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This paper proposes the high-voltage high-frequency power supply for an ozone generator using a phase-shift pulse width modulation (PWM) full bridge inverter with constant applied electrode voltage. The circuit operation is fully described. The high-frequency transformer and ozone generator mathematical models are also included for preliminarily calculating of instantaneous voltages and currents....
This paper proposes a single-pulse operation control for Matrix converters where the single-pulse operation is controlled to synchronize with the output frequency. There are two known problems for the synchronize control; firstly, the beat-frequency components occurs in the output current, and secondly, the input power factor should be controlled as unity. To solve these problems, this paper proposes...
This paper deals with a new PWM control scheme of matrix converters, which have been proposed by the authors. The PWM control scheme is characterized by the calculation algorithm using pseudo inverse and the performance that the output voltage can be controlled completely even if the input voltage is distorted. An experimental system, which consists of a matrix converter main circuit and a control...
This paper presents a novel PWM strategy of single-phase to three-phase matrix converters with a small capacitor compensating for single-phase instantaneous electric power fluctuation. The output voltage and input current references of the small capacitor to obtain unity input power factor are derived. The PWM strategy with the only four commutations of all the three phases during a control period...
A new circuit topology, Multi-DC Tap, in which several switching devices with anti-parallel diodes are connected in series to enable several arbitrary DC terminal voltages from a common DC link, is proposed. The control switching pattern for the Multi-DC Tap is investigated based on the direction of each terminal current and its buck/boost operation conditions. As a result, a simple strategy for switching...
This paper proposes a non-isolated converter that is based on a flyback topology. The proposed converter has high conversion ratio and achieves higher efficiency with reduced voltage and current stresses on the power semiconductors when compared to the conventional flyback converter. Analysis and key converter operating waveforms are reported in the paper. Experimental results taken from a 60 W laboratory...
In order to describe the voltage and current waveforms of a switch-mode power supply (SMPS) accurately by simulation the parasitic output capacitance of the MOSFET cannot be neglected. For this reason the paper describes and compares two different simulation methods which take this capacitance into account without extending the simulation time considerably, so that a fast and accurate transient simulation...
Due to their basic physical properties, power MOSFETs exhibit an output capacitance Coss that is dependent on the drain-source voltage. This (nonlinear) parasitic capacitance has to be charged at turn-off of the MOSFET by the drain-source current in rectifier applications which yields input current distortions. As a detailed analysis shows, the nonlinear behavior of this capacitance is even more pronounced...
A direct converter to connect two DC voltage sources and AC motors is investigated in this paper. The circuit configuration is available to save the more regenerative brake energy with usage of Electro Double Layer Capacitors (EDLCs) in the dc power fed railway vehicles. A PWM method in the higher motor frequency range is proposed and is verified by numerical simulation results.
The two-level PWM inverter has expanded in industrial applications because it was able to achieve maintainability and high performance to surpass the DC drive by the development of the vector control and the IGBT (Insulated Gate Bipolar Transistor). However, as the main motor drive of the metal plant rolling mill, the two-level inverter output voltage was too low and capacity was too small, so the...
In recent years, many topologies have been developed as PV module integrated converter for AC module system. Among these topologies, the flyback-type power converter have been occupied the attention due to its simplicities on configuration and control. In this paper, dual mode switching control method for flyback-type PV module integrated converter is proposed. Proposed switching control method changes...
In this paper, a cell balancing circuit for the Lithium-ion battery string based on the Flyback topology is proposed. The proposed circuit draws the charge out of the high voltage cell and recovers it to the overall battery pack. With the selectivity of the target cell, the proposed circuit uses the minimized power path to simplify the circuit and optimize the balancing efficiency. The circuit also...
This paper concerned with an advanced practical development of utility grid-tied 3 phase voltage source type is instantaneous current controlled inverter with minimized pulse switching number-based pulse modulation strategy. It is a key issue that newly-proposed utility inverter incorporates a new conceptual extended neutral point voltage shifting module into the d-q synchronous rotating cordinate...
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 presents a new simplification of Space Vector Pulse Width Modulation (SV-PWM) for two-level three-phase inverters. The look-up tables with formulas about switching times and states were replaced by simple arithmetic and boolean equations. The explicit identification of the sector where the reference space vector is located was also eliminated. This paper proposes the rotation of reference...
This paper describes about the method for harvesting the new source of renewable energy from lightning stroke in a small-scale system. It is known that lightning can produce huge scale of electricity. The restriction in harvesting the gratis lightning energy is regarding the process to detain and store the energy within a microsecond according to the typical lightning wave shape. Due to that, a small-scale...
Multiple-input dc/dc converters (MICs) serving as the interface of several sources with a load provide the energy to the load simultaneously or individually, which can optimize the utilization of sources, simplify the system structure and reduce the overall cost, so they are attractive for the hybrid renewable power system. In this paper, a novel method using the alternative pulsating sources as the...
In this paper, a soft switching interleaved boost converter for photovoltaic power generation system is proposed. It is a topology, which raises efficiency for DC-DC converter of photovoltaic PCS(Power Conditioning System). And it minimizes switching losses, input current ripple and output voltage ripple by adopting soft switching method using resonance. The detailed mode analysis of proposed topology...
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 describes the design and operation of a 6-kW, full-bridge, zero-voltage switching, bidirectional isolated dc-dc converter for a 2-kWh lithium-ion (Li-ion) bank that is considered attractive as an energy storage system for applications to photovoltaic generation systems ranging from 10 to 30 kW. The dc voltage at the high-voltage side of the converter is controlled from 305 to 355 V as the...
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