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The paper analyzes the bidirectional power exchange achieved with a multiphase DC/DC converter and the possibilities to switch this type of converter between boost and buck operation modes. In particular, the topology and the waveforms of a two-phase DC/DC bidirectional converter with coupled inductances are presented. The currents ripples for two converters sub types, with uncoupled and coupled inductances,...
Balancing/equalization plays a key role in lithium battery management systems. Dissipative techniques are commonly used to balance batteries for vehicles. The main advantages are the low complexity and the hardware simplicity. But the system has a worth efficiency, only works during the main charge process and takes a long time. Capacitive balancing structures are a special case of active balancing...
This paper explains a current sensing technique suitable for digital controller implementation. The technique uses only one analog comparator to estimate the DC as well as ripple of the inductor current of a regulated DC-DC converter. For systems where input voltage variation is anticipated, a low speed ADC can be used to take care of the variation in input voltage for inductor current estimation...
Common-mode voltage (Vcm) generated by voltage inverters is observed on motor windings. This voltage may induce bearing currents, which can eventually damage AC motors and cause larger common-mode currents. Many methods are proposed to eliminate or reduce the common-mode voltage. Most of these methods reduce the DC-bus voltage utilization and increase the output voltage harmonics. This paper introduces...
This paper proposes a high step-up, transformerless, dc/dc converter suitable for applications where high efficiency at low power throughput is required. The proposed converter achieves high step-up dc/dc conversion through a resonant LC tank and realizes high-efficiency operation via the softswitching enabled by this resonant network. Flat efficiency is obtained via discontinuous conduction mode...
This paper proposes bidirectional cascaded quasi-Z-source dc-dc converter (BC-qZSC). Compared to the traditional cascaded quasi-Z-source network (C-qZSN), the diodes in C-qZSN are replaced by active switches with a parallel diode. BC-qZSC has the higher boost ability and the lower input current ripple than those of the bidirectional quasi-Z-source dc-dc converter (B-qZSC). In this paper, the operational...
The quadratic buck converter or the BUCK converter presents a non-linear dc-dc voltage conversion ratio. The large-signal model of the quadratic buck converter would possess greater number of higher order nonlinear ac terms compared to that of the conventional buck converter. One can gain better insight by considering the linear model to understand the dynamic characteristics of these converters....
The main advantages of multilevel inverters are the improved power quality and higher efficiency. Cascaded H-Bridge (CHB) multilevel inverters are widely used in photovoltaic grid-connected generators, electric vehicles and motor drive systems. However, the CHB multilevel inverters require a large number of isolated dc power supplies, which make these inverters complicated to implement in industrial...
Three-phase four-leg neutral point clamped (NPC) inverter is more suitable in dealing with all sort of the loads especially unbalanced/nonlinear due to harmonics issues. Most control strategies applied on four-leg NPC are classified as high switching frequency lead to high power losses and low efficiency. In this paper, selective harmonic elimination pulse width amplitude modulation (SHE-PWAM) technique...
The single-stage flyback power factor correction (PFC) converter is well applied in medium and low power occasion such as adapters or LED drivers. Usually, the flyback PFC converter is preferred to operating in boundary conduction mode (BCM) for achieving high power factor (PF) and high efficiency at the same time. However, the conventional BCM control scheme such as input voltage tracking control...
This paper proposes an improved sensorless matrix-converter IPMSM drive system using a high frequency injection method. By suitably choosing different virtual dc-bus voltages and compensating the duty cycle of the switching states, the estimated position error can be obviously reduced. A 32-bit digital signal processor, TMS-320LF-2407A, is used to execute the rotor position estimation and the whole...
In this paper, author present a system which named Triple Furuta pendulum. This system has three pendulums which placed at direct drive motor. Author aim at a realizetion of a stabilization of a Triple Furuta pendulum. For the stabilizing control, author derived the equation of motion by the Eular-Lagrange method and a state equation. Author show structural evaluation based on the condition number...
This paper is focused on the analysis and design of a switching control strategy to correct power factor, to regulate output voltage of a single-phase active three-level rectifier (SPATR) and to guarantee low harmonic distortion using a type of hysteresis current-mode control. The switching criterion is designed analyzing the stability of the switched linear system, to avoid information loss from...
A novel Maximum Power Point Tracking Technique (MPPT) based on Fixed Frequency Model Predictive Control (FFMPC) for Photovoltaic (PV) is developed through this paper. The Proposed control system consists of two-stage. The first stage is a Modified Incremental Conductance (MIC) algorithm and the second stage is FFMPC. The proposed control system has some inherent features such as fast MP tracking under...
In this paper, the development of a novel controller for a bidirectional buck and boost converter is studied to implement an active capacitance. To this end, an averaging method is used to obtain a nonlinear state-space model of the converter in the Continuous Conduction Mode (CCM) for buck and boost configurations, separately. These models are then combined into a state-space representation for the...
This paper presents High-gain power conditioning system for grid connected PV applications. The construction of the proposed system consists of high-gain Switched Inductor Quadratic Boost Inverter (SIQBI) and five-switch h-bridge inverter. The proposed system is controlled to satisfy the following criteria: extract maximum power from PV module, boost dc voltage to higher level and inject sinusoidal...
This paper proposes a numerical algorithm for drawing distribution maps of switching power-converter characteristics on parameter spaces. The concept of the proposed algorithm is that parameters satisfying the assigned conditions are derived and followed with low computation cost. Zero-Voltage-Switching (ZVS) region, output power distribution map, and contour map of power-conversion efficiency of...
Cascaded H-Bridge (CHB) multilevel converters provide a number of attractive features for photovoltaic (PV) power systems. They have high quality output waveforms, high efficiency and the ability to incorporate multiple Maximum Power Point Tracking (MPPT) schemes. This paper investigates the ability of the CHB PV system to export maximum power for different configurations of PV arrays among the H-Bridges...
This paper gives a realization of a swinging up and stabilizing control for a twin furuta pendulums. The twin furuta pendulums has two inverted pendulums which placed at direct drive motor. A control method is a switching of stabilization control and swing-up control. A LQ optimal control is used for stabilization of the pendulums in the neighborhood of upright positions. The effectiveness of the...
The purpose of this paper is to present control characteristics of digital peak current mode dc-dc converter. It is difficult to implement the digital current control. An expensive A-D converter is required in order to sample a current. Furthermore, even if an A-D converter can sample the current, it is also needed the high-performance processor to process the sampling data. The peak current can be...
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