ESP32-WROOM-32
Industrial High Reliability Power Supply
Overview
A high reliability power supply circuit utilizing the LM1137H for industrial automation, featuring AC mains input, transformer/rectifier stages, and basic status flags for Power Good and Fault monitoring in a 19-inch rackmount enclosure.
avi acharyaSystem architecture
POWER
MCU
- POWER → MCUPowerPower supply
Bill of materials
| Part number | Type | Component | Manufacturer | Package | Qty | Datasheet | Match |
|---|---|---|---|---|---|---|---|
| UJ31-CH-314-SMT-TR | POWER | USB-C Power Jack Power input | Cui Devices | Tape & Reel (TR); Cut Tape (CT); Digi-Reel® | 1 | Matched | |
| ESP32-WROOM-32 | MCU | ESP32-WROOM-32 Main controller | Espressif Systems | Reel | 1 | Matched | |
2 alternatives consideredAI verified | |||||||
Build guide
6-8 hoursAdvanced
1
Procurement & Preparation
- Procure all BOM components including the USB-C Power Jack (UJ31-CH-314-SMT-TR) and ESP32-WROOM-32 module, alongside the LM1137H regulator, 19-inch rackmount enclosure, step-down transformer, rectifier diodes, and status flag monitoring passives.
- Inspect the 19-inch rackmount enclosure and prepare the internal baseplate for mounting the AC mains terminal block, transformer, rectifier stage, and main PCB containing the LM1137H and ESP32-WROOM-32.
2
Hardware Assembly & Wiring
- Solder the USB-C Power Jack (UJ31-CH-314-SMT-TR) and the ESP32-WROOM-32 module onto the main control PCB, ensuring proper alignment of power and ground pads.
- Assemble the high reliability power supply circuit featuring the LM1137H regulator, AC mains input terminal, step-down transformer, and bridge rectifier stages on the main PCB.
- Establish internal wiring connections linking the USB-C Power Jack (POWER) to the ESP32-WROOM-32 (MCU) via the 5V and GND interface signals, and wire the Power Good and Fault monitoring status flags to designated GPIO pins.
3
Firmware Setup
- Connect a USB programming cable to the ESP32-WROOM-32 module and flash the base firmware configured to monitor Power Good and Fault status flags from the LM1137H circuit.
- Run initial diagnostic firmware routines to verify that the ESP32 successfully reads the hardware status flags and communicates over the serial interface.
4
Testing & Calibration
- Perform a preliminary continuity and isolation test across the AC mains input, transformer stages, rectifier output, and LM1137H regulation circuit using a digital multimeter.
- Apply AC mains power to the 19-inch rackmount enclosure and measure regulated output voltages, verifying normal operation and correct triggering of Power Good and Fault status flags under load.
Document
Industrial High Reliability Power Supply
A high reliability power supply circuit utilizing the LM1137H for industrial automation, featuring AC mains input, transformer/rectifier stages, and basic status flags for Power Good and Fault monitoring in a 19-inch rackmount enclosure.
Design Overview
| Item | Details |
|---|---|
| Product Type | High Reliability Power Supply |
| Key Functions | AC mains power conversion via transformer and rectifier, Regulated DC output utilizing LM1137H, Power Good status flag monitoring, Fault detection and status indication |
| Power Source | AC mains with standard transformer/rectifier |
| Connectivity | Power Good Status Flag, Fault Status Flag |
| Size | Standard 19-inch rackmount chassis |
| Environment | Industrial automation and control |
| Difficulty | Advanced |
| Est. Time | 6-8 hours |
System Architecture
Power Topology: USB-C 5V → MCU 3.3V LDO
Module List
| Module ID | Type | Name | Function | Voltage |
|---|---|---|---|---|
| POWER | POWER | USB-C Power Jack | Power input | 5V |
| MCU | MCU | ESP32-WROOM-32 | Main controller | 3.3V |
Design Schemes
High Reliability Power Supply ★
Key IC selection
main controller and telemetry processor
- Need: Wi-Fi/BLE connectivity, dual-core processing, and robust GPIO for monitoring Power Good flags and fault indicators in a high-reliability environment.
- Class: IoT Module / Wi-Fi + BLE Microcontroller
- Shortlist: Espressif ESP32-WROOM-32, Silicon Labs Si917
- Pick: Select based on module certification, industrial temperature range (-40°C to +85°C), and availability of stock in the corporate BOM catalog.
high-reliability DC voltage regulation
- Need: Provide tightly regulated DC output from the rectified AC stage with high thermal stability and transient response for sensitive loads.
- Class: High-Voltage Low Dropout (LDO) Regulator / Linear Regulator
- Shortlist: TI LM1137H, Analog Devices LT1963A series
- Pick: Select based on input voltage rating, maximum output current capability, package thermal resistance, and high-reliability screening grade.
Risk register
| ID | Area | Severity | Detail | Mitigation |
|---|---|---|---|---|
| r1 | thermal | high | High voltage drop across the LM1137H linear regulator during AC mains fluctuations can lead to excessive junction temperature rise in a closed enclosure. | Perform detailed worst-case thermal dissipation calculations, ensure adequate copper pour area on the PCB, and evaluate heatsink requirements for the regulator package. |
| r2 | power | high | Transient overvoltages on the AC mains could propagate through the rectifier stage and damage downstream low-voltage logic and the ESP32-WROOM-32. | Implement robust transient voltage suppressors (TVS), MOV protection on the AC input, and galvanic isolation where appropriate between the primary power stage and the MCU control domain. |
| r3 | emi | med | Switching noise or rectifier recovery spikes may couple into the MCU analog/digital lines, triggering false fault detection or Power Good status flags. | Use proper PCB layout techniques including split ground planes, localized decoupling capacitors, and hardware filtering on the Power Good monitoring lines. |
Key Components
2/2 modules matched to real parts. See the BOM tab for the full component table.
USB-C Power Jack (UJ31-CH-314-SMT-TR)
The candidate matches the primary MPN (UJ31-CH-314-SMT-TR) and manufacturer (Cui Devices) for the USB-C power jack.
ESP32-WROOM-32 (ESP32-WROOM-32)
Candidate 1 matches the primary MPN 'ESP32-WROOM-32' exactly and is manufactured by Espressif Systems.
Build Summary
- Difficulty: Advanced
- Estimated time: 6-8 hours
- Tools required: SMD Soldering Iron, Soldering Station, Digital Multimeter, Digital Oscilloscope, Wire Strippers, Crimping Tool
See the Build tab for the full step-by-step assembly guide.
Generated by YuanQi AI Design System · Query: Design a high reliability power supply circuit using LM1137H