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137 条记录 (耗时 0.013 秒)

    Vectorial signal combiner for generating an amplitude modulated carrier by adding two phase modulated constant envelope carriers
    1.
    发明授权
    Vectorial signal combiner for generating an amplitude modulated carrier by adding two phase modulated constant envelope carriers 失效
    矢量信号组合器，用于通过加入两个相位调制恒定包络载波来产生幅度调制载波

    公开(公告)号：US5345189A

    公开(公告)日：1994-09-06

    申请号：US124123

    申请日：1993-09-20

    申请人： Thomas Hornak ,  William J. McFarland

    发明人： Thomas Hornak ,  William J. McFarland

    IPC分类号： H03H7/48 ,  H03F9/02 ,  H03F9/00 ,  H03D5/00 ,  H03D13/00 ,  H03F3/00

    CPC分类号： H03F1/0294 ,  H03F9/02 ,  H03F2200/541

    摘要： A circuit for combining first and second signals having the same frequency. The signals have a relative phase shift, 2a(t). The circuit generates a signal that is proportional to the sum or difference of signals. The circuit appears to be a resistive load; however, the circuit can be constructed from purely reactive circuit elements, and hence, does not dissipate energy. In one embodiment, the circuit is constructed from a transformer and two LC circuits in which the capacitance is varied in response to a(t). The circuit may be used to construct a high efficiency RF amplification stage.

    摘要翻译： 一种用于组合具有相同频率的第一和第二信号的电路。 信号具有相对相移2a（t）。 电路产生与信号的和或差成比例的信号。 电路似乎是电阻负载; 然而，电路可以由纯反应电路元件构成，因此不会耗散能量。 在一个实施例中，电路由变压器和两个LC电路构成，其中电容响应于（t）而变化。 该电路可用于构建高效RF放大级。

    Control systems for direct current electric motors
    2.
    发明授权
    Control systems for direct current electric motors 失效
    直流电动机的控制系统

    公开(公告)号：US3441827A

    公开(公告)日：1969-04-29

    申请号：US3441827D

    申请日：1966-07-13

    申请人： LANSING BAGNALL LTD

    发明人： PAYNE IVAN SALISBURY

    IPC分类号： B60L11/00 ,  B60L15/08 ,  H02P7/28 ,  H02P7/30 ,  H03F9/02 ,  H02P5/06

    CPC分类号： H03F9/02 ,  B60L11/00 ,  B60L15/08 ,  H02P7/281 ,  H02P7/30 ,  Y02T10/645 ,  Y02T10/646 ,  Y02T10/648 ,  Y10S388/913 ,  Y10S388/917

    摘要： 1,136,253. Magnetic amplifiers. LANSING BAGNALL Ltd. 12 July, 1966 [14 July, 1965], No. 29898/65. Heading H3B, [Also in Divisions G3, H1 and H2] A transductor, for applying a variable proportion of the pulses from a multi-vibrator and shaping circuit to the firing circuit of a thyristor in circuit with an electric motor, comprises cores 12, 13 separated by air gaps 16, 17 wich a reactance winding 18 around the core 12. Around the core 13 there is a single-turn winding 19 carrying the motor current. In the main air gap 14 there is a movable permanent magnet 22 coupled to a control pedal for the motor. Initially the transductor is fully saturated by the control magnet, thus inhibiting pulses to the thyristor, until displacement of the magnet from the position between poles 15 reduces the saturation and increases the pulse repetition rate. The transductor also tends to be saturated by the winding 19, to prevent the supply of "on" pulses until the motor current decreases to a safe value. The winding 18 is connected across the base and emitter of a transistor and is energized by pulses from the shaping circuit, the arrangement being such that the transistor is cut-off to prevent the application of firing pulses to the thyristor when the impedance of the winding 18 is low due to saturation.