Solder in series with diode can provide cooling
DC power supply directly to the soldering iron power supply, because there is no increase in the temperature detection and control circuit, the temperature can not be constant, will follow the soldering area and change. Too low a temperature may cause slow tin, too high a temperature will cause the tip of the iron to oxidise too quickly causing no tin. The ideal way to solve the problem of constant temperature is to increase the temperature detection and control circuit. If the use of ordinary soldering iron for modification, due to the iron itself does not have a temperature detection element, can not be changed to temperature control, can only be through the way to reduce the voltage to lower the temperature.
Ordinary diodes, depending on the model, ordinary rectifier diodes, forward voltage drop is generally about 0.7V, Schottky diode forward voltage drop is also low. If the soldering iron power supply is used for industrial AC power, series diodes can play a role in voltage reduction, because the AC power through the diode half-wave rectifier, the voltage RMS value will be halved. But for DC voltage, the ideal voltage drop of the diode is only 0.7V at maximum, the voltage reduction is too small, and there is no obvious effect on the temperature reduction.
The only way to significantly reduce the temperature is by significantly reducing the voltage. There are two ways to reduce the voltage, one is achieved by changing the reference voltage of the voltage sampling part of the charger's internal output, this change requires a certain amount of circuit experience and foundation. Another way is to use the finished DC adjustable buck module to change the output voltage by variable resistor. And can be modified to automatically lower the temperature, you can increase the detection components in the iron stand, the iron into the automatic voltage reduction.
