High-power PTC heating station (simple reflow soldering station)

## Introducing

the homemade high-power PTC heater, using thyristor control scheme, size 200 * 100.

The heating plate control scheme uses thyristor to control strong electricity.

The temperature measurement part uses K-type thermocouple + MAX6675.

![Circuit board]
The heating plate is a high-power PTC heating plate, and the outer casing is made of fiberglass cloth, which is the same material as the PCB. See the attachment for the drawing.

![Top]
![Front]
![Back]
![Thermocouple]
![At work]
## Notes

**Say the important things in advance**
**Say the important things in advance**
**Say the important things in advance**

- This project involves strong current control, so be very careful and ensure that the leakage protector is normal during debugging
- Do not look at the BOM list for components, read the project introduction first, and then the schematic diagram
- There are some problems with the current zero-crossing detection + chopper circuit control scheme , the heating plate will buzz, do not solder the zero-crossing detection circuit part
- the current control scheme is interval heating, the optocoupler `EL3053` in the schematic diagram is recommended to be replaced with `EL3063`
- the thyristor model uses `BTA16-600 `, can be replaced with `BTA12-600`, be sure to add heat dissipation
- the ESP32S2 used in the project is too wasteful, DIY it is recommended to replace it with ESP32C3
- except for the above instructions, please do not replace the components in the project at will, be sure to pay attention to the components The power and voltage resistance value
- in the temperature measurement part, the thermocouple is drilled and tapped to be fixed on the heating plate. Do not use tape to fix it. The temperature measurement will not be accurate if the tape is attached. - The software part has not been completed yet. It only has the power adjustment function for now. The ## demonstration
of temperature control related functions will be improved in the future [https://www.bilibili.com/video/BV1we4y127a8/](https://www.bilibili.com /video/BV1we4y127a8/)