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Tweakers' Asylum Tweaks for systems, rooms and Do It Yourself (DIY) help. FAQ. |
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Tweakers' Asylum Tweaks for systems, rooms and Do It Yourself (DIY) help. FAQ. |
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In Reply to: I gave a simple example. Not technical...... posted by jea48 on August 30, 2012 at 08:10:20:
RE the light bulb at 96 volts, as rick_m noted, I mis-stated the resistance swing, it should be lower not higher. Of course, the point was, that the light bulb as a load is non-linear.
"But does a drop of 24Vac cause a rise in current to maintain the rated power consumption?"
Not so much a matter of power consumption, but of supplying the devices load with enough power. With switching power supplies, if the incoming voltage goes down, the incoming current has to go up to supply the demand from the load.
"And Does equipment that use switchmode power supplies use voltage regulators? How do they come into play?"
The vast majority of them do, if for no other reason, that the switchmode supply has to self-regulate anyway, and the few added parts that it take's to make that self-regulation slaved to a reference voltage for the output rails to remain stable and regulated are so cheap, that it is common practice.
"As for the Denon amp, I believe, the amp will output less power at 96Vac than 120Vac into a 8 ohm nominal speaker load."
Yes, it probably will, for while many of the better brands of receivers used regulated supplies for the low voltage circuits, such as for the preamp or tuner, they would not have done so for the power amp rails, as that would have required heroic sized components due to the current involved, and the linear/analog nature of the power supply system.
I am not picking nits with you, I just thought it would be informative to others regarding the nature of the loading and current draw. Many people do not realize that switching supplies are likely to draw MORE current, and not less, when the AC line goes low.
Jon Risch
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Follow Ups
- RE: I gave a simple example. Not technical...... - Jon Risch 19:59:15 08/30/12 (2)
- Jon I appreciate your reply. - jea48 21:24:29 08/30/12 (1)
- RE: Jon I appreciate your reply. - Jon Risch 22:26:29 09/01/12 (0)
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