Do power supplies have over-current protection?
Most power supplies contain over-current protection, but there are various types. Some have a well-defined current limit close to the maximum output rating. A too-close current limit can force the supply to shut down frequently.
What happens if a power supply reaches a high current?
The result can be extra internal heating that can lead to rapid failure or poor reliability. High current can also introduce a loss of inductance or a saturation of magnetic components such as the PFC (power factor correction) choke.
How does a power supply work?
The power supply has to handle this as well. If the output voltage just drops until it can deliver enough current, then this will work. If the output of the power supply switches off immediately in case of over current, then you will have a supply that constantly turns on and switches off again.
What happens if a power supply is over-current?
Besides causing internal heating from coil resistance, over-currents can cause higher core losses and magnetic saturation, worsening power dissipation and heat rise. Saturation may also stop the power supply from operating or make component failures more likely.
How much power can a Philips Hue outdoor power supply withstand?
The bottom line is that the maximum power is a little more than 70 watts, much more than the 40 watt power supply from Philips Hue should be able to withstand. But with a measuring device I was able to make interesting findings. The outdoor power supply seems to have enough reserves.
How do you choose a power supply?
Power supply selection must also consider environmental conditions. Excessively high or low temperatures can profoundly degrade performance and reliability. Some components, such as electrolytic capacitors, may see a 50% cut in useful life with just a 10°C rise in ambient temperature.
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