Can cooling be achieved by using a soldering iron to connect a diode in series?
The purpose of connecting diodes in series is to reduce the voltage and solve the problem of excessive temperature of the soldering iron. Let's analyze whether the purpose of cooling can be achieved after connecting diodes in series.
The DC power supply directly supplies power to the soldering iron. Since there is no temperature detection and control circuit added, the temperature cannot be kept constant and will change with the welding area. If the temperature is too low, the tin melting speed may be slow, and if the temperature is too high, the soldering iron tip may oxidize too quickly and the soldering iron tip may not be tinned. To solve the problem of constant temperature, the ideal way is to add a temperature detection and control circuit. If the ordinary electric soldering iron used is modified, since the soldering iron itself does not have a temperature detection component, it cannot be changed to temperature control and can only be cooled down by reducing the voltage.
Ordinary diodes, depending on the model, the forward voltage drop of ordinary rectifier diodes is generally around 0.7V, and the forward voltage drop of Schottky diodes is even lower. If the soldering iron is powered by industrial frequency alternating current, a series diode can reduce the voltage, because after the alternating current is half-wave rectified by the diode, the effective voltage value will be halved. However, for DC voltage, the maximum ideal voltage drop of the diode is only 0.7V. The voltage drop is too small and has no obvious effect on reducing the temperature.
If you want to significantly reduce the temperature, you can only significantly reduce the voltage. There are two ways to reduce voltage. One is to change the reference voltage of the voltage sampling part of the internal output terminal of the charger. This change method requires certain circuit experience and foundation. Another method is to use a finished DC adjustable buck module to change the output voltage through a variable resistor. And it can be modified to automatically cool down. You can add detection components to the soldering iron stand, and the voltage will be automatically lowered after the soldering iron is put in.
Therefore, by using series diodes to cool down, the final effect is not ideal because the voltage reduction amplitude is too small.
