Difference between capacitive power supply and switch mode power supply

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panneerrajan

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Hi,

What is Difference between capacitive power supply and switch mode power supply, Please let me know drawbacks

Thanks
Rajan
 

What is a "capacitive power supply"?
Typically power supply types are separated into "linear" and "switch-mode".
 

Maybe you are referring to a capacitive dropper supply? This is often used in cheap low power LED mains operated lamps.
 

Switch mode supply = one that regulates it's output by switching fully ON then fully OFF cyclically, normally at high speed, so that the average output is controlled.

Capacitive power supply = one that uses the reactance of a capacitor as a voltage dropper. It is simple but does not regulate or isolate the output and has a failure mode that usually results in excessive output. Should only be used where there is a secondary insulation barrier and adequate protection against overload.

Brian.
 

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