CN219087321U - Heating control circuit - Google Patents
Heating control circuit Download PDFInfo
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- CN219087321U CN219087321U CN202222556191.2U CN202222556191U CN219087321U CN 219087321 U CN219087321 U CN 219087321U CN 202222556191 U CN202222556191 U CN 202222556191U CN 219087321 U CN219087321 U CN 219087321U
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Abstract
The application relates to a heating control circuit, which belongs to the technical field of electronic circuits and comprises a main control unit for outputting control signals; the input end of the control unit is connected with the main control unit, and the control unit receives the control signal and outputs a voltage signal; the input end of the isolation unit receives the voltage signal and outputs a first switch signal; the switch unit comprises an input end, an output end and a control end, wherein the input end is connected with the mains supply, the control end receives the first switch signal and is used for conducting the input end and the output end, and the output end is used for outputting the mains supply; and the heating unit is connected with the output end of the switch unit and used for heating the electronic element. The application has the advantages of simple circuit design, low cost, uniform heating and enough temperature to reduce the damage effect on the device for disassembling and welding.
Description
Technical Field
The present application relates to the field of electronic circuits, and in particular, to a heating control circuit.
Background
When the electronic component is processed or repaired, the electronic component is required to be disassembled and welded, and the soldering tin of the electronic component is heated by a heating table to be melted and then disassembled and welded, but the heating table which is heated by circuit control at present has the problems of complex circuit and high cost, and the disassembly of the electronic component is influenced by uneven temperature or insufficient temperature of the heating table, so that the component is damaged, the subsequent production and use are influenced, and the improvement is needed.
Disclosure of Invention
In order to solve the problem that the current heating table circuit is complex and high in cost, the application provides a heating control circuit.
The application provides a heating control circuit adopts following technical scheme:
a heating control circuit comprising:
the main control unit is used for outputting control signals;
the input end of the control unit is connected with the main control unit, and the control unit
Receiving the control signal and outputting a voltage signal;
the input end of the isolation unit receives the voltage signal and outputs a first switch
An off signal;
the switch unit comprises an input end, an output end and a control end, wherein the input end and the city
The control end receives the first switch signal and is used for conducting the input end and the output end, and the output end is used for outputting commercial power;
the heating unit is connected with the output end of the switch unit and is used for conducting electronic elements
And (5) heating.
By adopting the technical scheme, the main control unit outputs the control signal to the control unit, and the control unit controls the sheet
The element is conducted and outputs a voltage signal to enable the isolation unit to be conducted, the isolation unit outputs a first switching signal to the switching unit to enable the input end and the output end of the switching unit to be conducted, the output end outputs commercial power to the heating unit, the heating unit is electrified to generate heat, therefore heating of electronic elements can be achieved, the whole circuit is simple and practical in design, and the circuit has cost advantages when being functionally achieved.
Preferably, the heating device further comprises a detection unit, wherein the detection unit comprises a detection sensor, the detection sensor is connected with the main control unit, and the detection sensor is used for judging whether the heating cover of the heating table is covered or not.
By adopting the technical scheme, the detection sensor is used for judging whether the heating cover of the heating table is covered or not and transmitting detection induction signals to the main control unit.
Preferably, the isolation unit comprises a photoelectric coupler and a first resistor, wherein a first input end of the photoelectric coupler is connected with the first resistor, the other end of the first resistor is connected with a power supply, and a second input end of the photoelectric coupler is connected with an output end of the control unit.
By adopting the technical scheme, when the power supply signal and the output signal of the control unit are input into the photoelectricity
And the coupler is communicated between the first input end and the second input end of the photoelectric coupler and couples signals to the output end, and the output end outputs a first switching signal to realize isolation and transmission between the input signal and the output signal.
Preferably, the control unit includes a triode, a second resistor and a third resistor, the collector electrode of the triode is connected with the second input end of the isolation unit, one end of the second resistor is connected with the base electrode of the triode, one end, far away from the collector electrode, of the second resistor is connected with the main control unit, the emitter electrode of the triode is grounded, and the third resistor is connected between the base electrode and the emitter electrode of the triode.
By adopting the technical scheme, the main control unit outputs a control signal to the base electrode of the triode when
When the input control signal is higher than the starting voltage of the triode, the collector and the emitter of the triode are conducted, so that the second input end of the isolation unit is conducted to the ground, and the control of the control unit on the isolation unit is realized.
Preferably, the switch unit includes a thyristor switch tube, a fourth resistor and a fifth resistor, wherein one end of the fourth resistor is connected with the first output end of the isolation unit, the other end of the fourth resistor is connected with the cathode of the thyristor switch tube, one end of the fifth resistor is connected with the second output end of the isolation unit, the other end of the fifth resistor is connected with the anode of the thyristor switch tube, and the control electrode of the thyristor switch tube is connected between the second output end of the isolation unit and the fifth resistor.
By adopting the technical scheme, the fourth resistor and the fifth resistor can be a thyristor switch
The voltage input between the cathode and the anode of the tube is divided, so that the input voltage reaches the voltage range in which the thyristor is conducted, and the thyristor is protected.
Preferably, the heating unit comprises two input ends, one input end of the heating unit is connected with the output end of the switch unit, and the other input end of the heating unit is connected with the zero line.
By adopting the technical scheme, the heating unit is electrified and heated to provide melting welding for the electronic element
Tin temperature.
Preferably, the detection unit further includes a sixth resistor, a seventh resistor, an eighth resistor and a first capacitor, wherein the sixth resistor is connected between a power supply end and an output end of the detection sensor, a connection node between the sixth resistor and the output end of the detection sensor is connected with the first capacitor, one end of the first capacitor, which is far away from the sixth resistor, is grounded, the seventh resistor and the eighth resistor are connected in series with the output end of the detection sensor, one end of the eighth resistor, which is far away from the seventh resistor, is grounded, the connection node of the seventh resistor and the eighth resistor is used for outputting a detection sensing signal, the power supply end of the detection sensor is connected with the power supply, and the ground is grounded.
By adopting the technical scheme, the detection sensor senses the existence of the magnetic field and outputs a signal for detection
And when the detection sensor outputs a high signal, the effective magnetic field is not sensed, the protective cover of the heating table is not closed at the moment, and the main control unit judges whether the heating table heats according to whether the heating switch key is pressed and whether the preset temperature is reached.
In summary, the present application includes at least one of the following beneficial technical effects:
1. the main control unit outputs a control signal to the control unit to control the conduction of the control unit, so that the isolation unit and the switch unit are conducted, the heating unit is electrified and heated, the electronic element is heated, the whole circuit is simple in design and easy to realize, the cost can be reduced on the basis of realizing control heating, and the practicability is high.
2. The detection unit is additionally arranged, so that the automatic operation of the heating flow of the heating table is realized, and the working efficiency is improved.
Drawings
Fig. 1 is a schematic diagram of a connection structure of a heating control circuit according to an embodiment of the present application.
Fig. 2 is a schematic diagram of a connection structure of a hall sensing circuit according to an embodiment of the present application.
Reference numerals illustrate: 1. a main control unit; 2. a control unit; 3. an isolation unit; 4. a switching unit; 5. a heating unit; 6. and a detection unit.
Detailed Description
The present application is described in further detail below in conjunction with figures 1-2.
The embodiment of the application discloses a heating control circuit. Referring to fig. 1 and 2, comprising:
a main control unit 1 for outputting a control signal;
the input end of the control unit 2 is connected with the main control unit 1, and the control unit 2 receives the control signal and outputs a voltage signal;
the input end of the isolation unit 3 receives the voltage signal and outputs a first switching signal;
the switch unit 4 comprises an input end, an output end and a control end, wherein the input end is connected with the mains supply, the control end receives a first switch signal and is used for conducting the input end and the output end, and the output end is used for outputting the mains supply;
and the heating unit 5 is connected with the output end of the switch unit 4 and used for heating the electronic element.
The detecting unit 6 comprises a detecting sensor which is connected with the main control unit 1 and used for judging whether the heating cover of the heating table is covered or not.
The detection unit 6 judges whether the heating cover of the heating platform is covered or not, the detection signal is transmitted to the main control unit 1, if the heating cover is covered, the main control unit 1 outputs a control signal to be low, if the heating cover is not covered, the main control unit 1 judges whether the heating platform is heated or not according to whether a heating switch key is pressed and whether a preset temperature is reached, when the heating platform needs to be heated, the main control unit 1 outputs the control signal to the control unit 2, the control unit 2 is conducted and outputs a voltage signal to enable the isolation unit 3 to be conducted, the isolation unit 3 outputs a first switch signal to the switch unit 4 to enable conduction between the input end and the output end of the switch unit 4, the output end outputs commercial power to the heating unit 5, the heating unit 5 is electrified to generate heat, therefore heating of an electronic element can be achieved, the whole circuit design is simple, cost can be reduced on the basis of realizing a control heating function, and practicability is high.
The isolation unit 3 comprises a photoelectric coupler U1 and a first resistor R1, the control unit 2 comprises a triode Q1, a second resistor R2 and a third resistor R3, the first input end of the photoelectric coupler U1 is connected with one end of the first resistor R1, the other end of the first resistor R1 is connected with a power supply, the collector of the triode Q1 is connected with the second input end of the photoelectric coupler U1, the base of the triode Q1 is connected with one end of the second resistor R2, the second resistor R2 is connected with the main control unit 1, the emitter of the triode Q1 is grounded, and the third resistor R3 is connected between the base and the emitter of the triode Q1.
When the input control signal is higher than the starting voltage of the triode Q1, the collector electrode and the emitter electrode of the triode Q1 are conducted, the second input end of the photoelectric coupler U1 is grounded, and when the first input end of the photoelectric coupler U1 is connected with a power supply signal, the first input end and the second input end of the photoelectric coupler U1 are conducted, so that the control of the control unit 2 on the opening and the closing of the photoelectric coupler U1 is realized.
The switch unit 4 comprises a thyristor switch tube U2, a fourth resistor R4 and a fifth resistor R5, one end of the fourth resistor R4 is connected with the first output end of the photoelectric coupler U1, the other end of the fourth resistor R4 is connected with the cathode of the thyristor switch tube U2, one end of the fifth resistor R5 is connected with the second output end of the photoelectric coupler U1, the other end of the fifth resistor R5 is connected with the anode of the thyristor switch tube U2, and the control electrode of the thyristor switch tube U2 is connected between the second output end of the photoelectric coupler U1 and the fifth resistor R5. The heating unit 5 includes two input, and the output of switch unit 4 is connected to heating unit 5 input, and the zero line is connected to another input, and this application heating unit 5 adopts piece U3 that generates heat.
After the photoelectric coupler U1 is conducted, a first switching signal is output between the first output end and the second output end to the thyristor switching tube U2, the thyristor switching tube U2 is conducted, a voltage signal is output to the heating sheet U3, and the heating sheet U3 is electrified to heat, so that the heating of the electronic element is realized.
Referring to fig. 2, the detecting unit 6 further includes a sixth resistor, a seventh resistor, an eighth resistor and a first capacitor, where the detecting sensor of the present application employs a hall sensor U4, the sixth resistor is connected between a power end and an output end of the detecting sensor, a connection node between the sixth resistor and the output end of the detecting sensor is connected with the first capacitor, one end of the first capacitor far away from the sixth resistor is grounded, the seventh resistor and the eighth resistor are connected in series to the output end of the detecting sensor, one end of the eighth resistor far away from the seventh resistor is grounded, a connection node between the seventh resistor and the eighth resistor is used for outputting a detection sensing signal to the main control unit 1, the power end of the detecting sensor is connected with the power source, and the ground is grounded.
The heating platform is provided with a protective cover, a magnet is arranged on the protective cover, the detection sensor senses that a magnetic field exists, so that output signals are detected to be low, namely, the heating platform is already covered with the protective cover and does not need to be heated, if the output signals of the detection sensor are high, no effective magnetic field is sensed, namely, the heating platform is not covered with the protective cover, whether a device heating switch key is pressed down or not and whether a set temperature value reaches or not, and whether the heating platform is heated or not is judged.
Through the mode that utilizes the thyristor switch tube control heating piece that generates heat for heat evenly distributed is at the surface of piece that generates heat, and can hug closely when using and place the metal piece on the piece that generates heat, make the metal piece temperature wholly rise through heat transfer, and place the temperature measurement line in the metal piece region, make the temperature of metal piece stabilize in the temperature value department of settlement, to the area of dismantling welding that is the encapsulation component that the pin is more, can place on the heating platform metal piece of having set for suitable operating temperature, because the metal piece wholly is on suitable dismantling welding temperature, when equipment such as welding platform or hot air gun can not appear when dismantling welding, because the insufficient tin pearl of local temperature does not melt, thereby arouse the component dismantlement damage. When the circuit board with more elements is welded, the elements to be welded can be placed at the positions of the corresponding bonding pads, the heating temperature and the heating time are set, the welding can be completed at one time, and the method is simple and convenient in small-batch operation and has the advantage of high cost.
The implementation principle of the heating control circuit in the embodiment of the application is as follows: when the detection sensor senses that the protective cover is covered, the output signal is low, the heating table is not heated, when the detection sensor senses that the protective cover is not covered, the output signal is high, at the moment, the main control unit 1 judges whether the heating table is heated according to whether the heating switch key is pressed and whether the set temperature reaches, when the heating table needs to be heated, the main control unit 1 outputs a control signal to be high, the triode Q1 is started, the collector and the emitter of the triode Q1 are conducted, the first input end of the photoelectric coupler U1 is input with a power supply signal, the second input end of the photoelectric coupler U1 is grounded, the input end of the photoelectric coupler U1 is conducted, a first switch signal is output between the first output end and the second output end of the photoelectric coupler U1, the cathode and the anode of the silicon controlled switch tube U2 are conducted, a voltage signal is output to the heating sheet U3, and the heating sheet U3 is electrified, so that the electronic element is heated.
The foregoing are all preferred embodiments of the present application, and are not intended to limit the scope of the present application in any way, therefore: all equivalent changes in structure, shape and principle of this application should be covered in the protection scope of this application.
Claims (7)
1. A heating control circuit, comprising:
the main control unit (1) is used for outputting control signals;
the input end of the control unit (2) is connected with the main control unit (1), and the control unit (2)
The control unit (2) receives the control signal and outputs a voltage signal;
an isolation unit (3), wherein the input end of the isolation unit (3) receives the voltage signal and outputs
A first switching signal;
a switch unit (4), wherein the switch unit (4) comprises an input end, an output end and a control end, and is input
The control end receives the first switch signal and is used for conducting the input end and the output end, and the output end is used for outputting the mains supply;
a heating unit (5), wherein the heating unit (5) is connected with the output end of the switch unit (4) and is used for opposite
The electronic component is heated.
2. The heating control circuit according to claim 1, further comprising a detection unit (6), wherein the detection unit (6) comprises a detection sensor connected to the main control unit (1), and the detection sensor is used for judging whether the heating cover of the heating table is covered.
3. A heating control circuit according to claim 1, characterized in that the isolation unit (3) comprises a photo-coupler and a first resistor, a first input of the photo-coupler being connected to the first resistor, the other end of the first resistor being connected to a power supply, a second input of the photo-coupler being connected to an output of the control unit (2).
4. The heating control circuit according to claim 1, wherein the control unit (2) comprises a triode, a second resistor and a third resistor, the collector of the triode is connected with the second input end of the isolation unit (3), one end of the second resistor is connected with the base of the triode, one end of the second resistor, which is far away from the collector, is connected with the main control unit (1), the emitter of the triode is grounded, and the third resistor is connected between the base and the emitter of the triode.
5. The heating control circuit according to claim 2, wherein the switching unit (4) comprises a thyristor, a fourth resistor and a fifth resistor, one end of the fourth resistor is connected to the first output end of the isolation unit (3), the other end is connected to the cathode of the thyristor, one end of the fifth resistor is connected to the second output end of the isolation unit (3), the other end is connected to the anode of the thyristor, and the control electrode of the thyristor is connected between the second output end of the isolation unit (3) and the fifth resistor.
6. A heating control circuit according to claim 1, characterized in that the heating unit (5) comprises two inputs, one input of the heating unit (5) being connected to the output of the switching unit (4) and the other input being connected to the neutral line.
7. The heating control circuit according to claim 2, wherein the detection unit (6) further includes a sixth resistor, a seventh resistor, an eighth resistor, and a first capacitor, the sixth resistor being connected between a power supply terminal and an output terminal of the detection sensor, a connection node between the sixth resistor and the output terminal of the detection sensor being connected to the first capacitor, the first capacitor being grounded at a terminal remote from the sixth resistor, the seventh resistor and the eighth resistor being connected in series at the output terminal of the detection sensor, the eighth resistor being grounded at a terminal remote from the seventh resistor, the connection node of the seventh resistor and the eighth resistor being configured to output a detection sensing signal, the power supply terminal of the detection sensor being connected to a power supply terminal, and a ground terminal being grounded.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222556191.2U CN219087321U (en) | 2022-09-26 | 2022-09-26 | Heating control circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222556191.2U CN219087321U (en) | 2022-09-26 | 2022-09-26 | Heating control circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219087321U true CN219087321U (en) | 2023-05-26 |
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ID=86393889
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202222556191.2U Active CN219087321U (en) | 2022-09-26 | 2022-09-26 | Heating control circuit |
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| Country | Link |
|---|---|
| CN (1) | CN219087321U (en) |
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2022
- 2022-09-26 CN CN202222556191.2U patent/CN219087321U/en active Active
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