Abstract: A load control device is adapted to be disposed in series with an AC voltage source and an electrical load and is operable to provide substantially all voltage provided by the AC voltage source to the load. The load control device comprises a controllably conductive device, a controller, a zero-crossing detector, and a power supply for generating a substantially DC voltage for powering the controller. The power supply is operable to charge an energy storage device to a predetermined amount of energy each half-cycle. The controller is operable to determine when the power supply has stopped charging from the zero-crossing detector each half-cycle, and to immediately render the controllably conductive device conductive to conduct the full load current. Before the controllably conductive device begins to conduct each half-cycle, only a minimal voltage develops across the power supply to allow the energy storage device to charge.

Abstract: An irrigation line gate is adapted to be connected between an upstream irrigation line and a downstream irrigation line of a mobile irrigation system to allow lateral movement of the irrigation line past a stationary obstacle in a direction perpendicular to the length of the line. The irrigation line gate comprises longitudinally-spaced upstream and downstream manifolds connected between upstream and downstream movable irrigation lines. Laterally-spaced retractable gate pipes extending between the manifolds are sequentially opened to clear an obstacle as the irrigation line passes the obstacle. Each gate pipe is supported adjacent one of the manifolds by a longitudinally-spaced pair of pipe support collars. Each pair of support collars receives one of the gate pipes therethrough for slidable movement between open and closed positions.