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1. 发明专利

JPS59182624A Switch circuit 失效
标题翻译：开关电路
公开(公告)号：JPS59182624A
公开(公告)日：1984-10-17
申请号：JP5514383
申请日：1983-04-01
申请人： Hitachi Ltd , Hitachi Micro Comput Eng Ltd
发明人： SEKIGUCHI SATOSHI , KAWAMOTO MIKIHIKO , KATOU NORIHISA
IPC分类号： H01H47/00 , H03K17/18
CPC分类号： H03K17/18
摘要： PURPOSE:To use all switches of a switch circuit for interruption and switching of a signal transmission path by installing an LED to an input side of the switch circuit and lighting the LED without using the switch of the switch circuit itself. CONSTITUTION:A power supply as a control signal is applied to a coil L1 by turning on a switch S0. A current I1 flows also to an LEDD1 and a resistor R1 to light the LEDD1. Then, a switch S1 is turned on by a magnetic field generated from the coil L1 and a moving contact (c) of a switch S2 is changed over from a fixed contact (b) to a fixed contact (a). The coil L1 is energized by this circuit and the LEDD1 is lighted at the same time when the switches S1, S2 are activated, then the operating state of the switch circuit is confirmed by observing visually the light of the LEDD1.
摘要翻译：目的：使用开关电路的所有开关，通过将LED安装到开关电路的输入端并点亮LED而不使用开关电路本身的开关来中断和切换信号传输路径。构成：通过接通开关S0将作为控制信号的电源施加到线圈L1。电流I1也流向LEDD1和电阻器R1以点亮LEDD1。然后，开关S1由线圈L1产生的磁场导通，开关S2的移动触头（c）从固定触头（b）转换成固定触点（a）。线圈L1由该电路通电，并且在开关S1，S2被激活的同时LEDD1点亮，然后通过目视观察LEDD1的光来确认开关电路的工作状态。

2. 发明专利

JPS5637712A NEGATIVE FEEDBACK AMPLIFYING CIRCUIT 失效
公开(公告)号：JPS5637712A
公开(公告)日：1981-04-11
申请号：JP11286879
申请日：1979-09-05
申请人： HITACHI LTD , HITACHI OME ELECTRONIC CO
发明人： SEKI KUNIO , KATOU NORIHISA
IPC分类号： H03F1/34
摘要： PURPOSE:To prevent the difference of levels for the output clip waveform to the overinput, by providing a resistance between the both collectors of the differential amplifying transistors to flow only the AC signal. CONSTITUTION:The resistance R5 is provided between the both collectors of the differential transistors Q1 and Q2 in the 1st-stage amplifying circuit of the power IC. As a result, the open loop gain can be reduced, and accordingly no difference of levels is caused for the output signal and to the overinput when the output voltage is clipped. Thus the resping clip noise can be eliminated, and furthermore the occurrence of the AM disturbance can be prevented for the radio receiver or the like.

3. 发明专利

JPS6016007A GAIN VARIABLE CIRCUIT 失效
公开(公告)号：JPS6016007A
公开(公告)日：1985-01-26
申请号：JP12326983
申请日：1983-07-08
申请人： HITACHI MICROCUMPUTER ENG , HITACHI LTD
发明人： KATOU NORIHISA , TAKESHITA RITSUJI
IPC分类号： H03G7/00
摘要： PURPOSE:To increase the dynamic range and also to obtain an output signal of a low distortion factor by constituting plural stages of a diode load of a gain adjusting circuit and also constituting the amplifier characteristic of an amplifier circuit so as to provide the logarithmic characteristic. CONSTITUTION:Transistors (TR)Q1, Q2 constituted as a differential pair conduct voltage-current conversion. Then a DC voltage E1 and a resistor R1 decide a bias voltage of the TRQ1. Thus, a voltage E1 and an input signal V1 are applied superimposingly to a base of the TRQ1. Further, n-sets of diodes Dn1 connected in series are activated as a load circuit of the TRQ1 and n-sets of diodes Dn2 are operated as a load circuit of the TRQ2 so as to form the amplifier characteristic into a logarithmic characteristic. The gain adjustment of a gain adjusting circuit 2 is conducted by current supply amount of the current control circuits 2a, 2b. Then in increasing/decreasing a current i13 by the control of a current control circuit 3a, the charging current to a capacitor C1 is controlled and the frequency characteristic of an output signal V011 is adjusted by the charging time and discharging time based on the capacitance of the capacitor C1.

4. 发明专利

JPS5662408A AUDIO AMPLIFIER 失效
公开(公告)号：JPS5662408A
公开(公告)日：1981-05-28
申请号：JP13765879
申请日：1979-10-26
申请人： HITACHI LTD
发明人： KATOU NORIHISA
IPC分类号： H03F1/00 , H03F1/30
摘要： PURPOSE:To reduce the production of pop sound at the reapplication of power supply, by providing an reverse current blocking circuit with a transistor which keeps the output potential for a given time at ''0'' to reduce the production of pop sound at the application of power supply. CONSTITUTION:When a power switch SW is closed, driving transistors Q6, Q7 are also conductive since transistors Q12, Q13 are conductive. Thus, transistors Q8, Q9 at the push-pull output stage are conductive to keep the output voltage to ground level. When the charging of a capacitor C2 advances, the base potential of Q12, Q13 is increased to keep the transistors of both uonconductive. When SW is open, the base potential of Q 2 os slowly lowened than that of Q1 with the operation of an reverse current remains ground level. In this case, no output is produced until Q1 and Q2 are balanced even if power supply is reapplied.

5. 发明专利

JPS60152109A AMPLIFIER CIRCUIT 失效
公开(公告)号：JPS60152109A
公开(公告)日：1985-08-10
申请号：JP721484
申请日：1984-01-20
申请人： HITACHI MICROCUMPUTER ENG , HITACHI LTD
发明人： KATOU NORIHISA , TAKESHITA RITSUJI
IPC分类号： H03F1/52 , H03F1/42 , H03G3/02 , H03G3/10
摘要： PURPOSE:To stop surely the amplifier operation and also to prevent the fluctuation of a bias voltage by controlling an electronic variable resistor with a thermal shut-down circuit so as to block signal transmission. CONSTITUTION:An input signal Vin is subjected to class A amplification and class B push-pull amplification at the normal state, outputted from a speaker SP and a DC level at a terminal 3 is Vcc/2. When an IC chip reaches a high temperature, since a base-emitter voltage VBE of a transistor (TR)Q9 has a negative temperature coefficient, the VBE is decreased and the TRQ9 is turned on regardless that a bias voltage VB is constant and since the input signal Vin is divided by a resistor R4 and the TRQ9, the amplification operation by a TRQ1 is not conducted. In this case, since the DC potential of the base of the TRQ1 is the same as that at the steady state and a common potential, the entire bias is unchanged and the oscillation due to bias fluctuation is not caused.

6. 发明专利

JPS6016006A GAIN VARIABLE CIRCUIT 失效
公开(公告)号：JPS6016006A
公开(公告)日：1985-01-26
申请号：JP12326883
申请日：1983-07-08
申请人： HITACHI MICROCUMPUTER ENG , HITACHI LTD
发明人： KATOU NORIHISA
IPC分类号： H03G9/00 , H03G5/02
摘要： PURPOSE:To adjust easily a gain and a frequency characteristic by providing a control section controlling an output level of a gain adjusting circuit and controlling the frequency characteristic of a frequency characteristic adjusting circuit so as to control a control signal applied to this control section. CONSTITUTION:An input signal V1 is superimposed on a DC voltage E1 and the result is applied to a base of a transistor (TR)Q1. Further, resistors R2, R3 are provided to adjust the region where TRs Q1, Q2 are operated as a differential amplifier. Further, diodes D1, D2 conducts a curent-voltage converting operation and decides a voltage level at a point (a) to a prescribed value. Moreover, current control circuits 2a, 2b control currents i1, i2 flowing to the diodes D1, D2. Then in increasing/decreasing a current i13 by the control of a current control circuit 3a, the charging current of a capacitor C1 is controlled. The frequency characteristic of an output signal V011 is adjusted by the charging time and discharge time based on the capacitor C1.

7. 发明专利

JPS60152108A AMPLIFIER CIRCUIT 失效
公开(公告)号：JPS60152108A
公开(公告)日：1985-08-10
申请号：JP709984
申请日：1984-01-20
申请人： HITACHI LTD , HITACHI MICROCUMPUTER ENG
发明人： TAKESHITA RITSUJI , KATOU NORIHISA
IPC分类号： H03F1/52 , H03F1/42
摘要： PURPOSE:To protect a power supply side output transistor (TR) and a resistor between a current and a bootstrap capacitor by detecting fluctuation of power supply so as to interrupt the current path of said resistor. CONSTITUTION:An input signal Vin is applied to a circuit I conducting class A voltage amplification and class B current amplification via an operational amplifier 1, where the signal is power-amplified and outputted, and when a power supply is normal, an overvoltage detecting TRQ1 is turned off and control TRs Q21-Q23 are turned off and power supply side output TRs Q8, Q9 and common side output TRs Q10, Q11 are driven. If a surge is mixed to the power supply, the overvoltage detection TRQ1 is turned on and the TRs Q2, Q21-Q23 are turned on, the TRs Q3, Q4 are turned off and since no current flows to a bootstrap resistor R6, no heat dissipation is caused. Moreover, the TRs Q5-Q9 are all turned off and the destruction of the output TRs is prevented.

8. 发明专利

JPS5793708A POWER AMPLIFIER 失效
公开(公告)号：JPS5793708A
公开(公告)日：1982-06-10
申请号：JP16961580
申请日：1980-12-03
申请人： HITACHI LTD , HITACHI MICROCUMPUTER ENG
发明人： SEKI KUNIO , KATOU NORIHISA
IPC分类号： H03F3/68 , H03F3/30
摘要： PURPOSE:To improve the response to the application of a power supply, by connecting a load between output terminals of a pair of amplifiers in which the respective output signal of a signal source circuit is applied to the input. CONSTITUTION:Since a positive half wave output signal V01 to be amplified is outputted to a (10) terminal when a positive half wave signal Vi1 is applied, a load RL is driven with the amplified positive half wave output signal V01. When a negative half wave signal Vi2 is applied, since an amplified negative half wave output signal V02 is outputted from a (7) terminal, although a neutral point DC voltage is outputted to the (10) terminal, the load RL is driven with the amplified negative half wave output signal V02. Since the load RL is driven with the differential amplifying output signal by Amp1, Amp2, an audio output signal synthesized can be obtained from the load RL.

9. 发明专利

JPS5656013A NEGATIVE FEEDBACK AMPLIFICATION OUTPUT CIRCUIT 失效
公开(公告)号：JPS5656013A
公开(公告)日：1981-05-16
申请号：JP13187479
申请日：1979-10-15
申请人： HITACHI LTD
发明人： SEKI KUNIO , KATOU NORIHISA
IPC分类号： H03F1/34 , H03F1/48
摘要： PURPOSE:To reduce no-signal current and to improve voltage-gain-to-frequency characteristics by compensating a decrease in equivalent impedance across a DC- stopping capacitor in a negative feedback circuit at a reduced frequency by inserting a resistance in series into the capacitor. CONSTITUTION:Resistance R4 is inserted in series into capacitor C2 of the AC feedback circuit for low-frequency characteristic improvement, and consequently an equivalent decrease in impedance across capacitor C2 at a reduced frequency can be compensated. Thus, a feedback signal is obtained from the load side of coupling capacitor C1 and while an increase in no-signal current (DC current) by the negative feedback circuit is stopped, frequency characteristics are improved.

10. 发明专利

JPS55143809A PUSHHPULL CIRCUIT 失效
公开(公告)号：JPS55143809A
公开(公告)日：1980-11-10
申请号：JP5027379
申请日：1979-04-25
申请人： HITACHI LTD , HITACHI OME ELECTRONIC CO
发明人： SEKI KUNIO , KATOU NORIHISA
IPC分类号： H03F3/18 , H03F3/20 , H03F3/213 , H03F3/30
摘要： PURPOSE:To prevent degradation of the distortion rate dependent upon secondary higher harmonic and so on, by constituting a circuit, by which positive and negative half-wave outputs are obtained, as an inverted Darlington output circuit practically. CONSTITUTION:The output of amplifying transistor TRQ3 which forms the class A amplification output signal of an input signal is input to the base of driving transistor TRQ2 in the side where a negative half-wave output is formed, and the output of amplifying TRQ5 which forms the class A amplification output signal of an input signal, which is level-shifted in level shift circuits Q6 and Q7, is inverted through the current Miller circuit constituted by npn TRQ8 and Q9 and is input to the base of driving transistor TRQ1 in the side where a positive half-wave output is formed. For bias set of TRQ2, diode-connected TRQ10 is provided between the base of TRQ2 and the common emitter of TRQ8 and Q9, and constant-current circuit I02 is provided for the common emitter of TRQ8 and Q9, and constant-current circuit I01 is provided in the collector side of TRQ8. As a result, degradation of the distortion rate dependent upon the secondary higher harmonic and so on can be prevented.

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