Power supply for solenoid valve

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Discussion Overview

The discussion centers on the differences between AC and DC power sources for solenoid valves, including power consumption considerations and design implications for mature products. Participants explore the operational characteristics and applications of solenoids in various contexts.

Discussion Character

  • Technical explanation, Debate/contested, Conceptual clarification

Main Points Raised

  • One participant questions the existence of AC solenoids, suggesting that they may induce vibrations at the cyclic frequency of the current, similar to a doorbell buzzer.
  • Another participant asserts that the strongest solenoids typically use DC power, noting that power consumption is primarily due to resistive losses in the coil while holding the slug in place.
  • A different participant claims that AC solenoids are commonly used, citing washing machines as an example.
  • Some participants suggest that the choice between AC and DC power sources depends on the available power supply and cost considerations, indicating that using an existing DC supply may be advantageous.

Areas of Agreement / Disagreement

There is no consensus on the use of AC versus DC solenoids, with participants presenting differing views on their prevalence and operational characteristics. The discussion remains unresolved regarding the specifics of power consumption calculations and the implications of using different power sources.

Contextual Notes

Participants express uncertainty about the calculations related to power consumption during the pull-in phase of solenoids and the potential effects of cyclic frequency on AC solenoids. The discussion does not resolve these technical details.

Aubrey
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what's the difference between AC and DC power source for solenoid valve?and what is mainly the power consumed for?
for mature products available, what should be taken into consideration for power design?
thanks
 
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To tell you the truth, I don't think that I've ever heard of an AC solenoid. They probably work the same way as a DC one, but I can't help suspecting that there would be fatiguing vibrations at or around the cyclic frequency of the current. That is, after all, the basic idea of a doorbell buzzer.
 
I agree with Danger. Certainly the strongest solenoids will use DC power. The power consumed is the resistive losses in the solenoid coil while it holds the slug in tight. I'm not sure how you'd go about calculating the work done and corresponding extra power consumed during the pull-in phase...I just have never gone through that calculation.
 
AC solenoids are used all the time. Your washing machine most likely uses them to turn on and off the water.
 
Which to use is a matter of what power you have available. It is not worth the expense to include a DC power supply just to drive a few solenoids. On the other hand if you already need a DC supply, then use it.
 

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