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Lenovo Rectangular Power Adapter to 5.5mm Round Jack

Resistance on Signal Pin: 

power rating 	resistance
36 W 	        7,3 kΩ
45 W 	        120 Ω
65 W 	        280 Ω
90 W 	        550 Ω
135 W           1 kΩ
170 W           1.9 kΩ
230 W           4.6 kΩ

https://superuser.com/questions/1246823/lenovo-trim-yellow-rectangular-power-adapter
http://www.thinkwiki.org/wiki/Power_Connector#slim_power_tips