Electrical Engineering Stack Exchange
Electrical Engineering Stack Exchange

Questions tagged [power-delivery]

44 questions
7
votes
1 answer

Implementing USB-C PD PHY directly into micro-controller

I want to explore more USB-C PD, in particular Programmable Power Supply (PPS), to supply my projects with power. There are some good projects1 using some standard communication (e.g. SPI or I2C) to communicate to as dedicated IC (e.g. STUSB4500,…
3244611user
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5
votes
1 answer

USB C PD fast power role swap

I'm currently designing a device, which consists of a STM32 microcontroller with USB 2.0 support, USB 2.0 hub and few dimmable leds. STM is connected to the hub, along with few other devices. Hub is then connected to a smartphone via a USB-C…
Mateusz Kowalik
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3
votes
2 answers

Crossing USB Type-C wires on debug probe

I plan to make debug probe that allows me analyze traffic on USB Type-C cable. I want to make blue middle board from the following schametic: From my point of view right port of the my board is upstream (UFP) and left is downstream (DFP). Do I need…
Misaz
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3
votes
4 answers

Always-on socket in-between a 2-way switch?

I have access to a power cable that powers devices through a 2-way switch, basically: Is it possible to add an always-on socket in between using L1, L2 and N? The problem is that either L1 or L2 is live at a given time and, obviously, they cannot…
Pranasas
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2
votes
1 answer

Can USB-C PowerDelivery be restricted to manufacturers devices?

I have recently searched for a new monitor. I'd like to have a single-cable setup via USB-C, so I need a monitor that supports PowerDelivery. I found a good match (from HP) but looking into reviews on it I read that the full potential of…
Lens
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2
votes
3 answers

How do bypass capacitors recharge in high-frequency if the PCB can't deliver high-frequency currents?

I understand the whole theory behind bypass capacitors, how they are necessary to deliver high-frequency currents to the IC, as the PCB in general has high-inductance, thus high-impedance in high-frequencies. This graph shows the PCB impedance on…
mFeinstein
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2
votes
0 answers

USB Type-C DRP Integrated Switch/Interface Chip

I would like to experiment with a power bank design with a single usb type-c port. The port should have dual role, source current for charging other devices as well as sink current for charging itself. So far I've looked at various chips that can…
Florin C.
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1
vote
0 answers

Why does Backside Power Distribution work for high speed CPUs?

Several upcoming or future CMOS process nodes are said to offer some kind of backside power delivery for Silicon CMOS transistors, so the precious area in the lower metal layers is freed up for signal interconnects increasing integration density.…
tobalt
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1
vote
1 answer

I'm having issues with multiple regulator power delivery design

The device I'm designing consists of an STM32F405, a few 3V peripherals, and a few 5V peripherals. The device is is powered off of a 12700 Li-ion battery. The first regulator is a buck/boost that is directly connected to the input of the battery and…
Erric DiFilippo
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1
vote
1 answer

FTDI Debugger Load Switching

I’m developing a new version of a custom debugger board for my project. The debug target is a solar powered device, which means sometimes I want to power it from the host (debugger) and sometimes I want to disconnect the host power and let the…
Jakub Nagy
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1
vote
1 answer

Do devices not tolerating swapping live and neutral exist?

Multiple types of domestic power sockets around the world (including the ones in my country) do not distinguish between live and neutral even when ground is present. I am shopping for an AC-DC PSU and almost every product from reputable brands,…
DarioP
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1
vote
0 answers

USB-C power delivery, how to power 20V pd device from "dirty" +20V source?

I want to charge my laptop from a solar pv panel. It charges via USB-C and so I bought a cheapo usb solar panel off ebay and a "power bank". Turns out, the "power bank" is only for phones and other 5V devices. And the solar cell can output a maximum…
Smyther
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1
vote
0 answers

USB C PD source not powering simple USB 2.0 sink

I made a simple PCB that I wanted to be powered through a USB C connector with low current requirements (~50mA). I spent some time reading through the USB C Spec as well as reading other relevant questions on this forum and it seemed like the answer…
Colin
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1
vote
1 answer

USB-C and >5V Power Supply

I have a question about power supplies and Power Delivery on USB-C. I'm trying to understand the USB-C specification, Power Delivery, UFP and DFP, DRP... but this is a nightmare. There are not clarifying examples on the USB-C Specification, only a…
Juanma
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1
vote
2 answers

Creating a USB charger from 2-wire DC

I'm trying to tackle a problem where I want to wall-mount a USB device on a brick wall that only has a single 2-wire (14AWG) cable available, and no room / capability to run a new cable or remove the current one (have tried both - it's an old house,…
Dominik
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