{
  "$type": "site.standard.document",
  "description": "In a wireless power transfer system, a resonance circuit is formed only on the secondary coil side, phase information of a resonance current flowing in the resonance circuit is detected, and, base on this phase information, a driving frequency is determined so that the current phase of a driving…",
  "path": "/patents/1421832",
  "publishedAt": "2024-01-03T00:00:00.000Z",
  "site": "at://did:plc:oql6ds5vnff4ugar6rruliwd/site.standard.publication/3mn3ohu7oxx5w",
  "tags": [
    "G01R25/005",
    "WQC INC [JP]"
  ],
  "textContent": "In a wireless power transfer system, a resonance circuit is formed only on the secondary coil side, phase information of a resonance current flowing in the resonance circuit is detected, and, base on this phase information, a driving frequency is determined so that the current phase of a driving current flowing in a primary coil slightly delays from the voltage phase, thereby driving the primary coil. A Q value determined based on a leakage inductance of the secondary coil, a capacitance of a resonance capacitor, and an equivalent load resistance is set to a value greater than or equal to a value determined by Q=2/k2 (k is a coupling coefficient).",
  "title": "WIRELESS POWER TRANSFER SYSTEM"
}