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1. 发明专利

JPS61293173A POWER SOURCE 失效
公开(公告)号：JPS61293173A
公开(公告)日：1986-12-23
申请号：JP13415385
申请日：1985-06-21
申请人： HITACHI LTD , HITACHI ENG CO LTD
发明人： MASUKO YASUHIRO , YAMAMOTO SHIGERU
IPC分类号： H02M7/06
摘要： PURPOSE:To reduce a leakage current which flows to a power source and a ground in a closed circuit by providing a circuit for reducing the leakage current between the output unit negative potential side of the power source and the ground of the output unit. CONSTITUTION:A power source has an input side rectifier 4, a drive circuit 5, power converters 7, 8 and a leakage current reducing circuit 50. The reducing circuit 50 has a capacitor 10 and resistors 11, 12, and is provided between the output unit negative potential side of the power source and the ground of the output unit. The power of the secondary side coil 30 of a power converter 5 is converted into a DC by the converters 7, 8, and supplied to an arbitrary load.

2. 发明专利

JPH01157271A SEMICONDUCTOR DEVICE 失效
公开(公告)号：JPH01157271A
公开(公告)日：1989-06-20
申请号：JP31200687
申请日：1987-12-11
申请人： HITACHI LTD , HITACHI ENG CO LTD
发明人： KANAZAWA TORU , YAMAMOTO SHIGERU
IPC分类号： H02M3/28
摘要： PURPOSE:To reduce the number of components and improve stabilizing accuracy, by a method wherein a starting circuit and a starting switch circuit are provided to separate a frequency and a duty setting mode upon starting from the same upon stabilizing operation. CONSTITUTION:An inputted AC voltage is rectified and smoothed by a rectifier circuit 2 and a capacitor 3. When a main switch 60 is thrown, a DC voltage is impressed on a starting circuit 61, a starting switch circuit 62 is being put ON for some period of time and a control voltage is supplied from a terminal 55 to the signal setting terminal 64 of a control circuit 63, generating a signal determining the frequency and the duty of a switching circuit 4. Accordingly, a control signal 66 is determined by the impressing voltage of said terminal 65 during starting the starting circuit 61 and the induced voltages of secondary and tertiary windings 5b, 5c are outputted after rectifying and smoothing them by rectifying and smoothing circuits 68, 69. The smoothing output 69 is impressed on the setting terminal 64 and the starting circuit 61 puts the starting switch circuit 62 ON after a predetermined time constant whereby only said output 69 is impressed on the setting terminal 64.

3. 发明专利

JPS63318814A MALFUNCTION PREVENTING CIRCUIT FOR SEMICONDUCTOR ELEMENT 失效
公开(公告)号：JPS63318814A
公开(公告)日：1988-12-27
申请号：JP15330987
申请日：1987-06-22
申请人： HITACHI LTD , HITACHI ENG CO LTD
发明人： KANAZAWA TORU , YAMAMOTO SHIGERU , KOGUCHI YOSHIO , YUSA YUKIE
IPC分类号： H03K17/73 , H03K17/16
摘要： PURPOSE:To improve the voltage rise tolerance of a semiconductor three- terminal element and to prevent the noises mixed through a signal line, by securing the connection between control terminals via the short circuit or a specific impedance when the noise is applied. CONSTITUTION:The DC voltage 22 is connected in the solid line direction of a switch 23 and the voltage is applied to a capacitor 24 to be used as a supply source for pulse voltage. The switch 23 is opened when the application is through with said voltage. In this case, an SCR1a is controlled by a control signal 25 and the DC voltage controlled by the signal 25 is applied to a load 20. Then a switch 26 is applied for application of the pulse voltage to the load 20. While the pulse voltage having a sharp rising rate is applied to an SCR1b connected antiparallel. At the same time, the noises are transmitted via a signal line in response to the discharge of the capacitor 24. Thus the SCR1b has a malfunction. In this case, a switch 26 is short-circuited with both switches 7b and 8b opened respectively. Thus it is possible to cope with the pulse voltage having a sharp rising rate and the mixture of noises. Then the malfunction of the SCR1b can be avoided.

4. 发明专利

JPS61293156A LOAD SWITCHING CIRCUIT 失效
公开(公告)号：JPS61293156A
公开(公告)日：1986-12-23
申请号：JP13415485
申请日：1985-06-21
申请人： HITACHI LTD , HITACHI ENG CO LTD
发明人： KANAZAWA TORU , YAMAMOTO SHIGERU
IPC分类号： H02M1/06
摘要： PURPOSE:To enable multiple parallel loads including a flip-flop circuit to be driven by removing the commutation circuit of load switching circuit of a thyristor and giving optimal control signals. CONSTITUTION:When a control signal 41 turns positive and a control signal 42 zero, a control transistor 35 impressed with the positive control signal is switched on and a conducting transistor 43 comes off. As a result a thyristor of gate-turn-off type (GTO) 27 begins to cut off. On the other hand, as the control signal 42 turns zero, a control transistor 36 is switched off and a cutoff transistor 38 as well. Thus GTO 28 starts to transfer to conduction and the loading current flows. Again, when the control signal 41 turns zero and the control signal 42 positive, the load alternative switching can be performed by repeating the above-mentioned operation.

5. 发明专利

JPS60125164A SWITCH PROTECTING CIRCUIT USING GATE TURN-OFF THYRISTOR 失效
公开(公告)号：JPS60125164A
公开(公告)日：1985-07-04
申请号：JP23140783
申请日：1983-12-09
申请人： HITACHI LTD , HITACHI ENG CO LTD
发明人： KANAZAWA TOORU , YAMAMOTO SHIGERU , SUZUKI BUNJI
IPC分类号： H02M1/06
摘要： PURPOSE:To remove the damage condition when a switch is closed by always charging a capacitor when the switch is closed. CONSTITUTION:Before a switch 21 is closed, a capacitor 26 is charged to the vicinity of a power source voltage in a circuit of a power source 17, a period setting resistor 20, a resistor 24, a resistor 25, the capacitor 26, a resistor 36 and the power source 17. When the switch 21 is closed at this time, a conduction trigger signal is flowed by the power source 17, a limiting resistor 19, a gate terminal 30, a cathode terminal 31, the switch 21, and a load 23, a GTO18 is conducted, and a current is flowed to the load.

6. 发明专利

JPH01170366A PULSE TRANSFORMER INSULATED TYPE GATE CIRCUIT FOR POWER SEMICONDUCTOR ELEMENT 失效
公开(公告)号：JPH01170366A
公开(公告)日：1989-07-05
申请号：JP32408087
申请日：1987-12-23
申请人： HITACHI LTD , HITACHI ENG CO LTD
发明人： YAMADA HAJIME , YAMAMOTO SHIGERU
IPC分类号： H02M1/06 , H03K17/73
摘要： PURPOSE:To reduce the turning ON loss of a GTO by adding a switching element, a high voltage diode to a wide ON pulse circuit. CONSTITUTION:A pulse transformer insulated type gate circuit supplies a narrow ON pulse to a GTO 1 synchronously with an output signal to an overdriving transistor(Tr). A narrow ON pulse supplying Tr 6, a narrow ON pulse limiting resistor 8, base current limiters 7, 9, and a high voltage diode 4 are added. Thus, the added diode 4 is so operated as to bypass a base current to the anode of the GTO 1 when the GTO 1 finishes to turn ON. Thus, the Tr 6 of a switching element is turned OFF, thereby stopping supplying a narrow pulse.

7. 发明专利

JPS61125620A Load fluctuation detecting circuit 失效
标题翻译：负载检测电路
公开(公告)号：JPS61125620A
公开(公告)日：1986-06-13
申请号：JP24604084
申请日：1984-11-22
申请人： Hitachi Eng Co Ltd , Hitachi Ltd
发明人： KANAZAWA TORU , YAMAMOTO SHIGERU
IPC分类号： G05F1/56
摘要： PURPOSE: To form a circuit for detecting the load fluctuation by detecting the current in a load switching circuit and changing a frequency to change a load.
CONSTITUTION: A load 2 and a switch 3 are serially connected to an electric power source 1. A current detecting transformer 4 for detecting the current of the main circuit is connected. The output of the transformer 4 is converted into a detecting signal by a signal detector 5, and inputted to a comparator 6 for comparing the detecting signal with a reference value 7. The comparator 6 transmits both outputs responding to the normal operation and the operation at fluctuation of load to a frequency controller 8, which supplies a control signal to the switch 3. Switching is executed at a frequency f
1 for the normal operation and at a frequency f
2 for the operation at fluctuation of the load. Thus, the load fluctuation is detected without causing the drop of a voltage, with simple circuit, and the circuit is made small in size.
COPYRIGHT: (C)1986,JPO&Japio
摘要翻译：目的：通过检测负载切换电路中的电流并改变频率来改变负载，形成用于检测负载波动的电路。构成：负载2和开关3串联连接到电源1.连接用于检测主电路电流的电流检测变压器4。变压器4的输出由信号检测器5转换成检测信号，并输入到比较器6，用于将检测信号与参考值7进行比较。比较器6根据正常操作和操作向开关3提供控制信号的频率控制器8的负载变动。在正常工作的频率f1和负载变动的动作的频率f2下进行切换。因此，通过简单的电路检测负载波动而不引起电压下降，并且使电路尺寸变小。

8. 发明专利

JPH03280615A PULSE CURRENT GENERATOR AND DEGREE OF VACUUM MEASURING INSTRUMENT FOR VACUUM BULB FOR VACUUM INTERRUPTER 失效
公开(公告)号：JPH03280615A
公开(公告)日：1991-12-11
申请号：JP8169790
申请日：1990-03-29
申请人： HITACHI LTD , HITACHI ENG CO LTD
发明人： YOSHIDA HIROSHI , SUZUKI BUNJI , YAMAMOTO SHIGERU , KANAZAWA TORU , KOGUCHI YOSHIO
IPC分类号： G01L21/00 , H03K3/53
摘要： PURPOSE:To generate a large pulse current whose width is variable by generat ing sequentially a pulse from plural pulse generating circuits each filter element consists of coils and capacitors. CONSTITUTION:The generator is provided with plural pulse generating circuits PG1-PGn each comprising multi-stages of filter elements consisting of coils L1-Ln and capacitors C1-Cn and plural switching means SW1-SWn switching circuits tying a load and outputs of the pulse generating circuits PG1-PGn. More over, a switching drive means is provided, which opens all the switching means SW1-SWn and closes them sequentially, the input of the pulse generating circuits PG1-PGn is connected respectively to a DC power supply 10 and the outputs of the pulse generating circuits PG1-PGn are connected to the load 12 via the switching means SW1-SWn. Thus, a large pulse current with an optional pulse width is generated.

9. 发明专利

JPH0322817A DISCHARGE DETECTING CIRCUIT FOR HIGH VOLTAGE POWER SOURCE 失效
公开(公告)号：JPH0322817A
公开(公告)日：1991-01-31
申请号：JP15458589
申请日：1989-06-19
申请人： HITACHI LTD , HITACHI ENG CO LTD
发明人： KANAZAWA TORU , YAMAMOTO SHIGERU , TOUDA MITSUKUNI
IPC分类号： H02H3/12 , H02H7/00 , H02K7/06 , H02M3/28
摘要： PURPOSE:To inform abnormality of load to the outside by detecting electrical variation at the side of input circuit through a circuit having high voltage generating section upon occurrence of abnormality of load then stopping following discharge phenomenon through utilization of detected signal. CONSTITUTION:Upon occurrence of abnormality in a load, oscillation of ternary winding L3 stops. At this time, voltage to be produced from a current transformer 27 also drops thus lowering the potential at a terminal 32 connected with a comparator 17. When the potential at the terminal 32 drops below the potential at a terminal 43, output from the comparator 17 is inverted and the current flow is deflected from the base terminal 49 to the output of the comparator 17. Consequently, a transistor 38 is disabled and a conduction signal is fed to the gate terminal 39 of a stop thyristor 36 thus conducting the stop thyristor 36. When the stop thyristor 36 conducts, a light emission diode is lighted to inform the abnormality.

10. 发明专利

JPS60223469A SWITCHING CIRCUIT 失效
公开(公告)号：JPS60223469A
公开(公告)日：1985-11-07
申请号：JP7730884
申请日：1984-04-17
申请人： HITACHI ENG CO LTD
发明人： KANAZAWA TOORU , YAMAMOTO SHIGERU
IPC分类号： H02M1/08 , H02M3/135 , H02M3/28 , H02M3/338
摘要： PURPOSE:To accelerate a switching speed by connecting interrupting and conducting transistors with a control terminal of a semiconductor 3-terminal element as a special circuit configuration, thereby reducing the capacity of a control signal. CONSTITUTION:A switching circuit is composed by providing a series unit of a semiconductor 3-terminal element 10 made of a gate turn OFF thyristor and a load 12 across a power source 9. A series unit of a limiting resistor 13, a conducting transistor (Tr)20 and an interrupting Tr11 is connected across the power source 9, and a series unit of a Zener diode 19 and a base limiting resistor 18 is connected from the Tr20 side with the base of the Tr20 and the power source 9. A series unit of the Tr17 and a resistor 21 is connected between the intermediate connection point 22 between the diode 19 and the resistor 18 and the negative terminal of the power source 9 to control to drive the Tr11. Thus, the capacity of the signal 14 is reduced and the switching speed can be accelerated.

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