CN111245419A - a key circuit - Google Patents

Abstract

The present application provides a button circuit, which includes a first displacement sensor, a detected object, a button, a voltage comparator and a switch circuit. The detected object is displaced with the state of the button, and the first displacement sensor uses for sensing whether the detected object is displaced, and converting the displacement of the detected object into a first voltage; the output end of the first displacement sensor is connected to the first input end of the voltage comparator , the voltage comparator is used to determine the level signal output by itself according to the first voltage output by the first displacement sensor, so that the switch circuit between the power supply and the output end of the key circuit is in a conducting state ; The output end of the button circuit outputs a button signal when the switch circuit is in a conducting state. In the implementation of the present application, the button does not need to be in contact with the printed circuit board, but the effect of the button being connected to the circuit can be achieved, which is beneficial to the maintenance of the button and the circuit board during use.

Description

a key circuit

technical field

The present application relates to the field of electronic technology, in particular to a key circuit.

Background technique

A key is a common control electrical component used to connect or disconnect a circuit, so that an electronic device can achieve a certain function, such as increasing the volume, turning on or off the electronic device, and so on.

In the prior art, the buttons and the circuit are in a connection relationship. The buttons are welded to the printed circuit board PCB, or the buttons are welded to the PCB through wires, etc. The prior art solutions are all connected by the buttons and the circuit board. In order to realize the key access circuit, the existing technical solution will bring about the problem of difficulty in key maintenance.

SUMMARY OF THE INVENTION

Based on the above problems, the present application provides a key circuit, the key does not need to be in contact with the printed circuit board, but can achieve the effect of the key being connected to the circuit, which is beneficial to the maintenance of the key and the circuit board during use.

An embodiment of the present application provides a button circuit, the button circuit includes a first displacement sensor, a detected object, a button, a voltage comparator, and a switch circuit, and the detected object is displaced as the state of the button changes ,in:

The first displacement sensor is used to sense whether the detected object is displaced, and convert the displacement of the detected object into a first voltage amount;

The output end of the first displacement sensor is connected to the first input end of the voltage comparator, and the voltage comparator is used to determine the level signal output by itself according to the first voltage output by the first displacement sensor, so that The switch circuit between the power supply and the output end of the key circuit is in a conducting state;

The output end of the key circuit outputs a key signal when the switch circuit is in a conducting state.

Further, the button circuit also includes a second displacement sensor;

The output end of the second displacement sensor is connected to the second input end of the voltage comparator, the second displacement sensor is used to sense whether the detected object is displaced, and the displacement of the detected object The quantity is converted into a second voltage quantity, wherein the first displacement sensor and the second displacement sensor are on the horizontal line of the pressing direction of the key, and are respectively located on both sides of the detected object.

In a possible implementation, the voltage comparator is used to:

When the magnitude of the first voltage output by the first displacement sensor is equal to the magnitude of the second voltage output by the second displacement sensor, the output voltage is zero;

When the magnitude of the first voltage output by the first displacement sensor is not equal to the magnitude of the second voltage output by the second displacement sensor, a non-zero voltage that keeps the switch circuit in an on state is output.

In a possible embodiment, the first displacement sensor is a photoelectric displacement sensor, and the detected object is a non-transparent object.

In another possible embodiment, the first displacement sensor is an inductive displacement sensor, and the detected object is a metal conductor.

Optionally, when the state of the button is not pressed, the magnitude of the first voltage output by the first displacement sensor and the second voltage output by the second displacement sensor are equal in magnitude.

In a possible implementation manner, the detected object is mechanically connected to the key through an elastic object.

Optionally, the switch circuit is a field effect transistor, the gate of the field effect transistor is connected to the output end of the voltage comparator, the drain of the field effect transistor is connected to the power supply, and the The source is connected to the output end of the key circuit.

In a second aspect, an embodiment of the present application further provides an electrical device, where the electronic device includes the circuit included in the first aspect or any of the possible embodiments.

The button circuit in this application includes a displacement sensor, a detected object, a button, a voltage comparator and a switch circuit, the detected object is displaced with the state change of the button, and the displacement sensor is used to sense the Whether the detected object is displaced, and convert the displacement of the detected object into a voltage; the output end of the displacement sensor is connected to the input end of the voltage comparator, and the voltage comparator is used to measure the displacement according to the displacement The amount of voltage output by the sensor determines the level signal output by itself, so that the switch circuit between the power supply and the output end of the button circuit is in a conducting state; the output end of the button circuit is in a conducting state when the switch circuit is on The key signal is output in the ON state. In the implementation of the present application, the button does not need to be in contact with the printed circuit board, but the effect of the button being connected to the circuit can be achieved, which is beneficial to the maintenance of the button and the circuit board during use.

Description of drawings

1 is a structural block diagram of a key circuit provided by an embodiment of the present application;

2 is a schematic diagram of a key circuit provided by an embodiment of the present application;

FIG. 3 is an electronic device provided by an embodiment of the present application.

Detailed ways

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present application.

The implementation of the technical solutions of the present application will be further described in detail below with reference to the accompanying drawings.

Referring to FIG. 1 , FIG. 1 is a structural block diagram of a key circuit according to an embodiment of the present application. As shown in FIG. 1 , the button circuit 10 includes a first displacement sensor 100 , a detected object 101 , a button 102 , a voltage comparator 103 and a switch circuit 104 , and the detected object 101 changes with the state of the button 102 . displacement, where:

The first displacement sensor 100 is used to sense whether the detected object 101 is displaced, and convert the displacement of the detected object 101 into a first voltage amount;

The output end of the first displacement sensor 101 is connected to the first input end of the voltage comparator 103, and the voltage comparator 103 is used to determine the output value of the first displacement sensor 100 according to the first voltage output by the first displacement sensor 100. level signal, so that the switch circuit 104 between the power supply and the output end of the button circuit 10 is in a conducting state;

The output end of the button circuit 10 outputs a button signal when the switch circuit 104 is in an on state.

The working principle of the key circuit 10 is as follows:

When the button 102 is pressed, the object to be detected 101 moves along the direction in which the button 102 is pressed, the first displacement sensor 100 senses that the object to be detected 101 is displaced, The displacement of the detected object 101 is converted into a first voltage, and the first voltage is output to the voltage comparator 103, and the voltage comparator 103 determines the voltage output by itself according to the first voltage. level signal, so that the switch circuit 104 is in a conducting state, and the high level output by the output terminal of the button circuit 10 is the button signal, which means that the button 102 is in a pressed state; When the button 102 is released, the switch circuit 104 is in an off state, and the output terminal of the button circuit 10 does not output a high level, ie, does not output the button signal, which means that the button 102 is in a released state.

Further, the button circuit 10 also includes a second displacement sensor;

The output end of the second displacement sensor is connected to the second input end of the voltage comparator 103, the second displacement sensor is used to sense whether the detected object 101 is displaced, and the detected object The displacement amount of 101 is converted into a second voltage amount, wherein the first displacement sensor 100 and the second displacement sensor are on the horizontal line in the pressing direction of the key, and are respectively located on both sides of the detected object 101 . Specifically, the voltage comparator 103 includes two input terminals, and the voltage comparator 103 is a component for discriminating and comparing input signals. When the magnitude of the second voltage output by the two displacement sensors is equal, the output voltage is zero; when the magnitude of the first voltage output by the first displacement sensor 100 is not equal to the magnitude of the second voltage output by the second displacement sensor, the output voltage is zero. A non-zero voltage is output that puts the switch circuit in a conducting state. Exemplarily, when the state of the button 102 is not pressed, the first voltage output by the first displacement sensor 100 and the second voltage output by the second displacement sensor are equal in magnitude.

It can be understood that the second displacement sensor is used to output a second voltage, and the first voltage output by the first displacement sensor and the second voltage output by the second displacement sensor can be regarded as the voltage. The two differential input quantities of the comparator 103, the voltage comparator 103 determines the level signal output by itself according to the difference between the second voltage quantity and the first voltage quantity output by the first displacement sensor. In this embodiment, the second displacement sensor is added, and the differential signal formed between the voltages output by the first displacement sensor and the second displacement sensor is used. In this case, the signal output of the key pressed can be realized, so that the space occupied by the key circuit 10 can be reduced.

In a possible embodiment, the first displacement sensor 100 is a photoelectric displacement sensor, and the detected object 101 is a non-transparent object. Specifically, a photoelectric displacement sensor is a sensor based on the photoelectric effect, which is composed of a light source, a light-emitting path and a light-emitting element. After being irradiated by visible light, a photoelectric effect is generated, and the light signal is converted into an electrical signal for output. When the displacement sensors in the embodiments of the present application, such as the first displacement sensor and the second displacement sensor, are photoelectric displacement sensors, the detected object 101 is a non-transparent object, which is used for the light beam emitted by the light source in the photoelectric displacement sensor For reflection, the light beam can be generated by a semiconductor light source such as a light-emitting diode or an infrared light-emitting diode. The position of the detected object, and further, the displacement of the detected object is obtained by determining the position of the detected object twice adjacently, so as to convert the displacement into a voltage amount to realize the detected object and the displacement sensor. The effect of the displacement of the detected object can be measured without contact between them. In this embodiment, the photoelectric displacement sensor is used to sense whether the detected object is displaced, which has the advantage of fast response. It can be understood that the photoelectric displacement sensor is preset by the manufacturer, and the application can also use photoelectric displacement sensors with other working principles, such as using light transmission, blocking or interference, etc. The reflection of light is used to illustrate how the photoelectric sensor measures the displacement of the object to be detected, and the internal working principle of the photoelectric displacement sensor used in the present application is not limited.

In another possible embodiment, the first displacement sensor 100 is an inductive displacement sensor, and the detected object is a metal conductor. Specifically, the inductive displacement sensor is a metal induction device, which uses the principle of electromagnetic induction to convert the displacement of the detected object into a voltage. It should be noted that the inductive displacement sensor has a certain measurement range. Within the measurement range of the inductive displacement sensor, there is a linear relationship between the displacement of the detected object and the voltage. The inductive displacement sensor includes a coil, and if an alternating current is supplied to the coil, the inductive displacement sensor will generate an alternating magnetic field. When the metal conductor, that is, the detected object 101, is placed in the alternating magnetic field, an induced current will be generated in the metal conductor. According to the principle of electromagnetism, the detected object 101 will also generate a magnetic field to cancel the alternating magnetic field generated by the coil in the inductive displacement sensor. Since the distance between the detected object 101 and the inductive displacement sensor will affect the offsetting of the alternating magnetic field Because of the variation of the inductance of the magnetic field, the displacement of the detected object can be sensed through the coil inductance of the inductive displacement sensor, and the displacement of the detected object 101 can be converted into a voltage. In this embodiment, the inductive displacement sensor is used to convert the displacement of the detected object into a voltage, which has the advantage of high measurement accuracy. Similarly, the inductive type is also preset by the manufacturer. The application can also use inductive displacement sensors with other working principles, such as using the self-inductance, mutual inductance or eddy current of the coil, etc. The detected object produces an eddy current effect in the alternating magnetic field to illustrate how the electromagnetic sensor measures the displacement of the detected object, and does not limit the internal working principle of the electromagnetic displacement sensor used in this application.

In a possible implementation manner, the detected object 101 is mechanically connected to the key 102 through an elastic object. Specifically, the object to be detected 101 is mechanically connected to the button 102. In order to make the button 102 automatically bounce back to the released state after being pressed, the object to be detected 101 can be connected to the button 102. An elastic object such as a spring is placed between the buttons 102. When the button 102 is pressed, the spring will be compressed. When the button 102 is released, the spring will use the elastic force to restore the button to the released state. Location.

In this application, the detected object is displaced as the state of the button changes, and the displacement sensor is used to sense whether the detected object is displaced, and convert the displacement of the detected object into a voltage; the displacement sensor The output terminal of the voltage comparator is connected to the input terminal of the voltage comparator, and the voltage comparator is used to determine the level signal output by itself according to the voltage output by the displacement sensor, so that between the power supply and the output terminal of the key circuit The switch circuit is in a conducting state; the output end of the button circuit outputs a button signal when the switch circuit is in a conducting state. In the implementation of the present application, the button does not need to be in contact with the printed circuit board, but the effect of the button being connected to the circuit can be achieved, which is beneficial to the maintenance of the button and the circuit board during use.

The structural block diagram corresponding to FIG. 1 is introduced below in conjunction with specific components. Referring to FIG. 2 , FIG. 2 is a schematic diagram of a key circuit according to an embodiment of the present application. As shown in FIG. 2 , the button circuit 20 includes displacement sensors such as a first displacement sensor 2000 and a second displacement sensor 2001 , a detected 201 , a button 202 , a voltage comparator 203 and a switch circuit 204 , for example, the switch circuit 204 Can be a field effect transistor Q1, the gate of the field effect transistor Q1 is connected to the output end of the voltage comparator 203, the drain of the field effect transistor Q1 is connected to the power supply, and the source of the field effect transistor Q1 It is connected with the output end of the key circuit 20 . As shown in Figure 2, the connection relationship between the various components is as follows:

The output terminal of the first displacement sensor 2000 is connected to the inverting input terminal of the voltage comparator 203, the output terminal of the second displacement sensor 2001 is connected to the non-inverting input terminal of the voltage comparator 203, and the The output terminal of the voltage comparator 203 is connected to the gate of the FET Q1, the drain of the FET Q1 is connected to the power supply, and the source of the FET Q1 is connected to the output terminal of the button circuit 20 Connection, optionally, the output end of the button circuit 20 can be connected to a processor, the processor can read the level of the output end of the button circuit in real time, the processor can be an integrated circuit, including but not limited to A central processing unit (Center Processor Unit, CPU), an embedded microcontroller (Micro Controller Unit, MCU), an embedded microprocessor (Micro Processor Unit, MPU), and an embedded system on chip (System on Chip, SoC).

The working principle of the key circuit 20 is as follows:

When the button 202 is not pressed, the first voltage output by the first displacement sensor 2000 and the second voltage output by the second displacement sensor 2001 are equal in magnitude, and the positive phase input of the voltage comparator 203 The voltages of the terminal and the inverting input terminal are equal, the voltage comparator 203 has no output, and the output terminal of the button circuit 20 is low level; when the button 202 is pressed, the detected object 201 moves along the button. 202 moves in the pressing direction, the first voltage output by the first displacement sensor 2000 and the second voltage output by the second displacement sensor 2001 are not equal in magnitude. In a possible embodiment, the field effect transistor Q1 is an enhancement type P-channel field effect transistor, and the first voltage output by the first displacement sensor 2000 is greater than the second voltage output by the second displacement sensor 2001 The second voltage output from the displacement sensor 2001, the voltage comparator 203 outputs a negative voltage, the FET Q1 is in a conducting state, and the voltage of the power supply is the voltage of the output terminal of the button circuit 20, that is, the The output terminal of the key circuit 20 is at a high level. In another possible embodiment, the field effect transistor Q1 is an enhancement type N-channel field effect transistor, and the first voltage output by the first displacement sensor 2000 is smaller than the first voltage output by the second displacement sensor 2001 The second voltage output from the displacement sensor 2001, the voltage comparator 203 outputs a positive voltage, the field effect transistor Q1 is in a conducting state, and the voltage of the power supply is the voltage of the output terminal of the button circuit 20, that is, the The output terminal of the key circuit 20 is at a high level.

In the implementation of the present application, the button does not need to be in contact with the printed circuit board, but the effect of the button being connected to the circuit can be achieved, which is beneficial to the maintenance of the button and the circuit board during use.

The embodiment of the present application further provides an electrical device, referring to FIG. 3 , the electrical device 30 includes a key circuit 300, a transceiver 301 and a processor 302, wherein:

The button circuit 300 is connected to the transceiver 301, and the transceiver 301 is connected to the processor 302;

The transceiver 301 is used to receive the key signal output by the output end of the key circuit 300, and the processor 302 is used to execute instructions according to the key signal received by the transceiver 301, such as turning on the electronic device and turning off the electronic device. , increase the volume or decrease the volume, etc., the key circuit 300 is used to sense the state of the key that is not soldered on the printed circuit board through the detected object.

Optionally, the powered device 30 may further include a memory for storing instructions executed by the processor 302 .

The processor 302 may be a central processing unit (CPU), a general-purpose processor, a digital signal processor (DSP), an application-specific integrated circuit (ASIC), or a field programmable Gate array (field programmable gate array, device combination, DSP and microprocessor FPGA) or other programmable logic devices, transistor logic devices, hardware components or any combination thereof. It may implement or execute various exemplary logical blocks, modules and circuits described in connection with the disclosure of the embodiments of this application. A processor may also be a combination that implements computing functions, such as a combination of one or more microprocessors, and the like.

In addition to the button circuit 300 , the transceiver 302 and the processor 302 shown in FIG. 3 , the electrical equipment described in the embodiments of the present application may also include other hardware, usually according to the actual function of the electrical equipment, which is no longer required. Repeat. Optionally, the electrical device can achieve the beneficial effects of the above-mentioned button circuit. For the structure and function of the button circuit 300, reference may be made to the relevant descriptions in the embodiments described in the foregoing FIG. 1 to FIG. 2 , which will not be repeated here. .

It should be noted that the above-mentioned terms "first" and "second" are only used for descriptive purposes, and should not be construed as indicating or implying relative importance.

In the several embodiments provided in this application, it should be understood that the disclosed method, apparatus and system may be implemented in other manners. The above-described embodiments are only illustrative. For example, the division of the units is only a logical function division. In actual implementation, there may be other division methods. For example, multiple units or components may be combined, or Integration into another system, or some features can be ignored, or not implemented. In addition, the coupling, or direct coupling, or communication connection between the components shown or discussed may be through some interfaces, and the indirect coupling or communication connection of devices or units may be electrical, mechanical or other forms. of.

The unit described above as a separate component may or may not be physically separated, and the component displayed as a unit may or may not be a physical unit, that is, it may be located in one place or distributed to multiple network units; Some or all of the units may be selected according to actual needs to achieve the purpose of the solution in this embodiment.

In addition, each functional unit in each embodiment of the present invention may all be integrated into one processing unit, or each unit may be separately used as a unit, or two or more units may be integrated into one unit; the above-mentioned integration The unit can be implemented either in the form of hardware or in the form of hardware plus software functional units.

Those of ordinary skill in the art can understand that all or part of the steps of implementing the above method embodiments can be completed by program instructions related to hardware, the aforementioned program can be stored in a computer-readable storage medium, and when the program is executed, execute Including the steps of the above-mentioned method embodiment; and the aforementioned storage medium includes: a mobile storage device, a read-only memory (ROM, Read-Only Memory), a random access memory (RAM, Random Access Memory), a magnetic disk or an optical disk and other various A medium on which program code can be stored.

Alternatively, if the above-mentioned integrated unit of the present invention is implemented in the form of a software function module and sold or used as an independent product, it may also be stored in a computer-readable storage medium. Based on this understanding, the technical solutions of the embodiments of the present invention may be embodied in the form of software products in essence or the parts that make contributions to the prior art. The computer software products are stored in a storage medium and include several instructions for A computer device (which may be a personal computer, a server, or a network device, etc.) is caused to execute all or part of the methods described in the various embodiments of the present invention. The aforementioned storage medium includes: a removable storage device, a ROM, a RAM, a magnetic disk or an optical disk and other mediums that can store program codes.

The above are only specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed by the present invention. should be included within the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims (9)

1. A button circuit, characterized in that the button circuit comprises a first displacement sensor, a detected object, a button, a voltage comparator and a switch circuit, and the detected object is displaced along with the state change of the button ,in: The first displacement sensor is used to sense whether the detected object is displaced, and convert the displacement of the detected object into a first voltage amount; The output end of the first displacement sensor is connected to the first input end of the voltage comparator, and the voltage comparator is used to determine the level signal output by itself according to the first voltage output by the first displacement sensor, so that The switch circuit between the power supply and the output end of the key circuit is in a conducting state; The output end of the key circuit outputs a key signal when the switch circuit is in a conducting state. 2. The button circuit according to claim 1, wherein the button circuit further comprises a second displacement sensor; The output end of the second displacement sensor is connected to the second input end of the voltage comparator, the second displacement sensor is used to sense whether the detected object is displaced, and the displacement of the detected object The quantity is converted into a second voltage quantity, wherein the first displacement sensor and the second displacement sensor are on the horizontal line of the pressing direction of the key, and are respectively located on both sides of the detected object. 3. The button circuit according to claim 2, wherein the voltage comparator is used for: When the magnitude of the first voltage output by the first displacement sensor is equal to the magnitude of the second voltage output by the second displacement sensor, the output voltage is zero; When the magnitude of the first voltage output by the first displacement sensor is not equal to the magnitude of the second voltage output by the second displacement sensor, a non-zero voltage that keeps the switch circuit in an on state is output. 4 . The key circuit according to claim 1 , wherein the first displacement sensor is a photoelectric displacement sensor, and the detected object is a non-transparent object. 5 . 5 . The key circuit according to claim 1 , wherein the first displacement sensor is an inductive displacement sensor, and the detected object is a metal conductor. 6 . 6 . The key circuit according to claim 2 , wherein when the state of the key is not pressed, the first voltage output by the first displacement sensor and the output by the second displacement sensor The magnitude of the second voltage is equal. 7 . The button circuit according to claim 1 , wherein the object to be detected is mechanically connected to the button through an elastic object. 8 . 8 . The button circuit according to claim 1 , wherein the switch circuit is a field effect transistor, the gate of the field effect transistor is connected to the output end of the voltage comparator, and the The drain is connected to the power supply, and the source of the field effect transistor is connected to the output end of the key circuit. 9. An electrical device, characterized in that, the electronic device includes the circuit according to any one of claims 1-8.

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