For home appliance maintenance personnel and electronic enthusiasts, iron iron is one of the necessary welding tools in maintenance work. Its advantages and disadvantages and quality directly affect the efficiency of maintenance work. we know. In daily maintenance work, the iron iron is often in a long time, because overheating is severely oxidized by the soldering iron. Including the tip of the soldering iron makes the welding difficult, and it also reduces work efficiency. Once the tip is severely oxidized. No matter what you use any way, it is difficult to make it up, although the newspaper has introduced various countermeasures, it is actually completely solved. Sometimes it is temporarily solved. But after the sale of iron is still as oxidation. Take information for this author. I hope to find a way to extend the life of the soldering iron. First, the author attempts according to the newspaper introduction, that is, install a diode and switch on the power supply of the soldering iron. The circuit is shown in Figure 1. When the iron iron is turned on, the switch is in a normally open position. Since the connection of the diode is maintained in the half-wave rectification state, the power is about half of the usual, and the power-on power does not cause the iron head. Overheal oxidation. As long as you work, just press the switch. The soldering iron works rated power, and its temperature will rapidly facilitate welding. The disadvantage is that you should press the switch every time you work, so it is always easy to use, and if the circuit changes the circuit to Figure 2, it is slightly better.
The circuit of Fig. 2 is only used in a normal switch with a temperature switch, and the temperature switch is fixed on a thin aluminum plate, and as long as the soldering iron of the soldering iron is placed on a thin aluminum plate, once the temperature reaches 100 ° C, the temperature switch will be disconnected. At this time, only the diode is powered, and the soldering iron works in half wave state. Reduce the power of the soldering iron to prevent the soldering iron head from the soldering iron. Also indirectly extend the life of the soldering iron. Don't use the switch when you work.
Although the life of the electric iron after modification can be extended, the disadvantage is not to be quickly soldered, so that it cannot be accepted by the majority of home appliance repair personnel and electronic enthusiasts. Can you find a better solution? The author first analyzes the working principle of constant temperature soldering iron. The working principle is probably similar to the above example. After arriving at the set temperature, the electric soldering iron turns off the power supply, once the temperature is lowered and connected The power supply keeps the set temperature. Just like the regulator. Can you solve this problem with a way to use a voltage? First, I first think of the electronic pressure regulator, experiment, and use the electronic pressure regulator to adjust the electric soldering iron. The effect is really better, and the application is shown in Figure 3. The electronic pressure regulator circuit is shown in Figure 4.
It is necessary to determine a welding critical point when using it for the first time, and this welding critical point means that the temperature of the iron can be melted to melt solder. First turn the voltage low and slowly adjust the voltage. When the soldering iron is just melting the solder wire, it makes a mark on the electronic governor panel, and then as long as it is adjusted to the place. It can be welded directly. More convenient. If the temperature is too low, it is adjusted to the right (some solder melting point is relatively high), and the voltage is high: this will work properly. When the welding is good, remember to return the knob to the welding neoplant mark. The soldering iron after modification of this method is tested, and the soldering iron head of the told iron is not overterated, basically in the same way as the thermostat iron. More gratifying is to be welded at any time. Don't wait slowly, don't worry that the soldering iron head will affect the welding work for a long time energization. The disadvantage is that there is no way to show the temperature, the advantage is that the temperature is simple, the cost is relatively low; in order to more intuitive adjustment voltage. Add a small voltmeter on the original basis. Make this simple warranty iron iron more convenient adjustment, the circuit is shown in Figure 5.
In this way, it is more convenient to use, and only the appropriate voltage is about 165V to be welded to the component, this temperature is about 210 ° C (the soldering iron is 30 watts), and this voltage is also set to a critical welding point. After practical, it is a great shortage of electric soldering iron life. It is a simple and practical warranty (pressure regulating) soldering iron, interested e-enthusiasts do not prevent it.
Author: Luo Caizhi
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