SHARK REPELLANT DEVICES

摘要

Apparatus for repelling aquatic creatures such as sharks comprising a pair of electrodes (18) for immersion in a body of water, charge storage means such as a capacitor (14) charged to a predetermined voltage by a charging circuit from a source of electrical power, such as a battery, control logic to generate control signals and controllable switch elements (16), such as silicon controlled rectifiers (SCR's), thyristors or the like that have a low on resistance. The thyristors (16) connect the capacitor (14) selectively to the electrodes (18) in response to the control signals, to discharge the capacitor charge into the water, thereby to create an electrical field between the electrodes (18). The charging circuit may be a DC to DC converter (12) that provides an output voltage higher than the battery voltage. The thyristors and associated circuitry are set to discharge the capacitor charge into the body of water in a series of pulses.