Title:
IMPEDANCE MATCHING DEVICE, AND CONTROL METHOD
Document Type and Number:
WIPO Patent Application WO/2012/020476
Kind Code:
A1
Abstract:
A reflection coefficient calculation unit calculates a value equivalent to the absolute value of a reflection coefficient on the basis of the voltage of a traveling wave and the voltage of a reflected wave extracted by a traveling wave and reflected wave extraction unit. A phase determination unit compares the phase of the voltage of the traveling wave and the phase of the voltage of the reflected wave, and determines the delay or progression between the phases. An adjustment direction determination unit determines the direction of the read position of a control value on the basis of the phase determination. A read position determination unit selects a first or second storage unit, and selects a first form or second form matching circuit on the basis of the direction of the read position and the step size that changes the read position, and determines the read position. A matching circuit selection unit operates a switch in such a manner that the first form or second form matching circuit selected by the read position determination unit is electrically connected between a transmitter circuit and a transmitting antenna. A control value output unit reads the control value corresponding to the read position determined by the read position determination unit, and applies the control value to the first form or second form matching circuit selected by the matching circuit selection unit.
Inventors:
SUZUKI MASAMI (JP)
Application Number:
PCT/JP2010/063570
Publication Date:
February 16, 2012
Filing Date:
August 10, 2010
Export Citation:
Assignee:
PIONEER CORP (JP)
SUZUKI MASAMI (JP)
SUZUKI MASAMI (JP)
International Classes:
H03H7/40; H04B1/04
Domestic Patent References:
| WO2010067763A1 | 2010-06-17 |
Foreign References:
| JP2005129985A | 2005-05-19 | |||
| JPH07273680A | 1995-10-20 | |||
| JP2010087845A | 2010-04-15 |
Attorney, Agent or Firm:
NAKAMURA, Toshinobu et al. (JP)
Akinobu Nakamura (JP)
Akinobu Nakamura (JP)
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Claims: