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A filter design technique using numerical simulation is described and an example is given of the application of our technique for inverters compliant with European standards. We first studied noise generation mechanisms of inverters with a combined method of magnetic field and an electric circuit. We then design X-capacitor filters for category C2 of the European standard using transmission property...
In this paper, the techniques for a gradationally controlled voltage inverter (GCVI), which is a high efficiency inverter, and a high efficiency power conditioner utilizing the GCVI technique for photovoltaic power generation systems are described. A GCVI consists of several inverters operated at different voltages in series and outputs voltage with a sine waveform by combining these outputs. The...
This paper deals with analysis and control of the heat distribution in zone-control induction heating (ZCIH) systems. A ZCIH system consists of two or more split working coils and inverter units, which enables to control the heat and/or temperature distribution on the workpiece by adjusting the current amplitude through each working coil. This paper carries out the theoretical analysis of the generated...
A novel converter using three switching devices, which has a DC input and two single-phase AC outputs, is proposed. A PWM control scheme for the proposed converter is also described in this paper. Moreover, simulation verification of the proposed converter is conducted. As a result, it is shown that the proposed converter can convert electric power bidirectionally among a DC terminal and two AC terminals...
This paper presents an approach of sparse matrix converter (SMC) using Z-source network. The SMC is implemented by connecting a controllable rectifier and the traditional inverter through a Z-source network. The Z-source can produce any desired output voltage by controlling the shoot-through time. Compare to the traditional three-phase SMC, the three-phase Z-source SMC has the same number of switches,...
This paper presents an output current control method for grid-connected voltage-source inverter (VSI) with LCL output filter. LCL filter has been shown to provide a high attenuation to high-frequency harmonics with small physical size than other types of filters, like L and LC filters. However, filter oscillation is the major concern in this type of filter. Different passive and active damping methods...
This paper extends the impedance-source (Z-source) inverters concept to the transformer based Z-source (trans-Z-source) inverters. The original Z-source inverter (ZSI) employs an impedance network of two inductors and two capacitors connected in a special arrangement to interface the dc source and the inverter bridge. It has overcome the conceptual limitations of the traditional voltage-source inverter...
This paper proposes a high performance single-stage transformer isolated AC/DC converter to give high input power factor and low current distortion on the input side and provide stable and low ripple dc voltage on the output side. The proposed AC/DC converter only employs four switches to perform the power factor correction in input side and provide regulation of the output dc voltage magnitude. Thus,...
This paper presents a unidirectional neutral-point-clamped three-level four-wire AC-DC-AC converter topology and studies how space vector modulation and vector control can be applied to the converter. It is shown that either the rectifier or inverter can utilize discontinuous modulation if the injected zero-sequence voltage is properly chosen and a method for balancing the partial DC-link voltages...
The superior properties of silicon carbide (SiC) power electronic devices compared with silicon (Si) are expected to have a significant impact on next-generation vehicles. When super high-speed switching devises such as SiC-VJFET are operated in a power converter, their high dv/dt rate in the rise time and the fall time causes a high-frequency common-mode current. It is necessary to evaluate the EMI...
This paper presents a constant power controller for use in the DC-AC inverter of an electronic ballast for high-intensity-discharging (HID) lamps. The proposed DC-AC inversing stage is a high-frequency combined with low-frequency square-wave-driven half-bridge-type inverter with a constant lamp power control scheme; it supplies the HID lamp with low-frequency square-wave sources to avoid acoustic...
A novel inverter with both high step-up ratio and buck-boost capabilities for distributed energy resources (DERs) is proposed in this paper. A flyback-type auxiliary step-up circuit is integrated to the isolated Cuk-derived VSI to achieve a much higher voltage conversion ratio while avoiding the use of extreme duty ratios of both dc-side switch and inverter side switches. The proposed inverter can...
This paper presents a novel inverter suitable for high-voltage/high-power motor drive applications. The proposed inverter has the advantages of high motor power factor and self-startability, which are not realized by a load commutated inverter (LCI) drive. We have evaluated basic performances by using a downsized test system, and verified that the inverter operates at a motor power factor of 1. In...
With efforts to reduce the cost, size, and thermal management systems for the power electronics drivetrain in hybrid electric vehicles (HEVs) and plug-in hybrid electric vehicles (PHEVs), wide band gap semiconductors including silicon carbide (SiC) have been identified as possibly being a partial solution. Research on SiC power electronics has shown their higher efficiency compared to Si power electronics...
The improvements of the new structure of permanent magnet synchronous motors (PMSM) with the low cogging torque for the ceiling fan is presented. The new type motor is designed by using the phase-shift, half-thickness interior permanent-magnet embedded in oblique slot of rotor is implemented to yield less torque fluctuation and cogging torque. The energy also can be saved at least 50% when the new...
In this paper, the new structure of a position sensorless torque control system for a PMSM in the overmodulation range of an inverter is proposed. The proposed system composed of (1) conventional torque and current controllers, (2) harmonic currents estimator and (3) position/speed estimator. With the proposed system, torque of a PMSM can he stahly control even in the overmodulation range and position...
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