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This paper proposes spread spectrum methods to reduce radiation noise caused by an inductive power transfer (IPT) system. A noise reduction method with spread spectrum techniques has been proposed. The proposed noise reduction method randomly changes the output frequency of an inverter within a range of 79-to-90 kHz. Changing the output frequency, the radiation noise is spread in a frequency domain...
Two reduction methods on radiation noise of inductive power transfer (IPT) systems are proposed and experimentally demonstrated. In the IPT systems for electrical vehicles (EVs) or plug-in hybrid electrical vehicles (PHEVs), noise reduction technologies are strongly required because the radiation noise from the IPT system for EVs or PHEVs must not exceeds the limits on standards; for example the regulation...
This paper discusses the performance of an AC-DC converter which converts power from 13.56MHz AC to DC in a receiving side of wireless power transfer systems. The wireless power transfer systems are required to operate in high-frequency such as 13.56 MHz in order to achieve a high power density of transmission coils. Thus the AC-DC converter in the receiving side is demanded to operate at high-frequency...
An AC-DC converter with an input impedance matching for the receiving side of wireless power transfer (WPT) systems is mentioned in this paper. WPT systems are desired to operate in high frequency such as 13.56 MHz. In the high-frequency region, input impedance of the AC-DC converter on the receiving side of the WPT systems should be matched to the characteristic impedance of a transmission line because...
This paper provides experimental verifications of the AC-DC converter for an electrical vehicle (EV) battery charger which an input impedance is matched to a characteristic impedance of a transmission line. In a high-frequency wireless power transfer system such as a magnetic resonant coupling (MRC), the input impedance of the AC-DC converter in the receiving side of the wireless power transfer should...
This paper demonstrates that SiC and GaN diode rectifiers are used in a magnetic resonant coupling (MRC) for wireless power transfer system. The size of the resonance coils, which are used in the wireless power transfer using a MRC, depends on the transmission frequency. So, the MRC is desired to operate at a high frequency in the Industry Science Medical (ISM) band such as 13.56 MHz. In the receiving...
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