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This paper proposes a robotic walker with a standing or sitting assistance function. Although many assistance devices in previous works are specialized in only standing assistance or walking assistance, users need standing, walking and sitting assistance continuously from the same device. Our system focuses on domestic use for people who need nursing in their daily life such as elderly people. To...
This paper presents a new asymmetrical single-phase multilevel inverter topology capable of producing nine-level output voltage with reduce device counts. In order to obtain the desired output voltage, dc sources are connected in all the combination of addition and subtraction through different switches. Proposed topology results in reduction of dc source, switch counts, losses, cost and size of the...
Along with the development of industrial systems, real-time Ethernet (RTE) is widely utilized for control systems. S-TDMA is one of the RTE protocols, and it is a concept realizing a coexistence of real-time and best-effort communication over the Ethernet by time-division multiplexing. In previous work, a special switching hub capable of S-TDMA was implemented, and the capability of real-time communication...
The advent of Silicon-Carbide and Gallium-Nitride MOSFETs offers potential to realize higher energy density power converters operating at increased switching frequencies. The maximum switching frequency in a power converter is limited by the ability of the switching device package to dissipate its switching and conduction losses. At a given value of drain-source voltage and current, the turn-on losses...
Space vector pulse width modulation (SVPWM) is widely used because of their easier digital realization and better DC bus utilization and lower THD. Various types of SVPWM strategies exist. The hybrid SVPWM strategy considers various SVPWM sequences and places the best performance sequence for a given reference vector and it proves to be superior in comparison with the conventional strategies. This...
Doubly fed induction generator (DFIG) is the most implemented electric machine in wind energy conversion systems (WECS) due to reduced size converter, active and reactive power control and economic factors. However, the power electronic stage needs an accurate controller that allows to follow the stator power regulation. As a result, Sliding-Mode Control (SMC) has been successfully implemented in...
A technique of switched stator is employed in a radial Flux BLDC motor to improve the energy efficiency of an electric vehicle. Electric vehicle (EV) certainly, shall be a replacement to the gasoline engine vehicles in near future considering environment protection inadequacy of fuels. This concept is arrived for in wheel direct drive for a two wheeler which doesn't have any transmission mechanism...
This paper proposes a novel configuration of six phase IM to drive from a three phase stacked multilevel inverter. Apart from greater fault tolerance compared to three phase, a six phase machine enables the use of low voltage devices for the inverter. Also the inverter used here is a three phase nine level stacked inverter which itself uses low voltage devices. Thus MOSFETs can be used for the inverter...
The power conversion circuit of a three phase Vienna or Modular-Boost switching power factor corrected (PFC) rectifier uses three controlled switches, eighteen diodes and two output split capacitors. Three PFC controller circuits are necessary for conversion circuit's voltage regulation, power factor control and input current waveform improvement. The circuit has been modified to have fewer active...
Single stage converter system (SSCS) does both dc-dc conversion and dc-ac conversion in one stage. In this paper, a SSCS for photovoltaic (PV) applications is presented. This system can deliver active power from PV to the grid while continuously tracking maximum power point (MPP). The proposed system is controlled such that it can deliver/receive reactive power from grid. The presented system has...
In this paper a generalized formulation for Selective Harmonic Mitigation Pulse Amplitude Modulation (SHM-PAM) has been presented to control Cascaded H-bridge (CHB) inverter with non-equal DC sources. Consistent with the proposed SHM-PAM technique, switching angles are attained constant while the calculated magnitudes of DC sources vary linearly for all modulation indexes (ma). In fact, in the SHM-PAM,...
The high frequency voltage oscillation on the DC/DC gate driver of a H-bridge created during the turn-off intervals of the power switches has critical impact on component reliability and control quality. This noise can propagate freely in the low power plane to other functional circuits of the converter due to the performance degradation of EMI filter in high frequency range above 30MHz. In this paper,...
The fuel cell systems are considered as current intensive sources with low output voltage, so power electronic converters are essential part of fuel cell applications. A dc/dc converter with high voltage ratio and low stress is developed in this paper. The inductors of the output series interleaved boost converter (OS-IBC) are interleaved in parallel at input which can reduce the input current ripple...
A new one-switch three phase power factor corrected (PFC) rectifier is presented in this paper. The proposed 3-phase ac-dc converter is based on Ĉuk topology. Proper feedback control of the circuit can maintain high power factor and low input current total harmonic distortion (THD). Use of minimum number of control switch in the proposed power conversion circuit reduces components, drivers drive isolation...
Solar energy is a promising alternative energy source for a sustainable pollution-free future. Due to the requirements of high efficiency, reliability, power density and low cost, transformerless PV inverters can be utilized in a grid-connected solar energy system. However, this suffers from no galvanic isolation and leakage currents through the stray capacitances between the PV array and the ground...
This paper discusses a cost-effective technique for dynamic testing of DC-DC power supplies, based on the injection of a signal into the feedback loop of a DC-DC regulator, which makes it operating as a dynamic source or a dynamic load. The theoretical background and the practical implementation of the technique are investigated. Guidelines are provided to determine the static set-up and the bandwidth...
An input switch based modular Single Ended Primary Inductor (SEPIC) three phase AC-DC converter is proposed in this paper. The proposed rectifier has the advantage of step-up/down voltage gain with boost input stage. Input boost stage allows input current shaping accompanied by power factor correction. The topology will also provide possible capacitive isolation of input/output sides of the converter...
A novel single phase ac-ac converter with no LC input/output filters is presented in this paper. The proposed converter has all the advantages of the previous single phase impedance source ac-ac converters; it can operate in buck/boost and in-phase/out-of phase with the input voltage, that makes it appropriate for voltage sags/swells compensator without any dc storage. A coupled transformer based...
A novel series input parallel output soft-switching high step-down converter (SIPOSS-HSD) converter is proposed in this paper. The converter consists of two asymmetrical half-bridge high step-down (AHB-HSD) dc-dc converter cells in series input and parallel output connection to share the input voltage and output current. All switches of the proposed SIPOSS-HSD converter can be turned on under zero-voltage...
In this study, the feedback controllers for a power converter were designed and implemented to fulfill the constant-voltage (CV) and constant-current (CC) output modes. The topology used by the DC-DC converter was a phase-shifted full-bridge with a parallel current-doubler rectification converter (PSFB-PCDRC). In order to design the feedback controllers for the PSFB-PCDRC CV and CC operations, the...
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