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1. 发明专利

JPS6237241A CONTROLLER FOR DC SUBSTATION 失效
公开(公告)号：JPS6237241A
公开(公告)日：1987-02-18
申请号：JP17655985
申请日：1985-08-10
申请人： MEIDENSHA ELECTRIC MFG CO LTD
发明人： KUWABARA KOICHI , SHIBUYA TADASHI
IPC分类号： H02M7/155 , B60M3/06 , H02M7/17 , H02M7/48
摘要： PURPOSE:To make improvements in regenerative efficiency, by limiting a circulating current from a rectifier to an inverter to the specified setting value irrespective of a power variation or the like, and lowering an inverter voltage as small as possible. CONSTITUTION:When a current of a rectifier 1 grows larger than a first setting value IS1, a voltage setting value of an inverter 2 is raised up to an upper limit allowable from the controlling standpoint, and a circulating current from the rectifier 1 to the inverter 2 is held down to the outmost. And, at the time of regeneration, since and inverter reference voltage setting value Vs is set to be somewhat higher than a no-load voltage of the rectifier 1 at the time of power rating, when the said circulating current tries to go beyond a second setting value IS2 (=IS1+DELTAI1), an inverter voltage is varied so as to cause the said current to become the first setting value IS1. And, if the circulating current is less than the second setting value IS2, it is unnecessary to alter the inverter setting voltage is particular, controlling it with AVR action of the inverter 2. Therefore, the circulating current is limited to the specified setting value irrespective of a power variation or the like, thus the inverter voltage is suppressible as low as possible.

2. 发明专利

JPH02135685A CONTROL OF HIGH-FREQUENCY POWER SUPPLY DEVICE 失效
公开(公告)号：JPH02135685A
公开(公告)日：1990-05-24
申请号：JP29074288
申请日：1988-11-17
申请人： MEIDENSHA ELECTRIC MFG CO LTD
发明人： KUWABARA KOICHI
IPC分类号： H05B6/06 , H02M7/48
摘要： PURPOSE:To simplify constitution by forming a DC power supply part of a diode bridge circuit for controlling an ON period of a switching element is parallel connected to a parallel resonance circuit. CONSTITUTION:A DC power supply part 10 is constituted by connecting a diode by bridging, and a current converted from an AC to a DC is fed to a parallel resonance circuit of a capacitor 4 and a reactor 5, whereto a load 6 is in parallel connected, through a DC reactor 2 and a blocking capacitor 3. On the other side, a switching element 7 in parallel connected to the parallel resonance circuit is controlled by a control circuit 11 to control supply voltage to the load 6. This oscillation frequency controls an ON period of the element 7 by the same circuit 11 with the resonance frequency of the parallel resonance circuit with the operation frequency less than 1/2 of the resonance frequency and the frequency is shifted from the resonance frequency so that supply voltage and control do not use a thyristor and such so as to simplify constitution. Further, the result is the same when operation frequency is multiplied by an integer to the resonance frequency and the ON period of the element 7 is controlled to 1/2 of the resonance frequency.

3. 发明专利

JPS6248258A DC BREAKER 失效
公开(公告)号：JPS6248258A
公开(公告)日：1987-03-02
申请号：JP18541485
申请日：1985-08-23
申请人： MEIDENSHA ELECTRIC MFG CO LTD
发明人： KUWABARA KOICHI , KOBAYASHI TADAO
IPC分类号： H02M3/135 , H02M3/125 , H03K17/73
摘要： PURPOSE:To enable a surge absorber to be organized with one unit and prevent overvoltage from being generated, by connecting a current balance reactor in series to a GTO thyristor, and by connecting a diode in parallel to the reactor. CONSTITUTION:In a DC breaker provided with a plurality of GTO thyristors 1 in parallel with each other, current balance reactors 3 are connected in series to the anode sides of the respective GTO thyristors 1. The anodes of respective diodes 4 are connected to the anodes of the GTO thyristors 1, and a common surge absorber element 2 is connected between the cathodes of the diodes 4 and the cathodes of the GTO thyristors 1. Besides, a diode 5 for circulating storage energy is connected between the cathodes of the diodes 4 and the other end sides of the reactors 3. By this method, regardless of the number of the thyristors 1, one surge absorber is enough.

4. 发明专利

JPH11177394A CHARGE DEVICE OF CAPACITOR 失效
公开(公告)号：JPH11177394A
公开(公告)日：1999-07-02
申请号：JP33622697
申请日：1997-12-08
申请人： MEIDENSHA ELECTRIC MFG CO LTD
发明人： KUWABARA KOICHI , KATAOKA YASUO
IPC分类号： H02M9/06 , H03K3/57
摘要： PROBLEM TO BE SOLVED: To provide a charge device of a capacitor that can attain miniaturization and lowering cost of the device without lowering charging precision. SOLUTION: A transformer 9A is made to be a transformer with one tap that can input outputs from both inverters to are primary winding wire and both inverters use main circuit switches S2 and S3 for both an initial charge and a fine adjustment charge by providing semiconductor switch circuits 21 and 22 that can circuitly separate the main circuit switches in accordance with an operation/stop. It is also included that synthesizing outputs from the both inverters by making the transformer have two primary winding wires, a construction where resonance current frequencies of both inverters are different from or coincident with each other, an independent operation or parallel operation construction and a construction made to be an opposite phase by the parallel operation.

5. 发明专利

JPH1052039A CAPACITOR CHARGING DEVICE 失效
公开(公告)号：JPH1052039A
公开(公告)日：1998-02-20
申请号：JP20138896
申请日：1996-07-31
申请人： MEIDENSHA ELECTRIC MFG CO LTD
发明人： AZUMA MASAO , KUWABARA KOICHI , SHIBUYA TADASHI
IPC分类号： H01S3/097 , H02J1/00 , H02M3/28 , H02M3/335 , H02M7/497 , H02M7/48
摘要： PROBLEM TO BE SOLVED: To reduce the number of components in a capacitor charging device. SOLUTION: A capacitor charging device includes an early-stage charging inverter INV1 and a fine adjusting inverter INV2 having each serial resonance circuit C1, C2, L1, and L2 for switching in accordance with each frequency, which is determined by these elements C1, C2, L1, and L2, a booster transformer T3 with two primary windings P1 and P2, to which the resonance output of the inverters INV1 and INV2 are fed, and a rectifier RF3 for rectifying the output of the booster transformer T3 and charging a load capacitor Co. In a conventional case, the resonance outputs of the inverters INV1 and INV2 are each boosted by using two booster transformers and rectified by two rectifiers. In this constitution, only one booster transformer T3 and one rectifier RF3 are used.

6. 发明专利

JPH0556046B2 失效
公开(公告)号：JPH0556046B2
公开(公告)日：1993-08-18
申请号：JP18541485
申请日：1985-08-23
申请人： MEIDENSHA ELECTRIC MFG CO LTD
发明人： KUWABARA KOICHI , KOBAYASHI TADAO
IPC分类号： H02M3/135 , H02M3/125 , H03K17/73

7. 发明专利

JPH11177393A CHARGE DEVICE OF CAPACITOR 失效
公开(公告)号：JPH11177393A
公开(公告)日：1999-07-02
申请号：JP33622597
申请日：1997-12-08
申请人： MEIDENSHA ELECTRIC MFG CO LTD
发明人： KUWABARA KOICHI , KATAOKA YASUO
IPC分类号： H02M9/06 , H03K3/55
摘要： PROBLEM TO BE SOLVED: To provide a charge device of a capacitor that secures switching control of an inverter even in case of a pulse width fluctuation or an erroneous operation of a monostatic multivibrator circuit. SOLUTION: A phase current of a switch S1 which on-controls by a gate voltage generated from a gate circuit is detected by a current transformer 23 and a phase current of a switch S2 is detected by a current transformer 26. When a gate voltage period from the gate circuit is shorter than the minimum allowed time T1 decided by a cycle of a resonance current, the gate voltage period is extended up to the allowed time T1 by the detected current of the current transformer 23. When the gate voltage period is longer than the maximum allowed time T2 decided by the cycle of the resonance current, a transistor 24, which is turned on by the detected current of the current transformer 26, is made to reduce the gate voltage period down to the allowed time T2 .

8. 发明专利

JPH07318610A MEASURING DEVICE OF SWITCHING LOSS 失效
公开(公告)号：JPH07318610A
公开(公告)日：1995-12-08
申请号：JP11322394
申请日：1994-05-27
申请人： MEIDENSHA ELECTRIC MFG CO LTD
发明人： KUWABARA KOICHI
IPC分类号： G01R31/26 , H02M1/00
摘要： PURPOSE:To measure a switching loss with high accuracy at a low cost. CONSTITUTION:A current Iin at a time of turn-on of GTO is detected by a current detection device 1, a voltage Vin is detected by a voltage detection device 2 and comparators 51 to 5100 having a multiple of detection ranges detect the current. One of the analog switches 61 to 6100 is controlled to be in an ON state in accordance with each detection output of the comparators, then the voltage Vin at that time is fetched so that each of operation resistors 71 to 7100 is set to a resistance value in accordance with the each detection range of the comparators. An integration circuit consists of an operational amplifier 8, a capacitor 9 and the operation resistors. An integration current proportional to the product of the current and voltage appears on the operation resistor via one of the analog switches in accordance with the current variation at a time of turn-on or turn-off of the GTO so that an output proportional to the switching loss is obtained from the operational amplifier.

9. 发明专利

JPS62117412A Dc gto breaker 失效
标题翻译： DC GTO断路器
公开(公告)号：JPS62117412A
公开(公告)日：1987-05-28
申请号：JP25738485
申请日：1985-11-16
申请人： Meidensha Electric Mfg Co Ltd
发明人： KUWABARA KOICHI
IPC分类号： H03K17/73
摘要： PURPOSE: To surely prevent breakdown of a GTO thyristor due to impression of a reverse voltage, by providing a means which breaks the on-gate current of the GTO thyristor upon detecting impression of the reverse voltage.
CONSTITUTION: When a regenerative reverse voltage from an electric motor vehicle 4 is impressed across a GTO thyristor 11 under a condition where a switch 13P is closed and an on-gate current is supplied to the thyristor 11 and the reverse voltage exceeds the Zener voltage of a Zener diode ZD, a transistor TR is turned on. When the transistor TR is turned on, an on-output is fetched to a photocoupler PC and a command means in a controller 14 breaks the on-gate current by opening the switch 13P by means of the on-output. Then the GTO thyristor 11 is forced to be turned off by impression of the reverse voltage produced when the on-gate current is broken and stops the reverse voltage under the turned-off condition. Thus an electric power loss caused by a reverse leaking current is eliminated.
COPYRIGHT: (C)1987,JPO&Japio
摘要翻译：目的：通过提供一种在检测到反向电压的印象时能够破坏GTO晶闸管的栅极电流的装置，确保防止由于反向电压的印象导致的GTO晶闸管的击穿。构成：当在开关13P闭合并且栅极电流被提供给晶闸管11并且反向电压超过齐纳二极管的齐纳电压的情况下，在电动机动车辆4的再生反向电压跨越GTO晶闸管11时，齐纳二极管ZD，晶体管TR导通。当晶体管TR导通时，导通输出被提取到光耦合器PC，并且控制器14中的命令装置通过导通输出打开开关13P而中断导通电流。然后，通过在栅极电流断开时产生的反向电压的印象强制关闭GTO晶闸管11，并且在关断状态下停止反向电压。因此，消除了由反向泄漏电流引起的电力损失。

10. 发明专利

JPH02136062A GATE CIRCUIT OF GATE TURN-OFF THYRISTOR 失效
公开(公告)号：JPH02136062A
公开(公告)日：1990-05-24
申请号：JP28835988
申请日：1988-11-15
申请人： MEIDENSHA ELECTRIC MFG CO LTD
发明人： KUWABARA KOICHI
IPC分类号： H02M1/06
摘要： PURPOSE:To improve cut-off capacity of a GTO by bringing OFF source voltage higher than the breakdown voltage of gate and producing OFF current with voltage higher than the breakdown voltage during accumulation time then applying capacitor voltage onto the gate after accumulation time thereby increasing dig/dt. CONSTITUTION:When a monostable operation circuit 12 produces an output at time (t1) based on a command fed from a logic section 2 and a switch 6 is turned ON under ON state of a GTO3, gate current (ig) flows through a capacitor 11, the switch 6 and the cathode and gate of the GTO3 to bring out a state where gate current flows easily because the OFF source 10 voltage is higher than the breakdown voltage of the gate thus providing a high dig/dt. Upon elapse of time T, output from the monostable operating circuit 12 disappears at time (t3) and the switch 6 is turned OFF. When the source 10 voltage is E and the resistances of resistors 13-15 are R1, R2, R3, a weak reverse voltage E.R1/(R1+R2+R3) is applied and the OFF state is maintained.

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