SG3525 Driving Full Bridge

[twenglish1]

I have been doing lots of reading on the SG3525 PWM IC, i drew up this schematic and am wondering if it will work for driving a full bridge inverter? i understand that i am not using the SG3525 to its full potential in this schematic

 

[MicrosiM]

I have been doing lots of reading on the SG3525 PWM IC, i drew up this schematic and am wondering if it will work for driving a full bridge inverter? i understand that i am not using the SG3525 to its full potential in this schematic

There are many ways of building a full bridge converter with SG3525, or any other chip with same functions.

Your idea will work, without problems, but you have to test it only at first.

Other options is to use 2 Chips of IR2110 and that's it


Regards

 

[twenglish1]

I will also look into the IR2110 option, and understand the importance of testing the driver before connecting it to the IGBTs, once I get this circuit built, I will test and post the waveforms

 

[twenglish1]

I could not find the option to edit, but i also have one more question, when choosing the ferrite torroid for the gate drive transformer what should i look for? i was told to avoid the toroids used in AC line filtering, so where should i look for a torroid? I would prefer to buy over salvage that way i know what i am getting

 

[KX36]

A Guide to Designing Gate-Drive Transformers
For how to design a GDT including core material

Design And Application Guide For High Speed MOSFET Gate Drive Circuits
For everything else you want to know about all kinds of gate drive circuits.

 

[twenglish1]

Do you know a good source of ferrite torroids that any hobbyist can easily purchase? I got my EE80 cores off eBay

 

[KX36]

Digikey, mouser, RS, Farnell etc. That's where I get E cores too. e.g. EF25 core and accessories I'm shopping for now are £12 on eBay but £2.50 on Farnell.

 

[twenglish1]

I will do some experimenting with some cores I have salvaged, if I cannot get the correct waveforms then I will buy some cores that I know will work, just waiting for some parts to come in then I will build and start testing my sg3525 driver

 

[twenglish1]

What size toroid would you recommend?

 

[stewin]

merry CHRISTmass to you all

hi all does any one have an effective working protection schema to use with sg3525??

 

[stewin]

merry CHRISTmass to you all

hi all does any one have an effective working protection schema to use with sg3525??

 

[gloriel]

hi Stewin. for sg3525 i make a long pcb trace to provide 0.35mohm as current sense resistor as you can see the yellow mark at picture

 

[gloriel]

yes i i have made some of Clas H psu using GDT, fullbridge topologi. Transformer core are EE65 for -120 -60 CT 60 120 and EE 70 for -150-75 CT 75 150. unregulated