Abstract: An impedance-steerable circuit for an industrial phase controller inserts precise steerable trigger pulses in the sine and cosine excursions of a sine wave of high-energy capacitive and related discharge systems. Multiple pulses and Barkhausen effects are eliminated. The controller can lock capacitive discharge systems into precise phase or, in extended embodiments, serve as a power controller for radar systems, laser systems, and beam weapons. Thyristors and thyratrons provide steered elements (pulses) activated in a pulse-feedback mode.

Abstract: An apparatus and method utilizing a sweep-frequency, high voltage generator coupled to an applicator gun for feeding electric power into pest-infested dielectrics, for example termite-infested wood. Utilizing a conventional line frequency of 120 or 60 Hz, the generator produces 140 kilovolts propagated within a spectral band ranging from 15 to 120 kHz and rich in harmonics. Output is discharged through a high-voltage energy storage capacitor charged using an insulated gate bipolar transistor driven by a variable frequency inductively coupled multivibrator. The output voltages penetrate dielectrics and electrocute the pests inside. The invention is effective against insects having hard exoskeletons comprised substantially of cuticulin, chitin, and sclerotin.

Abstract: A ground fault interrupter circuit is disclosed, comprising a high-voltage input from a public utility transformer, polarity reversal means coupled to the high-voltage input with polarity-switchable output coupled through a thyristor to a relay means. Radio frequency (RF) detection means are coupled to the thyristor gate, causing the thyristor to energize the relay and interrupt load power when radio frequency interference is detected from the load. The RF detector means comprises a plurality of RF chokes and resistor-capacitor pairs feeding a rectifier diode coupled to the thyristor gate. When RF is detected, the diode feeds negative direct current to the thyristor gate, interrupting conduction of the thyristor and the LOAD.

Abstract: A ground-safety controller circuit containing a thyristor that senses grounding of electrical equipment and enables interruption of power to the equipment.

Abstract: An apparatus and method utilizing a phase-locked high voltage, high-frequency pulse generator capable of quasi-unlimited power output and an applicator gun for feeding electric power into pest-infested dielectrics, for example termite infested wood. Utilizing a conventional line frequency of 50 or 60 Hz, the generator produces high energy pulses. The pulses are fed into an applicator gun for application at high voltages. The voltages penetrate dielectrics and electrocute the pests inside.

Abstract: An apparatus and method for controlling pests, particularly termites. The method involves the application of broad band radio frequency or multifrequency high-voltage electrical energy to termite shelter tubes, galleries and nests and to the bodies of the termites themselves. Killing of termites is accomplished directly by electroshock and indirectly by interference with the digestive processes of the termites. The apparatus is a probe gun incorporating circuitry for generating an electric signal having a voltage in the 100,000 volt range and a frequency range of 0-500 KHz.