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In a standalone photovoltaic (PV) power generation system, the author previously proposed a new type of MPPT (Maximum Power Point Tracking) control method in which the I–V characteristics are scanned with detection interval control at specified intervals and the maximum power point is monitored. The author obtained satisfactory results using this new MPPT control method. This paper investigates applying...
This paper proposes a novel multiple-input bidirectional DC-DC power converter to interface more than two dc sources of different voltage levels. This finds applications in distributed energy resources (DER), micro grid, and hybrid electric/fuel cell vehicles, where different dc sources of unequal voltage levels need to be connected with bidirectional power flow capability. Converter can be used to...
In this paper, a controller design is introduced for a interleaved dc-dc converter with an LCLC-filter. In order to design an accurate controller of the bidirectional converter, a new model is proposed. First, it introduces the bidirectional converter small-signal model using a state-space averaging method and derives the required transfer functions. Second, transfer functions of the bidirectional...
Recent advances of GaN Gate Injection Transistors (GITs) and their applications to power switching systems are reviewed. The GITs are fabricated on cost effective Si substrates in a large diameter up tp 6inch, which exhibit normally-off operations by the use of p-AlGaN over an AlGaN/GaN hetero-junction. The GIT is free from the current collapse up to 600V enabling reliable operation of the power switching...
The aim of this paper is to present static and dynamic analyses of digital peak current mode dc-dc converter. The current detection circuit of the proposed method consists of RC integrator and comparator as the AD converter. The proposed method can detect the peak current in real time. Analyses and the transient response of proposed method are discussed in this paper. As a result, the convergence...
A non-isolated DC-DC converter is presented, based on the current diverter principle. The converter is foreseen for larger photovoltaic plants or other DC collection networks for renewable energy sources. The topology allows the DC-DC conversion as step-up converter typically from LV to MV levels. The Multistage Stacked Boost Architecture allows a conversion to voltage levels higher than the blocking...
The paper presents a novel modeling approach of the power flow in a bidirectional dual active bridge DC-DC converter. By using basic superposition principles, the mathematical distinction of cases is avoided in the modeling process of high-frequency transformer currents for different types of modulation. The generalized model is used in an optimization of converter losses of a 3.3 kW electric vehicle...
Contactless DC connector has been proposed for the next generation 380 V DC distribution system in data centers. A LLC resonant DC-DC converter topology with Gallium Nitride (GaN) power transistors has been applied to realize the short-distance inductively-coupled connector. A prototype of a 1.2 kW 384 V–192 V connector has been fabricated under 500 kHz operation. The conversion efficiency of 95%...
This paper describes design guideline on optimized on-off switching control to improve overall power conversion efficiency of paralleled converter system. The optimized on-off control changes the number of active modules according to load current. Key point of the control is to determine the on-off points of converter modules. Design guideline on determining optimized switching points is shown by...
This paper studies the digital controlled dc-dc converter which employs the neural network in coordination with PID control. Especially, we focus on the problem of overcompensation to the transient response of the output voltage in the dc-dc converter by the neural network control. Our previous studies suggested that the neural network control is effective to improve the transient response of the...
In the newly proposed wire communication system, converters are utilized as transmitter as well as power supply. Signal transmission is performed by the use of output voltage ripple. At transmission of a message, the ripple is intentionally increased and modulated by the signal. In this paper, the output filter capacitor of the dc-dc converter is changed according to reception or transmission. At...
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