles abrupt torque steps and changing driving speeds require alternating currents and voltages. The battery voltage varies depending on the state of charge and on operation points. In order to keep the DC voltage of the Three-Level Inverter constant or conform it to the induced voltage of the electric machine (M) to reduce switching losses a DCDC converter is necessary. An alternative...
The main theme of this paper is to propose an online DC-link voltage control technique of LLC converter for server power applications. The proposed technique on-line controls the DC-link bus voltage of power factor corrector (PFC) to limit the switching frequency of LLC resonant converter in order to reduce the conduction loss and switching loss (turn off loss) as the switching frequency is less and...
A parallel LED string driver using capacitors for source and string ground separation is proposed. The methodology is based on connecting multiple transformers in a daisy chain and using capacitor network in every LED strings to balance the string currents. The grounds of the input source and the output strings are also separated by the capacitor network. A 21W prototype with 7 strings has been built...
Hybrid electric vehicle (HEV) technology is an effective and efficient alternative for conventional vehicles. It provides fuel efficiency, reduces harmful emission and enhances performance. The technology has gain enormous attention because of depleting conventional resources and measured carbon emission. This paper proposes a bidirectional buck boost converter with interleaved control, which minimizes...
In this paper a multisource renewable energy system simultaneously fed by photovoltaic and thermo-electric generators is proposed. The designed system provides a multi-input power converter which is properly controlled to achieve both output and input control. The output DC bus is regulated to achieve a proper supply of the output energy buffer. On each input port of the power converter a control...
Thanks to the advances in Artificial Intelligence (AI), and in particular in automated planning & scheduling and execution, goal-oriented controllers have being developed to test degrees of autonomy for robotics systems in challenging scenarios. Despite these efforts, there is a lack of methodology for approaching the design of deliberative systems or the choice of the critical parameters...
The use of battery cell equalizers is mandatory in order to assure that all the cells connected in series are charged to its maximum capacity, even when they present small differences in this parameter due to several factors, such as aging, manufacturing or temperature. Active equalizers, with a higher efficiency in comparison to passive ones, have the disadvantage of using a considerable number of...
A single-stage power converter for dc uninterruptible power supply (UPS) is proposed in this paper. Basically the proposed converter is an integration result of a power factor correction circuit with a dc-to-dc converter to achieve simple hardware circuit, high efficiency, and low cost for extra UPS function. Under normal operation, a two-switch CUK converter operates as an ac to dc converter with...
Integration of multiple DC sources has received a growing interest to enhance the powertrain performance of the BEVs. To achieve this integration, multiport DC/DC power converters (MPCs) could play a significant role in the future powertrains and sustainable energy systems. This paper proposes a bidirectional multiport DC/DC power converter (BMPC) to integrate multiple-input DC sources (such as High...
Hysteretic control is widely adopted in the power management units (PMUs) for modern electronic devices due to their simple and stable control architecture, as well as the fast load transient response. However, the switching frequency of a traditional hysteretic converter is not fixed. It changes with operating condition and component aging, and hence brings in electro-magnetic interference (EMI)...
We present normal forms for nonlinear control-affine systems that are the closest to static feedback linearizable ones, that is, for systems that become feedback linearizable via the simplest dynamic feedback, namely one-fold prolongation of a suitably chosen control. We also show that the dynamic feedback may create singularities in the control space depending on the state and we discuss them. We...
This paper presents a novel approach to control an AC/DC converter without using any current sensors. The AC/DC converter is based on the well-known boost PFC topology. Due to the particular structure of the boost PFC AC/DC converter, sensorless control of the converter is very challenging. As illustrated in this paper, the converter loses its observability for some operating points. This is the reason...
This paper presents a control method for handling a coupling effect between the liquid level and pH of the process with multi-titrated concentrations, which an outflow and titrating streams are manipulated inputs. A feedback controller formulated by using input/state (I/S) linearization and optimization technique is used to calculate control actions and estimate process disturbances. A logic of acid/base...
This paper repots an optimum on-time (OOC) control with predicting correction technique (PCT) for ripple-based buck converter. The switching frequency (FSW) variation is analyzed with completely considering the parasitic resistances of the components and devices. The proposed converter achieved nearly constant switching frequency over a wide load range without extra clock controlled circuits and current...
This paper presents a dead-time compensation strategy to control constrained nonlinear systems with single-input delay by using a dead-time free model. Prediction error and disturbance effects are analyzed in order to guarantee input-to-state stability (ISS) and robust constraint satisfaction in the presence of bounded disturbances. It is shown robust constraint satisfaction and ISS are ensured by...
A fully on-die, digitally controlled, 500MHz switching, 250mA rated output buck Voltage Regulator (VR) implemented in 22nm Tri-Gate CMOS is presented. The silicon measured a peak efficiency of 68% and consumed an area of 0.6mm2 (without output decoupling) with a power density of about 410 mW/mm2. The paper also demonstrates a controller bandwidth of 43MHz; the highest reported to date for any digital...
This paper proposes a novel digital current controller for dc-dc converters having high performance and independent of converter parameters and components values. Similar to analog controllers, the proposed digital controller uses the output voltage and the inductor current to establish the double loop control structure. The proposed controller requires only few calculations to run the control algorithm;...
In this paper, a nonlinear control algorithm for a current-fed DC-DC is presented. This converter consists of an inductor, a controllable full-bridge converter, which is connected to a full-bridge rectifier via a high-frequency transformer. The advantages of this converter include galvanic isolation, high voltage gain and low input current ripple. Based on Flatness properties, we proposed a controller,...
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