Is it common for AC voltage to show up on the soldering station's cutter head?
If it is measured by an induction pen, this is normal, because the accuracy of the induction pen is not too high.
The difference between soldering station and ordinary electric soldering iron
Ordinary electric soldering irons are generally divided into internal heating type and external heating type. The main difference between these two types of soldering irons is the location of the heating core and tip. The heating core of the internal heating type electric soldering iron is in the middle of a metal sleeve, and the soldering iron tip is set on the heating core; while the external heating type is to wind the heating wire outside the metal sleeve, and the soldering iron tip is a solid metal rod.
In addition to the difference in structure, the internal heating electric soldering iron and the external heating electric soldering iron also have some differences in the use parameters. The internal heating type electric soldering iron has a relatively short warm-up time, and can heat up relatively quickly when the power is turned on, while the external heating type has a relatively slow heating speed. The internal heating type is generally an electric soldering iron with relatively small power, and the high power one is generally an external heating type. Another difference is that because the internal heating type soldering iron tip is set on the heating core, it is easier to oxidize. The service life is short; while the external heating type soldering iron tip has a relatively long service life because of its solid structure.
Whether it is an internal heating type electric soldering iron or an external heating type electric soldering iron, what they have in common is that they directly use 220V AC. The problem brought about by this is that a part of the leakage current will be generated at the position of the soldering iron tip, which may cause damage to components or circuits that are sensitive to static electricity; Smaller electric soldering irons have low heating temperature and slow temperature recovery, which is suitable for welding small solder joints. It is not easy to melt tin when soldering large solder joints. If you use a high-power electric soldering iron to solder small solder joints, it is easy to cause the temperature to be too high damage. Therefore, it is difficult for a soldering iron to solve the problem of power adaptation. Although there are some electric soldering irons that can adjust the temperature, its temperature control accuracy is not too high.
The soldering station is also a kind of electric soldering iron. The biggest difference between it and the ordinary electric soldering iron in appearance is that in addition to the welding handle, there is an extra thing like a power supply. This thing is actually a transformer, and it adds a temperature control circuit. Most of the welding handles of the soldering station use an internal heating heating core. The difference between it and the heating core of an ordinary electric soldering iron is that in addition to the heating resistance wire, a temperature detection element (usually a thermoelectric heating element) is added inside it. Even), so that the temperature of the heating core can be detected in real time and fed back to the temperature control circuit for temperature control. Some soldering stations also use digital display to display and adjust the temperature, which is more intuitive to use.
The power supply of the soldering iron core of the soldering station is not directly using 220V, but after stepping down the voltage of the transformer, the power supply voltage is about 20V-30V. In this way, the step-down and isolation of the transformer are added, which can effectively avoid the influence of leakage on components and circuits.
The relatively simple temperature control circuit of the soldering station is generally realized by using an op amp to control the thyristor. The structure of this circuit is relatively simple, and the cost is relatively low, but there is no real-time temperature display; there are also those that use single-chip microcomputer control to display the temperature in real time through digital tubes.
Is it normal for AC voltage to appear on the cutter head of the soldering station?
Due to the isolation of the transformer in the soldering station, under normal circumstances, there will be little leakage. However, because the driving heating core is AC voltage, it may be displayed if measured with an induction pen. The power supply of the soldering station is generally powered by a three-phase plug, and the ground terminal is also drawn around the heating core. If you find a leakage problem, you should check whether the socket is well grounded.
