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1. 发明专利

JPS5566278A AUTOMATIC COMMUTATIONNTYPE DCCDC CONVERTER 失效
公开(公告)号：JPS5566278A
公开(公告)日：1980-05-19
申请号：JP13957878
申请日：1978-11-13
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： MUROYAMA SEIICHI , IWAZAWA MASAKI
IPC分类号： H02M3/315 , H02M7/48
摘要： PURPOSE:To perform control with an operating frequncy being kept constant by connecting diodes in parallel with switching elements and providing shunt switches which are controlled to a conductive state after the switching elements have been turned on. CONSTITUTION:A resonant circuit is formed by connecting a capacitor 13 and a reactor 14 for resonation and a transformer 12 for a rectifier circuit in series. Switching elements S1 and S2 having control electodes are provided and a DC voltage is applied to a load 18. Diodes 21 and 22 are connected in reverse-parallel with the switching elements S1 and S2. Shunt switches S3 and S4 are provided on both sides of the primary winding of a transformer 12, and are controlled to a conductive state after the S1 and S2 have been conducted. Since the control can be achieved with the operating frequency being kept constant, and the switching elements can be turned off correctly, the switching elements can be controlled at the highest operating frequency and the availability can be enhanced.

2. 发明专利

JPH06253449A POWER SUPPLY SYSTEM 失效
公开(公告)号：JPH06253449A
公开(公告)日：1994-09-09
申请号：JP3916493
申请日：1993-03-01
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： TATEDA KUMIHITO , KUWATA YUTAKA , IWAZAWA MASAKI , TANAKA MAKOTO
IPC分类号： H02H3/16 , H02H7/10
摘要： PURPOSE:To enhance the safety and reliability by interrupting a DC power supply output only when the human body mistakenly touches an output line or during the occurrence of power leakage in a power supply system. CONSTITUTION:Voltage detection means 32 is installed between a converting circuit 20 and its circuit breaker 21 for input, and the normal state of the input voltage is detected by the closing of both + and - contacts of the circuit breaker 21. By this detection, a relay contact 34 between the mid-point of capacitors 22 and 23 and earth 5 is closed, and a current-carrying circuit for absorbing noise and surge is made effective. By doing this, any stray current flowing to current detection means 14 due to the time delay between both the contacts of the circuit breaker 21 can be prevented without using labor, and the current detection means 14 can interrupt a circuit breaker 13 for the output from a DC power supply 10 only when an actual ground fault or the like including the operating period of the circuit breaker 21 has occurred. Also, resistors 30 and 31 are connected in parallel to the capacitors 22 and 23 in order to prevent the stray current flowing when the values the capacitors 22 and 23 are unbalanced, thereby also preventing erroneous operation in detecting ground fault or the like.

3. 发明专利

JPH0619566A DC POWER FEEDING SYSTEM 失效
公开(公告)号：JPH0619566A
公开(公告)日：1994-01-28
申请号：JP17351192
申请日：1992-06-30
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： KUWATA YUTAKA , TATEDA KUMIHITO , BABASAKI TADATOSHI , IWAZAWA MASAKI
IPC分类号： G05F1/67 , H01M8/04 , H02J1/10
摘要： PURPOSE:To control the output of a DC power generating device to maximum output electric power at all times by varying by varying the output voltage of the DC power unit of another system which feeds electric power to a load exceeding the capacity of the DC power generating device. CONSTITUTION:When the output electric power P1 of the DC power generating device increases above set electric power, an output voltage detection signal S2 becomes larger than a set electric power signal S3 and the signal S4 of a differential operational amplifier 11 increases. Consequently, the duty ratio of the output pulse width of a pulse width converter 13 becomes large and the output voltage V2 and output electric power P2 of a DC power unit 5 increase through a driving circuit 14. Consequently, the output electric power P1 of the DC power generating device 1 decreases. When the output electric power P1 of the DC power generating device decreases below the set electric power, the reverse phenomenon is caused. The output electric power P of the DC power generating device 1 becomes equal to the set electric power at all times.

4. 发明专利

JPS56112886A SERIAL RESONANT CONVERTER 失效
公开(公告)号：JPS56112886A
公开(公告)日：1981-09-05
申请号：JP1305380
申请日：1980-02-07
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： MUROYAMA SEIICHI , IWAZAWA MASAKI
IPC分类号： H02M3/135 , H02M7/48 , H02M7/515
摘要： PURPOSE:To narrow the range of change in operating frequency in relation to load current by connecting the 2nd serial resonant circuit in parallel to the terminal on the AC side of an output rectifying circuit and by selecting the resonant frequency thereof to be lower than that of the 1st serial resonant circuit. CONSTITUTION:To the 1st resonant circuit connecting serially a capacitor 4 for resonance, a reactor 3 for resonance and the terminal on the AC side of the rectifying circuit 5 and to the terminal on the AC side of the rectifying circuit 5 of the serial resonant converter consisting of switching elements S1 and S2 and of DC power sources 1 and 2 is connected serially the 2nd resonant circuit 10 consisting of a reactor 11 and a capacitor 12, and the resonant frequency thereof is selected to be lower than that of the 1st resonant circuit. Therefore, the range of the change in the operating frequency in relation to the load current becomes narrow, whereby the output voltage can be controlled by slightly changing the operating frequency and the serial resonant converter can be operated outside an audio region.

5. 发明专利

JPH08242589A POWER CONVERTING EQUIPMENT 失效
公开(公告)号：JPH08242589A
公开(公告)日：1996-09-17
申请号：JP4196095
申请日：1995-03-01
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： IWAZAWA MASAKI , TANAKA MAKOTO , OKADA RYOICHI
IPC分类号： H02J3/38 , H02M7/48
摘要： PURPOSE: To provide a power converting equipment capable of stably continuing the operation of a fuel cell without stopping the power supply to other unit after one of the units fails, in the case where the power is being supplied with multiple outputs from the output of the fuel cell. CONSTITUTION: A DC load 5 is connected to the output of a fuel cell 1 through a DC converting equipment 3, and also an AC load 4 linked with a commercial power supply 6 is connected through an AC power converting equipment 2 having an AC converting section 20, a linked reactor 22, a circuit breaker 21, an anomaly detecting section 23, a protecting & controlling circuit 24 and a drive circuit 25. An input overvoltage preventing circuit 26 comprising a high- speed opening type short-circuit switch 264 connected in parallel to a reverse- current preventing diode 263 is connected to the input side of the AC power converting equipment 2. Accordingly, any rise in the output voltage of the fuel cell 1 can be prevented thereby permitting power supply from the fuel cell 1 to a DC converting equipment 3 even when the AC power converting equipment 2 stops.

6. 发明专利

JPH06133445A POWER SUPPLY SYSTEM 失效
公开(公告)号：JPH06133445A
公开(公告)日：1994-05-13
申请号：JP27737592
申请日：1992-10-15
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： TANAKA MAKOTO , KOBORI KOZABURO , KATO MASARU , TAKASAGO TOSHIAKI , KUWATA YUTAKA , IWAZAWA MASAKI , TATEDA KUMIHITO
IPC分类号： H02H3/16 , H02J1/00 , H02M3/07
摘要： PURPOSE:To provide a power supply system which can cut off a DC power supply output only when a leak is created or when a human body mistakenly touches the output line. CONSTITUTION:A DC power supply apparatus 1 has two resistors 12 and 13 which are connected in series to a DC power supply 10 through a circuit breaker 11 and a first current detecting means 14 which is connected between ground 4 and the connection point between the two resistors 12 and 13. A converter 20 which is connected to the DC power supply apparatus 1 through a switch 21 and two capacitors 22 and 23 which are connected in series between the input terminals of the converter 20 are provided. Further, a second current detecting means 25 is connected between ground 5 and the connection point between the capacitors 22 and 23. The reverse signal of the output signal of the second current detecting means 25 and the detection signal of the first current detecting means 14 are inputted to an AND circuit 16 and the circuit breaker 11 is operated by the output signal of the AND circuit 16.

7. 发明专利

JPH06245376A POWER SOURCE 失效
公开(公告)号：JPH06245376A
公开(公告)日：1994-09-02
申请号：JP2524293
申请日：1993-02-15
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： KUWATA YUTAKA , BABASAKI TADATOSHI , IWAZAWA MASAKI , TATEDA KUMIHITO
IPC分类号： G05F1/67 , H01M8/04 , H02J1/00
摘要： PURPOSE:To provide a power source to be coped with by detecting and controlling characteristic change of a DC generator having inherent characteristics of a fuel cell, etc. CONSTITUTION:The power source comprises a main circuit and controller 3, an output error voltage amplifier B for comparing an output detection voltage Vos proportional to an output current of the controller 3 with a reference output voltage Vor to amplify and supply its differential voltage to the controller 3, an input error voltage amplifier C for comparing an input detection voltage Vis of the controller 3 with a reference input voltage Vir, and a reference output voltage controller D for varying the voltage Vor when the voltage Vis is lower than the voltage Vir.

8. 发明专利

JPH06141533A DIRECT CURRENT POWER SUPPLY SYSTEM 失效
公开(公告)号：JPH06141533A
公开(公告)日：1994-05-20
申请号：JP28258192
申请日：1992-10-21
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： BABASAKI TADATOSHI , KUWATA YUTAKA , IWAZAWA MASAKI , TATEDA KUMIHITO
IPC分类号： G05F1/67 , H02J1/00 , H02M1/10 , H02M7/06 , H02M7/12
摘要： PURPOSE:To achieve small size and low cost as well as to utilize fuel cells more efficiently in a DC powder supply system having powder supply units having fuel cells, etc., as input, which are connected in parallel with power units receiving AC power by suppressing the influence of the output ripple on the input side of the power supply unit. CONSTITUTION:The input power of the power supply unit 20 is detected, a switching signal is generated by a voltage control circuit 8 so as to make the input power equal to the set input power and the switching circuit 10 of the power supply unit 20 is controlled using this signal thereby controlling the input power at a constant value. Consequently, the fluctuations in the input voltage and current of the power supply unit 20 due the low frequency ripple voltage and current of the rectifier are eliminated, the output power of the fuel cells 1 is made constant thereby preventing the deterioration of the cells. In addition, by making the target input power equal to the maximum output of the fuel cells, the efficiency of the fuel cells 1 is increased. Further, by eliminating the input power variations, capacitors of large capacitance for protecting the fuel cells become unnecessary thereby making the unit smaller in size and lower in cost.

9. 发明专利

JPH0683466A POWER UNIT 失效
公开(公告)号：JPH0683466A
公开(公告)日：1994-03-25
申请号：JP23479292
申请日：1992-09-02
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： KUWATA YUTAKA , BABASAKI TADATOSHI , IWAZAWA MASAKI , TATEDA KUMIHITO
IPC分类号： G05F1/67 , H02J1/00 , H02M3/00
摘要： PURPOSE:To obtain the power unit which is applicable to variation in characteristics of a DC power generating device with characteristic to a fuel battery, etc., by detecting and controlling the variation. CONSTITUTION:This power unit is equipped with a main circuit and a control circuit 3, an output error voltage amplifying circuit which compares the output detection voltage Vos of the main circuit and control circuit 3 with a reference output voltage Vor and amplifies and supplies the difference voltage to the main circuit and control circuit 3, an input error voltage amplifying circuit which compares an input detection voltage Vis to the main circuit and control circuit 3 with a reference input voltage Vir, and a reference voltage control circuit which varies the reference output voltage Vor when the input detection voltage Vis is lower than the reference input voltage Vir.

10. 发明专利

JPS6249832B2 失效
公开(公告)号：JPS6249832B2
公开(公告)日：1987-10-21
申请号：JP1305380
申请日：1980-02-07
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： MUROYAMA SEIICHI , IWAZAWA MASAKI
IPC分类号： H02M3/135 , H02M7/48 , H02M7/515

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