Temperature Control Analysis of Electric Soldering Iron
(1) The temperature control circuit is a circuit made by using its temperature detection function, which can be composed of power supply part, temperature detection element, signal amplification, proportional integral, voltage comparison, phase shift trigger control relay, over temperature protection, LED display and other parts.
(2) Thermistors can be used for temperature detection, display and control of various equipment or environments by using their linear characteristics of temperature changes, and can be used for protection of circuits or equipment by using their surge characteristics at a certain temperature and call the police. When the temperature detection element detects a temperature value signal, the signal is amplified and compared to control the heating power of the heating device to achieve the purpose of temperature control. The temperature compensation circuit reduces the influence of room temperature on the accuracy of temperature measurement; the over-temperature protection circuit can ensure that when the heating temperature exceeds the set value, the device stops heating to protect the equipment.
(3) The simple constant temperature electric soldering iron sold on the market, its constant temperature control part is directly powered by the mains to drive the circuit of the triac. Scattered structure, unfavorable operation.
(4) The temperature control range of the workbench should be set between 100°C and 400°C, and it can be adjusted for welding different materials.
On-off control analysis of electric soldering iron
(1) Utilize the characteristic that the resistance value of the photoresistor decreases rapidly under the irradiation of light of a specific wavelength. To control the on-off of the electric soldering iron when it leaves the soldering iron frame, to achieve the purpose of on-off control of the electric soldering iron.
(2) When the electric soldering iron leaves the soldering iron stand, in addition to the photosensitive control, a mechanical switch is used to control the power on and off.
The purpose is to completely isolate the soldering iron from the power supply.
