Rješenje za temperaturu kontrolu problem konstantu temperaturu električno lemljenje glačalo
The konstanta temperatura lemljenje glačalo usvaja a visoka Curie temperatura traka PTC konstanta temperatura grijanje element element iznutra, opremljena sa a pričvršćivanjem toplinska provodljiva struktura. The karakteristike su superiorni to tradicionalni električni grijanje žica lemljenje glačalo jezgre, s brzo grijanje, energija ušteda, pouzdano rad/2c duga servis život, i niska cijena. Niska napon PTC grijanje elementi može biti korištena u polju za lako održavanje rad.
The common malfunction of a constant temperature soldering iron is temperature runaway, which results in the soldering iron's temperature being too high. On the one hand, it leads to high-temperature oxidation of the soldering iron tip (the solder is also oxidized at the same time); On the other hand, welding at high temperatures can also easily burn out electronic components. When the soldering iron works at high temperatures for a long time, it is also easy to cause damage to its internal circuit, resulting in permanent loss of control or even inability to use. During the fault inspection, it will be found that the sliding contact of the temperature regulating resistor R2 (Figure 1) is oxidized, resulting in poor contact. This is equivalent to the temperature being adjusted to the maximum upper limit, causing the temperature of the soldering iron to be higher. There are two fundamental reasons for this: firstly, when the soldering iron is working, it transfers some heat to the handle of the soldering iron (inside the circuit), causing the temperature of the working environment of the circuit to increase. After a period of time, it is easy to cause oxidation of R2's moving contacts; The second issue is that the current limiting resistor R1 (Figure 2) in the rectification and filtering circuit dissipates heat, causing an increase in the working environment temperature and easily leading to the oxidation of R2's moving contacts.
Za spriječiti takve kvarove od pojavljivanja, sljedeće dvije metode modificiranja kruga su predloženi za referencu.
(1) Zamijenite podesivo otpornik R2 sa a fiksnim otpornikom: Prvo podesite R2 do dosegnite optimalno temperaturu točku za normalno upotrebu lemljenje glačalo, zatim mjerite vrijednost od R2 i zamijenite to s a fiksnim otpornikom.
(2) Zamijeni R1 sa C (C ≈ 0.12 μ F) i poveži a dioda D1 u paralelno
