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    • 32. 发明授权
    • Constant current source device having a ratio metricity between supply
voltage and output current
    • 恒流源装置具有电源电压和输出电流之间的比率
    • US4591780A
    • 1986-05-27
    • US559467
    • 1983-12-08
    • Kazuji YamadaRyoichi KobayashiYasuo NagaiIsao ShimizuKanji Kawakami
    • Kazuji YamadaRyoichi KobayashiYasuo NagaiIsao ShimizuKanji Kawakami
    • H03F3/343G05F3/26G05F3/30H03F3/34H03F3/347G05F3/20
    • G05F3/30G05F3/265
    • A current source device controls a rate of change of current flowing through a load so that the change rate of the current is equal to a change rate of a fluctuating supply voltage. A first transistor is fed with the supply voltage via a first resistor connected to its collector and a second resistor connected to its emitter. A second transistor has a base connected to a base of the first transistor, an emitter connected to a third resistor and a collector connected to a load. A current to the load is fed from the supply voltage via the load, the collector and emitter of the second transistor and the third resistor. The collector and base of the first transistor are respectively connected to a base and an emitter of a third transistor having a collector fed with the supply voltage. The ratio between a voltage drop caused across the second resistor by a reference current flowing through the first resistor, the collector and emitter of the first transistor and the second resistor, and a voltage drop caused across the third resistor by an emitter current of the second transistor, which is substantially equal to a collector current of the second transistor flowing through the load, is set to a predetermined value. The emitter area of the second transistor is enlarged beyond that of the first transistor to obtain a sufficiently large output current.
    • 电流源装置控制流过负载的电流的变化率,使得电流的变化率等于电源电压波动的变化率。 第一晶体管经由连接到其集电极的第一电阻器和连接到其发射极的第二电阻器馈送电源电压。 第二晶体管具有连接到第一晶体管的基极的基极,连接到第三电阻器的发射极和连接到负载的集电极。 通过负载,第二晶体管的集电极和发射极以及第三电阻从供电电压馈送到负载的电流。 第一晶体管的集电极和基极分别连接到具有馈送有电源电压的集电极的第三晶体管的基极和发射极。 通过流过第一电阻器的参考电流,第一晶体管的集电极和发射极以及第二电阻器在第二电阻器之间引起的电压降之间的比率以及由第二电阻器的发射极电流引起的第三电阻器的电压降 基本上等于流过负载的第二晶体管的集电极电流的晶体管被​​设定为预定值。 第二晶体管的发射极面积比第一晶体管的发射极面积增大,以获得足够大的输出电流。