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    • 2. 发明授权
    • Subscriber loop current regulator
    • 用户回路电流调节器
    • US4476351A
    • 1984-10-09
    • US361690
    • 1982-03-25
    • Mark J. BeegleMark W. Grimes
    • Mark J. BeegleMark W. Grimes
    • H04M19/00
    • H04M19/001
    • A current regulator for supplying dc power to a telephone line employs a resistor feed circuit in conjunction with a solid state feed circuit. The dc line current flowing through both such elements is monitored by a sensing circuit which drives the solid state element in a manner to maintain a desired magnitude of dc line current. The resistor value may be arbitrarily chosen so that the circuit power is shared in a desired proportion between the resistor and solid state element. When used in a telephone line in series with ac voice signals the regulator employs a capacitator and diode bridge arrangement to reduce the ac impedance thereof, improve longitudinal balance and allow bi-directional current.
    • 用于向电话线提供直流电的电流调节器采用与固态馈电电路相结合的电阻馈电电路。 流过这两个元件的直流线电流由感测电路监测,该感测电路以维持期望的直流线电流幅度的方式驱动固态元件。 可以任意选择电阻值,使得电路功率以电阻和固态元件之间的所需比例共享。 当用于与交流语音信号串联的电话线路时,调节器采用电容器和二极管桥接装置来减小其交流阻抗,改善纵向平衡并允许双向电流。
    • 3. 发明授权
    • Sine wave ring generator
    • 正弦波发生器
    • US4611097A
    • 1986-09-09
    • US620359
    • 1984-06-13
    • Mark W. Grimes
    • Mark W. Grimes
    • H04M19/02H04M5/00H03K5/156
    • H04M19/023
    • This invention depicts a novel sine wave ring generator for use with a telephone circuit and an input voltage having a predetermined range, the generator comprising a switching power supply for providing a pre-determined DC output voltage from the input voltage range, an oscillator for providing a pseudo-sine wave output with a predetermined frequency, and an amplifier for amplifying the pseudo-sine wave and for receiving the predetermined DC voltage having a low output impedance thereby maintaining regulation of a circuit output voltage in a predetermined range and supplying a circuit output current.
    • 本发明描述了一种用于电话电路和具有预定范围的输入电压的新型正弦波环发生器,该发生器包括用于从输入电压范围提供预定DC输出电压的开关电源,用于提供 具有预定频率的伪正弦波输出,以及用于放大伪正弦波并用于接收具有低输出阻抗的预定DC电压的放大器,从而保持电路输出电压在预定范围内的调节并提供电路输出 当前。