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    • 2. 发明申请
    • Infrared transmitter circuit and electronic device
    • 红外发射机电路和电子设备
    • US20050089337A1
    • 2005-04-28
    • US10968884
    • 2004-10-21
    • Hiroaki ItohNaruichi YokogawaTakeshi NishinoRyosuke Kawashima
    • Hiroaki ItohNaruichi YokogawaTakeshi NishinoRyosuke Kawashima
    • H03K17/78H04N5/00H04B10/04
    • H04B10/1141
    • An infrared transmitter circuit causes an output current to flow to a light emission diode via a current mirror circuit constituted of three transistors by using a current supplied from a power source circuit, so that the light emission diode emits light. When a voltage V1 varied by charging a capacitor with a current flowing from the power source circuit exceeds a reference voltage (voltage V2), an output of a comparator resets a D flip-flop, so that an output of the D flip-flop varies to “0”. Thus, an output of a NAND gate to which that output and a transmission signal are inputted causes a transistor (N-channel FET) to turn ON so as to stop operation of the current mirror circuit, and causes a transistor (P-channel FET) to turn OFF so as to cut a connection between the power source circuit and a power source line. Thus, it is possible to reduce power consumption in operation of a protection circuit which stops supplying the output current to the light emission diode.
    • 红外发射电路通过使用从电源电路提供的电流,通过由三个晶体管构成的电流镜电路使输出电流流到发光二极管,使得发光二极管发光。 当通过从电源电路流过的电流对电容器充电而电压V 1超过参考电压(电压V 2)时,比较器的输出复位D触发器,使得D触发器的输出, 翻牌变为“0”。 因此,输入和发送信号的NAND门的输出使得晶体管(N沟道FET)导通,以停止电流镜电路的工作,并且使晶体管(P沟道FET )以切断电源电路和电源线之间的连接。 因此,可以在停止向发光二极管供给输出电流的保护电路的工作中降低功耗。
    • 3. 发明授权
    • Infrared transmitter circuit and electronic device
    • 红外发射机电路和电子设备
    • US07359649B2
    • 2008-04-15
    • US10968884
    • 2004-10-21
    • Hiroaki ItohNaruichi YokogawaTakeshi NishinoRyosuke Kawashima
    • Hiroaki ItohNaruichi YokogawaTakeshi NishinoRyosuke Kawashima
    • H04B10/04H01S3/00
    • H04B10/1141
    • An infrared transmitter circuit causes an output current to flow to a light emission diode via a current mirror circuit constituted of three transistors by using a current supplied from a power source circuit, so that the light emission diode emits light. When a voltage V1 varied by charging a capacitor with a current flowing from the power source circuit exceeds a reference voltage (voltage V2), an output of a comparator resets a D flip-flop, so that an output of the D flip-flop varies to “0”. Thus, an output of a NAND gate to which that output and a transmission signal are inputted causes a transistor (N-channel FET) to turn ON so as to stop operation of the current mirror circuit, and causes a transistor (P-channel FET) to turn OFF so as to cut a connection between the power source circuit and a power source line. Thus, it is possible to reduce power consumption in operation of a protection circuit which stops supplying the output current to the light emission diode.
    • 红外发射电路通过使用从电源电路提供的电流,通过由三个晶体管构成的电流镜电路使输出电流流到发光二极管,使得发光二极管发光。 当通过从电源电路流过的电流对电容器充电而电压V 1超过参考电压(电压V 2)时,比较器的输出复位D触发器,使得D触发器的输出, 翻牌变为“0”。 因此,输入和发送信号的NAND门的输出使得晶体管(N沟道FET)导通,以停止电流镜电路的工作,并且使晶体管(P沟道FET )以切断电源电路和电源线之间的连接。 因此,可以在停止向发光二极管供给输出电流的保护电路的工作中降低功耗。
    • 6. 发明申请
    • Receiving circuit and electronic apparatus for optical communication
    • 光通信接收电路和电子设备
    • US20060008280A1
    • 2006-01-12
    • US11175340
    • 2005-07-07
    • Naruichi YokogawaTakeshi Nishino
    • Naruichi YokogawaTakeshi Nishino
    • H04B10/06
    • H04B10/114
    • In an optical communication-use receiving circuit of the present invention, the pulse width of the received pulse which is a binary signal corresponding to the signal optical pulse is specified by using an integration circuit and a trigger generating circuit. If the pulse width of the received pulse is not shorter than a predetermined value, a signal having a fixed pulse width is outputted as an output signal from a one-shot pulse generating circuit, so that a pulse having a constant pulse width corresponding to the specified communication speed is outputted. Accordingly, if the pulse width deriving from the signal optical pulse is larger than a certain value, the communication is deemed as a low-speed communication, and a pulse having a constant pulse width corresponding to the communication speed is outputted. As a result, it is possible to realize a small-size receiving circuit and a small-size electronic device which require no external switching-over terminal.
    • 在本发明的光通信用接收电路中,通过使用积分电路和触发发生电路来规定作为与信号光脉冲对应的二进制信号的接收脉冲的脉冲宽度。 如果接收脉冲的脉冲宽度不小于预定值,则从单触发脉冲发生电路输出具有固定脉冲宽度的信号作为输出信号,使得脉冲宽度对应于 输出指定的通信速度。 因此,如果从信号光脉冲导出的脉冲宽度大于一定值,则通信被认为是低速通信,并且输出具有与通信速度对应的恒定脉冲宽度的脉冲。 结果,可以实现不需要外部切换端子的小尺寸接收电路和小型电子设备。
    • 7. 发明授权
    • Charge and/or discharge circuit, and carrier detector circuit using same
    • 充电和/或放电电路,以及使用其的载波检测器电路
    • US06677732B1
    • 2004-01-13
    • US10189396
    • 2002-07-08
    • Takahiro InoueNaruichi YokogawaTakeshi Nishino
    • Takahiro InoueNaruichi YokogawaTakeshi Nishino
    • H01M1046
    • H04B10/69H04L27/06
    • A charge/discharge circuit creates a carrier detection level based on a received signal in a carrier detector circuit for detecting the presence or absence of a carrier in such applications as a receiver for an IR remote controller. The charge/discharge circuit operates to amplify a current, that is produced in n-type transistors QN1, QN2, QN3 and a reference current source, in a p-type transistor QP1. The amplified current is mirrored by a current mirror circuit to be supplied as an emitter current of a p-type transistor QP2. The charge/discharge circuit charges a capacitor with a small current, i.e., a base current of the p-type transistor QP2. The charge/discharge circuit includes a bias voltage source which produces such a bias voltage that the emitter-collector voltage of the p-type transistor QP1 becomes substantially equal to the emitter-collector voltage of the p-type transistor QP2. As a result, it is possible to limit an error of a charge current charged into the capacitor, which is caused by the emitter-collector voltage dependent change of the collector current and thus the base current, known as the Early effect.
    • 充电/放电电路基于载波检测器电路中的接收信号创建载波检测电平,用于在诸如用于IR遥控器的接收机的应用中检测载波的存在或不存在。 充电/放电电路用于在p型晶体管QP1中放大在n型晶体管QN1,QN2,QN3和参考电流源中产生的电流。 放大的电流由电流镜电路镜像,以作为p型晶体管QP2的发射极电流提供。 充电/放电电路以小电流(即p型晶体管QP2的基极电流)对电容器充电。 充电/放电电路包括偏置电压源,其产生这样的偏置电压,使得p型晶体管QP1的发射极 - 集电极电压变得基本上等于p型晶体管QP2的发射极 - 集电极电压。 结果,可以限制由集电极电流的发射极 - 集电极电压依赖的变化引起的充电到电容器中的充电电流的误差,从而限制被称为早期效应的基极电流。
    • 8. 发明授权
    • Receiving circuit and electronic apparatus for optical communication
    • 光通信接收电路和电子设备
    • US07460792B2
    • 2008-12-02
    • US11175340
    • 2005-07-07
    • Naruichi YokogawaTakeshi Nishino
    • Naruichi YokogawaTakeshi Nishino
    • H04B10/06
    • H04B10/114
    • In an optical communication-use receiving circuit of the present invention, the pulse width of the received pulse which is a binary signal corresponding to the signal optical pulse is specified by using an integration circuit and a trigger generating circuit. If the pulse width of the received pulse is not shorter than a predetermined value, a signal having a fixed pulse width is outputted as an output signal from a one-shot pulse generating circuit, so that a pulse having a constant pulse width corresponding to the specified communication speed is outputted. Accordingly, if the pulse width deriving from the signal optical pulse is larger than a certain value, the communication is deemed as a low-speed communication, and a pulse having a constant pulse width corresponding to the communication speed is outputted. As a result, it is possible to realize a small-size receiving circuit and a small-size electronic device which require no external switching-over terminal.
    • 在本发明的光通信用接收电路中,通过使用积分电路和触发发生电路来规定作为与信号光脉冲对应的二进制信号的接收脉冲的脉冲宽度。 如果接收脉冲的脉冲宽度不小于预定值,则从单触发脉冲发生电路输出具有固定脉冲宽度的信号作为输出信号,使得脉冲宽度对应于 输出指定的通信速度。 因此,如果从信号光脉冲导出的脉冲宽度大于一定值,则通信被认为是低速通信,并且输出具有与通信速度对应的恒定脉冲宽度的脉冲。 结果,可以实现不需要外部切换端子的小尺寸接收电路和小型电子设备。
    • 9. 发明授权
    • Comparator circuit and infrared signal receiving apparatus
    • 比较电路和红外信号接收装置
    • US06693466B2
    • 2004-02-17
    • US10293563
    • 2002-11-14
    • Takahiro InoueNaruichi YokogawaTakeshi Nishino
    • Takahiro InoueNaruichi YokogawaTakeshi Nishino
    • H03K5153
    • H03K5/2418H03K3/02337H03K3/2897
    • The present invention has an object to control easily the pulse width of an output by operating a limiting circuit appropriately even if the power voltage is low. A limiting circuit is provided on the input side of a hysteresis comparator circuit to prevent saturation. A limit voltage Vlimit is set by a bias circuit so as to change in accordance with the operation of the hysteresis comparator circuit. When an input voltage Vsig exceeds a hysteresis threshold voltage Vth, the limit voltage Vlimit is dropped in response to a drop of the hysteresis threshold voltage Vth. Thus, the width of the pulse width can be controlled while maintaining the condition that the limit voltage Vlimit is higher than the hysteresis threshold voltage Vth.
    • 本发明的目的是即使电源电压低,也可以适当地操作限制电路来容易地控制输出的脉冲宽度。 在滞环比较器电路的输入侧提供限制电路以防止饱和。 极限电压Vlimit由偏置电路设置,以便根据滞后比较器电路的操作而改变。 当输入电压Vsig超过滞后阈值电压Vth时,极限电压Vlimit响应于滞后阈值电压Vth的下降而下降。 因此,可以控制脉冲宽度的宽度,同时保持极限电压Vlimit高于滞后阈值电压Vth的条件。