CN111190362B

CN111190362B - Solder fume processing circuit and processing method thereof

Info

Publication number: CN111190362B
Application number: CN201811360112.2A
Authority: CN
Inventors: 郭清泉; 邱碧玉
Original assignee: O2micro Electronics Wuhan Co ltd
Current assignee: O2micro Electronics Wuhan Co ltd
Priority date: 2018-11-15
Filing date: 2018-11-15
Publication date: 2021-11-23
Anticipated expiration: 2038-11-15
Also published as: CN111190362A

Abstract

A soldering tin smoke processing circuit and a processing method thereof are provided. The method comprises the following steps that an infrared sensor detects the human body entering condition of an operation table within a first preset range to obtain a first induction signal, and the first induction signal is sent to a controller; the illumination sensor detects the illumination intensity of the operating platform within a second preset range to obtain a second induction signal, and the second induction signal is sent to the controller; the controller generates a first control signal according to the first induction signal to control the connection/disconnection of the first switch unit, and generates a second control signal according to the second induction signal to control the connection/disconnection of the second switch unit; the air draft unit is started when the first switch unit and the second switch unit are both switched on. When someone carries out soldering on the operation table, the circuit is automatically conducted, smoke generated by soldering is absorbed, and toxicity is reduced; when people are far away, the automatic disconnection is realized, and the energy is saved.

Description

Solder fume processing circuit and processing method thereof

Technical Field

The invention relates to the technical field of intellectualization, in particular to a soldering tin smoke processing circuit and a processing method thereof.

Background

Along with the development of the electronic industry, more and more workers are engaged in electronic components, and it is worth noting that the workers need to perform soldering tin operation almost every day, and during soldering tin, on one hand, a large amount of components harmful to human bodies, such as carbon monoxide, carbon dioxide, methanol, solid particles and the like, are generated, so that the soldering tin has a strong stimulation effect on eyes, noses and respiratory tracts of people, and has great harm to internal organs and nervous systems, such as heart, lungs, liver and the like, even acute and chronic poisoning is caused, carcinogenesis, mutation and the like can be caused, and the body health of the workers is seriously influenced; on the other hand, as the soldering is generally carried out in the soldering tin chamber, the testing or debugging is usually required after the soldering, so that the worker usually needs to go back and forth between the soldering tin chamber and the testing, if a conventional soldering tin smoke processing circuit is used, the switch of the soldering tin smoke processing circuit needs to be frequently turned on or turned off, and great inconvenience is brought to the work of the worker.

Disclosure of Invention

The invention provides a soldering tin smog processing circuit which is used for intelligently absorbing smog generated by soldering tin on an operation table. The circuit comprises a first switch unit, a second switch unit, an air draft unit, a controller, an infrared sensor and an illumination sensor. The first switch unit is coupled between the power supply unit and the air draft unit, and the second switch unit is coupled between the controller and the air draft unit.

The electric energy required by the air draft unit, the controller, the infrared sensor and the illumination sensor is provided by the power supply unit. The infrared sensor is used for detecting the human body entering condition of the operating platform in a first preset range, obtaining a first induction signal and sending the first induction signal to the controller. The illumination sensor is used for detecting the illumination intensity of the operating platform within a second preset range to obtain a second sensing signal, and the second sensing signal is sent to the controller. The controller is used for generating a first control signal according to the first induction signal so as to control the on/off state of the first switch unit; the second switch unit is used for generating a second sensing signal according to the first sensing signal and generating a second control signal according to the second sensing signal so as to control the on/off state of the second switch unit; the air draft unit is used for starting when the first switch unit and the second switch unit are both switched on.

The invention also provides a soldering tin smoke processing method by utilizing the soldering tin smoke processing circuit. The method comprises the following steps: the infrared sensor detects the human body entering condition of the operating platform within a first preset range to obtain a first induction signal, and the first induction signal is sent to the controller; when the controller judges that the first induction signal contains a human body signal, the controller controls the first switch unit to be conducted; the illumination sensor detects illumination intensity of the operating platform within a second preset range to obtain a second induction signal, and the second induction signal is sent to the controller; and when the controller judges that the second induction signal is lower than the preset value, the controller controls the second switch unit to be conducted, and the air draft unit is started.

By using the soldering tin smoke processing circuit, the first switch unit can be automatically opened when a human body enters a first preset range, the printed circuit board shields part of light rays when the printed circuit board is welded, the illumination intensity is weakened and is lower than a preset value, the second switch unit is automatically opened, the air draft unit is started, smoke generated during soldering tin is absorbed, the harm of the smoke to the human body is reduced, meanwhile, the automatic switch releases manpower, and electric energy is also saved.

Drawings

The objects, specific structural features and advantages of the present invention may be further understood by the following description in conjunction with the several embodiments of the present invention and the accompanying drawings.

Fig. 1 is a schematic diagram of a solder fume processing circuit according to an embodiment of the present invention.

Fig. 2 is a specific circuit diagram of a solder fume processing circuit according to an embodiment of the present invention.

Fig. 3 is a flow chart illustrating a solder fume processing method according to an embodiment of the present invention.

Detailed Description

Hereinafter, a detailed description will be given of embodiments of the present invention. While the invention is illustrated and described in connection with these embodiments, it should be understood that the invention is not limited to these embodiments. On the contrary, the invention is intended to cover alternatives, modifications and equivalents, which may be included within the spirit and scope of the invention as defined by the appended claims.

Furthermore, in the following detailed description, numerous specific details are set forth in order to provide a better understanding of the present invention. It will be understood by those skilled in the art that the present invention may be practiced without these specific details. In other instances, well-known methods, procedures, components and circuits have not been described in detail so as not to obscure the present invention.

Fig. 1 is a schematic diagram of a solder fume processing circuit 100 according to an embodiment of the present invention. The solder mist processing circuit 100 is used for intelligently absorbing the mist generated by the solder on the operation table. The solder mist processing circuit 100 includes a first switch unit 104, an infrared sensor 105, a controller 106, a light sensor 107, an air draft unit 108, and a second switch unit 111. The first switching unit 104 is coupled between the power supply unit 101 and the extraction unit 108, and the second switching unit 111 is coupled between the controller 106 and the extraction unit 108.

The power required by the infrared sensor 105, the controller 106, the light sensor 107 and the air extraction unit 108 is provided by the power supply unit 101. The power supply unit 101 may be a commercial power, or may be other power supplies such as a battery, as long as it can provide electric energy. Specifically, the power supply unit 101 is 220V ac.

The infrared sensor 105 detects a human body entering condition of the console within a first preset range, obtains a first sensing signal, and sends the first sensing signal to the controller 106. Specifically, after a human body enters a first preset range of the console, the infrared sensor 105 receives the infrared radiation signal due to the infrared radiation of the human body, so as to obtain a first sensing signal containing the infrared radiation signal, and sends the first sensing signal to the controller 106. When no human body enters the first preset range of the console, the infrared sensor 105 obtains a first sensing signal without an infrared radiation signal because no infrared radiation signal of the human body exists. The infrared sensor 105 may be a passive infrared sensor, an active infrared sensor, or another sensor capable of detecting a human body. The first preset range can be determined according to actual conditions. In addition, the number and the placement positions of the infrared sensors 105 can be determined according to actual conditions, so that whether a human body enters the first preset range of the operation table or not can be detected more accurately and sensitively.

The illumination sensor 107 detects the illumination intensity of the console within a second preset range to obtain a second sensing signal, and sends the second sensing signal to the controller 106. Specifically, when soldering is performed, the printed circuit board is placed above the probe of the illumination sensor 107, and since the printed circuit board blocks part of light, the illumination intensity value detected by the illumination sensor 107 is small, and then the second sensing signal including the small illumination intensity value is sent to the controller 106. After the printed circuit board is removed, the light is restored, the illumination intensity value detected by the illumination sensor 107 is significantly increased, and a second sensing signal containing the larger illumination intensity value is sent to the controller 106. The number and the placement positions of the light sensors 107 can be determined according to actual conditions, and the light intensity value can be obviously changed when the printed circuit board is taken away from the operating platform after the printed circuit board is soldered and soldered on the operating platform.

The controller 106 generates a first control signal according to the first sensing signal to control the on/off state of the first switch unit 104. Specifically, when the controller 106 determines that the first sensing signal includes the human body infrared radiation signal, a first state of the first control signal, i.e., a high level signal, is generated, so as to turn on the first switch unit 104. When the controller 106 determines that the first sensing signal does not include the human infrared radiation signal, a second state of the first control signal, i.e., a low level signal, is generated, so as to turn off the first switch unit 104.

The controller 106 further generates a second control signal according to the second sensing signal to control the on/off state of the second switch unit 111. Specifically, when the controller 106 determines that the illumination intensity value in the second sensing signal is lower than the preset value, the first state of the second control signal, i.e. the high level signal, is generated, so as to turn on the second switch unit 111. When the controller 106 determines that the illumination intensity value in the second sensing signal is not lower than the preset value, a second state of the second control signal, i.e. a low level signal, is generated, so as to turn off the second switch unit 111. Wherein the preset value can be determined according to actual conditions.

In this embodiment, the controller 106 is an Arduino control board, and the ports mainly used are VI port, a0 port, "2" port, GND port, "12" port, and "13" port. The VI port is connected to the power supply unit 101 and receives power supplied from the power supply unit 101. The a0 port is connected to the infrared sensor 105 and receives a first sensing signal transmitted by the infrared sensor 105. The port "12" is connected to the first switch unit 104, and generates a first control signal according to the first sensing signal to control the on/off of the first switch unit 104. Specifically, when the first sensing signal is determined to include the human infrared radiation signal, the port of the Arduino control board "12" generates the first state of the first control signal, i.e. the high level signal, to control the first switch unit 104 to be turned on. When the first sensing signal is judged not to contain the human body infrared radiation signal, the port of the Arduino control board '12' generates the second state of the first control signal, namely, a low level signal, and controls the first switch unit 104 to be switched off. The "2" port is connected to the illumination sensor 107 and receives a second sensing signal transmitted by the illumination sensor 107. The "13" port is connected to the second switch unit 111, and generates a second control signal according to the second sensing signal to control the on/off of the second switch unit 111. Specifically, when the illumination intensity value in the second sensing signal is determined to be lower than the preset value, the port of the Arduino control board "13" generates the first state of the second control signal, i.e. a high level signal, to control the second switch unit 111 to be turned on. When the illumination intensity value in the second sensing signal is lower than the preset value, the port of the Arduino control board "13" generates a second state of a second control signal, namely, a low level signal, and controls the second switch unit 111 to be switched off. The GND port is connected to ground.

The ventilation unit 108 is activated when both the first switching unit 104 and the second switching unit 111 are turned on. Specifically, only after the first switch unit 104 and the second switch unit 111 are both turned on, the ventilation unit 108 normally operates to absorb the smoke generated during soldering. Either one of the first switch unit 104 and the second switch unit 111 is turned off and the drafting unit 108 cannot operate. The ventilation unit 108 may be a fan, an air cleaner, or the like, as long as it can absorb the smoke generated by the solder.

This soldering tin smog processing circuit 100, can be when the human body gets into first predetermined scope, automatically, open first switch unit 104, when welding printed circuit board, printed circuit board shielding part light, lead to illumination intensity weak, thereby be less than the default, automatically, open second switch unit 111, thereby convulsions unit 108 begins to work, produced smog during the absorption soldering tin, harmful gas has been reduced to the harm of human body on the one hand, on the other hand automatic switch, the manpower has been liberated, the electric energy has also been saved.

In an embodiment, with continued reference to fig. 1, the solder fume processing circuit 100 further includes a voltage converter 103. The voltage converter 103 is coupled between the power supply unit 101 and the controller 106. The voltage converter 103 converts the voltage supplied from the power supply unit 101 into a voltage matched with the controller 106. The voltage converter 103 may be a boost converter or a buck converter, and may be determined according to the voltage provided by the power supply unit 101 and the voltage required by the controller 106. If power supply unit 101 is connected to voltage converter 103's input, the VI port of Arduino control panel is connected to the output, what power supply unit 101 provided is 12V's voltage, and what Arduino control panel needed is 5V voltage, chooses suitable type's buck converter can be with 12V voltage conversion to 5V voltage.

In one embodiment, referring to fig. 2, the first switch unit 104 includes a relay 201 and a first field effect transistor Q1. The coil of the relay 201 is coupled between the voltage converter 103 and the drain D of the first field effect transistor Q1, the contact set of the relay 201 is coupled between the power supply unit 101 and the air extracting unit 108, the gate G of the first field effect transistor Q1 is connected to the controller 106, and the source S of the first field effect transistor Q1 is grounded. Specifically, after the gate G of the first field effect transistor Q1 receives a high level signal sent from the "12" port of the Arduino control board, the gate G thereof is in a high level state, the first field effect transistor Q1 is turned on, and then the coil of the relay 201 connected thereto forms a closed loop, so that the contact set is turned on, and the power supply unit 101 is ready to supply power to the air extracting unit 108. After the grid G of the first field effect transistor Q1 receives a low level signal sent by the port of the Arduino control board "12", the grid G is in a low level state, the first field effect transistor Q1 cannot be conducted, no current passes through the coil of the relay 201 connected with the first field effect transistor Q1, the contact set cannot be conducted, and the power supply unit 101 does not provide electric energy for the air exhaust unit 108. In this embodiment, the first field effect transistor Q1 is an N-type field effect transistor, which is turned on when the gate G is at a high level and turned off when the gate G is at a low level. In other embodiments, the first field effect transistor Q1 may be a P-type field effect transistor.

In one embodiment, with continued reference to fig. 2, the second switch unit 111 includes a second field effect transistor Q2. The gate G of the second FET Q2 is connected to the controller 106, the drain D of the second FET Q2 is connected to the pumping unit 108, and the source S of the second FET Q2 is connected to ground. Specifically, the gate G of the second field effect transistor Q2 receives a high level signal transmitted from the Arduino control board "13" port, the gate G thereof is in a high level state, and the second field effect transistor Q2 is turned on. The gate G of the second fet Q2 receives a low signal from the Arduino control board "13" port, and the gate G thereof is at a low state, and the second fet Q2 is turned off. In this embodiment, the second field effect transistor Q2 is an N-type field effect transistor, which is turned on when the gate G is at a high level and turned off when the gate G is at a low level. In other embodiments, the second field effect transistor Q2 may be a P-type field effect transistor. In addition, a diode D1 can be connected in parallel at two ends of the ventilation unit 108, the anode of the diode D1 is connected with the output end of the ventilation unit 108, and the cathode of the diode D1 is connected with the input end of the ventilation unit 108. The diode D1 plays a role in stabilizing the current of the pumping unit 108 so as to prevent the drain D and the source S from being too high to burn out the second switching unit 111 at the instant when the second switching unit 111 is turned on/off.

In an embodiment, with continued reference to fig. 2, the solder fume processing circuit 100 further includes an illumination unit 109. The lighting unit 109 is coupled in parallel with the extraction unit 108. The illumination unit 109 is used to illuminate the console. When a worker welds the printed circuit board 100 on the operation table, the illumination unit 109 provides illumination to prevent the indoor environment from being too dark and affecting the welding operation. The lighting unit 109 may be an LED lamp, or other devices capable of providing illumination. In the present embodiment, the lighting unit 109 is formed by connecting 3 LED lamps in series, one end of which is connected to the contact group of the relay 201, and the other end of which is connected to the drain D of the second field effect transistor Q2.

In an embodiment, with continued reference to fig. 2, the solder fume processing circuit 100 further includes a regulating unit 110. The adjusting unit 110 is coupled in series with the lighting unit 109. The adjusting unit 110 adjusts the brightness of the illumination unit 109. In an embodiment, the adjusting unit 110 may be an adjustable resistor VR. In another embodiment, the adjusting unit 110 may also be a switch mode converter. In this embodiment, the adjusting unit 110 is an adjustable resistor VR, one end of the adjustable resistor VR is connected to the LED lamp, and the other end of the adjustable resistor VR is connected to the drain D of the second field effect transistor Q2. Through adjusting adjustable resistor VR's resistance to change the voltage that lighting unit 109 divides, and then change lighting unit 109's luminance, make the staff can adjust lighting unit 109's luminance as required, it is more intelligent.

In an embodiment, with continued reference to fig. 1 and 2, the solder fume processing circuit 100 further includes a power adapter 102. The power adapter 102 is coupled between the power supply unit 101 and the first switching unit 104. The power adapter 102 converts an ac input of the power supply unit 101 into a dc output. Specifically, when the power supply unit 101 is ac power, the power adapter 102 may convert the ac power into dc power for output. In the present embodiment, the power adapter 102 is a 12V power adapter, and converts 220V ac power supplied by the power unit 101 into 12V dc power.

Fig. 3 is a flow chart of a solder fume handling method 300 according to an embodiment of the invention. Fig. 3 will be described in conjunction with fig. 2. A method 300 of performing solder fume processing using the solder fume processing circuit 100 of any of the above embodiments, the method 300 comprising:

in step 310, the infrared sensor 105 detects that a human body enters the console within a first preset range, obtains a first sensing signal, and sends the first sensing signal to the controller 106. Specifically, when the infrared sensor 105 detects that a human body enters the operating console within a first preset range, a first sensing signal including a human body infrared radiation signal is sent to the controller 106. In addition, when the infrared sensor 105 detects that no human body enters the first preset range of the console, the first sensing signal which does not contain the human body infrared radiation signal is sent to the controller 106. The first preset range can be set according to actual conditions.

In step 320, when the controller 106 determines that there is a human body signal in the first sensing signal, it controls the first switch unit 104 to be turned on. Specifically, when the controller 106 determines that the first sensing signal includes the human body infrared radiation signal, a first state of the first control signal, i.e., a high level signal, is generated, so as to turn on the first switch unit 104. In addition, when the controller 106 determines that the first sensing signal does not include the human body infrared radiation signal, the second state of the first control signal, i.e. the low level signal, is generated, so as to turn off the first switch unit 104.

In step 330, the illumination sensor 107 detects the illumination intensity of the console within a second preset range to obtain a second sensing signal, and sends the second sensing signal to the controller 106. Specifically, the illumination sensor 107 detects an illumination intensity value within a second predetermined range of the console, and transmits a second sensing signal containing the illumination intensity value to the controller 106. The second preset range can be set according to actual conditions.

In step 340, after the controller 106 determines that the second sensing signal is lower than the preset value, the second switch unit 111 is controlled to be turned on, and the ventilation unit 108 is started. Specifically, when the controller 106 determines that the illumination intensity value in the second sensing signal is lower than the preset value, the first state of the second control signal, i.e. the high level signal, is generated, so that the second switch unit 111 is turned on, and at this time, the air draft unit 108 is started to absorb the smoke generated during the soldering. In addition, after the controller 106 determines that the illumination intensity value in the second sensing signal is not lower than the preset value, a second state of the second control signal, i.e. a low level signal, is generated, so that the second switch unit 111 is turned off, and the air draft unit 108 does not work.

The solder fume processing method 300 depends on the solder fume processing circuit in any of the above embodiments, and the description of the method is consistent with the description of the above circuit, and is not repeated here.

The foregoing detailed description and drawings are merely representative of the general embodiments of the invention. It will be apparent that various additions, modifications and substitutions are possible without departing from the spirit and scope of the invention as defined in the accompanying claims. It will be appreciated by those skilled in the art that the present invention may be varied in form, structure, arrangement, proportions, materials, elements, components and otherwise, used in the practice of the invention, depending upon specific environments and operating requirements, without departing from the principles of the present invention. Accordingly, the presently disclosed embodiments are meant to be illustrative only and not limiting, the scope of the invention being defined by the appended claims and their legal equivalents, rather than by the foregoing description.

Claims

1. A soldering tin smog processing circuit is used for intelligently absorbing smog generated by soldering tin on an operation table and is characterized by comprising a first switch unit, a second switch unit, an air draft unit, a controller, an infrared sensor and an illumination sensor; the first switch unit is coupled between a power supply unit and the air draft unit, and the second switch unit is coupled between the controller and the air draft unit;

the electric energy required by the air draft unit, the controller, the infrared sensor and the illumination sensor is provided by the power supply unit; the infrared sensor is used for detecting the human body entering condition of the operating platform within a first preset range to obtain a first induction signal and sending the first induction signal to the controller; the illumination sensor is used for detecting the illumination intensity of the operating platform within a second preset range to obtain a second induction signal, and sending the second induction signal to the controller; the controller is used for generating a first control signal according to the first induction signal so as to control the on/off state of the first switch unit; the second switch unit is used for generating a second sensing signal according to the first sensing signal and the second sensing signal; the air draft unit is used for starting when the first switch unit and the second switch unit are both conducted,

when the printed circuit board shields part of light rays during soldering, the second sensing signal is lower than a preset value, and the controller controls the second switch unit to be switched on.

2. The solder fume processing circuit according to claim 1, wherein when the controller determines that there is a human body signal in the first sensing signal, a first state of the first control signal is generated to control the first switch unit to be turned on; when the controller judges that no human body signal exists in the first induction signal, a second state of the first control signal is generated to control the first switch unit to be switched off.

3. The solder fume processing circuit according to claim 1, wherein when the controller determines that the second sensing signal is lower than a preset value, a first state of the second control signal is generated to control the second switch unit to be turned on; and when the controller judges that the second sensing signal is not lower than the preset value, generating a second state of the second control signal to control the second switch unit to be switched off.

4. The solder fume processing circuit according to claim 1, wherein the circuit comprises a voltage converter; the voltage converter is coupled between the power supply unit and the controller; the voltage converter is used for converting the voltage provided by the power supply unit into a voltage matched with the controller.

5. The solder mist handling circuit according to claim 4, wherein the first switching unit includes a relay and a first field effect transistor; the coil of the relay is coupled between the voltage converter and the drain electrode of the first field effect transistor, the contact group of the relay is coupled between the power supply unit and the air draft unit, the grid electrode of the first field effect transistor is connected with the controller, and the source electrode of the first field effect transistor is grounded.

6. The solder mist handling circuit according to claim 1, wherein the second switching unit includes a second field effect transistor; the grid electrode of the second field effect transistor is connected with the controller, the drain electrode of the second field effect transistor is connected with the air exhaust unit, and the source electrode of the second field effect transistor is grounded.

7. The solder fume handling circuit of claim 1, wherein the circuit further comprises a lighting unit; the lighting unit is coupled with the air draft unit in parallel; the lighting unit is used for lighting the operation table.

8. The solder fume handling circuit of claim 7, further comprising a conditioning unit; the conditioning unit is coupled in series with the lighting unit; the adjusting unit is used for adjusting the brightness of the lighting unit.

9. The solder fume processing circuit of claim 1, wherein the circuit further comprises a power adapter; the power adapter is coupled between the power supply unit and the first switching unit; the power adapter is used for converting alternating current input of the power supply unit into direct current output.

10. A solder fume processing method for performing solder fume processing using the solder fume processing circuit according to any one of claims 1 to 9, the method comprising:

the infrared sensor detects the human body entering condition in a first preset range of the operating platform to obtain a first induction signal, and the first induction signal is sent to the controller;

when the controller judges that a human body signal exists in the first induction signal, the controller controls the first switch unit to be conducted;

the illumination sensor detects illumination intensity of the operating platform within a second preset range to obtain a second induction signal, and the second induction signal is sent to the controller; and

when the controller judges that the second induction signal is lower than a preset value, the controller controls the second switch unit to be conducted, the air draft unit is started,

when the printed circuit board is subjected to soldering, the second sensing signal is lower than the preset value under the condition that the printed circuit board shields part of light rays.