Wireless power transfer system for LED display board by using 1.8 MHz magnetic resonant coils

Author

Cho, In-Kui ; Kim, Seong-Min ; Moon, Jeong-Ik ; Yoon, Jae-Hun ; Byun, Woo-Jin ; Choi, Jae-Ick

Author_Institution

Radio & Broadcasting Res. Div., ETRI, Daejeon, South Korea

fYear

2011

fDate

9-11 Nov. 2011

Firstpage

1

Lastpage

4

Abstract

A wireless power transmission system for 1.8MHz, 20W LED display board using coupled magnetic resonances is presented. The proposed wireless power transmission system consists of a 50W class-F power transmitter, two magnetic resonance couplers and 20W full bridge RF rectifier receiver. The transmitter is composed of DDS (Direct Digital Synthesizer) block, class-F power amplifier and VSWR measurement block to implement the frequency searching and power tracking function. Two magnetic resonance couplers are designed with a small spiral resonator. The diameter size of the spiral coil is 30 cm (1.8λ/1000). The receiver is composed of RF rectifier, overvoltage protection (OVP) with active dummy load and DC to DC converter. The power consumption of the LED display board is about 20W and the entire efficiency of this WPT system is 43.5%.

Keywords

LED displays; direct digital synthesis; magnetic resonance; rectifiers; DDS; LED display board; VSWR measurement bl; class-F power amplifier; class-F power transmitter; coupled magnetic resonances; direct digital synthesizer; frequency 1.8 MHz; full bridge RF rectifier receiver; magnetic resonant coils; power 20 W; wireless power transfer system; Frequency separation; Magnetic resonance; Power transmitter; RF rectifier; Wireless power transmission;

fLanguage

English

Publisher

ieee

Conference_Titel

Electromagnetic Compatibility Symposium - Perth (EMCSA), 2011

Conference_Location

Perth, WA

Print_ISBN

978-1-4673-1254-7

Type

conf

Filename

6248119