Pocket Portable Solder Fume Extractor

An ultra-compact, pocket-sized solder fume extractor featuring a rechargeable battery, USB-C PD pass-through charging, adjustable fan speed, and an integrated LED strip for hobbyist workstations.

Design Overview

Item	Details
Product Type	Portable Solder Fume Extractor
Key Functions	Quick hobbyist soldering fume extraction, Adjustable fan speed via clicking potentiometer, LED strip lighting with 4-step brightness/power control, Pass-through charging for indefinite runtime while plugged in
Power Source	Li-Ion Battery with USB-C PD
Connectivity
Size	Ultra-compact pocket size, 80-100mm fan
Environment	indoor
Difficulty	Intermediate
Est. Time	3-5 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

Portable Solder Fume Extractor ★

Key IC selection

main controller

• Need: Wi-Fi/BLE enabled MCU with sufficient GPIOs for ADC (potentiometer), PWM outputs (fan and LED), and button inputs.
• Class: 32-bit Wi-Fi + BLE Microcontroller Module
• Shortlist: Espressif ESP32-WROOM-32, Espressif ESP32-C3-MINI-1
• Pick: Select based on stock availability, required peripheral count, and physical dimensions on the PCB.

USB-C Power and Pass-Through Charging Management

• Need: Support USB PD/BC1.2 input, dynamic power path management (DPPM) for simultaneous system load powering and battery charging.
• Class: Switch-mode Li-ion Battery Charger with Power Path
• Shortlist: TI BQ25713, Analog Devices LTC4162-L
• Pick: Choose based on input voltage range (5V to 20V USB-C), battery cell count (1S or 2S), and charging current requirements.

Fan Motor Speed Controller

• Need: Low-side N-channel MOSFET or integrated fan driver supporting PWM speed control for the DC blower fan.
• Class: Logic-Level Power MOSFET or BLDC Motor Driver
• Shortlist: Nexperia PMF37UN, TI DRV8837C (if brushed) / Simple Gate Driver + MOSFET (if brushless)
• Pick: Select based on fan operating voltage, stall current, and thermal dissipation on the board.

Risk register

ID	Area	Severity	Detail	Mitigation
r1	thermal	high	Pass-through charging combined with simultaneous high-speed fan operation and high LED brightness in a compact, enclosed portable housing can cause excessive heat buildup around the battery pack.	Implement thermal foldback in firmware for charging current and fan/LED limits if internal NTC thermistor exceeds safe thresholds.
r2	power	med	Inrush current spikes when starting the blower fan motor at high speeds can cause voltage sags on the 5V/battery rail, potentially resetting the ESP32-WROOM-32.	Ensure adequate bulk capacitance on the system power rail and implement a soft-start PWM ramp for the motor driver.
r3	emi	med	PWM switching noise from the high-current fan motor and LED strip can couple into the ESP32 RF antenna or ADC input lines for the potentiometer, causing erratic speed jumps.	Route analog and RF traces away from high-current motor/LED traces, use proper ground plane partitioning, and add RC filtering on potentiometer ADC pins.

Key Components

2/2 modules matched to real parts. See the BOM tab for the full component table.

USB-C Power Jack (USB4151-GF-C)

The candidate's MPN (USB4151-GF-C) matches the primary MPN exactly.

ESP32-WROOM-32 (ESP32-WROOM-32)

Candidate 1 (ESP32-WROOM-32) is an exact match for the primary MPN and preferred manufacturer Espressif.

Build Summary

• Difficulty: Intermediate
• Estimated time: 3-5 hours
• Tools required: Soldering Iron, Hot Air Rework Station, Multimeter, USB-C Power Meter, Wire Strippers, PC for Programming

See the Build tab for the full step-by-step assembly guide.

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Generated by YuanQi AI Design System · Query: Small portable solder fume extractor with rechargeable battery and USB-C charging.