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Deepak Sangwan
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Join Date: Feb 2012
Posts: 2

DC Power Supply

02/22/2012 4:50 AM

What is the main difference between regulated power supply and switch mode power supply ?

I have some problem with passive infra red sensor (input 12v DC). some one told me that i should use switch mode power supply instead of regulated power supply.
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Crabtree
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#1

Re: DC power supply

02/22/2012 5:34 AM

It's unlikely to be the power supply, Captain, unless everything else that hangs on that supply is affected too.

As to the differences between types of power supplies, well, let's just say that internet search engines are wonderful things, eh?

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mjb1962853
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Engineering Fields - Electrical Engineering - Analog and Digital Circuit Design Engineering Fields - Electromechanical Engineering - Transformers, Motors & Drives, EM Launchers Engineering Fields - Engineering Physics - Applied Electrical, Optical, and Mechanical

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#2

Re: DC Power Supply

02/22/2012 10:51 AM

A properly designed PIR sensor should not care if the regulated power supply is a switch-mode or linear design. HOWEVER, excess heat can cause problems with infrared sensors. Switch-mode power supplies are usually more efficient (dissipate less heat) than equivalent linear supplies.
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JRaef
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#3

Re: DC Power Supply

02/22/2012 11:27 AM

It's not regulated vs switch mode, a switch mode power supply is usually regulated. It's switch mode vs linear or regulated vs non-regulated. If you have a non-regulated linear power supply, that can effect the output of a sensor because it will fluctuate with incoming line fluctuations. A regulated power supply provides a steady state output regardless of input fluctuations within it's stated tolerance.

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