专利快速检索-快速检索全球专利，免费商用专利数据库-IPRDB

1. 发明专利

JP2001016862A POWER CONVERTER 失效
公开(公告)号：JP2001016862A
公开(公告)日：2001-01-19
申请号：JP18774599
申请日：1999-07-01
申请人： MITSUBISHI ELECTRIC CORP , TOKYO ELECTRIC POWER CO
发明人： NAKAMURA FUMINORI , TAMAI SHINZO , YAMAMOTO TOUMA , MORI HARUYOSHI , OSHIMA MASAAKI
IPC分类号： H02M7/48 , H02M7/5387
摘要： PROBLEM TO BE SOLVED: To reduce waste loss by suppressing direct change between modes 1, 3 in the vicinity of zero cross of an AC output current command. SOLUTION: An AC voltage control means 15 generates an AC output current command of a self-excited voltage type AC/DC converter 6 from a deviation between an AC voltage command generated in an AC voltage command generating means 12 and an actually measured value of load voltage applied to an AC load 7 detected in a voltage detection means 13. A load voltage applied to the AC load 7 is controlled so as to conform to the AC voltage command, but a low-pass filter means is provided as a direct change suppressing means 22 between the voltage detection means 13 and a subtraction means 14, a large component of high change rate of the frequency included in the load voltage is removed. In this way, a large component of change factor included in the AC output current command of the self-excited voltage type AC/DC converter can be removed, direct change between modes 1, 3 is suppressed, the switching frequency can be set lower, consequently losses can be reduced.

2. 发明专利

JPH1132435A POWER CONVERTER 失效
公开(公告)号：JPH1132435A
公开(公告)日：1999-02-02
申请号：JP18282997
申请日：1997-07-08
申请人： MITSUBISHI ELECTRIC CORP , TOKYO ELECTRIC POWER CO
发明人： NAKAMURA FUMINORI , TAMAI SHINZO , YAMAMOTO TOUMA , OSHIMA MASAAKI , MIYAZAKI SATOSHI
IPC分类号： H02J3/01 , G05F1/70 , H02J3/18
摘要： PROBLEM TO BE SOLVED: To obtain an AC current waveform close to a desired waveform by supplying a power output section with a power command value varying such that the impedance characteristics of a power converter, viewed from an AC power supply, suppresses a harmonic current flowing into the power converter. SOLUTION: A current IS flowing from an AC power supply 1 into a capacitor 6 is detected by a second current detector 7b at a position closer to the AC power supply 1 than the joint of the capacitor 6 and a reactor 5 and the output current Ia from a voltage type inverter 3 is corrected by operating the harmonic component of the detection current IS according to a transfer function. Since such impedance characteristics as the harmonic current IS is suppressed by the output current Ia from the voltage type inverter 3 are attained, the harmonic current IS flowing into the capacitor 6 from the AC power supply 1 can be suppressed effectively even if the output voltage from the AC power supply 1 contains a harmonic voltage.

3. 发明专利

JPH1090311A APPARATUS FOR DETECTING A.C. AMPLITUDE 失效
公开(公告)号：JPH1090311A
公开(公告)日：1998-04-10
申请号：JP24623696
申请日：1996-09-18
申请人： MITSUBISHI ELECTRIC CORP , TOKYO ELECTRIC POWER CO
发明人： TAMAI SHINZO , NAKAMURA FUMINORI , YAMAMOTO TOUMA , OSHIMA MASAAKI , MIYAZAKI SATOSHI
IPC分类号： G01R19/00 , G01R19/04
摘要： PROBLEM TO BE SOLVED: To simplify a circuit constitution by forming an a.c. amplitude estimation value, controlling a controller to make zero an error between the value and an amplitude value of an a.c. signal to be detected, and obtaining the amplitude value from an output. SOLUTION: A phase advancement circuit 5, receiving a voltage signal from an a.c. voltage detector 4, outputs a shift phase voltage signal having a phase advanced by a predetermined amount. A multiplier 14 and a multiplier 15 operate respectively a first, a second a.c. estimation signals by multiplying a first a.c. reference wave of the same phase as that of a voltage signal output from a trigonometric function calculator 13, a second phase-advanced a.c. reference wave output from the calculator 13 by an output of a controller 11. An output of a subtracter 6 becomes a difference of the voltage signal and the first a.c. estimation signal, and an output of a subtracter 7 becomes a difference of the output of the phase advancement circuit 5 and the second a.c. estimation signal. These outputs are multiplied by the first, second a.c. reference waves, and the results are added thereby obtaining an output at an adder 10. The output of the controller 11 as an integrator is changed so that the output of the adder 10 becomes close to zero, whereby the output is nearly equal to the voltage signal, and an amplitude value of a target voltage is detected.

4. 发明专利

JP2002084767A POWER CONVERTER 审中-公开
公开(公告)号：JP2002084767A
公开(公告)日：2002-03-22
申请号：JP2001224843
申请日：2001-07-25
申请人： MITSUBISHI ELECTRIC CORP , TOKYO ELECTRIC POWER CO
发明人： NAKAMURA FUMINORI , TAMAI SHINZO , YAMAMOTO TOUMA , MORI HARUYOSHI , OSHIMA MASAAKI
IPC分类号： H02M7/5387
摘要： PROBLEM TO BE SOLVED: To overcome a problem that a constant deviation of the amplitude is maintained between an AC output current command and an actual AC output current of a self-exciting AC/DC voltage converter 6 in the non-loaded condition, when a current error does not cross the threshold and thereby the linear characteristics cannot be obtained in the output AC voltage drop applied to an AC load 7 and in the load current into the AC load 7. SOLUTION: An adder obtains the final AC output current command by obtaining the sum of an AC output current command and an AC output current command compensated value, and a gate command calculation means generates a gate command for each semiconductor switching of the self-exciting AC/DC voltage converter to result in matching between the AC output current and the final AC output current command.

5. 发明专利

JP2003180035A CIRCUIT FOR SWITCHING SYNCHRONISM OF INVERTER 审中-公开
公开(公告)号：JP2003180035A
公开(公告)日：2003-06-27
申请号：JP2002310711
申请日：2002-10-25
申请人： MITSUBISHI ELECTRIC CORP
发明人： IKEDA KATSUMI , YAMAMOTO TOUMA
IPC分类号： H02J3/38 , H02M7/48 , H02M7/493
摘要： PROBLEM TO BE SOLVED: To reduce power consumption in testing an inverter. SOLUTION: A switch 6b for power supply of a commercial power source is turned on, and then a switch 6a for power supply of the inverter 1 is turned on after starting the inverter 1 so as to set it in a operation test mode, whereupon a switch 351 is switched on to the side of a variable coefficient multiplier 252, and to generate an inverter output current IT of a power factor 1 on the side of a commercial power source 4b, a value K corresponding to the current that a user desires to consume a commercial voltage VS via the coefficient multiplier 252 is varied; and this is turned into an inverter output current command IT*, whereby the power is regenerated on the side of the commercial power source. In this way, the power to be consumed in load in a temperature rise test, etc., of the inverter 1 can be generated on the side of the power source, so that the power to be consumed in the test, etc., can be reduced. COPYRIGHT: (C)2003,JPO

6. 发明专利

JPH10170563A FREQUENCY DETECTION DEVICE 失效
公开(公告)号：JPH10170563A
公开(公告)日：1998-06-26
申请号：JP32529196
申请日：1996-12-05
申请人： MITSUBISHI ELECTRIC CORP
发明人： YAMAMOTO TOUMA
IPC分类号： G01R23/06 , G01R23/14
摘要： PROBLEM TO BE SOLVED: To detect the frequency without using a phase detector and a counter by providing a means for calculating the frequency of a three-phase AC power supply where the angular velocity of a voltage vector is added to a reference angular velocity. SOLUTION: A three-phase/two-phase conversion circuit 101 converts voltages VR, VS, and VT of a three-phase AC power supply 1 read from an A/D conversion circuit used for control operation to values on d-q axis rotary coordinates. A low-pass filter 103 eliminates a high-order constituent contained also in a constituent converted onto the d-q axis after 3phase/bi-phase conversion. Then, a phase difference ψ between a d-axis and a voltage vector is obtained from the output of the low-pass filter 103. Then, the amount of phase change per unit time, namely an angular velocity ω', is obtained by a differential circuit 105. Then, the angular velocities ω' and ω0 are added by an adder 106 for obtaining the angular velocity ω of a three-phase AC power supply, which is multiplied by 1/(2±) by a counter 107, thus obtaining a frequency (f) of the three-phase AC power supply 1.

7. 发明专利

JPH09182447A ABNORMALITY DETECTING CIRCUIT OF POWER CONVERTER 失效
公开(公告)号：JPH09182447A
公开(公告)日：1997-07-11
申请号：JP33353895
申请日：1995-12-21
申请人： MITSUBISHI ELECTRIC CORP
发明人： IKEDA KATSUMI , YAMAMOTO TOUMA
IPC分类号： H02H7/122 , H02M7/48
摘要： PROBLEM TO BE SOLVED: To control an inverter only by one voltage detector by specifying the abnormal state of a voltage detector when the output of an adder exceeds a specified value, and performing the protecting action for a power converter by a fault processing circuit. SOLUTION: Since the algebraic sum of respective line voltages VUS, VVW and VWU is O in principle, the output of an adder 1 is 0 when a voltage detector 14 is normal. When abnormality is caused at a part of the voltage detector 14, however, the output of a certain magnitude is generated in the adder 1. The output is detected by a comparator 2, the abnormal signal of the voltage detector 14 is outputted and an inverter 10 is stopped. Since there is the detection error in the voltage detector 14, it is necessary to provide the adequate detecting width so that the comparator 2 does not judge the detection error as the abnormality. In this way, the control of the inverter and the protection of a load can be performed without using independent voltage detectors for the control and the protection, respectively.

8. 发明专利

JPH0919065A CIRCUIT FOR SYNCHRONIZATION CHANGEOVER OF INVERTER 失效
公开(公告)号：JPH0919065A
公开(公告)日：1997-01-17
申请号：JP16104295
申请日：1995-06-27
申请人： MITSUBISHI ELECTRIC CORP
发明人： IKEDA KATSUMI , YAMAMOTO TOUMA
IPC分类号： H02J3/38 , H02M7/48 , H02M7/493
摘要： PURPOSE: To improve the response characteristic of control by controlling a lateral current flowing between an inverter and commercial power supply during the synchronization changeover therebetween. CONSTITUTION: An output current of an inverter 1 and an output current of a commercial power supply 4b are respectively detected by current detectors 711, 712 to detect deviation, namely, a lateral current between these currents with an adder/subtracter 851. This lateral current is defined as the signal controlled by a virtual impedance circuit 241 for limiting lateral current. For the synchronization changeover, the switch 341 is turned on when the parallel operation starts and an output voltage of inverter is controlled depending on the signal of which cross current is controlled.

9. 发明专利

JPH0646565A POWER CONVERTER 失效
公开(公告)号：JPH0646565A
公开(公告)日：1994-02-18
申请号：JP19527692
申请日：1992-07-22
申请人： MITSUBISHI ELECTRIC CORP
发明人： YAMAMOTO TOUMA
IPC分类号： H02M7/48 , H02M7/497
摘要： PURPOSE:To suppress voltage distortion corresponding to harmonic of load by composing the terminal voltage of load as the combination of an output from a power converter having lower switching frequency and an output from an auxiliary power converter having higher switching frequency thereby quickening control response. CONSTITUTION:An adder/subtractor 401 outputs a difference between an output voltage reference 303 and terminal voltage of a load. A band-pass filter detects a voltage difference component in a frequency band (corrective frequency band) which can not pass through a low frequency inverter 1 but can pass through a high frequency inverter 11. When a detected signal is multiplied by K at an amplifier 503 and fed to a PWM modulation circuit 501, the high frequency inverter 11 outputs a voltage proportional to voltage distortion in reverse phase. The output is passed through an AC filter in the high frequency inverter 11 in order to remove ripples and then added to the output voltage from the low frequency inverter 1 through a transformer 15. Consequently, voltage difference is reduced by a factor of about K as compared with a case where power is fed only through the low frequency inverter 1.

10. 发明专利

JPH1189217A METHOD AND DEVICE FOR CONTROLLING SYNCHRONIZATION AND UNINTERRUPTIBLE POWER UNIT 失效
公开(公告)号：JPH1189217A
公开(公告)日：1999-03-30
申请号：JP23865797
申请日：1997-09-03
申请人： MITSUBISHI ELECTRIC CORP
发明人： YAMAMOTO TOUMA
IPC分类号： G01R25/00 , H02J3/38 , H02J9/06 , H02M1/08 , H02M7/48
摘要： PROBLEM TO BE SOLVED: To constitute a synchronization controller which is not affected by the distortion and unbalance of AC signals of software using a microprocessor, etc. SOLUTION: Three-phase AC signals are synchronized to the output of a frequency divider by means of a variable frequency circuit 13, by executing a program on a processor 21 at every divided frequency value set by means of the frequency divider 27, converting the three-phase AC signals into vectors on rotational coordinates in accordance with the program, then, binding the phase differences between the vectors and the reference axes of the rotational coordinates, and outputting the signals of the phase difference signals to the variable frequency circuit 13 from the processor 21 after amplification.

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