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71. 发明专利

JPH09140154A INVERTER PROTECTOR 失效
公开(公告)号：JPH09140154A
公开(公告)日：1997-05-27
申请号：JP29708695
申请日：1995-11-15
申请人： HITACHI LTD , HITACHI KEIYO ENG
发明人： TAKADA NAOKI , NAKAMURA ATSUHIKO , TOKASHIKI MUTSUO , IBORI SATOSHI , TOMITA HIROYUKI , SHIMOMUKAI KAZUTO , ITO KAZUHIRO , HIROTA MASAYUKI
IPC分类号： H02H3/05 , H02H7/12 , H02M1/00 , H02M7/48 , H02P27/06 , H02P7/63
摘要： PROBLEM TO BE SOLVED: To prevent the thermal breakdown of the main circuit semiconductor device of an inverter which is caused by the heat accumulation when the output frequency of the inverter is a very low frequency including DC. SOLUTION: A monitoring circuit 14 which receives a signal ω1 expressing the output frequency fout of an inverter and a signal just expressing the output current I of the inverter and, provided that the output frequency fout is not higher than a predetermined frequency fa which is several Hz, generates a protective operation signal S after a lapse of time (t) which is determined by the output current I of the inverter and a protective switch 15 which opens a contact when the protective operation signal S is supplied are provided. The operation of a main circuit semiconductor device of which a reverse conversion unit in an inverter main circuit 1 is stopped for protection by opening the protective switch 15. The thermal breakdown of a main circuit semiconductor device can be securely avoided even in an inverter such as a vector control type inverter or a sensorless vector control type inverter in which the slip frequency correction is performed.

72. 发明专利

JPH09135088A ELECTRIC APPARATUS 失效
公开(公告)号：JPH09135088A
公开(公告)日：1997-05-20
申请号：JP28890895
申请日：1995-11-07
申请人： HITACHI LTD , HITACHI KEIYO ENG
发明人： HIROTA MASAYUKI , TOKASHIKI MUTSUO , IBORI SATOSHI , TAKADA NAOKI , ITO KAZUHIRO , SHIMOMUKAI KAZUTO , FUJISHIRO AKIRA
IPC分类号： H05K7/12 , H02M3/00 , H02M7/04 , H02M7/48
摘要： PROBLEM TO BE SOLVED: To provide an electric apparatus which can immediately mount a part easily and reliably to the accurate position without providing a particular jig for the positioning. SOLUTION: An extending portion 11 which overlaps with a part fitting surface 2a of a heat radiating fin 2 as the second member is provided to a plate member 1 for part fitting as the first member and positioning of a semiconductor element 3 as the part to be mounted to the heat radiating fin 2 can be done by the apertures 12, 13 provided to this extending portion 11. Thereby, since the part can be mounted easily and accurately as in the case of using a jig, assembling manhours can be reduced and workability can also be improved, resulting in cost reduction.

73. 发明专利

JPH08308244A ABNORMALITY DISCRIMINATING METHOD FOR POWER CONVERTER 失效
公开(公告)号：JPH08308244A
公开(公告)日：1996-11-22
申请号：JP15477295
申请日：1995-06-21
申请人： HITACHI LTD , HITACHI KEIYO ENG
发明人： ITO KAZUHIRO , IBORI SATOSHI , TOKASHIKI MUTSUO , TAKADA NAOKI , KOSONE TAKAMICHI , HIROTA MASAYUKI
IPC分类号： H02M1/00 , H02M7/48
摘要： PURPOSE: To identify and discriminate the abnormality of a switching element according to the specific and abnormal states of the element in which the abnormality occurs by including the short-circuit of a load. CONSTITUTION: An on pulse is supplied from a gate driver 14 to the switching elements 1 to 6 of an inverter according to the signal on of an abnormality discriminator 16, they are sequentially conducted in a short time according to a plurality of predetermined combination patterns, and the type of the abnormality can be discriminated based on the change of the current detected from current detectors 9, 10 in response to the conduction combination patterns of the elements. Thus, since the type of the abnormality can be discriminated, the cause of the abnormality can be easily, accurately analyzed in a short time.

74. 发明专利

JPH0817496A TERMINAL BOARD WITH AUXILIARY BULKHEAD 失效
公开(公告)号：JPH0817496A
公开(公告)日：1996-01-19
申请号：JP15079494
申请日：1994-07-01
申请人： HITACHI LTD , HITACHI KEIYO ENG
发明人： HIROTA MASAYUKI , YAMAMOTO TOSHIHIKO , TOKASHIKI MUTSUO , IBORI SATOSHI , SHIMOZU TADAO
IPC分类号： H01R9/22
摘要： PURPOSE:To prolong the insulating length of each terminal board of multi- electrode, single piece structure simply and certainly by mounting an aux. bulkhead by the use of part of the terminal board. CONSTITUTION:A conductor 6 is inserted to each terminal board of a thin terminal board of insulating material embodied in a multi-electrode, single piece structure. If an aux. bulkhead 8 having a channel-shaped section made of an insulating material is fixed to the terminal board, its insulating length can be prolonged simply and certainly to allow it to work well with a longer lead 6. Further such bulkheads 8 may be mounted on every other terminal boards, whereby the arrangement can work well with set terminal boards of multi-electrode, single piece structure and a terminal board can be obtained at low costs including the managerial man-hours and the working man-hours for installation.

75. 发明专利

JPH0670593A CONTROLLING METHOD FOR OPERATION OF INDUCTION MOTOR 失效
公开(公告)号：JPH0670593A
公开(公告)日：1994-03-11
申请号：JP17812693
申请日：1993-07-19
申请人： HITACHI LTD , HITACHI KEIYO ENG
发明人： IBORI SATOSHI , SHIMOZU TADAO , YABU MASATOMO
IPC分类号： H02P1/28 , H02P27/06 , H02P7/63
摘要： PURPOSE:To smoothly restart by detecting presence/absence of the residual voltage of a primary side terminal of an induction motor at the time of restarting and zero-soft starting the motor at the time of detecting absence of the residual voltage. CONSTITUTION:When an instantaneous power interruption occurs, a detector 13 detects it to inform it to a controller 14. The controller 14 informs of no application of AC 3-phase powers and interrupts the output of a driving circuit 15 for an inverter 2. If a residual voltage exists at the time of recovery of the interruption, it is restarted through circuits 6-9. That is, a frequency is calculated, set, and it is soft-started. If the residual voltage is zero, circuits 10, 11 are operated, an induction motor(IM) 3 is operated under predetermined conditions. That is, so the interruption of the output is released, and it is operated so as to become a predetermined voltage, a predetermined frequency. After a predetermined time, its output is again interrupted, and after a predetermined time, the residual voltage is further detected, and if it is not zero, it is soft- started.

76. 发明专利

JPH0564549B2 失效
公开(公告)号：JPH0564549B2
公开(公告)日：1993-09-14
申请号：JP15452782
申请日：1982-09-07
申请人： HITACHI LTD
发明人： NINOMYA JUICHI , IBORI SATOSHI , NAGASE HIROSHI , IGARASHI SADAYUKI , SUGAI HIROSHI
IPC分类号： H02M7/48

77. 发明专利

JPH0552136B2 失效
公开(公告)号：JPH0552136B2
公开(公告)日：1993-08-04
申请号：JP12506685
申请日：1985-06-11
申请人： HITACHI LTD
发明人： IBORI SATOSHI , SHIMOZU TADAO , HATSUTORI MOTONOBU
IPC分类号： H02M7/48

78. 发明专利

JPH05184182A INVERTER CONTROLLER 失效
公开(公告)号：JPH05184182A
公开(公告)日：1993-07-23
申请号：JP131992
申请日：1992-01-08
申请人： HITACHI LTD
发明人： YAMAMURA HIROHISA , NAOI KEIGO , OBARA SANSHIRO , MASAKI RYOZO , IBORI SATOSHI
IPC分类号： B60L9/18 , H02M7/48 , H02P27/06 , H02P27/08
摘要： PURPOSE:To perform high-efficiency operation at low load by reducing the carrier frequency, according to car velocity and load, and calm the noise at high load by raising carrier frequency, in the controller of an inverter for an electric rolling stock. CONSTITUTION:An induction motor 15 is driven by performing voltage type PWM control with an inverter 12 through an input filter 19 from a battery 18. A microcomputer 1 operates a speed command value by the revolution N of a motor, and further operates a vector, and outputs three-phase current command value, and ACRs 4, 5, and 6 outputs sine wave voltage command values by the deviation from the actual current value of the motor 15. So, PWMs 9, 10, and 11 generate control signals, comparing the output value of a triangular wave oscillator OSC3 with a sine wave voltage command value, and turns on or turns off IGBT through a gate driver 20. What is more, a logic circuit 2 judges the difference of load condition by a motor current 10 and motor revolution N, and changes the cycle of OSC3, and performs optimum operation from both aspects of efficiency and noise.

79. 发明专利

JPH04299097A MOTOR CONTROLLER 失效
公开(公告)号：JPH04299097A
公开(公告)日：1992-10-22
申请号：JP9678591
申请日：1991-04-26
申请人： HITACHI LTD
发明人： MATSUMOTO OSAMU , IBORI SATOSHI , KANBARA KOJI , NAGATO YUICHIRO
IPC分类号： H02P27/06
摘要： PURPOSE:To protect a main switching element or a motor against circulation current by providing an OFF control means for temporarily turning OFF conducting main switching elements at same timing thereby blocking the circulation current from growing. CONSTITUTION:A mode detecting means 10 for detecting a regenerative mode is provided and when the means 10 detects a regenerative mode, a signal notifying the regenerative mode is delivered to an OFF control means 11. Consequently, a binary signal generating circuit 113 has an output lower than the maximum output of a saw-tooth wave generating circuit 112 and a comparator 114 outputs a pulse signal. Logic circuits 108, 110 then interrupt base signals of main switching elements Q1, Q2. Since the output from the OFF control means 11 functions commonly on a circuit producing the base signals for other main switching elements Q3-Q6, all main switching elements Q1-Q6 are temporarily turned OFF at same timing.

80. 发明专利

JPH02155477A PROTECTIVE DEVICE FOR POWER CONVERTER 失效
公开(公告)号：JPH02155477A
公开(公告)日：1990-06-14
申请号：JP30048088
申请日：1988-11-30
申请人： HITACHI LTD
发明人： IBORI SATOSHI , BABA SHIGEYUKI , FUJII HIROSHI , KANBARA KOJI
IPC分类号： H02H7/122 , H02M7/48
摘要： PURPOSE:To increase the resistance value of a resistor for current limit charging, and to improve a current limiting effect while avoiding wasteful power consumption at the time of operation by installing an electromagnetic contactor in parallel with the resistor for current limit charging and providing a means controlling the opening and closing of the electromagnetic contactor. CONSTITUTION:An electromagnetic contactor 6 is mounted in parallel with a resistor 5 for current limit charging, and the opening and closing of the electromagnetic contactor 6 are controlled by a control circuit 9. The control circuit 9 transmits a control signal over the electromagnetic contactor 6 so that the electromagnetic contactor 6 is brought to an open state until the terminal voltage of a smoothing capacitor 3 reaches fixed voltage and the electromagnetic contactor 6 is closed when the terminal voltage reaches fixed voltage. Consequently, since currents are made to flow through the smoothing capacitor 3 through the resistor 5 for current limit charging when a power supply is connected or when the power supply is turned ON, excess inrush currents are not made to flow through the smoothing capacitor 3. Accordingly, an expensive circuit element such as a switching element is not broken.

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