fabgrid

My original final project proposition:

A distributed, modular, DC lab power supply

One or a few central power supply units provide 5V, 12V, and 24V which are made available throughout the entire faciliy via surface-mounted wiring. Different types of outlets can provide any other (low) DC voltage and some extra features like monitoring, protection, or regulation.

Why fabgrid?

When all outlets are occupied with power adapters, aren't we just using the wrong power grid?

Many devices that we use daily need a power adapter in order to operate on AC current at 110 or 230 V, as typically provided by the outlets installed in our houses. This project is meant to develop a system for creating a paralell, low-voltage DC-power grid with respect to the requirements and capabilities of a fablab. Yet, the system is intended to be used in homes and other professional enviroments equally.

Structure

CPU (Central Power Unit)

Grid

Distribution grid (flush- or wall-mounted)

Access grid (wall-mounted)

Outlets

Monitoring

Challenges

  • Find the right tradeoff between price and power dissipation when calculating the cross section of the copper required for the grid
  • Protect connected devices from other devices accidentially causing power spikes
  • Ensure a smooth and stable DC signal
  • Make it easy to install

Roadmap

  1. Specification (Distances, voltages, max currents)
  2. Electrical Design
    • Rough schematic of the entire system
    • Schematic for a basic outlet
  3. Mechanical Design
    • Conductor
      • Geometry
      • Joints
      • Wall mounts
    • Outlets
      • Electric joints
      • Case