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== Question 6 == | == Question 6 == | ||
− | + | === recommendation for mains powered voltage regulator to power a CPU? === | |
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Date: 2010-01-10 | Date: 2010-01-10 | ||
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There are detailed schematics and parts lists at: | There are detailed schematics and parts lists at: | ||
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* [http://www.national.com/an/AN/AN-1061.pdf#page=1 National Semiconductor "Application Note 1061 Power Conversion in Line-Powered Equipment"] | * [http://www.national.com/an/AN/AN-1061.pdf#page=1 National Semiconductor "Application Note 1061 Power Conversion in Line-Powered Equipment"] | ||
* [http://focus.ti.com/general/docs/litabsmultiplefilelist.tsp?literatureNumber=slva001d Texas Instruments: "Designing Switching Voltage Regulators With the TL494"] | * [http://focus.ti.com/general/docs/litabsmultiplefilelist.tsp?literatureNumber=slva001d Texas Instruments: "Designing Switching Voltage Regulators With the TL494"] | ||
* ... FIXME: add more examples here ... | * ... FIXME: add more examples here ... | ||
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* ... | * ... | ||
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Practical answer 3: | Practical answer 3: | ||
Buy one off the shelf. | Buy one off the shelf. | ||
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[http://www.mini-box.com/AC-DC-power-supplies mini-box], and | [http://www.mini-box.com/AC-DC-power-supplies mini-box], and | ||
[http://newark.com/ Newark], | [http://newark.com/ Newark], | ||
and several other [[supplier]]s all sells plug-in adapters that produce 5 VDC for under $10. | and several other [[supplier]]s all sells plug-in adapters that produce 5 VDC for under $10. | ||
--[[User:DavidCary|DavidCary]] 06:12, 5 February 2010 (UTC) | --[[User:DavidCary|DavidCary]] 06:12, 5 February 2010 (UTC) | ||
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Theoretical answer 1: | Theoretical answer 1: | ||
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[http://www.national.com/analog/power/webench National Semiconductor WEBENCH Power Designer] | [http://www.national.com/analog/power/webench National Semiconductor WEBENCH Power Designer] | ||
refuses to design a switching power supply with an input voltage higher than 100 VDC. | refuses to design a switching power supply with an input voltage higher than 100 VDC. | ||
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Rohm, Texas Instruments, etc. also have a similar mystifying limitation. | Rohm, Texas Instruments, etc. also have a similar mystifying limitation. | ||
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Is it because of "extra-low voltage" liability laws and regulations? | Is it because of "extra-low voltage" liability laws and regulations? | ||
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Is it because the UL approval people (CE, etc.) are familiar with transformers, and because they are unfamiliar with anything else, it's too much hassle to get them to approve "new" power supplies no matter how much safer and more efficient and less noisy they are than the traditional power supplies? | Is it because the UL approval people (CE, etc.) are familiar with transformers, and because they are unfamiliar with anything else, it's too much hassle to get them to approve "new" power supplies no matter how much safer and more efficient and less noisy they are than the traditional power supplies? | ||
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Does the [http://www.romanblack.com/smps/a04.htm "The 3-transistor Black regulator"] do what you want, if you follow the design notes for adapting it to [http://www.romanblack.com/smps/smps.htm#apps high voltage use]? | Does the [http://www.romanblack.com/smps/a04.htm "The 3-transistor Black regulator"] do what you want, if you follow the design notes for adapting it to [http://www.romanblack.com/smps/smps.htm#apps high voltage use]? | ||
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== Question 5 == | == Question 5 == | ||
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[[russ_hensel]], --[[User:DavidCary|DavidCary]] 12:51, 20 March 2009 (UTC) | [[russ_hensel]], --[[User:DavidCary|DavidCary]] 12:51, 20 March 2009 (UTC) | ||
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