Switched-mode power supply tutorials

A switching-mode power supply (SMPS) is an electronic power supply that incorporates a switching regulator to convert electrical power efficiently. Switching regulators are used as replacements for linear regulators when higher efficiency, smaller size or lighter weight are required. The main advantage of the switching power supply is greater efficiency than linear regulators. The downside of them are that their circuits are more complicated than linear power supplies and their switching currents can cause electrical noise problems if not carefully suppressed. If the SMPS has an AC input, then the first stage is to convert the input to DC.

Here are some tutorial videos on switched-mode power supply technology:

How Does a Switching Power Supply Work 1 (schematic, explanation, example, modifications)

How Does a Switching Power Supply Work 2 (measurements)

How Does a Switching Power Supply Work 3 (CCM vs. DCM)

Simple 12V 1A LED Power Supply – with schematic and transformer autopsy

12V 5A LED switching power supply – with schematic

12V 5A Switching Transformer Autopsy – How it’s constructed? Is it safe?

Howto repair switch mode power supplies #1: basics, and block diagram of a PSU

Howto repair switch mode power supplies #2: Stand-by circuit and its functionality

2 Comments

  1. buon hang thung xin says:

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  2. Tomi Engdahl says:

    Mains powered SMPSU repair tips from
    https://www.facebook.com/groups/electronichobycircuits/permalink/3240520219305998/

    Very easy to check it if you have the tools. A variable PSU with current limit can be used to power it up, by apply 24V 1A directly connect it to the 400V caps lead. Make sure polarity is right or you will further damage more components on the board. Bypass the Vcc pin of pwm contoller ic with a 100 ohm resistor to the positive supply of 24 V. Check the output gate driver. Also check the MOSFET. That’s one of the culprit in failed smps. PTC and the rectifier diodes at the primary side also need to be checked. Any bulging caps need to be replaced with the same specs. Don’t forget check the fuse.

    Reply

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