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Applying wireless power transfer (WPT) to transportation applications is one of the best solutions to overcome drawbacks of a limited energy souse in electric vehicles (EVs). Although dynamic charging of EVs can extend their driving distance, control techniques have to be further developed to maintain maximum transmitting efficiency because of parameters variation, e.g. distance change and load change...
A pattern matching method for position sensorless control of IPMSMs having non-sinusoidal inductance spatial distribution in standstill and very low speed region has been proposed. In the proposed method, the rotor position is estimated by comparing the phase current derivatives measured in a real-time with those in advanced. The current derivatives are obtained by measuring the phase currents twice...
This paper introduces an interleaved Boost Power Factor Correction (PFC) converter using the digital controller. Current Sample Correction (SC), Duty Ratio FeedForward (DFF) and Adaptive PID Compensator methods are employed to improve the overall performance of circuit. A 3-kW prototype has been built to verify the feasibility of proposed digital controller
As the penetration level of grid-connected Photovoltaic (PV) systems increases, the power quality is one of the major concerns for system operators and the demands are becoming even stricter. The impact of interharmonics on the grid has been acknowledged in recent research when considering a large-scale adoption of PV inverters. However, the origins of interharmonics remain unclear. Thus, this paper...
The introduction of catenary-free light rail transits (LRTs) in currently urban transportation systems becomes tendency and attractive alternative to traditional fuel cars and LRTs with overhead contact systems. This type of LRT trains are powered through onboard energy storage systems which are elements in an infrastructure that supplies electric energy for recharging of the LRT trains, which requires...
Nowadays, there is a great interest on new magnetic materials and their outstanding properties of low iron losses. However, when a magnetic material is experimentally characterized, it is important to select a suitable sampling frequency specially when the inverter is driven at a high carrier frequency. Nevertheless, iron losses of a magnetic material under inverter excitation are usually underestimated...
The common source inductance is one of the major causes of deterioration of the switching speed and susceptibility of the false triggering for semiconductor switching devices. Practical design of this inductance requires selection of an appropriate semiconductor package because this inductance is greatly dependent on the physical package structure. However, few studies have reported a list of the...
In this paper a position sensorless control applied to a synchronous reluctance machine for an industrial drive application is discussed. For a given stator of an induction machine a synchronous reluctance rotor with flux barriers is designed by finite element methods and a prototype machine is built up. In this application the synchronous reluctance machine drive has already replaced the induction...
This paper proposes a novel LED driver, which consists of an isolated single-switch AC-DC converter with power factor correction (PFC) suitable for streetlight applications. Theoretical analysis of operational modes for the presented LED driver is included. In addition, a 65W-rated prototype circuit of the proposed LED driver with an input utility-line voltage of 110 V has been implemented and tested...
Photovoltaic (PV) energy has been widely interested today because it is clean and endless energy without causing pollution. To produce electricity from solar energy, it would be required an inverter to convert the direct current into alternating current. The inverter is the cause of problems that affect the stability of the power system because it is a switching device served to adjust the frequency...
With the popularization and application of microgrid projects, the multi-microgrids (MMGs) with three-phase / single-phase (TP/SP) architecture is formed in a plurality of adjacent microgrids with certain needs. Due to the complexity of the topology and the diversity of the power supply modes, the MMGs can operate in various modes. It is an urgent problem to realize the flexible seamless switching...
Researches to control water content of Polymer Electrolyte Membrane(PEM) are actively performed for increasing performance & durability of Fuel cell. This Research to control water content focused on measurement of PEM impedance. In this paper, The measurement system of PEM Impedance based on AC impedance method is proposed. Bi-directional DC/DC converter is designed to measurement of PEM impedance...
The increasing number of mobile devices are the main reason for the development of a power bank. However, it needs a physical connection with the portable device in order to transfer power. In recent years, efforts were made to eliminate the need of cords and cables for charging devices. Bluetooth can be used for wireless power transfer. However, the mobile device should be powered-on. In this research...
Bandgap voltage is typically used as the reference voltage of voltage regulators, such as dc-dc converters. Two high-precision CMOS bandgap reference circuits, labeled as current-mode and voltage-mode bandgap circuits, are proposed. The voltage-mode bandgap circuit can work with the supply voltage ranging from 2.5 V to 5V, while the current-mode bandgap works from 1.8 V to 5V. Both of them were designed...
This paper discusses the effect of current measurement error in angle estimation of permanent magnet AC motor for position sensorless control based on motor back EMF. The current measurement errors due to non-ideal elements in the system are classified into the scaling error, the offset error, and the discretization error. Those errors have been represented in the estimated synchronous reference frame...
This paper analyzes the conducted noise generation mechanism of totem-pole bridgeless PFC converter in consideration of frame ground capacitor and LISN at every input voltage zero-crossing. The spike current occurs at zero-crossing and causes severe common mode noise. The frequency range on noise spectrum caused by zero-crossing issue is discussed by mathematical calculation. Furthermore, the experimental...
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