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This paper proposes a power-circulating operation at light load operation for a parallelly-connected dual-active-bridge (DAB) converter in order to achieve zero voltage switching (ZVS) over entire load range and wide battery-voltage variation. At the light load, a power flow of each DAB converter is controlled in such a way that the transferred power of each DAB converter satisfies the condition for...
This paper clarifies the relationship between the current ripple and the power density in bidirectional DC-DC converters. In the conventional power density design method, in order to obtain the pareto-front curve of the power density and the efficiency, the current ripple is designed as constant value, whereas the switching frequency is varied. As a result, the possibilities of higher power density...
The paper proposes a high boost ratio of modular Marx topology DC-DC boost converter (MTBC). In the proposed converter, the parallel-connection is applied at the input side and multi-stage connection is applied at the output side. Then, the conduction loss and the voltage rating of switching components can be reduced. Therefore, with the proposed circuit configuration, high efficiency of the high...
This papar proposes which the Dual Active Bridge (DAB) converter changes between Full Bridge (FB) converter's operation and Half Bridge (HB) converter's operation on the secondary side of the high frequency transformer depending on the output power. With the HB converter operation's, the iron loss of the transformer becomes small because the secondary voltage of the transformer becomes half compared...
In this paper, three types of the gate drive circuits; voltage source, current source with continuous current and current source with discontinuous current gate drive circuits are compared from the view point of power consumption of the three types of the gate drive circuits and the switching loss of the main MOSFET. It is confirmed that the power consumption of the gate drive circuit is reduced by...
This paper discusses an isolated three-phase AC-DC converter using Modular Multilevel Converter (MMC) topology for a medium voltage application. The MMC at a primary stage of an isolated AC-DC converter directly obtains the high frequency AC voltage from the three-phase AC voltage of the commercial frequency. In addition, the proposed system obtains the low total harmonic distortion (THD) in the input...
This paper proposes a linear PFC regulator for LED lighting applications. The proposed circuit is small in size because the circuit structure consists of only semiconductors and resistors without any reactors and electrolytic capacitors. The current bypass circuit which is connected in parallel to the LED string consists of single MOSFET, two zener diodes and two resistors. The MOSFET is operated...
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