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Why does power supply voltage drop?
If a power supply is spatially separated from the load to be supplied, a voltage drop will exist between the regulated voltage and the location where the electrical energy is needed. This voltage drop depends on the resistance present between the voltage regulator and the load.
How does a switched mode power supply work?
A switch mode supply works by turning the mains electricity on and off very quickly to reduce the voltage. In this case the reduction in voltage depends upon the ratio of the on time and off time. Switching takes place very fast, at 10,000 times a second or quicker.
How many volts does a gaming PC use?
Computer Power Supply Voltages 12 Volts is required to feed the mainboard and any new-gen graphics cards. 5 Volts is necessary for the chassis and CPU fan or USB ports. 3.3 Volts is used to power the CPU.
What is switched-mode power?
Switched-mode converters are DC/DC converters, dedicated to the supply of DC loads with a regulated output voltage and protections against overcurrents and short circuits. Then, a non-controlled rectifier (diode rectifier) realises the conversion from AC to DC.
What is a normal CPU voltage?
The core-voltage requirement ranges from 0.9 to 1.3 V and is usually defined by specific processor performance criteria. The latest core-supply voltage tolerance require- ments are typically ±3%.
How many rails are there in a PSU?
Already stated above that a PSU includes three basic rails which are +3.3V, +5V and +12V. And here is the list of components that are powered by the rails. Power supply units are available with both single Rails and multiple rails.
What’s the voltage drop on a 12V rails?
The drop on the 12v rails is only 2.2% on the 5v 4% but on the 3.3v that’s 15% which seems a bit much to me. Gold certified is efficiency and doesn’t say much for this kind of thing. It’s just total power in divided by power out and averages can always hide a lot.
Is it OK to drop voltage on a PSU?
Since most power is through the 12 volt rails quite a bit of ineficiency can be hidden on the lower rails! Looking at the spec sheet it is well within the undervolt protection range so probably OK. Let us know what they say!
How is a single rail PSU Power Supply monitored?
In case of single rail, the +12V power supply is monitored through one single circuit and there is just one OCP chip configured. The chip gets off as soon as the max amp is reached. But in case of multi-rail PSU, the +12V power source is monitored by multiple OCP chip configured on the PSU.