Jump to content

Toshiba Half Bridge Igbt Questions Spot Welder Homemade Capicitive Discharge Spot Welder


Recommended Posts

hi there i know i may be a bit off topic but i have a toshiba half bridge igbt mg75q2ys50 and im wondering how do i drive it.


i know it has got a voltage gate to emitter of max 20 v and turn on from somewhere from 3 to 6 volts thats cool if i have 600 volts across the bridge do i have to supply 600 volts + somwhere between 3-6 to turn on the high side?

or does it reference to ground of the dc bus.


the parts were pulled from a danfoss vlt5000 11kw drive and have snubbers connected with 15volt zeners across the gate to emitter with a 7ohm resistor in series with the gate.


what i am doing is making a capicitive discharge spot welder i have 2 igbts joined together with a 450volt 6600 uf capicator and then using the two center bridge terminals into a step down transformer to the low voltage (safe) welding electrodes.


this shuld give me 600 joules of welding power 1/2 cv^2 enough to spot weld up battery packs for drills and rc cars etc...


i then hope to switch the igbt's at say 4.5khz into the step down transformer and get out roughly 24volts and with lead ristance of aprox 2m 4awg will give me a current og 86 amps.


any one able to help me with the igbt operation would be great.


i have lots of igbt as we are a service agent for danfoss new zealand and i had some lying parts lying around and thuught this would be a good project so i can weld up my lithium polymer rc battery packs.


if any one can help me get this working i could fire you some igbt blocks and faulty power cards from danfoss drives.

Link to comment
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
  • Create New...