Thermostatic soldering iron circuit diagram
The simple constant temperature soldering iron sold in the market, the constant temperature control part is directly powered by the mains to drive the circuit of the two-way thyristor. Once the problem occurs, the components are burnt black or burst, and the color and mark of the damaged device cannot be recognized. Maintenance brings difficulties.
Here, we take the representative Guangzhou Huanghua Electronic Appliance Factory 905C constant temperature electric iron as an example to introduce the working principle of the constant temperature soldering iron.
The temperature range of the soldering iron is 100 ° C ~ 400 ° C, the temperature adjustment mark indicates low, medium and high position, the temperature control accuracy is nominally ± 5%, and a thermocouple sensor is used. The control circuit adopts the direct current step-down, filtering and regulated power supply scheme of the AC mains. The working principle is shown in the figure below.
The mains AC220V is used as the power supply voltage and temperature setting voltage source of the comparison device IC after R1 step-down, D1 half-wave rectification, D2 clipping regulation, and C1 filtering. The IC-A3 pin is the thermocouple detection voltage input terminal (corresponding to the temperature value); the 2 pin is the thermostat setting voltage. After the voltages at both ends of pins 2 and 3 are compared, they are output by pin 1. The role of R5 is to feed back a small part of the input to the non-inverting input pin 3, so that the output lock does not change when the small signal fluctuates. When the thermocouple detects that the temperature is low; the level of the 3 pin is lower than the 2 pin, so that the output pin 1 is also low. Further, the IC-B amplifier 6 pin is lowered relative to the fixed bias 5 pin, so that the output 7 pin is high. Since the voltage of the IC-B5 pin is obtained by dividing the AC220V by R6 and R7, the frequency and phase are completely the same as those of the AC220V. After comparing with 6-pin DC, the AC voltage is output at 7 feet. The AC voltage is reversely connected in parallel with C2, D4, D3 and D4 (acting as a bidirectional diode) to trigger the bidirectional thyristor, so that the corresponding voltage is applied to the soldering iron heating wire to achieve the purpose of constant temperature.
·Basic precautions
Do not put expensive oil into low-quality cartridges to avoid wastage. Most pre-filled oil cartridges have the so-called 510 thread. The oil cartridge screws onto a rechargeable battery. Some of these batteries have buttons and some heat up automatically when you pump the oil. Some batteries have multiple temperature settings and some heat up to a preset temperature; these features need to be known in advance.
·Cleaning notes
Use a suitable cleaning tool to clean them, such as activated charcoal or dried tea leaves in a used pipe to absorb the oil. It is important not to use alcohol or other boiling water to clean the pipe, and to wait until it has cooled down completely before cleaning. Otherwise, the hot stem will come into contact with the watery liquid and cause the mouthpiece tenon to loosen, thus shortening the life of the 510 cartridges.
This is what you should be aware of when using 510 cartridges. At the same time, when using 510 cartridges, there are still some vaping tips, for example, when using them, be careful not to suck too hard, will not produce smoke. When you inhale too hard, the smoke is sucked directly into your mouth and not atomized by the atomizer, so gently inhaling is more powerful and gives you a better vaping experience.
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