Micro-current output circuit and wearable electronic device

Abstract

The application relates to the technical field of electronic equipment, and discloses a micro-current output circuit and a wearable electronic device, the micro-current output circuit comprising a voltage boosting unit, a first voltage follower, a first triode, a first resistor, a current flow direction switching unit, a first electrode sheet and a second electrode sheet; the positive-phase input end, the inverting input end and the output end of the first voltage follower are connected with the voltage output end of the voltage boosting unit, the emitter and the base of the first triode respectively; the collector of the first triode is connected with a power supply, and the emitter is grounded through the first resistor; the current flow direction switching unit is connected with the power supply, and the first electrode sheet and the second electrode sheet are connected with the current flow direction switching unit respectively; when the current flow direction switching unit is in a first state, the current flows from the first electrode sheet to the second electrode sheet; and when the current flow direction switching unit is in a second state, the current flows from the second electrode sheet to the first electrode sheet. The application outputs micro-current to a user to help the user enter a sleep state.

Description

Technical Field

[0001] This application relates to the field of electronic device technology, specifically to a microcurrent output circuit and a wearable electronic device. Background Technology

[0002] Difficulty falling asleep is a problem faced by many people. Long-term and severe insomnia can not only seriously affect people's daily lives, but may also lead to a variety of health problems such as mental disorders and high blood pressure, causing certain damage to people's physical and mental health.

[0003] Smart wearable electronic devices are becoming increasingly widespread in daily life. As their intelligence level improves and people pay more attention to their health, more and more people are choosing to wear them while sleeping to monitor their sleep. However, the existing functional circuits adapted to smart wearable electronic devices are limited in variety, and there are currently no circuits that can provide sleep aid functions for them. Utility Model Content

[0004] In view of the above problems, this application provides a microcurrent output circuit and a wearable electronic device to solve the problem that there is no circuit in the prior art that can provide sleep aid function for smart wearable electronic devices.

[0005] According to one aspect of this application, a micro-current output circuit is provided for use in a wearable electronic device. The method includes: a boost unit, a first voltage follower, a first transistor, a first resistor, a current flow switching unit, a first electrode plate, and a second electrode plate. The boost unit includes a voltage input terminal and a voltage output terminal. The voltage input terminal is used to receive voltage, and the voltage output terminal is connected to the non-inverting input terminal of the first voltage follower. The boost unit is used to boost the received voltage and output it to the non-inverting input terminal of the first voltage follower. The inverting input terminal of the first voltage follower is connected to the emitter of the first transistor, and the output terminal of the first voltage follower is connected to the base of the first transistor. The collector of the first transistor is connected to a power supply, and the emitter of the first transistor is connected to the first resistor. Grounded; the current flow switching unit is connected to the power supply, and the first electrode and the second electrode are respectively connected to the current flow switching unit; when the wearable electronic device is worn by the user so that the first electrode and the second electrode are in contact with the user's skin, and the current flow switching unit is in the first state, the current provided by the power supply flows from the first electrode to the second electrode, and the magnitude of the current is positively correlated with the magnitude of the voltage output terminal of the boost unit; when the wearable electronic device is worn by the user so that the first electrode and the second electrode are in contact with the user's skin, and the current flow switching unit is in the second state, the current flows from the second electrode to the first electrode, and the magnitude of the current is positively correlated with the magnitude of the voltage output terminal of the boost unit.

[0006] In one optional embodiment, the microcurrent output circuit further includes a second voltage follower, a second resistor, and a second transistor; the current flow switching unit includes a first terminal and a second terminal; the non-inverting input terminal of the second voltage follower is connected to the collector of the first transistor, the inverting input terminal of the second voltage follower is connected to the power supply through the second resistor, and the output terminal of the second voltage follower is connected to the base of the second transistor; the emitter of the second transistor is connected to the inverting input terminal of the second voltage follower, the collector of the second transistor is connected to the first terminal of the current flow switching unit, and the second terminal of the current flow switching unit is grounded; when the current flow switching unit is in the first state, the second electrode is grounded through the current flow switching unit; when the current flow switching unit is in the second state, the first electrode is grounded through the current flow switching unit.

[0007] In one optional embodiment, the boost unit includes an inductor, an N-channel MOSFET, a first diode, a first capacitor, and a third resistor; one end of the inductor is the voltage input terminal, and the other end is connected to the drain of the N-channel MOSFET and the anode of the first diode, respectively; the cathode of the first diode is connected to the anode of the first capacitor and one end of the third resistor, respectively, and the anode of the first capacitor is the voltage output terminal; the source of the N-channel MOSFET, the cathode of the first capacitor, and the other end of the third resistor are all grounded; the gate of the N-channel MOSFET is used to receive a control signal to control the boost ratio of the boost unit.

[0008] In one optional embodiment, the current flow switching unit includes a PNP type third transistor, an NPN type fourth transistor, a PNP type fifth transistor, and an NPN type sixth transistor; the collector of the third transistor is connected to the first electrode plate, and the emitter of the third transistor is used to receive the current supplied by the power supply and transmit the current to the first electrode plate; the collector of the fourth transistor is connected to the second electrode plate; the bases of the third and fourth transistors are respectively used to receive a first state control signal to control the operating state of the third and fourth transistors; the collector of the fifth transistor is connected to the second electrode plate, and the emitter of the fifth transistor is used to receive the current supplied by the power supply and transmit the current to the second electrode plate. The second electrode plate; the collector of the sixth transistor is connected to the first electrode plate; the bases of the fifth transistor and the sixth transistor are respectively used to receive second state control signals to control the operating states of the fifth transistor and the sixth transistor; when the first state control signal controls the third transistor and the fourth transistor to be in the on state and the second state control signal controls the fifth transistor and the sixth transistor to be in the off state, the current flow switching unit is in the first state; when the first state control signal controls the third transistor and the fourth transistor to be in the off state and the second state control signal controls the fifth transistor and the sixth transistor to be in the on state, the current flow switching unit is in the second state.

[0009] According to another aspect of the embodiments of this application, a wearable electronic device is provided. It includes a power supply module and a micro-current output circuit as described above, wherein the power supply module is connected to the voltage input terminal and is used to provide voltage to the voltage input terminal.

[0010] In one alternative embodiment, the wearable electronic device further includes a microcontroller unit for outputting control signals to control the boost ratio of the boost unit.

[0011] In one optional embodiment, the wearable electronic device further includes a detection module and an audio module. The detection module is used to detect the user's status data, and the audio module is used to detect audio signals from the user's environment. The microcontroller is used to identify the user's status based on the status data and the audio signals. If the status is a state of preparing to fall asleep, the microcontroller controls the microcurrent output circuit to enter a working state and controls the boost ratio of the boost unit to a first ratio. If the status is a light sleep state, the microcontroller controls the microcurrent output circuit to enter a working state and controls the boost ratio of the boost unit to a second ratio, where the second ratio is less than the first ratio. If the status is a deep sleep state, the microcontroller controls the microcurrent output circuit to stop working.

[0012] In one alternative embodiment, the wearable electronic device further includes an analog-to-digital converter; the audio module includes an audio acquisition unit, a first audio amplification unit, a first filtering unit, a second audio amplification unit, a second filtering unit, and a voltage follower unit; the audio acquisition unit is used to acquire a first audio signal from the user's environment and transmit the first audio signal to the first audio amplification unit; the first audio amplification unit is used to receive the first audio signal, amplify the first audio signal to obtain a second audio signal, and transmit the second audio signal to the first filtering unit; the first filtering unit is used to receive the second audio signal and perform high-frequency filtering on the second audio signal. A third audio signal is obtained and transmitted to the second audio amplification unit; the second audio amplification unit receives the third audio signal, amplifies it to obtain a fourth audio signal, and transmits the fourth audio signal to the second filtering unit; the second filtering unit receives the fourth audio signal, performs low-frequency filtering on it to obtain a fifth audio signal, and transmits the fifth audio signal to the analog-to-digital converter via the voltage follower unit; the analog-to-digital converter receives the fifth audio signal, performs analog-to-digital conversion on it, and transmits the processed audio signal to the microcontroller unit.

[0013] In one optional embodiment, the first audio amplification unit includes a fourth resistor, a second capacitor, a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, and a first operational amplifier; the signal output terminal of the audio acquisition unit is connected to a power supply through the fourth resistor, and the signal output terminal is also connected to the positive terminal of the second capacitor; the negative terminal of the second capacitor is connected to the inverting input terminal of the first operational amplifier through the fifth resistor; the inverting input terminal of the first operational amplifier is also connected to the output terminal of the first operational amplifier through the sixth resistor; the non-inverting input terminal of the first operational amplifier is connected to the first terminal of the seventh resistor, and the second terminal of the seventh resistor is connected to a power supply; the first terminal of the eighth resistor is connected to the first terminal of the seventh resistor, and the second terminal of the eighth resistor is grounded; the first filtering unit includes a third capacitor, a ninth resistor, and a tenth resistor; the output terminal of the first operational amplifier is connected to the positive terminal of the third capacitor; the positive terminal of the third capacitor is grounded through the ninth resistor, and the negative terminal of the third capacitor is connected to the tenth resistor; the first... The second audio amplifier unit includes a second operational amplifier, an eleventh resistor, a twelfth resistor, and a thirteenth resistor. The inverting input of the second operational amplifier is connected to the negative terminal of the third capacitor through the tenth resistor, and also connected to the output of the second operational amplifier through the eleventh resistor. The non-inverting input of the second operational amplifier is connected to the first terminal of the twelfth resistor, and the second terminal of the twelfth resistor is connected to the power supply. The first terminal of the thirteenth resistor is connected to the first terminal of the twelfth resistor, and the second terminal of the thirteenth resistor is grounded. The second filter unit includes a fourteenth resistor, a fourth capacitor, a fifteenth resistor, and a fifth capacitor. The first terminal of the fourteenth resistor is connected to the output of the second operational amplifier, and the second terminal of the fourteenth resistor is connected to the positive terminal of the fourth capacitor. The negative terminal of the fourth capacitor is grounded. The first terminal of the fifteenth resistor is connected to the positive terminal of the fourth capacitor, and the second terminal of the fifteenth resistor is connected to the positive terminal of the fifth capacitor. The positive terminal of the fifth capacitor is connected to the voltage follower unit, and the negative terminal of the fifth capacitor is grounded.

[0014] In one alternative embodiment, the wearable electronic device further includes a fragrance module comprising a vibration unit and a fragrance evaporation unit. The vibration unit comprises a sixteenth resistor, a seventh transistor, a second diode, a motor, and a sixth capacitor. A first terminal of the sixteenth resistor is connected to the base of the seventh transistor, and a second terminal of the sixteenth resistor is used to receive a third state control signal to control the operating state of the seventh transistor. The collector of the seventh transistor is connected to the anode of the second diode, and the cathode of the second diode is connected to a power supply. The power supply pin of the motor is connected to the power supply, and the ground pin of the motor is connected to the collector of the seventh transistor. One end of the sixth capacitor is grounded, and the other end is connected to the power supply. When the third state control signal controls the seventh transistor to be in a conducting state, the motor is in operation and vibrates to cause the fragrance evaporation unit to release fragrance.

[0015] In this embodiment, a microcurrent output circuit for wearable electronic devices is provided. When the wearable electronic device is worn by a user so that the first and second electrode plates of the microcurrent output circuit are in contact with the user's skin, the skin between the first and second electrode plates conducts electricity between them. Therefore, when the current flow switching unit is in operation (first state or second state), the current flows through the first electrode plate, the user's skin, and the second electrode plate, thereby outputting a microcurrent to the user's skin to help the user enter a sleep state. Furthermore, in this embodiment, when the current flow switching unit is in different states, the direction of current flow between the first and second electrode plates changes accordingly, avoiding unidirectional current flow, thereby reducing electrode polarization or corrosion and helping to extend the lifespan of the electrode plates. Moreover, since the first voltage follower can automatically adjust the voltage at its output terminal according to actual conditions so that its output voltage is approximately equal to the input voltage, its output voltage passes through the PN junction between the base and emitter of the transistor, thereby controlling the voltage across the fixed-value first resistor to control the magnitude of the current flowing through the transistor. With the above settings, the current flowing through the transistor can be made unaffected by the voltage between the base and emitter of the transistor, the nonlinear current amplification factor of the transistor, and temperature drift.

[0016] The above description is merely an overview of the technical solutions of the embodiments of this application. In order to better understand the technical means of the embodiments of this application and to implement them in accordance with the contents of the specification, and to make the above and other objects, features and advantages of the embodiments of this application more obvious and understandable, specific implementation methods of this application are described below. Attached Figure Description

[0017] The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0018] Figure 1 A schematic diagram of the microcurrent output circuit provided in an embodiment of this application is shown;

[0019] Figure 2 A schematic diagram of a microcurrent output circuit provided in another embodiment of this application is shown;

[0020] Figure 3 A schematic diagram of a microcurrent output circuit provided in another embodiment of this application is shown;

[0021] Figure 4 A schematic diagram of the structure of the wearable electronic device provided in an embodiment of this application is shown;

[0022] Figure 5 A schematic diagram of the structure of a wearable electronic device according to another embodiment of this application is shown;

[0023] Figure 6 A schematic diagram of the structure of a wearable electronic device according to another embodiment of this application is shown;

[0024] Figure 7 A schematic diagram of the audio module provided in this application is shown;

[0025] Figure 8 A schematic diagram of the structure of a wearable electronic device according to another embodiment of this application is shown;

[0026] Figure 9 A schematic diagram of the vibration unit provided in an embodiment of this application is shown.

[0027] The reference numerals in the detailed embodiments are as follows:

[0028] 10. Wearable electronic devices; 110. Microcurrent output circuit; 120. Power supply module; 130. MCU; 140. Detection module; 150. Audio module; 160. Fragrance module;

[0029] 111. Boost unit; 112. Current flow direction switching unit; 113. First electrode plate; 114. Second electrode plate; 151. Audio acquisition unit; 152. First audio amplification unit; 153. First filtering unit; 154. Second audio amplification unit; 155. Second filtering unit; 156. Voltage follower unit. Detailed Implementation

[0030] Exemplary embodiments of the present application will now be described in more detail with reference to the accompanying drawings. Although exemplary embodiments of the present application are shown in the drawings, it should be understood that the present application may be implemented in various forms and should not be limited to the embodiments set forth herein.

[0031] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0032] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0033] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0034] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, representing any combination of the listed objects. For example, "A and / or B" can represent three possibilities: A exists, A and B exist simultaneously, or B exists. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0035] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).

[0036] In the description of the embodiments of this application, the technical terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0037] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0038] As wearable electronic devices become increasingly prevalent in daily life, their level of intelligence has also significantly improved. Simultaneously, the public's growing emphasis on personal health management has led more and more people to choose to wear such devices during sleep for real-time monitoring and data analysis of their sleep patterns. Building upon this technology, if sleep-aiding circuitry can be integrated into wearable electronic devices, the system could proactively intervene and assist the user in falling asleep as quickly as possible if it detects that the user is preparing to sleep, thus addressing insomnia.

[0039] Microcurrent stimulation is a sleep aid method that uses extremely small currents to stimulate human tissues. By outputting microcurrents to the human body, it can help users fall asleep as quickly as possible. Figure 1 A schematic diagram of a microcurrent output circuit provided in an embodiment of this application is shown. This microcurrent output circuit can be applied to wearable electronic devices. Figure 1 As shown, the micro-current output circuit 110 includes a boost unit 111, a first voltage follower U1A, a transistor Q (first transistor), a resistor R (first resistor), a current flow switching unit 112, a first electrode plate 113, and a second electrode plate 114.

[0040] The voltage input terminal of the boost unit 111 receives voltage VIN, and the voltage output terminal of the boost unit 111 is connected to the non-inverting input terminal of the first voltage follower U1A. After receiving voltage VIN, the boost unit 111 boosts voltage VIN and outputs it to the non-inverting input terminal of the first voltage follower U1A through its voltage output terminal. The inverting input terminal of the first voltage follower U1A is connected to the emitter of transistor Q, and the output terminal of the first voltage follower U1A is connected to the base of transistor Q. The collector of transistor Q is connected to power supply VCC, and the emitter of transistor Q is grounded through resistor R. The current flow switching unit 112 is connected to power supply VCC, and the first electrode plate 113 and the second electrode plate 114 are respectively connected to the current flow switching unit 112.

[0041] When the wearable electronic device is worn by a user so that the first electrode pad 113 and the second electrode pad 114 are in contact with the user's skin, and the current flow switching unit 112 is in the first state, the current supplied by the power supply VCC flows from the first electrode pad 113 to the second electrode pad 114, and the magnitude of the current is positively correlated with the magnitude of the voltage output terminal of the boost unit 111. When the wearable electronic device is worn by a user so that the first electrode pad 113 and the second electrode pad 114 are in contact with the user's skin, and the current flow switching unit 112 is in the second state, the current supplied by the power supply VCC flows from the second electrode pad 114 to the first electrode pad 113, and the magnitude of the current is positively correlated with the magnitude of the voltage output terminal of the boost unit 111.

[0042] In this embodiment, when the wearable electronic device is worn by a user so that the first electrode pad 113 and the second electrode pad 114 are in contact with the user's skin, the skin between the first electrode pad 113 and the second electrode pad 114 conducts electricity between them. Therefore, when the current flow switching unit 112 is in a working state (first state or second state), the current provided by the power supply VCC will flow through the first electrode pad 113, the user's skin, and the second electrode pad 114, thereby outputting a microcurrent to the user's skin to help the user enter a sleep state. Furthermore, in this embodiment, when the current flow switching unit 112 is in different states, the direction of the current provided by the power supply VCC between the first electrode pad 113 and the second electrode pad 114 will change accordingly, avoiding unidirectional current flow, thereby reducing electrode polarization or corrosion and helping to extend the service life of the electrode pads. Furthermore, since the first voltage follower U1A can automatically adjust its output voltage according to actual conditions, making its output voltage approximately equal to its input voltage, the output voltage passes through the PN junction between the base and emitter of transistor Q, thereby controlling the voltage across the fixed resistor R and thus controlling the magnitude of the current flowing through transistor Q. Through this configuration, the current flowing through transistor Q is unaffected by the voltage between the base and emitter of the transistor, the nonlinear current amplification factor of the transistor, and temperature drift.

[0043] Figure 2 A schematic diagram of a microcurrent output circuit according to another embodiment of this application is shown. Figure 2 As shown, in the micro-current output circuit 110, the boost unit 111 includes an inductor L1, an N-channel MOSFET Q1, a first diode D1, a first capacitor C1, and a resistor R1 (a third resistor).

[0044] One end of inductor L1 serves as the voltage input terminal of boost unit 111, receiving power supply VIN. The other end of inductor L1 is connected to the drain of N-channel MOSFET Q1 and the anode of diode D1. The cathode of diode D1 is connected to the anode of first capacitor C1 and one end of resistor R1. The anode of first capacitor C1 is the voltage output terminal of boost unit 111, connected to the non-inverting input terminal of first voltage follower U1A. The source of N-channel MOSFET Q1, the cathode of first capacitor C1, and the other end of resistor R1 are all grounded to GND. The gate of N-channel MOSFET Q1 receives control signals to control the boost ratio of boost unit.

[0045] In this microcurrent output circuit 110, the current flow switching unit 112 includes a PNP transistor Q4 (third transistor), an NPN transistor Q5 (sixth transistor), a PNP transistor Q6 (fifth transistor), and an NPN transistor Q7 (fourth transistor). In the diagram, the left end of resistor R5 is the first electrode 113, and the right end of resistor R5 is the second electrode 114. It is worth noting that resistor R5 is not actually included in the microcurrent output circuit 110. Resistor R5 is only used to illustrate the equivalent resistance between the first electrode 113 and the second electrode 114 and the user's skin when they are in contact. The current flowing through resistor R5 is the current output to the user's skin.

[0046] The collector of transistor Q4 is connected to the first electrode plate 113, the emitter of transistor Q4 is connected to the power supply VCC, and the base of transistor Q4 is used to receive the first state control signal to control the working state of transistor Q4.

[0047] The collector of transistor Q5 is connected to the first electrode plate 113, and the emitter of transistor Q5 is connected to transistor Q2 (i.e., Figure 1 The collector of transistor Q5 is connected, and the base of transistor Q5 is used to receive the second state control signal to control the working state of transistor Q5.

[0048] The collector of transistor Q6 is connected to the second electrode plate 114, the emitter of transistor Q6 is connected to the power supply VCC, and the base of transistor Q6 is used to receive the second state control signal to control the working state of transistor Q6.

[0049] The collector of transistor Q7 is connected to the second electrode plate 114, the emitter of transistor Q7 is connected to the collector of transistor Q2, and the base of transistor Q7 is used to receive the first state control signal to control the operating state of transistor Q7.

[0050] When the first state control signal controls transistors Q4 and Q7 to be in the on state, and the second state control signal controls transistors Q5 and Q6 to be in the off state, the current supplied by power supply VCC flows from transistor Q4 to the first electrode plate 113, the second electrode plate 114 and transistor Q7 in sequence.

[0051] When the first state control signal controls transistors Q4 and Q7 to be in the off state, and the second state control signal controls transistors Q5 and Q6 to be in the on state, the current supplied by power supply VCC flows from transistor Q6 to the second electrode plate 113, the first electrode plate 114 and transistor Q5 in sequence.

[0052] As described above, both the first state control signal and the second state control signal can be provided by the microcontroller unit (MCU) in the wearable electronic device to which the microcurrent output circuit 110 is applied.

[0053] for Figure 2 The provided micro-current output circuit provides a current flowing through resistor R5 equal to the ratio of the voltage at the non-inverting input of the first voltage follower U1A to the resistance of resistor R3. Therefore, by controlling the voltage at the non-inverting input of the first voltage follower U1A, the current flowing through resistor R5 can be controlled, thus controlling the amount of micro-current output to the user. Specifically, by receiving a control signal through the gate of the N-channel MOSFET Q1, the boost ratio of the boost unit can be controlled, thereby controlling the boost ratio of the voltage VIN, and thus controlling the voltage output to the non-inverting input of the first voltage follower U1A, thereby controlling the amount of micro-current output to the user. This control signal can be provided by the MCU in the wearable electronic device using this micro-current output circuit 110, for example, it can be a pulse width modulation (PWM) control signal. Since the first-stage amplifier circuit controls the signal amplification factor through the duty cycle, PWM signal control can be used in this application. Figure 3 A schematic diagram of a microcurrent output circuit according to another embodiment of this application is shown. Figure 3 As shown, in Figure 2 Based on the provided microcurrent output circuit. Figure 3 The provided micro-current output circuit 110 also includes a second voltage follower U1B, resistor R2, resistor R4 (a second resistor), and transistor Q3 (a second transistor). The collector of transistor Q2 is connected to the non-inverting input of the second voltage follower U1B, and the collector of transistor Q2 is also connected to the power supply VCC through resistor R2. The emitter of transistor Q2 is grounded through resistor R3. The inverting input of the second voltage follower U1B is connected to the power supply VCC through resistor R4, and the output of the second voltage follower U1B is connected to the base of transistor Q3. The emitters of transistors Q4 and Q6 are the first terminals of the current flow switching unit 112, and the collector of transistor Q3 is connected to this first terminal. The emitters of transistors Q5 and Q7 are the second terminals of the current flow switching unit 112, and this second terminal is grounded.

[0054] Since the output voltage of the first voltage follower U1A is the same as the input voltage, the voltage at the upper end of resistor R3 is the same as the voltage at the non-inverting input of the first voltage follower U1A. Therefore, the current flowing through resistor R3 can be controlled by the voltage at the non-inverting input of the first voltage follower U1A. Since the current flowing through the collector and emitter is approximately the same when transistor Q2 is turned on, the current flowing through resistor R2 is the same as the current flowing through resistor R3. Therefore, the voltage at the non-inverting input of the second voltage follower U1B is the product of the resistance of resistor R2 and the current flowing through resistor R2. The second voltage follower U1B is similar to the first voltage follower U1A. By controlling the voltage at the non-inverting input of the second voltage follower U1B, the current flowing through resistor R5 can be controlled. The current I flowing through resistor R5 can be determined by the following equation (1).

[0055]

[0056] Wherein, U3 is the voltage at the non-inverting input terminal (pin 3) of the first voltage follower U1A, which is also the voltage output by the boost unit to the first voltage follower U1A. As can be seen from the above equation (1), by controlling the value of U3, the current flowing through resistor R5 can be controlled (that is, the current output to the user's skin can be controlled).

[0057] In this embodiment of the application, by setting a second voltage follower U1B, the low end of the load is grounded, that is, the current can flow into the ground after passing through the resistor R5, thereby avoiding energy waste.

[0058] Figure 4 A schematic diagram of the structure of a wearable electronic device provided in an embodiment of this application is shown. Figure 4 As shown, the wearable electronic device 10 includes a microcurrent output circuit 110 and a power supply module 120. The power supply module 120 provides a voltage VIN to the microcurrent output circuit 110 so that the microcurrent output circuit 110 outputs a microcurrent to the user wearing the wearable electronic device 10, thereby helping the user to enter a sleep state.

[0059] In order to control the magnitude of the microcurrent output by the microcurrent output circuit to the user, the wearable electronic device 10 in this embodiment of the application also includes an MCU. Figure 5 A schematic diagram of the structure of a wearable electronic device according to another embodiment of this application is shown. Figure 5 As shown, the wearable electronic device 10 also includes an MCU 130, and a power supply module 120 is connected to the MCU 130 to provide operating voltage to the MCU 130. The MCU 130 is connected to a micro-current output circuit 110, which outputs control signals to control the boost ratio of the boost unit. For details, please refer to... Figure 2 and Figure 3The micro-current output circuit 110 and MCU 130 control the boost ratio of the boost unit by sending a PWM control signal to the gate of the N-channel MOSFET Q1. This causes the boost unit to boost the voltage VIN according to the boost ratio and output it to the non-inverting input of the first voltage follower U1A, thereby controlling the current flowing through resistor R5. The comparison between the user's state and the boost ratio can be preset. Once the user's state is determined, the boost ratio corresponding to that state can be determined based on this relationship.

[0060] Figure 6 A schematic diagram of the structure of a wearable electronic device according to another embodiment of this application is shown. Figure 6 As shown, the wearable electronic device 10 also includes a detection module 140 and an audio module 150, both of which are connected to the MCU 130.

[0061] The detection module 140 detects the user's status data and transmits the detected status data to the MCU 130, so that the MCU 130 can control the micro-current output circuit 110 to output a micro-current to the user in a timely manner based on the user's status data. The detection module 140 may integrate an accelerometer for collecting the user's acceleration and a heart rate sensor for collecting the user's heart rate. When the user is in motion, the user's acceleration is usually greater than zero, and the heart rate is relatively high. When the user is not in a sleep state, if the user is not moving, such as watching TV or listening to music, the user's acceleration is relatively low (e.g., zero), and the heart rate is relatively low. When the user is in a sleep state, the user's acceleration is usually zero, and the heart rate is relatively low. Furthermore, when the user is in a sleep state, the environment is usually relatively quiet, i.e., there is no external television sound, conversation, etc. Therefore, by combining the user's acceleration, heart rate, and the audio signal of the user's environment, the user's status can be determined relatively accurately. The user's status includes non-sleep state, preparing to fall asleep state, light sleep state, and deep sleep state.

[0062] The detection module 140 continuously collects the user's acceleration and heart rate, and transmits the collected data to the MCU 130. Similarly, the audio module 150 continuously collects audio signals from the user's environment and transmits the collected audio signals to the MCU 130. The MCU 130 determines the user's state based on the received acceleration, heart rate, and audio signals. Specifically, different acceleration and heart rate ranges corresponding to different states can be preset. After the MCU 130 acquires the acceleration, heart rate, and audio signals, it can determine the user's state by determining the range to which the acquired acceleration and heart rate belong, and whether the audio signal is television sound, conversation, etc. For example, the acceleration interval for non-sleep state can be set to [a1, b1], the acceleration interval for preparing to fall asleep state to [c1, d1], the acceleration interval for light sleep state to [e1, f1], and the acceleration interval for deep sleep state to [g1, h1]. Similarly, the heart rate interval for non-sleep state can be set to [a2, b2], the heart rate interval for preparing to fall asleep state to [c2, d2], the heart rate interval for light sleep state to [e2, f2], and the heart rate interval for deep sleep state to [g2, h2]. The MCU 130 determines the user's state by determining the intervals to which the received acceleration and heart rate belong, and by checking if the audio signal is television sound, conversation, etc. The characters in the above intervals are for illustrative purposes only.

[0063] After determining the user's state, MCU 130 sends a control signal to the gate of N-channel MOSFET Q1 to control the boost ratio of the boost unit, thereby controlling the magnitude of the micro-current output to the user. Specifically, the boost ratio corresponding to each state can be preset as needed, and the corresponding boost ratio can be determined after determining the user's state. If the user is in a state of preparing to fall asleep, MCU 130 controls the micro-current output circuit 110 to enter the working state and controls the boost ratio of the boost unit to the first ratio to output a larger micro-current to the user, thereby helping the user fall asleep quickly. If the user is in a light sleep state, MCU 130 controls the micro-current output circuit 110 to enter the working state and controls the boost ratio of the boost unit to the second ratio (less than the first ratio) to output a smaller micro-current to the user, thereby helping the user fall into a deep sleep state quickly. If the user is in a deep sleep state, MCU 130 controls the micro-current output circuit 110 to stop working, thereby reducing the power consumption of the wearable electronic device 10.

[0064] It is worth noting that the way the aforementioned MCU 130 determines the user's state based on the received acceleration, heart rate, and audio signals can be achieved using existing technology. In other words, existing MCUs can determine the target interval to which the data belongs in multiple intervals, as well as identify the ambient audio signals, and determine the user's state based on the state corresponding to the target interval and the ambient audio signals.

[0065] In this embodiment, when the user is preparing to fall asleep, a larger microcurrent is output to the user to help the user fall asleep as quickly as possible. However, if a larger microcurrent is continuously output to the user, it will reduce the battery life of the wearable electronic device 10. Therefore, when the user is detected to be in a light sleep state, the microcurrent output to the user is reduced, and when the user is detected to be in a deep sleep state, the microcurrent output to the user is stopped, thereby extending the battery life of the wearable electronic device 10.

[0066] Figure 7 A schematic diagram of the audio module provided in this application is shown. (As shown) Figure 7 As shown, the audio module 150 includes an audio acquisition unit 151, a first audio amplification unit 152, a first filtering unit 153, a second audio amplification unit 154, a second filtering unit 155, and a voltage follower unit 156. Among them,

[0067] The first audio amplification unit 152 includes resistor R6 (fourth resistor), capacitor C2 (second capacitor), resistor R7 (fifth resistor), resistor R8 (sixth resistor), resistor R9 (seventh resistor), resistor R10 (eighth resistor) and operational amplifier U2 (first operational amplifier).

[0068] The signal output terminal of the audio acquisition unit 151 is connected to the power supply through resistor R6, and is also connected to the positive terminal of capacitor C2. The negative terminal of capacitor C2 is connected to the inverting input terminal of operational amplifier U2 through resistor R7, and the inverting input terminal of operational amplifier U2 is also connected to the output terminal of operational amplifier U2 through resistor R8. The non-inverting input terminal of operational amplifier U2 is connected to the first end of resistor R9, the second end of resistor R9 is connected to power supply VCC_5, the first end of resistor R10 is connected to the first end of resistor R9, and the second end of resistor R10 is grounded. After acquiring the first audio signal, the audio acquisition unit 151 transmits the first audio signal to the first audio amplification unit 152. The first audio amplification unit 152 receives the first audio signal, amplifies it to obtain the second audio signal, and transmits the second audio signal to the first filtering unit 153.

[0069] The first filtering unit 153 includes capacitor C3 (the third capacitor), resistor R11 (the ninth resistor), and resistor R12 (the tenth resistor). The output terminal of operational amplifier U2 is connected to the positive terminal of capacitor C3, which is grounded through resistor R11. The negative terminal of capacitor C3 is connected to resistor R12. The first filtering unit 153 receives the second audio signal, performs high-frequency filtering on it to obtain a third audio signal, and transmits the third audio signal to the second audio amplification unit 154.

[0070] The second audio amplification unit 154 includes operational amplifier U3 (second operational amplifier), resistor R13 (eleventh resistor), resistor R14 (twelfth resistor), and resistor R15 (thirteenth resistor). The inverting input terminal of operational amplifier U3 is connected to the negative terminal of capacitor C3 through resistor R12, and also connected to the output terminal of operational amplifier U3 through resistor R13. The non-inverting input terminal of operational amplifier U3 is connected to the first terminal of resistor R14, and the second terminal of resistor R14 is connected to power supply VCC_5. The first terminal of resistor R15 is connected to the first terminal of resistor R14, and the second terminal of resistor R14 is grounded. The second audio amplification unit 154 receives a third audio signal, amplifies the third audio signal to obtain a fourth audio signal, and transmits the fourth audio signal to the second filtering unit 155.

[0071] The second filtering unit 155 includes a resistor R16 (the fourteenth resistor), a capacitor C4 (the fourth capacitor), a resistor R17 (the fifteenth resistor), and a capacitor C5 (the fifth capacitor). The first terminal of resistor R16 is connected to the output terminal of operational amplifier U3, and the second terminal of resistor R16 is connected to the positive terminal of capacitor C4. The negative terminal of capacitor C4 is grounded. The first terminal of resistor R17 is connected to the positive terminal of capacitor C4, and the second terminal of resistor R17 is connected to the positive terminal of capacitor C5. The positive terminal of capacitor C5 is connected to the voltage follower unit, and the negative terminal of capacitor C5 is grounded. The second filtering unit 155 receives the fourth audio signal, performs low-frequency filtering on the fourth audio signal to obtain the fifth audio signal, and transmits the fifth audio signal to the analog-to-digital converter via the voltage follower unit.

[0072] The voltage follower unit 156 includes an operational amplifier U4 and a resistor R18. The non-inverting input of operational amplifier U4 is connected to the positive terminal of capacitor C5, and the inverting input of operational amplifier U4 is connected to its output through resistor R18. The voltage follower unit 156 can be used for impedance transformation, acting as an isolation buffer to ensure the signal is transmitted to the subsequent analog-to-digital converter (ADC) without attenuation. The ADC receives the fifth audio signal, performs analog-to-digital conversion on it, and transmits the processed audio signal to the MCU 130.

[0073] Figure 8 A schematic diagram of the structure of a wearable electronic device according to another embodiment of this application is shown. Figure 8 As shown, the wearable electronic device 10 also includes a fragrance module 160, which is connected to the MCU 130. The fragrance module 160 includes a vibration unit and a fragrance evaporation unit. Figure 9 A schematic diagram of the vibration unit provided in an embodiment of this application is shown. (As shown...) Figure 9As shown, the vibration unit includes resistor R19 (sixteenth resistor), transistor Q8 (seventh transistor), diode D2 (second diode), capacitor C6 (sixth capacitor), and motor U5. One end of resistor R19 receives the third-state control signal sent by MCU 130 to control the operating state of transistor Q8. The other end of resistor R19 is connected to the base of transistor Q8. The collector of transistor Q8 is connected to the anode of diode D2, and the cathode of diode D2 is connected to the power supply VCC. The power supply pin (pin 1) of motor U5 is connected to the power supply VCC, and the ground pin (pin 2) of the motor is connected to the collector of transistor Q8. One end of capacitor C6 is grounded, and the other end is connected to the power supply VCC. When the MCU 130 determines that the user is in a state of preparing to fall asleep or in a light sleep state, the MCU 130 sends a third state control signal to the vibration unit to control the transistor Q8 to be in the conducting state. After the transistor Q8 is turned on, the motor U5 enters the working state and vibrates. Since the vibration unit is connected to the fragrance evaporation unit, the vibration of the motor U5 can cause the fragrance evaporation unit to evaporate fragrance to help the user fall asleep.

[0074] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A microcurrent output circuit, applied to wearable electronic devices, characterized in that, It includes a boost unit, a first voltage follower, a first transistor, a first resistor, a current flow switching unit, a first electrode plate, and a second electrode plate; The boost unit includes a voltage input terminal and a voltage output terminal. The voltage input terminal is used to receive voltage, and the voltage output terminal is connected to the non-inverting input terminal of the first voltage follower. The boost unit is used to boost the received voltage and output it to the non-inverting input terminal of the first voltage follower. The inverting input terminal of the first voltage follower is connected to the emitter of the first transistor, and the output terminal of the first voltage follower is connected to the base of the first transistor. The collector of the first transistor is connected to the power supply, and the emitter of the first transistor is grounded through the first resistor; The current flow direction switching unit is connected to the power supply, and the first electrode plate and the second electrode plate are respectively connected to the current flow direction switching unit; When the wearable electronic device is worn by a user so that the first electrode and the second electrode are in contact with the user's skin, and the current flow switching unit is in the first state, the current supplied by the power supply flows from the first electrode to the second electrode, and the magnitude of the current is positively correlated with the magnitude of the voltage output by the voltage output terminal of the boost unit; When the wearable electronic device is worn by a user so that the first electrode and the second electrode are in contact with the user's skin, and the current flow switching unit is in the second state, the current flows from the second electrode to the first electrode, and the magnitude of the current is positively correlated with the magnitude of the voltage output by the voltage output terminal of the boost unit.

2. The micro-current output circuit according to claim 1, characterized in that, The microcurrent output circuit also includes a second voltage follower, a second resistor, and a second transistor; the current flow switching unit includes a first terminal and a second terminal. The non-inverting input terminal of the second voltage follower is connected to the collector of the first transistor, the inverting input terminal of the second voltage follower is connected to the power supply through the second resistor, and the output terminal of the second voltage follower is connected to the base of the second transistor. The emitter of the second transistor is connected to the inverting input of the second voltage follower, the collector of the second transistor is connected to the first terminal of the current flow switching unit, and the second terminal of the current flow switching unit is grounded. When the current flow direction switching unit is in the first state, the second electrode plate is grounded through the current flow direction switching unit; When the current flow direction switching unit is in the second state, the first electrode plate is grounded through the current flow direction switching unit.

3. The micro-current output circuit according to claim 1, characterized in that, The boost unit includes an inductor, an N-channel MOSFET, a first diode, a first capacitor, and a third resistor; One end of the inductor is the voltage input terminal, and the other end is connected to the drain of the N-channel MOSFET and the anode of the first diode, respectively. The cathode of the first diode is connected to the positive terminal of the first capacitor and one end of the third resistor, respectively, and the positive terminal of the first capacitor is the voltage output terminal; The source of the N-channel MOS transistor, the negative terminal of the first capacitor, and the other end of the third resistor are all grounded. The gate of the N-channel MOS transistor is used to receive control signals to control the boost ratio of the boost unit.

4. The micro-current output circuit according to claim 1, characterized in that, The current flow switching unit includes a PNP type third transistor, an NPN type fourth transistor, a PNP type fifth transistor, and an NPN type sixth transistor. The collector of the third transistor is connected to the first electrode plate, and the emitter of the third transistor is used to receive the current provided by the power supply and transmit the current to the first electrode plate. The collector of the fourth transistor is connected to the second electrode plate; The bases of the third transistor and the fourth transistor are respectively used to receive the first state control signal to control the working state of the third transistor and the fourth transistor. The collector of the fifth transistor is connected to the second electrode plate, and the emitter of the fifth transistor is used to receive the current provided by the power supply and transmit the current to the second electrode plate; The collector of the sixth transistor is connected to the first electrode plate; The bases of the fifth transistor and the sixth transistor are respectively used to receive the second state control signal to control the operating state of the fifth transistor and the sixth transistor. When the first state control signal controls the third transistor and the fourth transistor to be in the on state, and the second state control signal controls the fifth transistor and the sixth transistor to be in the off state, the current flow switching unit is in the first state; When the first state control signal controls the third and fourth transistors to be in the off state, and the second state control signal controls the fifth and sixth transistors to be in the on state, the current flow switching unit is in the second state.

5. A wearable electronic device, characterized in that, It includes a power supply module and a micro-current output circuit as described in any one of claims 1 to 4, wherein the power supply module is connected to the voltage input terminal and is used to provide voltage to the voltage input terminal.

6. The wearable electronic device according to claim 5, characterized in that, The wearable electronic device also includes a microcontroller unit, which outputs control signals to control the boost ratio of the boost unit.

7. The wearable electronic device according to claim 6, characterized in that, The wearable electronic device also includes a detection module and an audio module. The detection module is used to detect the user's status data, and the audio module is used to detect the audio signals of the user's environment. The microcontroller unit is used to identify the user's status based on the status data and the audio signal; If the state is a state of preparing to fall asleep, the microcontroller controls the microcurrent output circuit to enter the working state and controls the boost ratio of the boost unit to the first ratio. If the state is a light sleep state, the microcontroller controls the microcurrent output circuit to enter the working state and controls the boost ratio of the boost unit to a second ratio, which is less than the first ratio; If the state is a deep sleep state, the microcontroller controls the microcurrent output circuit to stop working.

8. The wearable electronic device according to claim 7, characterized in that, The wearable electronic device also includes an analog-to-digital converter; The audio module includes an audio acquisition unit, a first audio amplification unit, a first filtering unit, a second audio amplification unit, a second filtering unit, and a voltage follower unit; The audio acquisition unit is used to acquire a first audio signal of the user's environment and transmit the first audio signal to the first audio amplification unit. The first audio amplification unit is used to receive the first audio signal, amplify the first audio signal to obtain a second audio signal, and transmit the second audio signal to the first filtering unit; The first filtering unit is used to receive the second audio signal, perform high-frequency filtering on the second audio signal to obtain a third audio signal, and transmit the third audio signal to the second audio amplification unit; The second audio amplification unit is used to receive the third audio signal, amplify the third audio signal to obtain a fourth audio signal, and transmit the fourth audio signal to the second filtering unit; The second filtering unit is used to receive the fourth audio signal, perform low-frequency filtering on the fourth audio signal to obtain the fifth audio signal, and transmit the fifth audio signal to the analog-to-digital converter through the voltage follower unit; The analog-to-digital converter is used to receive the fifth audio signal, perform analog-to-digital conversion on the fifth audio signal, and transmit the processed audio signal to the microcontroller unit.

9. The wearable electronic device according to claim 8, characterized in that, The first audio amplification unit includes a fourth resistor, a second capacitor, a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, and a first operational amplifier; The signal output terminal of the audio acquisition unit is connected to the power supply through the fourth resistor, and the signal output terminal is also connected to the positive terminal of the second capacitor. The negative terminal of the second capacitor is connected to the inverting input terminal of the first operational amplifier through the fifth resistor; The inverting input terminal of the first operational amplifier is also connected to the output terminal of the first operational amplifier through the sixth resistor; The non-inverting input terminal of the first operational amplifier is connected to the first terminal of the seventh resistor, and the second terminal of the seventh resistor is connected to the power supply. The first end of the eighth resistor is connected to the first end of the seventh resistor, and the second end of the eighth resistor is grounded; The first filter unit includes a third capacitor, a ninth resistor, and a tenth resistor; The output terminal of the first operational amplifier is connected to the positive terminal of the third capacitor; The positive terminal of the third capacitor is grounded through the ninth resistor, and the negative terminal of the third capacitor is connected to the tenth resistor; The second audio amplification unit includes a second operational amplifier, an eleventh resistor, a twelfth resistor, and a thirteenth resistor; The inverting input terminal of the second operational amplifier is connected to the negative terminal of the third capacitor through the tenth resistor, and is also connected to the output terminal of the second operational amplifier through the eleventh resistor; The non-inverting input of the second operational amplifier is connected to the first end of the twelfth resistor, and the second end of the twelfth resistor is connected to the power supply. The first end of the thirteenth resistor is connected to the first end of the twelfth resistor, and the second end of the thirteenth resistor is grounded; The second filter unit includes a fourteenth resistor, a fourth capacitor, a fifteenth resistor, and a fifth capacitor; The first end of the fourteenth resistor is connected to the output terminal of the second operational amplifier, and the second end of the fourteenth resistor is connected to the positive terminal of the fourth capacitor. The negative terminal of the fourth capacitor is grounded; The first end of the fifteenth resistor is connected to the positive terminal of the fourth capacitor, and the second end of the fifteenth resistor is connected to the positive terminal of the fifth capacitor. The positive terminal of the fifth capacitor is connected to the voltage follower unit, and the negative terminal of the fifth capacitor is grounded.

10. The wearable electronic device according to claim 7, characterized in that, The wearable electronic device also includes a fragrance module, which comprises a vibration unit and a fragrance evaporation unit; The vibration unit includes a sixteenth resistor, a seventh transistor, a second diode, a motor, and a sixth capacitor; The first end of the sixteenth resistor is connected to the base of the seventh transistor, and the second end of the sixteenth resistor is used to receive a third state control signal to control the working state of the seventh transistor. The collector of the seventh transistor is connected to the anode of the second diode, and the cathode of the second diode is connected to the power supply. The motor's power supply pin is connected to the power supply, and the motor's ground pin is connected to the collector of the seventh transistor. One end of the sixth capacitor is grounded, and the other end is connected to the power supply; When the third state control signal controls the seventh transistor to be in the conducting state, the motor is in working state and vibrates, so that the fragrance evaporation unit evaporates fragrance.

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