Signal strength adjustment circuit, infrared touch device and electronic equipment

Abstract

The present disclosure provides a signal strength adjustment circuit, an infrared touch device and an electronic device. The signal strength adjustment circuit includes a signal acquisition circuit, a controller and a signal adjustment circuit; the signal adjustment circuit includes a switch element, a first signal end of the switch element is connected to a signal output end of the signal acquisition circuit to form a signal voltage division node, the signal voltage division node is connected to a signal input end of the controller, its second signal end is connected to a reference power supply, and its controlled end is connected to a control end of the controller; the controller outputs a corresponding adjustment signal to the controlled end of the switch element according to the current touch sampling signal strength, the switch element receives adjustment signals of different strengths to generate different on-resistances, the signal voltage division node generates touch sampling signals of different strengths at the next moment under the voltage division effect of the output impedance of the signal acquisition circuit and the on-resistance, and transmits them to the signal input end of the controller to achieve more precise signal strength adjustment, and the circuit structure is simple and easy to implement.

Description

Technical Field

[0001] The present disclosure relates to the technical field of electronic circuits, and in particular to a signal strength adjustment circuit, an infrared touch device, and an electronic device. Background Art

[0002] On interactive tablets or other touch devices, a touch circuit is usually set up to collect, filter, and amplify touch signals. A general touch circuit includes a signal input circuit, a filter circuit, a signal conditioning circuit, and a controller that are electrically connected in sequence. The signal conditioning circuit is composed of an analog switch chip, an operational amplifier, and a matching resistor. Controlling the channel selection of the analog switch chip can adjust the signal amplification factor, thereby changing the signal strength.

[0003] However, during the research and development process, the inventors of the present application discovered that the adjustment levels of the analog switch chip are limited by the limited number of channels inside the analog switch chip, and the adjustment levels are only four to eight, which is a small number of adjustment levels. Therefore, the adjustable fineness of the signal adjustment circuit is affected. If more levels of adjustment are required, multi-level chip cascading is required to achieve this, which results in a complex circuit structure and a high implementation cost. Summary of the invention

[0004] To overcome the problems existing in the related art, the embodiments of the present disclosure provide a touch sampling signal strength adjustment circuit applied to an electronic device with a touch function. The signal strength adjustment circuit can make more precise adjustments to the sampled signal, and the circuit structure is simple and easy to implement.

[0005] According to a first aspect of an embodiment of the present disclosure, a signal strength adjustment circuit is provided, comprising a signal acquisition circuit, a controller and a signal adjustment circuit; the signal adjustment circuit is connected between the signal acquisition circuit and the controller; the controller has a signal input terminal and a control terminal;

[0006] The signal conditioning circuit includes a switch element, the switch element having a first signal terminal, a second signal terminal and a controlled terminal;

[0007] The first signal end of the switch element is connected to the signal output end of the signal acquisition circuit to form a signal voltage division node, the signal voltage division node is connected to the signal input end of the controller, the second signal end of the switch element is connected to the reference power supply, and the controlled end of the switch element is connected to the control end of the controller;

[0008] The controller is used to output a corresponding adjustment signal to the controlled end of the switching element according to the touch sampling signal received at the current moment. The switching element is used to generate a corresponding on-resistance according to the adjustment signal. The signal voltage-dividing node is used to form a touch sampling signal at the next moment under the voltage-dividing action of the output impedance of the signal acquisition circuit and the on-resistance, and transmit it to the signal input end of the controller.

[0009] According to a second aspect of the embodiments of the present disclosure, an infrared touch device is provided, comprising a signal strength adjustment circuit and an infrared signal receiving unit as described in any one of the above embodiments.

[0010] According to a third aspect of the embodiments of the present disclosure, an electronic device is provided, including an execution device and the infrared touch device of the above embodiment.

[0011] By applying the technical solution of the embodiment of the present disclosure, a signal adjustment circuit for adjusting the strength of the touch sampling signal is set between the signal acquisition circuit and the controller to adjust the voltage of the touch sampling signal. When the controller outputs adjustment signals of different voltages, on-resistances of different resistance values ​​are generated inside the switch element of the signal adjustment circuit. The on-resistance and the output impedance of the signal acquisition circuit form a voltage divider circuit, thereby dividing the touch sampling signal to be sampled and forming touch sampling signals of different strengths at the current moment at the signal voltage divider node. The voltage value at the signal voltage divider node changes with the change of the adjustment signal, thereby adjusting the strength of the touch sampling signal at the next moment with a relatively fine adjustment degree.

[0012] It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present disclosure.

[0013] For better understanding and implementation, the present disclosure is described in detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 A principle block diagram of a signal strength adjustment circuit shown in an embodiment of the present disclosure;

[0015] Figure 2 A schematic diagram of the output impedance of a signal acquisition circuit shown in an embodiment of the present disclosure;

[0016] Figure 3 This is a circuit schematic diagram of a signal strength adjustment circuit shown in Embodiment 1 of the present disclosure;

[0017] Figure 4 This is a circuit schematic diagram of a signal strength adjustment circuit shown in Embodiment 2 of the present disclosure;

[0018] Figure 5 This is a circuit schematic diagram of a signal strength adjustment circuit shown in Embodiment 3 of the present disclosure;

[0019] Figure 6 This is a circuit schematic diagram of a signal strength adjustment circuit shown in Embodiment 4 of the present disclosure. DETAILED DESCRIPTION

[0020] Exemplary embodiments will be described in detail herein, examples of which are shown in the accompanying drawings. When the following description refers to the drawings, the same numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present disclosure. Instead, they are merely examples of devices and methods consistent with some aspects of the present disclosure as detailed in the appended claims.

[0021] The terms used in this disclosure are for the purpose of describing specific embodiments only and are not intended to limit the disclosure. The singular forms of "a", "said" and "the" used in this disclosure and the appended claims are also intended to include plural forms unless the context clearly indicates otherwise. It should also be understood that the term "and / or" used herein refers to and includes any or all possible combinations of one or more associated listed items.

[0022] It should be understood that although the terms first, second, third, etc. may be used in the present disclosure to describe various information, such information should not be limited to these terms. These terms are only used to distinguish the same type of information from each other. For example, without departing from the scope of the present disclosure, the first information may also be referred to as the second information, and similarly, the second information may also be referred to as the first information. Depending on the context, the words "if" / "if" as used herein may be interpreted as "at the time of" or "when" or "in response to determining".

[0023] The signal conditioning circuit in the original touch device is limited by the limited number of channels inside the analog switch chip, with few adjustable gears, unable to achieve more precise sampling signal adjustment, and is not convenient to use.

[0024] To solve the above problems, the embodiments of the present disclosure provide a signal strength adjustment circuit, an infrared touch device and an electronic device. The signal strength adjustment circuit can make a more precise adjustment on the sampled signal, and has a simple circuit structure and is easy to implement.

[0025] Hereinafter, embodiments of the technical solution of the present disclosure will be described in conjunction with the accompanying drawings.

[0026] According to a first aspect of an embodiment of the present disclosure, a signal strength adjustment circuit is provided, which can be applied to an electronic device with a touch function to adjust the strength of a touch signal when the touch signal of the electronic device is collected. The electronic device can be an interactive tablet, a smart blackboard, a smart whiteboard, a personal computer, an industrial computer, a smart home central control, or other smart device, and the touch signal can be an infrared touch signal or other touch signal.

[0027] See also Figure 1 and Figure 2 , Figure 1 A principle block diagram of a signal strength adjustment circuit shown in an embodiment of the present disclosure; Figure 2 This is a schematic diagram of the output impedance of the signal acquisition circuit shown in an embodiment of the present disclosure.

[0028] The signal strength adjustment circuit includes a signal acquisition circuit 10, a controller 20 and a signal adjustment circuit 30; the signal adjustment circuit 30 is connected between the signal acquisition circuit 10 and the controller 20. The signal acquisition circuit 10 is used to acquire a touch sampling signal to be sampled, such as Figure 2 As shown, the signal acquisition circuit 10 has a certain output impedance Zout.

[0029] The controller 20 can play a main control role, which can be a core processor of an electronic device, or a dedicated processor dedicated to realizing the touch function, and can generate a corresponding adjustment signal for adjusting the signal adjustment circuit 30 according to the touch sampling signal received at the current moment, such as infrared, electromagnetic or capacitive touch signals. The controller 20 has a signal input terminal and a control terminal. The signal adjustment circuit 30 is used to adjust the intensity of the touch signal obtained by the signal acquisition circuit 10. It includes a switch element, which can be a voltage-controlled switch element. When its controlled end (enable end) receives different voltage signals, different on-resistances will be generated inside it. The switch element has a first signal end, a second signal end and a controlled end; the first signal end of the switch element is connected to the signal output end of the signal acquisition circuit 10 and forms a signal voltage division node 40, the signal voltage division node 40 is connected to the signal input end of the controller 20, the second signal end of the switch element is connected to the reference power supply, and the controlled end of the switch element is connected to the control end of the controller 20; the controller 20 is used to output a corresponding adjustment signal to the controlled end of the switch element according to the received touch sampling signal at the current moment, the switch element receives adjustment signals of different strengths to generate on-resistances of different resistance values, the signal voltage division node 40 forms a touch sampling signal at the next moment under the voltage division effect of the output impedance of the signal acquisition circuit 10 and the on-resistance, that is, generates voltage sampling signals of different strengths, and transmits them to the signal input end of the controller 20. The controller 20 then generates a corresponding adjustment signal according to the touch sampling signal received in real time and outputs it to the controlled end of the switch element, thereby making the on-resistance of the switch element follow the adjustment to change the strength of the touch sampling signal at the next moment, and the adjustment accuracy is high.

[0030] like Figure 2 As shown, the output impedance of the signal acquisition circuit 10 is Zout, which is very important for the signal acquisition circuit 10 and measures the output capability of the signal acquisition circuit 10. Optionally, in order to match the output impedance of the signal acquisition circuit 10 with the on-resistance of the switch element, the output impedance Zout may be within an optional range, such as between 10R and 1KΩ.

[0031] The technical solution of this embodiment realizes voltage regulation of the touch sampling signal to be sampled by setting a signal regulation circuit 30 for adjusting the strength of the touch sampling signal between the signal acquisition circuit 10 and the controller 20. When the controller 20 outputs regulation signals of different voltages, on-resistances of different resistances are generated inside the switch element of the signal regulation circuit 30. The on-resistances and the output impedance of the signal acquisition circuit form a voltage divider circuit, thereby dividing the touch sampling signal to be sampled at the current moment and forming a touch sampling signal of the next moment with different voltage strengths at the signal voltage division node 40. The voltage value at the signal voltage division node 40 changes with the change of the regulation signal, thereby realizing the intensity regulation of the touch sampling signal at the next moment with a relatively fine regulation degree.

[0032] In this embodiment, the signal acquisition circuit 10 can be a front-end signal conditioning circuit, which is connected to a touch sensor such as an infrared signal receiving unit, receives the touch sampling signal to be sampled, filters, amplifies, and processes it, and then transmits it to the controller 20 after being conditioned by the signal conditioning circuit 30.

[0033] The controller 20 is the main control device of the circuit. After receiving the current touch sampling signal, it can control the execution device to execute the corresponding instruction to achieve the corresponding touch function. The specific model of the controller 20 is not limited, and it can be a processing device such as a single chip microcomputer.

[0034] Optionally, the controller 20 is used to generate a corresponding adjustment signal based on the touch sampling signal received at the current moment and the preset target value, wherein the preset target value may be a preset ideal sampling signal value. However, since the use environment and circuit, etc. may affect the touch sampling signal, it is necessary to generate a corresponding adjustment signal based on the touch sampling signal at the current moment and the preset target value and transmit it to the controlled end of the switching element.

[0035] The reference power source connected to the second signal terminal of the switch element may be an auxiliary power source of a preset voltage value, such as a positive voltage or a negative voltage, or may be a zero potential auxiliary power source, ie, a reference ground (GND).

[0036] The switch element may be a voltage-controlled switch element, and when its controlled end (enabling end) receives different voltage signals, different on-resistances will be generated inside the switch element.

[0037] In an optional embodiment, the voltage-controlled switch element may be a transistor, a field effect transistor, or other voltage-controlled switches. The transistor includes an NPN transistor and a PNP transistor; the field effect transistor includes an N-channel field effect transistor and a P-channel field effect transistor.

[0038] If the voltage-controlled switching element is a transistor; the base of the transistor is the controlled end of the switching element, its collector or emitter is the first signal end of the switching element, and its emitter or collector is the second signal end of the switching element; the collector or emitter of the transistor is connected to the signal output end of the signal acquisition circuit to form a signal voltage dividing node 40, the emitter or collector of the transistor is connected to the reference power supply, and the base of the transistor is connected to the control end of the controller.

[0039] If the voltage-controlled switching element is a field effect tube; the gate of the field effect tube is the controlled end of the switching element, the drain or source of the field effect tube is the first signal end of the switching element, and the source or drain of the field effect tube is the second signal end of the switching element; the drain or source of the field effect tube is connected to the signal output end of the signal acquisition circuit to form a signal voltage dividing node 40, the source or drain of the field effect tube is connected to the reference power supply, and the gate of the field effect tube is connected to the control end of the controller.

[0040] It should be noted that the voltage-controlled switch element has multiple states such as saturation, conduction and cutoff. In the embodiment of the present disclosure, the corresponding state can be selected according to the needs.

[0041] The following is a description of a specific embodiment of a voltage-controlled switch element.

[0042] See also Figure 3 , Figure 3 This is a circuit schematic diagram of a signal strength adjustment circuit according to Embodiment 1 of the present disclosure.

[0043] In this embodiment, the voltage-controlled switch element is an NPN transistor Q1.

[0044] The base B of the NPN transistor Q1 is the controlled end of the switching element, its collector C is the first signal end of the switching element, and its emitter E is the second signal end of the switching element; the collector C of the NPN transistor Q1 is connected to the signal output end of the signal acquisition circuit 10 and forms a signal voltage dividing node 40, and the emitter E of the NPN transistor Q1 is connected to the reference power supply, that is, ground; the base B of the NPN transistor Q1 is connected to the control end of the controller 20 to receive the adjustment signal.

[0045] When the controller 20 outputs adjustment signals of different voltages, on-resistances of different resistances are generated inside the NPN transistor Q1. The on-resistance and the output impedance of the signal acquisition circuit 10 form a voltage divider circuit, thereby dividing the touch sampling signal to be sampled and forming a current touch sampling signal with different voltage strengths at the signal voltage dividing node 40. The voltage value at the signal voltage dividing node 40 changes with the change of the adjustment signal, thereby realizing the intensity adjustment of the touch sampling signal at the current moment, and has a finer adjustment degree, and the adjustable fineness is no longer limited by the number of channels of the analog switch chip.

[0046] In an optional embodiment, the voltage-controlled switch element is a PNP transistor Q1.

[0047] See also Figure 4 , Figure 4 This is a circuit schematic diagram of a signal strength adjustment circuit shown in Embodiment 2 of the present disclosure.

[0048] The base B of the PNP transistor Q1 is the controlled end of the switching element, its emitter E is the first signal end of the switching element, and its collector C is the second signal end of the switching element; the emitter E of the PNP transistor Q1 is connected to the signal output end of the signal acquisition circuit 10 and forms a signal voltage dividing node 40, and the collector of the PNP transistor Q1 is connected to the reference power supply, that is, ground; the base B of the PNP transistor Q1 is connected to the control end of the controller 20 to receive the adjustment signal.

[0049] When the controller 20 outputs adjustment signals of different voltages, on-resistances of different resistances are generated inside the PNP transistor Q1. The on-resistance and the output impedance of the signal acquisition circuit form a voltage divider circuit, thereby dividing the touch sampling signal to be sampled and forming a current touch sampling signal of different voltage strengths at the signal voltage dividing node 40. The voltage value at the signal voltage dividing node 40 changes with the change of the adjustment signal, thereby realizing the intensity adjustment of the touch sampling signal at the current moment, and has a finer adjustment degree, and the adjustable fineness is no longer limited by the number of channels of the analog switch chip.

[0050] In an optional embodiment, the voltage-controlled switch element may be an N-channel field effect transistor.

[0051] See also Figure 5 , Figure 5 This is a circuit schematic diagram of a signal strength adjustment circuit shown in Embodiment 3 of the present disclosure.

[0052] The gate G of the N-channel field effect transistor Q1 is the controlled end of the switching element, the drain D of the N-channel field effect transistor Q1 is the first signal end of the switching element, and the source S of the N-channel field effect transistor Q1 is the second signal end of the switching element; the drain D of the N-channel field effect transistor Q1 is connected to the signal output end of the signal acquisition circuit 10 and forms a signal voltage dividing node 40, the source S of the N-channel field effect transistor Q1 is connected to the reference power supply (ground), and the gate G of the N-channel field effect transistor Q1 is connected to the control end of the controller 20 to receive the adjustment signal.

[0053] When the controller outputs adjustment signals of different voltages, on-resistances of different resistances are generated inside the N-channel field effect transistor Q1. The on-resistance and the output impedance at the back end of the signal acquisition circuit form a voltage divider circuit, thereby dividing the touch sampling signal to be sampled and forming a current touch sampling signal with different voltage strengths at the signal voltage dividing node 40. The voltage value at the signal voltage dividing node 40 changes with the change of the adjustment signal, thereby realizing the intensity adjustment of the touch sampling signal at the current moment, and has a finer adjustment degree, and the adjustable fineness is no longer limited by the number of channels of the analog switch chip.

[0054] In an optional embodiment, the voltage-controlled switch element may be a P-channel field effect transistor.

[0055] See also Figure 6 , Figure 6 This is a circuit schematic diagram of a signal strength adjustment circuit shown in Embodiment 4 of the present disclosure.

[0056] The gate G of the P-channel field effect transistor Q1 is the controlled end of the switching element, the source S of the P-channel field effect transistor Q1 is the first signal end of the switching element, and the drain D of the P-channel field effect transistor Q1 is the second signal end of the switching element; the source S of the P-channel field effect transistor Q1 is connected to the signal output end of the signal acquisition circuit 10 and forms a signal voltage dividing node 40, the drain D of the P-channel field effect transistor Q1 is connected to the reference power supply (ground), and the gate G of the P-channel field effect transistor Q1 is connected to the control end of the controller 20 to receive the adjustment signal.

[0057] When the controller 20 outputs adjustment signals of different voltages, on-resistances of different resistances are generated inside the P-channel field effect transistor Q1. The on-resistance and the output impedance of the signal acquisition circuit form a voltage divider circuit, thereby dividing the touch sampling signal to be sampled and forming voltage sampling signals of different strengths at the signal voltage divider node 40. The voltage value at the signal voltage divider node 40 changes with the change of the adjustment signal, thereby achieving intensity adjustment of the touch sampling signal at the current moment, and having a finer adjustment degree, and the adjustable fineness is no longer limited by the number of channels of the analog switch chip.

[0058] In an optional embodiment, if Figures 3 to 6As shown, the signal conditioning circuit 30 also includes a first resistor R1, which is connected between the output end of the signal acquisition circuit 10 and the signal voltage dividing node 40; the first resistor R1 is connected in series with the switch element Q1, and if the internal output impedance of the signal acquisition circuit 10 is small and can be ignored, the on-resistance generated by the switch element Q1 and the first resistor R1 divide the touch sampling signal output by the signal acquisition circuit. If the internal output impedance of the signal acquisition circuit 10 is large, the on-resistance generated by the switch element Q1, the first resistor R1 and the output impedance Zout divide the touch sampling signal to be sampled output by the signal acquisition circuit 10.

[0059] In order to make the first resistor R1 match the on-resistance of the switch element, the resistance of the first resistor R1 may be within an optional range, such as between 10R and 1KΩ.

[0060] The first resistor R1 may be a fixed resistor or an adjustable resistor. If the first resistor R1 is an adjustable resistor, the user can also adjust the signal adjustment strength by adjusting the actual resistance value of the first resistor R1, which is more flexible to use.

[0061] Optionally, the first resistor R1 may be disposed inside or outside the signal acquisition circuit 10 , which is not limited in this embodiment.

[0062] When the controller 20 outputs adjustment signals of different magnitudes, the on-resistance of the switch element Q1 changes when it is in various states. Therefore, if the internal output impedance of the signal acquisition circuit 10 can be ignored, the touch sampling signal to be sampled is divided under the action of the first resistor R1 and the on-resistance of the switch element Q1, and the adjusted sampling signal is obtained at the signal voltage dividing node 40 and transmitted to the controller 20. During voltage division, the ratio of the first resistor R1 and the on-resistance of the switch element Q1 will affect the magnitude of the touch sampling signal at the next moment, thereby realizing the intensity regulation of the touch sampling signal at the next moment.

[0063] In an optional embodiment, if Figure 5 As shown, a filter circuit is connected in parallel between the first signal terminal and the second signal terminal of the switch element Q1. The filter circuit includes a second resistor R2 and a first capacitor C1, which can filter the current touch sampling signal output by the signal voltage dividing node 40 to improve the quality.

[0064] The signal strength adjustment circuit described in the above embodiment realizes voltage adjustment of the touch sampling signal to be sampled by setting a signal adjustment circuit for adjusting the sampling signal strength between the signal acquisition circuit and the controller. When the controller outputs adjustment signals of different voltages, the switch element of the signal adjustment circuit generates on-resistances of different resistances inside. The on-resistances and the output impedance of the signal acquisition circuit form a voltage divider circuit, thereby dividing the touch sampling signal to be sampled at the current moment and forming touch sampling signals of different strengths at the next moment at the signal voltage divider node. The voltage value at the signal voltage divider node changes with the change of the adjustment signal, thereby realizing the intensity adjustment of the touch sampling signal at the next moment, and has a relatively fine adjustment degree, and the circuit structure is simple and easy to implement.

[0065] According to a second aspect of the embodiments of the present disclosure, an infrared touch device is provided, including a touch signal receiving unit and a signal strength adjustment circuit as described in the previous embodiments.

[0066] The touch signal receiving unit is electrically connected to the signal strength adjustment circuit. After receiving the touch signal, the touch signal receiving unit transmits it to the signal acquisition circuit for pre-stage signal processing, and then transmits it to the signal adjustment circuit for signal strength adjustment. Finally, the voltage sampling signal after strength adjustment is transmitted to the controller so that the controller controls the execution device to perform corresponding actions.

[0067] According to a third aspect of an embodiment of the present disclosure, an electronic device is provided, including an execution device and a touch control device as described in the previous embodiment.

[0068] The electronic device may be an interactive tablet with a touch function, a smart blackboard, a smart whiteboard, a personal computer, an industrial computer, a smart home central control, or other electronic device, which is not limited in this embodiment.

[0069] The execution device may be a display screen or other execution components.

[0070] The electronic device described in the above embodiment realizes voltage regulation of the touch sampling signal to be sampled by setting a signal regulation circuit for adjusting the sampling signal strength between the signal acquisition circuit and the controller. When the controller outputs regulation signals of different voltages, on-resistances of different resistances are generated inside the switch element of the signal regulation circuit. The on-resistance and the output impedance of the signal acquisition circuit form a voltage divider circuit, thereby dividing the touch sampling signal to be sampled at the current moment and forming touch sampling signals of different strengths at the next moment at the signal voltage division node. The voltage value at the signal voltage division node changes with the change of the regulation signal, thereby realizing the intensity regulation of the touch sampling signal at the next moment, and has a relatively fine regulation degree, and the circuit structure is simple and easy to implement.

[0071] The above embodiments only express several implementation methods of the present disclosure, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present disclosure, and these all belong to the protection scope of the present disclosure.

Claims

1. A touch sampling signal strength adjustment circuit applied to an electronic device with a touch function, comprising a signal acquisition circuit, a controller and a signal adjustment circuit; the signal adjustment circuit is connected between the signal acquisition circuit and the controller; the controller has a signal input terminal and a control terminal; characterized in that: The signal acquisition circuit is a front-end signal conditioning circuit, which is connected to the touch sensor and receives the touch sampling signal of the touch sensor; The signal conditioning circuit comprises a switch element, the switch element is a voltage-controlled switch element, and the switch element has a first signal terminal, a second signal terminal and a controlled terminal; The first signal end of the switch element is connected to the signal output end of the signal acquisition circuit to form a signal voltage division node, the signal voltage division node is connected to the signal input end of the controller, the second signal end of the switch element is connected to a reference power supply, and the controlled end of the switch element is connected to the control end of the controller; The controller is used to output a corresponding adjustment signal to the controlled end of the switch element according to the touch sampling signal received at the current moment, the switch element is used to generate a corresponding on-resistance according to the adjustment signal, and the signal voltage-dividing node is used to form a touch sampling signal at the next moment under the voltage-dividing effect of the output impedance of the signal acquisition circuit and the on-resistance, and transmit it to the signal input end of the controller.

2. The touch sampling signal strength adjustment circuit for an electronic device with a touch function according to claim 1, characterized in that: The voltage-controlled switch element is a triode; the base of the triode is the controlled end of the switch element, the collector or emitter is the first signal end of the switch element, and the emitter or collector is the second signal end of the switch element; The collector or emitter of the transistor is connected to the signal output end of the signal acquisition circuit to form a signal voltage dividing node, the emitter or collector of the transistor is connected to a reference power supply, and the base of the transistor is connected to the control end of the controller.

3. The touch sampling signal strength adjustment circuit for an electronic device with a touch function according to claim 1, characterized in that: The voltage-controlled switch element is a field effect tube; the gate of the field effect tube is the controlled end of the switch element, the drain or source of the field effect tube is the first signal end of the switch element, and the source or drain of the field effect tube is the second signal end of the switch element; The drain or source of the field effect tube is connected to the signal output end of the signal acquisition circuit to form a signal voltage dividing node, the source or drain of the field effect tube is connected to a reference power supply, and the gate of the field effect tube is connected to the control end of the controller.

4. The touch sampling signal strength adjustment circuit for an electronic device with a touch function according to claim 1, characterized in that: The signal conditioning circuit also includes a first resistor, which is connected between the output end of the signal acquisition circuit and the signal voltage dividing node; the first resistor is connected in series with the switching element, and the on-resistance generated by the switching element and the output impedance of the signal acquisition circuit and the first resistor divide the touch sampling signal to be sampled output by the signal acquisition circuit.

5. The touch sampling signal strength adjustment circuit for an electronic device with a touch function according to claim 1, characterized in that: A filter circuit is connected in parallel between the first signal terminal and the second signal terminal of the switch element.

6. The touch sampling signal strength adjustment circuit for an electronic device with a touch function according to claim 1, characterized in that: The reference power supply is a positive voltage, a negative voltage or a reference ground.

7. The touch sampling signal strength adjustment circuit for an electronic device with a touch function according to any one of claims 1 to 6, characterized in that: The controller is used to generate the corresponding adjustment signal according to the touch sampling signal at the current moment and the preset target value.

8. An infrared touch device, characterized in that: It comprises an infrared signal receiving unit and a touch sampling signal strength adjustment circuit applied to an electronic device with a touch function as claimed in any one of claims 1 to 7.

9. An electronic device, characterized in that: It comprises an execution device and the infrared touch control device as claimed in claim 8.

Images