Cosmetic apparatus and pulse output circuit thereof

Abstract

The application relates to the field of beauty instruments, and provides a beauty instrument and a pulse output circuit thereof. The pulse output circuit comprises a control unit, a voltage conversion unit and a current output unit. The control unit is connected with the voltage conversion unit and the current output unit, and the current output unit is connected with the control unit and the voltage conversion unit. The current output unit is configured with a first output node and a second output node. The first output node is used for connecting a first contact pole piece, and the second output node is used for connecting a second contact pole piece. A voltage control signal is output by the control unit, and a corresponding target voltage is output by the voltage conversion unit according to the voltage control signal, so that when a current pulse is generated according to a PWM signal and the target voltage, the action intensity of the current pulse can be changed according to the target voltage. A pulse output scheme of the beauty instrument with a wider application range is provided.

Description

Technical Field

[0001] This application belongs to the field of beauty devices, and in particular relates to a beauty device and its pulse output circuit. Background Technology

[0002] Beauty devices can output physical energy to act on the user's skin, thereby achieving skin care and beauty effects. For example, there are beauty devices that output light energy, heat energy, and electrical pulses. Beauty devices that output electrical pulses operate in different modes by using different current pulse frequencies.

[0003] However, because different users have varying sensitivities or tolerance levels to electrical pulses, even changing the frequency of the electrical pulses may result in some users not experiencing a noticeable sensation or having a poor effect on their skin when using the beauty device. Therefore, there is an urgent need to provide a pulse output solution for beauty devices with a wider range of applications. Utility Model Content

[0004] The purpose of this application is to provide a beauty device and its pulse output circuit, aiming to provide a pulse output solution for beauty devices with a wider range of applications.

[0005] A first aspect of this application provides a pulse output circuit for a beauty device, wherein the beauty device is configured with a first contact electrode and a second contact electrode spaced apart, and the pulse output circuit includes:

[0006] The control unit is used to output PWM signals and voltage control signals.

[0007] A voltage conversion unit, connected to the control unit, is used to output the target voltage according to the voltage control signal;

[0008] The current output unit is connected to the control unit and the voltage conversion unit respectively. The current output unit is configured with a first output node and a second output node. The first output node is used to connect to the first contact electrode, and the second output node is used to connect to the second contact electrode.

[0009] The current output unit is used to generate a current pulse based on the PWM signal and the target voltage when the first contact electrode and the second contact electrode are in contact with the skin, and to apply the current pulse to the skin through the first contact electrode and the second contact electrode.

[0010] The second aspect of this application provides a beauty device, including the pulse output circuit of the beauty device provided in the first aspect.

[0011] The beneficial effects of this utility model embodiment compared with the prior art are as follows: The pulse output circuit of the above-mentioned beauty device includes a control unit, a voltage conversion unit, and a current output unit. The control unit is connected to both the voltage conversion unit and the current output unit, and the current output unit is connected to both the control unit and the voltage conversion unit. The current output unit is configured with a first output node and a second output node. The first output node is used to connect to a first contact electrode, and the second output node is used to connect to a second contact electrode. By using the PWM signal output by the control unit and the voltage control signal, the voltage conversion unit can output a target voltage according to the voltage control signal. This allows the current output unit to generate a current pulse based on the PWM signal and the target voltage when the first and second contact electrodes contact the skin, and then apply the current pulse to the skin through the first and second contact electrodes. Based on this, by using the voltage control signal output by the control unit and the corresponding target voltage output by the voltage conversion unit according to the voltage control signal, the intensity of the current pulse generated by the current output unit according to the PWM signal and the target voltage can change according to the change in the target voltage. In this way, it can meet the needs of users for different sizes or intensities of current pulses, and provide a pulse output solution for beauty devices with a wider range of applications. Attached Figure Description

[0012] Figure 1 A schematic diagram of the pulse output circuit of a beauty device provided in this application embodiment;

[0013] Figure 2 A schematic diagram of the pulse output circuit of a beauty device provided in another embodiment of this application;

[0014] Figure 3 A schematic diagram of the pulse output circuit of a beauty device provided in an embodiment of this application;

[0015] Figure 4 This is a specific circuit diagram of a boost circuit in an embodiment of this application;

[0016] Figure 5 A schematic diagram of the pulse output circuit of a beauty device provided in another embodiment of this application;

[0017] Figure 6 This is a schematic diagram of a specific structure of the detection unit in an embodiment of this application;

[0018] Figure 7 A specific circuit diagram of the current output unit in the pulse output circuit of a beauty device provided in this application embodiment;

[0019] Figure 8This is a schematic diagram of the structure of a beauty device provided in an embodiment of this application. Detailed Implementation

[0020] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.

[0021] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0022] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., 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 this application and simplifying the description, and do not 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 this application.

[0023] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0024] For example, beauty devices can output physical energy to act on the user's skin, thereby achieving skin care and beauty effects. Examples include beauty devices that output light energy, heat energy, and electrical pulses. For beauty devices that output electrical pulses, different current pulse frequencies are used to define different operating states.

[0025] However, because different users have varying sensitivities or tolerance levels to electrical pulses, even changing the frequency of the electrical pulses may result in some users not experiencing a noticeable sensation or having a poor effect on their skin when using the beauty device. Therefore, there is an urgent need to provide a pulse output solution for beauty devices with a wider range of applications.

[0026] To address the aforementioned technical problems, this application provides a pulse output circuit for a beauty device, comprising: a control unit, a voltage conversion unit, and a current output unit. The control unit is connected to both the voltage conversion unit and the current output unit, and the current output unit is connected to both the control unit and the voltage conversion unit. The current output unit is configured with a first output node and a second output node. The first output node is used to connect to a first contact electrode, and the second output node is used to connect to a second contact electrode. By using a PWM signal output by the control unit in conjunction with a voltage control signal, the voltage conversion unit can output a target voltage according to the voltage control signal. This allows the current output unit to generate a current pulse based on the PWM signal and the target voltage when the first and second contact electrodes are in contact with the skin, and then apply the current pulse to the skin through the first and second contact electrodes. Based on this, by using a voltage control signal output by the control unit and then having the voltage conversion unit output a corresponding target voltage according to the voltage control signal, the intensity of the current pulse generated by the current output unit based on the PWM signal and the target voltage can vary according to changes in the target voltage. In this way, it can meet the needs of users for different sizes or intensities of current pulses, and provide a pulse output solution for beauty devices with a wider range of applications.

[0027] See Figure 1 , Figure 1 A schematic diagram of the pulse output circuit of a beauty device according to an embodiment of this application is shown. For ease of explanation, only the parts relevant to this embodiment are shown, and are described in detail below:

[0028] exist Figure 1 In this beauty device, a first contact electrode 110 and a second contact electrode 120 are spaced apart. The pulse output circuit 100 of the beauty device includes: a control unit 10, a voltage conversion unit 20, and a current output unit 30. Specifically:

[0029] Control unit 10 is used to output PWM signal and voltage control signal.

[0030] The voltage conversion unit 20 is connected to the control unit 10 and is used to output the target voltage according to the voltage control signal.

[0031] The current output unit 30 is connected to the control unit 10 and the voltage conversion unit 20, respectively. The current output unit 30 is configured with a first output node 31 and a second output node 32. The first output node 31 is used to connect to the first contact electrode 110, and the second output node 32 is used to connect to the second contact electrode 120.

[0032] The current output unit 30 is used to generate a current pulse based on the PWM signal and the target voltage when the first contact electrode 110 and the second contact electrode 120 are in contact with the skin, and to apply the current pulse to the skin through the first contact electrode 110 and the second contact electrode 120.

[0033] In this embodiment, the PWM signal pair output by the control unit 10 acts on the current output unit 30, and the voltage control signal output by the control unit 10 is used to control the voltage conversion unit 20 to output the target voltage. Here, the PWM signal pair can be regarded as the driving signal of the current output unit 30, and the PWM signal pair refers to two sets of PWM signals with complementary frequencies within a unit cycle. In specific implementation, the PWM signal pair can be a signal pair provided by the control unit 10, or a signal pair output by the driving unit (not shown in the figure) integrated in the control unit 10, and there is no limitation here.

[0034] For example, in a specific implementation, the PWM signal pair may include a first PWM signal and a second PWM signal, and the frequencies of the first PWM signal and the second PWM signal are complementary within a unit cycle. Here, frequency complementarity means that at any given moment, only one of the first PWM signal and the second PWM signal is at a high level. For example, when the first PWM signal is at a high level, the second PWM signal is at a low level, and when the second PWM signal is at a high level, the first PWM signal is at a low level. This alternation can output alternating current pulses through the first output node 31 and the second output node 32 of the current output unit 30, thereby acting on the skin through the first contact electrode 110 and the second contact electrode 120.

[0035] It should be noted that in all embodiments of this application, the target voltage generally refers to the voltage output by the voltage conversion unit 20 according to the voltage control signal. That is, in order to meet the requirements of different output voltages, the control unit 10 can output different voltage control signals to the voltage conversion unit 20, thereby enabling the voltage conversion unit 20 to output different target voltages according to different voltage control signals.

[0036] Based on this, when the current output unit 30 generates a current pulse according to the target voltage based on the PWM signal, it can generate current pulses with different amplitudes / intensities according to different target voltages to meet the user's needs for different stimulation intensities.

[0037] For example, in a specific implementation, the voltage control signal output by the control unit 10 is a DC signal or a PWM voltage regulation signal.

[0038] It's easy to understand that in actual implementation, when the voltage control signal is a PWM voltage regulation signal, this PWM voltage regulation signal is different from the PWM signal pair. Specifically, the PWM voltage regulation signal is used to control the target voltage output by the voltage conversion unit 20. That is, the PWM voltage regulation signal is related to the target voltage. In contrast, the PWM signal pair can be considered as the drive signal of the current output unit 30. For example, the PWM signal pair may include a first PWM signal and a second PWM signal, and the frequencies of the first PWM signal and the second PWM signal are complementary within a unit period. That is, there is a frequency complementarity between the PWM signal pairs.

[0039] It is understood that the first output node 31 and the second output node 32 of the current output unit 30 are connected to the first contact electrode 110 and the second contact electrode 120, respectively. Therefore, when the first contact electrode 110 and the second contact electrode 120 simultaneously contact the skin, the skin can act as a conductor between them, connecting them to form a closed loop with the first output node 31 and the second output node 32 in the current output unit 30. Thus, when alternating current pulses are output through the first output node 31 and the second output node 32, they can act on the skin through the first contact electrode 110 and the second contact electrode 120.

[0040] In this embodiment, the first output node 31 of the current output unit 30 can also be regarded as the first output terminal of the current output unit 30. Similarly, the second output node 32 of the current output unit 30 can also be regarded as the second output terminal of the current output unit 30.

[0041] In a specific implementation, the current output unit 30 can be a circuit unit composed of at least two switching circuits, or it can be a chip unit including at least two switching circuits. Accordingly, the first output node 31 and the second output node 32 can be solder points of the current output unit 30 on the circuit board, or two pins of the current output unit 30. Through internal wiring of the beauty device, they can be connected to the first contact electrode 110 and the second contact electrode 120.

[0042] It can be understood that the current output unit 30 can be an EMS output unit. When the first contact electrode 110 and the second contact electrode 120 are in contact with the skin, the current output unit 30 generates an EMS pulse based on the current pulse generated by the PWM signal and the target voltage. In addition, the current output unit 30 can also be a radio frequency output unit for outputting radio frequency current to the skin.

[0043] For example, the current pulse generally refers to a pulsed current from 1 Hz to 1500 Hz. When applied to the skin through the first contact electrode 110 and the second contact electrode 120, the pulsed current can specifically be two sets of pulsed currents that flow in opposite directions and appear alternately.

[0044] For example, the direction of the first pulse current is from the first contact electrode 110, through the skin to the second contact electrode 120, and the direction of the second pulse current is from the second contact electrode 120, through the skin to the first contact electrode 110.

[0045] For example, the direction of the first pulse current is from the second contact electrode 120, through the skin to the first contact electrode 110, and the direction of the second pulse current is from the first contact electrode 110, through the skin to the second contact electrode 120.

[0046] As an example, the specific intensity of the current pulse can be configured according to actual needs. For instance, different target voltage ranges can be corresponding to different operating modes or voltage levels. For example, in the first mode, the target current value is 5V–10V. In the second mode, the target current value is 11V–24.5V. In the third mode, the target current value is 25V–39V. In the fourth mode, the target current value is 39.5V–53V, and so on.

[0047] As another example, the specific frequency range of the current pulse can also be configured according to actual needs. For instance, the frequency range of the current pulse can be configured based on different operating modes or speed settings. For example, in the first operating mode, the frequency range of the current pulse could be 1 Hz to 5 Hz. In the second operating mode, the frequency range of the current pulse could be 10 Hz to 15 Hz. In the third operating mode, the frequency range of the current pulse could be 20 Hz to 25 Hz, and so on.

[0048] The above solution utilizes the voltage control signal output by the control unit 10, and then the voltage conversion unit 20 outputs a corresponding target voltage according to the voltage control signal. This allows the current output unit 30 to generate current pulses based on the target voltage using a PWM signal, and the intensity of these current pulses can vary according to the target voltage. In this way, it can meet the user's needs for different magnitudes or intensities of current pulses, providing a pulse output solution for beauty devices with a wider range of applications.

[0049] Figure 2 A schematic diagram of the pulse output circuit of a beauty device according to another embodiment of this application is shown. Figure 2 As shown, in one embodiment, the current output unit 30 is also configured with a loop node 33 for coupling to ground.

[0050] In this embodiment, loop node 33 can be regarded as the ground connection terminal of current output unit 30, or loop connection terminal, for coupling to ground.

[0051] It is easy to understand that, similar to the first output node 31 and / or the second output node 32, since the loop node 33 can be regarded as the ground connection terminal or loop connection terminal of the current output unit 30, in specific implementation, the loop node 33 can also be the ground solder point of the current output unit 30 on the circuit board, or the ground pin of the current output unit 30.

[0052] Figure 3 A schematic diagram of the pulse output circuit of a beauty device according to an embodiment of this application is shown. Figure 3 As shown, the voltage conversion unit 20 includes a first voltage conversion unit 21 and a second voltage conversion unit 22. Specifically:

[0053] The first voltage conversion unit 21 is connected to the control unit 10 and the current output unit 30, respectively. The first voltage conversion unit 21 outputs a first target voltage to the current output unit 30 according to a first voltage control signal output by the control unit 10. The second voltage conversion unit 22 is also connected to the control unit 10 and the current output unit 30, respectively. The second voltage conversion unit 22 outputs a second target voltage to the current output unit 30 according to a second voltage control signal output by the control unit 10. The first target voltage and the second target voltage may be the same or different.

[0054] Combination Figures 1 to 3 In this embodiment, under the action of the PWM signal pair, the current output unit 30 can output alternating current pulses through the first output node 31 and the second output node 32, thereby acting on the skin through the first contact electrode 110 and the second contact electrode 120. Based on this, the first voltage conversion unit 21 can output a first target voltage to the current output unit 30 according to the first voltage control signal output by the control unit 10, and the second voltage conversion unit 22 can output a second target voltage to the current output unit 30 according to the second voltage control signal output by the control unit 10. Thus, the current output unit 30 can output alternating current pulses through the first output node 31 and the second output node 32 according to the first target voltage and the second target voltage.

[0055] In one example, when the first target voltage is the same as the second target voltage, the current output unit 30 outputs alternating current pulses through the first output node 31 and the second output node 32 according to the first target voltage and the second target voltage, and the alternating current pulses have the same intensity.

[0056] In another example, when the first target voltage and the second target voltage are different, the current output unit 30 outputs alternating current pulses through the first output node 31 and the second output node 32 according to the first target voltage and the second target voltage. The intensity of these alternating current pulses is different. Here, the intensity of the current pulse is positively correlated with the magnitude of the target voltage.

[0057] For example, if the first target voltage is in the range of 5V to 10V and the second target voltage is in the range of 25V to 39V, the current output unit 30 outputs alternating current pulses through the first output node 31 and the second output node 32 based on the first and second target voltages. These alternating current pulses are a pair of pulses, one weak and one strong. Specifically, the current pulse corresponding to the first target voltage may have a weaker intensity, while the current pulse corresponding to the second target voltage may have a stronger intensity.

[0058] For example, both the first voltage control signal and the second voltage control signal output by the control unit 10 can be PWM signals. For instance, the first voltage control signal can be a first DC signal, and the second voltage control signal can be a second DC signal. Alternatively, the first voltage control signal can be a first PWM voltage regulation signal, and the second voltage control signal can be a second PWM voltage regulation signal.

[0059] As an example, when the first PWM voltage regulation signal and the second PWM voltage regulation signal are the same, the first target voltage and the second target voltage are the same. At this time, the current output unit 30 can output alternating current pulses through the first output node 31 and the second output node 32 according to the first target voltage and the second target voltage, and the upper and lower waveforms of these current pulses are symmetrical. Here, "the first PWM voltage regulation signal and the second PWM voltage regulation signal are the same" means that the first PWM voltage regulation signal and the second PWM voltage regulation signal are the same in both duty cycle and frequency. In this way, the first voltage conversion unit 21 outputs the first target voltage to the current output unit 30 according to the first PWM voltage regulation signal, which is the same as / equal to the second target voltage output by the second voltage conversion unit 22 to the current output unit 30 according to the second PWM voltage regulation signal.

[0060] As another example, when the first PWM voltage regulation signal and the second PWM voltage regulation signal are different, the first target voltage and the second target voltage are different. In this case, the current output unit 30 outputs alternating current pulses through the first output node 31 and the second output node 32 based on the first target voltage and the second target voltage, and the upper and lower waveforms of these current pulses are asymmetrical. Here, the difference between the first PWM voltage regulation signal and the second PWM voltage regulation signal refers to a difference in duty cycle and / or frequency between them. As a result, the first voltage conversion unit 21 outputs the first target voltage to the current output unit 30 based on the first PWM voltage regulation signal, which is different from / not equal to the second target voltage output by the second voltage conversion unit 22 based on the second PWM voltage regulation signal.

[0061] Therefore, in actual implementation, when the voltage control signal includes a first PWM voltage regulation signal and a second PWM voltage regulation signal, the first target voltage and the second target voltage can be the same or different by setting their duty cycle and / or frequency.

[0062] It is easy to understand that, in practical implementation, the first voltage conversion unit 21 and the second voltage conversion unit 22 can be implemented using the same voltage conversion circuit, such as a DC-DC converter circuit, a boost circuit, or a buck circuit. It is also understandable that, in practical implementation, the corresponding voltage conversion circuit can be configured as the first voltage conversion unit 21 and the second voltage conversion unit 22 according to the power supply requirements of the pulse output circuit of the beauty device; that is, existing voltage conversion circuits can be used, so they will not be elaborated further here.

[0063] Combination Figures 1 to 3 As one embodiment, the current output unit 30 includes: a first bridge branch 301 and a second bridge branch 302. Specifically:

[0064] The first bridge branch 301 is connected to the control unit 10 and the first voltage conversion unit 21 respectively. The first bridge branch 301 is used to generate a first current pulse according to the PWM signal and the first target voltage when the first contact electrode 110 and the second contact electrode 120 are in contact with the skin, and to apply the first current pulse to the skin through the first contact electrode 110.

[0065] The second bridge branch 302 is connected to the control unit 10 and the second voltage conversion unit 22 respectively. The second bridge branch 302 is used to generate a second current pulse according to the PWM signal and the second target voltage when the first contact electrode 110 and the second contact electrode 120 are in contact with the skin, and to apply the second current pulse to the skin through the second contact electrode 120.

[0066] In this embodiment, when the first contact electrode 110 and the second contact electrode 120 are in contact with the skin, the first bridge branch 301 and the second bridge branch 302 can be alternately turned on with the loop node 33 under the action of the PWM signal pair. Based on this, during the alternating conduction process, the first bridge branch 301 can generate a first current pulse corresponding to the first target voltage and apply the first current pulse to the skin through the first contact electrode 110, and the second bridge branch 302 can generate a second current pulse corresponding to the second target voltage and apply the second current pulse to the skin through the second contact electrode 120.

[0067] As one embodiment, the PWM signal pair includes a first PWM signal and a second PWM signal. For example... Figure 3 As shown, the first bridge branch 301 is configured with a first output terminal (i.e., the first output node 31), a first voltage terminal 3011, a first controlled terminal 3012, a second controlled terminal 3013, and a first loop terminal 3014. The first output terminal serves as the first output node 31, the first voltage terminal 3011 is used to connect to the first voltage conversion unit 21, the first controlled terminal 3012 is used to input the first PWM signal, and the second output terminal (i.e., the second output node 32) and the second controlled terminal 3013 are used to input the second PWM signal.

[0068] The second bridge branch 302 is configured with a second output terminal (i.e., the second output node 32), a second voltage terminal 3021, a third controlled terminal 3022, a fourth controlled terminal 3023, and a second loop terminal 3024. The second output terminal serves as the second output node 32, the second voltage terminal 3021 is used to connect to the second voltage conversion unit 22, the third controlled terminal 3022 is used to input a second PWM signal, and the fourth controlled terminal 3023 is used to input a first PWM signal. The node formed by connecting the first loop terminal 3014 and the second loop terminal 3024 serves as the loop node 33.

[0069] In this embodiment, the first bridge branch 301 and the second bridge branch 302 can be circuits with identical structures and symmetrical about the central axis of the loop node 33. That is, the first bridge branch 301 and the second bridge branch 302 form an H-bridge circuit.

[0070] In practical implementation, both the first bridge branch 301 and the second bridge branch 302 can be switching paths composed of electronic switches or switching transistors. The PWM signal pair includes a first PWM signal and a second PWM signal, and the first PWM signal and the second PWM signal are a staggered signal pair or a frequency complementary signal pair. That is, at any given moment within a unit cycle, when the first PWM signal is high, the second PWM signal is low, and when the first PWM signal is low, the second PWM signal is high. In other words, at a certain moment, the first PWM signal and the second PWM signal are both opposite level signals.

[0071] Based on this, taking the first PWM signal and the second PWM signal as complementary signal pairs within a unit period as an example, the first PWM signal can be at a high level at the first moment within the unit period, and the second PWM signal can be at a high level at the second moment within the unit period.

[0072] For example, when both the first controlled terminal 3012 of the first bridge branch 301 and the fourth controlled terminal 3023 of the second bridge branch 302 are used to input the first PWM signal, it can be determined that the controlled frequencies of the first controlled terminal 3012 and the fourth controlled terminal 3023 are the same. When the first contact electrode 130 and the second contact electrode 120 contact the skin, under the action of the first PWM signal, at the first moment within a unit cycle, the first bridge branch 301 and the second bridge branch 302 can be connected through the first output node 31, the first contact electrode 110, the skin, the second contact electrode 120, and the second output node 32. Similarly, since the second controlled terminal 3013 of the first bridge branch 301 and the third controlled terminal 3022 of the second bridge branch 302 are both used to input the second PWM signal, that is, the controlled frequencies of the second controlled terminal 3013 and the third controlled terminal 3022 are the same, under the action of the second PWM signal, at the second moment within a unit cycle, the first bridge branch 301 and the second bridge branch 302 can be connected through the first output node 31, the first contact electrode 110, the skin, the second contact electrode 120, and the second output node 32.

[0073] In this embodiment, since there are two conducting circuits between the first bridge branch 301 and the second bridge branch 302 within a unit cycle, at least two current pulses can be applied to the skin within a unit cycle, thereby effectively increasing the density of current pulses and improving the overall utilization rate of the beauty device.

[0074] Figure 4 A specific circuit diagram of a boost circuit according to an embodiment of this application is shown. (In conjunction with...) Figures 3 to 4 Both the first voltage conversion unit 21 and the second voltage conversion unit 22 include a boost circuit 201.

[0075] The boost circuit 201 includes a boost chip U1, an inductor L, a diode D1, a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a first capacitor C1, and a second capacitor C2.

[0076] The input terminal IN of the boost chip U1 is connected to the first terminal of the first capacitor C1, forming the input node PIN. The input node PIN is used to connect to the preset power supply VBAT. The second terminal of the first capacitor C1 is grounded. The first terminal of the inductor L1 and the first terminal of the first resistor R1 are connected to the input node PIN. The second terminal of the first resistor R1 and the enable terminal EN of the boost chip U1 are connected to the first terminal of the second resistor R2. The second terminal of the second resistor R2 is grounded. The second terminal of the inductor L1 is connected to the anode of the diode D1. The cathode of the diode D1 is connected to the first terminal of the third resistor R3, forming the voltage output node POUT. The voltage output node POUT is used to output the target voltage. The second terminal of the third resistor R3 and the first terminal of the fourth resistor R4 are connected to the first terminal of the sixth resistor R6, forming the current feedback node PFB. The current feedback node PFB is used to connect to the feedback terminal FB of the boost chip U1. The second terminal of the sixth resistor R6 is grounded. The second terminal of the fourth resistor R4 and the first terminal of the fifth resistor R5 are connected to the first terminal of the second capacitor C2. The first terminal of the second capacitor C2 is grounded. The second terminal of the fifth resistor R5 is used to connect to the control unit 10.

[0077] exist Figure 4 In the example shown, the control unit 10 outputs a voltage control signal to the boost circuit 201. This voltage control signal can be a DC signal or a PWM voltage regulation signal. Here, when the voltage control signal is a DC signal, different target voltages can be corresponding to different DC signals with different voltages / currents. When the voltage control signal is a PWM voltage regulation signal, different target voltages can be corresponding to different PWM voltage regulation signals with different duty cycles and / or frequencies.

[0078] As an example, taking a PWM voltage regulation signal as the voltage control signal, the control unit 10 outputs a PWM voltage regulation signal to the boost circuit 201. Under the action of this PWM voltage regulation signal, the current of the feedback network of the boost circuit 201 can be affected. Specifically, it can affect the current at the current feedback node PFB, thereby making the target voltage output by the boost circuit 201 change according to the PWM voltage regulation signal. That is, the target voltage output by the boost circuit 201 becomes adjustable.

[0079] Based on this, the current output unit 30 can generate a variety of current pulses with different amplitudes and intensities according to the PWM signal and different target voltages. In other words, the amplitude and intensity of the current pulses can be adjusted to meet the user's needs for different stimulation intensities.

[0080] Figure 5 A schematic diagram of the pulse output circuit of a beauty device according to another embodiment of this application is shown. Figure 5 As shown, the pulse output circuit 100 also includes a detection unit 40. Specifically:

[0081] Combination Figure 1 and Figure 5 The detection unit 40 is coupled between the loop node 33 and ground. The detection unit 40 is used to sample the voltage of the loop node 33, and outputs a first electrical signal when the sampled voltage value is equal to or greater than a threshold. The first electrical signal is used to indicate that the first contact electrode 110 and the second contact electrode 120 are in contact with the skin.

[0082] In this embodiment, the control unit 10 is connected to the detection unit 40. The control unit 10 is configured to output a PWM signal pair to the current output unit and a voltage control signal to the voltage conversion unit 20 when it receives the first electrical signal.

[0083] like Figure 5 As shown, in one embodiment, a loop resistor 34 is coupled between the first output node 31 and the second output node 32.

[0084] The detection unit 40 is also used to output a second electrical signal when the sampled voltage value is less than a threshold; wherein the second electrical signal is used to indicate that the first contact electrode 110 and the second contact electrode 120 are not in contact with the skin.

[0085] In this embodiment, the resistance value of the loop resistor 34 is greater than the resistance value of the skin when the first contact electrode 110 and the second contact electrode 120 are in contact with the skin. It is understood that the first contact electrode 110 and the second contact electrode 120 can be connected to the loop node 33 through internal wiring, internal branches, or internal devices in the current output unit 30, respectively. When the first contact electrode 110 and the second contact electrode 120 are in contact with the skin, since the resistance value of the loop resistor 34 is greater than the resistance value of the skin, the loop resistor 34 is effectively short-circuited. At this time, the first output node 31 and the second output node 32 are connected through the first contact electrode 110, the skin, and the second contact electrode 120. The first contact electrode 110 and the second contact electrode 120 can be connected to the loop node 33 through internal wiring, internal branches, or internal devices in the current output unit 30, thereby forming a closed loop. Based on this, when the first contact electrode 110 and the second contact electrode 120 are in contact with the skin, the detection unit 40 can acquire a sampling voltage at loop node 33 that is equal to or greater than the threshold. When the first contact electrode 110 and the second contact electrode 120 are not in contact with the skin, the first output node 31 and the second output node 32 can discharge electrical energy through the loop resistor 34. For example, a current pulse can be converted into heat energy on the loop resistor 34, at which time almost no voltage can be detected on the loop node 33.

[0086] In this embodiment, when the first contact electrode 110 and the second contact electrode 120 are not in contact with the skin, the first output node 31 and the second output node 32 can discharge electrical energy through the loop resistor 34. Based on this, if the voltage value sampled by the detection unit 40 to the loop node 33 is less than the threshold, the detection unit 40 outputs a second electrical signal, which indicates that the first contact electrode and the second contact electrode are not in contact with the skin.

[0087] The above solution, by using the loop resistor 34 between the first output node 31 and the second output node 32 to discharge electrical energy when the first contact electrode 110 and the second contact electrode 120 are not in contact with the skin, can avoid the situation where the voltage of the first contact electrode 110 and the second contact electrode 120 is too high when they have not been in contact with the skin for a long time. At the same time, it can avoid causing strong irritation to the user's skin and prevent the user from mistakenly thinking that the beauty device is leaking electricity.

[0088] Figure 6 A schematic diagram of a specific structure of the detection unit in an embodiment of this application is shown. For example... Figure 6 As shown in the illustration, as an embodiment, in a specific implementation, the detection unit 40 can be implemented using existing sampling and comparison circuits. For example, the detection unit 40 may include a sampling branch 41 and a comparison branch 42. The sampling terminal 4101 of the sampling branch 41 is connected to the loop node 33, and the output terminal 4104 of the sampling branch 41 is connected to the comparison branch 42. The sampling branch 41 is used to sample the voltage of the loop node 33 and output the sampled voltage value. The comparison branch 42 is used to compare the sampled voltage value with a threshold and output a first electrical signal or a second electrical signal.

[0089] In this embodiment, sampling branch 41 can sample the voltage of loop node 33 and transmit the sampled voltage value to comparison branch 42 as an electrical signal. Comparison branch 42 can output a first electrical signal or a second electrical signal representing the comparison result by comparing the electrical signal with the voltage representing the threshold.

[0090] In a specific implementation, sampling branch 41 can be a sampling circuit including a sampling resistor, and comparison branch 42 can include a comparator. The sampling circuit can sample the voltage of loop node 33 and then input it to the input of the comparator. The comparator compares the sampled voltage with a threshold voltage, thereby achieving the comparison between the sampled voltage value and the threshold.

[0091] It is understandable that, in specific implementation, sampling branch 41 can also be implemented by voltage division of loop node 33 by other voltage sampling circuits. Correspondingly, comparison branch 42 can also be implemented by using other existing circuits with comparison functions, which will not be elaborated here.

[0092] Figure 7 This illustration shows a specific circuit diagram of the current output unit in the pulse output circuit of a beauty device according to an embodiment of this application. For example... Figure 7 As shown, in one embodiment, when the current output unit 30 is specifically an EMS output unit, the first bridge branch 301 includes: a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, a first switch Q1, and a second switch Q2.

[0093] Combination Figure 3 , Figure 4 and Figure 7 The first end of the sixth resistor R6 serves as the first controlled terminal 3012. The second end of the sixth resistor R6 and the first end of the seventh resistor R7 are connected together to the controlled terminal of the first switch Q1. The low potential terminal of the first switch Q1 is connected to the second end of the seventh resistor R7, forming a node that serves as the first voltage terminal 3011. The high potential terminal of the first switch Q1 serves as the first output node 31. The high potential terminal of the second switch Q2 is connected to the high potential terminal of the first switch Q1. The low potential terminal of the second switch Q2 serves as the first loop terminal 3014. The controlled terminal of the second switch Q2 is connected to the first end of the eighth resistor R8. The second end of the eighth resistor R8 serves as the second controlled terminal 3013.

[0094] exist Figure 5 In the circuit, the second bridge branch 302 includes: a ninth resistor R9, a tenth resistor R10, an eleventh resistor R11, a third switch Q3, and a fourth switch Q4. The first terminal of the ninth resistor R9 serves as the third controlled terminal 3022. The second terminal of the ninth resistor R9 and the first terminal of the tenth resistor R10 are connected to the controlled terminal of the third switch Q3. The low-potential terminal of the third switch Q3 is connected to the second terminal of the tenth resistor R10, forming a node that serves as the second voltage terminal 3021. The high-potential terminal of the third switch Q3 serves as the second output node 32. The high-potential terminal of the fourth switch Q4 is connected to the high-potential terminal of the third switch Q3. The low-potential terminal of the fourth switch Q4 serves as the second loop terminal 3024. The controlled terminal of the fourth switch Q4 is connected to the first terminal of the eleventh resistor R11. The second terminal of the eleventh resistor R11 serves as the fourth controlled terminal 3023.

[0095] For example, the PWM signal pair includes a first PWM signal and a second PWM signal, and the first PWM signal and the second PWM signal are a staggered signal pair or a frequency complementary signal pair. Taking the first PWM signal being high during a first time period within a unit period and low during a second time period within a unit period, and the second PWM signal being low during the first time period within a unit period and high during the second time period within a unit period as an example. Figure 7In the circuit shown, under the action of the first PWM signal, the first switch Q1 is turned on during the first time period and turned off during the second time period. When the first switch Q1 is turned on, if the first contact electrode 110 and the second contact electrode 120 are in contact with the skin, the EMS pulse can act on the skin through the first contact electrode 110 and be transmitted to the second output node 32 through the second contact electrode 120. At the same time, under the action of the first PWM signal, the fourth switch Q4 is turned on during the first time period, and the current transmitted to the second output node 32 can act on the loop node 33 through the turned-on fourth switch Q4. At this time, the detection unit 40 can sample the voltage of the loop node 33 and determine that the sampled voltage value is equal to or greater than the threshold, thereby outputting the first electrical signal. Similarly, under the action of the second PWM signal, the third switch Q3 is turned off during the first time period and turned on during the second time period. When the third switch Q3 is turned on, if the first contact electrode 110 and the second contact electrode 120 are in contact with the skin, the EMS pulse can act on the skin through the second contact electrode 120 and be transmitted to the first output node 31 through the first contact electrode 110. Simultaneously, under the action of the second PWM signal, the second switch Q2 is turned on during the second time period, and the current transmitted to the first output node 31 acts on the loop node 33 through the turned-on second switch Q2. At this time, the detection unit 40 can sample the voltage of the loop node 33 and determine that the sampled voltage value is equal to or greater than a threshold, thereby outputting a first electrical signal.

[0096] Combination Figure 3 , Figure 4 and Figure 7 It is easy to understand that, under the action of the first PWM signal and the second PWM signal, when the first contact electrode 110 and the second contact electrode 120 are in contact with the skin, the detection unit 40 can sample the voltage of the loop node 33 within a unit cycle and determine that the sampled voltage value is equal to or greater than a threshold, thereby outputting a first electrical signal. When the first contact electrode 110 and the second contact electrode 120 are not in contact with the skin, the voltage value obtained by the detection unit 40 from sampling the voltage of the loop node 33 is less than the threshold, thereby outputting a second electrical signal.

[0097] Figure 8 A schematic diagram of the structure of a beauty device provided in an embodiment of this application is shown. Figure 8 As shown, the beauty device 200 includes the pulse output circuit 100 of the beauty device provided in any embodiment of this application.

[0098] Understandably, in Figure 8 In the embodiments shown, due to the improvements and specific implementation methods related to this application, [the following has been implemented]. Figures 1 to 7 The corresponding embodiments are described in detail, so they will not be repeated here.

[0099] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the above-described division of functional units and modules is merely an example. In practical applications, the above functions can be assigned to different functional units and modules as needed, that is, the internal structure of the device can be divided into different functional units or modules to complete all or part of the functions described above. The functional units and modules in the embodiments can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit.

[0100] The above-described embodiments are only used to illustrate the technical solutions of this application, and are not intended 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 of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application, and should all be included within the protection scope of this application.

Claims

1. A pulse output circuit for a beauty device, characterized in that, The beauty device is equipped with a first contact electrode and a second contact electrode spaced apart, and the pulse output circuit includes: The control unit is used to output PWM signals and voltage control signals. A voltage conversion unit, connected to the control unit, is used to output a target voltage according to the voltage control signal; A current output unit is connected to the control unit and the voltage conversion unit respectively. The current output unit is configured with a first output node and a second output node. The first output node is used to connect to the first contact electrode, and the second output node is used to connect to the second contact electrode. The current output unit is used to generate a current pulse based on the target voltage according to the PWM signal when the first contact electrode and the second contact electrode are in contact with the skin, and to apply the current pulse to the skin through the first contact electrode and the second contact electrode.

2. The pulse output circuit as described in claim 1, characterized in that, The current output unit is also configured with a loop node for coupling to ground.

3. The pulse output circuit as described in claim 2, characterized in that, The voltage conversion unit includes: A first voltage conversion unit is connected to the control unit and the current output unit respectively. The first voltage conversion unit is used to output a first target voltage to the current output unit according to the first voltage control signal output by the control unit. The second voltage conversion unit is connected to the control unit and the current output unit respectively. The second voltage conversion unit is used to output a second target voltage to the current output unit according to the second voltage control signal output by the control unit. The first target voltage may be the same as or different from the second target voltage.

4. The pulse output circuit as described in claim 3, characterized in that, The current output unit includes: The first bridge branch is connected to the control unit and the first voltage conversion unit respectively. The first bridge branch is used to generate a first current pulse to the first target voltage according to the PWM signal when the first contact electrode and the second contact electrode contact the skin, and apply the first current pulse to the skin through the first contact electrode. The second bridge branch is connected to the control unit and the second voltage conversion unit respectively. The second bridge branch is used to generate a second current pulse based on the PWM signal and the second target voltage when the first contact electrode and the second contact electrode are in contact with the skin, and to apply the second current pulse to the skin through the second contact electrode.

5. The pulse output circuit as described in claim 4, characterized in that, The PWM signal pair includes a first PWM signal and a second PWM signal; The first bridge branch is configured with a first output terminal, a first voltage terminal, a first controlled terminal, a second controlled terminal, and a first loop terminal. The first output terminal serves as the first output node, the first voltage terminal is used to connect to the first voltage conversion unit, the first controlled terminal is used to input the first PWM signal, and the second controlled terminal is used to input the second PWM signal. The second bridge branch is configured with a second output terminal, a second voltage terminal, a third controlled terminal, a fourth controlled terminal, and a second loop terminal. The second output terminal serves as the second output node, the second voltage terminal is used to connect to the second voltage conversion unit, the third controlled terminal is used to input the second PWM signal, and the fourth controlled terminal is used to input the first PWM signal. The node formed by connecting the first loop end and the second loop end is called the loop node.

6. The pulse output circuit as described in claim 3, characterized in that, Both the first voltage conversion unit and the second voltage conversion unit include a boost circuit; The boost circuit includes a boost chip, an inductor, a diode, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a first capacitor, and a second capacitor; The input terminal of the boost chip is connected to the first terminal of the first capacitor to form an input node. The input node is used to connect to a preset power supply. The second terminal of the first capacitor is grounded. The first terminal of the inductor and the first terminal of the first resistor are connected to the input node. The second terminal of the first resistor and the enable terminal of the boost chip are connected to the first terminal of the second resistor. The second terminal of the second resistor is grounded. The second terminal of the inductor is connected to the anode of the diode. The cathode of the diode is connected to the first terminal of the third resistor to form a voltage output node. The voltage output node is used to output the target voltage. The second terminal of the third resistor and the first terminal of the fourth resistor are connected to the first terminal of the sixth resistor to form a current feedback node. The current feedback node is used to connect to the feedback terminal of the boost chip. The second terminal of the sixth resistor is grounded. The second terminal of the fourth resistor and the first terminal of the fifth resistor are connected to the first terminal of the second capacitor. The first terminal of the second capacitor is grounded. The second terminal of the fifth resistor is used to connect to the control unit.

7. The pulse output circuit as described in claim 4, characterized in that, The first bridge branch and the second bridge branch together form an H-bridge circuit.

8. The pulse output circuit as described in claim 2, characterized in that, The pulse output circuit also includes: The detection unit is coupled between the loop node and ground. The detection unit is used to sample the voltage of the loop node and output a first electrical signal when the sampled voltage value is equal to or greater than a threshold. The first electrical signal is used to indicate that the first contact electrode and the second contact electrode are in contact with the skin. The control unit is connected to the detection unit and is configured to output the PWM signal pair to the current output unit and output a voltage control signal to the voltage conversion unit when the first electrical signal is received.

9. The pulse output circuit as described in claim 8, characterized in that, There is a loop resistor coupling between the first output node and the second output node; The detection unit is further configured to output a second electrical signal when the sampled voltage value is less than the threshold; wherein the second electrical signal is used to indicate that the first contact electrode and the second contact electrode are not in contact with the skin.

10. A beauty device, characterized in that, Includes the pulse output circuit of the beauty device according to any one of claims 1 to 9.

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