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1. 发明专利

JPS57153569A OUTPUT VOLTAGE CONTROL SYSTEM FOR PULSE WIDTH MODULATION INVERTER 失效
公开(公告)号：JPS57153569A
公开(公告)日：1982-09-22
申请号：JP3865481
申请日：1981-03-19
申请人： FUJI ELECTRIC CO LTD
发明人： KURITA SHIGEFUMI , TOMITA HIROO
IPC分类号： H02M7/48 , H02M7/527
摘要： PURPOSE:To optimize the output voltage of a pulse width modulation inverter by supplying the output pulse of a photocoupler through an arithmetic amplifier, a multiplier and an adder to a pulse width modulating circuit, thereby correcting the variation in the input voltage. CONSTITUTION:When the voltage of the input smoothing condenser of an inverter is varied to increase to (1+epsilon)Ed, the average voltage value (e3ave) of the output pulse voltage e3 from a photocoupler becomes larger than the bias value e4 applied by a variable resistor VR in an operational amplifier OPA, and the amplifier OPA produces a negative output voltage e5. When the amplifier OPA is then controlled in its gain at its output voltage value e5 so that the voltage variation rate becomes a value corresponding to the epsilon, a multiplier MUL produces an output of the value corresponding to -epsilon.lambda. Accordingly, when the output of the multiplier MUL and the instruction voltage value e6 are inputted to an adder ADD to be added, the adder produces a value corresponding to (1-epsilon).lambda as an output signal e7, and the instruction voltage value of a pulse width modulating circuit PWMC can be adequately corrected.

2. 发明专利

JPS56162996A LOAD COMPENSATING CIRCUIT FOR VARIABLE FREQUENCY INVERTER 失效
公开(公告)号：JPS56162996A
公开(公告)日：1981-12-15
申请号：JP6462280
申请日：1980-05-15
申请人： FUJI ELECTRIC CO LTD
发明人： KURITA SHIGEFUMI , SUZUKI TATATOMI
IPC分类号： H02P27/06 , H02M7/48 , H02P21/04 , H02P21/05 , H02P21/36 , H02P23/03 , H02P23/04 , H02P23/07 , H02P23/08 , H02P23/16 , H02P23/26 , H02P27/08
摘要： PURPOSE:To lower the noise of a motor, to reduce reactive power and to improve the efficiency of the motor by compensating the terminal voltage approximately responsive to a load, thereby reducing the torque pulsation occurred at a low speed with a light load. CONSTITUTION:A load arithmetic circuit 2' serves to add the frequency command signal of an inverter from an acceleration or deceleration pattern generator 1 and hence the primary frequency command f1 of a motor, and the secondary frequency f2 detected by a tachometer generator TG coupled directly to the motor in reverse polarity and produces a signal corresponding to a slip frequency S.f1. The output of the circuit 2' is inputted to the input side of a voltage regulator 4 as for the compensation setting.

3. 发明专利

JPS56162995A LOAD COMPENSATING CIRCUIT FOR VARIABLE FREQUENCY INVERTER 失效
公开(公告)号：JPS56162995A
公开(公告)日：1981-12-15
申请号：JP6462180
申请日：1980-05-15
申请人： FUJI ELECTRIC CO LTD
发明人： KURITA SHIGEFUMI
IPC分类号： H02M7/48 , H02P21/05 , H02P21/22 , H02P23/04 , H02P23/07 , H02P23/26 , H02P27/06 , H02P27/08 , H02P29/00
摘要： PURPOSE:To improve the efficiency of a load compensating circuit for a variable frequency inverter by supplying a terminal voltage approximately responsive to a load on a motor. CONSTITUTION:The input DC current of an inverter is inputted through a DC current detector DC-CT to a proportional amplifier OP1. The output of the amplifier OP1 will vary approximately in proportion to the speed when a torque is constant. The output from the amplifier OP1 is inputted through an analog switch SW to a proportional amplifier OP2. The analog switch SW is conducted during a period inversely proportional to the speed. The output of the amplifier OP2 becomes a signal depending only upon a torque irrespective of the speed, is averaged by a filter F, and is added as a compensating input to the input side of a voltage regulator 4. A terminal voltage prepared by considering the torque is applied to the motor.

4. 发明专利

JPS56132125A SOLAR PUMP SYSTEM CONTROL DEVICE 失效
公开(公告)号：JPS56132125A
公开(公告)日：1981-10-16
申请号：JP3496380
申请日：1980-03-19
申请人： FUJI ELECTRIC CO LTD
发明人： KURITA SHIGEFUMI , UMEZAWA YASUHIKO
IPC分类号： H02P5/74 , H02J3/00

5. 发明专利

JPS5688669A REDUCTION OF OUTPUT VOLTAGE RIPPLE FOR DC CHOPPER 失效
公开(公告)号：JPS5688669A
公开(公告)日：1981-07-18
申请号：JP16473779
申请日：1979-12-20
申请人： FUJI ELECTRIC CO LTD
发明人： KURITA SHIGEFUMI
IPC分类号： H02M1/14 , H02M3/04 , H02M3/155
摘要： PURPOSE:To reduce the ripple of the output voltage of a DC chopper by inverting the polarity of the ripple of the input voltage of the DC chopper and applying only the ripple component thereof to the output side of voltage regulator. CONSTITUTION:A rectified voltage 3 from a power source voltage 52 is applied to a ripple voltage detector 72, a DC voltage 2 having different polarity to the DC component contained in the rectified voltage and corresponding to the DC component is applied to the detector 72, and the DC component is thus averaged to be zero. The output voltage 4 is added to the output voltage 1 of the DC chopper, and the sum is applied to a pulse width regulator 82, and the output signal 6 from the regulator 82 is applied to the base of a chopper transistor 56. Thsu, the output signal 6 is largely reduced in the input ripple frequency at the average value, and the ripple of the output voltage can be thus reduced.

6. 发明专利

JPS6066692A DRIVE SYSTEM FOR INDUCTION MOTOR 失效
公开(公告)号：JPS6066692A
公开(公告)日：1985-04-16
申请号：JP17288983
申请日：1983-09-21
申请人： FUJI ELECTRIC CO LTD
发明人： KURITA SHIGEFUMI
IPC分类号： H02P27/06 , H02P21/22 , H02P23/07 , H02P27/08
摘要： PURPOSE:To enable to perform a current suppressing effect even in any case by providing discriminating means for discriminating an operation mode, and means for correcting a frequency command in response to a drive or a brake. CONSTITUTION:A drive/brake discriminator 18 is provided, and is constructed to output not only a correction signal from a current detector 17 but also a positive correction signal. Thus, when an overload state occurs at the drive time to reach a current limiting level, it is corrected in a direction for decreasing the frequency, while when reaching the current limiting level at the brake time, it is corrected in a direction for increasing the frequency, with the result that stable operation can be performed irrespective of the operating mode.

7. 发明专利

JPS5937664B2 JPS5937664B2 - 失效
公开(公告)号：JPS5937664B2
公开(公告)日：1984-09-11
申请号：JP16473779
申请日：1979-12-20
申请人： Fuji Electric Co Ltd
发明人： KURITA SHIGEFUMI
IPC分类号： H02M1/14 , H02M3/04 , H02M3/155
CPC分类号： H02M3/04

8. 发明专利

JPS5839277A MODULATING SYSTEM OF PULSE WIDTH MODULATION INVERTER 失效
公开(公告)号：JPS5839277A
公开(公告)日：1983-03-07
申请号：JP13736981
申请日：1981-09-01
申请人： FUJI ELECTRIC CO LTD
发明人： KURITA SHIGEFUMI
IPC分类号： F02B75/02 , H02M7/48
摘要： PURPOSE:To reduce higher harmonic components of lower order by a simple circuit constitution, and to prevent the lowering of the utilization rate of input voltage by bringing base signals supplied to each inverter transistor to proper value. CONSTITUTION:Input DC voltage is supplied to a motor M through an inverter consisting of transistors T1-T6. The base signals fed to each inverter transistor T1-T6 are made signals obtained by removing the pulses of carrier reference pulse signals having equal pulse width by one at every two cycle for an initial 30 deg. period, made ON-level signals through which pulse width is not modulated for the next 60 deg. period, made the carrier reference pulse signals for the next 60 deg. period, made the ON-level signals through which pulse width is not modulated for the next 30 deg. period, and made the inversion signals of the signals of the preceding 180 deg. period for the next 180 deg. period.

9. 发明专利

JPS5749328A Control device for converter driven by solar battery 失效
标题翻译：太阳能电池驱动转换器的控制装置
公开(公告)号：JPS5749328A
公开(公告)日：1982-03-23
申请号：JP12431480
申请日：1980-09-08
申请人： Fuji Electric Co Ltd
发明人： KURITA SHIGEFUMI
IPC分类号： H02J1/00 , G05F1/66 , G05F1/67
CPC分类号： Y02E10/58

10. 发明专利

JPS55141967A OVERVOLTAGE SUPPRESSOR CIRCUIT OF SEMICONDUCTOR ELEMENT 失效
公开(公告)号：JPS55141967A
公开(公告)日：1980-11-06
申请号：JP4717379
申请日：1979-04-19
申请人： FUJI ELECTRIC CO LTD
发明人： KURITA SHIGEFUMI
IPC分类号： H02M1/00 , H02M7/48 , H03K17/08
摘要： PURPOSE:To prevent mutual intervention and to reduce loss by a method wherein semiconductor elements connected with a common power source are collectively connected with a common charge-and-discharge circuit through a respective diode. CONSTITUTION:An inverter device supplying power from a power source Ed to a load Z is constituted by a bridge connection of the semiconductor elements T1- T4, diodes D1-D4. The semiconductor elements T1, T2 connected with bus P are collectively and commonly with an overvoltage preventing charge-and-discharge circuit (enclosed with a dotted line) consisting of a capacitor Cs1, a resistor Rs1, while each other end of the semiconductor elements T1, T2 is connected with the charge-and-discharge circuit through a respective corresponding diodes Ds1, Ds2. The semiconductor elements T3, T4 connected with another bus N are equally connected with the charge-and-discharge circuit (denoted by a suffix s2).

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