{
  "$type": "site.standard.document",
  "description": "In order to provide an electric power transmission system capable of building the system at low cost without the need for complex circuits that determine an optimum frequency, an electric power transmission system of the present invention, which transmits electric energy via an electromagnetic…",
  "path": "/patents/964243",
  "publishedAt": "2015-01-07T00:00:00.000Z",
  "site": "at://did:plc:oql6ds5vnff4ugar6rruliwd/site.standard.publication/3mn3ohu7oxx5w",
  "tags": [
    "B60L53/122",
    "EQUOS RES CO LTD [JP]"
  ],
  "textContent": "In order to provide an electric power transmission system capable of building the system at low cost without the need for complex circuits that determine an optimum frequency, an electric power transmission system of the present invention, which transmits electric energy via an electromagnetic field from a power transmission antenna (140) to a power receiving antenna (210), is characterized by including: an inverter unit (130) that converts DC voltage to AC voltage of a predetermined frequency to output; a power transmission-side control unit (150) that controls in such a way as to keep a drive frequency of the inverter unit (130) at a predetermined frequency, and controls a voltage value of DC voltage input to the inverter unit (130), and controls in such a way that a power value output from the inverter unit (130) is kept at a constant level; the power transmission antenna (140) to which AC voltage is input from the inverter unit (130); a rectifying unit (220) that rectifies an output of the power receiving antenna (210) to obtain DC voltage, and outputs the DC voltage; a step-up and step-down unit (230) that steps up or down DC voltage output from the rectifying unit (220) to output; a battery (240) that is charged with an output of the step-up and step-down unit (230) ; and a power receiving-side control unit 250 that controls the step-up and step-down unit (230) in such a way as to charge the battery (240) with maximum efficiency, and thereby controls in such a way that the drive frequency of the inverter unit (130) remains unchanged regardless of a coupling coefficient between the power transmission antenna (140) and the power receiving antenna (210).",
  "title": "POWER TRANSMISSION SYSTEM"
}