Touch switch circuit and electronic equipment
By designing a tactile switch circuit that incorporates a combination of switching devices and diodes and capacitors, the problem of tactile switches requiring external force to maintain a closed state is solved, achieving a self-locking function and improving the reliability and miniaturization of the device.
Patent Information
- Application Number
- CN202510886431.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-06-30
- Publication Date
- 2025-10-31
AI Technical Summary
Existing tactile switches require external force to maintain the pressed state to keep the switch closed, which limits their application in miniaturized devices, and programmable processor control poses a risk of unreliability.
Design a tactile switch circuit, including a first, second and third switching device. By combining diodes and capacitors, the capacitor stores electrical energy to keep the switch in the on state. Combined with programmable processor trigger instructions, a self-locking function is achieved.
The reliable self-locking function of the tactile switch is realized, ensuring that the switch remains in the conductive state without pressing the button, thus improving the miniaturization and reliability of the device.
Smart Images
Figure CN120880423A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of switching circuit technology, and more particularly to a tactile switch circuit and electronic device. Background Technology
[0002] In miniaturized portable devices, tactile switches are widely used due to their small size and variety of styles. However, existing tactile switches also have shortcomings. Their pressed state requires external force to maintain the switch in a closed state, which limits some application scenarios. As a power-on signal, a self-locking switch needs to be introduced into the product or device to keep the power-on signal in a closed state to ensure that the power is always on. However, self-locking switches are generally large in size, which makes it impossible to achieve miniaturization and portability in the product's structural design.
[0003] Some existing systems use programmable processors to control analog tactile switches to remain closed, thus ensuring that the power supply is always on.
[0004] However, since it is controlled by a program, there are many uncontrollable factors. For example, program bugs or abnormal processor operation may cause the system to fail to boot and the problem may be difficult to troubleshoot.
[0005] Therefore, improving the reliability of tactile switches while ensuring their small size is a pressing technical problem that needs to be solved. Summary of the Invention
[0006] In view of the above problems, the present invention is proposed to provide a tactile switch circuit and electronic device that overcomes or at least partially solves the above problems.
[0007] In a first aspect, the present invention provides a tactile switch circuit, comprising:
[0008] Tap the button;
[0009] The device comprises a first switch, a second switch, and a third switch. One end of the first switch is connected to a tactile button, and the other end is connected to the second switch. One end of the third switch is connected between the first switch and the second switch, and the other end is connected to the VCC terminal.
[0010] The third switching device is further connected to a diode and a capacitor in sequence at one end, and the other end of the capacitor is grounded.
[0011] The connection between the diode and the capacitor is connected to the other end of the second switching device;
[0012] When the touch button is pressed, the first switching device is turned on, the third switching device is turned on, and the capacitor is charged through the diode.
[0013] After the tactile button is released, the first switching device is turned off. Since the capacitor stores electricity, the second switching device is turned on. The connection point between the first and second switching devices is at a low level, which turns the third switching device on again. The third switching device remains in the on state for a long time, realizing the tactile switch's touch-to-open function.
[0014] Preferably, the first and second switching devices are both N-type MOSFETs, and the third switching device is a P-type MOSFET.
[0015] Preferably, the first gate of the first switching device is connected to a tactile button, the first drain of the first switching device is connected to the second drain of the second switching device, and the first source of the first switching device is grounded.
[0016] The second gate of the second switching device is connected to the junction of the diode and the capacitor, and the second source of the second switching device is grounded.
[0017] The third gate of the third switching device is connected to the connection between the first and second switching devices, and the third drain of the third switching device is connected to the VCC terminal.
[0018] Preferably, after the tactile switch is activated, the touch operation of the tactile button will not affect the conduction and cutoff of the first switch device, the second switch device, and the third switch device.
[0019] Preferably, a programmable processor is connected to one end of the first switching device and the tactile button via a resistor;
[0020] The programmable processor is used to trigger and execute corresponding instructions based on the touch operation settings of the tactile button.
[0021] Preferably, the third drain of the third switching device is connected to the positive terminal of the diode, the negative terminal of the diode is connected to one end of the capacitor, and the other end of the capacitor is grounded.
[0022] Preferably, the third source of the third switching device is connected to the battery module, and when the third switching device is turned on, it supplies power to the load through the VCC terminal.
[0023] In a second aspect, the present invention also provides an electronic device including the tactile switch circuit described in the first aspect.
[0024] One or more technical solutions in the embodiments of the present invention have at least the following technical effects or advantages:
[0025] This invention provides a tactile switch circuit, comprising: a tactile button; a first switch device, a second switch device, and a third switch device, wherein one end of the first switch device is connected to the tactile switch and the other end is connected to the second switch device, one end of the third switch device is connected between the first and second switch devices, and the other end is connected to the VCC terminal; a diode and a capacitor, wherein the other end of the third switch device is sequentially connected to the diode and the capacitor, and the other end of the capacitor is grounded; the connection point of the diode and the capacitor is connected to the other end of the second switch device; when the tactile button is pressed, the first switch device is turned on, the third switch device is turned on, and the capacitor is charged through the diode; after the tactile button is released, the first switch device is turned off, the capacitor stores a charge, causing the second switch device to turn on, and the connection point of the first and second switch devices is at a low level, causing the third switch device to turn on again. The third switch device remains in the on state for a long time, realizing the tactile switch's tactile-on function. At this time, the tactile button does not need to be pressed to achieve the on state of the third switch device, ensuring the reliability of the tactile switch circuit. Attached Figure Description
[0026] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the invention. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:
[0027] Figure 1 A schematic diagram of a tactile switch circuit according to an embodiment of the present invention is shown. Detailed Implementation
[0028] Exemplary embodiments of the present disclosure will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.
[0029] It should be noted that similar reference numerals and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. Furthermore, in the description of this invention, terms such as "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.
[0030] This invention provides a tactile switch circuit, such as... Figure 1 As shown, it includes:
[0031] Touch button SW1;
[0032] The first switch device Q1, the second switch device Q2, and the third switch device Q3 are connected. One end of the first switch device Q1 is connected to the tactile button SW1, and the other end is connected to the second switch device Q2. One end of the third switch device Q3 is connected between the first switch device Q1 and the second switch device Q2, and the other end is connected to the VCC terminal.
[0033] Diode D1 and capacitor CT1 are connected to the other end of the third switching device, and the other end of capacitor CT1 is grounded.
[0034] When the touch button SW1 is pressed, the first switching device Q1 is turned on and the third switching device Q3 is turned on. At this time, the capacitor CT1 is charged through the diode D1.
[0035] After the tactile button SW1 is released, the first switch Q1 is turned off. Since the capacitor CT1 stores electricity, the second switch Q2 is turned on. The connection point between the first switch Q1 and the second switch Q2 is at a low level, which turns the third switch Q3 on again. The third switch Q3 remains in the on state for a long time, realizing the tactile switch's tactile opening function.
[0036] This tactile switch circuit can be used in various small devices. The device can be turned on by lightly pressing the tactile button SW1.
[0037] In a specific implementation, the first switching device Q1 and the second switching device Q2 are both N-type MOS transistors, and the third switching device Q3 is a P-type MOS transistor.
[0038] The connection relationships of each switching device are explained in detail below:
[0039] The first switching device Q1 includes a first source S1, a first gate G1, and a first drain D1; the second switching device Q2 includes a second source S2, a second gate G2, and a second drain D2; and the third switching device Q3 includes a third source S3, a third gate G3, and a third drain D3.
[0040] The first gate G1 of the first switching device Q1 is connected to the tactile button SW1, the first drain D1 of the first switching device Q1 is connected to the second drain D2 of the second switching device Q2, and the first source S1 of the first switching device is grounded.
[0041] Specifically, a first pull-down resistor R10 is connected between the first gate G1 of the first switching device Q1 and the tactile button SW1 and the ground terminal to ensure that the first gate G1 of the first switching device Q1 and the tactile button SW1 remain at a low level when the tactile button SW1 is not pressed.
[0042] The second gate G2 of the second switching device Q2 is connected to the connection point of diode D1 and capacitor CT1, and the second source S2 of the second switching device Q2 is grounded.
[0043] Similarly, a second pull-down resistor R9 is connected between the second gate G2 of the second switching device Q2 and the connection between the diode D1 and the capacitor CT1 and the ground terminal to ensure that the second gate G2 of the second switching device Q2 remains at a low level when the capacitor does not store any charge.
[0044] The third gate G3 of the third switching device Q3 is connected to the connection between the first switching device Q1 and the second switching device Q2, and the third drain D3 of the third switching device Q3 is connected to the VCC terminal.
[0045] Specifically, a pull-up resistor R2 is connected between the third source S3 and the third gate G3 of the third switching device Q3 to ensure that the third source S3 remains at a high level when no power is supplied.
[0046] In one alternative implementation, after the tactile switch circuit achieves the tactile activation function, touch operation on the tactile button SW1 will not affect the conduction and cutoff of the first switching device Q1, the second switching device Q2, and the third switching device Q3. Therefore, the tactile activation function will not be affected.
[0047] Specifically, performing any operation on the touch button SW1 at this time will not affect the subsequent circuitry.
[0048] In one alternative implementation, a programmable processor is connected to one end of the first switching device Q1 and the tactile button SW1 via a resistor R5, which is a general-purpose resistor.
[0049] This programmable processor is used to trigger the execution of corresponding instructions based on the touch operation settings of the tactile button SW1. For example, a long press of button SW1 triggers the execution of corresponding instructions, etc.
[0050] In one optional embodiment, the third drain D3 of the third switching device Q3 is connected to the positive terminal of diode D1, and the negative terminal of diode D2 is connected to one end of capacitor CT1, with the other end of capacitor CT1 grounded. By using diode D2, when the third switching device Q3 is turned on, the unidirectional conduction function of diode D2 prevents the charge in capacitor CT1 from flowing to the third drain D3, thereby turning on the second switching device Q2. This results in a low-level connection between the first drain D1 of the first switching device Q1 and the second drain D2 of the second switching device Q2, ensuring that the third switching device Q3 remains on and in a continuously conducting state.
[0051] When the third switching device Q3 is turned on, its third source S3 is connected to the battery module J1, thereby supplying power to the load through the VCC terminal. This is the power-on state.
[0052] One or more technical solutions in the embodiments of the present invention have at least the following technical effects or advantages:
[0053] This invention provides a tactile switch circuit, comprising: a tactile button; a first switch device, a second switch device, and a third switch device, wherein one end of the first switch device is connected to the tactile switch and the other end is connected to the second switch device, one end of the third switch device is connected between the first and second switch devices, and the other end is connected to the VCC terminal; a diode and a capacitor, wherein the other end of the third switch device is sequentially connected to the diode and the capacitor, and the other end of the capacitor is grounded; the connection point of the diode and the capacitor is connected to the other end of the second switch device; when the tactile button is pressed, the first switch device is turned on, the third switch device is turned on, and the capacitor is charged through the diode; after the tactile button is released, the first switch device is turned off, the capacitor stores a charge, causing the second switch device to turn on, and the connection point of the first and second switch devices is at a low level, causing the third switch device to turn on again. The third switch device remains in the on state for a long time, realizing the tactile switch's tactile-on function. At this time, the tactile button does not need to be pressed to achieve the on state of the third switch device, ensuring the reliability of the tactile switch circuit.
[0054] Example 2
[0055] Based on the same inventive concept, the present invention also provides an electronic device, including: any of the tactile switch circuits in Embodiment 1.
[0056] This electronic device can be reliably powered on using this touch switch circuit, while also being small in size and not taking up too much space in the electronic device.
[0057] Although preferred embodiments of the invention have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including both the preferred embodiments and all changes and modifications falling within the scope of the invention.
[0058] Obviously, those skilled in the art can make various modifications and variations to this invention without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this invention and their equivalents, this invention also intends to include these modifications and variations.
Claims
1. A tactile switch circuit, characterized in that, include: Tap the button; The device comprises a first switch, a second switch, and a third switch. One end of the first switch is connected to a tactile button, and the other end is connected to the second switch. One end of the third switch is connected between the first switch and the second switch, and the other end is connected to the VCC terminal. The third switching device is further connected to a diode and a capacitor in sequence at one end, and the other end of the capacitor is grounded. The connection between the diode and the capacitor is connected to the other end of the second switching device; When the touch button is pressed, the first switching device is turned on, the third switching device is turned on, and the capacitor is charged through the diode. After the tactile button is released, the first switching device is turned off, the capacitor stores electricity, which turns on the second switching device. The connection point between the first and second switching devices is at a low level, and the third switching device turns on again. The third switching device remains in the on state for a long time, realizing the tactile switch circuit's tactile activation function.
2. The tactile switch circuit as described in claim 1, characterized in that, The first and second switching devices are both N-type MOSFETs, and the third switching device is a P-type MOSFET.
3. The tactile switch circuit as described in claim 1, characterized in that, The first gate of the first switching device is connected to a touch button, the first drain of the first switching device is connected to the second drain of the second switching device, and the first source of the first switching device is grounded. The second gate of the second switching device is connected to the junction of the diode and the capacitor, and the second source of the second switching device is grounded. The third gate of the third switching device is connected to the connection between the first and second switching devices, and the third drain of the third switching device is connected to the VCC terminal.
4. The tactile switch circuit as described in claim 1, characterized in that, After the tactile switch is activated, the touch operation of the tactile button will not affect the conduction and cutoff of the first switch device, the second switch device, and the third switch device.
5. The tactile switch circuit as described in claim 4, characterized in that, A programmable processor is connected to one end of the first switching device and the tactile button via a resistor; The programmable processor is used to trigger and execute corresponding instructions based on the touch operation settings of the tactile button.
6. The tactile switch circuit as described in claim 1, characterized in that, The third drain of the third switching device is connected to the positive terminal of the diode, the negative terminal of the diode is connected to one end of the capacitor, and the other end of the capacitor is grounded.
7. The tactile switch circuit as described in claim 1, characterized in that, The third source of the third switching device is connected to the battery module, and when the third switching device is turned on, it supplies power to the load through the VCC terminal.
8. An electronic device, characterized in that, include: The tactile switch circuit as described in any one of claims 1 to 7.