24 watts to 11 watt Requirement
- Thread starter uday79
- Start date
I believe that it will be fine. If I'm remembering correctly, you can supply as much power as you want to a system and it will only use what is needed and send the rest to ground. It may fatigue the caps and resistors a little faster, but other than that, you should be fine.
Actually... All electronics work like that. All power supplies work off of caps and resistors to correctly transfer the power. The device will only use what it needs and send the rest to ground, but it will fatigue the caps and resistors. This is why when there is a power surge everything turns off. A power surge is a huge surge in power(as the name suggests) that ends up overloading or frying the caps and resistors which is why the device stops working. Once these items are fried, you need to replace them and if you don't you could damage the internal hardware.
No, they don't work like that. I'm a computer engineer, I work with this stuff for a living.
What you may be thinking of is linear regulation. This is a technique used to keep the rail voltage constant, not the power draw constant. It's depreciated in favour of switched regulation which is more efficient.
The power drawn through a PSU is not a constant. A 650 watt PSU is a marketing term for a PSU that can under nominal conditions, safely deliver up to 650 watts combined on the output rails. If the load only demands 25 watts, and the PSU is capable of safely delivering that power without failure, it will draw the necessary amount of power from the socket to meet the load requirements and conversion costs. The same principles apply to 20 watt power supplies for other consumer electronics. Power supply rails are regulated using a variety of techniques to a fixed rail voltage, such as 12 volts, 5 volts, 3.3 volts, etc... and the cumulative power output of the PSU will be the power across all loads connected between the various rails (typically between a hot rail and ground).
Keeping the rail voltage steady is the tricky part, but switched mode power supplies are very efficient. A SMPS may be capable of delivering anywhere from 10 DC watts on a 12 volt rail at 70% efficiency to 25 DC watts on a 12 volt rail at 80% efficiency. The draw from the socket will be between 14.5 VA and 31 VA over the same range, it is not a constant as you suggest. Efficiency drops as the load goes outside of the rated boundaries, and the rail voltage may not be stable outside of this range either.
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