Constant temperature electric soldering iron heating circuit

Abstract

The invention discloses a constant temperature electric soldering iron heating circuit which comprises a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, a first diode, a second diode, a third diode, a fourth diode, double-direction controllable silicon, a first capacitor, a second capacitor, a first adjustable resistor, a second adjustable resistor, a first comparator, a second comparator, a thermocouple and a thermal resistance wire. The constant temperature electric soldering iron heating circuit is simple in structure and low in cost while guaranteeing constant temperature accurately in real time.

Description

technical field [0001] The invention discloses a heating circuit of a constant temperature electric soldering iron, which relates to the technical field of power electronics. Background technique [0002] There are two kinds of constant temperature electric soldering irons on the market, with temperature display and without temperature display. The Japanese white light 936 type or imitation Japanese white light 936 type without temperature display is the most common. The advantage of this kind of constant temperature electric soldering iron is that the circuit is simple, does not use a single chip microcomputer, does not need software control, and is low in cost; the disadvantage is that it can only be adjusted by the temperature adjustment knob. Indicates the approximate temperature, and the user cannot accurately know the temperature of the soldering iron in real time. The one with temperature display is basically controlled by single-chip microcomputer. The principle of ...

AI Technical Summary

Problems solved by technology

The Japanese white light 936 type or imitation Japanese white light 936 type without temperature display is the most common. The advantage of this kind of constant temperature electric soldering iron is that the circuit is simple, does not use a single chip microcomputer, does not need software control, and is low in cost; the disadvantage is that it can only be adjusted by the temperature adjustment knob. Indicates the approximate temperature, the user cannot accurately know the temperature of the soldering iron in real time

The one with temperature display is basically controlled by single-chip microcomputer. The principle of temperature display is: the thermistor inside the heating core of the electric soldering iron transmits the temperature of the soldering iron tip to the single-chip microcomputer. Therefore, its circuit includes two parts of software and hardware, the circuit is complicated and the cost is high

[0003] It can be seen from this that among the constant temperature electric soldering irons of the prior art, those with simple circuits and low cost cannot accurately display the temperature, while those that can accurately display the temperature are complex and costly.

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