High-power modulator

  • US 5,444,610 A
  • Filed: 10/22/1993
  • Issued: 08/22/1995
  • Est. Priority Date: 10/22/1993
  • Status: Expired due to Term
First Claim
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1. A high-power modulator, comprising:

  • a plurality of means for limiting voltage; and

    a plurality of controllable switches, each of the switches connected in parallel with a different one of the voltage limiting means to form a plurality of parallel pairs, each of the parallel pairs connected to each other in a series combination with a first parallel pair in the series combination being connectable to a main power source and a last parallel pair in the series combination being connectable to a load;

    each of the switches being switchable from an off or open position to an on or closed position such that, for each of the parallel pairs;

    with the switch in the off position,when voltage applied to the voltage limiting means is above a first predetermined voltage, current is allowed to conduct through the voltage limiting means and a voltage potential drop across the voltage limiting means is substantially independent of the current conducted therethrough, andwhen voltage applied to the voltage limiting means is below the first predetermined voltage, current is substantially prevented from passing through the voltage limiting means; and

    with the switch in the on position, current is substantially all conducted through the switch and the voltage potential drop across the voltage limiting means is substantially zero;

    the series combination having a voltage potential drop thereacross which is varied by operation of the controllable switches wherein;

    a ratio of switches in the on position to those in the off position determines the voltage potential drop across the series combination and thus the voltage applied to the load by the main power source,with each of the switches in the on position, the voltage potential drop across the series combination is substantially zero and substantially all of the voltage of the main Dower source is applied to the load, andwith each of the switches in the off position, the voltage potential drop across the series combination is greater than the voltage applied by the main power source and substantially no current is conducted to the load.

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