Can a series of diodes connected to an electric soldering iron achieve the purpose of cooling down
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. However, for DC voltage, the ideal maximum voltage drop for diodes is only 0.7V, and the magnitude of voltage reduction is too small, which has no significant effect on temperature reduction.
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.
