[특허]Printed circuit board including EMI reducing circuits, an information processing apparatus having the board and a method to select the circuits

[미국특허] Printed circuit board including EMI reducing circuits, an information processing apparatus having the board and a method to select the circuits 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	H01Q-011/12
출원번호	US-0347367 (2003-01-21)
우선권정보	JP-0098833 (1998-04-10)
발명자 / 주소	Shiotsu, Shinichi Shiba, Akira
출원인 / 주소	Fujitsu Limited
대리인 / 주소	Staas & Halsey LLP
인용정보	피인용 횟수 : 5 인용 특허 : 22

초록 ▼

A printed circuit board (PCB) has a plurality of electromagnetic interference (EMI) reducing circuits, which reduce electromagnetic waves emitted from the PCB, and a plurality of switching devices, such as MOS transistors, relays and DIP switches, to enable and disable the EMI reducing circuits. The EMI reducing circuits connected between border portions of a voltage and a ground layers in the PCB include at least a capacitor. A combination of the EMI reducing circuits which gives a minimum amount of electromagnetic waves emitted from an apparatus including the PCB is selected as a suitable combination of EMI reducing circuits. An information processing apparatus having the printed circuit boards has means for selecting a combination of the EMI reducing circuits which allow the minimum EMI emitted for the apparatus.

대표청구항 ▼

1. A printed circuit board having a printed circuit pattern comprising:a plurality of EMI reducing circuits arranged on said printed circuit board, each of said EMI reducing circuits including:a circuit element for decreasing electromagnetic radiation from said printed circuit board, anda switching device selectively connecting said respective circuit element to a portion of said printed circuit pattern for enabling and disabling said circuit element, wherein each of said switching devices independently enables said respective circuit elements based on a desired circuit constant of the respective EMI reducing circuit. 2. The printed circuit board according to claim 1, said printed circuit pattern comprising a voltage layer and a ground layer, wherein:each of said circuit elements comprises at least a capacitance element; andsaid EMI reducing circuit is connected between said voltage layer and said ground layer. 3. The printed circuit board according to claim 2, wherein said EMI reducing circuit is connected to at least a border portion of said voltage layer or said ground layer. 4. The printed circuit board according to claim 1, wherein said switching device comprises a transistor. 5. The printed circuit board according to claim 1, wherein said capacitance element is a backward-biased diode. 6. The printed circuit board according to claim 1, said printed circuit pattern comprising a signal line, wherein:said circuit element comprises at least a resistant element; andsaid EMI reducing circuit is connected in series with said signal line. 7. A printed circuit board comprising:a plurality of EMI reducing circuits arranged on said printed circuit board, each of said EMI reducing circuits including:a circuit element to decrease electromagnetic radiation from said printed circuit board, anda switching device to electrically connect or disconnect said respective circuit element between a portion in a periphery of a voltage layer of said printed circuit board to supply electric current to circuitry mounted on said printed circuit board and a portion in a periphery of a ground layer of said printed circuit board,wherein each of said switching devices independently enables said respective circuit element based on a desired circuit constant of the respective EMI reducing circuit. 8. A printed circuit board according to claim 7, wherein one of said voltage layer and said ground layer is provided as an outermost layer of electrically conductive layers of said printed circuit board. 9. A printed circuit board according to claim 7, wherein said EMI reducing circuit includes a capacitor as said circuit element and a transistor as said switching device. 10. An apparatus having a circuit pattern, comprising:a circuit arranged on said apparatus, comprisinga plurality of circuit elements to decrease electromagnetic radiation from said apparatus, anda plurality of switching devices to enable and disable all of said circuit elements or selected ones of said circuit elements, based on a desired circuit constant of the circuit. 11. An apparatus according to claim 10, wherein said switching device selectively connects said circuit element to a portion of said circuit pattern to enable and disable said circuit element. 12. A printed circuit board comprising:a printed circuit pattern; andfirst and second EMI reducing circuits, each of said EMI reducing circuits comprising:a circuit element to decrease electromagnetic radiation from said printed circuit board, anda switching device to independently connect said circuit element to a portion of said printed circuit pattern to enable and disable said circuit element based on a desired circuit constant of the respective EMI reducing circuit. 13. The printed circuit board according to claim 12, wherein the switching devices enable a selected plurality of the circuit elements simultaneously. 14. The printed circuit board according to claim 1, wherein a plurality of the circuit elements are simultaneously conn ected from a disconnected state to the respective portions of the printed circuit pattern.

이 특허에 인용된 특허 (22) 인용/피인용 타임라인 분석

Hill Ralph Leon (Pepperell MA) Pratt Noel C. (Van Nuys CA), AM broadcast band interference filter for line-powered telephone.
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Kastner Mark, Apparatus and method for dimming a gas discharge lamp.
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Batten ; Jr. L. Eugene ; McCulloch Dennis A. ; Kim John, Assemblies of printed circuit boards and flexible containers therefor.
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Graf Alfons,DEX, Circuit configuration with reduced EMI.
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Singh Steve Sevak,GBX, Controlled commutator circuit.
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Morita Shigeki (Himeji JPX), Current control circuit for an electromagnetic type actuator.
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Ohashi Takeo (Suita JPX), Electronic switching device having reduced power consumption.
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Bhagwat Pradeep M. (Baltimore MD) Prasad Atluri R. (Fords NJ) Justo Chadd D. (Jersey City NJ), Lossless snubber circuit for use in power converters.
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Yutaka Akiba JP; Yasunori Narizuka JP; Hirayoshi Tanei JP; Naoya Kitamura JP, Low-EMI electronic apparatus, low-EMI circuit board, and method of manufacturing the low-EMI circuit board..
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Lee Sherman (Rancho Palos Verde CA) Mah Mark (San Jose CA), Method and apparatus for decoupling of unused power supply pins of a printed circuit board capable of operating at a plu.
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Evans James G. (Colts Neck NJ) Schneider Martin V. (Holmdel NJ) Wilson Robert W. (Holmdel NJ), Microstrip patch antennas with radiation control.
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Ohtaki Toru,JPX ; Ichida Yasuteru,JPX ; Takeuchi Yasushi,JPX, Multi-layered printed circuit board, and grid array package adopting the same.
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Sekine Syuichi (Chiba JPX) Maeda Tadahiko (Kanagawa JPX), Portable radio and telephones having notches therein.
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Tran Thanh T., Power distribution system for a multi-layer circuit board having a component layer, a ground layer, and an insulation l.
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Hatta Hironobu (Okazaki JPX), Printed circuit board for reducing noise.
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Shiotsu, Shinichi; Shiba, Akira, Printed circuit board including EMI reducing circuits, an information processing apparatus having the board and a method to select the circuits.
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Lockwood John J. ; Pavlu ; III Edward J., Printed circuit board including a terminated power plane and method of manufacturing the same.
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Morey Gilles,FRX, Reduced-radiation radio signal receivers.
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Schantz ; Jr. David L. (Ellicott City MD) Deoms James H. (Glen Arm MD) Smith Brian H. (Arnold MD), Three phase power bridge assembly.
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Frech Roland,DEX ; Klink Erich,DEX ; Shutler William F. ; Weiss Ulrich,DEX ; Winkel Thomas-Michael,DEX, Two-stage power noise filter with on and off chip capacitors.
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Ang Michael Anthony ; Taylor Alexander Dougald, Voltage regulator circuit for attenuating inductance-induced on-chip supply variations.
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이 특허를 인용한 특허 (5) 인용/피인용 타임라인 분석

Martin, Ronald, Board impedance management.
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Rostamzadeh, Cyrous; Wang, Shijie; Das, Rajesh; Gladstein, Steven; Foster, Timothy; Marecki, Allen; Master, Sanjai, Common mode noise suppression of switchmode power converters by capacitive shield with damping network.
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Kim, Han; Yoo, Je-Gwang; Ryu, Chang-Sup, Electromagnetic interference noise reduction board using electromagnetic bandgap structure.
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Gotou, Shigetada; Asao, Yoshihito, Multilayer printed wiring board.
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Wallash, Albert John, Shielded three-layer patterned ground structure.
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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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[미국특허] Printed circuit board including EMI reducing circuits, an information processing apparatus having the board and a method to select the circuits 원문보기