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1. 发明专利

JPH02299499A CONTROL METHOD FOR SERIES CONNECTED INVERTER 失效
公开(公告)号：JPH02299499A
公开(公告)日：1990-12-11
申请号：JP11983389
申请日：1989-05-12
申请人： FUJI ELECTRIC CO LTD
发明人： TOMITA HIROO
IPC分类号： H02M7/493 , H02P5/74
摘要： PURPOSE:To eliminate discharge circuit by performing output frequency reduction control for an inverter at voltage drop side and balancing the voltage with power regenerated through an AC motor. CONSTITUTION:AC motors 3, 13 are operated through inverters 2, 12 connected in series with a DC power source 1. Voltages across capacitors C1, C2 are detected through voltage detectors 4, 14, then the differences between the capacitor voltages and a voltage VS, which is half of source voltage, are fed through integrator/amplifiers A1, A2 to the output of a frequency setter VR with the polarity being inverted. Since the frequency command for one of the capacitors C1, C2, having lower voltage, drops and the inverters 2, 12 are controlled by the dropped frequency command, corresponding one of the capacitors C1, C2 is charged with power regenerated through the AC motors 3, 13 thus maintaining voltage balance.

2. 发明专利

JPH0274171A SEPARATELY EXCITED INVERTER 失效
公开(公告)号：JPH0274171A
公开(公告)日：1990-03-14
申请号：JP22530688
申请日：1988-09-08
申请人： FUJI ELECTRIC CO LTD
发明人： TOMITA HIROO
IPC分类号： H02M7/757
摘要： PURPOSE:To reduce the overcurrent proof of a semiconductor device by providing a self-extinction of arc-type semiconductor device in series with a separately excited inverter arm or an inverter for rapidly breaking a DC short-circuit current at the time of commutation failure. CONSTITUTION:AC power 1 is rectified by a bridge composed of a thyristor 2 and a GTO thyristor 3, converted into AC by an inverter 8 after smoothing, and supplied to an induction motor 9. At the time of a braking operation of said induction motor 9, a driving switch 4 is OFF and a braking switch 5 is ON, and said thyristor 2 and GTO thyristor 3 operate as inverter. When said power 1 is lost at said braking time, the GTO 3 conducts a braking operation by a GTO control circuit 12, and if the voltage across the ends of a reactor 6 goes to excess, a thyristor 10 is ON by a firing circuit 11 and an overvoltage is prevented from spreading to a converter.

3. 发明专利

JPH01231664A CONTROL POWER SUPPLY CIRCUIT FOR CURRENT TYPE INVERTER 失效
公开(公告)号：JPH01231664A
公开(公告)日：1989-09-14
申请号：JP5698788
申请日：1988-03-10
申请人： FUJI ELECTRIC CO LTD
发明人： TOMITA HIROO
IPC分类号： H02M7/48
摘要： PURPOSE:To facilitate a restart of power supply at the time of power failure by taking out a control power from the power source side of a current type inverter and from the load side of a DC reactor and by supplying said power from any one of said sides. CONSTITUTION:A current type inverter is formed by a converter 3 having a thyristor constitution, a DC reactor 4 and a diode to be used as a current source, and an inverter 5 composed of transistor, and AC power is supplied from an AC power source 2 to said inverter to supply a load 6 with a specified AC power. Further, a short-circuit thyristor 7 is connected with a DC intermediate circuit in parallel with said inverter 5 to be short-circuited at an abnormal time. In this case, a control power is taken out not only from the AC power source 2 via transformer 11 but also from AC outputted by the inverter 5 via transformer 21 to be in putted to a power selector circuit 22. Thus, even if the AC power 2 is OFF, said inverter 5 continues to output power, which is then sent to a control power circuit 12.

4. 发明专利

JPS58116065A OVERCURRENT DETECTING AND PROTECTING SYSTEM FOR SEMICONDUCTOR CONVERTER 失效
公开(公告)号：JPS58116065A
公开(公告)日：1983-07-11
申请号：JP21494481
申请日：1981-12-28
申请人： FUJI ELECTRIC CO LTD
发明人： TOMITA HIROO
IPC分类号： H02M1/00
摘要： PURPOSE:To prevent a circuit element from damaging by detecting the rising rate of a current which flows through a smoothing condenser, thereby rapidly detecting the current of a trouble. CONSTITUTION:A current which flows through a smoothing condenser 2 is detected by a detector 5, is differentiated by a differentiating circuit 6a, and is compared with a reference level which is determined in advance by a comparator 6b. Then, the compared result is fed through a timer 6c, is removed at a signal which is lower than the prescribed width, only the signal which continues for longer than the prescribed period of time like a trouble current is produced, is led to an inverter base controller 7, and the base of the inverter 3 is interrupted. Then, the trouble can be detected at the early stage wherein the overcurrent is not sufficiently raised and breaking of the converter can be performed.

5. 发明专利

JPS56132175A FREQUENCY CONTROL METHOD FOR VOLTAGE-TYPE INVERTER 失效
公开(公告)号：JPS56132175A
公开(公告)日：1981-10-16
申请号：JP3496580
申请日：1980-03-19
申请人： FUJI ELECTRIC CO LTD
发明人： TOMITA HIROO
IPC分类号： H02P3/18 , H02M7/48 , H02M7/539
摘要： PURPOSE:To suppress an increase of a DC circuit voltage at time of regenerative action by actuating a DC circuit voltage on an inverter and correcting an inverter frequency based on the said detection in such direction that an electric motor slip may be minimized. CONSTITUTION:When an induction motor 2 is driven by means of a voltage on a DC circuit 1-D for an inverter is detected by a detection means 3 consisting of a proportional integrator which integrates a differential between the said voltage and a reference voltage. Then an output from the said detection means is input to a correction means 4 consisting of an adder which adds a frequency command value and an output voltage of the detection means 3, controlling a frequency for the inverter 1 through a voltage-frequency converter 5. Consequently, it is possible to minimize a slip of an electric motor 2 through the increasing of an interver frequency when a voltage has increased following the return of a regenerative power to DC circuit 1-D side at time of a regenerative action. Thus an overvoltage can be prevented effectively.

6. 发明专利

JPS5666189A OVERVOLTAGE PROTECTOR FOR ELECTRIC MOTOR VARIABLE SPEED OPERATING INVERTERS 失效
公开(公告)号：JPS5666189A
公开(公告)日：1981-06-04
申请号：JP14077179
申请日：1979-10-31
申请人： FUJI ELECTRIC CO LTD
发明人： KURITA SHIGEFUMI , TOMITA HIROO
IPC分类号： H02H7/122 , H02P3/18 , H02P3/22 , H02P23/00
摘要： PURPOSE:To prevent the breakdown due to the overvoltage of a semiconductor device by temporarily interrupting inverter-frequency lowering operation for breaking when the voltage detection signal of the smoothing capacitor of an inverter has reached a fixed upper limit value. CONSTITUTION:The revolution braking of a motor 3 is performed by applying regenerative braking with a speed instruction pattern given to make a stator frequency omega1 lower than the rotor frequency omega2 by an acceleration and deceleration operator 12. The voltage detection signal of a capacitor 4 fro a voltage detector 21 and the capacitor voltages fixed upper limit value signal from a setting device 22 are compared by a comparator 23. When the capacitor voltage has exceeded a fixed upper limit value, the comparator 23 outputs signal and speed instruction value is held by the signal so that the lowering speed instruction value is interrupted. When the capacitor voltage returns to a normal range, the output signal of the comparator 23 disappears to cancell holding action so that the speed instruction value lowers to a given pattern.

7. 发明专利

JPS5566290A DISCHARGING SYSTEM FOR RESIDUAL CHARGE OF INPUT SMOOTHING CAPACITOR IN INVERTER 失效
公开(公告)号：JPS5566290A
公开(公告)日：1980-05-19
申请号：JP13880478
申请日：1978-11-13
申请人： FUJI ELECTRIC CO LTD
发明人： TOMITA HIROO
IPC分类号： H02M7/537
摘要： PURPOSE:To discharge residual charge in a smoothing capacitor by giving other signals to at least a pair of controllable electric valves in series to conduct them after blocking all control pulses in an inverter. CONSTITUTION:A base-signal distributor 18 is connected to power-supply lines 10 and 14 through a voltage-frequency converter 12 and a NOT circuit 16. From the output the distributor 18, base signals for inverter transistors T1-T6 are obtained. However, the base signals for the transistors T1 and T6 are fed through OR circuits 26 and 40. When the signals are applied to the OR circuits 26 and 40 from the base- signal distributor 18 after the inverter has been gate-locked, the transistor T1 and T6 are conducted, and the discharge circuit for an input smoothing capacitor CF is formed by way of a load M. Therefore, the residual charge can be perfectly discharged without a discharge resistor RF or a relay Ry.

8. 发明专利

JPS5141820A CHOKURYUCHOTSUPANO KOSHOKENSHUTSUSOCHI 失效
公开(公告)号：JPS5141820A
公开(公告)日：1976-04-08
申请号：JP11441374
申请日：1974-10-04
申请人： FUJI ELECTRIC CO LTD
发明人： SENZAKI FUMIO , MINAMOTO MASAHIRO , TOMITA HIROO
IPC分类号： H02M3/135

9. 发明专利

JPS5140522A 失效
公开(公告)号：JPS5140522A
公开(公告)日：1976-04-05
申请号：JP11411274
申请日：1974-10-03
申请人： FUJI ELECTRIC CO LTD
发明人： SENZAKI FUMIO , MINAMOTO MASAHIRO , TOMITA HIROO
IPC分类号： H02J1/10 , G05F1/56 , H02M3/10 , H02M3/135

10. 发明专利

JPS6412830A UNINTERRUPTIBLE POWER SOURCE 失效
公开(公告)号：JPS6412830A
公开(公告)日：1989-01-17
申请号：JP16639187
申请日：1987-07-03
申请人： FUJI ELECTRIC CO LTD
发明人： TOMITA HIROO
IPC分类号： H02J9/06
摘要： PURPOSE:To improve a transient responsiveness at the time of power supply interruption and to reduce the size and weight of a whole uninterruptible power source by connecting a backup battery through a 3-winding transformer and a power reactor/inverter between an inverter and smoothing means. CONSTITUTION:A commercial power supply 1 is input to a first power converter (inverter) 20 for converting to an AC having predetermined voltage and frequency, and the conversion output is input through the primary and secondary sides of a 3-winding transformer 30 to a second power smoothing unit 44. A battery 10 is connected through a power reactor/inverter 50 to the tertiary winding 33 of the transformer 30. The phase angle of a switching element of the reactor/inverter 50 is controlled by a controller provided separately to charge the battery 10 when the power supply 1 is normal, and power is supplied from the battery 10 to a load 60 at the time of power interruption.

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