#93 Inverter IGBT Welder Machine (Part -4) Low Voltage SMPS Circuit Explained & Troubleshooting

(To watch these videos in English Language go to ‪@HaseebElectronics‬    • {289} Inverter IGBT Welder Machine, Low Vo...  )
To watch Part 1    • #90 Inverter IGBT Welder Machine (Part -1)...  
Part 2    • #91 Inverter IGBT Welder Machine (Part -2)...  
Part 3    • #92 Inverter IGBT Welder Machine (Part -3)...  
in this video i discussed the circuit diagram of SD6834 / SD6832 Current mode SMPS PWM controller circuit. this ic is used to provide offline switching to produce 25VDC which are regulated in further +5VDC using KA7805 LM7805 and 15 VDC using KA7815 LM7815 UA7815 to provide biasing voltage for display circuit, SG3525 inverter circuit to drive the gates of IGBT transistors. video is narrated in urdu / hindi language and how to repair and troubleshoot inverter IGBT based welding machine. it is titled Inverter IGBT Welder Machine (Part -4) Low Voltage SMPS Circuit Explained & Troubleshooting because this power supply is to convert +330vdc to low voltage 25VDC.
in last videos i discussed the Inverter IGBT Welder Machine (Part -3) IGBT & Gate Driver Circuit Explained & Troubleshooting sg3525 oscillator circuit provides a drive signal to the signal transformer which have two secondary windings (180 degree out of phase to each other) in each secondary there is a gate pulse forming network for igbt. igbt switches and provides power drive to the high frequency transformer takes input drive from IGBT transistors and the center tapped secondary is connected the molded D92-20 rectifier set connected in parallel. there is a shunt which is used as a current sense. the SG3525 IC provides a drive signal to the IGBT gates through gate driver network.
this china MMA-200T Inverter IGBT Welder Machine - Circuit Explained & Troubleshooting Part -1, is single phase 220 VAC operated. it have a bridge rectifier which rectifies the main ac voltage into dc voltage, which are connected to pair of dc capacitors through a relay contacts and in parallel 110 ohms ntc resistor. this nts protects from inrush current and upon receiving relay drive signal it switches the rectified voltage to capacitors so, the ntc is bypassed to get full current to drive igbt.
after watching this video you will learn:-
how to #repair #inverter #igbt #welding machine or welder
2. functional description of inverter igbt welder machine
3. how to troubleshoot arc welding machine
4. how to understand mma-200 circuit diagram and how it works
5. if welding machine does not work, how you will repair
6. if main circuit breaker trips off when power switch is turned on
7. over current OC LED light turns on


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