HP Laptop Charger 3 Pin-Out Explained and diy 12v charger

you can see in this video meaning of 3 pins in HP laptop chargers and how I made 12c diy charger.
At 45w charger I measured from the conectror 500k.If u have the values for 90w and 120w pls put in a coment.
150W=120KOhm, 120W=180KOhm, 90W=294KOhm, 65W=383KOhm, 45W=500KOhm