BREAST PUMP SYSTEM

摘要

A breast pump system comprising a solenoid valve is disclosed. The breast pump system further comprises a power source which is arranged to supply electrical power to the solenoid valve so as enable the solenoid valve to move between first and second positions. The breast pump system also comprises a controller configured to detect a change in inductance of the solenoid valve which is indicative of the solenoid valve moving from first to second position and a control action in which the vacuum pump is stopped.

主权项

1. A breast pump system comprising:
a solenoid valve; a power source arranged to supply electrical power to the solenoid valve so as enable the solenoid valve to move between a first and a second position; a controller configured to detect a change in inductance of the solenoid valve which is indicative of the solenoid valve moving from the first to the second position; and a resistor that is connected in series with the solenoid valve and the power source,wherein the controller is arranged to detect a voltage across the resistor, when the resistor is connected to a reference voltage or to ground, or to detect a voltage at a node between the solenoid valve and the resistor, when the resistor is connected to ground.