Touch sensing and heating multiplex circuit and nursing instrument

Abstract

The utility model discloses a touch sensing and heating multiplex circuit and a nursing instrument. The touch sensing and heating multiplex circuit comprises a switch module; a charging and discharging module; the MCU module comprises a multiplexing control end, a transmitting electrode end and a receiving electrode end; the multiplexing control port is connected with the switch module so as to send a high / low level signal to control the on-off state of the switch module; the sending electrode end is connected with the charging and discharging module so as to send high / low level signals; the receiving electrode end is connected with the charging and discharging module to perform potential detection; the induction coil is connected with the switch module and the charging and discharging module, the charging and discharging module charges a formed induction capacitor when the on-off state of the switch module is a first state and the skin is close to the induction coil, and the induction coil serves as a touch induction assembly; the power supply supplies power to the induction coil when the on-off state of the switch module is the second state, and the induction coil serves as a heating assembly. According to the utility model, time division multiplexing of touch sensing and heating functions can be realized.

Description

Technical Field

[0001] The utility model relates to the technical field of nursing instruments, in particular to a touch sensing and heating multiplexing circuit and a nursing instrument. Background Art

[0002] With the advancement and development of society, people are increasingly focusing on quality of life and image management. To maintain their beauty, various smart beauty devices have emerged. With the increasing popularity of these devices, people are no longer satisfied with the functional effects of these products, but are also increasingly concerned with convenience and comfort. Currently, most beauty devices on the market require direct or indirect contact with human skin, are used with corresponding gel lotions, or are applied to beauty products to promote absorption.

[0003] For beauty devices that integrate multiple functions, many products will add skin touch sensing functions to the contact surface for energy saving, safety and intelligence considerations. For instruments that have a heat sensing function and uniform heat sensation, users do not need to worry about adapting to the colder temperature when applying gel to trigger the induction to turn on the heating function. For some instruments that do not have a heating function or have uneven heating sensation, a temperature adaptation process is usually required when used in different environments. If the instrument requires a heating function, it is necessary to add a heating circuit or heating chip, which increases the cost and complexity. In addition, such as CN209187158U and CN219266788U, the existing beauty instruments that have realized touch sensing and heating, the temperature heating circuit and the skin touch sensing circuit (skin touch sensing identifier) are set separately. Utility Model Content

[0004] The main purpose of the utility model is to provide a touch sensing and heating multiplexing circuit and a nursing instrument, which overcome the shortcomings of the existing technology and realize time-sharing multiplexing of touch sensing and heating functions through one circuit.

[0005] The utility model adopts the following technical solutions:

[0006] In one aspect, a touch sensing and heating multiplexing circuit includes:

[0007] Switch module;

[0008] Charge and discharge module;

[0009] The MCU module includes a multiplexing control port, a transmitting electrode port, and a receiving electrode port; the multiplexing control port is connected to the switch module to send a high / low level signal to control the on / off state of the switch module; the transmitting electrode port is connected to the charge and discharge module to send a high / low level signal; and the receiving electrode port is connected to the charge and discharge module to perform potential detection.

[0010] An induction coil is respectively connected to a switch module and a charge and discharge module. When the on-off state of the switch module is in the first state and the skin is close to the induction coil, the charge and discharge module charges the formed induction capacitance, and the induction coil serves as a touch sensing component; when the on-off state of the switch module is in the second state, the power supply supplies power to the induction coil, and the induction coil serves as a heating component.

[0011] Preferably, the first state is an off state and the second state is an on state.

[0012] Preferably, the switch module includes a first switch tube, a second switch tube and a third switch tube; the second end of the first switch tube is connected to the power supply, the third end of the first switch tube is connected to one end of the induction coil, and the first end of the first switch tube is connected to the third end of the third switch tube; the first end of the third switch tube is connected to a multiplexing control end; the first end of the second switch tube is connected to the multiplexing control end, the second end of the second switch is connected to the other end of the induction coil, and the third end of the second switch tube and the second end of the third switch tube are grounded.

[0013] Preferably, the power supply is a DC power supply.

[0014] Preferably, the magnitude of the DC power supply is related to the wire diameter, length and conductive layer thickness of the induction coil.

[0015] Preferably, the induction coil is a copper-clad coil.

[0016] Preferably, the induction coils are evenly distributed.

[0017] Preferably, the charge and discharge module is a capacitor.

[0018] Preferably, the touch sensing and heating multiplexing circuit further includes a first resistor and a second resistor; the transmitting electrode terminal is connected to one end of the charge and discharge module through the serially connected first resistor and second resistor, one end of the charge and discharge module is further connected to the receiving electrode terminal, and the other end of the charge and discharge module is grounded; one end of the induction coil is connected to the connection point of the first resistor and the second resistor.

[0019] On the other hand, a nursing instrument includes a nursing instrument body and the touch sensing and heating multiplexing circuit.

[0020] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0021] (1) The present utility model uses an induction coil to implement a touch sensing function and a heating wire function, and controls the touch sensing and heating time-division multiplexing through an MCU module, so as to realize the sharing of the touch sensing function and the heating function in the same circuit;

[0022] (2) The induction coils of the present utility model are evenly distributed. For nursing instruments that already have a thermal sensing function but have uneven thermal sensing due to the limitations of the heat source on the contact surface, the induction coils can act as heating wires to improve the problem of uneven thermal sensing (for example, the heating head consists of two parts, the middle part is a circular heating metal device, and the periphery of the heating device is a circular circuit board. The circular circuit board itself does not have a heating function. Induction coils are arranged on the circuit board and controlled by the MCU module to heat the induction coils synchronously in time, so as to change the uneven state where only the center of the electrode head has a thermal sense and achieve a relatively uniform temperature across the entire heating head); for nursing instruments that do not have a thermal sensing function themselves, it can endow the contact surface with a thermal sensing effect, enhance the usage effect and improve comfort.

[0023] (3) The present utility model uses induction coils to achieve a touch sensing function, which can not only improve convenience, but also save energy and enhance safety.

[0024] The above description is only an overview of the technical solution of the present utility model. In order to clearly understand the technical means of the present utility model, it can be implemented in accordance with the content of the description. Moreover, in order to make the above and other purposes, features, and advantages of the present utility model more obvious and understandable, the following specific embodiments of the present utility model are listed.

[0025] Based on the following detailed description of the specific embodiments of the present utility model in conjunction with the accompanying drawings, those skilled in the art will be more clearly aware of the above and other purposes, advantages, and features of the present utility model. Description of the Drawings

[0026] Figure 1 It is a schematic diagram of the touch sensing and heating multiplexing circuit according to an embodiment of the present utility model;

[0027] Figure 2 It is a schematic diagram of the structure of the induction coil according to an embodiment of the present utility model. Detailed Embodiments

[0028] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model; obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0029] In the description of the present utility model, it should be noted that the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, such that a process, method, article or device including a series of elements not only includes those elements but also includes other elements not expressly listed, or further includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "including one..." does not exclude the existence of additional identical elements in the process, method, article or device including the said element.

[0030] In the description of the present utility model, it should be noted that the terms "upper", "lower", "inner", "outer", "top / bottom end", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present utility model. In addition, the terms "first" and "second" are only used for descriptive purposes and should not be construed as indicating or implying relative importance.

[0031] In the description of the present utility model, it should be noted that unless otherwise clearly specified and defined, the terms "install", "be provided with", "sheath / connect", "connect", etc. should be understood in a broad sense. For example, "connect" can be a fixed connection, a detachable connection, or an integral connection, can be a mechanical connection, an electrical connection, can be directly connected, or can be indirectly connected through an intermediate medium, and can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0032] A touch sensing and heating multiplexing circuit of the present utility model includes:

[0033] A switch module;

[0034] A charge and discharge module;

[0035] An MCU module, including a multiplexing control terminal, a transmitting electrode terminal and a receiving electrode terminal; the multiplexing control port is connected to the switch module to send high / low level signals to control the on / off state of the switch module; the transmitting electrode terminal is connected to the charge and discharge module to send high / low level signals; the receiving electrode terminal is connected to the charge and discharge module to perform potential detection;

[0036] An induction coil is respectively connected to a switch module and a charge and discharge module. When the on-off state of the switch module is in the first state and the skin is close to the induction coil, the charge and discharge module charges the formed induction capacitance. The induction coil serves as a touch sensing component. When the on-off state of the switch module is in the second state, the power supply supplies power to the induction coil, and the induction coil serves as a heating component.

[0037] In this embodiment, as shown in Figure 1 The MCU module is U1. The first state is the off state, and the second state is the on state. When the multiplexed control terminal I / O PWM2 outputs a low level, it controls the switch module to be in the off state; when the multiplexed control terminal I / O PWM2 outputs a high level, it controls the switch module to be in the on state. When the multiplexed control terminal I / O PWM2 outputs a low level, the transmitting electrode terminal TOUCH PWM1 outputs a high level; when the multiplexed control terminal I / O PWM2 outputs a high level, the transmitting electrode terminal TOUCH PWM1 outputs a low level.

[0038] Specifically, the switch module includes a first switch tube Q1, a second switch tube Q2, and a third switch tube Q3. The second terminal 2 of the first switch tube Q1 is connected to the power supply. The third terminal 3 of the first switch tube Q1 is connected to one end of the induction coil coi1. The first terminal 1 of the first switch tube Q1 is connected to the third terminal 3 of the third switch tube Q3. The first terminal 1 of the third switch tube Q3 is connected to the multiplexed control terminal I / O PWM2. The first terminal 1 of the second switch tube Q2 is connected to the multiplexed control terminal I / O PWM2. The second terminal 2 of the second switch is connected to the other end of the induction coil coi1. The third terminal 3 of the second switch tube Q2 and the second terminal 2 of the third switch tube Q3 are grounded.

[0039] In this embodiment, the first switch tube Q1 and the second switch tube Q2 are MOS tubes, and the third switch tube Q3 is a triode. The first terminal 1 of the first switch tube Q1 is the gate, the second terminal 2 of the first switch tube Q1 is the source, and the third terminal 3 of the first switch tube Q1 is the drain. The first terminal 1 of the second switch tube Q2 is the gate, the second terminal 2 of the second switch tube Q2 is the drain, and the third terminal 3 of the first switch tube Q1 is the source. The first terminal 1 of the third switch tube Q3 is the base, the second terminal 2 of the second switch tube Q2 is the emitter, and the third terminal 3 of the first switch tube Q1 is the collector.

[0040] In this embodiment, the charge and discharge module is capacitor C1. The touch sensing and heating multiplexing circuit further includes a first resistor R1 and a second resistor R2. The transmitting electrode terminal TOUCH PWM1 is connected to one end of the capacitor C1 through the serially connected first resistor R1 and second resistor R2. One end of the capacitor C1 is also connected to the receiving electrode terminal TOUCH, and the other end of the capacitor C1 is grounded. One end of the induction coil coi1 is connected to the connection point of the first resistor R1 and the second resistor R2, and the other end of the induction coil coi1 is connected to the second switching transistor Q2. The second end of the second switching transistor Q2 is connected to the ground.

[0041] The touch sensing and heating multiplexing circuit further includes a second diode D1 connected in parallel with the second resistor R2. The purpose is that whether the induction coil is used as a touch sensing function or a heating function, it is best to release the residual electrical energy of the induction coil first when switching, otherwise it will affect the use after switching. The setting of the diode can accelerate the release of the residual electrical energy.

[0042] In this embodiment, refer to Figure 2 As shown, the induction coil coi1 is formed by running copper wires on the PCB board. According to the area of the PCB board in contact, avoid the placement positions of other devices when routing. According to the available DC power supply VCC, calculate the wire diameter and length of the copper pour routing, or, according to the wire diameter and length of the copper pour routing, calculate the required DC power supply VCC, and arrange them as evenly as possible to achieve a better heating effect.

[0043] In this embodiment, when the induction coil coi1 is used as a touch coil to achieve the touch sensing function, the transmitting electrode terminal TOUCH PWM1 of the MCU module sends a PWM to charge the capacitor C1. When the multiplexing control terminal I / O PWM2 outputs a low level, the second switching transistor Q2 and the third switching transistor Q3 are turned off, and the gate of the first switching transistor Q1 does not meet the conduction condition, so the first switching transistor Q1 is turned off. The transmitting electrode terminal TOUCH PWM1 outputs a high level to charge the capacitor C1. When the skin touches the PCB board where the induction coil coi1 is located, the induction coil coi1 forms an analog capacitor C1 with the human body. At this time, the induction coil coi1 starts to charge, the capacitor C1 discharges, the potential of the capacitor C1 decreases, and the receiving electrode terminal TOUCH recognizes the decrease in the potential of the capacitor C1, triggering the touch sensing function and using the induction coil coi1 as a touch sensing component.

[0044] When the induction coil coi1 functions as a heating wire to achieve the heating function, the multiplexing control terminal I / O PWM2 outputs a high level, the second switching transistor Q2 and the third switching transistor Q3 are turned on, and the gate of the first switching transistor Q1 detects the voltage division of the fourth resistor R4 (low-resistance resistor) and the third resistor R3 (high-resistance resistor), and the first switch is turned on. The DC power supply VCC supplies power to the induction coil coi1, and then passes through the second switching transistor Q2 to the negative terminal of the DC power supply VCC- (in this embodiment, VCC- is the ground terminal). At this time, the induction coil coi1 is equivalent to a low-resistance resistor. The coil resistor will start to heat up but will not be damaged through a certain range of power (voltage and current). At this time, the induction coil coi1 functions as a heating wire, providing temperature to meet the thermal sensation of skin contact or improving the uneven thermal sensation.

[0045] As described above, this embodiment can achieve time-division multiplexing of the touch sensing function and the heating function. Specifically, the MCU module controls the multiplexing control terminal I / O PWM2 to alternately output high and low levels. When the low level is output, the induction coil coi1 serves as a touch sensing component, and when the high level is output, the induction coil coi1 is used as a heating wire function, and so on alternately. For example, within 1 second, in the first 0.3 seconds, the multiplexing control terminal I / O PWM2 outputs a low level, the switching transistors are not turned on, and the induction coil coi1 serves as a touch sensing component. In the next 0.7 seconds, a high level is output, the switching transistors are turned on, and the induction coil coi1 is used as a heating wire. In this way, it is ensured that within a 1-second cycle, the induction coil coi1 serves as both a touch sensing component such as a touch sensor and a heating wire to generate heat, thereby achieving time-division multiplexing of the touch sensing and heating functions.

[0046] Furthermore, according to actual requirements, the multiplexing control terminal alternately outputs high and low levels, and the copper-clad trace quickly switches between the touch function and the heating function, so that time-division multiplexing can be achieved, which is equivalent to having both a touch function and a heating function.

[0047] This embodiment can also adjust the heating power and control the heating temperature. Specifically, the MCU module controls the duty cycle of the high-level output of the multiplexing control terminal, controls the different conduction times of the switching transistors, thereby adjusting the heating power of the induction coil and achieving different heating temperatures. For example, within 1 minute, in the first 50 seconds, every 1 second, the low level occupies 0.3 seconds and the high level occupies 0.7 seconds. The switching transistors are turned off for 0.3 seconds as touch sensing, and the switching transistors are turned on for 0.7 seconds as the heating function. This cycle repeats for 50 seconds, and the induction coil continuously heats for 50 seconds to reach the expected temperature. Starting from the 50th second, every 1 second, the low level occupies 0.7 seconds, the switching transistors are turned off for touch sensing, and the high level occupies 0.3 seconds, and the switching transistors are turned on for heating, shortening the heating time of the induction coil and maintaining the heating temperature within the required temperature range. It can be specifically set according to the application, and this embodiment does not make any restrictions.

[0048] Further, this embodiment also discloses a nursing instrument, such as a beauty instrument. In addition to the existing structure of the nursing instrument, the touch sensing and heating multiplexing circuit of this embodiment is also provided to achieve touch sensing and heating multiplexing.

[0049] The above are only the preferred specific embodiments of the present utility model; however, the protection scope of the present utility model is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present utility model, according to the technical solution and its improved concept of the present utility model, making equivalent substitutions or changes, should be covered by the protection scope of the present utility model.

Claims

1. A touch sensing and heating multiplexing circuit, characterized in that, Comprising: A switch module; A charge and discharge module; An MCU module, including a multiplexing control terminal, a transmitting electrode terminal, and a receiving electrode terminal; the multiplexing control port is connected to the switch module to send high / low level signals to control the on / off state of the switch module; the transmitting electrode terminal is connected to the charge and discharge module to send high / low level signals; the receiving electrode terminal is connected to the charge and discharge module to perform potential detection; An induction coil, which is respectively connected to the switch module and the charge and discharge module. The charge and discharge module charges the formed induction capacitance when the on / off state of the switch module is in the first state and the skin is close to the induction coil. The induction coil serves as a touch sensing component; the power supply supplies power to the induction coil when the on / off state of the switch module is in the second state, and the induction coil serves as a heating component.

2. The touch sensing and heating multiplexing circuit according to claim 1, wherein The first state is the off state, and the second state is the on state.

3. The touch sensing and heating multiplexing circuit according to claim 2, wherein The switch module includes a first switch tube, a second switch tube, and a third switch tube; the second end of the first switch tube is connected to the power supply, the third end of the first switch tube is connected to one end of the induction coil, and the first end of the first switch tube is connected to the third end of the third switch tube; the first end of the third switch tube is connected to the multiplexing control terminal; the first end of the second switch tube is connected to the multiplexing control terminal, the second end of the second switch is connected to the other end of the induction coil, and the third end of the second switch tube and the second end of the third switch tube are grounded.

4. The touch sensing and heating multiplexing circuit according to claim 1, wherein The power supply is a DC power supply.

5. The touch sensing and heating multiplexing circuit according to claim 4, wherein The magnitude of the DC power supply is related to the wire diameter, length, and conductive layer thickness of the induction coil.

6. The touch sensing and heating multiplexing circuit according to claim 1, wherein The induction coil is a copper-plated coil.

7. The touch sensing and heating multiplexing circuit according to claim 1, wherein The induction coils are evenly distributed.

8. The touch sensing and heating multiplexing circuit according to claim 1, wherein The charge and discharge module is a capacitor.

9. The touch sensing and heating multiplexing circuit according to claim 1, wherein It further includes a first resistor and a second resistor; the transmitting electrode terminal is connected to one end of the charge and discharge module through the serially connected first resistor and second resistor, one end of the charge and discharge module is also connected to the receiving electrode terminal, the other end of the charge and discharge module is grounded; one end of the induction coil is connected to the connection point of the first resistor and the second resistor.

10. A nursing instrument, characterized in that, It includes a nursing instrument body and the touch sensing and heating multiplexing circuit according to any one of claims 1 to 9.

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