So far, this is the most promising: https://www.electro-tech-online.com/custompdfs/2012/02/slva464c.pdf
Note it's divided into 3 sections: Input protection, power supply and Charge controller.
Upgrading the input protection for higher current is probably doable. Now take an already built 12 to 5V converter and use the USB controllers depicted in the app note for each port.
Hopefully, after seeing how this device is built and how your ciggy device is built, you can understand the need for complexity.
That input protector that you found earlier might also work.
The automotive DC-DC converter would be the hardest to make, so if you can buy, do so.
Now you need the charge port controller so you can get the max power from each port.
In reality, the USB current is limited to 0.5 A UNLESS there is some sort of gizmo that implements a dedicated charge port.
These devices are expensive that your connecting, so you do have to invest in power protection.
To give you the idea of the value of power protection, I had a custom MACintosh system at work doing laboratory data acquisition. If this machine went down, we would effective halt our research line and that's all we did. Nearly everything was processed by this machine.
When developing we implemented redundancy. There were two of everything. The second tester was mobile. If any instrument went bad, it was a swap and send out for repair. The $20K light source was exempt. We only had one of these.
The computer had zero problems in the 15 years in operation except for a floppy drive and periodic internal cleaning to get rid of the dust. I did spend $1500 to protect a $1500 computer+$5000 USD of instrumentation.
The loss of the equipment would be much more per day.
The lamp had it's own problems. A full week (scheduled) to upgrade the power supply. I essentially told the manufacturer that there is no way any respectable company did this. They put a 10 A rectifier in a system that needed a 40 A rectifier. They did the transformer mod for free.
The ellipse had to be replaced inside of the light housing because of age and crazing of the coating and the ignition system had to be put internal to the housing. This was not something that we had the expertise to do.
The downtime was scheduled.
The $1000 lamp was replaced once per year and we always had a spare. You have to wear padded clothing, gloves and a full face shield and you can't touch the lamp with your hands. The lamp is pressurized to 20 atmospheres. A fingerprint is inviting an explosion.
Note it's divided into 3 sections: Input protection, power supply and Charge controller.
Upgrading the input protection for higher current is probably doable. Now take an already built 12 to 5V converter and use the USB controllers depicted in the app note for each port.
Hopefully, after seeing how this device is built and how your ciggy device is built, you can understand the need for complexity.
That input protector that you found earlier might also work.
The automotive DC-DC converter would be the hardest to make, so if you can buy, do so.
Now you need the charge port controller so you can get the max power from each port.
In reality, the USB current is limited to 0.5 A UNLESS there is some sort of gizmo that implements a dedicated charge port.
These devices are expensive that your connecting, so you do have to invest in power protection.
To give you the idea of the value of power protection, I had a custom MACintosh system at work doing laboratory data acquisition. If this machine went down, we would effective halt our research line and that's all we did. Nearly everything was processed by this machine.
When developing we implemented redundancy. There were two of everything. The second tester was mobile. If any instrument went bad, it was a swap and send out for repair. The $20K light source was exempt. We only had one of these.
The computer had zero problems in the 15 years in operation except for a floppy drive and periodic internal cleaning to get rid of the dust. I did spend $1500 to protect a $1500 computer+$5000 USD of instrumentation.
The loss of the equipment would be much more per day.
The lamp had it's own problems. A full week (scheduled) to upgrade the power supply. I essentially told the manufacturer that there is no way any respectable company did this. They put a 10 A rectifier in a system that needed a 40 A rectifier. They did the transformer mod for free.
The ellipse had to be replaced inside of the light housing because of age and crazing of the coating and the ignition system had to be put internal to the housing. This was not something that we had the expertise to do.
The downtime was scheduled.
The $1000 lamp was replaced once per year and we always had a spare. You have to wear padded clothing, gloves and a full face shield and you can't touch the lamp with your hands. The lamp is pressurized to 20 atmospheres. A fingerprint is inviting an explosion.
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