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The dc-dc LLC resonant converter can achieve complete soft switching operation in all power semiconductor devices. However, the single phase and interleaved LLC resonant converter required large size smoothing capacitor in the output terminal because the output current ripple of the LLC converter is higher than other isolated dc-dc converter. To solve the problem, the three phase dc-dc LLC resonant...
This paper presents a single phase inverter for the use of transformer-linked interleaved flyback converter. Compared with the core size of conventional type and proposed type flyback converter, the compact and light weight performance of the core are realizable. The power conversion system to propose comprises a flyback converter and a single phase inverter. Since the smoothing capacitor between...
Fuel cell has a lot of advantages like zero emission, high efficiency, little noise, and extremely low vibration. So, it is considered as a suitable alternative source for the portable power supply. However, it needs to be made up for the weak points such as high cost and slow dynamic response. As a representative useful solution to remedy fuel cell's shortcomings, battery is being utilized in various...
This paper presents an analysis of characteristics of choke-input-type diode rectifier circuit on three-phase rectangular-voltage-fed distribution system. The validity of the analysis has been confirmed by experiments using the 2.4 kW prototype.
Renewable energy and high energy efficiency are big challenges today and for the future in research and development. While more than 55 % of the whole generated electric energy is used in electrical drives, lighting systems are not negligible and need up to 20 % (according to the Department of Energy in the USA even 22 %) of power going into the grid. This amount can be reduced by more than 25 % by...
To investigate the ripple current on the output power of solar cells, a testing system is set up to draw triangular currents with different ripples from a solar-cell panel by a boost converter operating from 10 kHz to 100 kHz. The dynamic characteristics of the solar-cell panel are analyzed based on the measured current and voltage waveforms. Experimental results indicate that the output voltage lags...
This paper proposes the power management unit used for the dc feeder in a house. The simulation results show the 7% reduction of the battery Wh rating.
In an isolated DC-DC converter utilized in the HVDC power distribution system, a large surge voltage occurs across the secondary-side diodes due to the transformer's leakage inductance, and then the diodes with a large withstand voltage are required. However, those diodes cause a lot of power loss. In this paper, a simple surge snubber with prominent surge suppression capability is examined, and the...
In renewable energy systems such as the PV system, the batteries are connected to ensure a stable supply of energy. Therefore, the bi-directional power conditioners have a key role in renewable power systems. In this paper, bi-directional LLC resonant converter as the power conditioner is proposed. The ac analysis and operating characteristics of bi-directional LLC resonant converter are investigated.
Inductive Power Transfer (IPT) has recently been proposed for application with Electric or Hybrid Electric Vehicles (EV/HEV), where a highly efficient system operation is demanded for the high-power transfer. Due to the high requirements on the regulation of the output power and the output voltage, and due to the large variations of the magnetic coupling, the control of these systems is a challenging...
One of the most promising technologies for the non-carbon based electricity production is solar photovoltaics. Novel power electronics devices and converters together with new control concepts in the frame of “green electronics” are necessary. For a novel buck-boost converter two controls that make it possible to control the mean value of the output voltage, this is e.g. the voltage across a DC machine...
This research is aimed to present technical loss analysis in Vientiane capital. Electricité du Laos (EDL), the state enterprise company that is responsible for transmission and distribution of electricity in Lao People's Democratic Republic (Lao PDR). The purposes of this research studies are technical line losses and reduce power losses of distribution in Vientiane capital by using CYMDIST program...
This paper discusses suitability of a novel tapped-inductor converter for home DC power supply system. Advantages such as high efficiency, compact size, low cost and high reliability are achieved by the characteristics like the buck converter. A laboratory prototype of a coin size (34mm × 26mm × 5mm), which can convert the voltage from 48V input to 1.2V/30A output, was tested. As a result, maximum...
This paper describes the new soft-switching boost-type dc-dc converter with the coupling inductor for the continuous current mode operation. This configuration enables zero current switching at turn-on in continuous current mode operation. The coupling inductor can commutate the primary side current at turn-off to realize the zero current switching at turn-on and can suppress the overvoltage of the...
This paper reports test results and reviews for the developed plug and socket-outlet applied to the 400 V dc power systems expected to improve energy efficiency in communication sites, data centers, commercial buildings, and smart energy systems. However, there are some safety issues to use 400 V dc power. The plug and socket-outlet has a unique mechanism based on combination of a permanent magnet...
In this study, power factor correction rectifier is proposed for wind turbines with three phase permanent magnet synchronous generators to provide maximum energy conversion efficiency. Reference values for the rectifier are controlled by a fuzzy logic based algorithm to track maximum power point of the wind turbine which varies with turbine characteristics, wind speed, temperature, etc. The proposed...
In this paper a low cost prototype of wireless power transfer system based on air coupling is presented. The system here proposed can be useful for electric vehicle (EV) battery charging systems. It consists mainly of two copper wire coils, placed one in front of the other on the same axis. The inductor coil can easily be placed under the road surface (in a parking), while the other (the receiver...
This paper proposes a new two-stage converter with a coupling capacitor and a coupled inductor. In order to downsize the two-stage converter, two inductors are tightly coupled together. Circuit operation is described in detail. Steady state analysis is performed and confirmed by experiments. It is clarified that the proposed converter has advantages of larger voltage conversion ratio and higher power...
This paper describes a high-speed switching technique of power MOSFETs applied to a chopper and a half-bridge inverter. The switching time must be shortened to operate power converters using the power MOSFETs at high-frequency, but parasitic output capacitance prevents the MOSFETs from turning off fast. In general, the turn-off time becomes longer as a load current is reduced because the reduced drain...
A new prototype of a secondary-side phase shifted (SPS) soft switching PWM dc-dc converter suitable for electric vehicle (EV) battery charging systems is presented in this paper. In the proposed dc-dc converter, soft switching commutations are achievable from full load to no load by utilizing parasitic inductances of the high frequency (HF) transformer. Beside that, no circulating current in both...
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