Please help me understand theory behind solenoid pumps (also known from Italian brand name ULKA) used in espresso machines for example.
These pumps are AC and rated at 220V, 110V and even 24V. The same time I know rectifier diode is connected series with pump coil so that negative half period is basically cut off. 220VAC sinus peak-to-peak is close to 300V so half of it is 150V. Does it mean I can use 150V DC pulsed (50% on/50% off/50 Hz) to drive 220 VAC solenoid pump? Does it mean even lower DC voltage could be used because squere pulses have longer on time compare to sinusoid? Does it mean I could regulate pressure and flow by changing pulse frequency slightly (lets say 30-60 Hz)?
These pumps are AC and rated at 220V, 110V and even 24V. The same time I know rectifier diode is connected series with pump coil so that negative half period is basically cut off. 220VAC sinus peak-to-peak is close to 300V so half of it is 150V. Does it mean I can use 150V DC pulsed (50% on/50% off/50 Hz) to drive 220 VAC solenoid pump? Does it mean even lower DC voltage could be used because squere pulses have longer on time compare to sinusoid? Does it mean I could regulate pressure and flow by changing pulse frequency slightly (lets say 30-60 Hz)?