EEVblog Electronics Community Forum
Electronics => Projects, Designs, and Technical Stuff => Topic started by: ali_asadzadeh on June 13, 2017, 10:37:18 am
-
Hi,
My friend send me this puppy for repair, I just wanted to know what's the principle behind it, I can see it has a full-bridge MOSFET that is tied to a mysterious big chunky inductor that's connected to this huge heat sink. which I think can do the welding with the magnetic field.
any Ideas are welcome!
-
The main controller part is SG3526 and the MOSFETs are APT55M50JFLL ,and two IR2113 MOSFET drivers, you can see the big self and caps there, I think they have used the litz wire for them! there is nothing special with this puppy, everything is jelly bean parts.
-
looks like it's an inductive sealing unit. An inductive coil creating a varying magnetic field heats some sort of aluminium layer in the sealing material and melts it to the container.
-
Thanks for the info, would you explain more? how is the SG3526 working? do you have any tutorial or app note about it
-
Yep, its an inductive sealing unit, it heats up the metal foil in the package which melts the plastic when it is squished in the sealing jaws.
The SG3526 is a pretty generic PWM chip, it drives the gates of the mosfets in a H-bridge which turns the DC coming in to AC, basically a high frequency inverter. The rectangular blue caps are part of the tank circuit.
-
Yep, its an inductive sealing unit, it heats up the metal foil in the package which melts the plastic when it is squished in the sealing jaws.
The SG3526 is a pretty generic PWM chip, it drives the gates of the mosfets in a H-bridge which turns the DC coming in to AC, basically a high frequency inverter. The rectangular blue caps are part of the tank circuit.
Thanks Macona, Do you have a simplified circuit diagram? thanks in advance