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91. 发明专利

JPS63160263A PROTECTIVE CIRCUIT 失效
公开(公告)号：JPS63160263A
公开(公告)日：1988-07-04
申请号：JP30647186
申请日：1986-12-24
申请人： HITACHI LTD , HITACHI MICROCUMPUTER ENG
发明人： SEKI KUNIO , MOCHIZUKI HIROTAKA
IPC分类号： H03F1/52 , H01L23/58 , H03F1/42
摘要： PURPOSE:To prevent any overcurrent from running in while reducing the IC breakdown by a method wherein a current limiting means substantially cutting off a power supply or limiting current is provided between the power supply and an inner circuit in IC in case the power supply is subjected to any polarity inversion. CONSTITUTION:A current limiting means is composed of a transistor T connected to a base and an emitter E as well as a P type resistance layer formed in an N type island region on a P type substrate. When power supply VCC is in normal polarity, TQ1 actuates the emitter E and a collector C in the reverse direction while a constant voltage circuit 1 is supplied with power supply current to supply TQ2 with bias voltage by a Zener diode ZD for supplying the reference voltage Vref divided by R2, R3. Furthermore, when the power supply VCC is erroneously connected, the TQ1 reaches non conductive state due to zero bias between the base B and emitter E of TQ1 so that the constant voltage circuit 1 may be supplied with no overcurrent to protect IC without fail.

92. 发明专利

JPS62226654A SEMICONDUCTOR DEVICE 失效
公开(公告)号：JPS62226654A
公开(公告)日：1987-10-05
申请号：JP6838686
申请日：1986-03-28
申请人： HITACHI LTD , HITACHI MICROCUMPUTER ENG , HITACHI COMMUNICATION SYSTEM
发明人： SEKI KUNIO , ISHII HIROBUMI , SATONAKA KOICHIRO , SHINDO YOSHIMI , MASUKO TAKESHI
IPC分类号： G05F3/16 , H01L21/822 , H01L27/04 , H03F3/34 , H03F3/347
摘要： PURPOSE:To form an electronic circut for effecting desiring circuit operations and to reduce operating errors due to a parasitic current by presetting the base potential level of a part or the whole of the electronic circuit formed in a semiconductor substrate to be higher than the earthing level. CONSTITUTION:A control circuit 4 controls a quantity of current of motor drive currents I1-I6 by a control signal Vs and accordingly controls a rotation velocity of a motor. A diode D1 is arranged between an earthing line l1 and an earthing point of the control circuit 4. A diode D is a parasitic diode and when a motor drive current is cut off, a parasitic element Q100 of an output circuit 3 gets into an on-state by a counter-electromotive force and a potential of an earthing line l2 increases by a parasitic current. Then, as if the control signal Vs were supplied to the circuit 4 through the diode D. However, the diode D1 prevents an influence of the parasitic current. Also, as there is a difference in voltage between the earthing line l1 and a signal transmission course, the circuit 4 is not operated by error before the potential of the earthing line l2 increases over the sum of a forward voltage and the voltage difference.

93. 发明专利

JPS62224104A AMPLIFIER CIRCUIT 失效
公开(公告)号：JPS62224104A
公开(公告)日：1987-10-02
申请号：JP6577286
申请日：1986-03-26
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 reduce the power consumption by driving selectively the 1st output circuit receiving the 1st power voltage depending on the level of a transmission signal and the 2nd output circuit receiving the 2nd power voltage lower than the level of the 1st power voltage. CONSTITUTION:A transistor (TR) Q1 is turned on by a reference voltage Vref when the transmission signal Vin is at a low level and a push-pull output circuit of low power voltage drive is operated by using the 2nd power supply output circuits Q13, Q14 and ground side output circuits Q15, Q16 with a detection signal obtained from a TR Q4. When the transmission signal V1 is at a high level, the emitter potential of the TRs Q1, Q2 rise to turn off the TR Q1 and to turn on a TR Q2, and the 1st power supply side output circuits Q11, Q12 are driven by the detection signal obtained from a TR Q5. Thus, the output circuit with different power voltage is driven corresponding to the transmission signal level change to decrease the power consumption.

94. 发明专利

JPS6217889B2 失效
公开(公告)号：JPS6217889B2
公开(公告)日：1987-04-20
申请号：JP1836279
申请日：1979-02-21
申请人： HITACHI LTD
发明人： SEKI KUNIO
IPC分类号： H03F3/20 , H03F3/30

95. 发明专利

JPS6211525B2 失效
公开(公告)号：JPS6211525B2
公开(公告)日：1987-03-13
申请号：JP1836179
申请日：1979-02-21
申请人： HITACHI LTD
发明人： SEKI KUNIO
IPC分类号： H03F1/30

96. 发明专利

JPS6211375B2 失效
公开(公告)号：JPS6211375B2
公开(公告)日：1987-03-12
申请号：JP15985378
申请日：1978-12-27
申请人： HITACHI LTD
发明人： SEKI KUNIO
IPC分类号： G05F1/613 , G05F1/56 , G05F1/618

97. 发明专利

JPS61154492A MOTOR CONTROL CIRCUIT 失效
公开(公告)号：JPS61154492A
公开(公告)日：1986-07-14
申请号：JP27310284
申请日：1984-12-26
申请人： HITACHI LTD , HITACHI MICROCUMPUTER ENG
发明人： SEKI KUNIO , ISHII HIROBUMI
IPC分类号： H02P7/288 , H02P5/168
摘要： PURPOSE:To accurately control the rotating speed by charging and discharging a capacitor for obtaining the prescribed output voltage by the outputs of two counters which operates independently. CONSTITUTION:A frequency signal f1 from a frequency generator (FG)1a becomes output signals VQ1, VQ1 through a waveform shaper 2 and 1/2 frequency divider 3. Trigger signal generator 4 , 4 generate trigger signals VT1, VT2. The first and second counters 5 , 5 counts clock signal CLK synchronously with the rising edges of the signals VT1, VT2. This counting operation is always constant. A capacitor C1 is controlled to be charged and discharged through a NOR circuit 8, an AND circuit 9 and transistors Q1-Q3 by the combination of the level changes of the output signals of the first and second counters 5 , 5 . The rotating speed of the motor is controlled by the output signal of a capacitor C1.

98. 发明专利

JPS6119130B2 JPS6119130B2 - 失效
公开(公告)号：JPS6119130B2
公开(公告)日：1986-05-15
申请号：JP8190478
申请日：1978-07-07
申请人： Hitachi Ltd
发明人： SEKI KUNIO
IPC分类号： H03F1/00 , H03F1/42 , H03F1/52 , H03F3/343
CPC分类号： H03F3/343

99. 发明专利

JPS60109315A DRIVING CIRCUIT 失效
公开(公告)号：JPS60109315A
公开(公告)日：1985-06-14
申请号：JP21616183
申请日：1983-11-18
申请人： HITACHI LTD
发明人： SEKI KUNIO , HORIUCHI KENJI
IPC分类号： H03F3/21 , H03F3/20 , H03F3/213 , H03G3/20 , H03G3/30
摘要： PURPOSE:To reduce the power consumption of a driving circuit by detecting the output current flowing through an output transistor (TR) and controlling the base current supplied to the output TR. CONSTITUTION:A switch signal VS for turning on and off the output TRQ6 is supplied to a terminal 1. When the signal VS impressed to a TRQ3 is lower than a reference voltage VREF1, the TRQ3 turns on and the TRQ6 is driven into its saturation region. When an output current I0 is large, a detection voltage VX rises in level. Then, the current I2 flowing through a TRQ2 increases and the base current of the TRQ6 also increases.

100. 发明专利

JPS60106387A CONTROL CIRCUIT FOR MOTOR 失效
公开(公告)号：JPS60106387A
公开(公告)日：1985-06-11
申请号：JP21081383
申请日：1983-11-11
申请人： HITACHI LTD
发明人： SEKI KUNIO
IPC分类号： H02P6/08 , H02P6/06
摘要： PURPOSE:To control a motor at high efficiency and low power consumption by controlling the energizing sequence on the basis of a rotating position detection signal and the energizing time on the basis of the rotating position detection signal and a control voltage. CONSTITUTION:Rotating position detection signals from Hall elements H1-H3 are supplied through voltage/current converters 2-4 to a matrix circuit 5. The matrix circuit 5 outputs a drive signal to drive circuits 6-8 in response to the input signal. A zero cross position detector 1 conducts a transistor Q21 at every zero crossing position of the position detection signals Uv-Wv and generates a sawtooth voltage Vs from a capacitor C1. A voltage comparator 12 compares the rotating speed control voltage Vc' with the voltage Vs and controls the energizing time of the drive circuits 6-8.

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