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21. 发明专利

JPS57129174A INVERTER CIRCUIT 失效
公开(公告)号：JPS57129174A
公开(公告)日：1982-08-11
申请号：JP1303581
申请日：1981-02-02
申请人： HITACHI LTD , HITACHI ENG CO LTD
发明人： UMETSU HIDEYASU
IPC分类号： H02M7/515
摘要： PURPOSE:To enhance the operation limit of an inverter to a theoretical value by connecting a commutation reactor in series with a commutation thyristor and magnetically connecting them. CONSTITUTION:In a pulse current commutation type inverter, a commutation reactor 4 is connected in series with commutation thyristors 2, 3 and is magnetically coupled. Even if the thyristors 2, 3 are in fired state, paired thyristors are fired in this manner, thereby forcibly applying reverse bias thereto, and effectively extinting the thyristors.

22. 发明专利

JPS57129171A STOPPING METHOD FOR INVERTER 失效
公开(公告)号：JPS57129171A
公开(公告)日：1982-08-11
申请号：JP1302781
申请日：1981-02-02
申请人： HITACHI LTD , HITACHI ENG CO LTD
发明人： UMETSU HIDEYASU
IPC分类号： H02M7/48
摘要： PURPOSE:To prevent the saturation of an inverter transformer by fully firing switching elements connected to the positive or negative sides of a DC power source of a bridge inverter when the inverter is stopped. CONSTITUTION:When an inverter is stopped, switching elements 1-4 connected to the positive or negative poles of the DC power source 7 of bridge inverter are fully fired. In this manner, the saturation of the inverter transformer when the inverter is stopped can be prevented, thereby preventing the DC shortcircuit of the inverter when the inverter is again started.

23. 发明专利

JPH0417434B2 失效
公开(公告)号：JPH0417434B2
公开(公告)日：1992-03-25
申请号：JP24154285
申请日：1985-10-30
申请人： NICHIREI KK , HITACHI SEISAKUSHO KK , HITACHI ENJINIARINGU KK
发明人： ISHIBASHI KENJI , HIDA KYOSHI , SUZUKI TSUTOMU , UMETSU HIDEYASU , NASU SEIJI
IPC分类号： G09B7/06 , G06F17/40

24. 发明专利

JPS5684208A AUTOMATIC PACKER 失效
公开(公告)号：JPS5684208A
公开(公告)日：1981-07-09
申请号：JP15298479
申请日：1979-11-28
申请人： HITACHI ENG CO LTD
发明人： UMETSU HIDEYASU , NISHI ICHIROU
IPC分类号： B65B9/06 , B65B51/10

25. 发明专利

JPS5658216A HIGH VOLTAGE POWER SOURCE DEVICE 失效
公开(公告)号：JPS5658216A
公开(公告)日：1981-05-21
申请号：JP13301179
申请日：1979-10-17
申请人： HITACHI ENG CO LTD
发明人： UMETSU HIDEYASU , ODAGIRI WATARU
IPC分类号： H01F30/00 , H01F30/10 , H01F31/00
摘要： PURPOSE:To enable to shorten the time necessary for the inspection and maintenance, etc., of a high voltage power source device being used for a dust precipitator, etc., by a method wherein an auxiliary power source is provided in a voltage equalizing cover installed on an insulator. CONSTITUTION:An auxiliary power source 3 for a high voltage power source is provided in a voltage equalizing cover 9 being installed on an insulator 7. An output terminal 5 from the voltage equalizing cover 9 and an output terminal 4 on an insulator 10 being provided on the cover 9 are provided respectively. By this way, leading out of the auxiliary power source 3 at the time of inspection, maintenance, and repair to be performed in the conventional manner becomes needless, and the time necessary for the inspection and maintenance can be shortened.

26. 发明专利

JPH10322883A POWER CONVERTER 失效
公开(公告)号：JPH10322883A
公开(公告)日：1998-12-04
申请号：JP6812998
申请日：1998-03-18
申请人： HITACHI LTD
发明人： KUNISADA HIDEAKI , SHIMADA KEIZO , UMETSU HIDEYASU
IPC分类号： G01R31/02 , H02H3/16 , H02H7/122 , H02M7/48 , H02M7/5387
摘要： PROBLEM TO BE SOLVED: To prevent overpotential at the output potential of an inverter by detecting a current flowing between an AC input power supply and the earth or a voltage between them thereby detecting the grounding state of the AC input power supply surely. SOLUTION: When the second phase of a single phase AC power supply 1 is grounded, a ground detection current ieu flows from the first phase of the single phase AC power supply 1 through a second phase loop of a resistor 34, a photocoupler 35, a diode 37, the earth, and the second phase of a single phase AC power supply 1 and a light receiving transistor in the photocoupler 35 is turned on. The ground detection current does not flow into a photocoupler 40 and the light receiving transistor thereof is turned off. Consequently, an overvoltage 15 not applied to a capacitor 29 in case of grounding or nongrounding of the second phase. In case of grounding of the first phase, and an alarm is generated for an apparatus where an inverter is operating in-phase an in synchronism with the AC input power supply and overpotential is prevented by modifying the grounding of the input power supply.

27. 发明专利

JPH10313574A POWER CONVERSION DEVICE AND PHASE-LOCKED CONTROL METHOD THEREFOR 失效
公开(公告)号：JPH10313574A
公开(公告)日：1998-11-24
申请号：JP11690597
申请日：1997-05-07
申请人： HITACHI LTD
发明人： SAKURAI YOSHIMI , KUBO KENJI , KANOUDA TAMAHIKO , UMETSU HIDEYASU , KUNISADA HIDEAKI , SHIMADA KEIZO
IPC分类号： G01R29/18 , H02M1/12 , H02M7/12 , H02M7/155
摘要： PROBLEM TO BE SOLVED: To swiftly synchronize a power conversion device after restoration of a commercial alternating-current power supply. SOLUTION: A phase-locked control circuit 10 exercises control and performs arithmetic operation in order to match the operating frequency of current commands of a power conversion device (converter) 3 which the frequency of an alternating-current power supply. In this phase-locked control circuit 10, the proportional and integral (PI) control operation system of a frequency control circuit 14 is changed by means of a switching signal from a circuit 13 which detects failure and restoration of the alternating-current power supply 1. When an anomaly of the power supply such as instantaneous power failure or power failure occurs, integrating operation is stopped. When the power supply is restored, the integrating operation is restarted. Since the operating frequency does not largely deviate during the period of an anomaly, the synchronization of the power conversion device with the commercial alternating-current power supply is realized in a short time after the power supply is restored. If the power conversion device 3 is a converter, as shown in the figure, operation with the power factor 1 of input current is swiftly achieved. If the power conversion device is an inverter, stable power is immediately supplied to a load.

28. 发明专利

JPH09135542A COMPUTER POWER SUPPLY SYSTEM CONTROLLING SYSTEM 失效
公开(公告)号：JPH09135542A
公开(公告)日：1997-05-20
申请号：JP28701895
申请日：1995-11-06
申请人： HITACHI LTD
发明人： TANIGUCHI YOSHIHIRO , UMETSU HIDEYASU
IPC分类号： G06F1/26 , G06F1/30 , H02J7/34 , H02J9/08
摘要： PROBLEM TO BE SOLVED: To make an unmanned operation possible by using a generator for one power supply out of a plurality of power supplies and a commercial power supply for the other one and incorporating a UPS operation instruction communication means which receives a UPS operation instruction from remote places. SOLUTION: When a commercial power supply is stopped by a power failure while a computer 1 is working, a UPS 2 supplies uninterruptive power to the computer 1 and the computer 1 obtains the information about the power failure of the commercial power supply 5 from a commercial power supply power failure communication means 11 and then a power selection instruction communication means 13 sends out to a switch 3 an instruction to select a generator as a power supply. Furthermore, the UPS 2 has a built-in UPS operation command communication means 21 which receives a UPS operation command from a remote equipment 6 and drives an inverter 22 and a converter 24 to supply power to the computer 1. By this method, a computer power system controlling system can be started up from a remote place and an unmanned operation can be possible.

29. 发明专利

JPH11225482A POWER CONVERTER 失效
公开(公告)号：JPH11225482A
公开(公告)日：1999-08-17
申请号：JP2295298
申请日：1998-02-04
申请人： HITACHI LTD
发明人： YAMAMOTO TAKAHIRO , SHIMADA KEIZO , KUNISADA HIDEAKI , UMETSU HIDEYASU
IPC分类号： H02M1/12 , H02M7/5387
摘要： PROBLEM TO BE SOLVED: To suppress noise to the outside to minimum with a path in which high frequency current flows, simplify a structure and facilitate assembly, by disposing a switching element, a DC capacitor, and an AC filter capacitor in an integral unit so as to form the shortest wiring. SOLUTION: The anode terminals 4 and the cathode terminals 5 of the switching elements S1, S2 of a semiconductor switching unit are connected in parallel to DC capacitors 1, 2, and an AC filter capacitor 3 is connected to the serially-connected part of the DC capacitors 1, 2. By connecting wiring between a high frequency reactor 11 and the unit by the identical bundle, and connecting it to the AC filter capacitor 3 in the unit using the shortest wiring, AC current I4 becomes current with a high frequency component removed, so that high frequency noise to the outside is decreased largely. It is thus possible to close the high frequency noise in the unit, which is effective to reduce radiation noise.

30. 发明专利

JPH10234183A VOLTAGE CONTROLLER FOR VOLTAGE-TYPE PWM INVERTER 失效
公开(公告)号：JPH10234183A
公开(公告)日：1998-09-02
申请号：JP3591397
申请日：1997-02-20
申请人： HITACHI LTD
发明人： KUBO KENJI , KANOUDA TAMAHIKO , SAKURAI YOSHIMI , UMETSU HIDEYASU , KUNISADA HIDEAKI , SHIMADA KEIZO
IPC分类号： H02M7/48
摘要： PROBLEM TO BE SOLVED: To prevent lowering of efficiency, due to the capacitor current of a LC filter in a voltage-type PWM inverter. SOLUTION: The capacitor current of an LC filter 14 is sample-held, in synchronization with the points of the positive and negative maximum amplitudes of a carrier-wave signal 34 for generating the PWM signals of a voltage-type PWM inverter. The instantaneous value of the capacitor current at the time of the present sampling is estimated from the previous sample hold value and the present sample hold value. Using the result of the estimation, capacitor current control is performed. Thus the instantaneous value of the fundamental wave component of the capacitor current can be detected by detecting the capacitor current, in synchronization with the point of the positive and negative maximum amplitudes of a carrier wave. For this reason, an effect, which is equivalent to filtering PWM components by a band rejection filter which is free from delay in detection, is produced.

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