PCB Feasibility
Thought for 1 min 50 sec
PCB layout placement is done and ready for your review.
Accomplished:
- Resized the board to 260 × 180 mm with a 4-layer stackup.
- Placed all PCB components by functional block: high-current phases, control/ADC, auxiliary regulators, contactor I/O, CAN/JTAG, and edge connectors.
- Replaced U18 with the compatible TPS3431-Q1 variant because the original TPS3431SDRBR footprint had a blocking copper-overlap issue; I filed an internal part-quality report.
- Placement/pre-routing checks are now clean except for routing advisories that are expected and not blocking.
Open items:
- I stopped before routing at the normal placement-to-routing checkpoint.
- TPL9202 is still not suitable for real 24 V contactor coils; replace that driver approach before final PCB release.
- High-current power paths will need copper pours/bus geometry, not just thin auto-routed traces.
Suggested next steps:
- Review the component placement in PCB view.
- If placement looks good, tell me “route it” and I’ll start routing.
- After routing, run DRC/airwire cleanup and then review high-current copper widths/thermal areas.
route it
Thought for 17 sec
I’ll route the PCB now: run the routing pre-check, set conservative trace-width priorities for power/control nets, auto-route the board, then review remaining airwires/DRC issues.
Worked for 33 sec
Routing could not continue because the account currently has no available ACUs, so AI layout/routing tools are unavailable.
Accomplished this session:
- Started the routing phase and prepared the routing checklist.
- Confirmed the intended routing flow: pre-check → set routing rules/width priorities → auto-route → DRC/airwire cleanup.
- Loaded the routing/remediation procedures needed for the next step.
Open items:
- Run routing pre-check again.
- Set power/control routing widths and priorities.
- Run the full-board auto-router.
- Review and fix remaining airwires/DRC issues.
- Add high-current copper/pour strategy after initial routing; auto-routing alone is not sufficient for the 40 A power path.
Suggested next steps:
- Add ACUs to the account.
- Then send “continue routing” and I’ll resume from the routing pre-check.
Continue routing
Set 40A strategy
Manual routing steps
Check DRC airwires
Define net priorities
Safety Analysis — 3 kW Programmable CV/CC Supply
Status
Draft — schematic-stage hazard capture.
Scope
This project involves hazardous energy: up to 100 V DC, 40 A, and 3 kW, plus off-board mains-fed AC/DC modules and contactors. This document is not a certification claim; it is a design-stage safety checklist for review by a qualified power-supply/safety engineer.
Applicable Standards to Review
- UL/IEC 62368-1 or IEC 61010-1 depending final product category and lab/bench use case
- EMC immunity/emissions requirements for industrial/lab equipment
- Local mains wiring, enclosure, fuse, e-stop, creepage/clearance, and touch-safety requirements
Primary Hazards
Table
| Hazard | Source | Initial Mitigation in Architecture | Open Item |
|---|---|---|---|
| Electric shock | 100 V DC output and stored capacitor energy | Output discharge MOSFET/resistor, output contactor, remote/local sense mismatch trip | Confirm enclosure, touch-safe terminals, discharge timing by test |
| Arc/fire | 3 kW bus, 40 A output, contactor matrix faults | Fuses, hard interlocks, precharge, bus brake, hardware trips | Size fuses, traces/busbars, contactors, braking resistor thermals |
| Shoot-through | Four synchronous buck phases | Gate drivers, dead time, ePWM hardware trips | Double-pulse testing, gate resistor/snubber tuning |
| Incorrect series/parallel contactor state | Off-board contactor matrix | Firmware + hardwired interlock + aux contact feedback | Detailed interlock schematic still required |
| Overvoltage on output | Sense lead failure or loop fault | Remote/local sense comparison, OVP thresholds, bus brake | Final comparator thresholds and independent OVP hardware required |
| Thermal runaway | MOSFETs, inductors, shunts, capacitors, brake/discharge resistors | Temperature sensing and fan/fault logic planned | Thermal simulation/prototype measurements required |
Safety-Critical Components / Interfaces
- Off-board AC/DC modules and mains enclosure hardware
- Matrix, output, precharge, and capacitor-bank contactors
- Fuses/breakers and emergency-stop mains contactor
- C2000 trip inputs, total-current comparator, bus/output OVP hardware
- Output discharge and bus brake circuits
Open Safety Work
- Complete hardwired contactor interlock schematic.
- Confirm exact MOSFET, Hall sensor, HV capacitor, and bypass diode parts.
- Define creepage/clearance, PCB stackup, high-current copper/busbar strategy, and enclosure layout.
- Validate one phase before full four-phase assembly.
Status
Scope
Applicable Standards to Review
Primary Hazards
Safety-Critical Components / Interfaces
Open Safety Work