Can the cooling purpose be achieved by a series of diodes connected to an electric soldering iron?
The DC power supply directly supplies power to the soldering iron. Due to the lack of temperature detection and control circuits, the temperature cannot be kept constant and will vary with the welding area. Low temperature may cause slow soldering speed, while high temperature may cause the soldering iron tip to oxidize too quickly, resulting in failure to solder. The ideal way to solve the problem of constant temperature is to add temperature detection and control circuits. If a regular electric soldering iron is used for modification, as the soldering iron itself does not have a temperature detection component, it cannot be changed to temperature control and can only be cooled by reducing pressure.
Ordinary diodes, depending on the model, have a forward voltage drop of around 0.7V for ordinary rectifier diodes, while Schottky diodes have a lower forward voltage drop. If the soldering iron is powered by AC power at power frequency, series diodes can have a voltage reduction effect, because the effective voltage value of the AC power will be halved after half wave rectification by the diodes
To significantly reduce the temperature, the only way is by significantly lowering the voltage. There are two ways to reduce voltage. One is to change the reference voltage of the sampling part of the internal output terminal voltage of the charger. This change method requires certain circuit experience and foundation. Another method is to use a finished DC adjustable step-down module and change the output voltage through a variable resistor. And it can be modified with automatic cooling, and detection components can be added to the soldering iron holder. After the soldering iron is placed, the voltage will automatically decrease.
Why doesn't the soldering iron stick solder
1. The electric soldering iron has been used for a long time, and the internal heating core is aging or damaged, emitting heat that cannot reach the melting point of the solder, resulting in the soldering iron head not sticking to the solder.
2. During daily use, the electric soldering iron is not tinned after use, resulting in oxidation of the soldering iron head with air at high temperatures.
3. After using the soldering iron, the power was not cut off in a timely manner. The soldering iron is in a high temperature state for a long time, which oxidizes with air, resulting in non stick soldering.
4. For the sake of convenience in daily welding, acidic flux is used, which oxidizes the soldering iron tip at high temperatures.
5. The problem with the soldering iron head itself is that some materials with poor quality are used, such as some soldering iron heads that are directly made of iron, which are prone to oxidation.
