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kundansona
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Join Date: Mar 2009
Location: Toronto - Canada, Originally from Mumbai _ India
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Power Consumption of CV Switched-Mode Power Adapter

04/16/2009 9:11 AM

Hi!!! I am Mechanical Engineer and so have a querry.

A Constant Voltage Switched mode type power adaptor with specs. Input: 110 volts AC at 0.1 A and Output: 12 V DC with 5A max. (60 VA) . Can some one let me know weather the power consumption on primary AC circuit will vary according to load connected on secondary circuit????. Say we vary draw of 5 watts to 20 watts to 40 watts at 12V DC. Appreciate and thank you all in advance

Kundansona
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user-deleted-1105
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Re: Power Consumption of CV Switched-Mode Power Adapter

04/16/2009 9:20 AM

Basically the power in the input will be the same as the power drawn from the output, plus a bit of quiescent* power and a few percent extra for the inefficiency.

*Quiescent current is by deffinition the 'no load' current and is tuff like the magetising current of a transformer.

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kundansona
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#2
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Re: Power Consumption of CV Switched-Mode Power Adapter

04/16/2009 9:35 AM

Thanks.... It means the Input Power consumption will vary and depend on the variable connected output of the adaptor.
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user-deleted-1105
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Re: Power Consumption of CV Switched-Mode Power Adapter

04/16/2009 9:49 AM

Yes...

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Andy Germany
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#4
In reply to #1

Re: Power Consumption of CV Switched-Mode Power Adapter

04/20/2009 8:44 AM

GA from me.

Also, there are some good chips around to do just that without too much hassle. I used one for a CNC power supply last year.....worked first time too......a conventional power supply would use too much energy in idle.....the SMPS varies woth load.

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