초록 ▼

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 suppli

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.

대표청구항 ▼

A pump control system comprising: a synchronous phase detector for generating a first output signal related to a phase shift between an AC current signal supplied to a pump and a voltage signal supplied to the pump, the first output signal comprising a full cycle of the voltage signal as modified by

A pump control system comprising: a synchronous phase detector for generating a first output signal related to a phase shift between an AC current signal supplied to a pump and a voltage signal supplied to the pump, the first output signal comprising a full cycle of the voltage signal as modified by the polarity of the amplitude of the AC current signal, the synchronous phase detector comprising a first operational amplifier for generating the first output signal; and a switch means for receiving polarity information about the AC current signal and for adjusting the gain of the first operational amplifier in response to the polarity information; a filter means for generating a filtered signal derived from the first output signal; a comparator means for generating a second output signal based on a comparison of the filtered signal to a reference value; a logic means for receiving the second output signal and generating a control signal; and a relay means for turning power to the pump on or off in response to the control signal.