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This paper deals with bidirectional AC-DC converter with high power efficiency and high power factor, in which the novel FPGA control strategy is applied. The prototype bidirectional AC-DC converter of the rated power of 2kW is made and tested. As a result, in both forward operation mode and regenerative one, the power efficiency is at 97.0% at the rated output power of 2kW, is over 98.0% at 25% output...
This paper presents a novel and reliable DC switch and DC socket for high voltage DC power feeding system, in which the arc does not occur when the are turned on/off and inserted/removed, respectively. The novel prototype DC switch and DC socket have been made. Both are almost same circuit configuration and operation principle and then composed of two mechanical relays and a single MOSFET. It has...
This paper deals with the multi-input DC-DC converter with high power efficiency. A novel full-bridge type zero voltage switching (ZVS) multi-input DC-DC converter is proposed, in which the circulation current induced by the currents through the other windings of its transformer is interrupted by the additional switches. The prototype two-input DC-DC converter is made and examined. As a result, the...
It is often required in the robot and battery charging systems that the primary side of the input power source and secondary side of the load should be isolated by the transformer and that the output voltage should be regulated in the primary side. This paper presents a novel output voltage regulation strategy in the primary side of flyback converters. Also, the nonlinear control is useful to perform...
Recently, the high voltage DC feeding system has been researched and developed to save electrical energy and to make use of the green energy from the solar cell, wind turbine and so forth. This paper presents a novel high efficiency DC-DC converter for isolation in high voltage DC feeding systems. The prototype 4.0kW bidirectional DC-DC converter has been made and tested. As a result, in the forward...
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