CN203236085U - Constant-temperature electric soldering iron - Google Patents
Constant-temperature electric soldering iron Download PDFInfo
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- CN203236085U CN203236085U CN 201320188855 CN201320188855U CN203236085U CN 203236085 U CN203236085 U CN 203236085U CN 201320188855 CN201320188855 CN 201320188855 CN 201320188855 U CN201320188855 U CN 201320188855U CN 203236085 U CN203236085 U CN 203236085U
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Abstract
The utility model relates to electric soldering iron, in particular to the electric soldering iron using a digital display voltmeter to display the temperature. The constant-temperature electric soldering iron comprises a soldering iron core and a thermistor used for detecting the temperature of the soldering iron core, and further comprises an amplifying circuit, a comparator circuit, a switching circuit and the digital display voltmeter, wherein the amplifying circuit is used for amplifying a voltage signal of the thermistor, the comparator circuit is used for carrying out comparison between the voltage signal output by the amplifying circuit and an adjustable voltage source, and outputting a corresponding voltage signal according to the result of comparison, the switching circuit is used for carrying out switch-on or switch-off on a power source of the soldering iron core according to the voltage signal output by the comparator circuit, the digital display voltmeter is used for displaying a corresponding temperature numerical value according to the voltage signal output by the comparator circuit, and the input end of the digital display voltmeter is connected with the output end of the comparator circuit. The constant-temperature electric soldering iron can carry out real-time accurate temperature display, and is simple in circuit structure and low in cost.
Description
Technical field
The utility model relates to electric iron, is specifically related to utilize the electric iron of digital display voltmeter head displays temperature.
Background technology
The constant temperature electric iron of selling on the market now has the demonstration of band temperature and is not with temperature to show two kinds.Not with temperature show the most general with Japanese white light 936 types or imitative Japanese white light 936 types, the advantage of this kind constant temperature electric iron is that circuit is simple, does not use single-chip microcomputer, does not need software control, cost is low; Shortcoming is to indicate roughly temperature by temperature adjustment knob, and the user can't accurately know the temperature of flatiron in real time.And what show with temperature is to use Single-chip Controlling substantially, its temperature displaying principle is: the inner thermistor of heating core for electric iron transfers to single-chip microcomputer with the solder horn temperature, single-chip microcomputer is exported data through after the computing, drive 7 segment numeral pipes, displays temperature, so its circuit comprises software and hardware two parts, circuit is complicated, and cost is high.
Hence one can see that, in the constant temperature electric iron of prior art, and the accurately displays temperature that circuit is simple, cost is low, and accurately the circuit of displays temperature is complicated, cost is high.
The utility model content
For this reason, the purpose of this utility model is to provide a kind of constant temperature electric iron, and its circuit is simple, and can be in real time accurate displays temperature.
The utility model is by the following technical solutions:
A kind of constant temperature electric iron, the thermistor that comprises iron core and detect the temperature of described iron core; Described constant temperature electric iron also comprises:
Amplify the amplifying circuit of the voltage signal of described thermistor, the described thermistor of its input termination;
Voltage signal and the variable voltage source of the output of described amplifying circuit are compared, and export the comparison circuit of corresponding voltage signal according to comparative result, its first input end connects the output, second of described amplifying circuit and inputs the termination variable voltage source;
According to the voltage signal conducting of described comparison circuit output or disconnect the on-off circuit of the power supply of described iron core, the output of the described comparison circuit of its controlled termination, input termination V+ power supply, the described iron core of output termination;
Show the digital display voltmeter head of relevant temperature numerical value, the output of the described comparison circuit of its input termination according to the voltage signal of described comparison circuit output.
The constant temperature electric iron that the utility model provides, detect the temperature of described iron core by described thermistor, amplify the voltage signal of described thermistor by described amplifying circuit, compare by voltage signal and the variable voltage source of described comparison circuit with described amplifying circuit output, adopt described digital display voltmeter head to show that the voltage signal according to described comparison circuit output shows relevant temperature numerical value.Therefore, the constant temperature electric iron that the utility model provides, its circuit structure is simple in real time accurate displays temperature, and cost is low.
Description of drawings
The schematic block circuit diagram of the constant temperature electric iron that Fig. 1 provides for the utility model embodiment;
The circuit theory diagrams of the constant temperature electric iron that Fig. 2 provides for the utility model embodiment.
The specific embodiment
For making the purpose of this utility model, technical scheme and advantage clearer, below in conjunction with drawings and the specific embodiments the utility model is described in further detail.
With reference to Fig. 1, the schematic block circuit diagram of the constant temperature electric iron that the utility model embodiment provides.
A kind of constant temperature electric iron comprises iron core CON2 and the thermistor that detects the temperature of iron core CON2; Constant temperature electric iron also comprises: amplify the amplifying circuit 1 of the voltage signal of thermistor, its input termination thermistor; Voltage signal and the variable voltage source 21 of amplifying circuit 1 output are compared, and export the comparison circuit 2 of corresponding voltage signal according to comparative result, its first input end connects the output, second of amplifying circuit 1 and inputs termination variable voltage source 21; According to the voltage signal conducting of comparison circuit 2 output or disconnect the on-off circuit 3 of the power supply of iron core CON2, the output of its controlled termination comparison circuit 2, input termination V+ power supply, output termination iron core CON2; Show the digital display voltmeter head 4 of relevant temperature numerical value, the output of its input termination comparison circuit 2 according to the voltage signal of comparison circuit 2 output.
The constant temperature electric iron that the utility model provides, detect the temperature of iron core CON2 by thermistor, amplify the voltage signal of thermistor by amplifying circuit 1, compare by voltage signal and the variable voltage source 21 of comparison circuit 2 with amplifying circuit 1 output, adopt digital display voltmeter head 4 to show relevant temperature numerical value according to the voltage signal of comparison circuit 2 outputs.Therefore, the constant temperature electric iron that the utility model provides, its circuit structure is simple in real time accurate displays temperature, and cost is low.
With reference to Fig. 2, the circuit theory diagrams of the constant temperature electric iron that the utility model embodiment provides.
In the present embodiment, thermistor is negative tempperature coefficient thermistor CON1.Following circuit connecting relation and operation principle all explain with negative tempperature coefficient thermistor.
Amplifying circuit 1 comprises resistance R 4, resistance R 5, resistance R 6, resistance R 7, resistance R 9, resistance R 10, adjustable resistance VR2, amplifier U1A; The VCC power supply is successively by resistance R 9, negative tempperature coefficient thermistor CON1 ground connection; The VCC power supply connects the inverting input of amplifier U1A successively by resistance R 7, resistance R 5, resistance R 4, adjustable resistance VR2 is connected between the common port and ground of resistance R 7 and resistance R 5, and resistance R 6 is connected between the common port and ground of resistance R 5 and resistance R 4; The in-phase input end of amplifier U1A is by the common port of resistance R 10 connecting resistance R9 and negative tempperature coefficient thermistor CON1.
Amplifying circuit 1 comprises that also filtering negative tempperature coefficient thermistor CON1 transfers to the electrochemical capacitor C2 of the noise signal of amplifier U1A.This electrochemical capacitor C2 that connects, it is more stable to make negative tempperature coefficient thermistor CON1 input to the signal of amplifier U1A.
Amplifying circuit 1 also comprises negative feedback resistor R17, the resistance R 3 that makes circuit working more stable; Resistance R 17 and resistance R 3 are parallel to respectively between the output and inverting input of amplifier U1A.This negative feedback resistor R17, the resistance R 3 that connect can make this amplifying circuit 1 more stable work.
On-off circuit 3 comprises resistance R 2, resistance 18, resistance R 20, resistance R 21, resistance R 22, NPN type triode Q1, positive-negative-positive triode Q2; The output of amplifier U1B is by resistance R 2, resistance R 21 ground connection, the base stage connecting resistance R2 of NPN type triode Q1 and the common port of resistance R 21, emitter stage connect the V+ power supply by resistance R 20 ground connection, colelctor electrode by resistance R 18, and colelctor electrode, the emitter stage that the base stage of positive-negative-positive triode Q2 meets NPN type triode Q1 connects the V+ power supply, colelctor electrode meets iron core CON2 by resistance R 22 ground connection, colelctor electrode.
On-off circuit 3 also comprises the LED1 of indication iron core CON2 energising, and the anode of LED1 connects colelctor electrode, the minus earth of positive-negative-positive triode Q2 by resistance R 22.
The sampled signal input pin of digital display voltmeter head 4 connects the output of amplifier U1B by resistance R 24.
The operation principle of the circuit theory diagrams of the constant temperature electric iron that provides below in conjunction with Fig. 2 is described further.
Negative tempperature coefficient thermistor CON1 is the in-phase input end that transfers to amplifier U1A behind the voltage signal with the temperature transition of solder horn CON2; Resistance R 4, resistance R 5, resistance R 6, resistance R 7, adjustable resistance VR2 form the first potential-divider network jointly, can set the voltage of the inverting input of amplifier U1A by regulating adjustable resistance VR2; Compare with the signal that inverting input the is inputted output voltage of rear its output of control of the in-phase input end of amplifier U1A.
Transfer to the inverting input of amplifier U1B after the voltage resistance R1 isolation of the output output of amplifier U1A; Resistance R 8, resistance R 11, resistance R 16, adjustable resistance VR1 form the second potential-divider network jointly, can set the voltage of the in-phase input end of amplifier U1B by regulating adjustable resistance VR1; Compare with the signal that inverting input the is inputted output voltage of rear its output of control of the in-phase input end of amplifier U1B.
Control conducting or the cut-off of positive-negative-positive triode Q2 after the one-level amplifying circuit amplification of the voltage that the output of amplifier U1B is exported through NPN type triode Q1 and peripheral resistance composition thereof, thus the power supply of conducting or disconnection iron core CON2.
The sampled signal input pin of digital display voltmeter head 4 connects the output of amplifier U1B by resistance R 24, shows relevant temperature numerical value according to the voltage signal of comparison circuit 2 outputs.
The adjustable resistance VR2 of the first potential-divider network is the correction adjustable resistance of the digital display voltmeter head 4 of this constant temperature electric iron, is mainly to produce debugging usefulness, does not do the user and uses; Adjustment potentiometer when the adjustable resistance VR1 of the second potential-divider network uses for this constant temperature electric iron is for the user uses.
The principle of digital display voltmeter head 4 displays temperatures of proofreading and correct this constant temperature electric iron is as follows: regulate adjustable resistance VR1 in a setting value, detect the temperature of solder horn CON2 with thermometer, if the temperature that the temperature that digital display voltmeter head 4 is shown and thermometer detect has deviation, regulate the adjustable resistance VR2 of the first potential-divider network, make both temperature values consistent.Repeatedly regulate adjustable resistance VR1 in different values, to guarantee the accuracy of the temperature that digital display voltmeter head 4 is shown.
Be the utility model preferred embodiment only below, be not limited to the utility model, all any modifications of within principle of the present utility model, doing, be equal to and replace and improvement etc., all should be included within the scope of the utility model protection.
Claims (9)
1. constant temperature electric iron, the thermistor that comprises iron core and detect the temperature of described iron core; It is characterized in that described constant temperature electric iron also comprises:
Amplify the amplifying circuit (1) of the voltage signal of described thermistor, the described thermistor of its input termination;
Voltage signal and the variable voltage source (21) of described amplifying circuit (1) output are compared, and export the comparison circuit (2) of corresponding voltage signal according to comparative result, its first input end connects output, the second input termination variable voltage source (21) of described amplifying circuit (1);
According to the voltage signal conducting of described comparison circuit (2) output or disconnect the on-off circuit (3) of the power supply of described iron core, the output of the described comparison circuit of its controlled termination (2), input termination V+ power supply, the described iron core of output termination;
Show the digital display voltmeter head (4) of relevant temperature numerical value, the output of its input described comparison circuit of termination (2) according to the voltage signal of described comparison circuit (2) output.
2. constant temperature electric iron as claimed in claim 1 is characterized in that, described thermistor is negative tempperature coefficient thermistor.
3. constant temperature electric iron as claimed in claim 2 is characterized in that, described amplifying circuit (1) comprises resistance R 4, resistance R 5, resistance R 6, resistance R 7, resistance R 9, resistance R 10, adjustable resistance VR2, amplifier U1A;
The VCC power supply is successively by described resistance R 9, described negative tempperature coefficient thermistor ground connection; The VCC power supply connects the inverting input of described amplifier U1A successively by described resistance R 7, described resistance R 5, described resistance R 4, described adjustable resistance VR2 is connected between the common port and ground of described resistance R 7 and described resistance R 5, and described resistance R 6 is connected between the common port and ground of described resistance R 5 and described resistance R 4; The in-phase input end of described amplifier U1A connects the common port of described resistance R 9 and described negative tempperature coefficient thermistor by described resistance R 10.
4. constant temperature electric iron as claimed in claim 3 is characterized in that, described amplifying circuit (1) comprises that also the described negative tempperature coefficient thermistor of filtering transfers to the electrochemical capacitor C2 of the noise signal of described amplifier U1A.
5. constant temperature electric iron as claimed in claim 3 is characterized in that, described amplifying circuit (1) also comprises negative feedback resistor R17, the resistance R 3 that makes circuit working more stable; Described resistance R 17 and described resistance R 3 are parallel to respectively between the output and inverting input of described amplifier U1A.
6. constant temperature electric iron as claimed in claim 3 is characterized in that, described comparison circuit (2) comprises amplifier U1B, resistance R 1, capacitor C 1;
Described variable voltage source (21) comprises resistance R 8, resistance R 11, resistance R 16, adjustable resistance VR1;
Described amplifier U1B the inverting input output, in-phase input end that meet described amplifier U1A by described resistance R 1 connect the adjustable side of described adjustable resistance VR1 by described resistance R 11, the first fixed end of described adjustable resistance VR1 connects VCC power supply, the second fixed end by described resistance R 8 ground connection by described resistance R 16; Described capacitor C 1 is connected between the output and in-phase input end of described amplifier U1B.
7. constant temperature electric iron as claimed in claim 6 is characterized in that, described on-off circuit (3) comprises resistance R 2, resistance 18, resistance R 20, resistance R 21, resistance R 22, NPN type triode Q1, positive-negative-positive triode Q2;
The output of described amplifier U1B is by described resistance R 2, described resistance R 21 ground connection, common port, emitter stage that the base stage of described NPN type triode Q1 connects described resistance R 2 and described resistance R 21 connect the V+ power supply by described resistance R 20 ground connection, colelctor electrode by described resistance R 18, and colelctor electrode, the emitter stage that the base stage of described positive-negative-positive triode Q2 meets described NPN type triode Q1 connects the V+ power supply, colelctor electrode connects described iron core by described resistance R 22 ground connection, colelctor electrode.
8. constant temperature electric iron as claimed in claim 7 is characterized in that, described on-off circuit (3) also comprises the LED1 of the described iron core energising of indication, and the anode of described LED1 connects colelctor electrode, the minus earth of described positive-negative-positive triode Q2 by described resistance R 22.
9. constant temperature electric iron as claimed in claim 7 is characterized in that, the sampled signal input pin of described digital display voltmeter head (4) connects the output of described amplifier U1B by resistance R 24.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320188855 CN203236085U (en) | 2013-04-15 | 2013-04-15 | Constant-temperature electric soldering iron |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320188855 CN203236085U (en) | 2013-04-15 | 2013-04-15 | Constant-temperature electric soldering iron |
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| Publication Number | Publication Date |
|---|---|
| CN203236085U true CN203236085U (en) | 2013-10-16 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320188855 Expired - Fee Related CN203236085U (en) | 2013-04-15 | 2013-04-15 | Constant-temperature electric soldering iron |
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| CN (1) | CN203236085U (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103949745A (en) * | 2014-05-13 | 2014-07-30 | 国家电网公司 | Control circuit for ensuring stable work of soldering iron electric heating wire |
| CN104842037A (en) * | 2013-10-23 | 2015-08-19 | 南安市柳城高捷图文设计工作室 | Constant-temperature clamp-type electric iron heat dissipation holder |
| CN110935976A (en) * | 2018-09-25 | 2020-03-31 | Ok国际公司 | Intelligent soldering iron tip and verification method thereof |
| CN111673224A (en) * | 2020-06-01 | 2020-09-18 | 高健 | Rechargeable lithium battery electric soldering iron device with temperature adjusting, temperature controlling and constant temperature functions |
| CN113894379A (en) * | 2021-11-18 | 2022-01-07 | 深圳市安泰信科技有限公司 | Constant temperature circuit for electric soldering iron and electric soldering iron |
-
2013
- 2013-04-15 CN CN 201320188855 patent/CN203236085U/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104842037A (en) * | 2013-10-23 | 2015-08-19 | 南安市柳城高捷图文设计工作室 | Constant-temperature clamp-type electric iron heat dissipation holder |
| CN104842037B (en) * | 2013-10-23 | 2016-08-17 | 南安市柳城高捷图文设计工作室 | A kind of Clip-type constant-temperatureelectric electric soldering iron temperature dispersing frame |
| CN103949745A (en) * | 2014-05-13 | 2014-07-30 | 国家电网公司 | Control circuit for ensuring stable work of soldering iron electric heating wire |
| CN110935976A (en) * | 2018-09-25 | 2020-03-31 | Ok国际公司 | Intelligent soldering iron tip and verification method thereof |
| CN110935976B (en) * | 2018-09-25 | 2021-06-11 | Ok国际公司 | Intelligent soldering iron tip and verification method thereof |
| CN111673224A (en) * | 2020-06-01 | 2020-09-18 | 高健 | Rechargeable lithium battery electric soldering iron device with temperature adjusting, temperature controlling and constant temperature functions |
| CN113894379A (en) * | 2021-11-18 | 2022-01-07 | 深圳市安泰信科技有限公司 | Constant temperature circuit for electric soldering iron and electric soldering iron |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20131016 Termination date: 20170415 |
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| CF01 | Termination of patent right due to non-payment of annual fee |