CN113464413B - Alcohol flow controller - Google Patents
Alcohol flow controller Download PDFInfo
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- CN113464413B CN113464413B CN202110797619.XA CN202110797619A CN113464413B CN 113464413 B CN113464413 B CN 113464413B CN 202110797619 A CN202110797619 A CN 202110797619A CN 113464413 B CN113464413 B CN 113464413B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
- F04B49/06—Control using electricity
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
Abstract
The invention discloses an alcohol flow controller, which comprises a power supply circuit, a Venturi bridge oscillation circuit, a bias voltage generation circuit, a square wave generation circuit, an adjustable resistor, a comparison modulation circuit and an electronic switch, wherein the power supply circuit is connected with the Venturi bridge oscillation circuit; the power supply circuit is respectively connected with the Venturi bridge oscillating circuit, the bias voltage generating circuit, the square wave generating circuit and the electronic switch; the bias voltage generating circuit is connected with the Venturi bridge oscillating circuit; the comparison modulation circuit is respectively connected with the Venturi bridge oscillation circuit and the electronic switch; the square wave generating circuit is connected with the electronic switch; the electronic switch is connected with the alcohol pump. According to the alcohol flow controller provided by the invention, the PWM control signal with the adjustable duty ratio is generated in a pure hardware mode, and the electronic switch is used for controlling the alcohol pump to work, so that the alcohol flow can be accurately controlled, and the alcohol flow controller has the advantages of simple structure and low cost, and is suitable for wide popularization and application.
Description
Technical Field
The invention relates to the technical field of flow control, in particular to an alcohol flow controller.
Background
In the SMT (surface mount technology) process, alcohol is periodically pumped onto the board for cleaning, as required for cleaning the board. As is known, if the flow rate of the alcohol pump is too fast, the alcohol on the plate is too much, so that the alcohol is wasted, and serious potential safety hazards can be formed by the fact that the alcohol overflows out of the machine; otherwise, if the flow of the alcohol pump is too small, the alcohol on the plate is too small to clean the plate, and the subsequent process of the production line is influenced.
In the prior art, in order to make the flow rate of alcohol controllable, there are two general flow control schemes: the first is to directly adjust the supply voltage of the alcohol pump, and the second is to control the rotation speed of the alcohol pump through the MCU control unit. However, the first solution is simple and direct, but because the adjustable power supply needs to be configured, and the power supply of the general equipment is fixed 24V direct current, the adjustable power supply cannot be configured, the implementation is difficult, and the control mode is too low in accuracy. The second scheme is flexible in control, various in control mode and compatible with various alcohol pumps, but is high in scheme complexity, needs to work together with software and hardware, is high in material cost, and is not beneficial to overall cost control of equipment.
Therefore, it would be desirable to provide a new alcohol flow control technique that overcomes the shortcomings of the prior art.
The above information is presented as background information only to aid in the understanding of the present disclosure and is not intended or admitted to be prior art relative to the present disclosure.
Disclosure of Invention
The invention provides an alcohol flow controller to solve the defects in the prior art.
In order to achieve the above object, the present invention provides the following technical solutions:
an alcohol flow controller comprises a power supply circuit, a Venturi bridge oscillation circuit, a bias voltage generation circuit, a square wave generation circuit, an adjustable resistor, a comparison modulation circuit and an electronic switch; wherein, the liquid crystal display device comprises a liquid crystal display device,
the power supply circuit is respectively connected with the Venturi bridge oscillating circuit, the bias voltage generating circuit, the square wave generating circuit and the electronic switch;
the bias voltage generating circuit is connected with the Venturi bridge oscillating circuit;
the comparison modulation circuit is respectively connected with the Venturi bridge oscillation circuit and the electronic switch;
the square wave generating circuit is connected with the electronic switch;
the electronic switch is connected with the alcohol pump.
Further, in the alcohol flow controller, the electronic switch is a MOS transistor Q1.
Further, in the alcohol flow controller, the power supply circuit includes a power input end, a power output end, a linear power converter U4, a ninth filter capacitor C9, a twelfth filter capacitor C12, a tenth filter capacitor C10, an eleventh filter capacitor C11, and a fifth interface P5;
one end of the ninth filter capacitor C9 and the twelfth filter capacitor C12 after being connected IN parallel are respectively connected with the power input end, the IN end of the linear power converter U4 and the fifth interface P5, and the other end is respectively connected with the fifth interface P5 and GND;
one end of the tenth filter capacitor C10 and one end of the eleventh filter capacitor C11 which are connected in parallel are respectively connected with the power output end and the OUT end of the linear power converter U4, and the other end of the tenth filter capacitor C10 is connected with GND;
the GND terminal GND of the linear power converter U4.
Further, in the alcohol flow controller, the square wave generating circuit comprises a 555 timer U5, a seventh interface P7, a sixth resistor R6, an eighth resistor R8, a seventh diode D7, a ninth diode D9 and a seventeenth capacitor C17;
one end of the seventh interface P7 is connected with the adjustable resistor, and the other end is respectively connected with one end of the sixth resistor R6, one end of the eighth resistor R8 and the anode of the seventh diode D7;
the other end of the sixth resistor R6 is connected with the RST end of the 555 timer U5;
the other end of the eighth resistor R8 is connected with the cathode of the ninth diode D9;
the positive electrode of the ninth diode D9 is connected with the seventeenth capacitor C17 and then connected with GND;
the negative electrode of the seventh diode D7 is connected with the seventeenth capacitor C17 and then connected with GND;
the RST end and the VCC end of the 555 timer U5 are respectively connected with the power supply output end;
the DIS end of the 555 timer U5 is connected with the anode of the seventh diode D7;
the THR end and the TRI end of the 555 timer U5 are respectively connected with the cathode of the seventh diode D7;
the CON end of the 555 timer U5 is connected with GND through a sixteenth capacitor;
GND of the 555 timer U5 is connected with GND;
the OUT terminal of the 555 timer U5 is connected to the twelfth interface P12.
Further, in the alcohol flow controller, the gate of the MOS transistor Q1 is connected to the twelfth interface P12 through a seventh resistor R7;
the drain electrode of the MOS tube Q1 is connected with a sixth interface P6;
the source electrode of the MOS tube Q1 is connected with GND;
a fifteenth capacitor C15 is connected in parallel with two ends of the seventh resistor R7;
an eighth diode D8 and a ninth resistor R9 are connected in series between the grid electrode of the MOS tube Q1 and GND;
the grid electrode of the MOS tube Q1 is connected with the emitter electrode of the NPN triode Q2;
the base electrode of the NPN triode Q2 is connected between the seventh resistor R7 and the twelfth interface P12 through a tenth resistor R10;
the collector electrode of the NPN triode Q2 is grounded;
the sixth interface P6 is connected with the power input end;
the two ends of the sixth interface P6 are connected in parallel with a sixth diode D6, an anode of the sixth diode D6 is connected with the drain electrode of the MOS transistor Q1, and a cathode of the sixth diode D6 is connected with the power input end.
Further, in the alcohol flow controller, the bias voltage generating circuit includes a first operational amplifier U8A, a seventeenth resistor R17, a twenty-second capacitor C22, and a twenty-fourth resistor R24;
one end of the seventeenth resistor R17 is connected with the power supply output end, and the other end of the seventeenth resistor R17 is connected with one end of the twenty-fourth resistor R24; the other end of the twenty-fourth resistor R24 is grounded;
the twenty-second capacitor C22 is connected in parallel to two ends of the twenty-fourth resistor R24;
the non-inverting input end of the first operational amplifier U8A is connected between the seventeenth resistor R17 and the twenty-fourth resistor R24;
the inverting input terminal of the first operational amplifier U8A is connected with the output terminal of the first operational amplifier U8A.
Further, in the alcohol flow controller, the venturi bridge oscillating circuit includes an eighteenth capacitor C18, an eleventh resistor R11, a nineteenth capacitor C19, a fifteenth resistor R15, a twenty-second resistor R22, an eighteenth resistor R18, a twenty-first resistor R21, a twelfth diode D10, an eleventh diode D11, and a second operational amplifier U6A;
one end of the nineteenth capacitor C19 is connected with the fifteenth resistor R15 in parallel, and then the other end of the nineteenth capacitor C19 is connected with the non-inverting input end of the second operational amplifier U6A, and the other end of the nineteenth capacitor C is connected with the output end of the first operational amplifier U8A;
the twenty-second resistor R22 is connected between the inverting input end of the second operational amplifier U6A and the output end of the first operational amplifier U8A;
the eighteenth resistor R18 is connected between the inverting input terminal of the second operational amplifier U6A and the output terminal of the second operational amplifier U6A;
one end of the twenty-first resistor R21 is connected with the inverting input end of the second operational amplifier U6A, and the other end of the twenty-first resistor R is connected with the negative electrode of the twelfth polar tube D10; the positive electrode of the twelfth electrode tube D10 is connected with the output end of the second operational amplifier U6A;
the positive electrode of the eleventh diode D11 is connected to the negative electrode of the twelfth diode D10, and the negative electrode of the eleventh diode D11 is connected to the positive electrode of the twelfth diode D10;
one end of the eighteenth capacitor C18 is connected to the non-inverting input end of the second operational amplifier U6A, and the other end is connected to one end of the eleventh resistor R11;
the other end of the eleventh resistor R11 is connected to the output end of the second operational amplifier U6A.
Further, in the alcohol flow controller, the comparison modulation circuit includes an eighth interface P8, a twelfth resistor R12, a thirteenth resistor R13, a twentieth capacitor C20, a nineteenth resistor R19, a twentieth resistor R20, a third operational amplifier U6B, a fourteenth resistor R14, a comparator U7A, a sixteenth resistor R16, a tenth interface P10, a twenty-fifth resistor R25, a twenty-first capacitor C21, a voltage follower U8B, a thirty-fifth resistor R35, a ninth interface P9, and a twenty-third resistor R23;
the eighth interface P8 is connected to the output end of the second operational amplifier U6A and one end of the twelfth resistor R12, respectively; the other end of the twelfth resistor R12 is connected with GND;
one end of the thirteenth resistor R13 is connected between the twelfth resistor R12 and the eighth interface P8, and the other end is connected with the non-inverting input end of the third operational amplifier U6B;
one end of the nineteenth resistor R19 is connected with the inverting input end of the third operational amplifier U6B, and the other end is connected with GND;
one end of the twentieth capacitor C20 is connected between the thirteenth resistor R13 and the non-inverting input terminal of the third operational amplifier U6B, and the other end is connected between the nineteenth resistor R19 and GND;
one end of the twentieth resistor R20 is connected between the nineteenth resistor R19 and the inverting input end of the third operational amplifier U6B, and the other end of the twentieth resistor R20 is connected with the output end of the third operational amplifier U6B;
one end of the fourteenth resistor R14 is connected with the output end of the third operational amplifier U6B, and the other end of the fourteenth resistor R is connected with the non-inverting input end of the comparator U7A;
one end of the sixteenth resistor R16 is connected with the V+ end of the comparator U7A, and the other end of the sixteenth resistor R16 is connected with the output end of the comparator U7A;
the output end of the comparator U7A is connected with a twelfth interface P12;
one end of the thirty-fifth resistor R35 is connected with the inverting input end of the comparator U7A, and the other end of the thirty-fifth resistor R35 is connected with the output end of the voltage follower U8B;
the inverting input end of the voltage follower U8B is connected with the output end of the voltage follower U8B;
one end of the twenty-fifth resistor R25 is connected with the non-inverting input end of the voltage follower U8B, and the other end of the twenty-fifth resistor R is connected with the tenth interface P10;
one end of the twenty-first capacitor C21 is connected with the non-inverting input end of the voltage follower U8B, and the other end of the twenty-first capacitor C is connected with GND;
the tenth interface P10 is connected to the ninth interface P9;
one end of the twenty-third resistor R23 is connected with the power output end, and the other end of the twenty-third resistor R is connected with the ninth interface P9;
the ninth interface P9 and the tenth interface P10 are both connected to GND.
Further, the alcohol flow controller further comprises a twenty-third capacitor C23 and a twenty-fourth capacitor C24;
and one end of the twenty-third capacitor C23 and one end of the twenty-fourth capacitor C24 are connected in parallel and then are connected with the power output end, and the other end of the twenty-third capacitor C23 and the twenty-fourth capacitor C24 are connected with GND.
Further, the alcohol flow controller further includes a thirteenth capacitor C13 and a fourteenth capacitor C14;
one end of the thirteenth capacitor C13 and the fourteenth capacitor C14 which are connected in parallel is connected with the power supply output end, and the other end of the thirteenth capacitor C13 is connected with the GND.
According to the alcohol flow controller provided by the embodiment of the invention, the PWM control signal with the adjustable duty ratio is generated in a pure hardware mode, and the electronic switch is used for controlling the operation of the alcohol pump, so that the alcohol flow can be accurately controlled, and the alcohol flow controller has the advantages of simple structure and low cost, and is suitable for wide popularization and application.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions of the prior art, the drawings which are used in the description of the embodiments or the prior art will be briefly described, it being obvious that the drawings in the description below are only some embodiments of the invention, and that other drawings can be obtained from these drawings without inventive faculty for a person skilled in the art.
FIG. 1 is a schematic diagram of a functional block of an alcohol flow controller according to an embodiment of the present invention;
FIG. 2 is a schematic circuit diagram of a power supply circuit according to a first embodiment of the present invention;
FIG. 3 is a schematic circuit diagram of a square wave generator circuit according to a first embodiment of the present invention;
fig. 4 is a schematic circuit diagram of a bias voltage generating circuit, a venturi bridge oscillating circuit and a comparison modulating circuit according to a first embodiment of the present invention.
Detailed Description
In order to make the objects, features and advantages of the present invention more obvious and understandable, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is apparent that the embodiments described below are only some embodiments of the present invention, not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In the description of the present invention, it will be understood that when one component is referred to as being "connected" to another component, it can be directly connected to the other component or intervening components may also be present. When an element is referred to as being "disposed on" another element, it can be directly on the other element or intervening elements may also be present.
Furthermore, the terms "long," "short," "inner," "outer," and the like, as used herein, refer to an orientation or positional relationship based on that shown in the drawings, for convenience of description of the present invention, and are not intended to indicate or imply that the apparatus or elements referred to must have this particular orientation, operate in a particular orientation configuration, and thus should not be construed as limiting the invention.
The technical scheme of the invention is further described below by the specific embodiments with reference to the accompanying drawings.
Example 1
In view of the above-mentioned drawbacks of the prior art, the applicant has actively studied and innovated based on practical experience and expertise which are rich for years in designing and manufacturing products in the industry, and in combination with application of the theory, to hope to create a technology capable of solving the drawbacks of the prior art, so that the alcohol flow control technology has more practicability. After continuous research and design and repeated sample test and improvement, the invention with practical value is finally created.
Referring to fig. 1, an embodiment of the present invention provides an alcohol flow controller, which includes a power supply circuit, a venturi bridge oscillating circuit, a bias voltage generating circuit, a square wave generating circuit, an adjustable resistor, a comparison modulating circuit and an electronic switch; wherein, the liquid crystal display device comprises a liquid crystal display device,
the power supply circuit is respectively connected with the Venturi bridge oscillating circuit, the bias voltage generating circuit, the square wave generating circuit and the electronic switch;
the bias voltage generating circuit is connected with the Venturi bridge oscillating circuit;
the comparison modulation circuit is respectively connected with the Venturi bridge oscillation circuit and the electronic switch;
the square wave generating circuit is connected with the electronic switch;
the electronic switch is connected with the alcohol pump.
In this embodiment, the electronic switch is a MOS transistor Q1.
Referring to fig. 2, the power supply circuit includes a power input terminal, a power output terminal, a linear power converter U4, a ninth filter capacitor C9, a twelfth filter capacitor C12, a tenth filter capacitor C10, an eleventh filter capacitor C11, and a fifth interface P5;
one end of the ninth filter capacitor C9 and the twelfth filter capacitor C12 after being connected IN parallel are respectively connected with the power input end, the IN end of the linear power converter U4 and the fifth interface P5, and the other end is respectively connected with the fifth interface P5 and GND;
one end of the tenth filter capacitor C10 and one end of the eleventh filter capacitor C11 which are connected in parallel are respectively connected with the power output end and the OUT end of the linear power converter U4, and the other end of the tenth filter capacitor C10 is connected with GND;
the GND terminal GND of the linear power converter U4.
The ninth filter capacitor C9 and the twelfth filter capacitor C12 are used as input filter capacitors, the tenth filter capacitor C10 and the eleventh filter capacitor C11 are used as output filter capacitors, and the five elements of the linear power converter U4, the ninth filter capacitor C9, the twelfth filter capacitor C12, the tenth filter capacitor C10, and the eleventh filter capacitor C11 change the power of 24V input from the power input terminal to 12V and output from the power output terminal for supplying power to other subsequent circuits.
Referring to fig. 3, in the present embodiment, the square wave generating circuit includes a 555 timer U5, a seventh interface P7, a sixth resistor R6, an eighth resistor R8, a seventh diode D7, a ninth diode D9, and a seventeenth capacitor C17;
one end of the seventh interface P7 is connected with the adjustable resistor, and the other end is respectively connected with one end of the sixth resistor R6, one end of the eighth resistor R8 and the anode of the seventh diode D7;
the other end of the sixth resistor R6 is connected with the RST end of the 555 timer U5;
the other end of the eighth resistor R8 is connected with the cathode of the ninth diode D9;
the positive electrode of the ninth diode D9 is connected with the seventeenth capacitor C17 and then connected with GND;
the negative electrode of the seventh diode D7 is connected with the seventeenth capacitor C17 and then connected with GND;
the RST end and the VCC end of the 555 timer U5 are respectively connected with the power supply output end;
the DIS end of the 555 timer U5 is connected with the anode of the seventh diode D7;
the THR end and the TRI end of the 555 timer U5 are respectively connected with the cathode of the seventh diode D7;
the CON end of the 555 timer U5 is connected with GND through a sixteenth capacitor;
GND of the 555 timer U5 is connected with GND;
the OUT terminal of the 555 timer U5 is connected to the twelfth interface P12.
It should be noted that, the 555 timer U5 is a 555 timer with a model LM 555. The seventh interface P7 is used as an external interface of the adjustable resistor, the 555 timer U5, the seventh interface P7, the sixth resistor R6, the eighth resistor R8, the seventh diode D7, the ninth diode D9 and the seventeenth capacitor C17 together form an RC charging and discharging circuit, the charging and discharging parts are separated by diodes and do not interfere with each other, the charging and discharging circuit can generate a path of PWM signal after being modulated inside the 555 timer U5, and the signal duty ratio is adjusted by the adjustable resistor externally connected with the seventh interface P7.
Referring to fig. 3, in the present embodiment, a gate of the MOS transistor Q1 is connected to the twelfth interface P12 through a seventh resistor R7;
the drain electrode of the MOS tube Q1 is connected with a sixth interface P6;
the source electrode of the MOS tube Q1 is connected with GND;
a fifteenth capacitor C15 is connected in parallel with two ends of the seventh resistor R7;
an eighth diode D8 and a ninth resistor R9 are connected in series between the grid electrode of the MOS tube Q1 and GND;
the grid electrode of the MOS tube Q1 is connected with the emitter electrode of the NPN triode Q2;
the base electrode of the NPN triode Q2 is connected between the seventh resistor R7 and the twelfth interface P12 through a tenth resistor R10;
the collector electrode of the NPN triode Q2 is grounded;
the sixth interface P6 is connected with the power input end;
the two ends of the sixth interface P6 are connected in parallel with a sixth diode D6, an anode of the sixth diode D6 is connected with the drain electrode of the MOS transistor Q1, and a cathode of the sixth diode D6 is connected with the power input end.
Note that, the MOS transistor Q1 is used as an electronic switching transistor, and the fifteenth capacitor C15, the seventh resistor R7, the tenth resistor R10, and the NPN transistor Q2 are used to accelerate the switching operation. The eighth diode D8 and the ninth resistor R are used for protecting the MOS transistor Q1, so as to prevent the MOS transistor Q1 from being burned due to too high voltage.
Referring to fig. 4, in the present embodiment, the bias voltage generating circuit includes a first operational amplifier U8A, a seventeenth resistor R17, a twenty-second capacitor C22, and a twenty-fourth resistor R24;
one end of the seventeenth resistor R17 is connected with the power supply output end, and the other end of the seventeenth resistor R17 is connected with one end of the twenty-fourth resistor R24; the other end of the twenty-fourth resistor R24 is grounded;
the twenty-second capacitor C22 is connected in parallel to two ends of the twenty-fourth resistor R24;
the non-inverting input end of the first operational amplifier U8A is connected between the seventeenth resistor R17 and the twenty-fourth resistor R24;
the inverting input terminal of the first operational amplifier U8A is connected with the output terminal of the first operational amplifier U8A.
It should be noted that, the four elements of the first operational amplifier U8A, the seventeenth resistor R17, the twenty-second capacitor C22, and the twenty-fourth resistor R24 divide the power supply to generate a 1.5V reference voltage. The reference voltage is used for biasing the venturi bridge oscillating circuit so that the venturi bridge oscillating circuit can work under a single power supply circuit.
Referring to fig. 4, in the present embodiment, the venturi bridge oscillating circuit includes an eighteenth capacitor C18, an eleventh resistor R11, a nineteenth capacitor C19, a fifteenth resistor R15, a twenty-second resistor R22, an eighteenth resistor R18, a twenty-first resistor R21, a twelfth diode D10, an eleventh diode D11, and a second operational amplifier U6A;
one end of the nineteenth capacitor C19 is connected with the fifteenth resistor R15 in parallel, and then the other end of the nineteenth capacitor C19 is connected with the non-inverting input end of the second operational amplifier U6A, and the other end of the nineteenth capacitor C is connected with the output end of the first operational amplifier U8A;
the twenty-second resistor R22 is connected between the inverting input end of the second operational amplifier U6A and the output end of the first operational amplifier U8A;
the eighteenth resistor R18 is connected between the inverting input terminal of the second operational amplifier U6A and the output terminal of the second operational amplifier U6A;
one end of the twenty-first resistor R21 is connected with the inverting input end of the second operational amplifier U6A, and the other end of the twenty-first resistor R is connected with the negative electrode of the twelfth polar tube D10; the positive electrode of the twelfth electrode tube D10 is connected with the output end of the second operational amplifier U6A;
the positive electrode of the eleventh diode D11 is connected to the negative electrode of the twelfth diode D10, and the negative electrode of the eleventh diode D11 is connected to the positive electrode of the twelfth diode D10;
one end of the eighteenth capacitor C18 is connected to the non-inverting input end of the second operational amplifier U6A, and the other end is connected to one end of the eleventh resistor R11;
the other end of the eleventh resistor R11 is connected to the output end of the second operational amplifier U6A.
The venturi bridge oscillating circuit composed of the eighteenth capacitor C18, the eleventh resistor R11, the nineteenth capacitor C19, the fifteenth resistor R15, the twenty second resistor R22, the eighteenth resistor R18, the twenty first resistor R21, the twelfth diode D10, the eleventh diode D11 and the second operational amplifier U6A charges and discharges through the capacitor and resistor elements of the components thereof, thereby causing oscillation and finally generating a stable sine wave signal.
Referring to fig. 4, in the present embodiment, the comparison modulation circuit includes an eighth interface P8, a twelfth resistor R12, a thirteenth resistor R13, a twentieth capacitor C20, a nineteenth resistor R19, a twentieth resistor R20, a third operational amplifier U6B, a fourteenth resistor R14, a comparator U7A, a sixteenth resistor R16, a tenth interface P10, a twenty-fifth resistor R25, a twenty-first capacitor C21, a voltage follower U8B, a thirty-fifth resistor R35, a ninth interface P9, and a twenty-third resistor R23;
the eighth interface P8 is connected to the output end of the second operational amplifier U6A and one end of the twelfth resistor R12, respectively; the other end of the twelfth resistor R12 is connected with GND;
one end of the thirteenth resistor R13 is connected between the twelfth resistor R12 and the eighth interface P8, and the other end is connected with the non-inverting input end of the third operational amplifier U6B;
one end of the nineteenth resistor R19 is connected with the inverting input end of the third operational amplifier U6B, and the other end is connected with GND;
one end of the twentieth capacitor C20 is connected between the thirteenth resistor R13 and the non-inverting input terminal of the third operational amplifier U6B, and the other end is connected between the nineteenth resistor R19 and GND;
one end of the twentieth resistor R20 is connected between the nineteenth resistor R19 and the inverting input end of the third operational amplifier U6B, and the other end of the twentieth resistor R20 is connected with the output end of the third operational amplifier U6B;
one end of the fourteenth resistor R14 is connected with the output end of the third operational amplifier U6B, and the other end of the fourteenth resistor R is connected with the non-inverting input end of the comparator U7A;
one end of the sixteenth resistor R16 is connected with the V+ end of the comparator U7A, and the other end of the sixteenth resistor R16 is connected with the output end of the comparator U7A;
the output end of the comparator U7A is connected with a twelfth interface P12;
one end of the thirty-fifth resistor R35 is connected with the inverting input end of the comparator U7A, and the other end of the thirty-fifth resistor R35 is connected with the output end of the voltage follower U8B;
the inverting input end of the voltage follower U8B is connected with the output end of the voltage follower U8B;
one end of the twenty-fifth resistor R25 is connected with the non-inverting input end of the voltage follower U8B, and the other end of the twenty-fifth resistor R is connected with the tenth interface P10;
one end of the twenty-first capacitor C21 is connected with the non-inverting input end of the voltage follower U8B, and the other end of the twenty-first capacitor C is connected with GND;
the tenth interface P10 is connected to the ninth interface P9;
one end of the twenty-third resistor R23 is connected with the power output end, and the other end of the twenty-third resistor R is connected with the ninth interface P9;
the ninth interface P9 and the tenth interface P10 are both connected to GND.
It should be noted that, the sine wave signal generated by the venturi bridge oscillating circuit enters the amplifying circuit after passing through the eighth interface P8 jumper. The thirteenth resistor R13 and the twentieth capacitor C20 form a low-pass filter for eliminating other clutter generated by the Venturi bridge oscillation circuit, the nineteenth resistor R19, the twentieth resistor R20 and the third operational amplifier U6B form a signal amplifier, the sine wave is amplified by 2 times and then is sent into the comparator U7A through the fourteenth resistor R14, the tenth interface P10 can be connected with an external analog quantity, the voltage follower U8B enters the comparator U7A after the twenty fifth resistor R25 and the twenty first capacitor C21 are subjected to low-pass filtering. In the comparator U7A, the sine wave from the venturi bridge oscillation circuit is compared with the voltage signal from the external analog quantity and output, thereby achieving the PWM modulation effect. The modulated signal is also outputted through the MOS transistor Q1.
Referring to fig. 4, in the present embodiment, the alcohol flow controller further includes a twenty-third capacitor C23 and a twenty-fourth capacitor C24;
and one end of the twenty-third capacitor C23 and one end of the twenty-fourth capacitor C24 are connected in parallel and then are connected with the power output end, and the other end of the twenty-third capacitor C23 and the twenty-fourth capacitor C24 are connected with GND.
Referring to fig. 3, in the present embodiment, the alcohol flow controller further includes a thirteenth capacitor C13 and a fourteenth capacitor C14;
one end of the thirteenth capacitor C13 and the fourteenth capacitor C14 which are connected in parallel is connected with the power supply output end, and the other end of the thirteenth capacitor C13 is connected with the GND.
According to the alcohol flow controller provided by the embodiment of the invention, the PWM control signal with the adjustable duty ratio is generated in a pure hardware mode, and the electronic switch is used for controlling the operation of the alcohol pump, so that the alcohol flow can be accurately controlled, and the alcohol flow controller has the advantages of simple structure and low cost, and is suitable for wide popularization and application.
The description of the foregoing embodiments has been provided for the purposes of illustration and description. It is not intended to be exhaustive or to limit the disclosure. Individual elements or features of a particular embodiment are generally not limited to the particular embodiment, but, where applicable, may be interchanged and used with the selected embodiment even if not specifically shown or described. The same elements or features may also be varied in many ways. Such variations are not to be regarded as a departure from the disclosure, and all such modifications are intended to be included within the scope of the disclosure.
Example embodiments are provided so that this disclosure will be thorough, and will fully convey the scope to those skilled in the art. Numerous details are set forth, such as examples of specific parts, devices, and methods, in order to provide a thorough understanding of embodiments of the present disclosure. It will be apparent to one skilled in the art that the exemplary embodiments may be embodied in many different forms without the use of specific details, and neither should be construed to limit the scope of the disclosure. In certain example embodiments, well-known processes, well-known device structures, and well-known techniques are not described in detail.
The terminology used herein is for the purpose of describing particular example embodiments only and is not intended to be limiting. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. The terms "comprises" and "comprising" are inclusive and, therefore, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. The method steps, processes, and operations described herein are not to be construed as necessarily requiring their performance in the particular order discussed and illustrated, unless specifically indicated. It should also be appreciated that additional or alternative steps may be employed.
When an element or layer is referred to as being "on," "engaged with," "connected to" or "coupled to" another element or layer, it can be directly on, engaged with, connected to or coupled to the other element or layer, or intervening elements or layers may also be present. In contrast, when an element or layer is referred to as being "directly on" … …, "" directly engaged with "… …," "directly connected to" or "directly coupled to" another element or layer, there may be no intervening elements or layers present. Other words used to describe the relationship of elements should be interpreted in a similar manner (e.g., "between … …" and "directly between … …", "adjacent" and "directly adjacent", etc.). The term "and/or" as used herein includes any and all combinations of one or more of the associated listed items. Although the terms first, second, third, etc. may be used herein to describe various elements, components, regions, layers and/or sections, these elements, components, regions, layers and/or sections should not be limited by these terms. These terms may be only used to distinguish one element, component, region or section from another element, component, region or section. Unless clearly indicated by the context, terms such as the terms "first," "second," and other numerical values are used herein to not imply a sequence or order. Accordingly, a first element, component, region, layer or section discussed below could be termed a second element, component, region, layer or section without departing from the teachings of the example embodiments.
Spatially relative terms, such as "inner," "outer," "below," "beneath," "lower," "above," "upper" and the like, may be used herein for ease of description to describe one element or feature's relationship to another element or feature's illustrated in the figures. Spatially relative terms may be intended to encompass different orientations of the device in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "below" or "beneath" other elements or features would then be oriented "above" the other elements or features. Thus, the example term "below" … … can encompass both upward and downward orientations. The device may be otherwise oriented (rotated 90 degrees or otherwise) and interpreted in the relative description of the space herein.
Claims (10)
1. The alcohol flow controller is characterized by comprising a power supply circuit, a Venturi bridge oscillation circuit, a bias voltage generation circuit, a square wave generation circuit, an adjustable resistor, a comparison modulation circuit and an electronic switch; wherein, the liquid crystal display device comprises a liquid crystal display device,
the power supply circuit is respectively connected with the Venturi bridge oscillating circuit, the bias voltage generating circuit, the square wave generating circuit and the electronic switch;
the bias voltage generating circuit is connected with the Venturi bridge oscillating circuit;
the comparison modulation circuit is respectively connected with the Venturi bridge oscillation circuit and the electronic switch;
the square wave generating circuit is connected with the electronic switch;
the electronic switch is connected with the alcohol pump;
the bias voltage generating circuit comprises a first operational amplifier U8A, a seventeenth resistor R17, a twenty-second capacitor C22 and a twenty-fourth resistor R24;
one end of the seventeenth resistor R17 is connected to one end of the twenty-fourth resistor R24; the other end of the twenty-fourth resistor R24 is grounded;
the twenty-second capacitor C22 is connected in parallel to two ends of the twenty-fourth resistor R24;
the non-inverting input end of the first operational amplifier U8A is connected between the seventeenth resistor R17 and the twenty-fourth resistor R24;
the inverting input terminal of the first operational amplifier U8A is connected with the output terminal of the first operational amplifier U8A.
2. The alcohol flow controller according to claim 1, wherein the electronic switch is a MOS transistor Q1.
3. The alcohol flow controller according to claim 2, wherein the power supply circuit includes a power supply input, a power supply output, a linear power converter U4, a ninth filter capacitor C9, a twelfth filter capacitor C12, a tenth filter capacitor C10, an eleventh filter capacitor C11, and a fifth interface P5;
one end of the ninth filter capacitor C9 and the twelfth filter capacitor C12 after being connected IN parallel are respectively connected with the power input end, the IN end of the linear power converter U4 and the fifth interface P5, and the other end is respectively connected with the fifth interface P5 and GND;
one end of the tenth filter capacitor C10 and one end of the eleventh filter capacitor C11 which are connected in parallel are respectively connected with the power output end and the OUT end of the linear power converter U4, and the other end of the tenth filter capacitor C10 is connected with GND;
the GND terminal GND of the linear power converter U4.
4. The alcohol flow controller according to claim 3, wherein the square wave generating circuit comprises a timer U5, a seventh interface P7, a sixth resistor R6, an eighth resistor R8, a seventh diode D7, a ninth diode D9, and a seventeenth capacitor C17;
one end of the seventh interface P7 is connected with the adjustable resistor, and the other end is respectively connected with one end of the sixth resistor R6, one end of the eighth resistor R8 and the anode of the seventh diode D7;
the other end of the sixth resistor R6 is connected with the RST end of the 555 timer U5;
the other end of the eighth resistor R8 is connected with the cathode of the ninth diode D9;
the positive electrode of the ninth diode D9 is connected with the seventeenth capacitor C17 and then connected with GND;
the negative electrode of the seventh diode D7 is connected with the seventeenth capacitor C17 and then connected with GND;
the RST end and the VCC end of the 555 timer U5 are respectively connected with the power supply output end;
the DIS end of the 555 timer U5 is connected with the anode of the seventh diode D7;
the THR end and the TRI end of the 555 timer U5 are respectively connected with the cathode of the seventh diode D7;
the CON end of the 555 timer U5 is connected with GND through a sixteenth capacitor;
GND of the 555 timer U5 is connected with GND;
the OUT terminal of the 555 timer U5 is connected to the twelfth interface P12.
5. The alcohol flow controller according to claim 4, wherein the gate of the MOS transistor Q1 is connected to the twelfth interface P12 through a seventh resistor R7;
the drain electrode of the MOS tube Q1 is connected with a sixth interface P6;
the source electrode of the MOS tube Q1 is connected with GND;
a fifteenth capacitor C15 is connected in parallel with two ends of the seventh resistor R7;
an eighth diode D8 and a ninth resistor R9 are connected in series between the grid electrode of the MOS tube Q1 and GND;
the grid electrode of the MOS tube Q1 is connected with the emitter electrode of the NPN triode Q2;
the base electrode of the NPN triode Q2 is connected between the seventh resistor R7 and the twelfth interface P12 through a tenth resistor R10;
the collector electrode of the NPN triode Q2 is grounded;
the sixth interface P6 is connected with the power input end;
the two ends of the sixth interface P6 are connected in parallel with a sixth diode D6, an anode of the sixth diode D6 is connected with the drain electrode of the MOS transistor Q1, and a cathode of the sixth diode D6 is connected with the power input end.
6. The alcohol flow controller according to claim 5, wherein the other end of the seventeenth resistor R17 is connected to the power supply output terminal.
7. The alcohol flow controller according to claim 6, wherein the venturi bridge oscillation circuit includes an eighteenth capacitor C18, an eleventh resistor R11, a nineteenth capacitor C19, a fifteenth resistor R15, a twenty-second resistor R22, an eighteenth resistor R18, a twenty-first resistor R21, a twelfth diode D10, an eleventh diode D11, and a second operational amplifier U6A;
one end of the nineteenth capacitor C19 is connected with the fifteenth resistor R15 in parallel, and then the other end of the nineteenth capacitor C19 is connected with the non-inverting input end of the second operational amplifier U6A, and the other end of the nineteenth capacitor C is connected with the output end of the first operational amplifier U8A;
the twenty-second resistor R22 is connected between the inverting input end of the second operational amplifier U6A and the output end of the first operational amplifier U8A;
the eighteenth resistor R18 is connected between the inverting input terminal of the second operational amplifier U6A and the output terminal of the second operational amplifier U6A;
one end of the twenty-first resistor R21 is connected with the inverting input end of the second operational amplifier U6A, and the other end of the twenty-first resistor R is connected with the negative electrode of the twelfth polar tube D10; the positive electrode of the twelfth electrode tube D10 is connected with the output end of the second operational amplifier U6A;
the positive electrode of the eleventh diode D11 is connected to the negative electrode of the twelfth diode D10, and the negative electrode of the eleventh diode D11 is connected to the positive electrode of the twelfth diode D10;
one end of the eighteenth capacitor C18 is connected to the non-inverting input end of the second operational amplifier U6A, and the other end is connected to one end of the eleventh resistor R11;
the other end of the eleventh resistor R11 is connected to the output end of the second operational amplifier U6A.
8. The alcohol flow controller according to claim 7, wherein the comparison modulation circuit includes an eighth interface P8, a twelfth resistor R12, a thirteenth resistor R13, a twentieth capacitor C20, a nineteenth resistor R19, a twentieth resistor R20, a third operational amplifier U6B, a fourteenth resistor R14, a comparator U7A, a sixteenth resistor R16, a tenth interface P10, a twenty-fifth resistor R25, a twenty-first capacitor C21, a voltage follower U8B, a thirty-fifth resistor R35, a ninth interface P9, and a twenty-third resistor R23;
the eighth interface P8 is connected to the output end of the second operational amplifier U6A and one end of the twelfth resistor R12, respectively; the other end of the twelfth resistor R12 is connected with GND;
one end of the thirteenth resistor R13 is connected between the twelfth resistor R12 and the eighth interface P8, and the other end is connected with the non-inverting input end of the third operational amplifier U6B;
one end of the nineteenth resistor R19 is connected with the inverting input end of the third operational amplifier U6B, and the other end is connected with GND;
one end of the twentieth capacitor C20 is connected between the thirteenth resistor R13 and the non-inverting input terminal of the third operational amplifier U6B, and the other end is connected between the nineteenth resistor R19 and GND;
one end of the twentieth resistor R20 is connected between the nineteenth resistor R19 and the inverting input end of the third operational amplifier U6B, and the other end of the twentieth resistor R20 is connected with the output end of the third operational amplifier U6B;
one end of the fourteenth resistor R14 is connected with the output end of the third operational amplifier U6B, and the other end of the fourteenth resistor R is connected with the non-inverting input end of the comparator U7A;
one end of the sixteenth resistor R16 is connected with the V+ end of the comparator U7A, and the other end of the sixteenth resistor R16 is connected with the output end of the comparator U7A;
the output end of the comparator U7A is connected with a twelfth interface P12;
one end of the thirty-fifth resistor R35 is connected with the inverting input end of the comparator U7A, and the other end of the thirty-fifth resistor R35 is connected with the output end of the voltage follower U8B;
the inverting input end of the voltage follower U8B is connected with the output end of the voltage follower U8B;
one end of the twenty-fifth resistor R25 is connected with the non-inverting input end of the voltage follower U8B, and the other end of the twenty-fifth resistor R is connected with the tenth interface P10;
one end of the twenty-first capacitor C21 is connected with the non-inverting input end of the voltage follower U8B, and the other end of the twenty-first capacitor C is connected with GND;
the tenth interface P10 is connected to the ninth interface P9;
one end of the twenty-third resistor R23 is connected with the power output end, and the other end of the twenty-third resistor R is connected with the ninth interface P9;
the ninth interface P9 and the tenth interface P10 are both connected to GND.
9. The alcohol flow controller according to claim 8, further comprising a twenty-third capacitor C23 and a twenty-fourth capacitor C24;
and one end of the twenty-third capacitor C23 and one end of the twenty-fourth capacitor C24 are connected in parallel and then are connected with the power output end, and the other end of the twenty-third capacitor C23 and the twenty-fourth capacitor C24 are connected with GND.
10. The alcohol flow controller according to claim 9, further comprising a thirteenth capacitor C13 and a fourteenth capacitor C14;
one end of the thirteenth capacitor C13 and the fourteenth capacitor C14 which are connected in parallel is connected with the power supply output end, and the other end of the thirteenth capacitor C13 is connected with the GND.
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| CN202110797619.XA CN113464413B (en) | 2021-07-14 | 2021-07-14 | Alcohol flow controller |
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| CN202110797619.XA CN113464413B (en) | 2021-07-14 | 2021-07-14 | Alcohol flow controller |
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| CN113464413B true CN113464413B (en) | 2023-04-25 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP3883662B2 (en) * | 1997-08-22 | 2007-02-21 | 株式会社ミツバ | Motor control circuit |
| CN101588141B (en) * | 2008-05-21 | 2013-04-17 | 汉能科技有限公司 | Piezoelectric ceramic pump driving power supply |
| CN202171757U (en) * | 2011-07-08 | 2012-03-21 | 北京物资学院 | DC (direct current) voltage stabilization power source capable of adjusting voltage |
| CN103163871B (en) * | 2013-04-08 | 2016-03-09 | 江苏大学 | A kind of electronic type PWM intermittent spraying formula variable sprays controller |
| CN204031099U (en) * | 2014-08-05 | 2014-12-17 | 苏州路之遥科技股份有限公司 | A kind of square-wave generator |
| CN205792491U (en) * | 2016-06-25 | 2016-12-07 | 衢州市沃思电子技术有限公司 | A kind of square-wave generator based on intervalometer |
| CN112332637A (en) * | 2020-09-28 | 2021-02-05 | 中国北方发动机研究所(天津) | Adjustable PWM drive control circuit |
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