WIRELESS POWER TRANSMISSION SYSTEM

• Main Authors: ONISHI MASAHIDE, KURATA HITOYOSHI, SAEN TSUNEHIRO, NAKANISHI HIROYUKI, MIYAZAWA RYO, OZAWA YASUHIRO
• Format: Patent
• Language: English; Japanese
• Published: 05.10.2017
• Subjects: CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTINGELECTRIC POWER; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER; ELECTRICITY; GENERATION; SYSTEMS FOR STORING ELECTRIC ENERGY

PROBLEM TO BE SOLVED: To provide a wireless power transmission system capable of executing stable power supply, while preventing a high frequency power supply from being damaged by reflection power reliably.SOLUTION: In a wireless power transmission system S1, a high frequency power supply 130 has at least one switching element 150 that is inserted, in series, into a path for supplying AC power to a transmission coil unit 140. When the clearance of a power transmission device 100 and a power reception device 200 is within specification range, assuming the maximum value of power transmission efficiency, i.e., the ratio of output power to input power, is ηmax, the input power is Pin, the number of the switching elements 150 is N, and the absolute maximum rated power of the switching element 150 is Wamp, a voltage converter 230 supplies power to a load so that the power transmission efficiency η, i.e., the ratio of output power to input power, satisfies a following formula (1). η≥{1-(Wamp/2)*N/Pin}*ηmax formula (1).SELECTED DRAWING: Figure 2 【課題】高周波電源が反射電力によるダメージを受けることを確実に防止しつつ、安定した給電が実行可能なワイヤレス電力伝送システムを提供すること。【解決手段】高周波電源１３０は、送電コイルユニット１４０に交流電力を供給する経路に直列に挿入される少なくとも１つのスイッチング素子１５０を有し、送電装置１００と受電装置２００間の離間距離が仕様範囲内において、入力電力に対する出力電力の比である電力伝送効率の最大値をηｍａｘ、入力電力をＰｉｎ、スイッチング素子１５０の素子数をＮ、スイッチング素子１５０の絶対最大定格電力をＷａｍｐとすると、電圧変換器２３０は、入力電力に対する出力電力の比である電力伝送効率ηが、以下の式（１）を満たすように、電力を負荷Ｌｏａｄへ供給するワイヤレス電力伝送システムＳ１。η≧｛１−（Ｗａｍｐ／２）＊Ｎ／Ｐｉｎ｝＊ηｍａｘ 式（１）【選択図】図２