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31. 发明专利

JP2001025178A UNINTERRUPTIBLE POWER UNIT 失效
公开(公告)号：JP2001025178A
公开(公告)日：2001-01-26
申请号：JP19416499
申请日：1999-07-08
申请人： HITACHI LTD
发明人： NOHARA MIKIYA , UEDA SHIGETA , UMETSU HIDEYASU , KANOUDA TAMAHIKO
IPC分类号： H02J9/06 , H02J3/32
摘要： PROBLEM TO BE SOLVED: To provide an uninterruptible power unit which transfers power between the first AC-DC converter 1 and the second DC-AC converter, and also can charge the storage battery stably, without the need for increasing the quantity of resistance to ripples of a DC capacitor or providing a reactor for prevention of discharge of the storage battery. SOLUTION: This is an uninterruptible power unit where a storage battery 3 and a DC capacitor 6 are connected in parallel to the DC side of the first AC-DC converter 1 and the second AC-DC converter 2, and normally a load 10 is supplied with AC power, and also a storage battery 3 is charged, and at power stoppage of the AC power source 9, the first AC-DC converter 1 converts the DC power of the storage battery 3 into AC power and supplies it to the load 10, and this is equipped with a means which detects and estimates instantaneous power of the first and second AC-DC converters, and controls the second AC-DC converter 2, so that the sum of an input voltage Vin from the AC power source 9 and the voltage on AC side of the second AC-DC converter 2 reaches a prescribed output voltage Vout, and controls the first AC-DC converter 1 to supply the instantaneous power outputted from the second AC-DC converter 2 and the instantaneous charge power to the storage battery 3.

32. 发明专利

JP2000236587A NON-POWER CUT POWER UNIT AND INFORMATION COMMUNICATION SYSTEM USING THE SAME 失效
公开(公告)号：JP2000236587A
公开(公告)日：2000-08-29
申请号：JP3816399
申请日：1999-02-17
申请人： HITACHI LTD
发明人： KANOUDA TAMAHIKO , ROKKAKU AKIRA , KUNISADA HIDEAKI , UMETSU HIDEYASU
IPC分类号： H02J9/00 , H04Q9/00
摘要： PROBLEM TO BE SOLVED: To manage a power unit for non-power cut by means of communication through the use of a power line and an information unit by providing a means communicating information with the power line as a route. SOLUTION: A power line transmission/reception means 10a is connected to UPS 1a and a signal is transported by using a frequency which is sufficiently higher than the frequency of a commercial AC power source 2. A signal inputted from the direction of a power plug 6a is received by a power cable 7a. The reception signal is transmitted to a control circuit 12 and the control circuit 12 analyzes the content of the signal. A control signal against UPS 1a is discriminated from a signal against the other device. In the case of the control signal against UPS 1a, the control circuit 12 controls UPS 1a. A computer 8a which is the load of UPS 1a and is a management object incorporates a power line transmission communication means 20a and the signal is transmitted by using the power line transmission communication means 20a. A computer 23a being a management source, and the computers 8a and 8b being the management objects and UPS 1a-c are connected by the power line transmission communication means 20a.

33. 发明专利

JP2000172350A UNINTERRUPTIBLE POWER SUPPLY UNIT AND ITS CONTROL METHOD 失效
公开(公告)号：JP2000172350A
公开(公告)日：2000-06-23
申请号：JP34822698
申请日：1998-12-08
申请人： HITACHI LTD
发明人： KANOUDA TAMAHIKO , KUNISADA HIDEAKI , UMETSU HIDEYASU
IPC分类号： G05F1/14 , G05F1/30 , H02M7/48
摘要： PROBLEM TO BE SOLVED: To provide an uninterruptible power supply unit whose loss is small and which is also inexpensive and controls an output voltage on a fixed level over a broad input voltage fluctuation range. SOLUTION: In this uninterruptible power supply unit which is provided with a transformer 7 provided with plural voltage switch coil taps and a tap switch device 5 switching the coil taps and maintains an output voltage on a fixed level by switching the tap switch device 5 in accordance with the input voltage of a commercial alternating current power supply, a 2nd transformer 6 serially connected to the transformer 7 is provided in a commercial alternating current power supply input side of the device 5, and also an inverter 12 which is connected to the secondary coil of the 2nd transformer 6 and adjusts small voltage fluctuations of the commercial power supply in the 2nd transformer 6.

34. 发明专利

JPH11332130A UNINTERRUPTIBLE POWER SUPPLY 失效
公开(公告)号：JPH11332130A
公开(公告)日：1999-11-30
申请号：JP13630798
申请日：1998-05-19
申请人： HITACHI LTD
发明人： MEGURO HIKARI , SHIMADA KEIZO , TANIGUCHI YOSHIHIRO , KUNISADA HIDEAKI , UMETSU HIDEYASU
IPC分类号： H02J7/34 , H02J9/00 , H02J9/06
摘要： PROBLEM TO BE SOLVED: To reduce positive and negative surge voltages generated at the output terminal of an UPS, without increasing the number of parts by equipping a charger with a means which is connected to the output terminal and rectifies the positive and negative voltages together, and a capacitor for smoothing the output of the rectifying means. SOLUTION: In an uninterruptible power supply, which converts a DC power of a battery into an AC power at the service interrupt and outputs it to an output terminal 4 to which a load is connected, the input terminal of a full-wave rectifier 31 capable of rectifying both the positive and negative voltages is connected to the output terminal 4 of the UPS, and a capacitor 10 connected in parallel to the output of the full-wave rectifier 31 and a regulator 11 which charges a battery 8 are connected. Consequently, the voltage of both terminals of the capacitor 10 becomes the maximum voltage of a first or second AC power. As a result of this, high surge voltages generated at the UPS output terminal 4 are absorbed by the capacitor 10 via the full-wave rectifier 31, and surge voltages are reduced. Accordingly, it becomes possible to have the performance of the UPS improved.

35. 发明专利

JPH11299129A UNINTERRUPTIBLE POWER SUPPLY SYSTEM CONNECTED IN PARALLEL WITH POWER SUPPLY 失效
公开(公告)号：JPH11299129A
公开(公告)日：1999-10-29
申请号：JP10731898
申请日：1998-04-17
申请人： HITACHI LTD
发明人： KANOUDA TAMAHIKO , KUBO KENJI , SAKURAI YOSHIMI , UMETSU HIDEYASU , KUNISADA HIDEAKI , TANIGUCHI YOSHIHIRO
IPC分类号： H02J9/06 , H02M3/155 , H02M7/12 , H02M7/219 , H02M7/48
摘要： PROBLEM TO BE SOLVED: To make it possible to significantly reduce the capacitance of a reactor placed between a commercial power supply and a load, by installing a switching means which allows a switching element for a voltage increasing/ decreasing chopper of half-bridge configuration and a switching element for an inverter to be connected in parallel. SOLUTION: When the input voltage effective value is under a rated voltage, a changer 12 is connected to 'A'. At this time, a switching element 13b operates as a step-down chopper circuit, and a storage battery 9 is charged from a voltage source formed in capacitors 14a, 14b. When the input voltage effective value is between quasi-overvoltage and overvoltage and between quasi-low voltage and low voltage, the changer 12 is connected to 'B', and switching elements 13a and 13c, 13b and 13d are parallel-connected to perform voltage compensation. When the input voltage effective value exceeds the overvoltage or falls below the low voltage, a relay 2 on the input side is turned off to fix the changer at 'A' and the switching element 13a is caused to perform chopping operation to discharge the storage battery 9.

36. 发明专利

JPH11215738A UNINTERRUPTIBLE POWER SUPPLY 失效
公开(公告)号：JPH11215738A
公开(公告)日：1999-08-06
申请号：JP1228698
申请日：1998-01-26
申请人： HITACHI LTD
发明人： KANOUDA TAMAHIKO , KUBO KENJI , TOKUNAGA KIICHI , SAKURAI YOSHIMI , UMETSU HIDEYASU , KUNISADA HIDEAKI , TANIGUCHI YOSHIHIRO
IPC分类号： H02J9/06
摘要： PROBLEM TO BE SOLVED: To reduce the load of an inverter of an uninterruptible power supply, when a commercial power supply system is normal by connecting its important load with a master output terminal having a stationary voltage compensating function and an active-filter function which are generated through the inverter, and by connecting its other loads with a bypass-output side. SOLUTION: When starting an uninterruptible power supply, an input-side relay 2 is opened, and switches 9a, 9b are both connected with a bypass-output 13 side not to connect an inverter 7 with any loads 5a-5d. When a commercial AC power supply 1 with a rated voltage and a stationary frequency is inputted, in a service-interrupt sensing circuit, the effective value of the input voltage is computed by an effective-value computing circuit to close the input-side relay 2. Also, the switch 9b is set to the bypass-output 13 side at it is. On the other hand, when starting the uninterruptible power supply, an inverter-fault sensing circuit starts its operation too. That, is the effective value of the output voltage of the inverter 7 is determined by an abnormal-voltage discriminating circuit, the presence of the abnormality of its gate signal is discriminated. Then, if there is no abnormality, the switch 9a is connected with an inverter-output 12 side.

37. 发明专利

JPH10146062A INVERTER OPERATING METHOD 失效
公开(公告)号：JPH10146062A
公开(公告)日：1998-05-29
申请号：JP29849196
申请日：1996-11-11
申请人： HITACHI LTD , HITACHI ENG CO LTD
发明人： KANOUDA TAMAHIKO , SAKURAI YOSHIMI , KUBO KENJI , UMETSU HIDEYASU , KUNISADA HIDEAKI , SHIMADA KEIZO , NAKANE TAKAYASU
IPC分类号： H02J9/06 , H02M7/48
摘要： PROBLEM TO BE SOLVED: To control generation of an over-current in the phase V when an inverter is started. SOLUTION: In the process to integrate the reference frequency command 10 with an integrator 11 and to produce a PWM signal with PWM signal generators 21a, 21b depending on such resulted integral calculation, an output of the integrator 11 is monitored with a starting phase detector 14 when the starting switch 13 turns ON, and a high level signal is outputted from the starting phase detector 14 when the phase of line voltage Vuv becomes 150deg. Moreover, an output of the latch circuit 23 is inverted to high level from low level and the switching elements 3a to 3d are caused to output the PWM signal from the AND circuits 22a, 20b to start the inverter circuit.

38. 发明专利

JPH09130977A SYSTEM LINKAGE SYSTEM CONTAINING DISPERSED POWER SUPPLY 失效
公开(公告)号：JPH09130977A
公开(公告)日：1997-05-16
申请号：JP28285495
申请日：1995-10-31
申请人： HITACHI LTD , HITACHI ENG CO LTD
发明人： SAKAI KEIJIRO , SAKURAI YOSHIMI , SUZUKI YASUAKI , UMETSU HIDEYASU , INAYAMA TSUTOMU
IPC分类号： H02J3/38 , H02M7/48 , H02M7/72 , H02N6/00
摘要： PROBLEM TO BE SOLVED: To easily input and output electric power by providing large-capacity batteries at a system side, a dispersed type power supply such as solar cells to each power user and also providing an AC power supply system, a DC power supply system and a communicating system between a plurality of power users and system power supplies for supplying AC or DC power. SOLUTION: AC power from a system power supply 1 is connected to an AC power supply system through a transformer 2. Also, the output of the transformer 2 is converted into DC by a PWM converter 3

39. 发明专利

JPH07336912A UNINTERRUPTIBLE POWER UNIT AND ITS CONTROL METHOD 失效
公开(公告)号：JPH07336912A
公开(公告)日：1995-12-22
申请号：JP15437294
申请日：1994-06-14
申请人： HITACHI LTD , HITACHI ENG CO LTD
发明人： SHIMADA KEIZO , KUNISADA HIDEAKI , UMETSU HIDEYASU
IPC分类号： H02J7/34 , H02J9/06 , H02M7/48
摘要： PURPOSE:To prevent the DC voltage after fluctuation from going out of the rating of a forward converter or an inverter even if disturbance occurs in the condition that a storage battery is cut off and causes the fluctuation of DC voltage. CONSTITUTION:When a breaker 6 is opened, and a storage battery 8 is cut off a DC transmission path 10, this is detected by an auxiliary contact 7, and a potential dividing resistor 19 is short-circuited by an analog switch 20. Hereby, reference voltage Vref drops from Vref1 to Vref2, whereupon the output voltage of a forward converter 2 drops, too. The reference voltage Vref 2 is set to reach such a value that the output voltage of the forward converter 2 drops to the vicinity of the center value of the rating of the forward converter 2 or the inverter 3.

40. 发明专利

JPS62102273A QUESTIONAIRE COLLECTOR 失效
公开(公告)号：JPS62102273A
公开(公告)日：1987-05-12
申请号：JP24154285
申请日：1985-10-30
申请人： NICHIREI KK , HITACHI LTD , HITACHI ENG CO LTD
发明人： ISHIBASHI KENJI , HIDA KIYOSHI , SUZUKI TSUTOMU , UMETSU HIDEYASU , NASU SEIJI
IPC分类号： G09B7/06 , G06F17/40

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