Human body impedance detection circuit for massage equipment

Abstract

A human body impedance detection circuit for massage equipment is provided with a control unit, an impedance detection unit, a contact detection unit and a prompt unit, a first end of the control unit is electrically connected with the impedance detection unit, a second end of the control unit is electrically connected with the contact detection unit, and a third end of the control unit is electrically connected with the prompt unit. The TENS electrical stimulation massage unit is used for detecting the impedance of the skin of the user so as to judge the dryness degree of the skin of the user, then the skin state information of the user is presented to the user through the prompting unit, and the user can adjust the time of TENS electrical stimulation massage according to the skin state information and can improve the skin of the user according to the skin state information; and the method can also be used for detecting whether the user correctly wears the TENS electrode of the massage equipment, so that the safety of the massage equipment is improved, and the energy consumption of the massage equipment is reduced.

Description

Technical Field

[0001] The utility model belongs to the field of detection circuits for massage equipment, and in particular relates to a human body impedance detection circuit for massage equipment. Background Art

[0002] Transcutaneous Electrical Nerve Stimulation (TENS) is a non-drug treatment method that stimulates nerve fibers by placing electrodes on the patient's skin surface and sending electrical signals of specific frequency and current. It is widely used in massage equipment.

[0003] However, the moisture level of human skin is different, and the impedance between TENS electrodes is also different. It is difficult for users to adjust the intensity and time of TENS electrical stimulation massage according to their own skin condition, which can easily cause users to feel strongly stimulated and uncomfortable during use, affecting the user experience. Utility Model Content

[0004] The purpose of the utility model is to provide a control circuit for heating massage equipment to solve the technical problems existing in the prior art.

[0005] A human body impedance detection circuit for massage equipment comprises a control unit, an impedance detection unit, a contact detection unit, and a prompt unit, wherein: a first end of the control unit is electrically connected to the impedance detection unit, a second end of the control unit is electrically connected to the contact detection unit, and a third end of the control unit is electrically connected to the prompt unit.

[0006] Preferably, the control unit includes a control chip U1; the impedance detection unit includes: a first transistor Q1, a second transistor Q2, a third transistor Q3, a first resistor R1, and a second resistor R2; the base of the first transistor Q1 is connected to the RES_AD_EN pin of the control chip U1, the emitter of the first transistor Q1 is grounded, and the collector of the first transistor Q1 is connected to the base of the second transistor Q2 and the base of the third transistor Q3; the emitter of the second transistor Q2 is connected to the starting voltage Vq, and the collector of the second transistor Q2 is connected to the connection end of the first electrode sheet TENS+; the emitter of the third transistor Q3 is connected to the connection end of the second electrode sheet EMS-, and the collector of the third transistor Q3 is connected to the first end of the first resistor R1; the first end of the second resistor R2 is connected to the second end of the first resistor R1 and the RES_AD pin of the control chip U1, and the second end of the second resistor R2 is grounded.

[0007] Preferably, the control unit includes a control chip U1; the contact detection unit includes: a bidirectional optocoupler U2; the first end of the bidirectional optocoupler U2 is connected to the connection end of the second electrode sheet EMS-, the second end of the bidirectional optocoupler U2 is connected to the output end of the TENS discharge negative signal TENS-, the third end of the bidirectional optocoupler U2 is grounded, and the fourth end of the bidirectional optocoupler U2 is connected to the TENS contact pin TOUCH_H pin of the control chip U1.

[0008] Preferably, the prompt unit further includes: a display screen control circuit and / or a prompt light control circuit and / or a vibration motor control circuit.

[0009] Preferably, the display screen control circuit includes: a display screen LCD_TFT, a fourth transistor Q4; the display screen LCD_TFT transmits data with the control chip U1 via the SPI bus, LCD_DC is the data / command pin, LCD_CS is the SPI chip select pin, LCD_SCL is the SPI clock line, and LCD_SDA is the SPI data transmission line; the base of the fourth transistor Q4 is connected to the screen bright control pin LCD_BL pin of the control chip U1, the collector of the fourth transistor Q4 is connected to the backlight panel ground terminal LEDK pin of the display screen LCD_TFT, and the emitter of the fourth transistor Q4 is grounded.

[0010] Preferably, the warning light control circuit includes: a first light-emitting diode D1, a second light-emitting diode D2, and a third light-emitting diode D3; the first diode control pin RR pin of the control chip U1 is connected to the first end of the first light-emitting diode D1, the second diode control pin GG pin of the control chip U1 is connected to the first end of the second light-emitting diode D2, and the third diode control pin BB pin of the control chip U1 is connected to the first end of the third light-emitting diode D3; the second ends of the first light-emitting diode D1, the second light-emitting diode D2, and the third light-emitting diode D3 are all grounded.

[0011] Preferably, the vibration motor control circuit includes: a fifth transistor Q5 and a vibration motor; the motor control pin M_EN of the control chip U1 is connected to the base of the fifth transistor Q5, the emitter of the fifth transistor Q5 is grounded, and the collector of the fifth transistor Q5 is connected to the negative pole of the vibration motor; the positive pole of the vibration motor is connected to the motor operating voltage B+.

[0012] Preferably, the voice prompt circuit includes: a voice chip U3; the control chip U1 and the voice chip U3 are connected through the voice data pin DATA and the voice signal busy pin BUSY; the fifth pin of the voice chip U3 is grounded through the fourth capacitor C4, and the seventh pin of the voice chip U3 is connected to the base of the sixth transistor Q6 through the twenty-fourth resistor R24; the emitter of the sixth transistor Q6 is grounded, and the collector of the sixth transistor Q6 is connected to the working / data pin of the speaker SPK; the working positive pin of the speaker SPK is connected to the speaker working voltage.

[0013] Preferably, the voice prompt circuit includes: a voice chip U3; the control chip U1 and the voice chip U3 are connected through the chip clock pin CLK, the voice data pin DATA, and the voice signal busy pin BUSY; the fifth pin of the voice chip U3 is grounded through the fifth capacitor C5, and the seventh pin of the voice chip U3 is connected to the base of the seventh transistor Q7 through the twenty-fifth resistor R25; the emitter of the seventh transistor Q7 is grounded, and the collector of the seventh transistor Q7 is connected to the working / data pin of the speaker SPK; the working positive pin of the speaker SPK is connected to the speaker working voltage.

[0014] Preferably, the voice prompt circuit includes: a voice chip U3; the control chip U1 and the voice chip U3 are connected through the voice data pin DATA and the voice signal busy pin BUSY, or the control chip U1 and the voice chip U3 are connected through the chip clock pin CLK, the voice data pin DATA, and the voice signal busy pin BUSY; the seventh pin of the voice chip U3 is connected to the working / data pin of the speaker SPK, and the fifth pin of the voice chip U3 is conductively connected to the speaker SPK.

[0015] The present application relates to a human body impedance detection circuit for a massage device, which has the following advantages and positive effects: a control unit is communicatively connected to an impedance detection unit for detecting the impedance of a user's skin, thereby determining the dryness of the user's skin, and then presenting the user's skin status information to the user through a prompt unit. The user can adjust the intensity and / or time of TENS electrical stimulation massage according to the skin status information, and can improve the surface wetness of his or her own skin; a control unit is communicatively connected to a contact detection unit for detecting whether the user is correctly wearing the TENS electrodes of the massage device. When the contact detection unit detects that the user is not correctly wearing the TENS electrodes of the massage device, or that the TENS electrodes of the massage device are detached from the surface of the user's skin, the control unit turns off the TENS electrical stimulation function of the massage device, and the control unit sends a shutdown instruction to the impedance detection unit, and the impedance detection unit stops working, thereby improving the safety of the massage device and reducing the energy consumption of the massage device. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The utility model has the following drawings:

[0017] Figure 1 This is a schematic diagram of an embodiment of a human body impedance detection circuit for massage equipment.

[0018] Figure 2 This is the control chip pin of an embodiment of a human body impedance detection circuit for massage equipment.

[0019] Figure 3 This is a circuit diagram of an impedance detection unit in an embodiment of a human body impedance detection circuit for massage equipment.

[0020] Figure 4 This is a circuit diagram of a contact detection unit of an embodiment of a human body impedance detection circuit for a massage device.

[0021] Figure 5 This is a display screen control circuit diagram of an embodiment of a human body impedance detection circuit for massage equipment.

[0022] Figure 6 This is a circuit diagram of a warning light control circuit according to an embodiment of a human body impedance detection circuit for massage equipment.

[0023] Figure 7 This is a vibration motor control circuit diagram of an embodiment of a human body impedance detection circuit for massage equipment.

[0024] Figure 8 This is a circuit diagram of a human body impedance detection circuit for massage equipment, a voice prompt circuit, and a one-line serial port application circuit.

[0025] Figure 9 This is a two-wire serial port application circuit diagram for a human body impedance detection circuit embodiment of a massage device.

[0026] Figure 10 This is a simplified application circuit diagram of a voice prompt circuit for a human body impedance detection circuit used in massage equipment. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0028] The terms "first" and "second" in the present invention are used for descriptive purposes only and are not to be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise clearly and specifically defined. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units that are not listed, or may optionally include other steps or units that are inherent to these processes, methods, products or devices.

[0029] The following describes some embodiments of the present application in detail with reference to the accompanying drawings. In the absence of conflict, the following embodiments and features therein may be combined with each other.

[0030] As the instruction manual Figure 1-10 As shown:

[0031] A human body impedance detection circuit for a massage device, characterized by comprising a control unit, an impedance detection unit, a contact detection unit, and a prompt unit, wherein:

[0032] A first end of the control unit is electrically connected to the impedance detection unit, a second end of the control unit is electrically connected to the contact detection unit, and a third end of the control unit is electrically connected to the prompt unit;

[0033] The control unit is used to exchange data with the impedance detection unit and the contact detection unit; the control unit sends a working instruction to the impedance detection unit, and the impedance detection unit starts working to detect the user's skin impedance according to the received working instruction of the impedance detection unit, and feeds back the detected data to the control unit; the contact detection unit feeds back the detected TENS electrode contact / disconnection information to the control unit; the control unit sends control instructions to the prompt unit, including but not limited to: massage equipment normal operation display instructions, user skin status instructions, TENS contact / disconnection instructions for user skin.

[0034] The impedance value of human skin increases as the dryness of the skin increases, and when the skin is moist, the impedance value decreases. When the impedance value is low, the human skin can better adapt to the electric stimulation massage of the massage device, the intensity of the electric stimulation current that the user can withstand is also stronger, and the user will not feel uncomfortable under the strong electric stimulation current. In this embodiment, the control unit and the impedance detection unit are communicatively connected to detect the impedance of the user's skin, thereby determining the dryness of the user's skin. When the impedance value of the user's skin is detected to be greater than 2000Ω, the user's skin state is determined to be "dry". When the impedance value of the user's skin is detected to be between 1000 and 2000Ω, the user's skin state is determined to be "moderate". When the impedance value of the user's skin is detected to be less than 1000Ω, the user's skin state is determined to be "moist". Subsequently, the control unit presents the user's skin condition information to the user through the prompt unit. The user can adjust the time, intensity and mode of TENS electrical stimulation massage according to the skin condition information, and can improve his or her own skin according to the skin condition information; when the skin is in a "dry" state, the user can choose an appropriate wetting agent (water, oil, moisturizing emulsion, etc.) to adjust the humidity of the skin on the surface of the human body, so that the measured impedance value is reduced. At this time, the user's skin condition changes from a "dry" state to a "moderate" or "moist" state. Massage in this state can enable the user to get a better massage experience.

[0035] The control unit is communicatively connected to the contact detection unit to detect whether the user is wearing the TENS electrodes of the massage device correctly. When the contact detection unit detects that the user is not wearing the TENS electrodes of the massage device correctly, or the TENS electrodes of the massage device are detached from the surface of the user's skin, the control unit turns off the TENS electrical stimulation function of the massage device, and the control unit sends a shutdown instruction to the impedance detection unit, and the impedance detection unit stops working, thereby improving the safety of the massage device and reducing the energy consumption of the massage device; the prompt unit can also display or prompt the user of the working voltage, massage frequency, TENS pulse width, and electrical stimulation type of the TENS electrical stimulation function of the massage device.

[0036] In one embodiment, the human body impedance detection circuit for a massage device further includes: a control unit including a control chip U1; an impedance detection unit including: a first transistor Q1, a second transistor Q2, a third transistor Q3, a first resistor R1, and a second resistor R2;

[0037] The base of the first transistor Q1 is connected to the RES_AD_EN pin of the control chip U1, the emitter of the first transistor Q1 is grounded, and the collector of the first transistor Q1 is connected to the base of the second transistor Q2 and the base of the third transistor Q3; the emitter of the second transistor Q2 is connected to the starting voltage Vq, and the starting voltage Vq value can be 0.5V~6V, and the collector of the second transistor Q2 is connected to the connection end of the first electrode sheet TENS+; the emitter of the third transistor Q3 is connected to the connection end of the second electrode sheet EMS-, and the collector of the third transistor Q3 is connected to the first end of the first resistor R1; the first end of the second resistor R2 is connected to the second end of the first resistor R1 and the RES_AD pin of the control chip U1, and the second end of the second resistor R2 is grounded.

[0038] The working principle of this embodiment is as follows: the RES_AD_EN pin of the control chip U1 sends a high level, the impedance detection unit starts working, the first transistor Q1 is turned on, and the base of the second transistor Q2 is grounded. At this time, the emitter of the second transistor Q2 is connected to the starting voltage Vq, and a voltage difference is formed between the emitter and the base of the second transistor Q2, and the second transistor Q2 is turned on; the base of the third transistor Q3 is grounded, and the third transistor Q3 is turned on; since the third transistor Q3 is turned on at this time, the impedance between the first electrode sheet and the second electrode sheet is connected in series with the first resistor R1 and the second resistor R2 to form a loop. At this time, the second resistor R2 is a voltage divider resistor, and the RES_AD pin of the control chip U1 feeds back the voltage value of the voltage divider resistor to the control chip U1. The control chip U1 calculates the impedance value of the user's skin between the first electrode sheet TENS+ and the second electrode sheet EMS- based on the voltage value of the voltage divider resistor.

[0039] In this embodiment, the control chip U1 controls the impedance detection unit to work / off. Through the circuit structure of the control chip U1 and the impedance detection unit of the above massage device, the user's skin impedance value can be measured conveniently, quickly and accurately.

[0040] In this embodiment, the M_EN pin of the control chip U1 sends a high level, the fifth transistor Q5 is turned on, the negative pole of the vibration motor is grounded, the power supply circuit of the vibration motor is turned on, and the vibration motor starts the vibration mode. The massage device detects that the user's skin impedance is too large and the skin condition is "dry". The vibration mode can be turned on by the vibration motor to remind the user that he needs to simply moisturize his skin before using the tens function.

[0041] In one embodiment, the contact detection unit includes: a bidirectional optocoupler U2; the first end of the bidirectional optocoupler U2 is connected to the connection end of the second electrode sheet EMS-, the second end of the bidirectional optocoupler U2 is connected to the output end of the TENS discharge negative signal TENS-, the third end of the bidirectional optocoupler U2 is grounded, and the fourth end of the bidirectional optocoupler U2 is connected to the TENS contact pin TOUCH_H pin of the control chip U1.

[0042] In this embodiment, alternating current is generated between the TENS+ and TENS- electrodes, and is fed back to the TOUCH_H pin of the control chip U1 through a bidirectional optocoupler. When the control chip U1 detects high and low pulse signals, it is determined that the user is wearing and using the massage device normally. If the control chip U1 does not detect high and low pulse signals, it is determined that the user is not wearing the massage device / the massage device has fallen off. At this time, the control chip U1 turns off the TENS electrical stimulation function of the massage device, and the control chip U1 sends a shutdown instruction to the impedance detection unit, and the impedance detection unit stops working, thereby improving the safety of the massage device and reducing the energy consumption of the massage device.

[0043] In one embodiment, the prompt unit further includes: a display screen control circuit and / or a prompt light control circuit and / or a vibration motor control circuit and / or a voice prompt circuit.

[0044] In this embodiment, the massage device uses a display control circuit and / or a warning light control circuit and / or a motor control circuit and / or a voice prompt circuit to display the massage device's operating status, the user's skin condition, and whether TENS is in contact with or out of the user's skin. The display control circuit can remind the user or guide the user's operation by displaying information requiring reminders on the display screen. The warning light circuit can remind the user or instruct the user's operation by flashing the light for a certain duration and / or color. The motor control circuit can remind the user or instruct the user's operation by vibration, which can be of different patterns or durations, and is not limited herein.

[0045] In one embodiment, the display screen control circuit includes: a display screen LCD_TFT and a fourth transistor Q4; the display screen LCD_TFT transmits data with the control chip U1 via an SPI bus, LCD_DC is a data / command pin, LCD_CS is a chip select pin of the SPI, LCD_SCL is a clock line of the SPI, and LCD_SDA is a data transmission line of the SPI; the base of the fourth transistor Q4 is connected to the screen bright control pin LCD_BL of the control chip U1, the collector of the fourth transistor Q4 is connected to the backlight panel ground terminal LEDK of the display screen LCD_TFT, and the emitter of the fourth transistor Q4 is grounded.

[0046] In this embodiment, the display screen transmits data with the control chip via the SPI bus, and the display screen receives control instructions from the control chip, thereby displaying the working status of the massage device, the user's skin status, the TENS contact / disconnection with the user's skin and other working statuses. The user can intuitively operate the massage device according to the instructions displayed on the display screen; and the user can more intuitively see the working status of the massage device from the display screen, thereby determining whether it is necessary to adjust the entire TENS electric stimulation massage time, massage intensity, massage mode, or write down the massage mode that the user thinks is most suitable.

[0047] In one embodiment, the warning light control circuit includes: a first light-emitting diode D1, a second light-emitting diode D2, and a third light-emitting diode D3; the first diode control pin RR of the control chip U1 is connected to the first end of the first light-emitting diode D1, the second diode control pin GG of the control chip U1 is connected to the first end of the second light-emitting diode D2, and the third diode control pin BB of the control chip U1 is connected to the first end of the third light-emitting diode D3; the second ends of the first light-emitting diode D1, the second light-emitting diode D2, and the third light-emitting diode D3 are all grounded.

[0048] In this embodiment, the indicator light control circuit receives control instructions from the control chip, thereby displaying the working status of the massage device, the state of TENS contacting / disconnecting with the user's skin, and other working states. When the first light-emitting diode D1 is on, it means that the user is not wearing the massage device / the massage device has fallen off. The user needs to wear the massage device correctly before the first light-emitting diode D1 goes out; when the second light-emitting diode D2 is on, it means that the user's skin impedance is large and the skin state is "dry", and the user needs to simply moisturize the skin before using the tens function; when the third light-emitting diode D3 is on, it means that the user's skin impedance is small and the skin state is "moist", and the user needs to wipe the moisture off the skin before using the tens function.

[0049] In one embodiment, the vibration motor control circuit includes: a fifth transistor Q5 and a vibration motor; the motor control pin M_EN of the control chip U1 is connected to the base of the fifth transistor Q5, the emitter of the fifth transistor Q5 is grounded, and the collector of the fifth transistor Q5 is connected to the negative electrode of the vibration motor; the positive electrode of the vibration motor is connected to the motor operating voltage B+.

[0050] In this embodiment, the user can be reminded to perform operations through different vibration modes of the motor, or during the operation, the user can be reminded of the operation that has been performed through vibration to prevent the user from performing too many operations or repeating operations.

[0051] In one embodiment, the voice prompt circuit includes: a voice chip U3; the control chip U1 and the voice chip U3 are connected through the voice data pin DATA and the voice signal busy pin BUSY; the fifth pin of the voice chip U3 is grounded through the fourth capacitor C4, and the seventh pin of the voice chip U3 is connected to the base of the sixth transistor Q6 through the twenty-fourth resistor R24; the emitter of the sixth transistor Q6 is grounded, and the collector of the sixth transistor Q6 is connected to the working / data pin of the speaker SPK; the working positive pin of the speaker SPK is connected to the speaker working voltage, and the speaker working voltage can be 2V~10V.

[0052] The BUSY pin is a status signal for voice chip U3, indicating whether it is busy processing a task. When the BUSY pin is set high, it indicates that voice chip U3 is busy performing a task, such as data conversion or voice playback, and cannot accept new commands or perform other operations. When the BUSY pin transitions from high to low, it indicates that the task is complete, and voice chip U3 is in an idle state, ready to accept new commands or data. Voice chip U3 uses pin 7 to control the on / off of transistor Q6, thereby controlling the voice played by speaker SPK, volume adjustment, and playback mode.

[0053] In this embodiment, the control chip U1 sends eight-bit control data to the voice chip U3 through the data pin DATA. The voice chip U3 parses the received eight-bit control data and sends a control instruction to the speaker SPK to control the speaker SPK to play the first segment of voice, such as: the first segment of voice - "The skin is too dry, please apply moisturizer", the second segment of voice - "The skin is too moist, please wipe off the moisture", the third segment of voice - "The user is not wearing a massage device", the fourth segment of voice - "The massage device falls off", the fifth segment of voice - "Start massage", the sixth segment of voice - "Massage time is up", etc.; control the speaker SPK speaker SPK to stop and adjust the volume; control the speaker SPK speaker SPK to adopt a loop playback mode.

[0054] In one embodiment, the voice prompt circuit includes: a voice chip U3; the control chip U1 and the voice chip U3 are connected through the chip clock pin CLK, the voice data pin DATA, and the voice signal busy pin BUSY; the fifth pin of the voice chip U3 is grounded through the fifth capacitor C5, and the seventh pin of the voice chip U3 is connected to the base of the seventh transistor Q7 through the twenty-fifth resistor R25; the emitter of the seventh transistor Q7 is grounded, and the collector of the seventh transistor Q7 is connected to the working / data pin of the speaker SPK; the working positive pin of the speaker SPK is connected to the speaker working voltage, and the speaker working voltage can be 2V~10V.

[0055] The BUSY pin is a status signal for voice chip U3, indicating whether it is busy processing a task. When the BUSY pin is set high, it indicates that voice chip U3 is busy performing a task, such as data conversion or voice playback, and cannot accept new commands or perform other operations. When the BUSY pin transitions from high to low, it indicates that the task is complete and voice chip U3 is idle, ready to accept new commands or data. Voice chip U3 uses pin 7 to control the on / off of transistor Q7, thereby controlling the voice played by speaker SPK, volume adjustment, and playback mode.

[0056] In this embodiment, the control chip U1 controls the voice chip U3 through the chip clock pin CLK and the data pin DATA. Every time a byte of data is sent, the clock signal CLK is pulled down for 4ms to 40ms to wake up the voice chip U3, receive the low bit of the data first, and receive the data on the rising edge of the clock; the voice chip U3 parses the received control data and sends a control instruction to the speaker SPK to control the speaker SPK to play the first segment of voice, such as: the first segment of voice - "The skin is too dry, please apply moisturizer", the second segment of voice - "The skin is too wet, please wipe off the moisture", the third segment of voice - "The user is not wearing a massage device", the fourth segment of voice - "The massage device falls off", the fifth segment of voice - "Start massage", the sixth segment of voice - "Massage time is up", etc.; control the speaker SPK speaker SPK to stop and adjust the volume; control the speaker SPK speaker SPK to adopt a loop playback mode.

[0057] In one embodiment, the voice prompt circuit includes: a voice chip U3; the control chip U1 and the voice chip U3 are connected through the voice data pin DATA and the voice signal busy pin BUSY, or the control chip U1 and the voice chip U3 are connected through the chip clock pin CLK, the voice data pin DATA, and the voice signal busy pin BUSY;

[0058] The seventh pin of the voice chip U3 is connected to the working / data pin of the speaker SPK, and the fifth pin of the voice chip U3 is conductively connected to the speaker SPK.

[0059] The BUSY pin is a status signal for voice chip U3, indicating whether it is busy processing a task. When the BUSY pin is set high, it indicates that voice chip U3 is busy performing a task, such as data conversion or voice playback, and cannot accept new commands or perform other operations. When the BUSY pin transitions from high to low, it indicates that the task is complete and voice chip U3 is idle, ready to accept new commands or data. Voice chip U3 uses pin 7 to control the voice played by speaker SPK, volume adjustment, and playback mode.

[0060] In this embodiment, the voice chip U3 is directly connected to the speaker SPK, which simplifies the circuit structure and realizes effective control of the voice played by the speaker SPK, the adjustment of the volume and the playing mode.

[0061] The above description is only a preferred embodiment of the present invention. All equivalent changes and modifications made according to the scope of the patent application of the present invention should fall within the scope of the present invention.

Claims

1. A human body impedance detection circuit for massage equipment, characterized in that: It has a control unit, an impedance detection unit, a contact detection unit, and a prompt unit, wherein: A first end of the control unit is electrically connected to the impedance detection unit, a second end of the control unit is electrically connected to the contact detection unit, and a third end of the control unit is electrically connected to the prompt unit; The control unit includes a control chip U1; the impedance detection unit includes: a first transistor Q1, a second transistor Q2, a third transistor Q3, a first resistor R1, and a second resistor R2; The base of the first transistor Q1 is connected to the RES_AD_EN pin of the control chip U1, the emitter of the first transistor Q1 is grounded, and the collector of the first transistor Q1 is connected to the base of the second transistor Q2 and the base of the third transistor Q3; the emitter of the second transistor Q2 is connected to the starting voltage Vq, and the collector of the second transistor Q2 is connected to the connection end of the first electrode sheet TENS+; the emitter of the third transistor Q3 is connected to the connection end of the second electrode sheet EMS-, and the collector of the third transistor Q3 is connected to the first end of the first resistor R1; the first end of the second resistor R2 is connected to the second end of the first resistor R1 and the RES_AD pin of the control chip U1, and the second end of the second resistor R2 is grounded.

2. The human body impedance detection circuit for massage equipment as claimed in claim 1, characterized in that: The contact detection unit includes: a bidirectional optocoupler U2; the first end of the bidirectional optocoupler U2 is connected to the connection end of the second electrode sheet EMS-, the second end of the bidirectional optocoupler U2 is connected to the output end of the TENS discharge negative signal TENS-, the third end of the bidirectional optocoupler U2 is grounded, and the fourth end of the bidirectional optocoupler U2 is connected to the TENS contact pin TOUCH_H pin of the control chip U1.

3. The human body impedance detection circuit for massage equipment according to claim 2, wherein: The prompt unit further includes: a display screen control circuit and / or a prompt light control circuit and / or a vibration motor control circuit and / or a voice prompt circuit.

4. The human body impedance detection circuit for massage equipment according to claim 3, wherein: The display screen control circuit includes: a display screen LCD_TFT and a fourth transistor Q4; the display screen LCD_TFT transmits data with the control chip U1 via the SPI bus, LCD_DC is the data / command pin, LCD_CS is the SPI chip select pin, LCD_SCL is the SPI clock line, and LCD_SDA is the SPI data transmission line; the base of the fourth transistor Q4 is connected to the screen bright control pin LCD_BL of the control chip U1, the collector of the fourth transistor Q4 is connected to the backlight panel ground terminal LEDK of the display screen LCD_TFT, and the emitter of the fourth transistor Q4 is grounded.

5. The human body impedance detection circuit for massage equipment according to claim 3, wherein: The warning light control circuit includes: a first light-emitting diode D1, a second light-emitting diode D2, and a third light-emitting diode D3; the first diode control pin RR of the control chip U1 is connected to the first end of the first light-emitting diode D1, the second diode control pin GG of the control chip U1 is connected to the first end of the second light-emitting diode D2, and the third diode control pin BB of the control chip U1 is connected to the first end of the third light-emitting diode D3; the second ends of the first light-emitting diode D1, the second light-emitting diode D2, and the third light-emitting diode D3 are all grounded.

6. The human body impedance detection circuit for massage equipment according to claim 3, wherein: The vibration motor control circuit includes: a fifth transistor Q5 and a vibration motor; a motor control pin M_EN of the control chip U1 is connected to the base of the fifth transistor Q5, the emitter of the fifth transistor Q5 is grounded, and the collector of the fifth transistor Q5 is connected to the negative electrode of the vibration motor; and the positive electrode of the vibration motor is connected to the motor operating voltage B+.

7. The human body impedance detection circuit for massage equipment according to claim 3, wherein: The voice prompt circuit includes: a voice chip U3; the control chip U1 and the voice chip U3 are connected through a voice data pin DATA and a voice signal busy pin BUSY; the fifth pin of the voice chip U3 is grounded through a fourth capacitor C4, and the seventh pin of the voice chip U3 is connected to the base of the sixth transistor Q6 through a twenty-fourth resistor R24; the emitter of the sixth transistor Q6 is grounded, and the collector of the sixth transistor Q6 is connected to the working / data pin of the speaker SPK; the working positive pin of the speaker SPK is connected to the speaker working voltage.

8. The human body impedance detection circuit for massage equipment according to claim 3, wherein: The voice prompt circuit includes: a voice chip U3; the control chip U1 and the voice chip U3 are connected through a chip clock pin CLK, a voice data pin DATA, and a voice signal busy pin BUSY; the fifth pin of the voice chip U3 is grounded through a fifth capacitor C5, and the seventh pin of the voice chip U3 is connected to the base of the seventh transistor Q7 through a twenty-fifth resistor R25; the emitter of the seventh transistor Q7 is grounded, and the collector of the seventh transistor Q7 is connected to the working / data pin of the speaker SPK; the working positive pin of the speaker SPK is connected to the speaker working voltage.

9. The human body impedance detection circuit for massage equipment according to claim 3, wherein: The voice prompt circuit includes: a voice chip U3; The control chip U1 is connected to the voice chip U3 via the voice data pin DATA and the voice signal busy pin BUSY, or the control chip U1 is connected to the voice chip U3 via the chip clock pin CLK, the voice data pin DATA and the voice signal busy pin BUSY; The seventh pin of the voice chip U3 is connected to the working / data pin of the speaker SPK, and the fifth pin of the voice chip U3 is conductively connected to the speaker SPK.

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