Control circuitry for maintaining forward and reflected transmission line power at a predetermined safe level

Power control circuitry for controlling the power produced by an A.C. generator comprising:

• load voltage circuitry including,
• means for generating a voltage signal representing the A.C. voltage across the load of the generator,
• a first variable voltage source,
• means for selecting a second voltage signal from said first variable voltage source representing the desired output level of said generator,
• a first amplifier means for comparing the first voltage signal and said second voltage signal and producing an output signal representing a power output control signal for controlling the output of said generator;
• and
• reflected voltage circuitry including,
• a second variable voltage source,
• means for selecting a voltage signal from said second variable output voltage source,
• means for generating a voltage representing the power reflected from a load connected to said generator means,
• a second amplifier means for comparing the voltage selected from said second variable source and the voltage representing the power reflected from said load for generating a reflected power output signal,
• switching means coupled to the output of said second circuitry and to the input of said first circuitry for rendering said first circuit inoperative when and for so long as said reflected power output signal exceeds the selected value from voltage signal from said second variable voltage source.