This paper presents a high-frequency self-synchronized class E resonant rectifier for a wireless power transfer (WPT) system using a direct voltage detection method. Synchronous rectification increases the efficiency of the WPT system by replacing diodes into switching devices such as MOSFETs. However, in the high-frequency, mid-range WPT system, it is challenging to carry the gate signal from the transmitting side to the synchronous rectifier. In order to overcome this issue, we propose the self-synchronized rectifier without the gate signal from the inverter. The direct voltage detection method synchronizes the gate signal by sensing the input voltage of the L-C resonant filter. Even though a gate driver and a comparator have a 10 ns total propagation delay, the leading phase of the sensing voltage offsets the driver's propagation delay. In the experiments, the proposed rectifier was connected to a class E resonant inverter operating at 13.56 MHz. At an output power of 244 W and a frequency of 13.56 MHz, the total power conversion efficiency of the DC-DC converter is 88.59%.
|Original language||English (US)|
|Title of host publication||ECCE 2020 - IEEE Energy Conversion Congress and Exposition|
|Publisher||Institute of Electrical and Electronics Engineers Inc.|
|Number of pages||6|
|State||Published - Oct 11 2020|
|Event||12th Annual IEEE Energy Conversion Congress and Exposition, ECCE 2020 - Virtual, Detroit, United States|
Duration: Oct 11 2020 → Oct 15 2020
|Name||ECCE 2020 - IEEE Energy Conversion Congress and Exposition|
|Conference||12th Annual IEEE Energy Conversion Congress and Exposition, ECCE 2020|
|Period||10/11/20 → 10/15/20|
Bibliographical notePublisher Copyright:
© 2020 IEEE.
- Class E rectifier
- High-frequency power rectifier