Mini UPS PCB Design

flux

0:59

Considering tool usage for issues.

Running design review.

Analyzing the schematic.

Addressing power output concerns.

Running design review.

I fixed the actionable ERC issues and checked ERC again.
What I fixed
  • Added intentional no-connect markers to the unused status pins on U1 and U2
  • Added intentional no-connect markers to the isolated mounting holes H1, H2, H3, and H4
That cleared all the floating-pin warnings. Using the review tool is the correct way to check ERC/DRC status, and those checks update automatically in Flux
Current ERC result Remaining issue
  • Power input not driven: U3 VCC on HV_BUS
What this means
This remaining ERC error is not necessarily a real wiring mistake.
Right now HV_BUS is fed through the ideal-diode path:
ERC is looking for a pin typed as a formal power-output driver. In this topology, the bus is being supplied through analog power-path parts, so ERC may not recognize that as a conventional driven power source even though the connectivity is valid. The project inspection tools are the right source for confirming the actual net connections

Status summary

CheckStatus
Floating pinsFixed
No-connect violationsClean
Pin-to-pin conflictsClean
Shorted componentsClean
Undriven netsClean
Single-pin netsClean
Missing power on U3 VCCStill flagged
Practical recommendation
At this point:
  • the review noise is cleaned up
  • the only remaining ERC item is the U3 power-source classification issue
If you want, I can do one of these next:
  1. Inspect the exact HV_BUS path around U1, U2, Q1, Q2, and U3 and tell you whether the remaining ERC error is safe to ignore
  2. Help you fix the remaining schematic-quality issues beyond ERC, like net naming and final connection cleanup
Inspect HV_BUS path
Clean schematic issues
Check if safe
3 days

Applied changes.

0:02

nets {

net BATTERY_IN = Q2:S, R3:P1, R4:P1, U2:IN, C2:P1, F2:2;

net GND = D3:A, J4:PIN2, J3:Neg, R5:P2, U3:GND, C8:P2, R6:P2, C3:P2, Q4:E, C1:P2, Q3:E, C2:P2, C4:P2, C7:P2, U2:GND, U2:OFF, J2:Terminal, U1:GND, U1:OFF, J1:Terminal, R1:P2, D2:A, D1:A;

net Net 2 = U2:GATE, Q2:G;

net ADAPTER_IN = R2:P1, R8:P1, Q1:S, F1:2, C1:P1, U1:IN;

net HV_BUS = C4:P1, C3:P1, Q1:D, U1:OUT, U3:EN, U3:VCC, U2:OUT, Q2:D;

net gate_driver_mosfet_1 = Q1:G, U1:GATE;

}

3 days
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U1
  • Ground
    Ground
    A common return path for electric current. Commonly known as ground.
    jharwinbarrozo
    20.5M
  • Net Portal
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    Wirelessly connects power nets on schematic. Identical to the net portal, but with a power symbol. Used to organize schematics and separate functional blocks. To wirelessly connect power net portals, give them the same designator. #portal #power
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  • Generic Resistor
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  • Generic Capacitor
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    A generic fixed capacitor ideal for rapid circuit topology development. You can choose between polarized and non-polarized types, its symbol and the footprint will automatically adapt based on your selection. Supported options include standard SMD sizes for ceramic capacitors (e.g., 0402, 0603, 0805), SMD sizes for aluminum electrolytic capacitors, and through-hole footprints for polarized capacitors. Save precious design time by seamlessly add more information to this part (value, footprint, etc.) as it becomes available. Standard capacitor values: 1.0pF, 10pF, 100pF, 1000pF, 0.01uF, 0.1uF, 1.0uF, 10uF, 100uF, 1000uF, 10000uF 1.1pF, 11pF, 110pF, 1100pF 1.2pF, 12pF, 120pF, 1200pF 1.3pF, 13pF, 130pF, 1300pF 1.5pF, 15pF, 150pF, 1500pF, 0.015uF, 0.15uF, 1.5uF, 15uF, 150uF, 1500uF 1.6pF, 16pF, 160pF, 1600pF 1.8pF, 18pF, 180pF, 1800pF 2.0pF, 20pF, 200pF, 2000pF 2.2pF, 22pF, 220pF, 2200pF, 0.022uF, 0.22uF, 2.2uF, 22uF, 220uF, 2200uF 2.4pF, 24pF, 240pF, 2400pF 2.7pF, 27pF, 270pF, 2700pF 3.0pF, 30pF, 300pF, 3000pF 3.3pF, 33pF, 330pF, 3300pF, 0.033uF, 0.33uF, 3.3uF, 33uF, 330uF, 3300uF 3.6pF, 36pF, 360pF, 3600pF 3.9pF, 39pF, 390pF, 3900pF 4.3pF, 43pF, 430pF, 4300pF 4.7pF, 47pF, 470pF, 4700pF, 0.047uF, 0.47uF, 4.7uF, 47uF, 470uF, 4700uF 5.1pF, 51pF, 510pF, 5100pF 5.6pF, 56pF, 560pF, 5600pF 6.2pF, 62pF, 620pF, 6200pF 6.8pF, 68pF, 680pF, 6800pF, 0.068uF, 0.68uF, 6.8uF, 68uF, 680uF, 6800uF 7.5pF, 75pF, 750pF, 7500pF 8.2pF, 82pF, 820pF, 8200pF 9.1pF, 91pF, 910pF, 9100pF #generics #CommonPartsLibrary
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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