Can a diode connected in series with a soldering iron achieve the purpose of cooling?
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 soldering area. Low temperature may cause slow tinning 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 soldering iron is used for modification, due to the lack of temperature detection components, it cannot be changed to temperature control and can only be cooled by reducing the pressure.
Ordinary diodes, depending on the model, have a forward voltage drop of around 0.7V for ordinary rectifier diodes, and even lower for Schottky diodes. If the soldering iron is powered by AC power, a series diode can be used to reduce the voltage, because the effective value of the voltage will be halved after the AC power is half rectified by the diode. However, for DC voltage, the ideal voltage drop of a diode is only 0.7V, and the amplitude of voltage reduction is too small, which has no significant effect on temperature reduction.
To significantly reduce the temperature, the only way is to significantly lower the voltage. There are two ways to reduce voltage, one is to change the reference voltage of the internal output voltage sampling part of the charger, which requires certain circuit experience and foundation. Another method is to use the finished DC adjustable voltage reduction module to change the output voltage through a variable resistor. And it can be modified with automatic cooling, adding detection components to the soldering iron holder, and automatically lowering the voltage after the soldering iron is placed in.
