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11. 发明专利

JPH0784654A POWER CONTROL CIRCUIT 失效
公开(公告)号：JPH0784654A
公开(公告)日：1995-03-31
申请号：JP25221893
申请日：1993-09-14
申请人： SONY TEKTRONIX CORP
发明人： KATO KATSUHISA , ONOZAWA TOSHIHIKO
IPC分类号： G05F1/10 , G01R1/36 , G01R31/26 , G01R31/28 , H02H3/08 , H03K17/08 , H03K17/73
摘要： PURPOSE:To make it possible to protect a circuit without using a fuse by providing this power control circuit with a gate signal generating means for controlling the ON/OFF of a prescribed row in a transistor matrix and a bias means for holding rows other than the prescribed one at ON state. CONSTITUTION:In a transistor (TR) array consisting of (m) rows and (n) columns constituted by connecting semiconductor elements Q11 to Q13, Q21 to Q23 for large current such as insulating gate bipolar transistors (IGBTs) so that (m) TRs are connected in series and (n) TRs are connected in parallel ((m) and (n) are optical integers), the bias means holds TRs other than TRs on a prescribed row at ON state. Namely voltage dividing circuits S11 to S13 divide the voltage of a floating power supply Vf1 and supply bias voltages to the gates of the TRs Q11 to Q13 to hold the TRs Q11 to Q13 always at the ON state. When a pulse generator 30 generates a gate signal and supplies the gate signal to the gate-emitter of the TRs Q21, the TRs Q11, Q21 on the 1st row are turned on and then the TRs Q22, Q23 on the remaining (m) rows are also turned on.

12. 发明专利

JPH02212783A VARIABLE DIRECT CURRENT VOLTAGE GENERATING CIRCUIT 失效
公开(公告)号：JPH02212783A
公开(公告)日：1990-08-23
申请号：JP3308689
申请日：1989-02-13
申请人： SONY TEKTRONIX CORP
发明人： KATO KATSUHISA , ONOZAWA TOSHIHIKO
IPC分类号： G01R31/26 , H02M7/06
摘要： PURPOSE:To adjust an output voltage quickly by providing a control circuit which generates a discharge controlling signal only when an amplitude of an output from a variable alternating current source is reduced to a desired value. CONSTITUTION:An alternating current voltage generated by a variable alternating current source 10 is rectified by a rectifier circuit 12. An output voltage from the rectifier circuit 12 is smoothed by a capacitor 14, so that a direct current voltage is output from an output terminal 15. A controlling circuit 16 generates a discharge controlling signal only when the amplitude of an output from the variable alternating current source is reduced. A discharging circuit 18 reduces the constant when the capacitor 14 discharges. Therefore, discharge of the capacitor 14 can be quickly performed, thereby realizing a short time control also when the output voltage is to be reduced.

13. 发明专利

JPH0917683A MULTI-CAPACITOR CIRCUIT 失效
公开(公告)号：JPH0917683A
公开(公告)日：1997-01-17
申请号：JP29891095
申请日：1995-10-24
申请人： SONY TEKTRONIX CORP
发明人： ONOZAWA TOSHIHIKO , YASU JUNICHI , KATO KATSUHISA , MUROFUSHI TATSUYA , MATSUDA SHUNICHI , SUGIYAMA TAKASHI
IPC分类号： H01G2/00 , H01G4/00
摘要： PROBLEM TO BE SOLVED: To achieve low impedance with a large capacity over a wide band by connecting compensating capacitors which compensate the frequency characteristic in parallel to a multi-capacitor circuit. SOLUTION: Connecting means 12, 14 and 16 are permitted to connect four capacitors in parallel, respectively. Compensating capacitors 30-34 are connected in parallel to the connecting means 12, 14 and 16, which are connected in series. When compensation is made by the compensating capacitors 30-34, the summits of the impedance Z of frequencies f1, f2 and f3 of the multi-capacitor circuit 10 are hollwed and the impedance Z is reduced. Thus, low impedance is achieved over a wide band, while achieving a high capacity by connecting a plurality of capacitors.

14. 发明专利

JPH08308094A CIRCUIT BREAKER APPARATUS 失效
公开(公告)号：JPH08308094A
公开(公告)日：1996-11-22
申请号：JP12702595
申请日：1995-04-27
申请人： SONY TEKTRONIX CORP
发明人： MUROFUSHI TATSUYA , KATO KATSUHISA , ONOZAWA TOSHIHIKO , MATSUDA SHUNICHI
IPC分类号： H02H3/093 , H02H7/20 , H03K17/10 , H03K17/12
摘要： PURPOSE: To prevent generation of noise by suppressing a sudden change of current at the time of cutting off the current flowing into a current path of a load. CONSTITUTION: Output current paths of IGBT 10 to 16 are inserted into a current path of a load 20. Upon detection of a current higher than the predetermined current in the current path of the load, detecting means 22 to 26 change an output signal status. Control means 28 to 48 control IGBT to the conductive condition under the normal condition and when the detecting means controls such IGBT to the non-conductive condition after IGBT is saturated when the output signal status is changed. Namely, when IGBT is saturated, a current flowing into this IGBT becomes a constant current. Therefore, when an over- current flows into the load, such current sequentially increases and becomes constant for a certain period and thereafter it is decreased. Thereby, a sudden change can be prevented.

15. 发明专利

JPH0836019A CHARACTERISTIC MEASURING DEVICE 失效
公开(公告)号：JPH0836019A
公开(公告)日：1996-02-06
申请号：JP19192494
申请日：1994-07-22
申请人： SONY TEKTRONIX CORP
发明人： ONOZAWA TOSHIHIKO
IPC分类号： G01R31/26 , G01R31/00 , H01L21/66
摘要： PURPOSE:To reduce a bad influence due to a noise-reducing capacitor when an element to be measured is destroyed at the time of measuring the element to be measured, to which the noise reducing capacitor is connected. CONSTITUTION:A protecting circuit 30 is provided between a gate and an emitter of an element 10 to be measured, and when this protecting circuit 30 is broken, the load from a noise reducing capacitor 26 is absorbed. This protecting circuit 30 has a protecting capacitor of a capacity larger than the capacity of the noise reducing capacitor 26. A current supplying transistor maintains the voltage of the protecting capacitor at the same voltage as that between terminals at the time of non-destruction of the element to be measured so that the current is not made to flow into the protecting capacitor when the element to be measured is not destroyed.

16. 发明专利

JPH07174814A ELEMENT TESTING METHOD 失效
公开(公告)号：JPH07174814A
公开(公告)日：1995-07-14
申请号：JP34467993
申请日：1993-12-21
申请人： SONY TEKTRONIX CORP
发明人： KATO KATSUHISA , ONOZAWA TOSHIHIKO , EBISAWA AKIRA , USUDA KOICHI
IPC分类号： G01R31/26
摘要： PURPOSE:To check whether there is abnormality or not and efficiently carry out a characteristic test by applying right bias voltage to an element to be tested and detecting the current prior to a characteristic test of the element to be tested. CONSTITUTION:Each terminal of an insulated gate bipolar transistor(IGBT) 10, which is an element to be tested, is set so as to be brought into contact with a terminal of a testing apparatus. Under the control of a processing apparatus 52, a gate bias voltage generating circuit 32 and a collector voltage source 36 generate voltage respectively, so that slight collector current can flow in the case the IGBT 10 is normal. The collector current flows in a resistor 34 and an ADC (A/D converter) 46 supplies digital signals to the apparatus 52. The apparatus 52 determines that the IGBT 10 is short-circuited when the short-circuited collector current at the time short circuit occurs between the collector and the emitter of the IGBT 10 is almost the same as the actual collector current and determines that the circuit is opened at the time the actual collector current does not flow practically. That is, it is determined that the element to be tested has a defect.

17. 发明专利

JPH07170660A POWER SUPPLY DEVICE 失效
公开(公告)号：JPH07170660A
公开(公告)日：1995-07-04
申请号：JP27188794
申请日：1994-10-12
申请人： SONY TEKTRONIX CORP
发明人： KATO KATSUHISA , ONOZAWA TOSHIHIKO
IPC分类号： H02J1/00
摘要： PURPOSE:To provide a power supply device which can supply power to a load by generating a desired high voltage with a simple configuration and adjusting an electrostatic capacitance for accumulating electric charge to a desired value. CONSTITUTION:This device is provided with n capacitor elements CB1-CB4 which are connected serially, a plurality of power supplies S1-S4 for independently charging the corresponding n capacitor elements, a means for detecting each voltage of n capacitor elements, and a means 20 for controlling a plurality of power supplies selectively corresponding to the desired synthetic capacity and output voltage of n capacitor elements. Therefore, by increasing the number of capacitor banks to be charged, a higher output voltage can be obtained. Also, increasing the number of capacitor banks to be charged causes the resultant capacitance to be reduced even if an output voltage is the same. On the contrary, decreasing the number of capacitor banks to be charged causes the resultant capacitance to be increased, thus supplying a desired power to the load.

18. 发明专利

JPH0619284B2 失效
公开(公告)号：JPH0619284B2
公开(公告)日：1994-03-16
申请号：JP11987089
申请日：1989-05-12
申请人： SONY TEKTRONIX CORP
发明人： ONOZAWA TOSHIHIKO
IPC分类号： G01D21/00 , G01D18/00 , G01R35/00

19. 发明专利

JPH02297022A VOLTAGE GENERATING CIRCUIT 失效
公开(公告)号：JPH02297022A
公开(公告)日：1990-12-07
申请号：JP11987089
申请日：1989-05-12
申请人： SONY TEKTRONIX CORP
发明人： ONOZAWA TOSHIHIKO
IPC分类号： G01D21/00 , G01D18/00 , G01R35/00
摘要： PURPOSE:To generate a rectified signal without distortion by obtaining the difference between a signal which is obtained by rectifying the output voltage of a variable gain amplifier by an ideal rectification circuit and a signal corresponding to the output voltage of a rectification circuit at the secondary side of a boosting transformer. CONSTITUTION:An AC voltage with desired amplitude is generated by the voltage gain amplifier 12 in accordance with a control voltage. The output of amplifier 12 is rectified by the rectification circuit 18 through the boosting transformer 16, and a voltage corresponding to the output voltage of circuit 18 is generated by output voltage detecting circuits 23, 26, 28. Further, the output voltage of amplifier 12 is rectified by the ideal rectification circuit 38. Next, the difference between the output voltage of circuit 38 and the output voltage of circuits 24, 26, 28 is outputted by a subtracting device 36; on the other hand, the output amplitude of amplifier 12 is controlled by an adding device 40 in the manner of adding the output voltage of subtracting device 36 and the control voltage, then, a nonlinear characteristic in a low voltage range of the rectification circuit is compensated, thereby the rectified signal without distortion can be generated.

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