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1. 发明专利

JPH09298430A AMPLIFIER CIRCUIT CONFIGURED INTO INTEGRATED CIRCUIT 失效
公开(公告)号：JPH09298430A
公开(公告)日：1997-11-18
申请号：JP11232096
申请日：1996-05-07
申请人： HITACHI LTD , HITACHI MICROCOMPUTER SYST
发明人： NISHIMURA KENJI , ISHIHARA MASAHIRO , SEKI KUNIO
IPC分类号： H02P25/06 , H03F3/68 , H02P5/00
摘要： PROBLEM TO BE SOLVED: To reduce the gain peak of a current by deviating the ratio of an input resistance to a feedback resistance in an inductive load driving amplifier circuit by a prescribed degree so as to omit connection of an externally mounted capacitor of a prescribed capacitance or over. SOLUTION: A differential amplifier PA2 receives an output of a differential amplifier PA1 at its inverting input terminal via a resistor R and has a gain of -1. The amplifier PA1, PA2 drive a VCM coil L acting like an inductive load connecting between output pins Po1 and Po2, a current Io flowing to the coil L is sensed by a current sensing resistor Rs to feed back a current to the differential amplifiers PA1, PA2. A resistor R5 with a very small resistance to reduce a gain peak is inserted between a feedback resistor R4 and a sense pin Ps. The current Io flowing to the coil is expressed as (R2/R1).(Vin-Vref)/ Rs, which is independent of the impedance of the coil.

2. 发明专利

JPH099663A MOTOR CONTROLLER 失效
公开(公告)号：JPH099663A
公开(公告)日：1997-01-10
申请号：JP15194295
申请日：1995-06-19
申请人： HITACHI LTD
发明人： SEKI KUNIO , TSUNODA TOSHIYUKI , OKUBO YUICHI
IPC分类号： G11B19/28 , G11B19/247 , H02P29/00 , H03L7/093 , H02P5/00
摘要： PURPOSE: To make it possible to change the rotational speed of a motor securing high-stability high-precision control operation by performing setting changing at least one of the magnitude of a changing/discharging current to a capacitor element and a transfer gain in a feedback, in accordance with signals from outside. CONSTITUTION: When a charging/discharging current in a charging pump circuit 19 is made larger (smaller), the terminal voltage of a capacitor element C1 to a frequency error i.e., the response of a DC voltage ΔV becomes quicker (slower), and an effect similar to the decrease (increase) of the capacity value of the capacitor element C1 is obtained. Similarly, the response characteristic of a quantity-of-drive control signal A.ΔV to be transmitted to a motor drive circuit 10 changes, if a transfer gain in a variable-gain amplifier 20 is changed. By doing this way, it becomes possible to change the transfer characteristic in a control system only by the operation of setting by an electric signal Sx, without changing the value of the capacitor element C1 hard to semiconductor- integrated-circuitized. It becomes possible to change the rotational speed of a motor, securing high-stability high-precision control operation.

3. 发明专利

JPH08223968A MOTOR 失效
公开(公告)号：JPH08223968A
公开(公告)日：1996-08-30
申请号：JP2972095
申请日：1995-02-17
申请人： HITACHI LTD
发明人： SEKI KUNIO , TSUNODA TOSHIYUKI , OKUBO YUICHI
IPC分类号： H02K29/00 , H02K29/08 , H02P6/06 , H02P6/08 , H02P6/16
摘要： PURPOSE: To obtain position reference information for every revolution of each phase motor by differentiating the amount of the flux of one pole in a rotor from others and generating the position reference information, i.e., an index signal, for every revolution of a motor based on the amplitude of output waveform from a pole sensor subjected to level stabilization. CONSTITUTION: A plurality of poles 11a arranged circularly around the rotor 11 of a motor 1 includes one specific electrode 11b having an amount of the flux reduced as compared with other poles within such range as causing no trouble in driving the motor. An AGC circuit 24 stabilizes the output from each Hall element Hu, Hv, Hw through gain control for a sensor amplifier 21. An index circuit 3 discriminates the level of one Wi of detection outputs Ui, Vi, Wi subjected to level stabilization through the AGC circuit 24 using a predetermined threshold value Vth 1 and produces an index pulse E every time when the specific pole 11b makes a single revolution and passes one specific angle.

4. 发明专利

JPH07245988A LOW VOLTAGE LOSS DRIVER 失效
公开(公告)号：JPH07245988A
公开(公告)日：1995-09-19
申请号：JP3043494
申请日：1994-02-28
申请人： HITACHI LTD , HITACHI MICOM SYST KK
发明人： NISHIMURA KENJI , SEKI KUNIO
IPC分类号： G11B21/02 , H02P7/00 , H02P25/06
摘要： PURPOSE:To make it possible to reduce both of the upper and lower side output saturation voltages of a driver, by transmitting the output voltage of an input circuit to an output terminal with a voltage drop equivalent to a base-emitter voltage of one transistor, and shifting it to the reference potential side within a range smaller than the base-emitter voltage. CONSTITUTION:An output terminal 5 is driven H or L through an output circuit 4. A bias circuit 8 feeds the emitter of a lower side driving transistor Q11 with a potential obtained by shifting the output voltage Vo of the output terminal 5 to the upper side of a base-emitter voltage of one transistor. When a proper value is selected for the value of a resistor R1 in a level adjusting circuit 9, the level of output voltage Va input from an input circuit 1 to a lower side drive circuit 3 is the minimum value of the sum of lower side output saturation voltage at the time of L output and upper side output saturation voltage at the time of H output. This makes it possible to set the output voltage Vo at the time of H or L output to the optimum level without changing the number of transistors for causing voltage drop in the bias circuit 8.

5. 发明专利

JPS644103A FEEDBACK TYPE AMPLIFIER 失效
公开(公告)号：JPS644103A
公开(公告)日：1989-01-09
申请号：JP15771087
申请日：1987-06-26
申请人： HITACHI LTD , HITACHI MICROCUMPUTER ENG
发明人： SEKI KUNIO , YAMADA SHINJI , ISHII HIROBUMI
IPC分类号： H03F3/343 , H03F1/34 , H03F3/34 , H03F3/347
摘要： PURPOSE:To decrease the capacitance of a phase compensation capacitor by providing a current mirror circuit shutting an output current of a preamplifier by a prescribed current ratio so as to use a current shunted to 1/n thereby driving a feedback circuit. CONSTITUTION:An output voltage V0 of a preamplifier 1 is fed to an emitter of a transistor(TR) Qa being a component of a current mirror circuit 3. The TR Qa is of double collector constitution and the area ratio of collectors C1, c2 is set to n:1. In receiving the output voltage V0, a drive current Iout of 1/n is fed to a base of a TR Q7. In other words, the mutual conductance gm of the preamplifier 1 is reduced to 1/n. In this case, the phase compensation capacitor C0 is expressed in equation I. On the other hand, the phase compensation capacitor C0 in driving the TR Q7 by the output voltage V0 is deterdmined by equation II. In comparing the equations I, II, the phase compensation capacitor C0 is selected to a capacitance of 1/(n+1) by providing the current mirror circuit 3.

6. 发明专利

JPS63228803A PROTECTING CIRCUIT 失效
公开(公告)号：JPS63228803A
公开(公告)日：1988-09-22
申请号：JP6095487
申请日：1987-03-18
申请人： HITACHI LTD , HITACHI MICROCUMPUTER ENG
发明人： SEKI KUNIO , MOCHIZUKI HIROTAKA
IPC分类号： H03F1/52 , H03F1/42
摘要： PURPOSE:To surely protect transistors, IC, etc., by comparing a reference voltage level with an abnormal voltage level of an output terminal and accelerating a normal abnormality detecting action and its resulting protecting action by means of the output signal obtained when the abnormality is detected. CONSTITUTION:A terminal #1 is connected to a power supply VCC as shown by a dotted line by some unexpected factor. In such a case, an output current Io is not regulated by a load coil RL and a large current flows to a transistor TR Q1. At the same time, the collector voltage Vo is set at the same level as the VCC. Thus, the voltage VB rises up to satisfy Vref1

7. 发明专利

JPS6324322B2 失效
公开(公告)号：JPS6324322B2
公开(公告)日：1988-05-20
申请号：JP686980
申请日：1980-01-25
申请人： HITACHI LTD
发明人： TAKESHITA RITSUJI , SEKI KUNIO
IPC分类号： H03F1/52 , H02H7/20 , H03F1/42

8. 发明专利

JPS62241411A CURRENT DRIVING AMPLIFIER 失效
公开(公告)号：JPS62241411A
公开(公告)日：1987-10-22
申请号：JP8415286
申请日：1986-04-14
申请人： HITACHI LTD , HITACHI MICROCUMPUTER ENG , HITACHI TOBU SEMICONDUCTOR LTD
发明人： SEKI KUNIO , ISHII HIROBUMI , SASAKI TAKASHI
IPC分类号： H03F3/68
摘要： PURPOSE:To obtain high current driving ability, to realize two-way current driving, and to perform accurate control by constituting a voltage-current conversion type current driving amplifier of BTL(Balanced Transformerless) constitution by using two negative feedback amplifiers, and putting a load in the negative feedback path of one amplifier. CONSTITUTION:The BTL circuit consists of the two amplifiers 1 and 2 and a coil L which is, for example, an inductive load is driven with a current. An input signal Vin is supplied to the inverted input terminals of operational amplifiers 1 and 2 in common through a resistance R1. A reference voltage Vref is supplied to the uninverted input terminals in common. Therefore, an output current I0 is determined by I0=-R2+R3/RsR1. (Vin-Vref). In said equation, a varying component is only an input signal Vin, so the output current I0 varies corresponding to the voltage level of the input signal Vin. The output current I0 flows through the coil L, but the amplifiers 1 and 2 are small in output imped ance and the current flows in both ways as shown by an arrow according to the change in the polarity of the input signal Vin.

9. 发明专利

JPS62225129A LOAD DRIVING CIRCUIT WITH PROTECTIVE CIRCUIT 失效
公开(公告)号：JPS62225129A
公开(公告)日：1987-10-03
申请号：JP6576886
申请日：1986-03-26
申请人： HITACHI LTD , HITACHI MICROCUMPUTER ENG
发明人： SEKI KUNIO , MOCHIZUKI HIROTAKA
IPC分类号： G05F1/10 , H02H7/00 , H03K17/08

10. 发明专利

JPS62224059A TEMPERATURE DETECTION CIRCUIT FOR SEMICONDUCTOR DEVICE 失效
公开(公告)号：JPS62224059A
公开(公告)日：1987-10-02
申请号：JP6576686
申请日：1986-03-26
申请人： HITACHI LTD , HITACHI MICROCUMPUTER ENG
发明人： SEKI KUNIO , MOCHIZUKI HIROTAKA
IPC分类号： H01L21/66 , H01L27/02 , H03F1/42 , H03F1/52
摘要： PURPOSE:To reduce the error of an operating point for detecting a temperature by a transistor by varying a voltage level obtained from a voltage division circuit utilizing pinch resistance in response to the dispersion of the current amplification factor (hfe) of the transistor detecting the temperature. CONSTITUTION:A bias circuit 11 supplies a transistor Q11 with stable bias voltage Va in a voltage division circuit 1, and stabilizes currents I1 flowing through the transistor Q11. A resistor Ra constituted of a pinch resistor Rp and resistors R11, R12 is fitted as a voltage division resistor together with a resistor Rb, transistors Q12, Q13 are mounted as shift registers, and the pinch resistor Rp is shaped by the same process as the diffusion of a base and an emitter for a transistor Q21. Pinch resistance Rp is increased and voltage Va is brought to a low level when the hfe of the transistor Q21 is large, and pinch resistance Rp is reduced and voltage Va is brought to a high level when the hfe of the transistor Q21 is small. Accordingly, an error on the detection of a temperature is minimized, thus positively protecting a semiconductor device.

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