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The 10poles-12slots brushless DC motor is superior as AC servo motor by sine-wave excitation, but its characteristics like efficiency get worse by using as BLDC motor by square-wave excitation. However, 150 degree excitation which adjusted excitation angle and excitation phase can increase 3% of efficiency from general 120 degree excitation, and it can make phase current similar to sine wave. And...
In this paper, buck and boost type AC-AC converters are proposed which are derived from the recently developed switching cell (SC) AC-AC converters. The volume of magnetic components of the SC AC-AC converters is large, and they are also associated with circulating current. The proposed AC-AC converters are free of circulating current and have smaller magnetic volume, therefore they can realize high...
For drive train efficiency estimation, loss models of the battery, an optional DC/DC converter, an inverter and the electrical machine are presented. Harmonic iron losses of the machine caused by current ripple ar'e considered in order to evaluate various modulation strategies and switching frequencies of the inverter. Battery voltage optimizations are analysed regarding the overall drive train efficiency...
This paper presents an innovative Low Losses Modulation of the Matrix Converter. Its principle is to minimize the cumulated switched voltage in each cell by increasing and decreasing progressively the output potential of each matrix cell. This modulation can be applied to all conversion matrices previously proposed for the matrix converter modulation and can be easily implemented with a triangular...
This paper focuses on the determination of suitable carrier based pulse width modulation (PWM) switching and control methods for grid connected modular multilevel converters (MMCs). Characterization of various level-shifted and phase-shifted carrier based PWM methods are provided in terms of output voltage waveforms both for N+1 and 2N+1 level output phase voltages. Carrier based PWM method based...
Analytical methods of power semiconductor loss in a two-level inverter conventionally assume a sufficient number of switching pulses per electrical fundamental cycle. This paper presents a complete analytical expression of power loss even under an infrequent switching condition. The proposed formulae are demonstrated with HEPWM patterns.
Nowadays, the great use of small induction motors in domestic applications and other industrial applications justify the development of new servo-drives and motor designs. The main objective should be to improve the efficiency and to consume energy with a clean absorption of current harmonic from the mains. Thereby, this paper presents an application for the speed control of a small single/two phase...
In order to prolong the lifetime of the implantable cardiac pacemaker. A power supplying system for the pacemaker based on resonant magnetic coupling wireless power transmission is designed. DDS technology is applied to tune the working frequency of the system through the micro-controller AT89S52, and a square wave signal that generated by AD9850 will be utilized as the signal source of the system...
In this paper, a synchronous single-ended primary-inductance DC-DC converter (SEPIC) is designed and simulated within a photovoltaic stand-alone system. This converter has high efficiency of energy transfer from the generator to the load compared to conventional converters; it can maintain the output voltage constant without using the closed loop model. The diode in the converter is replaced by a...
This paper presents a new trend in the transportation industry to adopt the multilevel inverter-based propulsion systems and gives the design procedure of a new dc/ac 3-phase 7-level inverter for powering rail metro cars. The novelty of the proposed inverter lies within the proposed control methodology, which uses a new switching pattern that guarantees a modified space vector pulse with modulation...
This paper proposes an efficiency analysis on an inverter-fed induction motor drive integrating switching losses minimization by D-PWM (Discontinuous PWM) and an ELMT (Electric Loss Minimization Technique) for the motor, either separately or contemporary. This approach allows to benchmark the contribution of both the chosen PWM and ELMT strategies on the total losses. The aim is the development of...
The goal of this paper is to study the additional loss caused by Pulse Width Modulation (PWM), on the one hand in an axial flux permanent magnet synchronous machine (PMSM), and on the other hand in the voltage source inverter (VSI) that supplies the machine. Via a computationally efficient technique, the losses are computed in the stator iron and in the magnets of the axial flux PMSM with PWM supply...
In automotive applications, the Z-source inverter is a single stage inverter that provides the useful feature of boosting the DC-link voltage to a desired value independently of the battery voltage. The advantage of an adjustable DC-link voltage can be used as a degree of freedom for a loss minimized control of electric drives. However, the semiconductors experience high stress during boost operation...
In this work different three-level topologies suitable for PV systems are analyzed. First the basic operation principles of the Neutral Point Clamped (NPC), Active Neutral Point Clamped (ANPC) and Mixed Voltage Neutral Point Clamped (MNPC) topologies are explained and the used PWM strategies are presented. All three topologies are realized in hardware on a modular test setup, so that it is possible...
A new load-insensitive class-E power amplifier mode is presented that that enables frequency reconfigurability by statically changing the switch duty-cycle without compromising its tuned efficiency performance. The technique is tested on a prototype CMOS-GaN class-E Chireix power amplifier designed for 1.8–2.2 GHz. The drain efficiency is more than 55% at 8dB back-off and more than 60% at 6dB back-off...
This paper compares the advantages and disadvantages of I-type 5-level inverter and T-type 5-level inverter, involving the conduction loss, commutation path in reactive power and switching loss, especially at high frequency. Based on the analysis, this paper proposes a novel 5-level inverter for solar system, aiming at reducing both the conduction loss and switching loss at high frequency, and solving...
In this paper three topologies of interleaved boost converters efficiencies are determined by calculating the losses of the components in the converter and compared. Batteries used in REESS are protected by charge controller using PWM technique. Overcharging batteries can reduce battery life or damage them so badly they become unusable; the charge controller regulates the power flow and protects the...
This paper shows a method to saturate the negative sequence current in an active rectifier. The goal is to utilize better the remaining current capacity of the converter, considering that the positive sequence current references have already been decided in a separate synchronous reference frame.
The harmonic elimination problem for the PWM is formulated as a set of transcendental equations, and a conventional solution to this problem needs iterative computation. This paper presents a noniterative algorithm based on a trigonometric harmonic cancellation rule among pulses. The effectiveness of the algorithm was confirmed by simulations and experiments.
In this paper several Pulse Width Modulation (PWM) techniques are implemented and experimentally compared to benchmark their impact on efficiency, Power Quality and EMI of Voltage Source Inverters (VSIs) for DC supplied induction motor drives used in building and land or sea vehicular applications. In particular, both continuous and discontinuous PWM methods have been addressed and experimentally...
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