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    • 2. 发明授权
    • Transistor drive circuit, constant voltage circuit, and method thereof using a plurality of error amplifying circuits to effectively drive a power transistor
    • 晶体管驱动电路,恒压电路及其使用多个误差放大电路的方法来有效地驱动功率晶体管
    • US07541787B2
    • 2009-06-02
    • US11525058
    • 2006-09-20
    • Katsuhiro HayashiKohji Yoshii
    • Katsuhiro HayashiKohji Yoshii
    • G05F1/575
    • G05F1/56
    • A transistor drive circuit, a constant voltage circuit, and a method thereof provided with a reference voltage generator, a power voltage detector, and a plurality of error amplifying circuits. The plurality of error amplifying circuits have different operational characteristics. One of the error amplifying circuits is selectively activated in response to a control signal in accordance with an operational mode selected. A reference voltage produced by the reference voltage generator or a divided voltage produced by the power voltage detector is also changed in response to the control signal suitably for each one of the plurality of error amplifying circuits which is selectively activated so as to control the power voltage generated by a power transistor to output a constant power voltage.
    • 晶体管驱动电路,恒压电路及其设置有参考电压发生器,电源电压检测器和多个误差放大电路的方法。 多个误差放大电路具有不同的操作特性。 根据所选择的操作模式,响应于控制信号选择性地激活其中一个误差放大电路。 由参考电压发生器产生的参考电压或由电源电压检测器产生的分压也响应于适于选择性地激活的多个误差放大电路中的每一个适当地控制信号而改变,以便控制电源电压 由功率晶体管产生以输出恒定的功率电压。