CN102784993A

CN102784993A - Automatic constant-temperature electric soldering iron

Info

Publication number: CN102784993A
Application number: CN2012103106672A
Authority: CN
Inventors: 周芸
Original assignee: Individual
Current assignee: Individual
Priority date: 2012-08-28
Filing date: 2012-08-28
Publication date: 2012-11-21

Abstract

The invention discloses an automatic constant-temperature electric soldering iron which is characterized in that a circuit of the automatic constant-temperature electric soldering iron consists of 220V alternating current, a capacitance resisting phase-shift circuit, a bidirectional thyristor control circuit and an electric soldering iron socket CZ. Various electric soldering irons on sale in market do not have fundamental improvement. Since an electric soldering iron during working is continuously switched on and heated in the waiting state most of the time and the real utilizing time is very limited, oxidizing burnout of a soldering head and burnout of a soldering core are due to overlong conduction time and overhigh temperature of the electric soldering iron. By the aid of the automatic constant-temperature electric soldering iron, the problem can be solved effectively since the temperature of the automatic constant-temperature electric soldering iron can be set as required and can be kept constant all the time, and burnout of the electric soldering iron due to overhigh temperature can be avoided. In addition, the circuit of the electric automatic constant-temperature electric soldering iron is simple and practical. The integrated automatic constant-temperature electric soldering iron is developed and formed by combining the control circuit with the electric soldering iron.

Description

The automatic constant-temperature electric iron

Technical field

The invention belongs to electronic technology and temperature control technology field, relate to a kind of automatic constant-temperature electric iron.

Background technology

For many years, the various electric iron of selling on the market never have any basic change.During repairing various electrical equipment, electronic equipment, need usually with instrument measurement circuit, analysis of failure, collating elements, electric iron must one leading directly to electricity and is preparing against use at any time during this period.Experience is told us: the most of the time during electric iron work is in continuous energising and adds hot standby state; The real time of using is very limited; The solder horn oxidation of electric iron is burnt to death in other words, the burning out because electric iron conduction time is long, the electric iron temperature is too high causes of iron core; In addition, the temperature of electric iron is too high not only burns solder horn easily to death, and the solder horn of burning to death is difficult for eating tin, and the render electrical flatiron is very not handy.

Automatic constant-temperature electric iron of the present invention can effectively address the above problem, it can adjust the operating temperature of setting electric iron as required, and remains the constant of electric iron temperature, accomplishes that to have stopped Yin Wendu too high and phenomenon that burn out electric iron takes place.The circuit of this automatic constant-temperature electric iron has succinct, practical, and its control circuit can be combined with electric iron, is developed to integrated automatic constant-temperature electric iron.

Below specify automatic constant-temperature electric iron of the present invention related relevant technologies content in implementation process.

Summary of the invention

Goal of the invention and beneficial effect: the various electric iron of selling on the market never have any basic change.Most of the time during electric iron work is in continuous energising and adds hot standby state; The real time of using is very limited; The solder horn oxidation of electric iron is burnt to death in other words, the burning out because electric iron conduction time is long, the electric iron temperature is too high causes of iron core; In addition, the temperature of electric iron is too high not only burns solder horn easily to death, and the solder horn of burning to death is difficult for eating tin, and the render electrical flatiron is very not handy.Automatic constant-temperature electric iron of the present invention can effectively address the above problem, it can adjust the operating temperature of setting electric iron as required, and remains the constant of electric iron temperature, accomplishes that to have stopped Yin Wendu too high and phenomenon that burn out electric iron takes place.The circuit of this automatic constant-temperature electric iron has succinct, practical, and its control circuit can be combined with electric iron, is developed to integrated automatic constant-temperature electric iron.

The circuit working principle: in the circuit of automatic constant-temperature electric iron, rc phase shifter circuit is made up of linear potentiometer RP, thermistor Rt, resistance R 1, capacitor C 1 and two-way triggering diode KS, and rc phase shifter circuit is being controlled the angle of flow of bidirectional triode thyristor SCR.When capacitor C 1 voltage when resistance R 1, quick resistance R t and linear potentiometer RP charging rise to two-way triggering diode KS conducting voltage, the bidirectional triode thyristor SCR conducting that is triggered.Along with the electric iron temperature rises; The resistance of thermistor Rt will constantly increase; Thereby prolonged the charging interval of capacitor C 1; Thereby change the angle of flow of bidirectional triode thyristor SCR when the positive and negative half cycle of 220V alternating current, the alternating voltage that makes electric iron obtain reduces, and at this moment the resistance of thermistor Rt will reduce along with the electric iron decrease of temperature; Along with the resistance of thermistor Rt reduces, the angle of flow of bidirectional triode thyristor SCR when the positive and negative half cycle of 220V alternating current will increase, and the alternating voltage that electric iron is obtained and then increases.So circulation makes the temperature of electric iron keep constant temperature.Linear potentiometer RP in the circuit is used to regulate the temperature constant value of setting electric iron.

Technical scheme: the automatic constant-temperature electric iron, it is made up of 220V alternating current, rc phase shifter circuit, control circuit of bidirectional thyristor and electric iron socket CZ, and its characteristic comprises:

Rc phase shifter circuit: form by linear potentiometer RP, thermistor Rt, resistance R 1, capacitor C 1 and two-way triggering diode KS; The control utmost point G of the termination bidirectional triode thyristor SCR of two-way triggering diode KS; One end of another termination capacitor C 1 of two-way triggering diode KS and an end of resistance R 1; Another termination 220V alternating current zero line side N of capacitor C 1; The other end of resistance R 1 is through an end and the lever arm thereof of thermistor Rt wiring property potentiometer RP, the first anode T1 of another termination bidirectional triode thyristor SCR of linear potentiometer RP;

The first anode T1 of bidirectional triode thyristor SCR in the control circuit of bidirectional thyristor connects the end of electric iron socket CZ, another termination 220V alternating current fire wire end L of electric iron socket CZ, and the second plate T2 of bidirectional triode thyristor SCR meets 220V alternating current zero line side N.

Description of drawings

Accompanying drawing 1 is the circuit working schematic diagram of an embodiment of automatic constant-temperature electric iron provided by the invention.

The specific embodiment

Specification requirement according to the components and parts of the circuit working schematic diagram of automatic constant-temperature electric iron shown in the accompanying drawing 1 and description of drawings and the following stated is implemented, and can realize the present invention.

The selection of components and parts and technical parameter thereof

KS is a bidirectional trigger diode, and the model of selecting for use is BCR3AM or 2CTS;

SCR is a bidirectional triode thyristor, and the model of selecting for use is 3CTSI or DB3;

Thermistor Rt resistance is 5.1K Ω, and thermistor Rt requires to use the thermistor of positive temperature coefficient;

It is the metalfilmresistor of 1W that resistance is selected RTX-1 type power for use, and the resistance of resistance R 1 is 5.1K Ω; The resistance of linear potentiometer RP is 22K Ω;

Capacitor C 1 is selected electric capacity of the dacron for use, and capacity is 0.1 μ F, require the withstand voltage >=200V of capacitor C 1;

CZ is the electric iron socket, and technical parameter is 1A/250V; The power bracket of electric iron is 20～50W.

Circuit production main points and circuit debugging

When making the circuit of automatic constant-temperature electric iron; As long as the electronic devices and components performance of selecting for use is intact; And the components and parts annexation in the accompanying drawing is welded to specifications, physical connection line and welding quality through scrutiny errorless after, but as long as circuit is debugging operate as normal just a little;

Constant temperature electric iron is exactly the temperature that will keep electric iron suitable, and key is that to choose positive temperature coefficient, change in resistance be several kilohms thermistor;

Thermistor Rt also can use the colour TV field-discharge resistance to make, and manufacturing process is: the PTC sheet in the colour TV field-discharge resistance is taken out, and with deep one ditch in its positive and negative corresponding section, firmly breaking off with the fingers and thumb is two with sharp cutter; Get wherein one, with the cuboid of on the grinding wheel PTC sheet being worn into 3mm * 7mm, two spring leafs in the colour TV field-discharge resistance are taken out again, and be organized into arc to increase elastic force, two flat springs are as the lead-in wire of thermistor; Select one section ￠ 8 * 12mm magnetic tube for use, two spring leafs are clamped cuboid PTC sheet and are tightly filled in, and behind two lead-in wires of burn-oning, seal magnetic tube two and exposed lead solder-joint with high temperature resistant AB glue at last, and thermistor Rt making work is at this moment accomplished;

Thermistor Rt is fixed on electric iron pipe metal shell appropriate location, changes the position of thermistor Rt on the electric iron metal shell, can change the design temperature of electric iron on a large scale; The circuit board of Thermal Control Element can be adhesive in the tail end of electric iron bakelite handle with AB, gets final product with the normal use that does not hinder electric iron;

When circuit debugging; At first should insert the electric iron of 20～50W at electric iron socket CZ; Linear adjustment potentiometer RP changes the alternating current voltage in the electric iron socket CZ between 120～218V; If the change in voltage interval is not right, can suitably adjust the resistance of resistance R 1 or the resistance of adjustment linear potentiometer RP;

Next is to use 200W alternating current pressure regulator; According to above-mentioned adjustment method; Working condition when observing the alternating current input voltage and being lower than 190V if technical parameter is quite different, can suitably be adjusted resistance R 1 or the parameter of capacitor C 1 in the rc phase shifter circuit; Also can be through the position of adjustment thermistor Rt on the electric iron metal shell, the temperature value that electric iron is set meets instructions for use.

Claims

1. automatic constant-temperature electric iron, it is made up of 220V alternating current, rc phase shifter circuit, control circuit of bidirectional thyristor and electric iron socket CZ, and its characteristic comprises:

Rc phase shifter circuit is made up of linear potentiometer RP, thermistor Rt, resistance R 1, capacitor C 1 and two-way triggering diode KS; The control utmost point G of the termination bidirectional triode thyristor SCR of two-way triggering diode KS; One end of another termination capacitor C 1 of two-way triggering diode KS and an end of resistance R 1; Another termination 220V alternating current zero line side N of capacitor C 1; The other end of resistance R 1 is through an end and the lever arm thereof of thermistor Rt wiring property potentiometer RP, the first anode T1 of another termination bidirectional triode thyristor SCR of linear potentiometer RP;