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    • 7. 发明授权
    • Constant voltage power supply circuit
    • 恒压电源电路
    • US07859235B2
    • 2010-12-28
    • US12255174
    • 2008-10-21
    • Takahiro Yamashita
    • Takahiro Yamashita
    • G05F1/575G05F1/595
    • G05F1/56
    • A first output transistor forms a first current path between an input and an output terminal and has a first control terminal applied with a first control signal. A second output transistor forms a second current path between the output and a ground terminal and has a second control terminal applied with a second control signal. A first comparator outputs the first control signal to decrease an ON-resistance of the first transistor when an output voltage from the output terminal is a predetermined value or less. A second comparator outputs the second control signal to render the second transistor conductive to decrease the output voltage when the output voltage is a predetermined value or more. An acceleration circuit accelerates charging of the first control terminal of the first transistor to a predetermined potential. The inhibition circuit inhibits the acceleration circuit operation according to a change of the second control signal.
    • 第一输出晶体管在输入端和输出端之间形成第一电流路径,并具有施加第一控制信号的第一控制端。 第二输出晶体管在输出和接地端之间形成第二电流路径,并具有施加第二控制信号的第二控制端。 当来自输出端子的输出电压为预定值或更小时,第一比较器输出第一控制信号以减小第一晶体管的导通电阻。 当输出电压为预定值或更大时,第二比较器输出第二控制信号以使第二晶体管导通,以降低输出电压。 加速电路将第一晶体管的第一控制端子的充电加速到预定电位。 禁止电路根据第二控制信号的变化来禁止加速电路的动作。