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1. 发明专利

JPH0487572A POWER UNIT 失效
公开(公告)号：JPH0487572A
公开(公告)日：1992-03-19
申请号：JP19853390
申请日：1990-07-24
申请人： NIHON KUUKOU DOURIYOKU KK , NISSIN ELECTRIC CO LTD
发明人： KOKETSU YOSHIKI , OKUMURA YUJI , OGIWARA YOSHIYA , YASUOKA SHUICHI , TADA TOMOSHI
IPC分类号： H02M7/48
摘要： PURPOSE:To obtain a power unit having high control-accuracy and high efficiency by coarsely adjusting voltage variations caused by load variations with large-capacity 3-phase rectangular wave inverters, and by finely adjusting with small-capacity single-phase PWM sine-wave inverters at every phase. CONSTITUTION:Each phase output of large-capacity 3-phase rectangular wave inverters 5a, 5b is connected with the outputs of three small-capacity single- phase PWM sine-wave inverters 12a-12c in series respectively. By this constitution, composite voltages of the output voltages of 3-phase rectangular wave inverters 5a, 5b and those of three single-phase PWM sine-wave inverters 12a-12c added in series at every phase are applied to a load. On this occasion, voltage variations caused by load variations are adjusted coarsely by the large-capacity 3-phase rectangular wave inverters 5a, 5b, and adjusted finely by the small- capacity single-phase PWM sine-wave inverters 12a-12c at every phase.

2. 发明专利

JPH1172533A POWER SOURCE APPARATUS FOR WITHSTAND VOLTAGE TEST 失效
公开(公告)号：JPH1172533A
公开(公告)日：1999-03-16
申请号：JP23464597
申请日：1997-08-29
申请人： NISSIN ELECTRIC CO LTD
发明人： YASUOKA SHUICHI
IPC分类号： G01R31/12 , G01R31/14
摘要： PROBLEM TO BE SOLVED: To shorten the tuning time and facilitate the tuning work by carrying out a withstand voltage test by applying a voltage of a predetermined frequency to a circuit to be tested outside a case from an inverter while suppressing noises generated from the inverter. SOLUTION: A d.c. power feed part 4 converts a commercial a.c. source voltage Va into d.c. and outputs it. An inverter 5 converts the output of the d.c. power feed part 4 into an a.c. of a predetermined frequency and outputs it. A low-pass filter 6 shuts a high frequency band of an output of the inverter and cuts noises and a carrier frequency. A shielded transformer Ta is connected to an output of the low-pass filter via a first common mode choke 7a of a predetermined count, cuts noises of the output, transforms a voltage of the output and outputs. A case A stores the d.c. power feed part 4, etc., and is insulated from the ground. A optical cable 9 is used for a signal system connecting a control part 8 and the inverter 5 to prevent invasion of external noises. In the constitution, inverter noises are suppressed limitlessly and attenuated by 100 dB or more in comparison with the prior art.

3. 发明专利

JPH0467742A INSTANTANEOUS VOLTAGE DROP COMPENSATOR 失效
公开(公告)号：JPH0467742A
公开(公告)日：1992-03-03
申请号：JP17983490
申请日：1990-07-06
申请人： NISSIN ELECTRIC CO LTD
发明人： YASUOKA SHUICHI , TADA TOMOSHI , MORITA KOSUKE
IPC分类号： H02J9/06
摘要： PURPOSE:To prevent excessive increase of DC capacitor charging voltage by suppressing the amplitude of a reference voltage determining the waveform of output voltage when the level of current flowing from an inverter into the DC capacitor in the charging direction exceeds a predetermined level. CONSTITUTION:A voltage corresponding to the DC component of current on DC side of an inverter detected through a current detector appears on the output side of a lowpass filter 11 and compared with a set value by means of a comparator 14. When it is lower than the set value, an analog switch 13 is turned OFF. 1pu voltages are applied through a subtractor 15 onto one input terminals of multipliers 16-18 having the other input terminals to be applied with reference voltages VA, VB, VC for respective phases which are outputted while being multiplied by 1. The analog switch 13 is turned ON when the voltage corresponding to DC component of current on DC side of inverter detected through the current detector exceeds the set value.

4. 发明专利

JPH03164033A SERIES COMPENSATING AUTOMATIC VOLTAGE ADJUSTER 失效
公开(公告)号：JPH03164033A
公开(公告)日：1991-07-16
申请号：JP30026289
申请日：1989-11-17
申请人： NISSIN ELECTRIC CO LTD
发明人： YASUOKA SHUICHI , TADA TOMOSHI , MORITA KOSUKE
IPC分类号： H02J3/12 , G05F1/24
摘要： PURPOSE:To enable accurate automatic voltage adjustment by equipping it with an open control system, which detects the differential voltage between power source voltage and reference voltage and controls the output voltage to the load side, and a feedback control system, which detects the differential voltage between said output voltage and reference voltage and controls said output voltage. CONSTITUTION:In general, the frequency ingredient of erroneous voltage VE is higher than the fundamental frequency. Accordingly, to make the gain of a transmitting function T2 (s) in such frequency band small, the controlled transmitting function G (s) is given by G(s)=K1+K2s. In this case, the transmitting function T2(s) becomes as follows: T2(s)=1/(1+K, K2s). That is, the transmitting function T2 (s) becomes first order lag, which has the properties of DC gain:1/(1+K1), and time constant: K2/(1+K1). As a result, the effect of error voltage becomes hard to arise in load currents.

5. 发明专利

JPH11122950A INVERTER POWER DEVICE 失效
公开(公告)号：JPH11122950A
公开(公告)日：1999-04-30
申请号：JP28393897
申请日：1997-10-16
申请人： NISSIN ELECTRIC CO LTD
发明人： YASUOKA SHUICHI
IPC分类号： H02J3/18 , G05F1/70 , H02M1/12 , H02M7/48
摘要： PROBLEM TO BE SOLVED: To provide an inverter power device, in which inverter output capacitance is reduced by canceling capacitor phase-advancing reactive power. SOLUTION: This inverter power device has an inverter 3 for converting a DC input into an AC having fixed frequency and outputting it, a low-pass filter 4, in which a capacitor Cb is connected in parallel with an output from the inverter 3 via a series reactor La and which removes a higher harmonics component excepting fundamental wave contained in the output from the inverter 3 and a transformer Tc, in which the primary sides are connected at both ends of the capacitor Cb. In this case, the gap of a transformer core is set so that the exciting impedance Zo' of the transformer Tc mode is equal to the impedance Zc of the capacitor Cb in fundamental frequency, and reactive power flowing through into the capacitor Cb is canceled by reactive power which flows into the exciting impedance Zo'.

6. 发明专利

JPH08314549A SMALL POWER SUPPLY DEVICE 失效
公开(公告)号：JPH08314549A
公开(公告)日：1996-11-29
申请号：JP12002795
申请日：1995-05-18
申请人： NISSIN ELECTRIC CO LTD
发明人： YASUOKA SHUICHI
IPC分类号： G05F1/10
摘要： PURPOSE: To provide a small power supply device which supplies power on a high potential rack without supplying power especially to the electronic circuit of high potential from ground potential by nongrounding and which does not need an insulating transformer and the like. CONSTITUTION: A piping route 1 having a circulating pump 3 and circulating fluid for heating active element cooling F and small generators 2a, 2b, 2c and 2d having rotary shaft parts for generating coil driving T inserted in the middle of the piping route 1 and supplying power generated by rotating/driving the rotary shaft parts T by fluid energy in the piping route 1 to the electronic circuits Ga, Gb, Gc, Gd, Qa, Qb, Qc and Qd of non-grounding as driving power are provided.

7. 发明专利

JPH11266584A DC POWER SOURCE 失效
公开(公告)号：JPH11266584A
公开(公告)日：1999-09-28
申请号：JP6859398
申请日：1998-03-18
申请人： NISSIN ELECTRIC CO LTD
发明人： YASUOKA SHUICHI
IPC分类号： H02M7/06 , H02M7/155
摘要： PROBLEM TO BE SOLVED: To reduce the cost by about 10%, as compared to those of prior art by reducing an apparatus capacity by a preliminary charger, which realizes a rush current suppressing means and a small installation space and small loss. SOLUTION: This DC power source has a DC-to-AC converter 5 connected to an AC power source Vs, via breaker 4 to DC-convert an AV power voltage Vs into supply a DC to a main power source 2 via a DC capacitor Ca. In this case, a preliminary charger 11 having small capacity DC power sources Vt, Tb, 13 and having a current-limiting resistor Rb is connected to a DC capacitor connecting point P via electromagnetic switches 12, 14 which are controlled by a voltage detector 7. Then before the AC power source Vs is connected, the capacitor Ca is charged preliminarily to a predetermined voltage by the charger 11. Then, the charger 11 is opened, the power source Vs is applied to suppress a rush current generation at the applying of the power.

8. 发明专利

JPH0833316A ACTIVE FILTER 失效
公开(公告)号：JPH0833316A
公开(公告)日：1996-02-02
申请号：JP15776094
申请日：1994-07-11
申请人： NISSIN ELECTRIC CO LTD
发明人： YASUOKA SHUICHI , TOKUDA KENSHO
IPC分类号： H02J3/01 , H02M1/12
摘要： PURPOSE:To control the secondary voltage of a step-down transformer at a constant level in an active filter having a step-down transformer equipped with an automatic tap changer for supplying a constant voltage and connected in parallel with a main transformer equipped with an automatic tap changer for supplying a constant voltage. CONSTITUTION:The active filter comprises a step-down transformer 9 equipped with an automatic tap changer 12 connected in parallel with a main transformer 4 equipped with an automatic tap changer 8, an injection transformer 10 inserted between the output of the step-down transformer 9 and a load 3, an inverter 11 supplying a compensation voltage for offsetting the harmonics, a current transformer 16 for detecting the load current, a reactor 17 having the leakage impedance of the main transformer 4 and fed with a detection current from the current transformer 16, a first transformer 18 for detecting the secondary voltage of the main transformer, and a second transformer 19 for detecting the inverter side voltage of the injection transformer 10. The active filter further comprises a third transformer 20 for detecting the voltage across the reactor, an adder 21 for adding the outputs from the first, second and third transformers and outputting a voltage corresponding to the secondary voltage of the step-down transformer, and a controller 15 for controlling the automatic tap changer 12 depending on the output from the adder 21.

9. 发明专利

JPH03215171A INVERTER POWER SOURCE 失效
公开(公告)号：JPH03215171A
公开(公告)日：1991-09-20
申请号：JP943390
申请日：1990-01-17
申请人： NISSIN ELECTRIC CO LTD
发明人： YASUOKA SHUICHI , TADA TOMOSHI , MORITA KOSUKE
IPC分类号： H02M7/497
摘要： PURPOSE:To expedite the response of a change in an output voltage and to simplify a circuit construction with the cost reduction resulting therefrom by a method wherein output voltages of two rectangular-wave inverter groups of the same voltage amplitude which output voltages of a rectangular wave being an equivalent pulse rectangular wave or above by a serial multiple synthesis of output voltages of rectangular-wave inverters are subjected to the serial multiple synthesis. CONSTITUTION:The phase of an output voltage of a rectangular-wave inverter group I is advanced by an angle (phi) from a reference phase, while the phase of an output voltage of a rectangular-wave inverter group II is retarded by the angle phi from the reference phase. Then the phases of voltages of serial multiple synthesis of the rectangular-wave inverter groups I and II are left to be the same with the reference phase and only the amplitudes thereof take values corresponding to the angle phi. By changing the angle phi, accordingly, only the amplitudes can be so changed as to correspond to the change of the angle phi without the phases of the voltages of serial multiple synthesis of the rectangular-wave inverter groups I and II being varied from the reference phase.

10. 发明专利

JPH10285945A INVERTER POWER UNIT 失效
公开(公告)号：JPH10285945A
公开(公告)日：1998-10-23
申请号：JP8640897
申请日：1997-04-04
申请人： NISSIN ELECTRIC CO LTD
发明人： YASUOKA SHUICHI
IPC分类号： F25D1/00 , H02M7/04 , H02M7/48 , H05K7/20
摘要： PROBLEM TO BE SOLVED: To more efficiently cool an inverter power unit and, at the same time, to make the power unit compact. SOLUTION: In an air-cooled inverter power unit in which inverter stacks 13a and 13b which cool the cooling fins 12a and 12b of a switching element with the intake air of cooling fans 11a and 11b are respectively housed in the front- and rear-face sides (a) and (b) of a housing 14, the inverter stacks 13a and 13b on the front- and rear-face sides (a) and (b) of the housing 14 are positioned so that the suction sides of the stacks 11a and 11b on which the fans 11a and 11b are positioned may be faced respectively to the front- and rear-face sides (a) and (b) of the housing 14 and an air chamber 16 having window openings 15a and 15b which are respectively faced to the cooling fins 12a and 12b of the inverter stacks 13a and 13b is provided between the facing cooling fins 12a and 12b of the stacks 13a and 13b. In addition, a ventilation fan 17 which sets the inside of the air chamber 16 in a negative-pressure state is successively provided to the chamber 16.

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