# how to do impedence matching for the coil and the source?

#### Vishnu Rj

Joined May 3, 2017
1
hi,
I'm working on a induction heater , with 3 phase input ,the dc what I feed will be 630volts, current will vary from 15 to 30 amps.which is being switched to 5khz with the inverter, the coil has an impedance of 0.816ohm at 5khz and a inductance of 5.50uH, I'm not able to figure out the transformer ratio .I hope my question is clear. please suggest any calculations to solve this matching problem.

#### Deleted member 440916

Joined Dec 31, 1969
0
hi,
I'm working on a induction heater , with 3 phase input ,the dc what I feed will be 630volts, current will vary from 15 to 30 amps.which is being switched to 5khz with the inverter, the coil has an impedance of 0.816ohm at 5khz and a inductance of 5.50uH, I'm not able to figure out the transformer ratio .I hope my question is clear. please suggest any calculations to solve this matching problem.
Hi Vishnu, is the current your quoting on the 630V supply side or the coil current, or whats the inverter rating in VA or Watts ?

#### drc_567

Joined Dec 29, 2008
1,156