专利快速检索-快速检索全球专利，免费商用专利数据库-IPRDB

31. 发明专利

JPH06205506A POWER SOURCE FOR AC ELECTRIC RAILCAR 失效
公开(公告)号：JPH06205506A
公开(公告)日：1994-07-22
申请号：JP34841592
申请日：1992-12-28
申请人： MITSUBISHI ELECTRIC CORP
发明人： KAWAMOTO SHOICHI
IPC分类号： B60L3/00 , B60L9/24 , H02M7/12 , H02M7/17
摘要： PURPOSE:To prevent roughness loss of a chip of a switch due to a rush current by initially charging a smoothing capacitor to a peak value or more of a secondary winding voltage of a transformer for a short time. CONSTITUTION:An inverter 15 for converting a DC power to an AC power has a converter 5 for converting an AC output of a secondary winding 3b of a transformer 3 to a DC output to supply it via a smoothing capacitor 7, a charging resistor 8 for limiting an initial charging current of the capacitor 7 connected between the converter 5 and the winding 3b or the capacitor 7, and a switch 10 connected to the resistor 8 and to be closed when the capacitor 7 is initially charged completely. The converter 5 is operated at the time of initial charging of the capacitor 7 to be charged via the resistor 8.

32. 发明专利

JPH06165502A THYRISTOR PHASE CONTROL SYSTEM 失效
公开(公告)号：JPH06165502A
公开(公告)日：1994-06-10
申请号：JP33527892
申请日：1992-11-20
申请人： SHIBAURA ENG WORKS LTD
发明人： MATSUMOTO MITSUO , KIMURA TOYOJI , SATO OSAMU , MOTOKI TAKUYA
IPC分类号： H02M7/155 , H02M7/12 , H02M7/17
摘要： PURPOSE:To provide a thyristor phase control system controlling a thyristor Leonard device, etc., with high resolution, accuracy, and response without increasing the load of a microprocessor even when a plurality of thyristor bridge circuits are subjected to phase control. CONSTITUTION:A phase detector 31, an LPF 32, a VCO circuit 33, and a pulse generator 5 constitute a PLL circuit. A timer 51 counts a VCO output clock CLK, a comparator 52 detects coincidence of the counted value and the timer value which is set by a CPU 6, and a command decoder 55 outputs an interrupt request signal INT to the CPU 6. The CPU 6 sets a next control command to a command register 54 at each input of the interrupt request signal INT. A pulse PP obtained by dividing the clock CLK with a frequency-dividing ratio corresponding to the timer value which is set by the command decoder 55 or the CPU 6 is output to the phase detector 31 and is subjected to phase comparison with a power supply pulse ACP. A control angle alpha which is output to an SCR selection port 7 from the CPU 6 using a gate pulse GP is applied to the gates of corresponding SCR 11-16.

33. 发明专利

JPH05236680A 失效
公开(公告)号：JPH05236680A
公开(公告)日：1993-09-10
申请号：JP30412992
申请日：1992-11-13
申请人： IBM
发明人： RANDEIA SUINGU MARITSUKU
IPC分类号： G05F1/00 , H02J1/10 , H02J1/12 , H02J9/06 , H02M7/08 , H02M7/12 , H02M7/17
摘要： PURPOSE: To provide an N+1 power supply system for removing and replacing a defective converter, without interrupting the system. CONSTITUTION: A plurality of parallel-connected AC-DC converters 11, 13, 15 are provided. Output voltages of the converters 11, 13, 15 are sensed at power source side of decoupling diodes 17, 19, 21. Thus, the converters can be operated by characteristic sensing loop. At the time of removing the converters and replacing them with other converters, a feedback loop is not opened. The converters 11, 13, 15 are designed to be supplied with maximum power presets, irrespective of the changes of an AC line voltage. To limit the power, a control voltage is made inversely proportional to an AC line voltage at mean input. An output voltage of the converter is changed as a function of a load. Accordingly, all the parallel converters are always allowed to supply power to the load.

34. 发明专利

JPH05176460A SYSTEM LINKAGE UNIT 失效
公开(公告)号：JPH05176460A
公开(公告)日：1993-07-13
申请号：JP33920291
申请日：1991-12-24
申请人： TOSHIBA CORP
发明人： SEKI NAGATAKA
IPC分类号： H02J3/36 , H02M7/12 , H02M7/155 , H02M7/17
摘要： PURPOSE:To obtain a system linkage unit in which a separately excited linkage system employing a separately excited converter is combined with a self-excited linkage system employing a voltage type self-excited converter in order to complement mutual weak points while making the best use of the advantages of both systems. CONSTITUTION:When a separately excited linkage system 100 is continuously transmitting power from an AC system 1a to an AC system 1b, a self-excited linkage system 200 transmits active power while suppressing higher harmonies and/or reactive power generated from the separately excited linkage system 100. The separately excited linkage system 100 and the self-excited linkage system 200 normally operate independently but upon occurrence of DC short circuit in the self-excited linkage system 200, a coupling diode 107 is blocked and the separately excited linkage system 100 functions in series with the self-excited linkage system 200. Consequently, overcurrent on the self-excited linkage system 200 side is suppressed through constant current control function of the separately excited linkage system 100 thus opening the DC short circuit through the interrupting function of itself.

35. 发明专利

JPH04271281A POWER SUPPLY 失效
公开(公告)号：JPH04271281A
公开(公告)日：1992-09-28
申请号：JP5410791
申请日：1991-02-25
申请人： SANSHA ELECTRIC MFG CO LTD
发明人： ISHIMOTO HIROSHI , OHASHI MASAHIRO , ARAI TORU , NISHIO TAKASHI
IPC分类号： H02M7/155 , H02M7/12 , H02M7/17
摘要： PURPOSE:To produce a DC voltage having periodically changing polarity through a constitution comprising same components wherein the transformer is not changed in response to the AC power supply voltage (rated voltage) to be applied on the primary winding of the transformer. CONSTITUTION:The power supply comprises an AC control thyristor circuit 22 for limiting primary current disposed between an AC power supply and the primary winding 5 of a transformer 4, a thyristor rectifying circuit 14 comprising reverse parallel connection circuits 8-13 of positive rectification thyristor Sp and negative rectification thyristor Sn to be fired alternately and converting the outputs from the secondary windings 6, 7 of the transformer 4 into DC voltages having periodically changing polarities, and a controller 17 for controlling the firing phase of the AC control thyristor circuit 22 thus performing constant voltage control of the voltage to be applied on the primary winding 5.

36. 发明专利

JPH0429314B2 失效
公开(公告)号：JPH0429314B2
公开(公告)日：1992-05-18
申请号：JP1142583
申请日：1983-01-28
IPC分类号： H02M7/17 , H02M7/75 , H02M7/757 , H02P3/14

37. 发明专利

JPH03285566A DC POWER SOURCE 失效
公开(公告)号：JPH03285566A
公开(公告)日：1991-12-16
申请号：JP4003990
申请日：1990-02-21
申请人： FUJI ELECTRIC CO LTD
发明人： TOYOSHIMA NARIHISA
IPC分类号： H02M7/17 , H02M3/28
摘要： PURPOSE:To output a high DC voltage at the time of no load and a prescribed low DC voltage at the time of a steady-state operation by having a first trans former outputting the prescribed voltage at the time of the steady-state opera tion, a first rectifier rectifying the output thereof, a second transformer outputting the high voltage at the time of no load and a second rectifier rectify ing the output thereof. CONSTITUTION:A first rectifier 12 is connected to the output side of an inverter 2 and a first rectifier 12 is connected to the output side of this first transformer 11. The voltage regulation of the first transformer 11 is set at a small value. Besides, a second transformer 13 of which the winding ratio is set so that a higher voltage than an output voltage of the first transformer 11 be outputted at the time of no load is connected to the output side of the inverter 3, and moreover a second rectifier 14 is connected to the output side of the second transformer 13. The second rectifier 14 and the first rectifier 12 are connected together in parallel. DC currents outputted by these rectifiers 12 and 14 are supplied to a welder electrode part 8 after ripples thereof are absorbed and removed by a smoothing reactor 6 and a smoothing capacitor 7.

38. 发明专利

JPH03226273A POWER SUPPLY FOR DC ARC FURNACE 失效
公开(公告)号：JPH03226273A
公开(公告)日：1991-10-07
申请号：JP1848790
申请日：1990-01-29
申请人： NIPPON KOKAN KK , FUJI ELECTRIC CO LTD
发明人： AO NORIO , OKAZAKI KINZO , MOTOYOSHI OSAMU , KONISHI SHIGEO
IPC分类号： H02M7/00 , H02M7/12 , H02M7/17 , H02M7/19 , H05B7/148 , H05B7/20
摘要： PURPOSE:To prevent deterioration of power factor during steady operation and to reduce economical burden due to power factor improving facility by stopping a main converter and operating only an auxiliary converter when the arc current drops below a level which can be fed through the auxiliary converter. CONSTITUTION:Under steady state, both converters 3a, 3b bear the arc current with an arbitrary ratio. When physical state of a metal M to be melted or heated changes to lengthen the arc length thus increasing the voltage of a DC arc furnace 8, DC current decreases. When the DC current drops to a predetermined level and the main thyristor converter 3b is stopped, DC output voltage can be increased within the capacity of the auxiliary thyristor converter 3a having high voltage small current rating. Consequently, damping and interruption of arc current can be suppressed.

39. 发明专利

JPH0363310B2 失效
公开(公告)号：JPH0363310B2
公开(公告)日：1991-09-30
申请号：JP10138380
申请日：1980-07-25
申请人： WESTINGHOUSE ELECTRIC CORP
发明人： UIRIAMU ROBAATO KAPUTO
IPC分类号： B66B1/24 , B66B1/30 , H02M1/08 , H02M1/084 , H02M7/17 , H02P7/292

40. 发明专利

JPH0154954B2 失效
公开(公告)号：JPH0154954B2
公开(公告)日：1989-11-21
申请号：JP7159983
申请日：1983-04-20
申请人： MITSUBISHI ELECTRIC CORP
发明人： ASAEDA TAKEAKI , TONO SHIGENORI , MATSURA TOSHIAKI , SHIROCHI SHINJI
IPC分类号： H02M7/10 , H02M7/17 , H02M7/19 , H02P23/00 , H02P23/26

你已经成功收藏专利！

检索式保存成功!

IPRDB

热门服务

关于我们

友情链接

联系方式