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This paper discusses loss reduction of a proposed inverter which outputs a frequency of 13.56 MHz based on a frequency multiplying circuit consists of a multi-phase half-bridge inverter and a multi-core transformer. The proposed circuit realizes loss dispersion to each semiconductors and transformers. As conventional circuits for an Industrial, Scientific, and the Medical (ISM) band, inverters with...
This paper proposes a novel discontinuous PWM (DPWM) in order to reduce dc-link current harmonics of a voltage source inverter (VSI) over wide load-power-factor range. This modulation method, which requires only one carrier, contributes to a lifetime extension of smoothing capacitors in a motor drive system. Furthermore, by realizing this modulation method with only one carrier, a high cost hardware...
This paper presents a novel space vector modulation (SVM) which reduces current harmonics flowing through a DC-link capacitor of a three-level inverter employed for three-phase motor drive systems. In order to reduce the input current harmonics, the space vectors are selected to minimize the difference between the instantaneous value and the average value of the input current by using the magnitude...
This paper proposes space vector modulation (SVM) which reduces the current harmonics flowing through the DC-link capacitor of three-phase motor drive systems. In a conventional SVM, the selection of the space vectors results in the long zero vector period, which increases the inverter input current harmonics. On the other hand, in the proposed SVM, the space vectors are selected in order to actively...
Two reduction methods on radiation noise of inductive power transfer (IPT) systems are proposed and experimentally demonstrated. In the IPT systems for electrical vehicles (EVs) or plug-in hybrid electrical vehicles (PHEVs), noise reduction technologies are strongly required because the radiation noise from the IPT system for EVs or PHEVs must not exceeds the limits on standards; for example the regulation...
In this paper, the open-loop control for permanent magnet synchronous motor (PMSM) driven by a square-wave voltage is proposed. The proposed control is able to transit from the PWM region to the square-wave voltage region via the over modulation region seamlessly. When the PMSM is driven by the square-wave voltage using the proposed control, the low-frequency torque vibration except 6th or 12th order...
This paper introduces performance of a power leveling system with a 3.0-MJ, 2900-r/min of flywheel energy storage for multiple parallel operations. In terms of cost reduction and improvement efficiency, this system uses low cost ball bearings at the low speed. Moreover, the system is composed by not a large capacity flywheel but many flywheels with small energy capacity but the cost reduction of the...
This paper discusses the pulse density modulation (PDM) control methods for a single-phase to three-phase matrix converter (MC) in the high-frequency application. This converter outputs a commercial power grid frequency, i.e. 50 Hz or 60 Hz from the input of several-hundred-kHz frequency. The proposed circuit achieves zero voltage switching operation by using the PDM control method. In this paper,...
This paper discusses an isolated three-phase AC-DC converter using Modular Multilevel Converter (MMC) topology for a medium voltage application. The MMC at a primary stage of an isolated AC-DC converter directly obtains the high frequency AC voltage from the three-phase AC voltage of the commercial frequency. In addition, the proposed system obtains the low total harmonic distortion (THD) in the input...
In this paper, an optimal converter drive method for Permanent Magnet Synchronous Motor (PMSM) with a 3-level inverter is discussed in terms of loss minimization. The 3-level inverter can change an operation mode between two modulations namely, PWM and 1'pulse modulation at a decided point. In this paper, we discuss the interchange point for the two modulations subject to the total loss of PMSM drive...
This paper discusses pulse density modulation (PDM) control methods for a single-phase to three-phase matrix converter for high-frequency applications such as the grid interface converter for a wireless power transfer system and high-frequency transformer link system. The input frequency for this converter is assumed as several hundred kHz, and at the same time outputting a commercial grid frequency,...
This paper discusses the PDM (Pulse Density Modulation) control method for a single-phase to three-phase matrix converter (MC) in the high-frequency application. The proposed circuit is used as an interface converter for a wireless power transfer system. This converter can input a several hundred kHz frequency and outputting a low frequency, ie 50 Hz, for commercial power grid. The proposed circuit...
This paper evaluates total loss of an induction motor and a permanent magnetic motor drive system applying two various modulation strategies on each motor, which are the PWM operation and the six-step operation. At first, the loss analysis is implemented based on the theoretical model of an inverter and an induction motor. As a result, when the leakage inductance is less than 25%, the PWM drive should...
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