| US 7,456,516 B2 | ||
| Power line terminating circuit and method, and power line relay device | ||
| Mitsunari Suzuki, Tokyo (Japan) | ||
| Assigned to TDK Corporation, Tokyo (Japan) | ||
| Appl. No. 10/550,147 PCT Filed Mar. 26, 2004, PCT No. PCT/JP2004/004335 § 371(c)(1), (2), (4) Date Sep. 21, 2005, PCT Pub. No. WO2004/088872, PCT Pub. Date Oct. 14, 2004. |
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| Claims priority of application No. 2003-092843 (JP), filed on Mar. 28, 2003. | ||
| Prior Publication US 2006/0214507 A1, Sep. 28, 2006 | ||
| Int. Cl. H02J 3/02 (2006.01); G05B 11/01 (2006.01) | ||
| U.S. Cl. 307—3 [307/DIG. 1; 340/310.13] | 10 Claims |
| 1. A power line terminating circuit provided at terminations of a pair of indoor power lines where a high frequency signal
in a communication frequency band is superimposed on an AC power source voltage, comprising:
a first capacitor provided between the pair of indoor power lines to suppress fluctuations of a capacitive load in an electric
device connected to the terminations of the indoor power lines;
one or more inductors provided on the indoor power lines and configuring a series resonance circuit in cooperation with the
first capacitor; and
one or more resistors respectively provided in parallel with each of the inductors,
wherein the series resonance circuit has a series resonance point in a frequency band which is higher than a frequency of
the AC power source voltage and is lower than the communication frequency band,
the inductors include first and second inductors respectively provided on each of the pair of indoor power lines,
the resistors include a first resistor provided in parallel with the first inductor and a second resistor provided in parallel
with the second inductor, and
the first and second inductors configure the series resonance circuit in cooperation with the first capacitor.
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