Analiza Nadzor Princip Od Krmiljenje Krmiljenje Vezje T12 Bela Fotoelektrika Spajkanje Železo
T12 bela fotoelektrična spajkanje železo, ogrevanje žica znotraj the spajkanje železo glava is povezana v serija z termočlenom, in dva zatiči so ne ne samo vhodna linija od moč napajanje, ampak tudi izhodna linija of termoelement signal. The vezje shema diagram of splošno krmiljenje vezje is na splošno kot na splošno kot sledi:
The working proces of the circuit is as sledi:
①V the vezje, pin 2 of the operativni ojačevalnik LM358 prednastavitve signal napetost vrednost (mV raven) of termoelement at at the set temperatura. Kdaj vezje napajano vklopljeno, the napetost zatič 3 OF LM358 is ni to to to pin 2c in the izhod of the operativni ojačevalnik terminal 1 pin izhodi nizka raven, dioda T4 sponke pin 6 drugo operativno ojačevalno to nizko nizko raven, in njegov izhod terminal 7 pin izhodi visok raven raven. To visoka raven is preneseno do do trioda 2N5551 sko the upor 103, the trioda volja be nasičena, in njegov zbiralnik potencial volja volja zmanjšanje. The G pole of the dva MOS tranzistorji TPC8107 povezani do C pole oda is spuščeni do vklop MOS cev, in the power supply starts to napajanje do napajanje do T12 sko sko the D pole do the S pole.
② When the power supply is powered by T12, the power supply voltage charges the capacitor C103 through the resistance of 103, which can make the level of pin 3 of the op amp higher than that of pin 2 in a short time, and pin 1 of the op amp is flipped to a high level.
③T4 izolati the visoka raven pin 1, in pin 6 počasi polni the kondenzator 104 skozi upor 205, in kdaj zakasnitev is zakasnitev do potencial PIN 6 OF OP AMP IS višji kot to PIN 5, pin 7 of OP amp izhodi nizka raven, in The Triode IS CUT off, TPC8107 Tudi cut off, stop Supplying power to T12.
④Once the TPC8107 is turned off, stop supplying power to T12. Then the 3-pin voltage of LM358 will quickly become low level. But this low level is actually equal to the signal voltage of the thermocouple transmitted from the thermocouple inside T12 through the resistance of 103. If the signal voltage of the thermocouple is still lower than the preset op amp pin 2 level at this time, the circuit state will repeat the process of ①, and carry out the cycle of ①—②——③—④. If the signal voltage of the thermocouple is higher than the preset pin 2 level of the op amp, it means that the temperature of the soldering iron tip has reached the preset value, the LM358 will not flip, and the circuit will not supply power to T12. This power failure process has been waiting for the level of pin 3 of the op amp to drop below the preset value of pin 2 again, and then start to turn over to supply power to T12 again. Warm up the soldering iron tip. This action maintains the constant temperature of the T12 soldering iron tip.
All in all, the control circuit supply power to T12 in a pulz state, and the pulz width odvisno od the hitrost at kdaj the upor 205 on pin 5 of the op amp charges the kondenzator 104. The pulz interval is zelo majhen, odvisno od hitrosti at kdaj the polnjenje 103 kondenzator on the 3 pin of the OP OP IS IZPRAZNJENO SKOZI UPOR 103 in Nato skozi the ogrevanje žica žica T12. Med impulz interval, the vezje dejansko zazna signal signal of termočlen to do določite ali the impulz moč napajanje bi morala nadaljevati, so as to realize the konstantna temperatura of spajkanje železo konica.
