SMPS and transformer are 2 different power supplies, but the working processes of these circuits are different.
the working of transformer power supply or linear power supply, the first step is to convert the 230 v ac to step down or up using a transformer and then its rectify using any rectifier diode.
but the SMPS is different, it rectifies the 230 volts first and it converts the dc signal to a high-frequency ac signal. after conversion, it will be regulated for the required voltage and current
SMPS vs transformer
|head 1||Transformer power supply||switched-mode power supply (SMPS)|
|cost||cost is higher for comparing smps||switched-mode power supply cost is lower for comparing transformer power supply|
|size||it’s a size bigger compared to SMPS||it is smaller|
|Weight||Weight is high||is weight less than transformer power supply|
|efficiency||efficiency of transformer power supply is 60 %||the efficiency of SMPS is 80 %|
|circuit Complexity||simple circuits and using only a few components||complex circuits and using different types of components|
|Noise||transformer power supply has an only small amount of noise||the noise is very high|
|heat||it has only less heat because it has using a few components, so do not need any heat sink and another cooling system||the SMPS has used different types of semiconductor components, these components need a cooling system ex: heat sink, fan|
|Voltage regulator||some special voltage regulators are used to regulate the voltage||some complicated feedback circuit is used to regulate the voltage|
|Rf protection||It does not need any RF protection shield||RF shield required|
|application||• Low noise amplifiers • laboratory test equipment • battery charger||• used in vehicles • mobile charger • personal computers.|