Update: 

• Changed some values of components in the loop filter to give a more stable output. 
• Fixed ground net

Basically Uzzors induction heater driver with PLL control http://uzzors2k.com/index.php?page=pllinductionheater1

Here is a simulation on Falstad on how it works https://tinyurl.com/ydqw2wub

the output of the driver will feed into this https://www.aliexpress.com/item/33061418764.html? which will drive the IGBTs through a Gate Drive Transformer

you can also just buy this, its basically the same circuit as this, but you need to replace the timing capacitor on pins 6 and 7 of the 4046 with a 1n capacitor to bring the frequency down. https://www.aliexpress.com/item/4001229731207.html?