TEC 温控模块设计

flux

已继续完成PCB：70×90mm 2层板、元件布局、自动布线、关键DRC检查清空，并补齐通用阻容MPN后导出了制造文件。下单前建议用Gerber查看器快速确认DC圆孔座脚位/孔位和端子方向。
制造文件：
开放项：
  • 外接TEC/风扇和NTC探头不在板上，需要按12V、总电流≤约5A购买。
  • 第一次上电请按Board Bring-Up Plan限流测试。
建议下一步：
  1. 上传Gerber到JLCPCB/PCBWay预览。
  2. 核对BOM和贴片方向。
  3. 买12V 5A电源、12V TEC+风扇套件、10k B3950 NTC探头。
  4. 板到手后按测试计划逐步上电。
ka000

ka000

1、dc圆孔输入头方向不正确，被部分元器件阻挡，请旋转。2、板材面积太大了，请缩小到合适体积。

flux

我会调整PCB：先检查当前布局尺寸和DC座位置，再缩小板框并重新放置/旋转输入区域，确保DC圆孔不被遮挡。

flux

当前无法继续执行修改：你的账户当前没有可用 ACUs，AI执行功能暂时不可用。
本次已开始处理你的新要求：
  • 已确认要调整两项：旋转/重新放置DC圆孔输入座、缩小PCB板框。
  • 已建立待办计划，但还没能实际读取/修改PCB布局。
剩余工作：
  • 检查当前DC圆孔座的方向和被遮挡位置。
  • 将板框从当前约70×90mm缩小到更合适尺寸。
  • 旋转并移动DC输入座，重新安排F1、D1、C1等输入保护元件。
  • 重新布线/修正空气线。
  • 重新跑DRC，确认无关键错误。
检查DC座间距
设定板框尺寸
优化输入区域
手动修改步骤
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R5
Resistance
47kΩ
C1
Capacitance
470uF
R2
Resistance
100kΩ
R6
Resistance
100kΩ
C3
Capacitance
100nF
C2
Capacitance
100nF
RT1
Resistance
10kΩ
R4
Resistance
680kΩ
R7
Resistance
100Ω
R3
Resistance
56kΩ
R8
Resistance
2.2kΩ
R1
Resistance
10kΩ
J1
D2
F1
Q1
J2
J3
D3
U1
J4
D1

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Project Specification
Project Overview
Status: Draft schematic in progress.
This project is a 12V analog temperature-controlled TEC phone cooler controller. It switches a thermoelectric cooler (TEC) and fan at full power when a thermistor attached to a phone back/edge exceeds about 40°C, without any MCU or firmware.
Intended Use
  • Prototype module for intermittent outdoor phone cooling.
  • Intended load: external 12V TEC cooling assembly and 12V fan.
  • Normal power source: external 12V DC barrel-jack adapter, recommended 12V 5A.
  • User is a beginner builder, so the design avoids programming and USB interfaces.
What the Device Should Do
  • Sense phone surface temperature using an external 10k NTC B3950 probe.
  • Turn TEC and fan fully ON when temperature rises above about 40°C.
  • Turn TEC and fan OFF after cooling below the hysteresis point, calculated near 35.3°C with the initial resistor values.
  • Fail safe for open thermistor: TEC remains OFF.
  • Provide visual status LED when cooling output is active.
Main Features
  • 12V DC input through 5.5mm/2.1mm barrel jack.
  • Input overcurrent and transient protection.
  • LM393-class analog comparator; no MCU and no firmware.
  • Low-side logic-level MOSFET switching for TEC and fan outputs.
  • Separate screw terminals for TEC and fan.
  • JST-XH 2-pin connector for external NTC probe.
System Architecture
Diagram



  
    
  
  
    
  



















12V DC adapter
Input protection
12V protected rail
TEC output terminal
Fan output terminal
Low-side N-MOSFET
10k NTC probe
LM393 comparator with hysteresis
Ground
Hardware Subsystems
  • Power input: DC-005 barrel jack, 12V nominal, target 5A adapter.
  • Protection: 5A resettable fuse and SMAJ13CA TVS on protected 12V rail.
  • Sensor: external 10k B3950 NTC; open sensor drives sense node high and keeps output off.
  • Comparator: LM393 powered from 12V; reference divider sets approximately 40°C trip with hysteresis.
  • Comparator threshold values: with R1=10k pull-up, external RT1=10k B3950 NTC, R2=100k, R3=56k, and R4=680k hysteresis, the calculated turn-on threshold is about 40.6°C and turn-off threshold is about 35.3°C.
  • Output switch: low-RDS(on) N-channel MOSFET for TEC and fan low-side return.
  • Fan transient protection: Schottky diode across switched load rail.
Interfaces and Connections

Table

InterfaceConnectorNotes
12V input5.5/2.1mm DC barrel jackCenter-positive assumed
TEC output2-pin screw terminal12V+ and switched negative
Fan output2-pin screw terminal12V+ and switched negative
NTC sensor2-pin JST-XHExternal 10k B3950 probe
Power and Runtime Expectations
  • Recommended adapter: 12V 5A.
  • Target maximum board-switched load: up to about 5A combined TEC + fan.
  • Comparator/control current is negligible relative to TEC load.
  • TEC can run at 100% duty if the external TEC module, fan, adapter, wiring, MOSFET copper, and heatsink are sized for continuous current.
Power Tree and Power Budget

Table

RailLoadTypicalPeak / Design
12V protectedTEC moduleTBD by purchased module4.5A target max
12V protectedFan0.1-0.3A typical0.5A design
12V protectedComparator + dividers + LED40°C full-power cooling.

  • Project Overview

  • Intended Use

  • What the Device Should Do

  • Main Features

  • System Architecture

  • Hardware Subsystems

  • Interfaces and Connections

  • Power and Runtime Expectations

  • Power Tree and Power Budget

  • Manufacturing and Assembly Expectations

  • Firmware-Relevant Hardware Requirements

  • Physical Design Expectations

  • Important Design Decisions

  • Assumptions

  • Change Notes

12V TEC Phone Cooler 29d1

12V TEC Phone Cooler 29d1 thumbnail
12V analog temperature-controlled TEC phone cooler: NTC sensor switches a TEC and fan at about 40°C using a comparator, with DC input protection and no MCU/firmware.

Properties

Properties describe core aspects of the project.

Pricing & Availability

Distributor

Qty 1

Arrow

$1.02–$2.39

Digi-Key

$0.46

HQonline

$0.16–$0.36

LCSC

$3.17–$3.50

Mouser

$5.88–$6.20

TME

$1.12–$1.14

Verical

$0.47–$68.02

Controls