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101. 发明专利

JPS5844519A CONSTANT CURRENT SOURCE 失效
公开(公告)号：JPS5844519A
公开(公告)日：1983-03-15
申请号：JP14102881
申请日：1981-09-09
申请人： HITACHI LTD
发明人： IZAKI NAOYUKI , SAGAWA AKIO , SUZUKI MASAYOSHI
IPC分类号： G05F3/26 , G05F3/22
摘要： PURPOSE:To eliminate effectively an effect of the floating electrostatic capacity which enters equivalently the line connected to a constant current circuit via a switch circuit, by setting an electrostatic capacity circuit between the output terminal of the constant current circuit and a power supply or between the output terminal and an earth. CONSTITUTION:When a switch 21 is applied, an overcurrent flows to the floating capacity through an electrostatic capacity 4 which is newly provided. Thus the floating capacity is suddenly charged. Thus the potential VP of the switch 21 at the power supply side is set as VP=CN/(CN+CO)XVCC, where VCC, CN, CO and VP are a power supply, a capacity 41 newly provided, a floating electrostatic capacity and the voltage at a point P, respectively. As a result, the voltage VP can be set larger than the reference voltage VS even when a switch is applied. An effect of the floating capacity can be effectively prevented by setting the a capacity CN larger enough than the capacity CO.

102. 发明专利

JPS5813065B2 失效
公开(公告)号：JPS5813065B2
公开(公告)日：1983-03-11
申请号：JP8512076
申请日：1976-07-19
申请人： HITACHI LTD
发明人： SAGAWA AKIO
IPC分类号： H04N1/403 , G06K9/00 , G06T1/00 , H04N1/40

103. 发明专利

JPS5827426A PULSE VOLTAGE GENERATING CIRCUIT 失效
公开(公告)号：JPS5827426A
公开(公告)日：1983-02-18
申请号：JP12522181
申请日：1981-08-12
申请人： HITACHI LTD
发明人： SAGAWA AKIO , IZAKI NAOYUKI , SUZUKI MASAYOSHI , MATSUDA YASUMASA
IPC分类号： H03K17/735 , A61B8/00 , G01N29/04 , H02M1/08 , H03K5/00 , H03K5/02
摘要： PURPOSE:To eliminate losses for synthesizing a bias voltage and a pulse voltage, by constituting a pulse voltage generating circuit and a bias voltage generating citcuit with one circuit. CONSTITUTION:When a bias voltage controlling signal PB is inputted, a power supply voltage VBH is divided at a dividing tatio controlling citcuit 73 and a bias voltage VBB is generated. At the period when the bias voltage controlling signal PB is inputted, if a pulse voltage controlling signal PH is inputted, the pulse voltage VBH is generated at a dividing ratio controlling circuit 74. In this case, since the power supply voltage is VBH, the voltage dividing ratio is set to 1. Thus, since a superimposing voltage between the bias and pulse voltages is outputted from an output terminal 77 of a pulse voltage generating circuit 70, the losses for synthesizing these two voltages can be eliminated.

104. 发明专利

JPS57207918A CONSTANT-CURRENT CIRCUIT 失效
公开(公告)号：JPS57207918A
公开(公告)日：1982-12-20
申请号：JP9304981
申请日：1981-06-18
申请人： HITACHI LTD
发明人： SUZUKI MASAYOSHI , SAGAWA AKIO , IZAKI NAOYUKI
IPC分类号： H03F3/343 , G05F1/10 , G05F1/56 , H03F3/34
摘要： PURPOSE:To obtain a constant-current circuit which can be grounded through one end of its output terminal, by using a summed voltage of the voltage from the input voltage source and a feedback voltage obtained by inverting the output of a voltage-current converting circuit having the residual voltage characteristcis as the input voltage of the converting circuit. CONSTITUTION:A part of the output of a voltage-current converting circuit 9 is impressed upon an adder 8 after it is inverted through a feedback circuit 22. The circuit 8 adds a supply voltage from an input terminal 7 and a feedback voltage from the circuit 22 together, and outputs the summed voltage to the circuit 9. The electric current I outputted from the circuit 9 appears at a terminal 23 and the other terminal 233 can be grounded. When the input voltage, the residual voltage based on the nonlinearity of the circuit 9, and the feedback voltage of the circuit 22 are represented as Vi, Vs, and Vf, respectively, the electric current I can be expressed in a formula, I=K(Vi+Vf-Vs), where, K is a proportional constant. When the residual voltage and the feedback voltage are offset to each other by selecting the Vf so that the Vf may be equal to the Vs, the formula becomes I =KVi, and thus, an electric current I which is proportional to the input voltage can be obtained.

105. 发明专利

JPS56123124A INTERFACE CIRCUIT 失效
公开(公告)号：JPS56123124A
公开(公告)日：1981-09-28
申请号：JP2665480
申请日：1980-03-05
申请人： HITACHI LTD
发明人： SAGAWA AKIO , SUZUKI MASAYOSHI , IZAKI NAOYUKI
IPC分类号： H03K19/018 , H03K17/60 , H03K17/615
摘要： PURPOSE:To reduce an input current nearly to zero by decreasing reverse hFE equivalently by supplying an input to the emitter of a Darlington-connected transistor by connecting the base of a power source via a resistance. CONSTITUTION:A Darlington connection between transistors 54 and 55 is made to constitute initial-stage transistor 50. Terminal 51 is regarded as the emitter for an input terminal, and terminal 53 as the collector for an output terminals, so that large hFE can be obtained in normal operation. In reverse operation with terminal 53 regarded as the emitter, the current flowing from the base of transistor 55 to the collector flows via resistance 36 and no base current flows through transistor 54. Therefore, reverse hFE decreases extremely and the input current is nearly ceased.

106. 发明专利

JPS5524406A PHOTOSEMICONDUCTOR SWITCH CIRCUIT 失效
公开(公告)号：JPS5524406A
公开(公告)日：1980-02-21
申请号：JP9614078
申请日：1978-08-09
申请人： HITACHI LTD
发明人： SAGAWA AKIO , SUZUKI MASAYOSHI
IPC分类号： H01H47/24 , H01L31/12
摘要： PURPOSE:To hold ignition sensitivity and dv/dt capacity compatible each other where resistance between gate and cathode of photo SCR is not given high at giving light ignition signals. CONSTITUTION:A luminous element 3 is ignited and SCR1 is radiated to ignition from applying a negative pulse signal to the input of logical element for ignition of photo SCR 1. In this case a luminous element 6 is not luminous due to a presence of inverter 7, and a phototransistor 5 is kept off. There works only a resistance RGK consequently between gate and cathode of SCR1, and hence it operates at high light ignition sensitivity from keeping the resistance RGK high. When input signal C does not work, the element 3 is not luminous but the element 6 gets luminous. The phototransistor 5 is therefore turned on, SCR1 is shortcircuited between cathode and gate, and thus dv/dt capacity is extremely improved. The dv/dt capacity can therefore be ketp high without deteriorating ignition sensitivity.

107. 发明专利

JPS54159159A SEMICONDUCTOR SWITCH CIRCUIT 失效
公开(公告)号：JPS54159159A
公开(公告)日：1979-12-15
申请号：JP6769878
申请日：1978-06-07
申请人： HITACHI LTD
发明人： SAGAWA AKIO , SUZUKI MASAYOSHI
IPC分类号： H02M1/08 , H03K17/16 , H03K17/73
摘要： PURPOSE:To increase the dv/dt rating while keeping high gate triggering sensitivity, by constituting the switch so that the transient current through the second junction can be supperssed even with steep transient voltage to PNPN switch. CONSTITUTION:Between the gate G and cathode K of PNPN switch 1, the electronic switch 3 is connected, and the transient current input terminal 51 of the capacitive element 5 is connected to the anode A of the switch 1, the transient current output terminal 52 to the control terminal 31 of the switch 3, and the change dischargin terminal 53 to the N base (N1) of the switch 1 respectively. Further, when steep forward voltage is between the anode A and the cathode K, the switch 3 is driven with the transient curent flowing the element 5 to avoid mis-firing. In this case, the charge stored to the element 5 trnsiently, discharges to N1 when the switch 1 is closed. Accordingly, the value of the element 5 is equivalently increased and the control current of the switch 3 is incresed, then the transient current flowing to the second junctions N1, P2 of the switch 1 is not incresed to increse the dv/dt rating.

108. 发明专利

JPS54133062A DRIVE CIRCUIT FOR SEMICONDUCTOR SWITCH 失效
公开(公告)号：JPS54133062A
公开(公告)日：1979-10-16
申请号：JP4037478
申请日：1978-04-07
申请人： HITACHI LTD
发明人： SAGAWA AKIO , SUZUKI MASAYOSHI
IPC分类号： H03K17/73 , H03K17/72
摘要： PURPOSE:To prevent mis-ignition even if rapid voltage is fed to the thyristor switch circuit, by making small the equivalent output static capacity of the gate drive constant current circuit, when the control switch is OFF. CONSTITUTION:The circuit provides the constant current circuit 10 driving the P gate of the semiconductor switch consisting of PNPN four layer construction, constant current circuit 20 driving the N gate of the semiconductor switch, control switch 30A provided at the power supply terminal of high potential of the circuit 10, and control switch 30 provided at the low potential power supply terminal of the circuit 20. Thus, the equivalent output static capacity of the circuit 10 and 20 is reduced, and when the circuits 30 and 30A are OFF, and if a rapid voltage is fed between the anode and cathode of the semiconductor switch, transient currents iGP and iGN can be decreased.

109. 发明专利

JPS54104274A DRIVER CIRCUIT OF FIELD EFFECT THYRISTOR 失效
公开(公告)号：JPS54104274A
公开(公告)日：1979-08-16
申请号：JP1048078
申请日：1978-02-03
申请人： HITACHI LTD
发明人： SAGAWA AKIO , SUZUKI MASAYOSHI
IPC分类号： H02M1/08
摘要： PURPOSE:To obtain a driver circuit which can drive a field effect thyristor even in a floating state, by keeping a gate-cathode control voltage constant making use of a constant current source as a gate driving source. CONSTITUTION:Constant-current generating circuits 40 and 50 are connected together via resistance 30 and when constant current IG is generated, a voltage between gate G and cathode K becomes the product of resistance value RGK of resistance 30 and constant current IG and field effect thyristor 1 becomes unconductive. Stopping current IG makes a G-K voltage zero, so that thyristor 1 will become conductive. Since two constant current generating circuits are used in this way, there is no influence to the main circuit side and even if the field effect thyristor is in a floating state, a control signal of a constant voltage can be applied between the gate and cathode, so that reliable switching can be attained.

110. 发明专利

JPS5478070A DRIVING SYSTEM OF OPTICAL SEMICONDUCTOR SWITCH 失效
公开(公告)号：JPS5478070A
公开(公告)日：1979-06-21
申请号：JP14504677
申请日：1977-12-05
申请人： HITACHI LTD
发明人： SAGAWA AKIO , SUZUKI MASAYOSHI
IPC分类号： H02M1/08 , H02M1/092
摘要： PURPOSE:To prevent the ignition trouble generation between elements by giving a phase difference to pulses, which drive luminous elements, in an optical switch obtained by combining plural PNPN four-layer structure optical thyristors and plural semiconductor luminous elements which ignite these optical thyristors. CONSTITUTION:Control signals VSl to VSn to open and close an optical semiconductor switch group are applied to luminous elements 20 to 20 in chip 30, where plural optical semiconductor switch groups are integrated, through gate circuits 40-1 to 40-n. Simultaneously, pulse train generator circuit 50 which generates pulse outputs with phase difference is connected to gate circuits 40-1 to 40-n, and luminous elements 20 to 20 in chip 30 are caused to emit light with difference in respect to time. As a result, an ignition trouble can be prevented from being generated even in case of light leakage between switches.

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