Hi,
I have a problem. I am making a mobile robot. (So the delicious official wall plug is not feasible)
My power source is a 12V 3S2P Li-ion battery. (Actually from 12.6V to 8.7V depending of the battery charge, each individual cell can provide up to 35A)
The Raspberry pi 5 use 5A at 5V. I need to convert that 12VDC into usb-c 5V 5A.
I want to power the raspberry pi via the usb-c port because there is a power protection circuit on the raspberri pi. (So powering it via the GPIO is out of the question) (I don't want to put a board on top of the GPIO too..)
I have bought a 5~24VDC to 5VDC 5A step-down buck converter (high quality, the jitter its apparently around +-30-40mV max), but I don't know how to transform the 2 wires 5VDC (+ and -) into a USB-C connector that will provide power to the Raspberry Pi (bonus if it can tell that it can support 5V at 5A via the Power Delivery protocol (even if its -cheating- non standard)). (As I understand I can bypass the Power Delivery protocol handshake via a config on the Raspberry pi 5 : viewtopic.php?p=2153486&hilit=usb_max_c ... 1#p2153486).
I don't know if it exist a DC to USB-C adapter to power the USB-C part. (The other way work for sure and I made some research and some people say that it can't work (only provide 5V and a few mili-amp or is not safe) because it need a power delivery protocol). I might solder and modify a usb-c cable but I don't know how to do it (and I don't want to make a mistake)....
I found two adapters that may do what I want :
- https://www.dell.com/en-us/shop/dell-ad ... ccessories (no datasheet but provide usb-c "5 to 12V" from a DC Power Jack)
- https://slimq.life/products/dc-to-usb-e ... r-150w-240 (3A at 5V instead of 5A at 5V dammit...)
- There is a lot of generic board that can do 3A at 5VDC to USB A but USB A can only transfer 3Amp max (and there is no 5A cable that exist because its not compliant with usbA standard) so a usb-a to usb-c adapter is not possible I think.
Also someone fried his raspberry pi with a buck converter viewtopic.php?p=2189168&hilit=buck+converter#p2189168 (this horror story is one of the reason I would prefer a proper Power Delivery protocol solution)
I can use power jack or solder its not a problem.
I really want/need the 5A because I need to power a hungry accessory (a Intel RealSense Camera that need a budget of around 2A to be safe and stable)
Also, the adapter will be directly on the 12VDC rail that provide power to the hungry DC Motors driver board and everything else. (There is no filter between the battery and the 12V rail).
I have very limited space too.. max 7cm of Width (on the smaller side) (overall smaller is better).
And... I really don't want to burn or damage my raspberry pi and it need to be "stable" over a long period of time...
So, is there a proper solution (which is stable) ( a adapter) to power a Raspeberri pi 5 at 5Amp 5V from 12VDC ? As Anyone succeed ?
Thank you very much for your help or answer.
Ertuit.
I have a problem. I am making a mobile robot. (So the delicious official wall plug is not feasible)
My power source is a 12V 3S2P Li-ion battery. (Actually from 12.6V to 8.7V depending of the battery charge, each individual cell can provide up to 35A)
The Raspberry pi 5 use 5A at 5V. I need to convert that 12VDC into usb-c 5V 5A.
I want to power the raspberry pi via the usb-c port because there is a power protection circuit on the raspberri pi. (So powering it via the GPIO is out of the question) (I don't want to put a board on top of the GPIO too..)
I have bought a 5~24VDC to 5VDC 5A step-down buck converter (high quality, the jitter its apparently around +-30-40mV max), but I don't know how to transform the 2 wires 5VDC (+ and -) into a USB-C connector that will provide power to the Raspberry Pi (bonus if it can tell that it can support 5V at 5A via the Power Delivery protocol (even if its -cheating- non standard)). (As I understand I can bypass the Power Delivery protocol handshake via a config on the Raspberry pi 5 : viewtopic.php?p=2153486&hilit=usb_max_c ... 1#p2153486).
I don't know if it exist a DC to USB-C adapter to power the USB-C part. (The other way work for sure and I made some research and some people say that it can't work (only provide 5V and a few mili-amp or is not safe) because it need a power delivery protocol). I might solder and modify a usb-c cable but I don't know how to do it (and I don't want to make a mistake)....
I found two adapters that may do what I want :
- https://www.dell.com/en-us/shop/dell-ad ... ccessories (no datasheet but provide usb-c "5 to 12V" from a DC Power Jack)
- https://slimq.life/products/dc-to-usb-e ... r-150w-240 (3A at 5V instead of 5A at 5V dammit...)
- There is a lot of generic board that can do 3A at 5VDC to USB A but USB A can only transfer 3Amp max (and there is no 5A cable that exist because its not compliant with usbA standard) so a usb-a to usb-c adapter is not possible I think.
Also someone fried his raspberry pi with a buck converter viewtopic.php?p=2189168&hilit=buck+converter#p2189168 (this horror story is one of the reason I would prefer a proper Power Delivery protocol solution)
I can use power jack or solder its not a problem.
I really want/need the 5A because I need to power a hungry accessory (a Intel RealSense Camera that need a budget of around 2A to be safe and stable)
Also, the adapter will be directly on the 12VDC rail that provide power to the hungry DC Motors driver board and everything else. (There is no filter between the battery and the 12V rail).
I have very limited space too.. max 7cm of Width (on the smaller side) (overall smaller is better).
And... I really don't want to burn or damage my raspberry pi and it need to be "stable" over a long period of time...
So, is there a proper solution (which is stable) ( a adapter) to power a Raspeberri pi 5 at 5Amp 5V from 12VDC ? As Anyone succeed ?
Thank you very much for your help or answer.
Ertuit.
Statistics: Posted by Ertuit — Sat Feb 10, 2024 1:09 pm