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1. 发明专利

CA2010571C POWER TRANSMISSION AND DISTRIBUTION DIGITAL PROTECTION SYSTEM 未知
公开(公告)号：CA2010571C
公开(公告)日：1994-04-26
申请号：CA2010571
申请日：1990-02-21
申请人： HITACHI LTD
发明人： CHIBA TOMIO , KIDO MITSUYASU , KUDO HIROYUKI , KAWAKAMI JUNZO , YAMANAKA YOSHIKAZU , YOKOYAMA KAZUYUKI , MATSUYAMA TAKAKAZU , KAWAI TADAO , MORI SHIGERU
IPC分类号： H02H3/02 , H02H3/00 , H02H3/05 , H02J3/00 , H02J3/18 , G06F15/16
摘要： A power signal processing system high in expandability and versatility is disclosed, in which a signal representing the conditions of a power system is taken in and subjected to digital computation processing, and a signal is produced for protecting or controlling the power system on the basis of the computation result. The power signal processing system comprises a plurality of processing units for executing a series of processing, from signal input to signal output based on the computation result in divided fashion in accordance with the processing functions. A system control unit has a function of controlling the units to assure sequential data transfer therebetween according to the divided processing functions, thereby standardizing the power signal processing system.

2. 发明专利

DE69028225T2 未知
公开(公告)号：DE69028225T2
公开(公告)日：1997-02-27
申请号：DE69028225
申请日：1990-02-21
申请人： HITACHI LTD
发明人： CHIBA TOMIO , KIDO MITSUYASU , KUDO HIROYUKI , KAWAKAMI JUNZO , YAMANAKA YOSHIKAZU , YOKOYAMA KAZUYUKI , MATSUYAMA TAKAKAZU , KAWAI TADAO , MORI SHIGERU
IPC分类号： H02H3/02 , H02H3/00 , H02H3/05 , H02J3/00 , H02J3/18
摘要： A power signal processing system high in expandability and versatility is disclosed, in which a signal representing the conditions of a power system is taken in and subjected to digital computation processing, and a signal is produced for protecting or controlling the power system on the basis of the computation result. The power signal processing system comprises a plurality of processing units (2, 3, 4, 5, 6, 7, 8, 9) for executing a series of processings from signal input to signal output based on the computation result in divided fashion in accordance with the processing functions. A system control unit (1) has a function of controlling the units to assure sequential data transfer therebetween according to the divided processing functions, thereby standardizing the power signal processing system.

3. 发明专利

DE69028225D1 未知
公开(公告)号：DE69028225D1
公开(公告)日：1996-10-02
申请号：DE69028225
申请日：1990-02-21
申请人： HITACHI LTD
发明人： CHIBA TOMIO , KIDO MITSUYASU , KUDO HIROYUKI , KAWAKAMI JUNZO , YAMANAKA YOSHIKAZU , YOKOYAMA KAZUYUKI , MATSUYAMA TAKAKAZU , KAWAI TADAO , MORI SHIGERU
IPC分类号： H02H3/02 , H02H3/00 , H02H3/05 , H02J3/00 , H02J3/18
摘要： A power signal processing system high in expandability and versatility is disclosed, in which a signal representing the conditions of a power system is taken in and subjected to digital computation processing, and a signal is produced for protecting or controlling the power system on the basis of the computation result. The power signal processing system comprises a plurality of processing units (2, 3, 4, 5, 6, 7, 8, 9) for executing a series of processings from signal input to signal output based on the computation result in divided fashion in accordance with the processing functions. A system control unit (1) has a function of controlling the units to assure sequential data transfer therebetween according to the divided processing functions, thereby standardizing the power signal processing system.

4. 发明专利

JPH11164218A TELEVISION SIGNAL RECEIVER 失效
公开(公告)号：JPH11164218A
公开(公告)日：1999-06-18
申请号：JP32413997
申请日：1997-11-26
申请人： HITACHI LTD
发明人： IGARASHI YUTAKA , MIZUKAMI HIROYUKI , YOKOYAMA KAZUYUKI
IPC分类号： H04N5/44
摘要： PROBLEM TO BE SOLVED: To provide a receiver in which intermediate frequencies are selectable. SOLUTION: A control circuit 140 controls PLL circuits 120, 130 based on a signal received by a channel selection signal input terminal 150. The PLL circuit 120 controls an oscillated frequency of a 1st local oscillator 100 and selects a characteristic of an input filter 20 so as to allow it to pass through a desired signal. The PLL circuit 130 controls an oscillated frequency of a 2nd local oscillator 110 and selects a pass band of a 1st intermediate frequency IF filter 50 to include a desired IF. Thus, a 2nd IF amplifier 80 is varied by varying the pass band of the 1st IF filter 50 in this way.

5. 发明专利

JPH02223329A SIGNAL PROCESSING SYSTEM 失效
公开(公告)号：JPH02223329A
公开(公告)日：1990-09-05
申请号：JP4250189
申请日：1989-02-22
申请人： HITACHI LTD
发明人： CHIBA TOMIO , KIDO MITSUYASU , KUDO HIROYUKI , KAWAKAMI JUNZO , YAMANAKA GIICHI , YOKOYAMA KAZUYUKI , MATSUYAMA TAKAKAZU , KAWAI TADAO , MORI SHIGERU
IPC分类号： H02H3/02 , H02H3/00 , H02H3/05 , H02J3/00 , H02J3/18
摘要： PURPOSE:To standardize a system by providing a plurality of units to divide and execute the processing of a signal based on the processing function and by controlling the data transfer between these units so that it can be executed one after another in each processing function divided by a system control unit. CONSTITUTION:A processing function with respect to the protection or control of a power system can be materialized by properly selecting and combining a system control unit 1, an analogue input unit 2, a relay arithmetic unit 3, a sequence processing unit 4, a setting and indicating unit 5, a digital in- and output unit 6 and an accident detection unit 7. Moreover, since the data transfer between units to 7 is controlled by the system control unit 1, it could be enough to connect necessary number of units 1 to 7 for necessary function only by setting the transfer control by the system control unit 1 corresponding to the said system. The system can thereby be standardized.

6. 发明专利

JPS5431559A TROIDAL COIL 失效
公开(公告)号：JPS5431559A
公开(公告)日：1979-03-08
申请号：JP9696477
申请日：1977-08-15
申请人： HITACHI LTD
发明人： YOKOYAMA KAZUYUKI
IPC分类号： H01F27/26 , H01F17/06

7. 发明专利

JP2001008127A TELEVISION SIGNAL RECEIVER 失效
公开(公告)号：JP2001008127A
公开(公告)日：2001-01-12
申请号：JP17628599
申请日：1999-06-23
申请人： HITACHI LTD , HITACHI MEDIA ELECTRON KK
发明人： IGARASHI YUTAKA , YOKOYAMA KAZUYUKI
IPC分类号： H04N5/46
摘要： PROBLEM TO BE SOLVED: To obtain a receiver allowed to correspond to a change in broadcasting formats and reduced at its device cost and development cost. SOLUTION: Satellite, CATV and ground wave broadcasting signals are respectively converted into digital signals through respective tuners 20, 120, 220 and inputted to a programmable gate array 410. A CPU 510 connected to an external storage device 520 such as an HDD executes a change in the circuit data of the gate array 410 and its control and controls also respective tuners 20, 120, 220.

8. 发明专利

JP2000112963A ELECTRONIC INFORMATION READING DEVICE 失效
公开(公告)号：JP2000112963A
公开(公告)日：2000-04-21
申请号：JP27959898
申请日：1998-10-01
申请人： HITACHI LTD , HITACHI MEDIA ELECTRON KK
发明人： IGARASHI YUTAKA , UEYAMA MAYUMI , YOKOYAMA KAZUYUKI , SATO TOMOTAKE
IPC分类号： G06F13/00 , G06F17/30 , H04M11/08
摘要： PROBLEM TO BE SOLVED: To provide an electronic information reading device reading plural pieces of electronic information. SOLUTION: An electronic information data processing part 400 incorporates a large capacity media drive 410 and a large capacity storage device 420, and it is connected to a data broadcasting reception tuner 200 and a telephone line 30. Information data are accumulated in the large capacity storage device 420. A periodically purchased information title logo 110 and a non-purchase information title logo 130 are displayed on a display device 100. All purchased information are retrieved and the articles of a desired genre are collected. A content can be generated and a new book can be generated.

9. 发明专利

JPS5556480A MULTIIPHASE RECTIFIER CIRCUIT 失效
公开(公告)号：JPS5556480A
公开(公告)日：1980-04-25
申请号：JP12848978
申请日：1978-10-20
申请人： HITACHI LTD
发明人： YOKOYAMA KAZUYUKI , YOSHIZAKI ATSUHIRO
IPC分类号： H02M7/08 , H02M7/04 , H02M7/06
摘要： PURPOSE:To prevent malfunctioning of the subsequent circuit section by eliminating the overlapping of noise component on the output of the rectifier through grounding of the secondary coil centertap of the transformer. CONSTITUTION:A capacitor 2 and a resistance connected in series to each other are connected between output terminals A and C of the secondary coil of a transformer 1 to shift the secondary output of the transformer for converting the single phase AC input to a given level to 2-phase output. A load 10 is fed with the rectification output of rectifiers 4-7 for full-wave rectification of voltage VC across terminals of the capacitor 2 and the rectification output obtained from a rectifying system which is adapted to invert negative current flowing through rectifiers 4 and 6 with an amplifier 13 using as the reference the potential through the circuit grounding for the second coil center point B of the transformer. The subsequent circuit section 20 works by receiving voltage across the terminals of the load 10.

10. 发明专利

JP2004297633A Antenna duplexer and radio terminal using it 有权
公开(公告)号：JP2004297633A
公开(公告)日：2004-10-21
申请号：JP2003089540
申请日：2003-03-28
申请人： Hitachi Ltd , Hitachi Media Electoronics Co Ltd , 株式会社日立メディアエレクトロニクス , 株式会社日立製作所
发明人： HIKITA MITSUTAKA , SHIBAGAKI NOBUHIKO , MATSUDA SHIGEKI , MATSUURA NAOKI , YOKOYAMA KAZUYUKI
IPC分类号： H01P1/15 , H04B1/44
摘要： PROBLEM TO BE SOLVED: To provide a very effective technology for a GSM (global system for mobile communications) radio terminal which realizes multiband compatibility with a small circuit configuration and high performance, and whose future demand will further increase.
SOLUTION: This multiband switching antenna duplexer is applied to a mobile telephone used for a TDMA (time division multiple access) system such as a GSM, and a single antenna is shared by signals of four different frequency bands (GSM850, EGSM (extended GSM), DCS (digital communication system), and PCS (personal communication service)). By combining receiving filters 24, 27, 44, and 47 with switching devices of diodes 9, 10, 11, and 12; the antenna duplexer can switch bands with very high performance by the minimum number of switching devices. By this antennal duplexer's circuit, not only a multiband switching antenna duplexer is miniaturized, but also a radio terminal itself is improved in performance and miniaturized.
COPYRIGHT: (C)2005,JPO&NCIPI

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