Title:
COMMUNICATION SYSTEM AND ELECTRONIC CHOKE CIRCUIT
Document Type and Number:
WIPO Patent Application WO/2011/102007
Kind Code:
A1
Abstract:
Provided is a communication system using an electronic choke circuit which exhibits a low change in impedance relative to changes in load and enables stable circuit operation by preventing negative resistance. A device is provided with an electronic choke circuit which separates the communication signals and the DC power which are supplied by a management device. The electronic choke circuit is provided with a variable impedance element, which is a transistor in which a collector-emitter is inserted between the first terminal and the third terminal, and an inductor and a resistor, which are connected in series to the variable impedance element. A first resistor and a first capacitor are connected in series, between the first terminal and the second terminal, and one end of the first capacitor is connected to the base of the variable impedance element. A second capacitor is connected between the third terminal and the fourth terminal. A second resistor prevents negative resistance from occurring between the input terminal and the output terminal with regards to the frequency band including the frequency of the communication signals.
Inventors:
KUNIYOSHI KENJI (JP)
Application Number:
PCT/JP2010/062199
Publication Date:
August 25, 2011
Filing Date:
July 21, 2010
Export Citation:
Assignee:
PANASONIC ELEC WORKS CO LTD (JP)
KUNIYOSHI KENJI (JP)
KUNIYOSHI KENJI (JP)
International Classes:
H03H11/40; H03H11/04; H04B3/02; H04Q9/00
Foreign References:
| JP2000341181A | 2000-12-08 | |||
| JPS4918567B1 | 1974-05-11 | |||
| JP2002218512A | 2002-08-02 | |||
| JP2003152503A | 2003-05-23 | |||
| JP2009177420A | 2009-08-06 |
Attorney, Agent or Firm:
NISHIKAWA, Yoshikiyo et al. (JP)
Yoshikiyo Nishikawa (JP)
Yoshikiyo Nishikawa (JP)
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Claims: