Section inside SMPS and Block Diagram

Section inside the SMPS

1-Main filter and rectifier Section

2-Start up Section

3-Switching Section

4-Driver and Control section

5-PG (Power Good) Section

6-Output Section

Block Diagram of SMPS

Main filter and rectifier Section:

Identification:

In this section has Fuse, Distortion capacitor, Surge by pass Capacitor, RF Coil , Bridge Rectifier, and MFC (Main Filter Capacitor)

Function: It receive 230v AC and Convert into DC 300v and Provide to Start –up and Switching Section.

Isolation (Find out this section Working or Not):

If 300 v DC Present on MFC, It means OK. If 300 V DC is not present, it means this section not working. 

Troubleshooting:

Problem 1. 300 v dc is not present at MFC

Solution:  In This Condition check Fuse , RF Coil Thermistor and B/R.

Problem 2. Less Voltage present at MFC.

Solution: In this Condition only Check Bridge Rectifier and MFC.

Problem 3. Fuse again and again faulty.

Solution: Check only RF coil , Decoration Cap. And B/R, MFC. It may Any one component Short .

NOTE:

IF YOU CONNECT BULB (60w) ON PLACE OF FUSE

1-      If Bulb Glow and Off ( Charge and Discharge): Its mean this section Working

2-      If Bulb Not Glow : Check only RF coil  Thermistor and switch if use in CKT.

3-      If Bulb Continue Glow: : Check only RF coil , Decoration Cap. And B/R, MFC. It may Any one component Short.