Hello friends,
I am attempting to design a 1 kW induction heater operating at 979Hz. Two IRFP250N mosfets are operating in Push-Pull. The parallel resonating capacitor of 33uF is on the primary side. The 2uH induction coil is on the secondary side. The Push-Pull transformer has a split primary and the primary to secondary turns ratio is 20:1. The power supply voltage is 60V DC. I have been simulating the circuit in LTSpice.
My simulation shows a sharp current spike on mosfet switch ON. My question is, how can I eliminate/greatly reduce this spike.
I have uploaded a zip file, which contains the LTspice *.asc file for the simulation, the *.spi file for the IRFP250N and a screendump of the simulation which shows the current spike. In practice I will be using a bank of 2 or 3 IRFP250s per split primary, but for the present I would like to know how to remove/reduce the current spike. Many thanks in advance!
NB: Please amend the spice directive giving the location of the IRFP250N spi file in the Inductheat_1.asc simulation file to match the actual location of the file on your computer.
I am attempting to design a 1 kW induction heater operating at 979Hz. Two IRFP250N mosfets are operating in Push-Pull. The parallel resonating capacitor of 33uF is on the primary side. The 2uH induction coil is on the secondary side. The Push-Pull transformer has a split primary and the primary to secondary turns ratio is 20:1. The power supply voltage is 60V DC. I have been simulating the circuit in LTSpice.
My simulation shows a sharp current spike on mosfet switch ON. My question is, how can I eliminate/greatly reduce this spike.
I have uploaded a zip file, which contains the LTspice *.asc file for the simulation, the *.spi file for the IRFP250N and a screendump of the simulation which shows the current spike. In practice I will be using a bank of 2 or 3 IRFP250s per split primary, but for the present I would like to know how to remove/reduce the current spike. Many thanks in advance!
NB: Please amend the spice directive giving the location of the IRFP250N spi file in the Inductheat_1.asc simulation file to match the actual location of the file on your computer.