I have a lenovo yoga 730 13-ikb without a charger, it uses TYPE C usb charger with PD
specifications for the charger in online stores are:
AC Input: 100-240V ~ 1.5A 50-60Hz DC Output: 20V 3.25A (65 watt charger)
Laptop Specs sheet say:
AC adapter 65W USB Type-C AC adapter
I was thinking of creating a DIY charger with 20V power pins and 65w from some other source.
Can I damage the USB C port or the laptop at all if I don't do it with the Power Delivery specs, I mean does it need it to be PD compliant or giving it the required power as the spec says be good to go without worrying that it will only work for this laptop and nothing else?
I don't care if it does not work for my phone or any other lower consumption device, I don't want it to be a universal USB type C charger, just want t to charge this specific laptop.
is Power Delivery supposed to be switching voltages once it is powering the laptop , maybe for powering different parts of it, or once negotiated it continually delivers settled voltage until disconnection?
Can I Bypass the negotiation of power by bridging some pins or somehow modify it so it just goes with single power available, is negotiation mandatory?.
I have seen more questions with answers in but apparently all talk about a charger compliant with PD, my goal is not to create a PD charger, just directly be able to charge the laptop.
Update
While checking the service manual I found this 
so apparently it always has the 20V to start with, does anybody know if PD chargers output by default the maximum power?
Best Answer
This laptop model only has USB-C PD charging option. PD has controller on each side of the connection (inside the charger and inside the laptop) and those two controllers will negotiate voltage/current. This negotiation is a must in PD connections.
Initial connection happens at standard USB 5V/max 0.5A, where devices then negotiate V/I increase in specific steps. PD protocol is rather complex and if you were to try to feed it permanent 20V DC it most likely will burn PD controller inside the laptop.
Just get any USB-C PD charger capable of minimum 65W (that is what you laptop rated at), and it should work.