In this research, from the viewpoint of EMC (EMI and immunity), we evaluate the load-side immunity of switching power supply in resistive load and examine the countermeasures. In the previous report, EMI countermeasures revealed that the frequency spreading factor (Δf / RBW, Δf: spread width) affects the reduction effect. Since noise is bidirectional (EMI and immunity are in opposite directions), we considered that EMI countermeasures could be effective as a means of immunity countermeasures, and focused on the possibility of immunity countermeasures using frequency spreading.
This paper presents an energy management storage system with a multi-stage FET bidirectional converter. The
proposed system is constructed by a bidirectional converter using series connected FETs, and it realizes highly energy management that maximizes battery performance. By calculating the power loss using the converter performance index FOM (Figure of merit), it is shown that the proposed configuration can be possible to reduce the power loss 70% compared to the conventional configuration. In the proposed system, using a power control method that reduces the charging current, the battery charging losses can be reduced 60%. The analysis results show that the proposed system can achieve a charging energy efficiency of 96.9%, and reduce the yearly CO2 emission of 33%.
This paper deals with a single-ended bidirectional WPT system which ensures productivity and compatibility for
practical application. The previous system has a problem of transfer power dramatic change by circuit small variations. Authors studied about power fluctuation factors, then proposed has been phase shift control as the proposed solution.
In this paper, we propose a new SiC-VMOSFET single-ended converter that realizes a low-cost, compact and
lightweight wireless EV charger, which is the key device for the popularization of electric vehicles in recent years. A three-fold transfer power and 1/6 power device loss have been achieved by an improved drive pattern, a newly developed V-groove trench SiC-MOSFET, and a new type of low switching loss circuit topology.
Electric vehicles (EV) are expected to solve the environmental problems because of high-efficiency operation without CO2 and
NOx emissions. In order to create a charging infrastructure by installing equipment in such as locations as carports in private homes, the
wireless battery charging system is very suitable. Furthermore, the wireless EV charger is suitable for autonomous vehicles and is expected
to contribute to the spread of electric vehicles. However, misalignment between the power feeding and the power receiving coils causes
decreases in transmission power and efficiency. In this paper, proposed is a new method of position detection by analyzing voltage difference
of search coils which can obtain the required accuracy with a simple configuration.
Due to the configuration of separated SubModule (SM) capacitors, factory operation test and system test at installation site for STAtic synchronous COMpensator (STATCOM) using Modular Multilevel Converter (MMC)’s require an energization of capacitors from AC bus. However, from the stability point of view of the connected power system, the impact on the AC bus is desired to be minimum. The authors propose novel test methods and performed the tests using practical type of MMC STATCOM.
The test results proved that the STATCOM performance can be tested based on requirements of IEC 62927 and CIGRE TECHNICAL BROCHURES 697.