Løsning til temperatur løbsk af konstant temperatur elektrisk lodning jern
Det indvendig af konstant temperatur elektrisk lodning jern vedtager a høj Curie temperatur strimmel formet PTC konstant temperatur opvarmning element, udstyret med a fastgørelse termisk ledningsevne struktur. Det karakteristisk er er overlegen til traditionel el ledning lodning jern kerner, fast opvarmning, energi besparelse, pålidelig drift, lang service levetid, og lav omkostning. Lav spænding PTC varme kerner kan bruges i feltet, gør det let til vedligeholdelse arbejde.
Løsning til temperatur løbsk af konstant temperatur el lodning jern
The common malfunction of a constant temperature electric soldering iron is temperature runaway, which results in the temperature of the soldering iron being too high. On the one hand, it leads to high-temperature oxidation of the soldering iron head (soldering tin is also oxidized at the same time); On the other hand, welding at high temperatures can also easily burn out electronic components. When an electric soldering iron works at high temperatures for a long time, it is also easy to cause damage to its internal circuit, causing permanent loss of control and even inability to use. During fault inspection, it will be found that the sliding contact of the temperature regulating resistor R2 is oxidized and causes poor contact, which is equivalent to the temperature being adjusted to the maximum upper limit, resulting in a high temperature of the soldering iron. There are two fundamental reasons for this: firstly, when the electric soldering iron is working, it transfers a portion of 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 is that the current limiting resistor R1 in the rectification and filtering circuit dissipates heat, causing an increase in the working environment temperature of the circuit and easily causing oxidation of the R2 moving contact.
For at forhindre forekomsten af sådanne fejl% 2c følgende to metoder til ændring kredsløbet er foreslået
(1) Udskift justerbar modstand R2 med a fast modstand% 3a Første% 2c juster R2 til nå den optimale temperatur punkt for normal brug af lodning jern % % derefter mål værdien af R2 og udskift den med en fast / modstand.
(2) transformering den ensretter kredsløb: kredsløbet strukturen er vist i den følgende figur.
