CN217787745U - Infrared touch screen amplifying circuit, control circuit and circuit board - Google Patents
Infrared touch screen amplifying circuit, control circuit and circuit board Download PDFInfo
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- CN217787745U CN217787745U CN202222085477.7U CN202222085477U CN217787745U CN 217787745 U CN217787745 U CN 217787745U CN 202222085477 U CN202222085477 U CN 202222085477U CN 217787745 U CN217787745 U CN 217787745U
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- infrared touch
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Abstract
The utility model discloses an infrared touch screen amplifying circuit, a control circuit and a circuit board, wherein the infrared touch screen amplifying circuit comprises an operational amplifier circuit and an adjusting circuit; one input end of the operational amplifier circuit is used for receiving an analog signal, and the output end of the operational amplifier circuit is used for being connected with the MCU of the infrared touch screen, wherein the operational amplifier circuit sends the analog signal to the MCU so that the MCU sends a control signal according to the analog signal; the adjusting circuit comprises a programmable resistor, a fixed output end of the programmable resistor is connected with an output end of the operational amplifier circuit, a sliding end of the programmable resistor is connected with the other input end of the operational amplifier circuit, and a communication control end of the programmable resistor is connected with the MCU and used for adjusting the resistance of the programmable resistor according to the control signal so as to adjust the operational amplifier circuit to achieve different amplification factors. The utility model discloses can improve the regulation precision, simplify circuit structure.
Description
Technical Field
The utility model relates to an infrared touch screen technical field especially relates to an infrared touch screen amplifier circuit, control circuit and circuit board.
Background
The circuit design of the infrared touch screen circuit board is that an infrared receiving lamp tube receives an optical fiber signal, generates a corresponding analog signal, and feeds the analog signal back to the MCU for processing after the analog signal is amplified by an operational amplifier circuit. In the operational amplifier circuit part, currently, an analog switch IC is generally used to realize the automatic adjustment of the amplification factor, that is, the operational amplifier circuit part includes a plurality of channels, each channel is composed of an analog switch and an adjusting resistor, and the amplification factor is adjusted by controlling the on and off of the analog switches of different channels. However, the number of adjustment stages in the prior art is determined by the number of channels, the smaller the number of adjustment stages, the more the channels, the more the adjustment stages, but the more the channels, the more complicated the circuit, and meanwhile, the difference between the amplification factors of adjacent adjustment stages is large, which results in low adjustment precision.
SUMMERY OF THE UTILITY MODEL
The utility model provides an infrared touch-sensitive screen amplifier circuit, control circuit and circuit board can improve when simplifying the circuit and adjust the precision, satisfies different demands.
In a first aspect, the utility model provides an infrared touch screen amplifying circuit, which comprises an operational amplifier circuit and an adjusting circuit; one input end of the operational amplifier circuit is used for receiving an analog signal, and the output end of the operational amplifier circuit is used for being connected with the MCU of the infrared touch screen, wherein the operational amplifier circuit sends the analog signal to the MCU so that the MCU sends a control signal according to the analog signal; the adjusting circuit comprises a programmable resistor, a fixed output end of the programmable resistor is connected with an output end of the operational amplifier circuit, a sliding end of the programmable resistor is connected with the other input end of the operational amplifier circuit, and a communication control end of the programmable resistor is connected with the MCU and used for adjusting the resistance of the programmable resistor according to the control signal so as to adjust the operational amplifier circuit to achieve different amplification factors.
Further, the adjusting circuit further comprises a feedback resistor, and the feedback resistor is connected in parallel with the programmable resistor.
Furthermore, the operational amplifier circuit includes an operational amplifier, a positive input end of the operational amplifier is used for receiving the analog signal, a negative input end of the operational amplifier is connected with a sliding end of the programmable resistor, and an output end of the operational amplifier is respectively connected with the MCU and a fixed output end of the programmable resistor.
Further, the programmable resistor is a high-precision programmable resistor.
Further, the programmable resistor is a digital potentiometer.
Further, the number of bits of the digital potentiometer is eight.
Further, the upper limit of the resistance value of the digital potentiometer is one thousand ohms.
In a second aspect, the utility model also provides an infrared touch screen control circuit, infrared touch screen control circuit includes MCU and above-mentioned arbitrary infrared touch screen amplifier circuit.
Further, the MCU is respectively connected with the adjusting circuit and the operational amplifier circuit of the infrared touch screen amplifying circuit, the operational amplifier circuit is used for receiving analog signals and sending the analog signals to the MCU, and the MCU adjusts the resistance value of the programmable resistor of the adjusting circuit according to the analog signals and a preset target value.
A third aspect, the utility model also provides an infrared touch screen circuit board, infrared touch screen circuit board includes any one of the aforesaid infrared touch screen control circuit.
The utility model provides an infrared touch-sensitive screen amplifier circuit, control circuit and circuit board can receive analog signal through fortune amplifier circuit to send analog signal for MCU, MCU sends control signal control regulating circuit's resistance able to programme according to analog signal, and different resistances correspond different magnification, thereby improved the regulation precision, simultaneously, owing to need not additionally to increase other circuits, still simplified the circuit.
Drawings
In order to more clearly illustrate the technical solution of the present invention, the drawings required for the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of an infrared touch screen control circuit according to an embodiment of the present invention;
fig. 2 is a circuit diagram of an infrared touch screen control circuit according to an embodiment of the present invention.
Detailed Description
The technical solution of the present invention will be described clearly and completely with reference to the accompanying drawings, and obviously, the described embodiments are some, but not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
It will be understood that the terms "comprises" and/or "comprising," when used in this specification and the appended claims, 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.
It is also to be understood that the terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in the specification and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should be further understood that the term "and/or" as used in the specification and the appended claims refers to any and all possible combinations of one or more of the associated listed items and includes such combinations.
Referring to fig. 1 to fig. 2, fig. 1 is a schematic structural diagram of an infrared touch screen control circuit according to an embodiment of the present invention; fig. 2 is a circuit diagram of an infrared touch screen control circuit according to an embodiment of the present invention. As shown in fig. 1, the infrared touch screen amplifying circuit 100 provided by the present invention includes an operational amplifier circuit 10 and an adjusting circuit 20; one input end of the operational amplifier circuit 10 is configured to receive an analog signal, and an output end of the operational amplifier circuit 10 is configured to be connected to the MCU200 of the infrared touch screen, where the operational amplifier circuit 10 sends the analog signal to the MCU200 so that the MCU200 sends a control signal according to the analog signal; the adjusting circuit 20 includes a programmable resistor R1, a fixed output end C of the programmable resistor R1 is connected to an output end of the operational amplifier circuit 10, a sliding end B of the programmable resistor R1 is connected to another input end of the operational amplifier circuit 10, and a communication control end a of the programmable resistor R1 is connected to the MCU200, and is configured to adjust a resistance value thereof according to the control signal to adjust the operational amplifier circuit 10 to achieve different amplification factors.
Specifically, the adjusting circuit 20 may include a programmable resistor R1, the programmable resistor R1 may include two fixed output terminals C, one of the fixed output terminals C is connected to the output terminal of the operational amplifier circuit 10, the other fixed output terminal C may not be connected to any circuit, a sliding terminal B of the programmable resistor R1 is connected to one input terminal of the operational amplifier circuit 10, a communication control terminal a thereof is connected to the MCU200, and a resistance value thereof may be adjusted according to a control signal of the MCU200, so as to control an amplification factor of the operational amplifier circuit 10. For example, when the operational amplifier circuit 10 receives an analog signal, the analog signal is directly output to the MCU200, or is amplified by a predetermined fixed factor and then output to the MCU200, the MCU200 compares the analog signal with a predetermined target value according to the received analog signal, and sends a control signal to adjust the resistance of the programmable resistor R1 according to the difference between the analog signal and the predetermined target value, so that the resistance of the programmable resistor R1 satisfies the condition of amplifying the analog signal to the same value as the predetermined target value, thereby achieving automatic adjustment of the amplification factor.
As a further embodiment, the adjusting circuit 20 further includes a feedback resistor R2, and the feedback resistor R2 is connected in parallel with the programmable resistor R1.
A feedback resistor R2 may be connected in parallel with the programmable resistor R1, one end of the feedback resistor R2 is connected to the input end of the operational amplifier circuit 10, and the other end thereof is connected to the output end of the operational amplifier circuit 10. The MCU200 adjusts the total resistance of the parallel circuit composed of the programmable resistor R1 and the feedback resistor R2 by adjusting the resistance of the programmable resistor R1, thereby adjusting the amplification factor.
As a further embodiment, the operational amplifier circuit 10 includes an operational amplifier U1, a positive input end of the operational amplifier U1 is configured to receive the analog signal, a negative input end of the operational amplifier U1 is connected to a sliding end B of the programmable resistor R1, and an output end of the operational amplifier U1 is connected to the MCU200 and a fixed output end C of the programmable resistor R1 respectively.
The operational amplifier circuit 10 may include an operational amplifier U1, a positive input end of the operational amplifier U1 is configured to receive an analog signal and send the analog signal to the MCU200, and a negative input end of the operational amplifier U1 is connected to the sliding end B of the programmable resistor R1.
As a further embodiment, the programmable resistor R1 is a high-precision programmable resistor R1.
The adjusting stage number of the high-precision programmable resistor R1 can reach hundreds of stages, and the requirements of various occasions can be met.
As a further embodiment, the programmable resistor R1 is a digital potentiometer.
As a further embodiment, the digital potentiometer has eight bits.
As a further embodiment, the upper limit of the resistance of the digital potentiometer is one thousand ohms.
The number of adjustment stages of the eight-digit digital potentiometer is two hundred fifty-six, the upper limit of the resistance value of the eight-digit digital potentiometer can be one thousand ohms, that is, the resistance value of each stage is about 4 ohms, and the resistance value of the digital potentiometer can be adjusted according to actual conditions without limitation.
The utility model also discloses an infrared touch screen control circuit, infrared touch screen control circuit includes MCU200 and any one of the above-mentioned embodiment infrared touch screen amplifier circuit 100.
The MCU200 is configured to control the resistance of the programmable resistor R1 of the infrared touch screen amplifying circuit 100 according to the analog signal, so as to adjust the amplification factor.
As a further embodiment, the MCU200 is connected to the adjusting circuit 20 and the operational amplifier circuit 10 of the infrared touch screen amplifying circuit 100, the operational amplifier circuit 10 is configured to receive an analog signal and send the analog signal to the MCU200, and the MCU200 adjusts the resistance of the programmable resistor R1 of the adjusting circuit 20 according to the analog signal and a preset target value.
The ADC port of the MCU200 may be connected to the output end of the operational amplifier U1, convert the received analog signal into a digital signal, compare the digital signal with a preset target value to generate a comparison value, determine the gain value of the analog signal according to the comparison value, and finally send a control signal according to the gain value of the analog signal to control the resistance of the programmable resistor R1, so as to adjust the amplification factor to a desired factor.
The utility model also discloses an infrared touch screen circuit board, infrared touch screen circuit board includes any one of the above-mentioned embodiment infrared touch screen control circuit.
The utility model discloses be equipped with a resistance able to programme, accessible MCU control resistance able to programme, and then realize the adjustment to the magnification, can satisfy the demand of different scenes, and need not to set up other circuits, when having simplified the circuit, improved the regulation precision.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily think of various equivalent modifications or substitutions within the technical scope of the present invention, and these modifications or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. The utility model provides an infrared touch screen amplifier circuit, is applied to infrared touch screen, its characterized in that includes:
the input end of the operational amplifier circuit is used for receiving an analog signal, and the output end of the operational amplifier circuit is used for being connected with the MCU of the infrared touch screen, wherein the operational amplifier circuit sends the analog signal to the MCU so that the MCU sends a control signal according to the analog signal; and
the adjusting circuit comprises a programmable resistor, a fixed output end of the programmable resistor is connected with an output end of the operational amplifier circuit, a sliding end of the programmable resistor is connected with the other input end of the operational amplifier circuit, and a communication control end of the programmable resistor is connected with the MCU and used for adjusting the resistance value of the programmable resistor according to the control signal so as to adjust the operational amplifier circuit to realize different amplification factors.
2. The infrared touch screen amplification circuit of claim 1, wherein the adjustment circuit further comprises a feedback resistor connected in parallel with the programmable resistor.
3. The infrared touch screen amplifier circuit as set forth in claim 1, wherein the operational amplifier circuit comprises an operational amplifier, a positive input terminal of the operational amplifier is used for receiving the analog signal, a negative input terminal of the operational amplifier is connected with a sliding terminal of the programmable resistor, and an output terminal of the operational amplifier is connected with a fixed output terminal of the MCU and the programmable resistor, respectively.
4. The infrared touch screen amplification circuit of claim 1, wherein the programmable resistance is a high precision programmable resistor.
5. The infrared touch screen amplification circuit of claim 1, wherein the programmable resistance is a digital potentiometer.
6. The infrared touch screen amplification circuit of claim 5, wherein the digital potentiometer has eight bits.
7. The infrared touch screen amplification circuit of claim 5, wherein the digital potentiometer has a resistance with an upper limit of one kilo ohm.
8. An infrared touch screen control circuit, characterized by comprising an MCU and an infrared touch screen amplification circuit according to any one of claims 1 to 7.
9. The infrared touch screen control circuit according to claim 8, wherein the MCU is connected to the adjusting circuit and the operational amplifier circuit of the infrared touch screen amplifying circuit, respectively, the operational amplifier circuit is configured to receive an analog signal and transmit the analog signal to the MCU, and the MCU adjusts the resistance of the programmable resistor of the adjusting circuit according to the analog signal and a preset target value.
10. An infrared touch screen circuit board, characterized by comprising the infrared touch screen control circuit according to any one of claims 8 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222085477.7U CN217787745U (en) | 2022-08-09 | 2022-08-09 | Infrared touch screen amplifying circuit, control circuit and circuit board |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222085477.7U CN217787745U (en) | 2022-08-09 | 2022-08-09 | Infrared touch screen amplifying circuit, control circuit and circuit board |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217787745U true CN217787745U (en) | 2022-11-11 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202222085477.7U Active CN217787745U (en) | 2022-08-09 | 2022-08-09 | Infrared touch screen amplifying circuit, control circuit and circuit board |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN217787745U (en) |
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2022
- 2022-08-09 CN CN202222085477.7U patent/CN217787745U/en active Active
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