CN111103488A - Touch detection circuit, touch sensor and ring receiver - Google Patents
Touch detection circuit, touch sensor and ring receiver Download PDFInfo
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- CN111103488A CN111103488A CN201911354419.6A CN201911354419A CN111103488A CN 111103488 A CN111103488 A CN 111103488A CN 201911354419 A CN201911354419 A CN 201911354419A CN 111103488 A CN111103488 A CN 111103488A
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Abstract
The invention discloses a touch detection circuit, which comprises: the device comprises a power management module, a touch module and a rectification filtering module; the signal output end of the power management module is electrically connected with the touch module; the first end of the touch module is electrically connected with the power management module, the second end of the touch module is electrically connected with the rectification filtering module, and the third end of the touch module is a touch point; the rectifying and filtering module comprises an input end and a touch voltage output node. Therefore, the touch detection circuit comprising the power management module without a touch detection function, the touch module and the rectification filter module can be used for realizing touch detection, and because the output signal of the power management module is output by the power supply, whether touch occurs can be directly judged according to the voltage output by the touch voltage output node, and a specific touch signal detection device is not required to be additionally adopted for detecting the touch signal, so that the cost of touch detection is greatly reduced.
Description
Technical Field
The invention relates to the field of circuit electronics, in particular to a touch detection circuit, a touch sensor and a ring storage box.
Background
With the popularization of electronic products, people have an increasing demand for touch detection of electronic products, and therefore touch sensors are increasingly popular. A touch sensor, also known as a touch detector, is a device that captures and records a physical touch or hug on a device and/or object, which enables the device or object to detect the touch, typically by a human user, operator, or other substance.
In the prior art, a dedicated touch sensor chip is usually used for touch detection, but since the dedicated touch sensor chip does not have a power output function but only has a touch signal output function, a specific touch signal detection device needs to be additionally used for detecting a touch signal, which results in high cost of the touch detection device.
Disclosure of Invention
The invention provides a touch detection circuit, a touch sensor and a ring storage box, which can directly judge whether a touch module in the touch detection circuit touches according to the voltage output by a touch voltage output node in the touch detection circuit, and does not need to additionally adopt a specific touch signal detection device to detect a touch signal as in the prior art, thereby greatly reducing the cost of touch detection.
In a first aspect, the present invention provides a touch detection circuit, comprising: the device comprises a power management module, a touch module and a rectification filtering module;
the power management module comprises a signal output end, the signal output end is electrically connected with the touch module, and the power management module is used for providing alternating current for the touch module;
the touch module comprises a first end, a second end and a third end, the first end of the touch module is electrically connected with the power management module, the second end of the touch module is electrically connected with the rectifying and filtering module, the third end of the touch module is a touch point, and the touch module is used for providing the alternating current for the rectifying and filtering module;
the rectifying and filtering module comprises an input end and a touch voltage output node, and is used for receiving the alternating current through the input end, rectifying and filtering the alternating current, and then outputting voltage at the touch voltage output node so as to detect whether the touch point is contacted or not through the output voltage.
Optionally, the rectification and filtering module includes a rectification submodule, a filtering submodule, and a first node;
the rectifier sub-module comprises an input end, a first output end and a second output end, the input end of the rectifier sub-module is electrically connected with the second end of the touch module, the first output end of the rectifier sub-module is connected with the filter sub-module, the second output end of the rectifier sub-module is connected with the first node, and the first node is grounded; the rectifier module is used for receiving the alternating current through the input end, rectifying the alternating current and outputting the rectified alternating current through the first output end;
the filtering submodule comprises an input end, a touch voltage output node and an output end, the input end of the filtering submodule is electrically connected with the first output end of the rectifying submodule, and the output end of the filtering submodule is connected with the first node; the filtering submodule is used for receiving the rectified alternating current through the input end and outputting voltage at the touch voltage output node after filtering the rectified alternating current.
Optionally, the rectifier sub-module includes a first diode, a second diode, and a second node;
the first diode comprises an anode and a cathode, the anode of the first diode is connected with the second node, and the cathode of the first diode is connected with the input end of the filtering submodule;
the second diode comprises an anode and a cathode, the cathode of the second diode is connected with the second junction, and the anode of the second diode is connected with the first junction;
and the second end of the touch module is connected with the second node.
Optionally, the filtering submodule includes a first filtering unit, the touch voltage output node, and a second filtering unit;
the first filtering unit comprises a first end, a second end, a third end and a fourth end, the first end of the first filtering unit is electrically connected with the first output end of the rectifier module, the second end of the first filtering unit is connected with the touch voltage output node, the third end of the first filtering unit is electrically connected with the second filtering unit, and the fourth end of the first filtering unit is connected with the first node;
the second filtering unit comprises a first end, a second end and a third end, the first end of the second filtering unit is connected with the touch voltage output node, the second end of the second filtering unit is electrically connected with the third end of the first filtering unit, and the third end of the second filtering unit is connected with the first node.
Optionally, the first filtering unit is a low-pass filter, and the second filtering unit is a dc stabilizer.
Optionally, the first filtering unit includes a first resistor, a second resistor, a third node, and a fourth node, and the second filtering unit includes a first capacitor, a second capacitor, and a fifth node;
the first end of the first resistor is electrically connected with the first output end of the rectifier sub-module, and the second end of the second resistor is connected with the third junction;
the second resistor comprises a first end and a second end, the first end of the second resistor is connected with the third junction, and the second end of the second resistor is connected with the first junction;
the third resistor comprises a first end and a second end, the first end of the third resistor is connected with the third node through the fourth node, and the second end of the third resistor is connected with the touch voltage output node;
the first capacitor comprises a first end and a second end, the first end of the first capacitor is connected with the fourth node, and the second end of the first capacitor is connected with the fifth node;
the second capacitor comprises a first end and a second end, the first end of the second capacitor is connected with the touch voltage output node, the second end of the second capacitor is connected with the fifth node, and the fifth node is connected with the first node.
Optionally, the circuit further includes a voltage dividing module; the voltage division module comprises an input end and an output end, the input end of the voltage division module is electrically connected with the signal output end of the power management module, and the output end of the voltage division module is electrically connected with the first end of the touch module.
Optionally, the voltage dividing module includes a fourth resistor and a third capacitor;
the fourth resistor comprises a first end and a second end, the first end of the fourth resistor is electrically connected with the signal output end of the power management module, and the second end of the fourth resistor is electrically connected with the third capacitor;
the third capacitor comprises a first end and a second end, the first end of the third capacitor is electrically connected with the second end of the fourth resistor, and the second end of the third capacitor is electrically connected with the first end of the touch module.
In a second aspect, the present invention provides a touch sensor comprising a housing, the contact detection circuit of any one of the first aspect; and the touch point of the touch module in the contact detection circuit is convexly arranged on the outer side of the shell.
In a third aspect, the present invention provides a ring storage case, including a case body and a touch detection device, where the touch detection device includes the contact detection circuit according to any one of the first aspect.
According to the above technical solution, the touch detection circuit of the present invention includes: the device comprises a power management module, a touch module and a rectification filtering module; the power management module comprises a signal output end, the signal output end is electrically connected with the touch module, and the power management module is used for providing alternating current for the touch module; the touch module comprises a first end, a second end and a third end, the first end of the touch module is electrically connected with the power management module, the second end of the touch module is electrically connected with the rectifying and filtering module, the third end of the touch module is a touch point, and the touch module is used for providing the alternating current for the rectifying and filtering module; the rectifying and filtering module comprises an input end and a touch voltage output node, and is used for receiving the alternating current through the input end, rectifying and filtering the alternating current, and then outputting voltage at the touch voltage output node so as to detect whether the touch point is contacted or not through the output voltage. Therefore, touch detection can be realized by using a touch detection circuit comprising a power management module without a touch detection function, a touch module and a rectification filter module, and because the output signal of the power management module is power output, whether touch occurs can be directly judged according to the voltage output by a touch voltage output node, and a specific touch signal detection device is not required to be additionally adopted to detect the touch signal as in the prior art, so that the cost of touch detection is greatly reduced.
Further effects of the above-mentioned unconventional preferred modes will be described below in conjunction with specific embodiments.
Drawings
In order to more clearly illustrate the embodiments or the prior art solutions of the present invention, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments described in the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive labor.
FIG. 1 is a diagram illustrating the results of a touch detection circuit according to an embodiment of the present invention;
FIG. 2 is a block diagram of an embodiment of the present inventionSecond oneA schematic diagram of the results of the touch detection circuit;
FIG. 3 is a block diagram of an embodiment of the present inventionA thirdA schematic diagram of the results of the touch detection circuit;
FIG. 4 is a block diagram of an embodiment of the present inventionA fourthA schematic diagram of the results of a touch detection circuit.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be described in detail and completely with reference to the following embodiments and accompanying drawings. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In addition, the descriptions related to "first", "second", etc. in the present invention are for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.
In the prior art, a dedicated touch sensor chip is usually used for touch detection, but the dedicated touch sensor chip has high cost, does not have a power output function, and only has a touch signal output function, so that a specific touch signal detection device needs to be additionally used for detecting a touch signal, and the cost of the touch detection device is high. In addition, since the dedicated power management module only has a function of adjusting the power voltage, but does not have a function of detecting a touch, the touch detection by the power management module is not performed in the prior art.
The problem that the cost of a touch detection device is too high due to the fact that a specific touch signal detection device needs to be additionally adopted to detect touch signals in the prior art is solved. The invention provides a touch detection circuit, comprising: the device comprises a power management module, a touch module and a rectification filtering module; the first end of the touch module is electrically connected with the power management module, the second end of the touch module is electrically connected with the rectifying and filtering module, the third end of the touch module is a touch point, the touch module is used for providing the alternating current to the rectifying and filtering module, the rectifying and filtering module comprises an input end and a touch voltage output node, and the rectifying and filtering module is used for receiving the alternating current through the input end, rectifying and filtering the alternating current, and outputting voltage at the touch voltage output node so as to detect whether the touch point is contacted or not through the output voltage; that is, the voltage output by the touch voltage output node is used for reflecting whether the touch module makes contact or not. Therefore, the touch detection circuit comprising the power management module without a touch detection function, the touch module and the rectification filter module can be used for realizing touch detection, and because the output signal of the power management module is power output, whether touch occurs can be directly judged according to the voltage output by the touch voltage output node, and a specific touch signal detection device is not required to be additionally adopted to detect the touch signal as in the prior art, and because the cost of the power management module is lower than that of a special touch sensor chip, the cost of the touch detection is greatly reduced.
Next, a touch detection circuit provided in an embodiment of the present application will be described in detail with reference to the drawings.
Referring to fig. 1, a touch detection circuit in an embodiment of the invention is shown. As shown in fig. 1, the touch detection circuit 300 includes a power management module 100, a touch module 200, and a rectifying and filtering module 300. In this embodiment, the power management module 100 includes a signal output terminal, and the signal output terminal 100 is electrically connected to the touch module 200; the touch module 200 comprises a first end, a second end and a third end, the first end of the touch module 200 is electrically connected with the power management module 100, the second end of the touch module 200 is electrically connected with the rectifying and filtering module 300, and the third end of the touch module 200 is a touch point; the rectifying and filtering module 300 includes an input end and a touch voltage output node, and the input end of the rectifying and filtering module 300 is electrically connected to the second end of the touch module 200.
It should be noted that the power management module 100 in this embodiment is used to provide an alternating current to the touch module 200. In one implementation, the power management module 100 may be a chip with a fixed ac signal output, that is, a chip with a fixed voltage output and an ac current output, for example, a voltage output pin of the power management module 100 may be a fixed 5V voltage output, and it should be noted that the voltage output pin may also be other fixed voltage values output, for example, 6V, 7V, and a signal output end (for example, a connection inductance pin) of the power management module 100 outputs an ac current. In a specific implementation, the power management module 100 may be a power chip model number TPS6122X shown in fig. 2. It should be noted that, in order to ensure that the power management module 100 can fix the voltage output, in this embodiment, the feedback pin FB of the power management module 100 is connected to the voltage output pin VOUT of the power management module 100. The voltage output pin VOUT can output a fixed 5V voltage, and the connection inductor pin L outputs an alternating current.
In this embodiment, the touch module 200 may be configured to provide the ac current output by the power management module 100 to the rectifying and filtering module 300. When a touch event occurs in the touch module 200, for example, an appendage of a user makes contact with a third end (i.e., a touch point) of the touch module 200, or an object (e.g., a metal object, a plastic product, etc.) makes contact with the third end (i.e., the touch point) of the touch module 200, the touch module 200 acts as a capacitor in the circuit, and can shunt an ac current of a branch where the touch module 200 is located; when no touch event occurs at the third end (i.e., the touch point) of the touch module 200, for example, the limb of the user does not contact the third end (i.e., the touch point) of the touch module 200, or no object (such as a metal object, a plastic product, etc.) contacts the third end (i.e., the touch point) of the touch module 200, the touch module 200 is equivalently suspended in the circuit, and the ac current of the branch where the touch module 200 is located is not affected. Among them, in one possible implementation, the touch module 200 may be a touch metal lead.
Thus, when a touch event occurs at a third end (i.e., a touch point) of the touch module 200, since the touch module 200 shunts an ac current of a branch where the touch module 200 is located, both the voltage and the current of the rectifying and filtering module 300 change, and accordingly, the voltage output by the touch voltage output node also changes, for example, when the power management module 100 outputs a fixed voltage of 5V, if the touch module 200 does not generate a touch event, the voltage output by the touch voltage output node is 1.97V, and if the touch module 200 generates a touch event, the voltage output by the touch voltage output node is 1.53V; therefore, whether the touch module 200 touches or not can be determined according to the voltage output by the touch voltage output node, that is, in this embodiment, the voltage output by the touch voltage output node can be used to reflect whether the touch module 200 touches or not.
In this embodiment, the rectifying and filtering module 300 may be configured to receive an alternating current provided by the touch module 200 through an input terminal thereof, and rectify and filter the alternating current to output a voltage at a touch voltage output node, so as to detect whether the touch point is touched through the output voltage. That is, the rectifying and filtering module 300 may rectify and filter an incoming ac signal, that is, convert an ac current into a dc current, and filter a specific band of frequencies in the signal, so as to filter an interference signal in an output signal.
It can be understood that, in the present embodiment, the power management module 100, the touch module 200 and the rectifying and filtering module 300 without a touch detection function are connected to form a circuit touch detection circuit, which is equivalent to a touch sensor, so as to implement touch detection. Moreover, since the output signal of the power management module 100 is the power output, it can be directly determined whether a touch occurs according to the voltage output by the touch voltage output node, and it is not necessary to additionally use a specific touch signal detection device to detect the touch signal, as in the prior art, thereby greatly reducing the cost of touch detection.
Fig. 2 is a diagram showing only a basic embodiment of the touch detection circuit of the present invention, and based on the basic embodiment, certain optimization and expansion are performed, and other preferred embodiments of the touch detection circuit can also be obtained.
In one implementation manner of the present embodiment, as shown in fig. 3, the rectifying and filtering module 300 includes a rectifying sub-module 301, a filtering sub-module 302, and a first node a.
The rectifier sub-module 301 comprises an input end, a first output end and a second output end, the input end of the rectifier sub-module 301 is electrically connected to the second end of the touch module 200, the first output end of the rectifier sub-module 301 is connected to the filter sub-module 302, the second output end of the rectifier sub-module 301 is connected to the first node a, and the first node a is grounded.
The filtering submodule 302 comprises an input end, the touch voltage output node 400 and an output end, the input end of the filtering submodule 302 is electrically connected with the first output end of the rectifying submodule 301, and the output end of the filtering submodule 302 is connected with the first node a.
It should be noted that, the rectifier sub-module 301 is configured to receive an alternating current through an input end thereof, rectify the alternating current, and output the rectified alternating current through a first output end thereof, specifically, convert an incoming alternating current into a direct current (i.e., convert an alternating current signal into a direct current signal); the filtering submodule 302 is configured to receive the rectified ac current through an input terminal thereof, filter the rectified ac current, and output a voltage at the touch voltage output node 400, specifically, reduce an ac component in a pulsating dc signal output by the rectifying submodule 301, and retain a dc component thereof, so that a voltage ripple coefficient corresponding to the ac component is reduced, and a voltage waveform corresponding to the dc component becomes smoother.
In one implementation of the present embodiment, as shown in fig. 3, the rectifier sub-module 301 includes a first diode D1, a second diode D2, and a second node B.
Wherein the first diode D1 comprises an anode and a cathode, the anode of the first diode D1 is connected to the second node B, and the cathode of the first diode is connected to the input terminal of the filter submodule 302; the second diode D2 includes an anode and a cathode, the cathode of the second diode D2 is connected to the second node B, and the anode of the second diode D2 is connected to the first node B; a second end of the touch module 200 is connected to the second node B. It should be noted that, in an implementation manner of the present embodiment, the models of the first diode D1 and the second diode D2 may be SD101AWS 1.
In one implementation of the present embodiment, as shown in fig. 3, the filtering submodule 302 includes a first filtering unit 3021, a touch voltage output node 400, and a second filtering unit 3022.
The first filtering unit 3021 includes a first end, a second end, a third end and a fourth end, the first end of the first filtering unit 3021 is electrically connected to the first output end of the rectifier sub-module 301, the second end of the first filtering unit 3021 is connected to the touch voltage output node 400, the third end of the first filtering unit 3021 is electrically connected to the second filtering unit 3022, and the fourth end of the first filtering unit 3021 is connected to the first node a.
The second filtering unit 3022 includes a first terminal, a second terminal and a third terminal, the first terminal of the second filtering unit 3022 is connected to the touch voltage output node 400, the second terminal of the second filtering unit 3022 is electrically connected to the third terminal of the first filtering unit 3021, and the third terminal of the second filtering unit 3022 is connected to the first node a.
It should be noted that the first filtering unit 3021 is configured to allow signals below the cutoff frequency to pass, but not allow signals above the cutoff frequency to pass, so that the voltage waveform corresponding to the signals becomes smoother, for example, in one possible implementation, the first filtering unit 3021 may be a low-pass filter; the second filtering unit 3022 is configured to reduce an ac component of the pulsating dc signal output by the rectifier sub-module 301 and retain a dc component thereof, i.e., stabilize the dc signal, for example, in one possible implementation, the second filtering unit 3022 may be a dc stabilizer.
In one possible implementation manner, as shown in fig. 3, the first filtering unit 3021 may include a first resistor R1, a second resistor R2, a third resistor R3, a third node C, and a fourth node D, and the second filtering unit 3022 includes a first capacitor C1, a second capacitor C2, and a fifth node E.
The first resistor R1 includes a first terminal and a second terminal, the first terminal of the first resistor R1 is electrically connected to the first output terminal of the rectifier module 301, and the second terminal of the second resistor R2 is connected to the third node C.
The second resistor R2 comprises a first end and a second end, the first end of the second resistor R2 is connected with the third node C, and the second end of the second resistor R2 is connected with the first node A;
the third resistor R3 includes a first end and a second end, the first end of the third resistor R3 is connected to the third node C through the fourth node D, that is, the first end of the third resistor R3 is connected to the fourth node D, and the fourth node is connected to the third node C; a second terminal of the third resistor R3 is connected to the touch voltage output node 400.
The first capacitor C1 includes a first terminal and a second terminal, the first terminal of the first capacitor C1 is connected to the fourth node D, and the second terminal of the first capacitor D is connected to the fifth node E.
The second capacitor C2 includes a first terminal and a second terminal, the first terminal of the second capacitor C2 is connected to the touch voltage output node 400, the second terminal of the second capacitor C2 is connected to the fifth node E, and the fifth node E is connected to the first node a.
It should be noted that, in an implementation manner of the present embodiment, the resistance value of the first resistor R1 may be different from the resistance values of the second resistor R2 and the third resistor R3, for example, the resistance value of the first resistor R1 may be 91K Ω, the resistance value of the second resistor R2 may be 1M Ω, and the resistance value of the third resistor R3 may be 1M Ω; the capacitance of the first capacitor C1 and the capacitance of the second capacitor C2 may be different, for example, the capacitance of the first capacitor C1 may be 1nF, and the capacitance of the second capacitor C2 may be 2.2 nF; it can be understood that after the first capacitor C1 and the second capacitor C2 with different capacitance values are provided, the interference signals of different frequency bands can be filtered through the first capacitor C1 and the second capacitor C2, respectively, so as to stably filter the interference signals of the middle and low frequency bands that affect the input signal, and improve the stability of the voltage of the output signal.
Fig. 2 is a diagram showing only a basic embodiment of the touch detection circuit of the present invention, and based on the basic embodiment, certain optimization and expansion are performed, and other preferred embodiments of the touch detection circuit can also be obtained.
Fig. 4 shows another embodiment of the touch detection circuit according to the present invention. In this embodiment, on the basis of the corresponding embodiment in fig. 2, the touch detection circuit further includes a voltage division module 500. The voltage dividing module 500 includes an input end and an output end, the input end of the voltage dividing module 500 is electrically connected to the signal output end of the power management module 100, and the output end of the voltage dividing module 500 is electrically connected to the first end of the touch module 100. It should be noted that the voltage dividing module 500 is used for dividing the voltage of the branch where the voltage dividing module is located, so as to stabilize the signal output.
In an implementation manner of this embodiment, as shown in fig. 3, the voltage dividing module 500 may include a fourth resistor R4 and a third capacitor C3. The fourth resistor R4 includes a first end and a second end, the first end of the fourth resistor R4 is electrically connected to the signal output end of the power management module 100, and the second end of the fourth resistor R4 is connected to the third capacitor C3; the third capacitor C3 includes a first terminal and a second terminal, the first terminal of the third capacitor C3 is electrically connected to the second terminal of the fourth resistor R4, and the second terminal of the third capacitor C3 is electrically connected to the first terminal of the touch module 200. The fourth resistor R4 is used to limit the current of the passing signal, so as to avoid the situation that the alternating current flowing out of the fourth resistor R4 is too large, which causes the breakdown of the capacitor or the diode behind the fourth resistor R4; the third capacitor C3 is used to allow only ac current to pass, i.e. to ensure that the signal passing through the third capacitor C3 is ac current.
It should be noted that, in an implementation manner of the present embodiment, the resistance of the fourth resistor R4 may be 10K Ω and the capacitance of the third capacitor C3 may be 1 pF.
Based on the same inventive concept, the invention also provides a touch sensor, which comprises a shell and a contact detection circuit; the structure of the touch detection circuit can refer to the structure of the touch detection circuit in any of the above embodiments, and is not described herein again. It should be noted that the touch point of the touch module in the contact detection circuit is protruded outside the housing, where the outside of the housing can be understood as the side of the housing opposite to the contact detection circuit, so that when an object or a human body contacts the touch point, it can be detected that the touch sensor touches.
Based on the same inventive concept, the invention further provides a ring storage box, which comprises a box body and a touch detection device, wherein the touch detection device comprises a contact detection circuit, and the structure of the contact detection circuit can refer to the structure of the contact detection circuit in any embodiment, and is not repeated herein. It should be good, because the technical scheme of above-mentioned contact detection circuit has been adopted to the ring receiver of this embodiment, therefore this ring receiver has all beneficial effects of above-mentioned contact detection circuit.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the claims. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.
When introducing elements of various embodiments of the present application, the articles "a," "an," "the," and "said" are intended to mean that there are one or more of the elements. The terms "comprising," "including," and "having" are intended to be inclusive and mean that there may be additional elements other than the listed elements.
The embodiments in the present specification are described in a progressive manner, and the same and similar parts among the embodiments are referred to each other, and each embodiment focuses on the differences from the other embodiments. In particular, for the apparatus embodiment, since it is substantially similar to the method embodiment, it is relatively simple to describe, and reference may be made to some descriptions of the method embodiment for relevant points. The above-described embodiments of the apparatus are merely illustrative, and the units and units described as separate parts may or may not be physically separate. In addition, some or all of the units and units can be selected according to actual needs to achieve the purpose of the scheme of the embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.
The foregoing is directed to embodiments of the present application and it is noted that numerous modifications and adaptations may be made by those skilled in the art without departing from the principles of the present application and are intended to be within the scope of the present application.
Claims (10)
1. A touch detection circuit, characterized in that the touch detection circuit comprises: the device comprises a power management module, a touch module and a rectification filtering module;
the power management module comprises a signal output end, the signal output end is electrically connected with the touch module, and the power management module is used for providing alternating current for the touch module;
the touch module comprises a first end, a second end and a third end, the first end of the touch module is electrically connected with the power management module, the second end of the touch module is electrically connected with the rectifying and filtering module, the third end of the touch module is a touch point, and the touch module is used for providing the alternating current for the rectifying and filtering module;
the rectifying and filtering module comprises an input end and a touch voltage output node, and is used for receiving the alternating current through the input end, rectifying and filtering the alternating current, and then outputting voltage at the touch voltage output node so as to detect whether the touch point is contacted or not through the output voltage.
2. The circuit of claim 1, wherein the rectifying-filtering module comprises a rectifying submodule, a filtering submodule, and a first node;
the rectifier sub-module comprises an input end, a first output end and a second output end, the input end of the rectifier sub-module is electrically connected with the second end of the touch module, the first output end of the rectifier sub-module is connected with the filter sub-module, the second output end of the rectifier sub-module is connected with the first node, and the first node is grounded; the rectifier module is used for receiving the alternating current through the input end, rectifying the alternating current and outputting the rectified alternating current through the first output end;
the filtering submodule comprises an input end, a touch voltage output node and an output end, the input end of the filtering submodule is electrically connected with the first output end of the rectifying submodule, and the output end of the filtering submodule is connected with the first node; the filtering submodule is used for receiving the rectified alternating current through the input end and outputting voltage at the touch voltage output node after filtering the rectified alternating current.
3. The circuit of claim 2, wherein the rectifier module comprises a first diode, a second diode, and a second junction;
the first diode comprises an anode and a cathode, the anode of the first diode is connected with the second node, and the cathode of the first diode is connected with the input end of the filtering submodule;
the second diode comprises an anode and a cathode, the cathode of the second diode is connected with the second junction, and the anode of the second diode is connected with the first junction;
and the second end of the touch module is connected with the second node.
4. The circuit of claim 2, wherein the filter submodule comprises a first filter unit, the touch voltage output node, and a second filter unit;
the first filtering unit comprises a first end, a second end, a third end and a fourth end, the first end of the first filtering unit is electrically connected with the first output end of the rectifier module, the second end of the first filtering unit is connected with the touch voltage output node, the third end of the first filtering unit is electrically connected with the second filtering unit, and the fourth end of the first filtering unit is connected with the first node;
the second filtering unit comprises a first end, a second end and a third end, the first end of the second filtering unit is connected with the touch voltage output node, the second end of the second filtering unit is electrically connected with the third end of the first filtering unit, and the third end of the second filtering unit is connected with the first node.
5. The circuit of claim 4, wherein the first filtering unit is a low pass filter and the second filtering unit is a DC stabilizer.
6. The circuit of claim 4, wherein the first filtering unit comprises a first resistor, a second resistor, a third node, and a fourth node, and the second filtering unit comprises a first capacitor, a second capacitor, and a fifth node;
the first end of the first resistor is electrically connected with the first output end of the rectifier sub-module, and the second end of the second resistor is connected with the third junction;
the second resistor comprises a first end and a second end, the first end of the second resistor is connected with the third junction, and the second end of the second resistor is connected with the first junction;
the third resistor comprises a first end and a second end, the first end of the third resistor is connected with the third node through the fourth node, and the second end of the third resistor is connected with the touch voltage output node;
the first capacitor comprises a first end and a second end, the first end of the first capacitor is connected with the fourth node, and the second end of the first capacitor is connected with the fifth node;
the second capacitor comprises a first end and a second end, the first end of the second capacitor is connected with the touch voltage output node, the second end of the second capacitor is connected with the fifth node, and the fifth node is connected with the first node.
7. The circuit of any one of claims 1-6, further comprising a voltage divider module; the voltage division module comprises an input end and an output end, the input end of the voltage division module is electrically connected with the signal output end of the power management module, and the output end of the voltage division module is electrically connected with the first end of the touch module.
8. The circuit of claim 7, wherein the voltage divider module comprises a fourth resistor and a third capacitor;
the fourth resistor comprises a first end and a second end, the first end of the fourth resistor is electrically connected with the signal output end of the power management module, and the second end of the fourth resistor is electrically connected with the third capacitor;
the third capacitor comprises a first end and a second end, the first end of the third capacitor is electrically connected with the second end of the fourth resistor, and the second end of the third capacitor is electrically connected with the first end of the touch module.
9. A touch sensor comprising a housing, the contact detection circuit of any of claims 1-8; and the touch point of the touch module in the contact detection circuit is convexly arranged on the outer side of the shell.
10. A ring storage case comprising a case body and a touch detection device, wherein the touch detection device comprises the contact detection circuit according to any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911354419.6A CN111103488A (en) | 2019-12-25 | 2019-12-25 | Touch detection circuit, touch sensor and ring receiver |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911354419.6A CN111103488A (en) | 2019-12-25 | 2019-12-25 | Touch detection circuit, touch sensor and ring receiver |
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| CN111103488A true CN111103488A (en) | 2020-05-05 |
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| CN201911354419.6A Pending CN111103488A (en) | 2019-12-25 | 2019-12-25 | Touch detection circuit, touch sensor and ring receiver |
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| CN108228010A (en) * | 2016-12-13 | 2018-06-29 | 佛山市顺德区美的电热电器制造有限公司 | Capacitance touch induced key detection circuit and method and household electrical appliance |
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| CN101681221A (en) * | 2008-03-28 | 2010-03-24 | 索尼株式会社 | Display device provided with touch sensor |
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Application publication date: 20200505 |