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71. 发明专利

JPS6427310A SEMICONDUCTOR SWITCH DEVICE 失效
公开(公告)号：JPS6427310A
公开(公告)日：1989-01-30
申请号：JP18414887
申请日：1987-07-22
申请人： MITSUBISHI ELECTRIC CORP
发明人： ASAEDA TAKEAKI
IPC分类号： H03K17/64 , H03K17/56 , H03K17/567
摘要： PURPOSE:To ensure the operation even when a load current is small by connecting a voltage limit circuit comprising a diode, a resistor and a capacitor between the source of a MOSFET and a tap provided to the secondary side of a current transformer so as to make a reset voltage of the current transformer applicable. CONSTITUTION:The voltage limit circuit 20 being the series connection of a parallel circuit comprising a diode 21 and a resister 22 and a parallel circuit comprising a Zener diode 23 and a capacitor 24 is connected between the tap provided to the secondary side of the current transformer 30 and the source of the MOSFET 2. Moreover, a diode 25 whose anode is connected to the base of a transistor(TR) is connected between the base of the bipolar TR 1 and a connecting midpoint being the connection of the said two parallel circuits. Thus, a reset voltage generated at the secondary side of the current transformer 30 at the turn-off of the semiconductor switch is limited to charge the part of the reset voltage in excess of the limit voltage to the capacitor 24. The charged voltage is applied to the semiconductor switch via the part of secondary side of the current transformer 30 at the turn-on of the semiconductor switch. Thus, the reset of the current transformer 30 is ensured. Furthermore, the semiconductor switch is surely turned on.

72. 发明专利

JPS645359A POWER CONVERTER 失效
公开(公告)号：JPS645359A
公开(公告)日：1989-01-10
申请号：JP15832387
申请日：1987-06-25
申请人： MITSUBISHI ELECTRIC CORP
发明人： ASAEDA TAKEAKI
IPC分类号： H02M5/458 , H02M7/06 , H02M7/08 , H02M7/12 , H02M7/48
摘要： PURPOSE:To reduce a harmonic current by parallel connecting two-stage cascade connected inverters to the DC output side of first diode rectifiers and by providing three-phase AC switches and second diode rectifiers. CONSTITUTION:The AC ends of three-phase bridge connected first diode rectifiers 10 of a power converter are connected to a three-phase AC power and inverters 5 are connected the DC ends of said diode rectifiers via reactors 2. The output of said inverters is prallel connected in a common homopolarity manner via insulating transformers 6 and second diode rectifiers 7 and connected a capacitor 8. Also, three-phase AC switches 20 are connected between the interconnecting point of said inverters 5 and the three-phase AC power. Thus, said three-phase AC power is rectified into three-phase half-wave rectification waveforms and controlled it waveform by both inverters 5P-5N divided into positive and negative groups, respectively. Then, the DC current difference of said first diode rectifiers 10 is controlled via the three-phase AC switches 20 to flow to the AC power.

73. 发明专利

JPS63202271A POWER CONVERTER 失效
公开(公告)号：JPS63202271A
公开(公告)日：1988-08-22
申请号：JP3353487
申请日：1987-02-18
申请人： MITSUBISHI ELECTRIC CORP
发明人： ASAEDA TAKEAKI
IPC分类号： H02M7/10 , H02M7/06 , H02M7/12 , H02M7/155 , H02M7/217 , H02M7/25
摘要： PURPOSE:To increase the power factor of a power converter to substantially 1 by providing a bidirectional conduction type 3-phase AC switch between the intermediate point of a stepup chopper and a 3-phase AC power source connected in parallel, and providing a voltage controller and a current controller. CONSTITUTION:A power converter consists of 3-phase bridge-connected diode rectifiers 10, reactors 2P, 2N respectively connected to the positive, negative output terminals, DC switches 3P, 3N, diodes 4P, 4N, and capacitors 5P, 5N, and a load 6 is energized from both ends of the capacitors 5P, 5N. Stepup choppers 8P, 8N made of reactors 2, etc., are provided together with a 3-phase AC switch 7, and the intermediate connecting point O of the switches 3P, 3N is connected to a 3-phase AC power source (eU + eW). Thus, the current references of both positive and negative stepup choppers are calculated from AC power source current reference, the output current is waveform-controlled by a current controller, and the difference of P- and N-side DC currents is so controlled as to supply it through the switch 7 to the AC power source.

74. 发明专利

JPS63133885A CONTROLLER FOR AC MOTOR 失效
公开(公告)号：JPS63133885A
公开(公告)日：1988-06-06
申请号：JP28006486
申请日：1986-11-25
申请人： MITSUBISHI ELECTRIC CORP
发明人： SHIROCHI SHINJI , ASAEDA TAKEAKI
IPC分类号： H02P27/04 , H02P6/06 , H02P6/08 , H02P6/28 , H02P6/32 , H02P21/00 , H02P21/04 , H02P21/22 , H02P23/03 , H02P23/16 , H02P23/18
摘要： PURPOSE:To obtain a sufficient output from an AC motor by so controlling the amplitude of a terminal voltage as to obtain a predetermined commutation marginal angle thereby to prevent the terminal voltage and the power factor from varying due to a load variation, thereby stably performing the commutation. CONSTITUTION:The phase angle phi of an armature current Ia for the terminal voltage V of a motor 3 is instructed by a power factor angle command circuit 18. The terminal voltage V0 of the motor 3 at the time of no load is instructed by a noload terminal voltage command circuit 19. The commands of the circuits 18, 19 and the current Ia are input to a vector calculator 20, which outputs a field current command Ifp and a phase command beta of a second converter 2. The conduction phase angle of a second power converter 2 is controlled by a phase controller 34 on the basis of the commands from a position detector 4 and the calculator 20.

75. 发明专利

JPS62230368A INVERTER 失效
公开(公告)号：JPS62230368A
公开(公告)日：1987-10-09
申请号：JP7277486
申请日：1986-03-31
申请人： MITSUBISHI ELECTRIC CORP
发明人： ASAEDA TAKEAKI
IPC分类号： H02M7/48 , H02M7/521
摘要： PURPOSE:To feed back energy quickly and positively by mounting a capacitor for recovering energy to a discharge path for a snubber capacitor and feeding back the stored energy of the capacitor for recover ing energy to a DC power supply through a flyback type converter. CONSTITUTION:A capacitor 8 recovering the energy of snubber capacitors 41U, 41X is fitted to the common discharge path of the snubber capacitors 41U, 41X for snubber circuits 4U, 4X. The stored energy of the capacitor 8 is fed back to a DC power supply by a flyback type covnerter 9 conducting high-frequency switching operation. The flyback type converter 9 is constituted of a GTO 9A, a choke coil 9B and a diode 9C.

76. 发明专利

JPS61258673A CIRCULATING CURRENT CONTROLLING METHOD OF BIDIRECTIONAL POWER CONVERTER 失效
公开(公告)号：JPS61258673A
公开(公告)日：1986-11-17
申请号：JP9851285
申请日：1985-05-07
申请人： MITSUBISHI ELECTRIC CORP
发明人： ASAEDA TAKEAKI
IPC分类号： G05F1/70 , H02M5/27
摘要： PURPOSE:To improve the control performance by correcting the phase input of a converter with a voltage drop corresponding value due to a load current of a DC reactor, thereby non-interfering the load current with respect to a circulating current. CONSTITUTION:A circulating current type cycloconverter CC has positive and negative group converters SS-P and SS-N, and energizes through DC reactors LP, LN a load LOAD. The circulating current is flowed between positive and negative group converters SS through a DC reactor L, and controlled by an error signal epsilonc. In this case, DC reactors LP1, LN1 and LP2, LN2 which are not magnetically coupled are used as the reactor L. A noninterference unit 10 is formed of a compensator 11, a polarity discriminator 13 and a switch circuit 13 having switches SWP, SWN, and a voltage compensation signal is fed to adders A3, A4. Thus, a voltage drop by the load current of the reactor L is compensated, and the circulating current is not affected by the load current.

77. 发明专利

JPS6117213B2 JPS6117213B2 - 失效
公开(公告)号：JPS6117213B2
公开(公告)日：1986-05-06
申请号：JP13598278
申请日：1978-10-31
申请人： Mitsubishi Electric Corp
发明人： ASAEDA TAKEAKI
IPC分类号： H02H7/122

78. 发明专利

JPS60162485A INVERTER 失效
公开(公告)号：JPS60162485A
公开(公告)日：1985-08-24
申请号：JP1855484
申请日：1984-02-02
申请人： MITSUBISHI ELECTRIC CORP
发明人： YUYA TAKASHI , ASAEDA TAKEAKI
IPC分类号： H02M7/48 , H02M7/521
摘要： PURPOSE:To reduce the charging voltage vibration of a snubber capacitor by feeding back the snubber enerby fed back to a power source through a resistor for the initial certain period and then shortcircuiting the resistor. CONSTITUTION:An inverter with a self-arc-extinguishing switching element 1 is formed by connecting in series reactors 2 between the elements 1 and in parallel with the elements 1 a feedback diode 3 and a snubber 4. Further a diode rectifier 7 is provided, and the discharging current of the capacitor 41 of the snubber 4 is fed back through a current transformer 6 to a DC power source. In this case, a parallel circuit of a semiconductor switch 8 and a resistor 9 for damping is provided at the secondary winding side of the transformer 6, and resistors 10a, 10d for resetting the transformer 6 are connected in parallel with a pair of diagonal diodes 7a, 7c of the rectifier 7. Thus, when the voltage of the resistor 9 rises to the prescribed level at the feedback time, the switch 8 is closed to shortcircuit the resistor 9.

79. 发明专利

JPS60121921A OVERCURRENT PROTECTING UNIT OF INVERTER 失效
公开(公告)号：JPS60121921A
公开(公告)日：1985-06-29
申请号：JP22882083
申请日：1983-12-01
申请人： MITSUBISHI ELECTRIC CORP
发明人： ASAEDA TAKEAKI , NAKAMURA TOORU , YUYA TAKASHI
IPC分类号： H02H7/122 , H02M7/48

80. 发明专利

JPS6026493A STARTING FIRING CONTROLLER OF THYRISTOR MOTOR 失效
公开(公告)号：JPS6026493A
公开(公告)日：1985-02-09
申请号：JP13323483
申请日：1983-07-19
申请人： MITSUBISHI ELECTRIC CORP
发明人： MORISHIMA NAOKI , HOSOKAWA YASUHIKO , ASAEDA TAKEAKI , MATSUURA TOSHIAKI
IPC分类号： H02P6/20 , H02P1/46 , H02P6/06 , H02P6/08
摘要： PURPOSE:To enable to determine the optimum starting firing phase by observing the field ripple voltage presented at a terminal of a synchronous motor and discriminating the starting position of a rotor. CONSTITUTION:An armature winding terminal voltage of a synchronous motor 3 is detected by a voltage detector 15, and the magnitude of a ripple voltage generated by the third converter 14 for a field winding presented at the armature winding terminal of the motor 3 is detected by a field ripple voltage amplitude detector 16. This ripple voltage waveform is discriminated by a field ripple voltage waveform discriminator 17. A start firing phase discriminator 18 discriminates the position of a rotor of the motor 3 on the basis of the outputs of the detector 16 and the discriminator 17, thereby deciding the initial firing phase.

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