Electromagnetic pump loading state detecting method for e.g. automatic coffee maker, involves detecting loading state when difference between maximum pump current time and reference time approaches value related to pumps vacuum state

摘要

The method involves measuring a value of pump current (Ip), at each period of electric supply to an electromagnetic pump. A time (tOB) at which the pump current attains its maximum value, is detected. A time difference (delta T) between the time (tOB) and a reference time (tref) is measured. A loading state of the pump is detected when the time difference approaches a reference value corresponding to a vacuum state of the pump. Independent claims are also included for the following: (a) a device for detecting a state of loading of an electromagnetic pump with a vibrating core supplied by a half-wave rectified voltage (b) an electrical household appliance having an electromagnetic pump with a vibrating core supplied by a reservoir.