VOLTAGE SWITCHING CIRCUIT, POWER TRANSMISSION DEVICE, AND WIRELESS POWER TRANSMISSION SYSTEM

• Main Authors: YAMAMOTO KOJI, MIYAMOTO HIDEAKI, SAKATA TSUTOMU, SAI SEIHAKU, TABATA OSAMU
• Format: Patent
• Language: English; Japanese
• Published: 30.09.2022
• Subjects: CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTINGELECTRIC POWER; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER; ELECTRICITY; GENERATION; SYSTEMS FOR STORING ELECTRIC ENERGY

To suppress an inrush current which is generated when a semiconductor switch is closed.SOLUTION: A voltage switching circuit comprises: a first semiconductor switch connected between a first DC power source which outputs a first voltage, and a load; a second semiconductor switch connected between the first DC power source and the load, the second semiconductor switch being connected in parallel with the first semiconductor switch; a capacitor connected in parallel with the load between the first and second semiconductor switches and the load; and a drive circuit which drives the first semiconductor switch and the second semiconductor switch. When applying the first voltage to the load, the drive circuit charges the capacitor by performing intermittent drive in which the first semiconductor switch and the second semiconductor switch are opened/closed in difference phases in an intermittent manner, thereafter fixes at least one of the first semiconductor switch and the second semiconductor switch to a closed state.SELECTED DRAWING: Figure 10 【課題】半導体スイッチを閉じたときに生じる突入電流を抑制する。【解決手段】電圧切替回路は、第１電圧を出力する第１直流電源と負荷との間に接続される第１半導体スイッチと、前記第１直流電源と負荷との間に接続される第２半導体スイッチであって、前記第１半導体スイッチに並列に接続された第２半導体スイッチと、前記第１半導体スイッチおよび前記第２半導体スイッチと前記負荷との間において前記負荷に並列に接続されるコンデンサと、前記第１半導体スイッチおよび前記第２半導体スイッチを駆動する駆動回路と、を備える。前記駆動回路は、前記負荷に前記第１電圧を印加するとき、前記第１半導体スイッチおよび前記第２半導体スイッチを、異なる位相で間欠的に開閉する間欠駆動を行うことによって前記コンデンサを充電した後、前記第１半導体スイッチおよび前記第２半導体スイッチの少なくとも一方を閉状態に固定する。【選択図】図１０