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This paper proposes a Zero-Voltage Ride-Through (ZVRT) method and an LCL filter optimization design method to meet the Fault Ride Through (FRT) requirements for a singlephase grid-tied inverter with a minimized LCL filter. The inverter output current overshoots at a voltage sag when the small LCL filter is used. As a proposed method in this paper, the inverter output current overshoot is suppressed...
This paper proposes spread spectrum methods to reduce radiation noise caused by an inductive power transfer (IPT) system. A noise reduction method with spread spectrum techniques has been proposed. The proposed noise reduction method randomly changes the output frequency of an inverter within a range of 79-to-90 kHz. Changing the output frequency, the radiation noise is spread in a frequency domain...
This paper proposes a power factor correction method of a non-resonant IPT system using a four-winding transformer. The proposed technique is applied to the IPT system with a dual active bridge converter to reduce conduction loss and winding loss. When two pairs of the primary-side and the secondary-side wires are connected in parallel, the low coupling coefficient between the wires driven by in-phase...
This paper proposes a novel Dual Active Bridge (DAB) converter, which has an auxiliary inductor and a bi-directional switch connected in parallel to a transformer in order to achieve zero voltage switching (ZVS) over a wide load range and a wide battery voltage variation. In the proposed converter, the equivalent magnetizing inductance is changed by switching the auxiliary inductance depending on...
This paper presents a magnetically integrated isolated bidirectional three-port DC-DC converter (TPC) that includes an integrated dual active bridge converter (DAB) and non-isolated bidirectional DC-DC converter (NBC), each of which can be independently controlled. The proposed TPC simultaneously uses large, small, and magnetizing inductances, of which the small and magnetizing inductances are used...
This paper proposes a Discontinuous current mode (DCM) feedback current control for the grid-connected inverter in order to achieve the low THD of the grid current at wide load range. In the DCM operation, the nonlinearity between the duty ratio and the current occurs in the current command response, whereas another nonlinearity between the disturbance voltage and the current occurs in the disturbance...
This paper proposes novel V/f control for interior permanent-magnet synchronous motors (IPMSMs) in order to achieve maximum torque per ampere (MTPA) control without motor parameters such as dq-axis inductance and flux linkage of a permanent magnet. The V/f control does not require either information of a rotor position or the motor parameters in order to construct the control system. However, the...
A credit-card sized three-port dc-dc converter (TPC) has been designed and constructed. The TPC has three DC ports in one circuit, and DC power can be transferred without interference mutually. A dual active bridge converter (DAB) and a non-isolated bi-directional dc-dc converter (NBC) are integrated in the TPC by using a technique known as magnetic coupling inductor. Both thermal and soft-switching...
Recently, Electric Vehicles (EVs) have required high power density and high efficiency systems in order to save energy and costs. Specifically, in the DC-DC converter that feeds the non-propulsive loads in these vehicles, where the output voltage is much lower than the one of the energy storage unit. Therefore, the output current becomes quite high, and the efficiency and power density are reduced...
This paper proposes a multilevel flying capacitor dc/dc boost converter (FCBC) with a small capacitance of the flying capacitor for the reduction of converter size. In this paper, the design methods for the boost inductor and the flying capacitor in the n-level FCBC are principally and experimentally confirmed. Furthermore, the boost inductor is designed based on maximum product of voltage-time, regardless...
In many communication systems, lower side lobe level (SLL) of an antenna is desired. In this paper, we have reviewed studies of composite right/left-handed (CRLH) substrate integrated waveguide (SIW) leaky-wave antennas (LWAs) with low SLL by controlling leakage amount of interdigital slots.
The demand of high power Continuous Conduction Mode (CCM) Power Factor Correction (PFC) converter installed in charging devices for Electric and Hybrid Vehicles has grown in the recent years. In these converters, the inductor often appears as the largest component, consequently, the CCM boost PFC converter using coupled inductors is well-known as one of the topologies that can achieve miniaturization...
This paper proposes a Zero Voltage Switching (ZVS) method for an isolated DC to three-phase AC converter using an indirect matrix converter at the secondary side of the transformer. Phase-shift control is applied to the inverter at the primary side of the transformer, while Pulse Density Modulation (PDM) is employed to the indirect matrix converter at the secondary side. The inverter at the secondary...
This paper proposes a Flying Capacitor DC/DC Boost Converter (FCBC) with a small capacitance of the flying capacitor. As a result the size and weight of the proposed converter can be reduced. The capacitance of the flying capacitor is designed based on switching device voltage rating and regardless of the output voltage ripple influences. Moreover, the achieved maximum efficiency of the designed 3-level...
This paper proposes a reactive current control method focusing on a copper loss reduction for a dual active bridge DC-DC converter. The proposed method controls the reactive current using the fundamental wave model of the primary and secondary voltages in the dual active bridge DC-DC converter. However, the total power factor reduced by the harmonic component of the output voltage of the each inverter...
This paper discusses a high-efficiency power supply developed for implementation under low-voltage and high-current conditions for sintering applications such as the Spark Plasma Sintering (SPS) and so on. The proposed system consists of four 2,500-A units of the power supply connected in parallel. The output voltage of the proposed system is very low because load resistance is usually very small...
This paper investigates differences of parasitic inductances caused by DC bus bar patterns on printed circuit boards(PCB). The DC bus bar pattern on the PCB is limited depending on the layout of main circuits and the control circuits. Two patterns which are a laminated wiring pattern and a plane wiring pattern are compared in experiments and simulations. In this paper, it will be clarified that effects...
This paper discusses the conduction noise reduction possibility of a transformer-less three-level V-connection rectifier-inverter system. This circuit is used for the main circuit in an Uninterruptible Power Supply (UPS) system. The efficiency of this circuit is higher than that of the conventional three-phase rectifier-inverter circuit due to no isolated transformer in output side. In this paper,...
This paper verifies an isolated DC-AC power converter using a single phase to three phase matrix converter in experiment. A matrix converter does not require the large reactors and the large smoothing capacitors in a DC-link part. Furthermore, the proposed control method enables zero voltage switching of the matrix converter by implementing a phase shift control on the primary inverter and a pulse...
This paper discusses a development for high output of 2.5 MHz inverter without fast-switching semiconductor switches. This inverter consists of a multi-phase inverter using conventional silicon semiconductor switches and multiple core transformers. In this paper, a principle of drop in inverter output voltage which reduces the inverter output voltage due to a relationship between dead-time and a leakage...
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