Abstract: A pump control system for controlling a fluid pump powered by an AC signal. The pump control system includes a signal phase detector coupled to the fluid pump to detect the AC signal supplied to the fluid pump and to generate phase signals indicating a phase parameter of the AC signal. The pump control system also includes a micro-controller to receive the phase signals and to generate a rectified output signal based on the phase signals, and a relay to control the power supplied to the fluid pump based on the output signal of the micro-controller.

Abstract: A pump control and protection system comprised of an analog module and a digital module. The analog module includes a synchronous phase detector, a pressure transducer and an over voltage/under voltage circuit. The synchronous phase detector determines the phase angle between a current signal supplied to a water pump and a voltage signal supplied to the pump. The output of the phase detector is directed to a programmable array logic device in the digital module and used to activate a solid state relay that controls the power supplied to the pump. The water pressure in the system is displayed on a digital display.