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    • 3. 发明授权
    • Reference voltage circuit
    • 参考电压电路
    • US4725770A
    • 1988-02-16
    • US13549
    • 1987-02-11
    • Mitsuhiko OkutsuTatsuo ShimuraTadaaki KariyaKazuyoshi Masuda
    • Mitsuhiko OkutsuTatsuo ShimuraTadaaki KariyaKazuyoshi Masuda
    • G05F3/30G05F3/20
    • G05F3/30
    • A reference voltage circuit in which an output reference voltage is stabilized against variations in power source as well as in transistor current amplification factor h.sub.FE. In a reference voltage circuit comprising a DC power source connected to an output terminal, first and second resistors with their respective one ends commonly connected to the output terminal, a first NPN transistor with its collector shorted with its base and connected to the other end of the first resistor and its emitter grounded, a second NPN transistor with its collector connected to the other end of the second resistor and its base connected to the collector of the first NPN transistor, a third resistor connected between the emitter of the second NPN transistor and the ground, and a third NPN transistor with its collector connected to the output terminal, its base connected to the collector of the second NPN transistor and its emitter grounded, there are further provided a fourth resistor connected between the collector of the third NPN transistor and the output terminal and a PNP transistor with its base connected to the collector of the third NPN transistor, its emitter connected to the output terminal and its collector grounded.
    • 参考电压电路,其中输出参考电压针对电源的变化以及在晶体管电流放大系数hFE中稳定。 在包括连接到输出端子的直流电源的参考电压电路中,第一和第二电阻器的相应的一端共同连接到输出端子,第一NPN晶体管的集电极与其基极短接并连接到另一端 第一电阻器及其发射极接地,第二NPN晶体管的集电极连接到第二电阻器的另一端,其基极连接到第一NPN晶体管的集电极,第三电阻器连接在第二NPN晶体管的发射极和 接地和第三NPN晶体管,其集电极连接到输出端,其基极连接到第二NPN晶体管的集电极并且其发射极接地,还提供连接在第三NPN晶体管的集电极和第三NPN晶体管的集电极之间的第四电阻器, 输出端子和PNP晶体管,其基极连接到第三NPN晶体管的集电极,其发射极连接 输出端子及其集电极接地。
    • 4. 发明授权
    • Semiconductor switching circuit
    • 半导体开关电路
    • US4833587A
    • 1989-05-23
    • US171383
    • 1988-03-21
    • Shigeru SugayamaTadaaki KariyaTatsuo ShimuraSigeo Tomita
    • Shigeru SugayamaTadaaki KariyaTatsuo ShimuraSigeo Tomita
    • H01L27/06H03K17/72H03K17/732
    • H01L27/0641H03K17/72H03K17/732H01L2924/0002
    • A fraction of current passing through the P-emitter region and N-base region of a thyristor is by-passed to the base-emitter junction of a PNP transistor. The amount of the base current is dependent on the thyristor current. Thus, as the anode current of the thyristor increases, the base current and hence the collector current of the PNP transistor increases. The collector current by-passed to the PNP transistor is fed, via a switch which is closed during the off-time of the thyistor, to the base-collector path of an NPN transistor whose collector and emitter are respectively connected to the gate and cathode of the thyristor. The turn-on voltage across the collector and emitter of the NPN transistor accordingly becomes lower than the gate-cathode voltage of the thyristor. The base-emitter current of the NPN transistor equals the collector current of the PNP transistor, the collector current being a fraction of the anode current by-passed to the PNP transistor. A fraction of the anode current of the turned-on thyristor is utilized as the control power for driving the NPN transistor so that additional external power for turning off the thyristor becomes almost unnecessary.
    • 通过晶闸管的P发射极区域和N基极区域的电流的一部分被旁路到PNP晶体管的基极 - 发射极结。 基极电流的量取决于晶闸管电流。 因此,随着晶闸管的阳极电流增加,PNP晶体管的基极电流和集电极电流增加。 旁路到PNP晶体管的集电极电流通过在晶体管截止时间期间闭合的开关馈送到集电极和发射极分别连接到栅极和阴极的NPN晶体管的集电极路径 的晶闸管。 因此,NPN晶体管的集电极和发射极两端的导通电压变得低于晶闸管的栅极 - 阴极电压。 NPN晶体管的基极 - 发射极电流等于PNP晶体管的集电极电流,集电极电流是旁路到PNP晶体管的阳极电流的一部分。 导通晶闸管的阳极电流的一部分被用作用于驱动NPN晶体管的控制功率,使得几乎不需要用于关断晶闸管的附加外部电源。