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| 250w led psu supply 18A car air compressor |
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| sdancer75:
I tried to use my car 18A air compressor to my home using a 250W led PSU (20A - 12V). Unfortunately the compressor start for a half of a second, and then it stops. The start up current surge obviously is not enough for this psu. The prime circuit of the psu have a 100uF/400V capacitor. Should it help to raise this capacitor value ? Alternativaly what are my options to make it work ? |
| james_s:
Motors can draw quite enormous startup surges, any reasonably sized capacitor is likely to not be enough. What you could try is adding a RC filter in the current sense feedback loop to slow down the response slightly, however there is some risk that the power supply will be damaged by the momentary surge. You could also try a NTC inrush limiter in series with the compressor. |
| soldar:
You can try starting the compressor with no load and connect the valve once it is running. My guess is there is a good chance it will stall as the PSU cannot keep up. |
| james_s:
Even with no load, the motors used in this sort of thing tend to draw a big enough surge that the fast short circuit protection in many SMPSs will be triggered. It may be possible to slow down the protection just enough to prevent false trips without compromising its ability to protect the PSU. |
| soldar:
Yes, I have a little tire compressor that often will blow the fuse of the lighter/connector in the car so I have learned to connect it directly to the battery terminals. |
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