Power amplifier
    5.
    发明授权
    Power amplifier 失效
    功率放大器

    公开(公告)号:US06172568B2

    公开(公告)日:2001-01-09

    申请号:US09208419

    申请日:1998-12-10

    申请人: Shigeru Kitagawa

    发明人: Shigeru Kitagawa

    IPC分类号: H03F304

    CPC分类号: H03F1/0233 H03F1/0244

    摘要: In a power amplifier, a voltage amplifier stage amplifies voltage of an input signal on the basis of a feedback voltage from a feedback circuit and provides an output signal. A power amplifier stage amplifies power of the output signal from the voltage amplifier stage and provides an output signal. The output signal from the power amplifier stage is supplied to a load and also to the feedback circuit and a voltage divider. The voltage divider divides the output signal from the power amplifier stage to output a divided voltage. A constant voltage circuit regulates a supplied DC voltage to a constant voltage with a voltage at an internal reference point being swung due to the divided voltage from the voltage divider, and then supplies a regulated DC voltage to the voltage amplifier stage. Since the voltage amplifier stage operates with the regulated DC voltage, it can strengthen a voltage of its own output signal and the withstand voltage of the voltage amplifier stage can be lower than a withstand voltage of the power amplifier stage. This results in a high power amplifier with a low price.

    摘要翻译: 在功率放大器中,电压放大器级基于来自反馈电路的反馈电压放大输入信号的电压,并提供输出信号。 功率放大器级放大来自电压放大器级的输出信号的功率并提供输出信号。 来自功率放大器级的输出信号被提供给负载以及反馈电路和分压器。 分压器分压功率放大器级的输出信号,输出分压。 恒定电压电路将供电的直流电压调节到恒定电压,内部参考点的电压由于分压器的分压而摆动,然后将稳压的直流电压提供给电压放大器级。 由于电压放大器级以调节的直流电压工作,因此可以加强其自身输出信号的电压,并且电压放大器级的耐受电压可以低于功率放大器级的耐受电压。 这导致了具有低价格的高功率放大器。

    Method and apparatus for detecting flaws within a conductive object
while cancelling the effects of variation in distance between the
detection apparatus and the conductive object
    6.
    发明授权
    Method and apparatus for detecting flaws within a conductive object while cancelling the effects of variation in distance between the detection apparatus and the conductive object 失效
    用于检测导电物体内的瑕疵的方法和装置,同时消除检测装置与导电物体之间的距离变化的影响

    公开(公告)号:US5391988A

    公开(公告)日:1995-02-21

    申请号:US39234

    申请日:1993-04-20

    申请人: Shigeru Kitagawa

    发明人: Shigeru Kitagawa

    IPC分类号: G01N27/90

    CPC分类号: G01N27/904 G01N27/9053

    摘要: A method and apparatus for nondestructively detecting a flaw such as a hairline crack or defect within a conductive object to be inspected. Surface flaws can be distinguished from deep flaws. The pulse duration of the pulse voltage induced in the secondary coil of a sensor is measured at two separate time instances. At one time instance, the pulse duration is affected by variations in the distance between the sensor and the object but is not affected by the flaw. At the other time instance the pulse duration is affected by said variations and also by the flaw. The effect of said variations is cancelled, using these two measured pulse durations. Only a signal correctly indicating the flaw is extracted to detect the presence of the flaw.

    摘要翻译: PCT No.PCT / JP91 / 01218 Sec。 371日期:1993年4月20日 102(e)日期1993年4月20日PCT 1991年9月13日PCT PCT。 出版物WO93 / 06477 日期1994年4月1日。一种用于非破坏性地检测待检查的导电物体内的发丝裂纹或缺陷的缺陷的方法和装置。 表面缺陷可以区别于深层缺陷。 传感器的次级线圈中感应的脉冲电压的脉冲持续时间在两个不同的时间实例中被测量。 在某种程度上,脉冲持续时间受到传感器与物体之间距离的变化的影响,但不受缺陷的影响。 另一方面,脉冲持续时间受到所述变化以及缺陷的影响。 使用这两个测量的脉冲持续时间来消除所述变化的影响。 仅提取正确指示缺陷的信号以检测缺陷的存在。