Capacitor signal acquisition device and electronic equipment

Abstract

The utility model provides a capacitor signal acquisition device and electronic equipment, and relates to the technical field of electronic equipment.The capacitor signal acquisition device acquires capacitor signals of a tested capacitor through a signal preprocessing circuit and a capacitance sensor chip, and sends the acquired capacitor signals to a microprocessor; the microprocessor sends a processing result to an upper computer through a wireless signal transmitter, and the microprocessor communicates with the upper computer through a wireless network, so that the capacitor signal acquisition device and the upper computer are not of an integrated structure, and the detected capacitor data does not need to be limited to local hardware processing. Remote transmission of data of the tested capacitor is realized, so that a user can check related data of the tested capacitor more conveniently.

Description

TECHNICAL FIELD

[0001] The utility model relates to electronic equipment technical field, concretely relates to a capacitor signal acquisition device and electronic equipment. BACKGROUND

[0002] Figure 1 For the structure diagram of capacitor signal acquisition device provided in the prior art, it comprises a detection part and a single-chip microcomputer, wherein the detection part collects capacitor signals through a sensing plane, the collected capacitor signals are processed by an FDC2214 / FDC2114 capacitor sensing chip, then sent to an ADC conversion circuit for ADC conversion, and the conversion result is sent to an MCU processor, and the MCU sends the processing result to a man-machine interaction part for display. The existing capacitor signal acquisition device can only collect single-dimensional data, this device uses a capacitive sensing plane as an input signal, a single FDC2214 / FDC2114 processes and converts the input signal, and an MCU processes the data to obtain a specific gesture result and display it on an LCD screen of the man-machine interaction part. SUMMARY

[0003] Therefore, the utility model embodiment provides a capacitor signal acquisition device and electronic equipment, so that the measured capacitor data is not limited to local hardware processing, realizes remote transmission of the measured capacitor data, and enables users to conveniently view the relevant data of the measured capacitor.

[0004] To achieve the above object, the utility model embodiment provides the following technical scheme:

[0005] A capacitor signal acquisition device comprises:

[0006] A signal preprocessing circuit is connected to the measured capacitor and used to collect capacitor signals of the measured capacitor.

[0007] A capacitive sensor chip is connected to the output end of the signal preprocessing circuit.

[0008] A microprocessor is connected to the output end of the capacitive sensor chip.

[0009] A wireless signal transmitter is connected to the output end of the microprocessor and used to send the output signal of the microprocessor to an upper computer.

[0010] Optionally, in the capacitor signal acquisition device, the number of the capacitor sensor chips is N, each capacitor sensor chip has M channel interfaces, each channel interface corresponds to a signal pre-processing circuit, and N and M are positive integers not less than 1.

[0011] Optionally, in the capacitor signal acquisition device, the wireless signal transmitter is a Bluetooth signal transmission module.

[0012] Optionally, in the capacitor signal acquisition device, the capacitor signal acquisition device further comprises:

[0013] a flexible battery, which is configured to provide working power for the power-consuming elements in the capacitor signal acquisition device.

[0014] Optionally, in the capacitor signal acquisition device, the shell of the capacitor signal acquisition device is provided with a program download interface, a charging interface and a debugging interface.

[0015] The program download interface and the debugging interface are connected to the microprocessor.

[0016] The charging interface is connected to a power module in the capacitor signal acquisition device.

[0017] Optionally, in the capacitor signal acquisition device, the shell is a flexible shell.

[0018] Optionally, in the capacitor signal acquisition device, the shell is a glove-shaped shell, and the measured capacitor is arranged on the side of the glove-shaped shell facing the palm.

[0019] Optionally, in the capacitor signal acquisition device, the signal pre-processing circuit, the capacitor sensor chip, the microprocessor and the wireless signal transmitter are integrated on a flexible circuit board.

[0020] An electronic device comprising the capacitor signal acquisition device described in any one of the preceding embodiments and an upper computer interacting with the microprocessor through the wireless signal transmitter.

[0021] Optionally, in the electronic device, the upper computer is a mobile phone or glasses with display function.

[0022] Based on the above technical scheme, the capacitor signal of the measured capacitor is collected by the signal preprocessing circuit and the capacitor sensor chip, and the collected capacitor signal is sent to the microprocessor, and the microprocessor sends the processing result to the upper computer through the wireless signal transmitter, since the microprocessor and the upper computer communicate through the wireless network, therefore, the capacitor signal collection device and the upper computer are not an integral structure, therefore, the measured capacitor data does not need to be limited to local hardware processing, realizing the remote transmission of the measured capacitor data, so that the user can more conveniently view the related data of the measured capacitor. BRIEF DESCRIPTION OF DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiment or the prior art description. Obviously, the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor on the basis of the provided drawings.

[0024] Figure 1 It is a structural schematic diagram of the capacitor signal collection device in the prior art;

[0025] Figure 2 It is a structural schematic diagram of the capacitor signal collection device provided by the embodiment of the present application;

[0026] Figure 3 It is a structural schematic diagram of the capacitor sensor chip in the capacitor signal collection device provided by the embodiment of the present application;

[0027] Figure 4 It is a layout mode schematic diagram of the capacitor signal collection device provided by the embodiment of the present application. DETAILED DESCRIPTION

[0028] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0029] Referring to Figure 2 The embodiment of the present application discloses a capacitor signal collection device, which comprises a signal preprocessing circuit 10, a capacitor sensor chip 20, a microprocessor 30 and a wireless signal transmitter 40.

[0030] Figure 2The measured capacitance in the above-mentioned embodiment can be self-capacitance, mutual-capacitance or differential capacitance. The self-capacitance is measured by measuring the capacitance change between a single pin and a power supply ground. When a finger touches, the system capacitance increases, resulting in a voltage change, so that the touch behavior is detected. The mutual-capacitance sensor detects the mutual-capacitance change between a transmitting electrode (TX) and a receiving electrode (RX). When a finger approaches, the electric field between the electrodes is disturbed, resulting in a decrease in the amount of charge at the receiving end.

[0031] The signal pre-processing circuit 10 is connected to the measured capacitor, and is configured to collect the capacitor signal output by the measured capacitor. In the embodiment, the signal pre-processing circuit has a capacitor-inductor oscillation circuit connected to the measured capacitor. When the measured capacitor changes due to user touch or other behaviors, the measured capacitor generates a high-frequency alternating current signal. The greater the variable of the measured capacitor, the more drastic the change of the high-frequency alternating current signal. By detecting the high-frequency alternating current signal, the variable degree of the measured capacitor, such as the pressing force, can be obtained.

[0032] The input end of the capacitive sensor chip 20 is connected to the output end of the signal pre-processing circuit. In the embodiment, the type of the capacitive sensor chip 20 can be selected according to user needs. For example, refer to Figure 3 In the technical solution disclosed in the embodiment, the capacitive sensor chip 20 can be an FDC2214 / FDC2114 chip. Figure 3 The FDC2214 / FDC2114 chip has a miniaturized structure, so the specific structure of the FDC2214 / FDC2114 chip is not described in the present application. Each FDC2214 / FDC2114 chip can collect capacitor signals of four channels. The FDC2214 / FDC2114 chip can measure the change of the measured capacitor by detecting the high-frequency alternating current signal output by the capacitor-inductor oscillation circuit, convert the high-frequency alternating current signal into a digital signal through an internal ADC circuit, and output the digital signal to the microprocessor 30 through an IIC protocol or other communication protocol.

[0033] Refer to Figure 3 The external resonant frequency measured by the FDC2214 / FDC2114 is:

[0034] ;

[0035] In the above-mentioned embodiment, the measured capacitor is connected to the signal pre-processing circuit, and the signal pre-processing circuit is configured to collect the capacitor signal output by the measured capacitor. In the embodiment, the signal pre-processing circuit has a capacitor-inductor oscillation circuit connected to the measured capacitor. When the measured capacitor changes due to user touch or other behaviors, the measured capacitor generates a high-frequency alternating current signal. The greater the variable of the measured capacitor, the more drastic the change of the high-frequency alternating current signal. By detecting the high-frequency alternating current signal, the variable degree of the measured capacitor, such as the pressing force, can be obtained. FDC214 is the output frequency value, L is the inductance in the capacitor inductance oscillation circuit, C is the total capacitance of the fixed capacitance in the capacitor inductance oscillation circuit and the measured capacitor connected, wherein the LC oscillation circuit (capacitor inductance oscillation circuit) composed of L and C in the circuit board is used to generate the excitation signal (high-frequency alternating current signal).

[0036] That is, C = C plate + C measured, wherein C plate is the capacitance in the capacitor inductance oscillation circuit, and C measured is the measured capacitor.

[0037] The output frequency value is calculated by the FDC2214 / FDC2114 design system:

[0038]

[0039] It can be concluded that:

[0040] Regarding the microprocessor 30, the input end of the microprocessor is connected with the output end of the capacitance sensor chip. The microprocessor is the core component of the capacitor signal acquisition device, and the type thereof can be selected according to design requirements. For example, in the embodiment, the STC8A8K64D4 master control chip can be used as the microprocessor 30 in the application. The signal output from the capacitance sensor chip FDC2214 / FDC2114 to the microprocessor after conversion is a frequency value, and the microprocessor is needed to convert the frequency value into a specific capacitance value. After the microprocessor obtains the frequency value f output by the capacitance sensor chip FDC2214 / FDC2114, the formula is solved to calculate the measured value C measured of the measured capacitor. The data is transmitted to the wireless signal transmitter 40 through the serial port.

[0041] The input end of the wireless signal transmitter 40 is connected with the output end of the microprocessor, and the wireless signal transmitter is used to send the output signal of the microprocessor to the host computer. In the embodiment, the type of the wireless signal transmitter 40 can be selected according to user requirements, as long as it can communicate with the host computer wirelessly. For example, in the technical solution disclosed in the embodiment, the microprocessor and the host computer can use Bluetooth transmission mode to interact with each other, and at this time, the capacitor signal acquisition device and the host computer can be considered as two separate devices.

[0042] From the above scheme can be seen, the application is through the signal pre-processing circuit and the capacitor sensor chip for collecting the capacitor signal of the measured capacitor, the collected capacitor signal is sent to the microprocessor, the microprocessor sends the processing result to the host computer through the wireless signal transmitter, since the microprocessor and the host computer communicate through the wireless network, therefore, the capacitor signal acquisition device and the host computer are not an integral structure, therefore, the measured capacitor data does not need to be limited to local hardware processing, realizes the remote transmission of the measured capacitor data, so that the user can more conveniently view the relevant data of the measured capacitor.

[0043] In the embodiment, the number of measured capacitors required to be monitored is different, and the number of capacitor sensor chips configured in the capacitor signal acquisition device is also different. In the embodiment, the number of capacitor sensor chips is N, each capacitor sensor chip has M channel interfaces, each channel interface corresponds to a signal pre-processing circuit, and N and M are positive integers not less than 1. Taking the FDC2214 / FDC2114 chip as an example, the capacitor signal acquisition device can have three FDC2214 / FDC2114 chips, each FDC2214 / FDC2114 chip can provide four channels of signals, at this time, the capacitor signal acquisition device can detect the capacitor signals of 12 measured capacitors.

[0044] The power consumption elements in the capacitor signal acquisition device include a capacitor sensor chip, a microprocessor and a wireless signal transmitter. The working voltages required by the capacitor sensor chip, the microprocessor and the wireless signal transmitter can be different. For example, the working voltage required by the capacitor sensor chip can be 3.3 V, the working voltage required by the microprocessor can be 5 V, and the voltage required by the wireless signal transmitter can be 5 V. The output voltage of the power module of the capacitor signal acquisition device can be adjusted by a voltage regulating circuit to provide an appropriate working voltage for each power consumption element. In this embodiment, the power module can be a lithium battery, and the output voltage of the lithium battery can be 3.7 V. The output voltage of the lithium battery is boosted to a first target voltage by a boost circuit (such as a PS3120A circuit), and the first target voltage is the working voltage of the microprocessor and the wireless signal transmitter. Then, the first target voltage is stabilized to a second target voltage by a voltage stabilizing circuit (such as an AMS1117), and the second target voltage is the working voltage of the capacitor sensor chip. In this embodiment, a filter capacitor can be provided on the power module to filter out high-frequency noise and low-frequency noise. The filter capacitor can be a 0.1 µF and 10 µF capacitor. The 0.1 µF and 10 µF capacitors filter out high-frequency noise and low-frequency noise in the power module, respectively, to decouple the power supply of the power module. Star grounding and partial division of the power supply layer and the ground layer for each capacitor sensor chip are used to reduce crosstalk and improve the anti-interference ability of the signal.

[0045] In the technical solution disclosed in this embodiment, the capacitor signal acquisition device can be a wearable device. Therefore, to facilitate user wearing, the battery module can be a flexible battery that can automatically bend according to the shape of the wearing position, or a small button battery. As long as the battery module does not affect user movement, it is acceptable.

[0046] In the technical solution disclosed in this embodiment, the housing of the capacitor signal acquisition device is provided with a program download interface, a charging interface and a debugging interface. The program download interface and the debugging interface are connected to the microprocessor for updating the program in the microprocessor and debugging the installed program. The charging interface is connected to the power module in the capacitor signal acquisition device for charging the power module.

[0047] Furthermore, when the capacitor signal acquisition device is a portable device (such as a smart wristband, smart glove, etc.), the housing is a flexible housing so that it fits snugly against the wearing part. When the capacitor signal acquisition device is a smart glove, the housing is a glove-shaped housing with a length of 69.1 mm and a width of 43.3 mm. When the capacitor signal acquisition device is a smart wristband, the housing is a wristband-shaped housing, and the capacitor to be measured is located on the side of the glove-shaped housing / wristband-shaped housing facing the palm.

[0048] In this embodiment, the signal preprocessing circuit, the capacitance sensor chip, the microprocessor, and the wireless signal transmitter are integrated on a flexible circuit board, so that the capacitor signal acquisition device can freely change shape.

[0049] like Figure 4 As shown, this application also provides a layout schematic diagram of a capacitor signal acquisition device, see [link to schematic diagram]. Figure 4 The capacitor signal acquisition device has nine capacitor interfaces, three capacitance sensor chips 20, a program download interface, a battery interface, a reset button, a debugging interface, a microprocessor 30, and a wireless signal transmitter 40. The device can simultaneously detect nine capacitors under test.

[0050] Corresponding to the above-mentioned capacitor signal acquisition device, this application also provides an electronic device, which uses any of the above-mentioned capacitor signal acquisition devices, and a host computer that interacts with the microprocessor through a wireless signal transmitter.

[0051] In this embodiment, the host computer is a mobile phone or glasses with a display function. At this time, the signal of the capacitor under test can be processed by the mobile phone or smart glasses. The processing includes, but is not limited to, displaying image information or other instruction data that matches the triggering mode of the capacitor under test.

[0052] For ease of description, the above system is described by dividing it into various modules based on their functions. Of course, in implementing this utility model, the functions of each module can be implemented in one or more software and / or hardware components.

[0053] The various embodiments described in the specification can be presented with respect to a progressive manner, and the same or similar parts among the various embodiments can be mutually referred to, and each embodiment focuses on the difference from other embodiments. The above-described system and system embodiments are merely illustrative, and the units described as separate components can be or can not be physically separated, and the components shown as units can be or can not be physical units, i.e., can be located in one place or can be distributed to multiple network units. Part or all of the modules can be selected to achieve the purpose of the embodiment according to actual needs. Those skilled in the art can understand and implement without creative labor.

[0054] The skilled person can further realize that the units and algorithm steps of the examples described in conjunction with the embodiments disclosed herein can be realized in electronic hardware, computer software or a combination of both. In order to clearly illustrate the interchangeability of hardware and software, the components and steps of the examples have been described in the above description in general terms. Whether the functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. The skilled person can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of the present application.

[0055] The steps of the methods or algorithms described in conjunction with the embodiments disclosed herein can be directly implemented in hardware, software modules executed by a processor, or a combination of both. The software modules can be placed in random access memory (RAM), memory, read-only memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, hard disks, removable disks, CD-ROMs, or any other form of storage medium known in the art.

[0056] It should also be noted that, in this document, relational terms such as first and second, and the like, are used solely to distinguish one entity or action from another entity or action, without necessarily requiring or implying any such actual relationship or order between such entities or actions. Moreover, the terms "comprising", "including", or any other variant thereof are intended to cover non-exclusive inclusion, such that a process, method, article or apparatus that comprises a list of elements does not include only those elements recited, but can also include other elements not expressly listed or inherent to such process, method, article or apparatus. Without more limitations, an element defined by the phrase "comprising a" does not exclude the presence of additional identical elements in the process, method, article or apparatus that includes the element.

[0057] The above description of disclosed embodiments enables one of ordinary skill in the art to make or use the application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein can be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A capacitor signal acquisition device, characterized in that, include: A signal preprocessing circuit, which is connected to the capacitor under test, is used to acquire the capacitor signal of the capacitor under test. A capacitive sensor chip, wherein the input terminal of the capacitive sensor chip is connected to the output terminal of the signal preprocessing circuit; A microprocessor, wherein the input terminal of the microprocessor is connected to the output terminal of the capacitive sensor chip; A wireless signal transmitter, wherein the input terminal of the wireless signal transmitter is connected to the output terminal of the microprocessor, and the wireless signal transmitter is used to send the output signal of the microprocessor to a host computer.

2. The capacitor signal acquisition device according to claim 1, characterized in that, The number of capacitive sensor chips is N, and each capacitive sensor chip has M channel interfaces. Each channel interface corresponds to a signal preprocessing circuit, and N and M are both positive integers not less than 1.

3. The capacitor signal acquisition device according to claim 1, characterized in that, The wireless signal transmitter is a Bluetooth signal transmission module.

4. The capacitor signal acquisition device according to claim 1, characterized in that, Also includes: A flexible battery is used to provide operating power for the electrical components in the capacitor signal acquisition device.

5. The capacitor signal acquisition device according to claim 1, characterized in that, The housing of the capacitor signal acquisition device is equipped with a program download interface, a charging interface, and a debugging interface. The program download interface and the debug interface are connected to the microprocessor; The charging interface is connected to the power module in the capacitor signal acquisition device.

6. The capacitor signal acquisition device according to claim 5, characterized in that, The shell is a flexible shell.

7. The capacitor signal acquisition device according to claim 6, characterized in that, The housing is a glove-shaped housing, and the capacitor under test is disposed on the side of the glove-shaped housing facing the palm.

8. The capacitor signal acquisition device according to claim 1, characterized in that, The The signal preprocessing circuit, capacitive sensor chip, microprocessor, and wireless signal transmitter are integrated on a flexible circuit board.

9. An electronic device, characterized in that, It includes the capacitor signal acquisition device according to any one of claims 1-8, and a host computer that interacts with the microprocessor via a wireless signal transmitter.

10. The electronic device according to claim 9, characterized in that, The host computer is a mobile phone or glasses with a display function.

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