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1. 发明专利

JPH0458755A THYRISTOR CONVERTER 失效
公开(公告)号：JPH0458755A
公开(公告)日：1992-02-25
申请号：JP16570990
申请日：1990-06-26
申请人： TOKYO ELECTRIC POWER CO , TOSHIBA CORP
发明人： HORIUCHI SUSUMU , SHIRAI YOSHINORI , ITO KATSURO
IPC分类号： H02M7/155 , H02M1/00 , H02M7/12
摘要： PURPOSE:To protect elements against breakdown due to repeated VBO firing with an oscillating current caused by the stray capacitance in the main circuit of a thyristor valve and the reactance of main circuit and a steep forward voltage to be produced immediately thereafter by selecting the constants of a snubber circuit and an anode reactor such that no intermittent current is produced. CONSTITUTION:Capacitance Cn (not shown) of snubber capacitors 16-1-16-N and the resistance Rn (not shown) of snubber resistors 7-1-7-N are set in increase the discharge current of a snubber circuit and to increase the discharge time constant. Furthermore, inductance La (not shown) of an anode reactor 18 is increased and the peak value of discharge current of stray capacitor 21 is suppressed in order to prevent production of an intermittent current from VBO free optical thyristors 6-1-6-N immediately after VBO firing thus disabling turn OFF and preventing application of forward voltage. Consequently, continuous VBO firing can be avoided and the elements can be protected from breakdown due to a forward voltage produced immediately after a short reverse voltage interval.

2. 发明专利

JPH02174553A ELECTROSTATIC INDUCTION THYRISTER CONVERTER 失效
公开(公告)号：JPH02174553A
公开(公告)日：1990-07-05
申请号：JP32977488
申请日：1988-12-27
申请人： TOKYO ELECTRIC POWER CO , TOSHIBA CORP
发明人： TOKIWA YUKIO , ICHIKAWA FUMITOSHI , ITO KATSURO
IPC分类号： H02M1/00
摘要： PURPOSE:To prevent shortcircuit fault upon throw-in of main circuit by throwing a main circuit circuit breaker in based on an AND condition of an output signal from a circuit for judging application of reverse bias voltage more than a predetermined times and a main circuit circuit breaker throw-in command signal. CONSTITUTION:LEDs 18a, 18b emit light normally because of reverse bias voltage higher than a predetermined level, and optical signals are fed to photoe lectric converters 9a, 9b where the optical signals are converted into reverse bias signals which is then fed to a judging circuit 19. Since all reverse bias signals are normally '1', output from the judging circuit 19 is '1'. Upon provi sion of a main circuit breaker throw-in command, an AND gate 20 produces '1' output because the output signal from the judging circuit 19 is '1' and the circuit breaker throw-in command is fed to a circuit breaker 23 thus throw ing in the circuit breaker 23. By such arrangement, shortcircuit fault can be prevented upon application of voltage onto the main circuit.

3. 发明专利

JPH01235413A ABNORMALITY DETECTION CIRCUIT FOR ELECTROSTATIC INDUCTION THYRISTOR CIRCUIT 失效
公开(公告)号：JPH01235413A
公开(公告)日：1989-09-20
申请号：JP6025788
申请日：1988-03-16
申请人： TOKYO ELECTRIC POWER CO , TOSHIBA CORP
发明人： TOKIWA YUKIO , ICHIKAWA FUMITOSHI , ITO KATSURO
IPC分类号： H03K17/73 , H03K17/00
摘要： PURPOSE:To easily and securely detect the abnormality of an off gate circuit and the fault of a thyristor circuit itself at low cost and to operate a protection circuit by providing an exclusive OR circuit of an off gate command signal and the output signal of a voltage detection circuit. CONSTITUTION:The voltage detection circuit 12 which detects that a voltage between the gate G of the electrostatic induction thyristor 1 and a cathode K is below a reference voltage is provided, the exclusive OR circuit 18 takes the exclusive OR of a voltage detection signal (b) being the output of the voltage detection circuit 12 and an off pulse signal (a), and the output is set to a fault signal (d), whereby the protection circuit 20 executes an appropriate protection action when the fault signal (d) shows '1'. Thus, the bias voltage monitor of the electrostatic induction thyristor 1 and the fault of the thyristor itself can be realized by the simple circuit and at low cost, and the protection circuit 20 can be operated.

4. 发明专利

JPH04200265A THYRISTOR CONVERTER 失效
公开(公告)号：JPH04200265A
公开(公告)日：1992-07-21
申请号：JP33308590
申请日：1990-11-29
申请人： TOKYO ELECTRIC POWER CO , TOSHIBA CORP
发明人： HORIUCHI SUSUMU , ITO KATSURO , KAWASAKI KENICHI
IPC分类号： H02J1/00 , H02M1/00 , H02M7/04 , H02M7/155
摘要： PURPOSE:To prevent destruction of a VBO-free optical thyristor by continuing an optical gate signal given to the VBO-free optical thyristor during the period till its current interruption, generated by a vibratory current, disappears. CONSTITUTION:When VBO-free optical thyristors 6-1 to 6-N are VBO-ignited, a VBO firing signal (e) becomes 1 by actuating a VBO firing detecting circuit 18. This signal is input to a monomulti-vibrator circuit 16, which then produces a pulse E having duration long enough to suppress a high frequency vibratory current, generated by VBO firing, below a main circuit current. By inputting this pulse E to an OR circuit 17, a gate signal (f) of length T1 is generated to give an optical gate pulse to the VBO-free optical thyristors 6-1 to 6-N. In this way, all the VBO-free optical thyristors 6-1 to 6-N can be ignited immediately when forward voltage is applied.

5. 发明专利

JPH02124631A SEMICONDUCTOR CONVERTER 失效
公开(公告)号：JPH02124631A
公开(公告)日：1990-05-11
申请号：JP27793288
申请日：1988-11-02
申请人： TOKYO ELECTRIC POWER CO , TOSHIBA CORP
发明人： TOKIWA YUKIO , ICHIKAWA FUMITOSHI , ITO KATSURO
IPC分类号： H02M1/08 , H03K17/73
摘要： PURPOSE:To start a converter even is the converter consists of a normally-on semiconductor element by connecting a voltage division circuit in parallel with a component of a series connection circuit and applying a reverse bias voltage between a gate and a cathode of the element at the cathode terminal of the series connection circuit. CONSTITUTION:When a voltage is started to be applied to a main circuit, since an SI thyristor 81 is turned off, a potential difference is caused between the anode and the cathode of the SI thyristor 81, an electric energy is supplied to a power supply circuit 41 through a DC voltage sharing resistor 31, and power is supplied to a photoelectric conversion circuit 51 and an amplifier circuit 61 from the power supply circuit 41. In this case, a reverse bias voltage is supplied between the gate and cathode of a thyristor 82, which is turned off, and a potential difference is caused between the anode and cathode of the thyristor 82 and power is supplied from a power supply circuit 42 to a photoelectric conversion circuit 52 and an amplifier circuit 62. Thus, the power is supplied to all photoelectric conversion circuit 51-5n and amplifier circuits 61-6n in this way and the thyristor converter is driven by having only to supply the gate signal.

6. 发明专利

JPH0386080A CONVERTER 失效
公开(公告)号：JPH0386080A
公开(公告)日：1991-04-11
申请号：JP22268989
申请日：1989-08-29
申请人： TOKYO ELECTRIC POWER CO , TOSHIBA CORP
发明人： TOKIWA YUKIO , ICHIKAWA FUMITOSHI , ITO KATSURO
IPC分类号： H02J3/38 , H02M7/48 , H02M7/493
摘要： PURPOSE:To reduce the capacity of a filter by providing first, second transformers having series connection of secondary windings, a circuit for controlling the output voltage of a first voltage type converter to a rectangular wave, and a circuit for PWM-controlling a second voltage type converter in order to set the composite output voltage of the secondary windings to a sine wave. CONSTITUTION:A second voltage type converter 3B is so PWM-controlled that series composite voltage waveform of the output voltage of rectangular wave of a first voltage type converter 3A and the output voltage of the second converter through the secondary windings of first and second transformers 5A, 5B becomes a sine wave. A filter 6 may absorb harmonic wave current of high order of the converter 3B since the output currents of the converters 3A, 3B become sine waves. Thus, the capacity of the filter 6 can be reduced.

7. 发明专利

JPH0389843A CONVERTER 失效
公开(公告)号：JPH0389843A
公开(公告)日：1991-04-15
申请号：JP22330789
申请日：1989-08-31
申请人： TOKYO ELECTRIC POWER CO , TOSHIBA CORP
发明人： HORIUCHI SUSUMU , SHIRAI YOSHINORI , ITO KATSURO
IPC分类号： H02M7/155 , H02M1/092 , H02M7/12
摘要： PURPOSE:To prevent a VBO free thyrister from being damaged by thermal cause by detecting that the VBO ignition has occurred a specified number of times or more during a specified period, and giving an ignition pulse to a VBO free thyrister each time the forward voltage of the VBO free thyrister is detected. CONSTITUTION:When a thyrister valve 1 has VBO-ignited a specified number of times continuously, the output of a VBO ignition detecting means 16 becomes '1', and a one shot circuit 17 turns the output to '1' during a specified period. Accordingly, during the period when the output of the one shot circuit 17 is '1', if forward voltage is applied to a thyristor valve 1, immediately a photogate pulse is given to a VBO free thyrister 5. And, it follows that the VBO free thyrister 5 is turned off before the voltage rises up to VBO ignition level, and can be saved from igniting continuously.

8. 发明专利

JPH03195367A THYRISTOR CONVERTER EQUIPMENT 失效
公开(公告)号：JPH03195367A
公开(公告)日：1991-08-26
申请号：JP33449989
申请日：1989-12-22
申请人： TOKYO ELECTRIC POWER CO , TOSHIBA CORP
发明人： HORIUCHI SUSUMU , SHIRAI YOSHINORI , ITO KATSURO
IPC分类号： H02H7/10 , H02H7/12 , H02M1/00 , H02M7/12 , H02M7/155
摘要： PURPOSE:To detect VBO ignition easily and effect protection positively by a method wherein a gate pulse is provided at a time point when a forward voltage is impressed on a thyristor when non-energizing period of time becomes shorter than a predetermined value. CONSTITUTION:After VBO ignition, a forward voltage OR signal (b) and a backward voltage OR signal (h) become zero, the output (f) of a NOR circuit 23, the output (k) of an AND circuit 27 and the output (l) of a VBO voltage detecting circuit 20 become 1 whereby the VBO ignition is detected. Next, when a thyristor bulb it turned off and a forward voltage is impressed, the output of another AND circuit 14 becomes 1 (one), a gate pulse (d) is generated, VBO free light thyristors 6-1 to 6-N are provided with an optical gate pulse to ignite all of the VBO free light thyristors whereby protection may be effected.

9. 发明专利

JPH02174562A VOLTAGE TYPE CONVERTER 失效
公开(公告)号：JPH02174562A
公开(公告)日：1990-07-05
申请号：JP32977388
申请日：1988-12-27
申请人： TOKYO ELECTRIC POWER CO , TOSHIBA CORP
发明人： TOKIWA YUKIO , ICHIKAWA FUMITOSHI , ITO KATSURO
IPC分类号： H02H7/122 , H02M7/493
摘要： PURPOSE:To protect a semi-conductor element from breakdown by magnetically coupling first and second conductors connected each other with reverse polarity and operating converters in phase at high and low potential sides. CONSTITUTION:First conductor 12 connecting between one end of a high potential side capacitor having the other end connected with positive pole and the negative pole of the high potential side converter 9 is magnetically coupled with second conductor 13 connecting between one end of a low potential side capacitor 5 having the other end connected with the negative pole of the low potential side converter 10 and the positive polarity of the low potential side converter 10, where the high potential side converter 9 and the low potential side converter 10 are operated in phase. The conductors 12, 13 function as normal connecting conductors during steady operation. If trouble occurs, the capacitors 2, 5 are discharged through the conductors 12, 13, and the conductors 12, 13 function as reactors and suppress di/dt of discharge current.

10. 发明专利

JP2005065453A Frequency converter 有权
标题翻译：频率转换器
公开(公告)号：JP2005065453A
公开(公告)日：2005-03-10
申请号：JP2003295002
申请日：2003-08-19
申请人： Toshiba Corp , 株式会社東芝
发明人： ITO KATSURO
IPC分类号： H02M7/17 , H02M7/48 , H02M7/493
摘要： PROBLEM TO BE SOLVED: To provide a frequency converter that can stably be operated without intermitting the current even under a lightly loaded condition. SOLUTION: The output side of the first converter composed of a forward conversion part 1-1, a DC reactor 2-1 and a reverse conversion part 3-1, and the output side of the second converter composed of a forward conversion part 3-1, a DC reactor 2-2 and a reverse conversion part 3-2 are connected in the vicinity of a connecting point of a capacitor 4b of a load 4. Only one of the two converters is operated until an output current of the frequency converter exceeds a prescribed value, and the other makes the reverse conversion part on standby in a bypass pair state. When the output current exceeds the prescribed value, both the tow converters are parallel-operated, thereby allowing the converter to be operated without intermitting the current even under the light load condition. COPYRIGHT: (C)2005,JPO&NCIPI
摘要翻译：要解决的问题：提供即使在轻负载状态下也能够在不间断电流的情况下稳定地操作的变频器。解决方案：由正向转换部分1-1，直流电抗器2-1和反向转换部分3-1组成的第一转换器的输出侧和由正向转换器构成的第二转换器的输出侧部分3-1，直流电抗器2-2和反向转换部分3-2在负载4的电容器4b的连接点附近连接。只有两个转换器之一运行直到输出电流变频器超过规定值，另一方使反向转换部处于旁路对状态的待机状态。当输出电流超过规定值时，两个转换器都是并联运行的，从而即使在轻负载条件下也能够使转换器工作而不中断电流。版权所有（C）2005，JPO＆NCIPI

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