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31. 发明专利

JPH0556644A CONTROL METHOD OF BYPASS PAIR OF THYRISTOR BRIDGE 失效
公开(公告)号：JPH0556644A
公开(公告)日：1993-03-05
申请号：JP21362391
申请日：1991-08-26
申请人： TOSHIBA CORP
发明人： ITO KATSURO
IPC分类号： H02M1/00 , H02M7/12 , H02M7/155
摘要： PURPOSE:To provide the control method of the bypass pair of a thyristor bridge capable of positively inserting a thyristor valve into the bypass pair even when the BPP control of one system gets trouble when a control system is doubled. CONSTITUTION:The bypass pair of a thyristor bridge is controlled in such a manner that a phase control signal from the control panel 4B of the other system is locked by a gate pulse generator when a function emitting a bypass pair command signal to the gate pulse generator is provided and the bypass pair command signal is output only from the control panel 4A of one system in the control panels of double systems when a bypass pair state is brought for stopping the protection of a thyristor in the thyristor bridge controlling the ignition timing of the thyristor by the doubled control panels 4A, 4B.

32. 发明专利

JPS62293935A DC MULTITERMINAL TRANSMISSION 失效
公开(公告)号：JPS62293935A
公开(公告)日：1987-12-21
申请号：JP13370886
申请日：1986-06-11
申请人： TOSHIBA CORP
发明人： ITO KATSURO
IPC分类号： H02J1/00

33. 发明专利

JPS62104429A DC TRANSMISSION 失效
公开(公告)号：JPS62104429A
公开(公告)日：1987-05-14
申请号：JP24040685
申请日：1985-10-29
申请人： TOSHIBA CORP
发明人： ITO KATSURO , INOGUCHI HARUHISA
IPC分类号： H02J1/00 , H02M1/00

34. 发明专利

JPS6258832A DC MULTI-TERMINAL TRANSMISSION SYSTEM 失效
公开(公告)号：JPS6258832A
公开(公告)日：1987-03-14
申请号：JP19484785
申请日：1985-09-05
申请人： TOSHIBA CORP
发明人： ITO KATSURO
IPC分类号： H02J1/00

35. 发明专利

JPS61262077A PROTECTING DEVICE FOR SEMICONDUCTOR ELEMENT 失效
公开(公告)号：JPS61262077A
公开(公告)日：1986-11-20
申请号：JP10040685
申请日：1985-05-14
申请人： TOSHIBA CORP
发明人： ITO KATSURO , TAKAHASHI TADASHI
IPC分类号： H02M1/06 , H02M1/088
摘要： PURPOSE:To prevent a GTO from damaging due to an overvoltage by providing forward voltage detectors at respective GTOs, applying an OFF gate signal, and then applying an ON gate to all the GTOs when an unbalance occurs in sharing the voltage. CONSTITUTION:In a circuit in which semiconductor elements (GTO)1a, 1b having a plurality of self-extinguishing ability are connected in series or series-parallel, forward voltage detecting means are connected with the GTOs 1a, 1b. The detecting means may employ light emitting diodes 5a, 5b, 13a, 13b. After an OFF gate signal (b) is applied, the forward voltage of the GTOs 1a, 1b are detected after the prescribed time. When the forward voltage is detected any of the GTOs, an ON gate signal (a) is immediately applied to turn all the GTOs ON. Thus, even if an extinguishing impossibility occurs, it can prevent the elements from damaging.

36. 发明专利

JPH10337029A THYRISTOR CONVERTER 失效
公开(公告)号：JPH10337029A
公开(公告)日：1998-12-18
申请号：JP13629497
申请日：1997-05-27
申请人： TOSHIBA CORP
发明人： ITO KATSURO
IPC分类号： H02H7/12 , H02M7/12 , H02M7/155 , H02M7/162
摘要： PROBLEM TO BE SOLVED: To prevent damage to a thyristor, if a forward voltage has been applied only to the arm of a thyristor valve failed in turning-off, by giving a gate pulse and turning it on. SOLUTION: At the same time with the turning-off of a thyristor valve 2v, an arm short circuit occurs to the thyristor valve 2u, if a faulty current exceeds a detection level of a level detector 8, it is outputted as a gate block signal GB2 from a control protection equipment 5 to a gate pulse generator device 4, and resets a flip-flop 11 via OR circuit 19 and OR circuit 13. Thereafter, a failure current is cut off once, and if a period from the application of a reverse voltage to the application of a forward voltage to the thyristor valve 2v is longer than a set point T1 at on-delay 15, then the output of on-delay 15 becomes 1, so that the flip-flop 12 is reset. Thus, even though a voltage is applied to the thyristor valve 2v and a FV signal is detected at that point in time, no gate pulse is outputted and the thyristor valve 2v becomes a turn-off state.

37. 发明专利

JPH07231646A COMMUTATION-FAILURE PROTECTIVE CIRCUIT 失效
公开(公告)号：JPH07231646A
公开(公告)日：1995-08-29
申请号：JP2020194
申请日：1994-02-17
申请人： TOSHIBA CORP
发明人： ITO KATSURO
IPC分类号： H02M1/00 , H02M7/12 , H02M7/155 , H02M7/515
摘要： PURPOSE:To detect a commutation failure promptly and prevent later duplicated failures in a thyristor converter, by advancing an ignition phase to a given advanced phase on the basis of an output signal supplied from a commutation- failure detecting circuit when there are no marginal angles at a thyristor valve. CONSTITUTION:When a thyristor valve 13 does not open and a commutation failure takes place though a continuity-term signal (b) from a control circuit 14 becomes zero, an output signal (h) from an AND circuit 20, which receives a signal (e) and an output signal (g) from a one-shot pulse generator circuit 19, remains still zero. When an output (k) from an on-delay circuit 22 becomes 1, a commutation-failure protective signal as an output of the AND circuit 20 becomes also 1. By using the commutation-failure protective signal as a phase advancing signal in ignition phases of a thyristor converter 1, the phase is advanced much sooner than a conventional case, and therefore the duplicated commutation failures can be prevented.

38. 发明专利

JPH0759256A PROTECTOR FOR THYRISTOR VALVE 失效
公开(公告)号：JPH0759256A
公开(公告)日：1995-03-03
申请号：JP20490593
申请日：1993-08-19
申请人： TOSHIBA CORP
发明人： ITO KATSURO
IPC分类号： H02H7/12 , H02M1/00 , H02M1/092 , H03K17/082 , H03K17/10 , H03K17/79
摘要： PURPOSE:To protect a thyristor against damage due to a surge voltage by comparing the rising rate of forward applying voltage with the turn OFF time of the thyristor when the surge voltage intrudes after turn OFF and delivering protective pulses to all thyristors thereby preventing failure of partial commutation. CONSTITUTION:Upon intrusion of a surge voltage, the forward voltage increases steeply during a reverse voltage interval and the intervals of t1, t2 are shortened. Consequently, the output (d) from a signal generating circuit 33 is higher than the output (c) from an adder circuit 32 even at time T2 when the reverse voltage becomes VR1. Consequently, the output (e) from a comparator 34 is sustained at '0' and a flip-flop 35 is not reset. When a forward voltage is applied to a thyristor 1, an FV signal '1' is produced and the output from an AND circuit 37 goes '1' to drive LEDs 40-1-40-N thus firing all thyristors. This constitution prevents failure of partial commutation and protects the thyristor against damage due to surge voltage.

39. 发明专利

JPH04344171A PULSE GENERATOR 失效
公开(公告)号：JPH04344171A
公开(公告)日：1992-11-30
申请号：JP11493391
申请日：1991-05-20
申请人： TOSHIBA CORP
发明人： ITO KATSURO
IPC分类号： H02M7/155 , H02M7/12 , H02M7/162 , H03K17/78
摘要： PURPOSE:To obtain such a pulse generator that can surely prevent the generation of an unsuitable gate pulse when the output of the AVR of one system of a double PG system drops and, in addition, can safely stop a system without generating any overvoltage even when the output of the AVR of the operated PG system drops when only the PG system is operated. CONSTITUTION:In the case the level detection circuit 11A of one of the first and second pulse generators 5A and 5B starts to operate when the other pulse generator does not operate normally, a signal for requesting to stop system protection is sent to a control board 4 without stopping the generation of an optical gate pulse. The first and second power failure compensation circuits 8A and 8B have power supply capacities which are sufficient to enable the pulse generators 5A and 5B to normally operate during the period until a system is stopped for protection after the first and second level detection circuits 11A and 11B start to operate.

40. 发明专利

JPH0421353A METHOD FOR PROTECTING THYRISTOR VALVE 失效
公开(公告)号：JPH0421353A
公开(公告)日：1992-01-24
申请号：JP12118790
申请日：1990-05-14
申请人： TOSHIBA CORP
发明人： TAKAHASHI TADASHI , ITO KATSURO
IPC分类号： H02M1/00 , H02M1/092 , H03K17/082
摘要： PURPOSE:To prevent the breakage of a thyristor by an overvoltage by forcibly giving arc signals to all thyristors when the overvoltage is generated during a prescribed period after the completion of a energizing period. CONSTITUTION:Optical signals detected by forward voltage detection circuits 61, ...6I, ...6N are converted into electric signals C1, ...CI, ...CN at a photoreceptor circuit 9A. An optical overvoltage signal detected by an overvoltage detecting resistance 7 and overvoltage detection circuit 8 is converted into an overvoltage signal (d) at another photoreceptor circuit 9B. A signal processing circuit 10 produces output signals C10, ...CI0, ...CN0 when a forward voltage signal becomes zero. The C0 output of an OR circuit 11A is inputted to another OR circuit 11B together with the forward voltage signal C0 and an OR output (f) is produced. By using a protecting period signal (e) produced from a protecting period decision circuit 12 and the signal (f), a protective arcing signal (g) is produced at an AND circuit 13 and supplied to all thyristors 11, ...1I, ...1N through a gate pulse generation circuit 14 and light guides 41, ...4I, ...4N.

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