[특허]Method and structure for coupling power-line carrier current signals using common-mode coupling

Method and structure for coupling power-line carrier current signals using common-mode coupling 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	H04M-011/04
출원번호	US-0028487 (1993-03-09)
발명자 / 주소	Pettus Michael G. (Aptos CA)
출원인 / 주소	Metricom, Inc. (Los Gatos CA 02)
인용정보	피인용 횟수 : 89 인용 특허 : 0

초록 ▼

An apparatus and a method for communicating data among transceivers in an electrical utility distribution system where a signal path between the transceivers includes multiple power distribution transformers is described. A first transceiver, common-mode coupled to a secondary of a first power distribution transformer transmits a carrier signal modulated by a data stream to the secondary. The modulated signal is transferred to the primary of the first power distribution transformer which is coupled to the primary of a second power distribution transformer. A second transceiver, common-mode coupled to a secondary of the second power distribution transformer, receives the modulated signal from the secondary. Both transceivers are protected from the high power delivered at the line frequency by filtering capacitors which attenuate signals at the line frequency and pass signals at the carrier signal frequency.

대표청구항 ▼

A power line carrier communication system for communicating between a first subscriber site and a second subscriber site of a power distribution system which conveys power at an alternating current power line frequency, where the first subscriber site is coupled to a common primary distribution line through a first distribution transformer and the second subscriber is coupled to the common primary distribution line through a second distribution transformer, comprising: a transmitter at the first subscriber site which outputs a signal at a transmitter output, said signal being referenced to an earth ground and being a modulated carrier signal characterized by a carrier frequency, said carrier frequency being different from the power line frequency; first secondary distribution means coupled to a secondary side of the first distribution transformer and to a first power feeder at the first subscriber site for distributing power to said first power feeder; second secondary distribution means coupled to a secondary side of the second distribution transformer and to a second power feeder at the second subscriber site for distributing power to said second power feeder; a first plurality of coupling capacitors, wherein each of said coupling capacitors is coupled at a first terminal to said transmitter output and is coupled at a second terminal to a line of said first secondary distribution means; and a second plurality of coupling capacitors, wherein each of said coupling capacitors is coupled at a first lead to a line of said second secondary distribution means; and a receiver at the second subscriber site, commonly coupled at an input to a second lead of each one of said second plurality of coupling capacitors, said input receiving said signal from said transmitter as a voltage relative to said earth ground, said signal received after propagating through said first plurality of coupling capacitors, said first distribution transformer, the common primary distribution line, said second distribution transformer, and said second plurality of coupling capacitors.

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IPC	Description
A	생활필수품
A62	인명구조; 소방(사다리 E06C)
A62B	인명구조용의 기구, 장치 또는 방법(특히 의료용에 사용되는 밸브 A61M 39/00; 특히 물에서 쓰이는 인명구조 장치 또는 방법 B63C 9/00; 잠수장비 B63C 11/00; 특히 항공기에 쓰는 것, 예. 낙하산, 투출좌석 B64D; 특히 광산에서 쓰이는 구조장치 E21F 11/00)
A62B-1/08	.. 윈치 또는 풀리에 제동기구가 있는 것

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Method and structure for coupling power-line carrier current signals using common-mode coupling 원문보기

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Method and structure for coupling power-line carrier current signals using common-mode coupling 원문보기

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