Floating Copper Detection Help

flux

I checked the current project state, and the current Floating Copper review is passing — it shows “Floating Copper” status: Success right now. The review system in Flux is the right place to confirm this kind of issue, and it reports the floating-copper check as up to date.
That said, your project history does show an earlier floating-copper problem associated with Trace auto, and the disconnected items tied to that earlier state were around:
What this usually means
A Floating Copper error means there is a PCB copper object with no real net connection:
  • a short stray trace segment
  • an orphan via
  • a tiny isolated fill island
Fastest way to fix it
In PCB view:
  1. Click the review item for Floating Copper / Trace auto.
  2. Zoom to the flagged object.
  3. If it is a stray route stub or tiny orphan trace, delete it.
  4. If it is supposed to belong to a net, reconnect it so it touches the correct pad/trace continuously.
  5. If it is an isolated fill island, either:
    • remove that fill piece, or
    • make sure the fill is actually tied into the intended net.
In your design, the most suspicious earlier areas were Earlier flagged areas

Table

ItemEarlier issue
L1output-side copper around 12V_OUT
F2isolated battery LED source copper
R4isolated LED anode copper
R5previously isolated pad/trace
J1 + H4earlier isolated copper/net fragment
Important note
Because the current review now passes, the problem may already be fixed, or the flagged copper object was removed/changed since the error appeared.
If you still see the review entry in the UI, refresh the review panel or click back into the PCB canvas and re-check it. Flux’s review system is the authoritative source for whether the floating copper still exists.
If you want, I can help you narrow it down further by checking one suspect area at a time, starting with L1 and the 12 V output section.
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Design Notes
Scope
Design a mini UPS PCB that accepts:
  • External 42 V adapter input
  • External 10S lithium battery pack input (30 V to 42 V nominal operating range with pack/BMS external)
The board shall:
  • Prioritize the adapter when present
  • Automatically switch to the battery when the adapter is absent or lower than the battery path
  • Generate an HV_BUS in the 30 V to 42 V range
  • Regulate HV_BUS down to 12 V for the output stage
  • Include status LEDs for source indication
  • Include battery monitor pads for external sensing
The board shall NOT include:
  • Onboard battery charging circuitry
  • Battery pack design
  • Adapter power supply design
Functional Blocks
  1. Adapter Input
  2. Battery Input
  3. Protection and reverse/current blocking
  4. Ideal-diode OR-ing / automatic switchover
  5. HV_BUS (30 V to 42 V)
  6. 12 V buck output stage
  7. Monitoring and status indicators
Initial Design Choices
  • Use ideal-diode controllers with external MOSFETs rather than Schottky OR-ing to minimize loss.
  • Use a synchronous buck stage for 12 V generation from the 30 V to 42 V bus.
  • Use TVS + fuse protection on both external high-voltage inputs.
  • Use a 4-layer PCB as the default safer option for power integrity and routing flexibility.
Open Implementation Assumptions
  • Continuous 12 V output target assumed at up to 2 A based on prior discussion.
  • External battery pack includes its own BMS/protection.
  • Battery monitor pads are voltage-monitor taps only unless a future current-sense stage is added.
Implemented Schematic Snapshot
  • Adapter input is J1 through F1 and D1 into U1 and Q1.
  • Battery input is J3 through F2 and D2 into U2 and Q2.
  • The shared HV bus feeds U3 with local bypass C3 and C4.
  • The 12 V output stage uses L1, C7, C8, R6, and R7.
  • Monitor pads J4 and J5 expose battery positive and ground.

    Scope

    Functional Blocks

    Initial Design Choices

    Open Implementation Assumptions

    Implemented Schematic Snapshot

Documents

    Design Notes

Assets

Assets are files uploaded to this project which can be used in various ways.

Mini UPS 42V to 12V thumbnail
Mini UPS PCB for a 42 V external adapter and external 10S lithium battery pack. Includes adapter-priority source selection with automatic switchover, input protection, ideal-diode OR-ing, a 30 V to 42 V HV bus, and a regulated 12 V output stage. Includes status LEDs and battery monitor pads. Excludes onboard charger circuitry and excludes adapter or battery source design.

Properties

Pricing & Availability

Distributor

Qty 1

Arrow

$39.97–$40.80

Digi-Key

$1.75–$2.47

LCSC

$17.95–$17.97

Mouser

$42.87

TME

$0.43

Verical

$0.97–$2.63

Controls