Dual drive breast pump and method of controlling the same

Abstract

This disclosure provides a dual-drive breast pump and its control method, relating to the field of maternal and infant product technology. The dual-drive breast pump includes a main controller, a first drive module, and a second drive module. The first drive module is electrically connected to the main controller and is directly or indirectly connected to the negative pressure chamber of the breast pump body through an air path. The first drive module can generate an adjustable first negative pressure relative to the negative pressure chamber. The second drive module is electrically connected to the main controller and connected in series with the first drive module. The second drive module is directly or indirectly connected to the negative pressure chamber and can generate a second negative pressure. The first and second drive modules can be independently controlled, forming two first control closed loops. At least one of the first and second drive modules can achieve frequency tracking by adjusting the drive frequency. This disclosure, through the independent frequency tracking control of the first and second drive modules, can adjust the drive frequency in real time to match the resonant state of the piezoelectric pump.

Description

Technical Field

[0001] This manual relates to the field of maternal and infant products technology, and in particular to a dual-drive breast pump and its control method. Background Technology

[0002] In terms of related technologies, with the intelligent development of maternal and infant products, piezoelectric drive technology is increasingly widely used in the field of breast pumps. Existing technologies include piezoelectric pump frequency adaptive control, hybrid drive of piezoelectric pumps and diaphragm pumps, and portable breast pumps integrating multiple piezoelectric pumps, providing diversified technical paths to improve the portability and working efficiency of breast pumps.

[0003] Existing technologies primarily employ single-piezoelectric pumps or multi-piezoelectric pump parallel architectures, achieving basic suction control by adjusting the drive voltage or frequency. While multi-piezoelectric pump designs can increase output power, they generally lack systematic solutions tailored to the individual differences of each piezoelectric pump, and the drive circuits often use uniform frequency control, failing to fully utilize the optimal performance of each pump. Furthermore, existing products largely rely on open-loop control for suction adjustment, making it difficult to guarantee pressure stability under different usage scenarios.

[0004] However, current technology has not effectively solved the problem of output consistency caused by individual differences in piezoelectric pumps. Especially in dual-pump or multi-pump systems, differences in flow and pressure characteristics can easily cause fluctuations in overall performance, affecting the standardized production and clinical application of the product. Summary of the Invention

[0005] This manual provides a dual-drive breast pump and its control method, which can solve the problems existing in related technologies.

[0006] The first aspect of this disclosure provides a dual-drive breast pump, including a main controller, a first drive module, and a second drive module; The first drive module is electrically connected to the main controller. The first drive module is directly or indirectly connected to the negative pressure chamber of the milk suction body through the air passage. The first drive module can generate an adjustable first negative pressure relative to the negative pressure chamber. The second drive module is electrically connected to the main controller and connected in series with the first drive module. The second drive module is directly or indirectly connected to the negative pressure chamber and can generate an adjustable second negative pressure relative to the negative pressure chamber. The first drive module and the second drive module can be controlled independently and form two first control closed loops. At least one of the first drive module and the second drive module can achieve frequency tracking by adjusting the drive frequency.

[0007] In the above structure, the main controller can serve as the core control unit of the dual-drive breast pump, specifically responsible for coordinating the working states of the first drive module and the second drive module.

[0008] The main controller can independently control the two drive modules and construct two independent first control loops. By receiving user input or sensor feedback, the main controller can dynamically adjust the output parameters of the drive modules to ensure that the pressure changes in the negative pressure chamber meet the preset requirements.

[0009] Because the main controller has the ability to adjust the drive frequency, it can provide control logic support for the frequency tracking function. By integrating the air pressure data fed back from the pressure detection module and the circuit parameters of the current acquisition unit, the main controller can optimize the frequency parameters of the two drive modules in real time, dynamically matching the resonant frequency of the corresponding piezoelectric pump, ensuring high energy conversion efficiency under different breast conditions, and improving milk expression efficiency and comfort.

[0010] According to some embodiments of this disclosure, the first drive module includes: The first inverter is electrically connected to the main controller; The first piezoelectric pump is electrically connected to the first inverter. The first piezoelectric pump is configured to be controlled by the main controller in conjunction with the first inverter. The first piezoelectric pump is connected to the gas circuit. The first current acquisition unit has its first terminal electrically connected to the main controller and its second terminal electrically connected to the first inverter. The first current acquisition unit can acquire the current parameters of the circuit where the first inverter is located and transmit the acquired current parameters to the main controller. The main controller, the first inverter, and the first current acquisition unit work together to form the first control closed loop.

[0011] The closed-loop control architecture of the first control loop can control the working state of the first piezoelectric pump by collecting circuit current parameters in real time and dynamically adjusting the output frequency of the first inverter. This effectively improves the suction stability and response speed of the breast pump, while reducing energy loss and noise caused by frequency mismatch and improving the user experience.

[0012] The components of the first drive module can cooperate to form a first control closed loop, thereby enabling control of the negative pressure chamber. Specifically, the first inverter is electrically connected to the main controller, converting the main controller's control signals into AC signals to drive the first piezoelectric pump. By adjusting the output frequency and voltage, precise control of the first piezoelectric pump's operating state is achieved, providing the hardware foundation for the frequency tracking function and enabling real-time response to the main controller's frequency tracking commands.

[0013] According to some embodiments of this disclosure, the second drive module includes: The second inverter is electrically connected to the main controller; The second piezoelectric pump is electrically connected to the second inverter. The second piezoelectric pump is configured to be controlled by the main controller in conjunction with the second inverter. The second piezoelectric pump is connected to the air circuit. The second piezoelectric pump and the first piezoelectric pump are connected in series. The second current acquisition unit has its second terminal electrically connected to the main controller and its second terminal electrically connected to the second inverter. The second current acquisition unit can acquire the current parameters of the circuit where the second inverter is located and transmit the acquired current parameters to the main controller. The main controller, the second inverter, and the second current acquisition unit work together to form the first control closed loop.

[0014] The aforementioned second drive module can form another first control closed loop. Specifically, it can acquire the current parameters of the circuit containing the second inverter in real time through the second current acquisition unit and quickly transmit these parameters to the main controller. After receiving these parameters, the main controller can precisely control the second inverter according to preset algorithms and logic, thereby adjusting the working state of the second piezoelectric pump. Since the second piezoelectric pump is connected in series with the first piezoelectric pump in the air circuit, this control method can realize the coordinated operation of the two piezoelectric pumps, precisely adjust the suction power according to actual needs, meet the usage needs of different users in different scenarios, and provide a strong guarantee for the efficient and stable operation of the breast pump.

[0015] The second drive module has similar functions to the first drive module, and the two work together to achieve relative frequency tracking.

[0016] According to some embodiments of this disclosure, a first piezoelectric pump is a main pump, a second piezoelectric pump is a slave pump, the air inlet of the main pump is connected to the negative pressure chamber of the dual-drive breast pump, the air outlet of the main pump is connected to the air inlet of the slave pump, and the air outlet of the slave pump is connected to the outside.

[0017] The series connection of the master and slave pumps described above provides a wider range of negative pressure adjustment during the operation of the dual-drive breast pump.

[0018] Specifically, the main pump can serve as a basic power source, maintaining a stable output of ±0.5% of the resonant frequency through its frequency tracking closed-loop control (main controller + first inverter + first current acquisition unit), drawing in outside air and generating a basic negative pressure to provide initial power for the subsequent milk pumping process.

[0019] The main pump's suction port is connected to the negative pressure chamber, allowing it to directly act on the breast to begin milk extraction. The negative pressure generated by the main pump is transmitted to the suction port of the slave pump through the exhaust port. The slave pump monitors the main pump's frequency changes in real time through a second control closed loop. Based on this, it dynamically adjusts its own drive frequency using a PID algorithm (response time ≤ 10ms) to achieve precise compensation and frequency tracking for the negative pressure.

[0020] According to some embodiments of this disclosure, the first piezoelectric pump is the master pump and the second piezoelectric pump is the slave pump; The main pump includes a first suction port, a first discharge port, a second suction port and a second discharge port. The first suction port is connected to the negative pressure chamber, the first suction port is connected to the first discharge port, the first discharge port is connected to the second suction port, the second suction port is connected to the second discharge port, and the second discharge port is connected to the slave pump. The pump includes a third suction port, a third discharge port, a fourth suction port, and a fourth discharge port. The third suction port is connected to the main pump, the third suction port is connected to the third discharge port, the third discharge port is connected to the fourth suction port, the fourth suction port is connected to the fourth discharge port, and the fourth discharge port is connected to the outside.

[0021] The more complex internal connection structure of the master-slave pump described above can be combined with frequency tracking control to further optimize the performance of the dual-drive breast pump.

[0022] According to some embodiments of this disclosure, the first current acquisition unit or the second current acquisition unit includes at least one of a Hall sensor, a current transformer, a shunt, a Rogowski coil, a fiber optic current sensor, or an integrated current sensor chip.

[0023] These different types of current acquisition units each have their own characteristics and advantages, and can meet the differentiated requirements of frequency tracking function for current parameter acquisition.

[0024] According to some embodiments of this disclosure, at least one of the first current acquisition unit or the second current acquisition unit is provided with a signal amplifier or filter.

[0025] The aforementioned signal amplifiers and filters improve the accuracy of frequency tracking in the current acquisition unit.

[0026] According to some embodiments of this disclosure, the dual-drive breast pump also includes: The voltage control module can provide an adjustable voltage. Its first terminal is electrically connected to the main controller, and its second terminal is electrically connected to both the first drive module and the second drive module. The pressure detection module has one end electrically connected to the main controller and the other end connected to the air circuit and capable of detecting the air pressure in the air circuit. The voltage control module and the pressure detection module can work together to control the power of the entire dual-drive breast pump and form a second control closed loop.

[0027] The second control loop enables precise control of the pump's suction levels and adaptability to multiple modes. Through the collaboration of the voltage control module and the pressure detection module, the second control loop allows for dynamic adjustment of the drive voltage, directly corresponding to different suction levels. The main controller determines the target negative pressure value based on the user-set suction level (such as stimulation mode or lactation mode), and combines this with the actual pressure feedback from the pressure detection module. A PID algorithm is then used to adjust the booster output voltage, ensuring a precise match between the drive voltage and the suction level requirements.

[0028] According to some embodiments of this disclosure, the voltage control module includes: The boost converter has its first end electrically connected to the main controller, and its second end electrically connected to both the first drive module and the second drive module. A low-voltage power supply is also electrically connected to the boost converter. The voltage acquisition unit has its first end electrically connected to the main controller, and its second end electrically connected to both the first drive module and the second drive module. The main controller, in conjunction with the voltage acquisition unit and the boost converter, can control the drive voltage of the first drive module and the second drive module.

[0029] In the above structure, the boost converter is a functional component of the voltage control module, whose function is to convert the input low voltage into a high voltage that meets the operating requirements of the dual-drive breast pump. In specific implementations, the boost converter can adopt an efficient and stable circuit design as needed, and can precisely adjust the output voltage according to the instructions of the main controller.

[0030] According to some embodiments of this disclosure, the voltage acquisition unit includes at least one of a voltage sensor, an analog-to-digital converter, a voltage divider resistor, an operational amplifier, an isolation amplifier, and an optocoupler isolation module.

[0031] These different types of voltage acquisition units each have their unique performance and applicable scenarios, which can meet the voltage acquisition requirements of dual-drive breast pumps under different working conditions, and effectively solve the problem of inconsistent pressure caused by the lack of a clear electrical drive frame for piezoelectric pumps and individual differences in the existing technology.

[0032] According to some embodiments of this disclosure, the pressure detection module includes: The pressure detection unit is connected to the air circuit and can detect the air pressure in the air circuit. The pressure acquisition unit is electrically connected to the pressure detection unit and connected to the main controller. The pressure acquisition unit can acquire the negative pressure signal of the pressure detection unit and transmit it to the main controller. The pressure detection unit and the pressure acquisition unit work together to monitor the current operating power of the dual-drive breast pump.

[0033] The pressure detection unit described above can directly sense changes in airway pressure. It can use high-precision piezoresistive or piezoelectric sensors with a range of -5kPa to -30kPa, and can capture pressure fluctuations in the airway in real time during milk pumping.

[0034] According to some embodiments of this disclosure, the pressure acquisition unit includes at least one of a pressure sensor, a negative pressure sensor, a differential pressure sensor, an absolute pressure sensor, and a pressure transmitter.

[0035] The aforementioned different types of pressure acquisition sensors have their own unique characteristics and applicable scenarios, which can meet the pressure acquisition needs of dual-drive breast pumps under different working conditions.

[0036] According to some embodiments of this disclosure, the pressure acquisition unit is provided with a signal amplifier or filter.

[0037] The aforementioned signal amplifier can amplify the weak pressure signal acquired by the pressure acquisition unit.

[0038] According to some embodiments of this disclosure, the main controller, voltage acquisition unit, booster, pressure detection unit, and pressure acquisition unit cooperate to form a second control closed loop.

[0039] The aforementioned second control closed loop uses the main controller as a processing unit to integrate real-time voltage data from the voltage acquisition unit and pressure information fed back from the pressure detection unit and pressure acquisition unit, thus constructing a dynamic adjustment mechanism. The main controller first receives the digital pressure signal transmitted by the pressure acquisition unit, and combines it with preset pressure parameters (such as -5kPa to -8kPa for stimulation mode and -12kPa to -18kPa for lactation mode), calculates the deviation between the current pressure and the target value using a PID algorithm, and outputs control commands to the booster accordingly.

[0040] According to some embodiments of this disclosure, the dual-drive breast pump also includes a pressure relief module. The first end of the pressure relief module is electrically connected to the main controller, and the second end of the pressure relief module is connected to the air path where the negative pressure chamber is located. The pressure relief module can relieve pressure on the air path.

[0041] The aforementioned pressure relief module can relieve pressure on the dual-drive breast pump.

[0042] According to some embodiments of this disclosure, the pressure relief module includes: Pressure relief valve, connected to the air circuit; The drive unit is electrically connected to the pressure relief valve and also electrically connected to the main controller; The main controller can control the drive unit to open and close the pressure relief valve.

[0043] The aforementioned pressure relief valve is an opening and closing component directly connected to the gas circuit. Gas release can be achieved by opening the pressure relief valve. The valve body can be made of high-strength, corrosion-resistant materials to ensure that it can withstand the pressure and corrosiveness of the gas in the gas circuit during long-term use, guaranteeing normal opening and closing.

[0044] According to some embodiments of this disclosure, the dual-drive breast pump also includes a control module electrically connected to the main controller, and the control module is capable of adjusting the speed of the dual-drive breast pump.

[0045] The aforementioned control module provides users with a convenient and personalized control method during the use of the dual-drive breast pump. Electrically connected to the main controller, the control module accurately transmits user-inputted speed adjustment commands to the main controller. Users can flexibly adjust the speed of the dual-drive breast pump using the control module according to their own pumping needs, comfort levels, and different pumping stages.

[0046] According to some embodiments of this disclosure, the dual-drive breast pump also includes a display module, which is electrically connected to the main controller and can display the real-time parameters of the dual-drive breast pump.

[0047] The aforementioned display module can display key parameter information of the device to users in real time and intuitively, allowing users to understand the device's working status at any time. Through electrical connection with the main controller, the display module can accurately acquire various data processed by the main controller and present them to the user in a clear and easy-to-understand manner.

[0048] Secondly, this disclosure also provides a control method for a dual-drive breast pump, applied to the aforementioned dual-drive breast pump, the control method comprising the following steps: When the dual-drive breast pump is started, the main controller provides initial control signals to the first and second inverters respectively, and controls the boost converter to output the initial voltage. The first and second piezoelectric pumps, which are connected in series, are started to work. The air inlet of the first piezoelectric pump is connected to the negative pressure chamber of the dual-drive breast pump, and the air outlet of the first piezoelectric pump is connected to the air inlet of the second piezoelectric pump. The main controller detects the drive current of the first piezoelectric pump in real time through the first current acquisition unit, and provides a control channel for the first inverter to independently adjust the output frequency based on the detected current value. The main controller detects the drive current of the second piezoelectric pump in real time through the second current acquisition unit, and provides a control channel for the second inverter to independently adjust the output frequency based on the detected current value. The driving frequencies of the first piezoelectric pump and the second piezoelectric pump are individually adaptively controlled so that the driving frequencies of the first piezoelectric pump and the second piezoelectric pump are both within the preset resonant frequency range.

[0049] In the above steps, after starting the dual-drive breast pump, the main controller can provide the inverter with the initial control signal and control the initial voltage output of the boost converter. It will also continuously monitor the overall operating status of the dual-drive breast pump.

[0050] According to some embodiments of this disclosure, the control method further includes the following steps: The main controller determines the target negative pressure value based on the suction level set by the user, and obtains the actual pressure value of the negative pressure chamber in real time through the pressure acquisition unit; The main controller compares the actual pressure value with the target negative pressure value and adjusts the output voltage of the booster through PID or other control algorithms, thereby controlling the drive voltage applied to the first piezoelectric pump and the second piezoelectric pump. When the actual pressure is lower than the target pressure, increase the output voltage of the booster to increase the pump's pumping capacity; When the actual pressure is higher than the target pressure, the output voltage of the booster is reduced to decrease the pump's pumping capacity, so that the actual pressure is stabilized within the allowable error range of the target pressure value.

[0051] In actual use of the dual-drive breast pump, the above control method allows users to set a suitable suction level based on their own comfort and pumping needs. Upon receiving the user-set suction level, the main controller quickly determines the corresponding target negative pressure value. This target negative pressure value is a crucial basis for subsequent adjustments by the main controller, reflecting the pumping force the user expects the dual-drive breast pump to achieve. Attached Figure Description

[0052] To more clearly illustrate the technical solutions in the embodiments of this specification, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this specification. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0053] Figure 1 A schematic diagram of a dual-drive breast pump according to an embodiment of the present disclosure is shown; Figure 2 Another structural schematic diagram of a dual-drive breast pump provided according to an embodiment of the present disclosure is shown; Figure 3 A flowchart illustrating a frequency tracking control method for a dual-drive breast pump according to an embodiment of the present disclosure is shown. Figure 4 A further flowchart of a frequency tracking control method for a dual-drive breast pump provided according to an embodiment of the present disclosure is shown; Figure 5 A schematic flowchart of another frequency tracking control method for a dual-drive breast pump provided according to an embodiment of the present disclosure is shown; Figure 6 A schematic flowchart of another frequency tracking control method for a dual-drive breast pump provided according to an embodiment of the present disclosure is shown.

[0054] Figure label: 100. Main controller; 200. First drive module; 210. First inverter; 220. First piezoelectric pump; 230. First current acquisition unit; 300. Second drive module; 310. Second inverter; 320. Second piezoelectric pump; 330. Second current acquisition unit; 400. Voltage control module; 410. Boost converter; 420. Voltage acquisition unit; 430. Low-voltage power supply; 500. Pressure detection module; 510. Pressure detection unit; 520. Pressure acquisition unit; 600. Pressure relief module; 610. Pressure relief valve; 620. Drive unit; 700. Air path; 800. Negative pressure chamber. Detailed Implementation

[0055] The following description provides specific application scenarios and requirements for this specification, intended to enable those skilled in the art to make and use the contents of this specification. Various partial modifications to the disclosed embodiments will be apparent to those skilled in the art, and the general principles defined herein can be applied to other embodiments and applications without departing from the spirit and scope of this specification. Therefore, this specification is not limited to the embodiments shown, but rather to the widest scope consistent with the claims.

[0056] The terminology used herein is for the purpose of describing particular embodiments only and is not restrictive. For example, unless the context clearly indicates otherwise, the singular forms “a,” “an,” and “the” as used herein may also include the plural forms. When used in this specification, the terms “comprising,” “including,” and / or “containing” mean that the associated feature, integer, step, operation, element, and / or component is present, but do not preclude the presence of one or more other features, integers, steps, operations, elements, components, and / or groups, or that other features, integers, steps, operations, elements, components, and / or groups may be added to the system / method.

[0057] Considering the following description, these and other features of this specification, as well as the operation and function of the related components of the structure, and the economy of assembly and manufacture of the parts, can be significantly improved. All of these form part of this specification with reference to the accompanying drawings. However, it should be clearly understood that the drawings are for illustrative and descriptive purposes only and are not intended to limit the scope of this specification. It should also be understood that the drawings are not drawn to scale.

[0058] The flowcharts used in this specification illustrate operations implemented according to some embodiments of this specification. It should be clearly understood that the operations in the flowcharts may not be implemented in a sequential order. Instead, the operations may be implemented in reverse order or simultaneously. Furthermore, one or more additional operations may be added to the flowcharts. One or more operations may be removed from the flowcharts.

[0059] In this specification, "X includes at least one of A, B, or C" means that X includes at least A, or X includes at least B, or X includes at least C. That is, X can include only one of A, B, and C, or any combination of A, B, and C, as well as other possible content / elements. Any combination of A, B, and C can be A, B, C, AB, AC, BC, or ABC.

[0060] In this specification, unless explicitly stated otherwise, the relationships between structures can be direct or indirect, complete or partial. For example, when describing "A is connected to B," unless explicitly stated that A and B are directly connected, it should be understood that A can be directly connected to B or indirectly connected to B. Similarly, when describing "A is above B," unless explicitly stated that A is directly above B (AB is adjacent and A is above B), it should be understood that A can be directly above B or indirectly above B (AB is separated by other elements, and A is above B). Furthermore, when describing "A is inside B," unless explicitly stated that A is entirely inside B, it should be understood that A can be entirely inside B or partially inside B. And so on.

[0061] This disclosed dual-drive breast pump is a device in the field of maternal and infant care, specifically designed for breastfeeding mothers. It uses a dual-power system to simulate a baby's natural sucking pattern, achieving a highly efficient and comfortable breastfeeding experience. The device integrates intelligent negative pressure adjustment technology, automatically adjusting suction parameters according to the user's breast condition, while also featuring quiet operation, balancing breastfeeding efficiency and user comfort.

[0062] This disclosed dual-drive breast pump is an innovative device in the field of maternal and infant care, designed specifically for breastfeeding mothers. It utilizes a dual-pump collaborative drive system to simulate the negative pressure waveform of a baby's natural sucking, achieving an efficient and comfortable breastfeeding experience. The device integrates pressure-voltage-frequency triple closed-loop control technology, dynamically adapting suction parameters according to the user's breast condition. Simultaneously, it optimizes operating noise through a frequency tracking algorithm, balancing breastfeeding efficiency with user comfort.

[0063] When mothers are pumping breast milk at home or at work, dual-drive breast pumps can be used to achieve timed and measured milk expression. These devices need to have multi-mode adjustment functions, including seamless switching between stimulation, lactation, and massage modes to adapt to the needs of different breastfeeding stages. For professional-grade breast pumps, negative pressure stability, suction adjustment precision, battery life, and ease of cleaning are core factors affecting user experience. Existing single-drive breast pumps generally suffer from large suction fluctuations and low lactation efficiency, and prolonged use can easily lead to breast discomfort. Therefore, a new type of dual-drive breast pump is needed.

[0064] This disclosure provides a dual-drive breast pump. The dual-drive breast pump provided by this disclosure adopts a dual-pump collaborative working architecture. The main pump is responsible for providing basic negative pressure, while the auxiliary pump achieves dynamic pressure compensation. Combined with a food-grade liquid silicone breast shield, it ensures a perfect fit to the breast. The device has a built-in microprocessor control unit that can store personalized user parameters and supports Bluetooth data synchronization to mobile terminals.

[0065] This disclosure provides a dual-drive breast pump. The dual-drive breast pump provided by this disclosure adopts a dual-pump collaborative working architecture. The main pump is responsible for providing basic negative pressure, while the auxiliary pump achieves dynamic pressure compensation. Combined with a food-grade liquid silicone breast shield, it ensures a perfect fit to the breast. The device has a built-in microprocessor control unit, which constructs a second control closed loop through voltage and pressure acquisition units. It can store personalized user parameters, supports Bluetooth data synchronization to mobile terminals, and realizes visualization of suction curves and intelligent adjustment suggestions.

[0066] To facilitate the description of the dual-drive breast pump's structure, unless otherwise specified, this instruction manual describes its structure with the breast shield opening facing upwards when the breast pump is operating normally. The working end refers to the components that directly contact the breast, including the breast shield, the petal-shaped massage pad, and the connecting air passages. Furthermore, the definitions of front, back, left, and right orientations in this instruction manual are based on the user's normal holding perspective.

[0067] As an example, Figure 1 and Figure 2 A system architecture diagram (including air circuit connection diagram) of a dual-drive breast pump provided according to an embodiment of the present disclosure is shown.

[0068] Reference Figure 1 and Figure 2 This disclosure provides a dual-drive breast pump, including a main controller 100, a first drive module 200, and a second drive module 300. In the above structure, the main controller 100 can serve as the core control unit of the dual-drive breast pump, specifically responsible for coordinating the working states of the first drive module 200 and the second drive module 300.

[0069] The main controller 100 can independently control the two drive modules and construct two independent first control closed loops. By receiving user input (such as suction adjustment commands) or sensor feedback (such as pressure signals from the negative pressure chamber 800), the main controller 100 can dynamically adjust the output parameters of the drive modules (such as negative pressure magnitude and drive frequency) to ensure that the pressure changes in the negative pressure chamber 800 meet the preset requirements.

[0070] Because the main controller 100 has the ability to adjust the drive frequency, it can provide control logic support for the frequency tracking function. By integrating the pressure data of the air path 700 fed back by the pressure detection module 500 and the circuit parameters of the current acquisition unit, the main controller 100 can optimize the frequency parameters of the two drive modules in real time, dynamically match the resonant frequency of the corresponding piezoelectric pump, and ensure that high energy conversion efficiency is maintained in different breast conditions, thereby improving milk expression efficiency and comfort.

[0071] The first drive module 200 is electrically connected to the main controller 100. The first drive module 200 is directly or indirectly connected to the negative pressure chamber 800 of the milk suction body through the air passage 700. The first drive module 200 can generate an adjustable first negative pressure relative to the negative pressure chamber 800.

[0072] The aforementioned first drive module 200 communicates with the main controller 100 via electrical connection and is directly or indirectly connected to the negative pressure chamber 800 of the milk pump body, capable of generating an adjustable first negative pressure. The magnitude and drive frequency of the first negative pressure can be independently controlled based on the main controller 100. Specifically, the negative pressure parameters can be dynamically adjusted according to user needs (such as suction preference at different stages of milk pumping) or breast condition (such as changes in milk flow) through instructions from the main controller 100.

[0073] Furthermore, the aforementioned first drive module 200 is one of two first control closed loops. The first drive module 200 can feed back the circuit current parameters to the main controller 100 in real time through the first current acquisition unit 230, forming a closed loop control based on frequency regulation to ensure the stability of the negative voltage output.

[0074] The second drive module 300 is electrically connected to the main controller 100 and connected in series with the first drive module 200. The second drive module 300 is directly or indirectly connected to the negative pressure chamber 800. The second drive module 300 can generate an adjustable second negative pressure relative to the negative pressure chamber 800.

[0075] The second drive module 300 is electrically connected to the main controller 100 and connected in series with the first drive module 200. It is also directly or indirectly connected to the negative pressure chamber 800, which can generate an adjustable second negative pressure. The series connection allows the negative pressure outputs of the two drive modules to superimpose or cooperate within the negative pressure chamber 800. By adjusting the magnitude and phase relationship of the negative pressures, more complex negative pressure waveforms (such as pulsed or stepped negative pressures) can be achieved.

[0076] Similar to the first drive module 200, the second drive module 300 has independent control capability. It forms an independent closed-loop control with the second inverter 310 through the second current acquisition unit 330, and can independently respond to the instructions of the main controller 100 to adjust the negative voltage parameters and drive frequency.

[0077] The first drive module 200 and the second drive module 300 can be controlled independently and form two first control closed loops. At least one of the first drive module 200 and the second drive module 300 can achieve frequency tracking by adjusting the drive frequency.

[0078] The independent control of the first drive module 200 and the second drive module 300 can be coordinated to achieve complex negative pressure regulation. Specifically, the first drive module 200 and the second drive module 300 can each receive instructions from the main controller 100 and independently adjust the negative pressure magnitude, drive frequency, and operating timing to achieve frequency tracking functionality between the two drive modules. During the frequency tracking process of the first drive module 200 and the second drive module 300, the operating frequencies of the two drive modules can be synchronized as much as possible, avoiding mutual interference between the first drive module 200 and the second drive module 300.

[0079] Furthermore, through frequency tracking, the two drive modules can dynamically match the resonant frequency of their respective piezoelectric pumps, ensuring efficient energy conversion under different usage scenarios. For example, when changes in the user's breast condition lead to changes in milk flow, the main controller 100 can adjust the drive frequency in real time, ensuring the piezoelectric pump always operates at the optimal resonant point, improving milk extraction efficiency while reducing energy consumption. This dynamic frequency adjustment mechanism can also effectively reduce noise and vibration during device operation by optimizing the vibration waveform, providing users with a more comfortable experience.

[0080] Furthermore, the collaborative operation of the dual drive modules is achieved through an independent control closed loop constructed by the main controller 100. The first drive module 200 is responsible for the basic negative pressure output, and its output parameters are dynamically adjusted by the main controller 100 based on user initial settings or sensor feedback. The second drive module 300 achieves refined control of the negative pressure waveform by superimposing an adjustable second negative pressure. For example, in stimulation mode, the second drive module 300 can output high-frequency pulse negative pressure to simulate a baby's rapid sucking action; while in lactation mode, the two drive modules can collaboratively output stable negative pressure to ensure a continuous flow of milk. This multi-mode adaptability allows the device to meet the needs of different breastfeeding stages.

[0081] Furthermore, the independent driving of the first drive module 200 and the second drive module 300 can prevent the failure of a single module from causing the overall function to fail, thereby improving the reliability of the system.

[0082] The coordinated setup of two sets of first control closed loops (main controller 100 + inverter + current acquisition unit) ensures that the output of each module can be monitored and corrected in real time: the piezoelectric pump operating current parameters are obtained through the current acquisition unit, and the main controller 100 uses this to determine the resonant frequency deviation and adjust the inverter output frequency, forming a frequency-current closed-loop control. This structure provides hardware and control logic support for frequency tracking functionality. Each closed loop can independently achieve frequency tracking to maintain efficient operation, or the two closed loops can work together to achieve precise control of the negative voltage waveform, for example, by achieving composite negative voltage curve output through master-slave frequency synchronization.

[0083] The frequency tracking function disclosed herein refers to at least one drive module adjusting the drive frequency to track changes in the resonant frequency of the piezoelectric pump and pressure fluctuations in the negative pressure chamber in real time, thereby achieving dynamic optimization of the negative pressure output. The core mechanism is frequency adaptive adjustment based on current feedback.

[0084] Specific implementation methods include: Dynamic pressure-frequency dual closed-loop tracking: The pressure detection module 500 monitors the pressure of the air circuit 700 in real time, the current acquisition unit synchronously acquires the working current of the piezoelectric pump, and the main controller 100 determines the current resonant frequency by analyzing the current parameters. Combined with the pressure deviation value, the inverter adjusts the drive frequency to quickly compensate for the pressure deviation caused by changes in breast tissue or sealing fluctuations, maintain a stable negative pressure for milk suction, and improve the response speed compared to traditional open-loop control. Physiological adaptive frequency tracking: Based on the changes in breast tissue elasticity fed back by the pressure sensor and the comfort parameters input by the user, the main controller 100 changes the negative pressure pulse characteristics by adjusting the drive frequency, so that the negative pressure waveform matches the lactation rhythm of the individual breast, improves milk discharge efficiency, and reduces engorgement feedback. Dual-module collaborative frequency tracking: Employing a master-slave frequency control architecture, the first drive module 200 (master pump) maintains the fundamental resonant frequency through current feedback, while the second drive module 300 (slave pump) dynamically compensates for frequency changes based on the master pump's frequency and pressure. For example, in stimulation mode, the slave pump superimposes high-frequency pulses at a higher frequency than the master pump; in lactation mode, the dual pumps synchronously track the frequency to achieve a smooth transition of the negative pressure waveform; in the later stages of pumping, the slave pump lowers its frequency to gently empty the breast, avoiding overstimulation. The core advantage of the frequency tracking function lies in overcoming the limitations of traditional single-drive breast pumps, which have fixed negative pressure waveforms and poor adaptability. Through dynamic frequency optimization, it achieves "on-demand adjustment," shortening the average pumping time and improving user satisfaction.

[0085] Reference Figure 1 and Figure 2According to some embodiments of this disclosure, the first drive module 200 includes a first inverter 210, a first piezoelectric pump 220, and a first current acquisition unit 230. The main controller 100, the first inverter 210, and the first current acquisition unit 230 cooperate to form a first control closed loop. The closed-loop control architecture of the above-mentioned first control closed loop can control the working state of the first piezoelectric pump 220 by acquiring circuit current parameters in real time and dynamically adjusting the output frequency of the first inverter 210, effectively improving the suction stability and response speed of the breast pump, while reducing energy loss and noise caused by frequency mismatch, and improving the user experience.

[0086] Specifically, the first inverter 210 is electrically connected to the main controller 100; the first piezoelectric pump 220 is electrically connected to the first inverter 210, and the first piezoelectric pump 220 is configured to be controlled by the main controller 100 in conjunction with the first inverter 210, and the first piezoelectric pump 220 is connected to the air circuit 700; the first end of the first current acquisition unit 230 is electrically connected to the main controller 100, and the second end of the first current acquisition unit 230 is electrically connected to the first inverter 210, and the first current acquisition unit 230 can acquire the current parameters of the circuit where the first inverter 210 is located, and transmit the acquired current parameters to the main controller 100.

[0087] In the above structure, the components of the first drive module 200 can cooperate to form a first control closed loop, thereby enabling control of the negative pressure chamber 800. Specifically, the first inverter 210 is electrically connected to the main controller 100, converting the control signals from the main controller 100 into AC signals to drive the first piezoelectric pump 220. By adjusting the output frequency and voltage, precise control of the operating state of the first piezoelectric pump 220 is achieved, providing the hardware foundation for the frequency tracking function and enabling real-time response to the frequency tracking commands from the main controller 100.

[0088] The first piezoelectric pump 220 serves as the power element. It receives control signals through the first inverter 210, generates negative pressure, and connects to the air circuit 700, directly outputting adjustable negative pressure to provide suction to the negative pressure chamber 800. The piezoelectric drive characteristics of the first piezoelectric pump 220 ensure low noise and high response speed, enhancing the user experience.

[0089] The first current acquisition unit 230 acquires the current parameters (including current amplitude and phase) of the circuit where the first inverter 210 is located and transmits them to the main controller 100. By monitoring the change of the current resonance peak, it provides the main controller 100 with a real-time resonant frequency reference for the piezoelectric pump, ensuring the dynamic response accuracy of the frequency tracking function (e.g., frequency adjustment response time ≤ 10ms, or other parameters).

[0090] The first current acquisition unit 230 acquires the current parameters of the circuit where the first inverter 210 is located and transmits them to the main controller 100. By monitoring the change of the current resonance peak value, it provides the main controller 100 with a real-time resonant frequency reference for the piezoelectric pump, ensuring the dynamic response accuracy of the frequency tracking function.

[0091] The first control closed loop, composed of the main controller 100, the first inverter 210, and the first current acquisition unit 230, forms an independent frequency adaptive control loop. Based on the resonant frequency offset fed back by the current acquisition unit, the main controller 100 adjusts the inverter output frequency through a PID algorithm to ensure that the first piezoelectric pump 220 always operates within the allowable range of resonant frequency (e.g., ±0.5%), thus achieving frequency tracking relative to the second drive module 300.

[0092] The closed-loop control described above improves energy conversion efficiency compared to the open-loop system (e.g., by 15%-20%), while reducing heat generation (temperature reduction of 8-12℃) and noise (noise level ≤42dB) caused by frequency mismatch.

[0093] In home breast pumping scenarios, addressing the needs for stable suction, low noise, and long battery life, the First Drive Module 200 achieves precise suction adjustment through frequency tracking closed-loop control. The piezoelectric pump operates at its resonant point to ensure quiet operation, meeting the needs of nighttime use or when the baby is resting. For working mothers expressing breast milk, meeting the requirements of rapid milk production, ease of operation, and portability, the frequency tracking function optimizes frequency parameters in real time, shortening the pumping time per session and improving battery life within limited battery capacity. In medical-grade breast pumping scenarios, given the need for traceable pressure parameters and high device stability, the First Control Closed-Loop's log-based data recording supports the replication of suction solutions and effect evaluation in medical settings, making it particularly suitable for assisted lactation for mothers of premature infants or patients with breast problems.

[0094] The above structure can form a complete closed-loop control system through the coordinated action of the main controller 100, the first inverter 210 and the first current acquisition unit 230, bringing multi-dimensional technical advantages.

[0095] The piezoelectric pump can always operate in a resonant state through real-time feedback of current parameters and dynamic frequency adjustment, achieving precise control of the negative pressure waveform, adapting to multiple modes such as stimulation / lactation, and simulating the natural sucking rhythm of an infant.

[0096] The first current acquisition unit 230 can be used to form a millisecond-level feedback link with the main controller 100, which can quickly compensate for pressure deviations caused by changes in breast tissue or airway 700 sealing fluctuations. This improves the response speed compared to traditional open-loop control and ensures suction stability.

[0097] Based on resonant frequency tracking technology, energy loss in non-operating frequency bands can be reduced. At the same time, through temperature monitoring and adaptive frequency adjustment, the device can operate with low power consumption and extend its battery life.

[0098] The modular design simplifies the maintenance process, and the standardized interface supports flexible replacement of parts; the low-resistance air circuit 700 and one-way valve structure improve the negative pressure transmission efficiency and prevent milk backflow; the lightweight design enhances portability and meets the needs of multiple usage scenarios.

[0099] It can be further integrated with overcurrent and overtemperature dual protection mechanisms. Through current abnormality monitoring and temperature threshold control, it can automatically cut off dangerous outputs and trigger fault prompts to ensure the safety of mothers and babies.

[0100] Reference Figure 1 and Figure 2 According to some embodiments of this disclosure, the second drive module 300 includes a second inverter 310, a second piezoelectric pump 320, and a second current acquisition unit 330. The main controller 100, the second inverter 310, and the second current acquisition unit 330 cooperate to form a first control closed loop.

[0101] The aforementioned second drive module 300 can form another first control closed loop. Specifically, the second current acquisition unit 330 can acquire the current parameters of the circuit where the second inverter 310 is located in real time and quickly transmit these parameters to the main controller 100. After receiving these parameters, the main controller 100 can precisely control the second inverter 310 according to preset algorithms and logic, thereby adjusting the working state of the second piezoelectric pump 320. Since the second piezoelectric pump 320 and the first piezoelectric pump 220 are connected in series in the air circuit 700, this control method can realize the coordinated operation of the two piezoelectric pumps, accurately adjust the suction power according to actual needs, meet the usage needs of different users in different scenarios, and provide a strong guarantee for the efficient and stable operation of the breast pump.

[0102] The second drive module 300 has similar functions to the first drive module 200, and the two can achieve relative frequency tracking when used together.

[0103] The second inverter 310 is electrically connected to the main controller 100; the second piezoelectric pump 320 is electrically connected to the second inverter 310, and the second piezoelectric pump 320 is configured to be controlled by the main controller 100 in conjunction with the second inverter 310. The second piezoelectric pump 320 is connected to the air circuit 700, wherein the second piezoelectric pump 320 and the first piezoelectric pump 220 are connected in series; the second current acquisition unit 330 is electrically connected at its second end to the main controller 100 and at its second end to the second inverter 310. The second current acquisition unit 330 can acquire the current parameters of the circuit where the second inverter 310 is located and transmit the acquired current parameters to the main controller 100.

[0104] In the above structure, the second inverter 310 is electrically connected to the main controller 100, converting the control commands of the main controller 100 into AC signals to drive the second piezoelectric pump 320. By adjusting the output frequency and voltage, precise control of the operating state of the second piezoelectric pump 320 is achieved, providing hardware support for dynamic pressure compensation and frequency tracking functions. The second piezoelectric pump 320 is a power element. It receives control signals through the second inverter 310, generates negative pressure, and connects in series to the air circuit 700, working in conjunction with the first piezoelectric pump 220. The piezoelectric drive characteristics of the second piezoelectric pump 320 ensure low noise and high response speed, improving the user experience.

[0105] The second current acquisition unit 330 acquires the current parameters of the circuit where the second inverter 310 is located in real time and transmits them to the main controller 100. By monitoring the change of the current resonance peak value, it provides the main controller 100 with a real-time resonance frequency reference, ensuring the dynamic response accuracy of the frequency tracking function.

[0106] The first control closed loop, composed of the main controller 100, the second inverter 310, and the second current acquisition unit 330, forms an independent frequency adaptive control loop. Based on the resonant frequency offset fed back from the current acquisition unit, the main controller 100 adjusts the output frequency of the second inverter 310 using a PID algorithm, ensuring that the second piezoelectric pump 320 always operates within ±0.5% of the resonant frequency, thus realizing the core control logic for frequency tracking. This closed-loop control improves energy conversion efficiency by 15%-20% compared to an open-loop system, while reducing heat generation and noise caused by frequency mismatch. Independent of the closed-loop control of the first drive module 200, it can achieve collaborative frequency tracking between the two modules through master-slave frequency synchronization, meeting the differentiated negative pressure requirements at different stages of breastfeeding.

[0107] According to some embodiments of this disclosure, a first piezoelectric pump 220 is a main pump, and a second piezoelectric pump 320 is a slave pump. The suction port of the main pump is connected to the negative pressure chamber 800 of the dual-drive breast pump, the air outlet of the main pump is connected to the suction port of the slave pump, and the air outlet of the slave pump is connected to the outside.

[0108] The series connection of the master and slave pumps described above provides a wider range of negative pressure adjustment during the operation of the dual-drive breast pump.

[0109] Specifically, the main pump can serve as a basic power source, maintaining a stable output of ±0.5% of the resonant frequency through its frequency tracking closed-loop control (main controller 100 + first inverter 210 + first current acquisition unit 230), drawing in outside air and generating a basic negative pressure to provide initial power for the subsequent milk pumping process.

[0110] The main pump's suction port is connected to the negative pressure chamber 800, allowing it to directly act on the breast to begin milk extraction. The negative pressure generated by the main pump is transmitted to the suction port of the slave pump through the exhaust port. The slave pump monitors the main pump's frequency changes in real time through a second control closed loop. Based on this, it dynamically adjusts its own drive frequency (response time ≤10ms) using a PID algorithm, achieving precise compensation and frequency tracking for the negative pressure.

[0111] When increased suction is needed, the slave pump enhances negative pressure output by increasing its frequency; when the suction reaches a suitable level or needs to be reduced, the slave pump lowers its frequency and maintains a resonant state. This master-slave pump coordinated frequency tracking mode allows the dual-drive breast pump to flexibly adjust the negative pressure according to actual needs, meeting the breast pumping needs of different users in various scenarios.

[0112] For example, in stimulation mode, the master pump provides gentle negative pressure at a base frequency (e.g., 200Hz), while the slave pump superimposes pulsed negative pressure at a high frequency (300-500Hz) to simulate the natural sucking rhythm of an infant (frequency fluctuation range ±5Hz) and stimulate the mammary glands to secrete milk. In lactation mode, the master and slave pumps work together to provide stable and stronger negative pressure through frequency synchronization (error ≤0.5Hz), improving energy conversion efficiency by 25%-30% compared to a single pump.

[0113] In addition, the series structure combined with frequency tracking control effectively disperses the load pressure, avoiding performance degradation or damage to a single pump body due to long-term high-load operation, extending the service life of the equipment by more than 30%, while reducing noise (≤42dB) and heat generation (temperature reduction of 8-12℃) caused by frequency mismatch, and improving the overall stability and reliability of operation.

[0114] Reference Figure 1 and Figure 2 According to some embodiments of this disclosure, the first piezoelectric pump 220 is the master pump and the second piezoelectric pump 320 is the slave pump; The main pump includes a first suction port, a first discharge port, a second suction port and a second discharge port. The first suction port is connected to the negative pressure chamber 800, the first suction port is connected to the first discharge port, the first discharge port is connected to the second suction port, the second suction port is connected to the second discharge port, and the second discharge port is connected to the slave pump. The pump includes a third suction port, a third discharge port, a fourth suction port, and a fourth discharge port. The third suction port is connected to the main pump, the third suction port is connected to the third discharge port, the third discharge port is connected to the fourth suction port, the fourth suction port is connected to the fourth discharge port, and the fourth discharge port is connected to the outside.

[0115] The more complex internal connection structure of the master-slave pump described above can be combined with frequency tracking control to further optimize the performance of the dual-drive breast pump.

[0116] The main pump's first intake port is directly connected to the negative pressure chamber 800. Through its independent frequency tracking closed-loop (main controller 100 + first inverter 210 + first current acquisition unit 230), it maintains a stable output of ±0.5% of the resonant frequency, rapidly and effectively drawing in outside air to create the initial negative pressure environment for the entire milk pumping process. The first intake port is connected to the first outlet port, allowing the drawn-in air to flow smoothly within the main pump, initially forming negative pressure. The first outlet port is connected to the second intake port, enabling secondary air flow and further enhancing the negative pressure effect of the main pump. Simultaneously, the resonant frequency shift is monitored in real time by the current acquisition unit (response time ≤10ms).

[0117] The second air outlet connects to the slave pump, accurately transmitting the negative pressure generated by the main pump to the slave pump, providing a basis for the slave pump's frequency tracking adjustment. After receiving the negative pressure from the main pump, the slave pump's third air inlet monitors the main pump's frequency changes in real time through a second control closed loop. The connection between the third air inlet and the third air outlet, and between the third air outlet and the fourth air inlet, forms an internal air circulation, facilitating the slave pump's dynamic adjustment of the drive frequency (frequency adjustment range 100-500Hz) via a PID algorithm, achieving precise negative pressure compensation. The fourth air inlet connects to the fourth air outlet and discharges air, completing the circulation.

[0118] During actual breast pumping, in stimulation mode, the main pump generates a gentle negative pressure at a base frequency, while the slave pump uses high-frequency tracking to superimpose pulsed negative pressure, simulating the natural sucking rhythm of an infant. This, combined with internal airflow circulation, enhances the efficiency of mammary gland stimulation. In lactation mode, the main and slave pumps work in sync through frequency synchronization, increasing energy conversion efficiency by 25%-30% compared to a single pump. This structure, combined with frequency tracking control, not only increases the negative pressure adjustment range by 30%-50% and suction stability by 20%-30%, but also reduces the load on a single pump by distributing the load, extending the equipment's lifespan by over 30%. Simultaneously, it reduces noise and heat generated due to frequency mismatch, significantly improving overall operational stability and reliability.

[0119] According to some embodiments of this disclosure, the first current acquisition unit 230 or the second current acquisition unit 330 includes at least one of a Hall sensor, a current transformer, a shunt, a Rogowski coil, a fiber optic current sensor, or an integrated current sensor chip.

[0120] These different types of current acquisition units each have their own characteristics and advantages, and can meet the differentiated requirements of frequency tracking function for current parameter acquisition.

[0121] Specifically, the Hall sensor is based on the Hall effect principle and has advantages such as simple structure, small size and wide frequency response (10Hz-1MHz). It can quickly capture the current change corresponding to the resonant frequency of the piezoelectric pump with a response time of ≤10ms, providing real-time data support for frequency tracking control. It also has little impact on the circuit under test and is suitable for master-slave pump cooperative frequency tracking scenarios.

[0122] Current transformers utilize the principle of electromagnetic induction to proportionally transform large currents into smaller currents for measurement. They are suitable for high-current acquisition environments, effectively isolating the main circuit from the measurement circuit, ensuring the electrical safety of the frequency tracking system, and are especially suitable for the isolation requirements of medical-grade breast pumps.

[0123] Shunts measure current signals by converting them into voltage signals. They are characterized by low cost and good linearity (±0.1%), and have significant advantages in scenarios where cost is sensitive and frequency tracking accuracy is moderate (frequency adjustment error ≤±1Hz).

[0124] Rogowski coils have advantages such as wide measurement range, fast frequency response (bandwidth up to 1GHz), and easy installation. They can accurately capture transient changes in high-frequency pulse current and are particularly suitable for acquiring current parameters from pump high-frequency tracking (300-500Hz) under stimulation mode.

[0125] Fiber optic current sensors utilize the properties of light to measure current. They have strong anti-electromagnetic interference capabilities and good insulation performance, and can maintain measurement accuracy (frequency detection error ≤ ±0.5Hz) even in strong electromagnetic environments, ensuring the stability of frequency tracking control.

[0126] The integrated current sensor chip integrates multiple functions, is small in size and highly integrated, can directly output digital signals, reduces signal transmission loss, and is suitable for miniaturized breast pump designs. Its built-in temperature compensation function can further improve the environmental adaptability of frequency tracking control.

[0127] In practical applications, depending on the frequency tracking accuracy requirements of the dual-drive breast pump (e.g., medical grade requires a frequency error of ≤ ±0.5Hz, consumer grade ≤ ±1Hz), cost budget, and usage environment, a suitable current acquisition unit or combination can be selected to ensure accurate acquisition of the inverter circuit's current parameters (including amplitude and phase). This provides the main controller 100 with a reliable basis for resonant frequency judgment, thereby ensuring the dynamic response speed and adjustment accuracy of the frequency tracking function, improving the energy conversion efficiency of the breast pump, and enhancing the user experience.

[0128] Reference Figure 1 and Figure 2 According to some embodiments of this disclosure, at least one of the first current acquisition unit 230 or the second current acquisition unit 330 is provided with a signal amplifier or filter.

[0129] The aforementioned signal amplifiers and filters improve the accuracy of frequency tracking in the current acquisition unit.

[0130] A signal amplifier can precisely amplify the acquired weak current signal (especially the characteristic signal near the resonant frequency of the piezoelectric pump), ensuring that the signal amplitude meets the AD sampling requirements of the main controller 100 (typical amplification factor of 50-200 times), providing effective input for the frequency tracking algorithm. In a dual-drive breast pump, the resonant current signal of the piezoelectric pump may only be in the mA range, and without amplification, it is easily submerged by noise, causing the main controller 100 to be unable to accurately identify the resonant frequency point, thus affecting the frequency tracking accuracy. An amplification circuit built using a low-noise operational amplifier (such as OP07) can improve the signal-to-noise ratio to over 40dB, ensuring that the main controller 100 can stably capture the current resonant peak, providing a reliable basis for frequency adjustment.

[0131] The filter is specifically optimized for frequency tracking scenarios, employing a second-order Butterworth bandpass design (center frequency 100-500Hz, bandwidth ±50Hz) to precisely filter out grid interference (50Hz / 60Hz) and high-frequency noise (greater than 1kHz), while retaining key current characteristics near the piezoelectric pump's resonant frequency. In practical applications, the breast pump's operating environment contains noise sources such as motor interference and power fluctuations. Unfiltered current signals can lead to resonant frequency judgment errors (up to ±10Hz or more), causing frequency tracking response lag or incorrect adjustment. After filtering, the harmonic distortion of the current signal can be controlled within 1%, enabling the main controller 100 to accurately extract resonant frequency parameters in real time, ensuring a frequency tracking adjustment response time ≤10ms.

[0132] For example, in stimulation mode, the master and slave pumps need to achieve high-frequency pulse coordinated frequency tracking. At this time, the combination of signal amplifier and filter can control the current sampling error within ±2mA, ensuring that the master controller 100 can distinguish a frequency change of 0.5Hz and achieve accurate superposition of pulse negative pressure. In the frequency synchronization process of lactation mode, the filtered current signal makes the frequency synchronization error of the two pumps ≤0.5Hz, and the energy conversion efficiency is improved by 8%-12% compared with the unoptimized version. At the same time, the optimization of the signal conditioning circuit can reduce frequency tracking malfunctions caused by noise, reduce the ineffective power consumption of the piezoelectric pump, extend the equipment's battery life by 15%-20%, and reduce the heat generation problem caused by frequency mismatch.

[0133] Reference Figure 1 and Figure 2 According to some embodiments of this disclosure, the dual-drive breast pump further includes a voltage control module 400 and a pressure detection module 500. The voltage control module 400 and the pressure detection module 500 can work together to control the power of the entire dual-drive breast pump and form a second control closed loop.

[0134] The second control loop enables precise control of the pump's speed settings and multi-mode adaptation. Through the collaboration of the voltage control module 400 and the pressure detection module 500, the second control loop allows for dynamic adjustment of the drive voltage, directly corresponding to different suction levels. The main controller 100 determines the target negative pressure value based on the user-set speed setting (such as stimulation mode or lactation mode), and combines this with the actual pressure feedback from the pressure detection module 500. A PID algorithm is then used to adjust the output voltage of the booster 410, ensuring a precise match between the drive voltage and the required speed setting.

[0135] The multi-mode can include a stimulation mode and a lactation mode. The stimulation mode outputs a lower drive voltage (e.g., 5-10V) to generate a gentle negative pressure (-5kPa to -8kPa) to simulate the gentle sucking rhythm of an infant. The lactation mode can increase the drive voltage (e.g., 15-24V) to form a stable strong negative pressure (-12kPa to -18kPa) to efficiently express milk.

[0136] The driving voltage for the stimulation mode can be in the range of 5V-10V, and the corresponding mild negative pressure can be -5kPa to -8kPa; the driving voltage for the lactation mode can be increased to 15V-24V, and the strong negative pressure can be increased to -12kPa to -18kPa relative to the mild negative pressure.

[0137] Specifically, the voltage control module 400 can provide an adjustable voltage. The first end of the voltage control module 400 is electrically connected to the main controller 100, and the second end of the voltage control module 400 is electrically connected to both the first drive module 200 and the second drive module 300. The first end of the pressure detection module 500 is electrically connected to the main controller 100, and the second end of the pressure detection module 500 is connected to the air passage 700 and can detect the air pressure in the air passage 700.

[0138] The voltage control module 400 described above has the function of outputting an adjustable voltage. The first end of the voltage control module 400 is electrically connected to the main controller 100, and the second end of the voltage control module 400 is electrically connected to the first drive module 200 and the second drive module 300 at the same time, so as to realize the voltage supply and regulation of the two drive modules.

[0139] The first end of the pressure detection module 500 is electrically connected to the main controller 100, and the second end is connected to the air circuit 700 system. It can detect the air pressure value inside the air circuit 700 in real time and accurately, and transmit the detected air pressure signal to the main controller 100 to provide air pressure data support for the decision-making of the main controller 100.

[0140] The pressure closed-loop feedback of the second control loop mentioned above can improve the output consistency of the two drive modules.

[0141] To address output fluctuations caused by individual differences in piezoelectric pumps and temperature drift, the second control closed loop monitors the pressure in the air circuit 700 in real time through the pressure detection module 500 and dynamically adjusts the voltage output. When the actual pressure is lower than the target value, the drive voltage is increased to enhance the pump's pumping capacity. When the actual pressure is higher than the target value, reduce the voltage to avoid overvoltage damage.

[0142] The above mechanism controls the negative pressure output error of different breast pumps to within ±0.1kPa, solving the problem of inconsistent suction caused by pump differences under traditional open-loop control.

[0143] The aforementioned second control loop can also achieve energy efficiency optimization and extended range.

[0144] The voltage control module 400 can use PWM modulation technology to dynamically adjust the duty cycle of the boost converter 410 according to the gear requirements, thus avoiding unnecessary power consumption. When the output voltage is reduced to a lower setting (e.g., 5V), current consumption is reduced by 30%. By combining real-time adjustment of the pressure closed loop to avoid continuous full-power operation, the battery life is improved with a 2000mAh battery capacity, such as more than 2 hours of battery life (longer than the traditional solution).

[0145] In other examples, when the pressure detection module 500 detects that the pressure in the air path 700 exceeds a safety threshold (e.g., -30 kPa), the main controller 100 immediately cuts off the output of the booster 410 to prevent damage to breast tissue. Voltage regulation can employ a soft-start algorithm (slope 0.5 V / ms) to avoid user discomfort caused by sudden pressure changes and improve the comfort of the breast pumping process.

[0146] The second control closed loop works in conjunction with the independent frequency tracking function of the dual drive modules to achieve dual optimization of frequency adaptation and voltage closed loop: The master and slave pumps maintain the resonant frequency during frequency tracking to ensure energy conversion efficiency; the voltage control is dynamically adjusted according to the actual power demand after frequency tracking to avoid pressure fluctuations caused by frequency changes, thereby increasing the negative pressure regulation range of the dual-pump series system by 30%-50%.

[0147] Reference Figure 1 and Figure 2 According to some embodiments of this disclosure, the voltage control module 400 includes a boost converter 410 and a voltage acquisition unit 420. The main controller 100 can control the drive voltage of the first drive module 200 and the second drive module 300 in cooperation with the voltage acquisition unit 420 and the boost converter 410.

[0148] In the above structure, the booster 410 is a functional component of the voltage control module 400, and its function is to convert the input low voltage into a high voltage that meets the operating requirements of the dual-drive breast pump. In specific implementations, the booster 410 can adopt an efficient and stable circuit design as needed, and can accurately adjust the output voltage according to the instructions of the main controller 100.

[0149] For example, in stimulation mode, the booster 410 adjusts the input voltage to the range of 5-10V to meet the need for generating a gentle negative pressure; while in lactation mode, the booster 410 increases the voltage to 15-24V to form a stable strong negative pressure and efficiently discharge milk.

[0150] Specifically, the first end of the boost converter 410 is electrically connected to the main controller 100, and the second end of the boost converter 410 is simultaneously electrically connected to the first drive module 200 and the second drive module 300. A low-voltage power supply 430 is electrically connected to the boost converter 410. The first end of the voltage acquisition unit 420 is electrically connected to the main controller 100, and the second end of the voltage acquisition unit 420 is simultaneously electrically connected to the first drive module 200 and the second drive module 300.

[0151] The voltage acquisition unit 420 is responsible for monitoring the output voltage of the booster 410 in real time and feeding back the acquired voltage signal to the main controller 100. This configuration allows the main controller 100 to accurately grasp the actual situation of the current drive voltage, and thus dynamically adjust the output voltage of the booster 410 based on the pressure of the air path 700 fed back by the pressure detection module 500 and the user-set gear requirements, using a PID algorithm.

[0152] The accuracy and response speed of the voltage acquisition unit 420 directly affect the accuracy and stability of voltage control. Therefore, in practical applications, it is necessary to select a voltage acquisition unit 420 with high accuracy and fast response characteristics.

[0153] Through the coordinated operation of the booster 410 and the voltage acquisition unit 420, the main controller 100 can achieve precise control over the drive voltage of the first drive module 200 and the second drive module 300. This control method not only ensures that the dual-drive breast pump can generate the required negative pressure in different modes, but also avoids ineffective power consumption and improves energy conversion efficiency by dynamically adjusting the voltage.

[0154] Meanwhile, the precision of voltage control further improves the output consistency of the dual-drive breast pump, keeping the negative pressure output error between different breast pumps within a very small range, thus providing users with a more stable and reliable breast pumping experience.

[0155] According to some embodiments of this disclosure, the voltage acquisition unit 420 includes at least one of a voltage sensor, an analog-to-digital converter, a voltage divider resistor, an operational amplifier, an isolation amplifier, and an optocoupler isolation module.

[0156] Each of these different types of voltage acquisition units 420 has its unique performance and applicable scenarios, which can meet the voltage acquisition requirements of dual-drive breast pumps under different working conditions and effectively solve the problem of inconsistent pressure caused by the lack of a clear piezoelectric pump electrical drive frame and individual differences in the existing technology.

[0157] Voltage sensors are components that directly sense voltage changes and can convert voltage signals into measurable electrical signals. They have the characteristics of fast response speed (≤10μs) and high measurement accuracy (error ≤0.5%), providing basic voltage data acquisition capabilities for electric drive frames.

[0158] The analog-to-digital converter is responsible for converting analog voltage signals into digital signals so that the main controller 100 can process and analyze them. Its 16-bit resolution ensures that continuously changing voltage signals are accurately converted into discrete digital quantities, providing a data basis for solving individual differences in piezoelectric pumps.

[0159] Voltage divider resistors reduce high voltage to a suitable measurement range by utilizing the voltage division principle of resistors. They are simple in structure and low in cost, enabling the initial acquisition of drive voltage in basic range adjustment scenarios.

[0160] Operational amplifiers can amplify weak voltage signals (gain 50-200 times), improving signal strength and signal-to-noise ratio, ensuring that the main controller 100 can accurately identify voltage differences at different levels.

[0161] Isolation amplifiers are mainly used to achieve electrical isolation, prevent high-voltage side interference from being transmitted to low-voltage side measurement circuits, ensure the accuracy of voltage signals in environments with strong electromagnetic interference, and avoid range adjustment errors caused by interference.

[0162] Optical isolation modules also have electrical isolation functions. They use optical signals to transmit electrical signals to achieve complete input-output isolation and have strong anti-interference capabilities (common-mode rejection ratio >100dB). They play a key role in multi-level switching scenarios where high isolation performance is required.

[0163] In practical applications, the use of components in combination can effectively address the shortcomings of existing technologies: For example, by using a combination of "voltage sensor + analog-to-digital converter + isolation amplifier", the voltage sensor first acquires the voltage signal of the drive module, which is then converted into a digital quantity by the analog-to-digital converter. The electromagnetic interference is then eliminated by the isolation amplifier, so that the voltage acquisition error is controlled within ±0.1V. This provides accurate voltage data to the main controller 100, ensuring that the output pressure deviation of piezoelectric pumps with different individual differences is ≤±0.1kPa at the same speed.

[0164] In the scenario of adjusting the suction level, the voltage divider resistor and the operational amplifier work together to achieve wide-range voltage acquisition (3-30V), supporting accurate identification of 5-10V (stimulation mode) and 15-24V (lactation mode), making up for the deficiency of existing technologies that do not explain the suction level adjustment method.

[0165] This modular design allows the voltage acquisition unit 420 to be adapted to different cost budgets and usage environments, providing reliable voltage data support for the stable operation of the dual-drive breast pump.

[0166] Reference Figure 1 and Figure 2 According to some embodiments of this disclosure, the pressure detection module 500 includes a pressure detection unit 510 and a pressure acquisition unit 520. The cooperation of the pressure detection unit 510 and the pressure acquisition unit 520 enables the monitoring of the current operating power of the dual-drive breast pump.

[0167] The pressure detection unit 510 can directly sense pressure changes in the air path 700. It can use a high-precision piezoresistive or piezoelectric sensor with a range of -5kPa to -30kPa, and can capture pressure fluctuations in the air path 700 in real time during milk pumping.

[0168] These sensors feature short response time (≤5ms) and small temperature drift (≤0.01kPa / ℃), ensuring that measurement accuracy can be maintained under different ambient temperatures.

[0169] The pressure acquisition unit 520 processes the weak signal output by the sensor through a precision signal conditioning circuit, including 24-bit high-resolution analog-to-digital conversion, temperature compensation algorithm and digital filtering, and finally transmits the pressure data to the main controller 100 with a resolution of 0.01 kPa.

[0170] Specifically, the pressure detection unit 510 is connected to the air passage 700 and can detect the air pressure in the air passage 700; the pressure acquisition unit 520 is electrically connected to the pressure detection unit 510 and connected to the main controller 100. The pressure acquisition unit 520 can acquire the negative pressure signal of the pressure detection unit 510 and transmit it to the main controller 100.

[0171] The pressure detection unit 510 is directly connected to the air passage 700 and can sense changes in air pressure within the air passage 700 in real time. It can accurately detect minute fluctuations in air pressure within the air passage 700, acquiring relevant data promptly and accurately regardless of whether the pressure is positive or negative. This precise air pressure detection capability provides fundamental information for subsequent monitoring of the entire dual-drive breast pump's operating status. For example, during pumping, the air pressure within the air passage 700 constantly changes with the pumping action and pump operation; the pressure detection unit 510 can capture these changes in real time, reflecting the dynamic situation of the pumping process.

[0172] The pressure acquisition unit 520 can acquire the negative pressure signal detected by the pressure detection unit 510 and accurately transmit these signals to the main controller 100. During transmission, the pressure acquisition unit 520 can ensure the integrity and accuracy of the signal, avoiding signal distortion or loss. For example, the air pressure data acquired by the pressure detection unit 510 can be transmitted to the main controller 100 in a suitable electrical signal form, so that the main controller 100 can receive clear and reliable air pressure information.

[0173] By combining the pressure detection unit 510 and the pressure acquisition unit 520, a pressure closed-loop control system that is deeply integrated with gear adjustment and frequency tracking functions is constructed.

[0174] The pressure detection unit 510 uses a high-precision MEMS pressure sensor (measurement range -50kPa to 0kPa, accuracy ±0.2kPa) to monitor pressure fluctuations in the gas path 700 in real time and output analog signals. The pressure acquisition unit 520 converts the analog signals into digital signals through a 16-bit analog-to-digital converter (sampling rate 1kHz), and transmits them to the main controller 100 after low-pass filtering (cutoff frequency 10Hz) to form a pressure feedback link.

[0175] The main controller 100 combines preset pressure parameters (such as -5kPa to -8kPa for stimulation mode and -12kPa to -18kPa for lactation mode) and dynamically adjusts the output voltage of the booster 410 through a PID algorithm to achieve precise control of the pressure (steady-state error ≤ ±0.1kPa).

[0176] During the frequency tracking process, the pressure acquisition data provides a key basis for frequency adjustment: when the resonant frequency of the piezoelectric pump shifts due to load changes, the main controller 100 analyzes the pressure fluctuation period (±0.5Hz resolution) and voltage-frequency curve, and drives the frequency tracking algorithm to complete the frequency calibration within 10ms, ensuring that the best energy conversion efficiency is maintained at different levels (15%-20% higher than traditional open-loop control).

[0177] For example, when switching from stimulation mode to lactation mode, the pressure detection unit 510 identifies the pressure target change within 300ms, the main controller 100 synchronously adjusts the voltage to the 15-24V range, and triggers the frequency tracking module to rescan the resonant point, so that the frequency synchronization error of the dual pumps is controlled within ±0.5Hz, avoiding user discomfort caused by sudden pressure changes.

[0178] The aforementioned collaborative mechanism not only solves the problem of disconnect between pressure and frequency regulation in existing technologies, but also enables the breast pump to maintain negative pressure stability (fluctuation ≤ ±0.3kPa) and low power consumption (25% longer battery life) across the entire range of pressure and frequency parameters through pressure-frequency dual parameter feedback, providing users with a breast pumping experience that combines comfort and efficiency.

[0179] According to some embodiments of this disclosure, the pressure acquisition unit 520 includes at least one of a pressure sensor, a negative pressure sensor, a differential pressure sensor, an absolute pressure sensor, and a pressure transmitter.

[0180] The aforementioned different types of pressure acquisition sensors have their own unique characteristics and applicable scenarios, which can meet the pressure acquisition needs of dual-drive breast pumps under different working conditions.

[0181] A pressure sensor is a device that can sense pressure signals and convert them into measurable electrical signals. It has high sensitivity and a wide measurement range, and can quickly respond to changes in air pressure within the air path 700. In general pressure acquisition scenarios, it can accurately obtain pressure information from the air path 700, providing basic data for subsequent power monitoring.

[0182] The negative pressure sensor is specifically designed to measure pressure values ​​under negative pressure conditions. For devices like dual-drive breast pumps that require generating negative pressure to pump milk, the negative pressure sensor can accurately detect the negative pressure within the air path 700, ensuring that the magnitude and changes of negative pressure can be accurately monitored during the pumping process, thereby guaranteeing the pumping effect and the normal operation of the device.

[0183] Differential pressure sensors are sensors that measure the pressure difference between two different locations. In dual-drive breast pumps, they can be used to measure the pressure difference in different parts of the air path 700. By analyzing these differences, we can gain a deeper understanding of the gas flow and pressure distribution within the air path 700, which helps the main controller 100 to more accurately control the working status of the device.

[0184] Absolute pressure sensors measure absolute pressure relative to a vacuum environment. They can provide absolute values ​​of pressure within a 700° gas path and are unaffected by changes in external atmospheric pressure. They play an important role in situations where high pressure measurement accuracy is required and absolute pressure needs to be considered.

[0185] A pressure transmitter is a device that converts pressure signals into standard electrical signals for transmission and processing. It has advantages such as good stability and strong anti-interference ability. It can amplify and convert the collected pressure signals and output them to the main controller 100 in a unified electrical signal form, so that the main controller 100 can perform subsequent analysis and control.

[0186] In practical applications, appropriate pressure acquisition sensors or combinations of sensors can be selected based on factors such as the specific working requirements of the dual-drive breast pump, measurement accuracy requirements, and cost budget.

[0187] According to some embodiments of this disclosure, the pressure acquisition unit 520 is provided with a signal amplifier or filter.

[0188] The aforementioned signal amplifier can amplify the weak pressure signal acquired by the pressure acquisition unit 520. During the operation of the dual-drive breast pump, the pressure signal acquired by the pressure acquisition unit 520 may be relatively weak. Without amplification, the main controller 100 may not be able to accurately identify and process these signals. The signal amplifier can amplify the weak pressure signal by a certain ratio, making it a signal strength suitable for the main controller 100 to process, thereby improving the signal-to-noise ratio and ensuring that the main controller 100 can accurately acquire pressure information.

[0189] For example, when the pressure signal amplitude acquired by the pressure acquisition unit 520 is very small, only a few millivolts, the signal amplifier can amplify it to a few volts so that the main controller 100 can clearly identify and process it.

[0190] The filter is used to filter the acquired pressure signal, removing noise and interference components. In the working environment of a dual-drive breast pump, various electromagnetic interferences and mechanical vibrations may exist. These interferences can introduce noise into the signal acquired by the pressure acquisition unit 520, affecting the accuracy and stability of the signal. The filter can remove noise signals based on different frequency characteristics, retaining only the useful pressure signal.

[0191] For example, using a low-pass filter can remove high-frequency noise signals, making the pressure signal smoother and more stable, providing accurate pressure data to the main controller 100, thereby ensuring the stability and reliability of the dual-drive breast pump in gear adjustment and frequency tracking control. The combined use of signal amplifiers and filters can effectively improve the quality of the pressure signal acquired by the pressure acquisition unit 520, providing strong support for the precise control and efficient operation of the entire dual-drive breast pump.

[0192] Reference Figure 1 and Figure 2According to some embodiments of this disclosure, the main controller 100, voltage acquisition unit 420, booster 410, pressure detection unit 510 and pressure acquisition unit 520 cooperate to form a second control closed loop.

[0193] The aforementioned second control closed loop uses the main controller 100 as a processing unit to integrate real-time voltage data from the voltage acquisition unit 420 and pressure information fed back from the pressure detection unit 510 and pressure acquisition unit 520, thus constructing a dynamic adjustment mechanism. The main controller 100 first receives the digital pressure signal transmitted by the pressure acquisition unit 520, and combines it with preset pressure parameters (such as -5kPa to -8kPa for stimulation mode and -12kPa to -18kPa for lactation mode), calculates the deviation between the current pressure and the target value using a PID algorithm, and outputs control commands to the booster 410 accordingly.

[0194] The booster 410 adjusts the output voltage (such as 5-10V or 15-24V range) according to the command, directly changing the drive power of the piezoelectric pump to achieve precise adjustment of the suction level (steady-state error ≤ ±0.1kPa).

[0195] The voltage acquisition unit 420 monitors the output voltage of the boost converter 410 in real time, forming a voltage feedback link to ensure the accuracy and stability of voltage regulation and avoid abnormal suction caused by voltage fluctuations.

[0196] In the frequency tracking function, the pressure acquisition data provides a key basis for frequency adjustment: when the resonant frequency of the piezoelectric pump shifts due to load changes, the main controller 100 analyzes the pressure fluctuation period (±0.5Hz resolution) and voltage-frequency curve, and drives the frequency tracking algorithm to complete the frequency calibration within 10ms, so that the frequency synchronization error of the dual pumps is controlled within ±0.5Hz, maintaining the best energy conversion efficiency (15%-20% higher than traditional open-loop control).

[0197] For example, when switching between modes (such as from stimulation mode to lactation mode), the pressure detection unit 510 identifies changes in the target pressure within 300ms. The main controller 100 synchronously adjusts the voltage and triggers the frequency tracking module to rescan the resonant point, ensuring a smooth suction transition and avoiding user discomfort caused by sudden pressure changes. Furthermore, the second control closed loop provides an absolute pressure reference unaffected by atmospheric pressure through an absolute pressure sensor (accuracy ±0.1kPa), maintaining stable pressure at each mode even under varying altitudes. A differential pressure sensor (resolution 0.1kPa) monitors the pressure difference across the air path 700, analyzes the flow matching between the two pumps, and triggers frequency tracking calibration when the differential pressure fluctuation exceeds ±0.5kPa, further optimizing energy utilization efficiency. Through coordinated control of pressure, voltage, and frequency, this closed-loop system enables the dual-drive breast pump to achieve negative pressure stability (fluctuation ≤ ±0.3kPa), low power consumption (25% longer battery life), and rapid response (adjustment delay ≤ 50ms) across the entire range of modes, providing users with a breast pumping experience that combines comfort and efficiency.

[0198] According to some embodiments of this disclosure, the dual-drive breast pump also includes a pressure relief module 600. The first end of the pressure relief module 600 is electrically connected to the main controller 100, and the second end of the pressure relief module 600 is connected to the air passage 700 where the negative pressure chamber 800 is located. The pressure relief module 600 can relieve pressure on the air passage 700.

[0199] The aforementioned pressure relief module 600 can relieve pressure on the dual-drive breast pump.

[0200] During normal operation of the dual-drive breast pump, various factors may cause an abnormal increase in air pressure within the air passage 700, such as blockage during pumping or malfunction of the drive module. In such cases, the pressure within the air passage 700 will increase rapidly. If this excessive pressure is not released in time, it will not only damage the air passage 700 and related components, affecting the normal service life of the equipment, but may also cause injury to the user and lead to safety issues.

[0201] The pressure relief module 600, electrically connected to the main controller 100, can receive control signals from the main controller 100 in real time. The main controller 100 determines whether the current air pressure exceeds a preset safety threshold based on the air pressure information within the air passage 700 fed back by the pressure acquisition unit 520. When excessively high air pressure is detected, the main controller 100 immediately sends a command to the pressure relief module 600 to activate its pressure relief function. The second end of the pressure relief module 600 is connected to the air passage 700 where the negative pressure chamber 800 is located. When the pressure relief module 600 is activated, it can quickly discharge the high-pressure gas within the air passage 700, rapidly reducing the air pressure within the air passage 700 to a safe range, thereby avoiding various adverse consequences caused by excessively high air pressure.

[0202] For example, during prolonged and continuous use of a dual-drive breast pump, the air pressure within the air passage 700 may gradually increase. In this case, the pressure acquisition unit 520 will promptly transmit the air pressure information to the main controller 100. After analysis and judgment, if the main controller 100 detects that the air pressure is approaching a safe threshold, it will preemptively control the pressure relief module 600 to prepare. Once the air pressure exceeds the threshold, the pressure relief module 600 will immediately activate, rapidly releasing pressure to ensure the safety of the equipment and the user. Moreover, the pressure relief module 600 has a very fast response speed, completing the pressure relief operation in a very short time, ensuring that the air pressure within the air passage 700 remains in a safe and controllable state.

[0203] According to some embodiments of this disclosure, the pressure relief module 600 includes a pressure relief valve 610 and a drive unit 620. The pressure relief valve 610 is connected to the air passage 700. The drive unit 620 is electrically connected to the pressure relief valve 610 and to the main controller 100. The main controller 100 can control the drive unit 620 to open and close the pressure relief valve 610.

[0204] The aforementioned pressure relief valve 610 is an opening and closing component directly connected to the gas passage 700. Gas discharge can be achieved by opening the pressure relief valve 610. The valve of the pressure relief valve 610 can be made of high-strength, corrosion-resistant materials to ensure that it can withstand the pressure and corrosiveness of the gas in the gas passage 700 during long-term use, ensuring normal opening and closing.

[0205] When the air pressure in the air passage 700 exceeds the safety threshold, the pressure relief valve 610 can be opened quickly under the action of the drive unit 620 to quickly discharge the high-pressure gas in the air passage 700 and reduce the air pressure to a safe range.

[0206] For example, in special circumstances, such as severe blockage during breastfeeding, the pressure in the air passage 700 may rise sharply. The pressure relief valve 610 can respond promptly to prevent damage to the equipment or harm to the user due to excessive pressure. The opening and closing of the pressure relief valve 610 is precise and reliable, and it can accurately control the amount of gas discharged according to the instructions issued by the main controller 100, ensuring that the air pressure in the air passage 700 is always in a safe and controllable state.

[0207] The drive unit 620 can control the opening and closing of the pressure relief valve 610. The drive unit 620 is electrically connected to the pressure relief valve 610 and also electrically connected to the main controller 100.

[0208] The drive unit 620 can receive control signals from the main controller 100 and precisely control the pressure relief valve 610 according to the signal instructions. When the main controller 100 detects that the air pressure in the air circuit 700 is too high, it will send an opening signal to the drive unit 620. After receiving the signal, the drive unit 620 will immediately generate a corresponding action to drive the pressure relief valve 610 to open and realize the pressure relief function.

[0209] After the air pressure in the air passage 700 returns to normal, the main controller 100 sends a shutdown signal to the drive unit 620, which then promptly controls the pressure relief valve 610 to close, stopping gas discharge and ensuring stable air pressure in the air passage 700. The drive unit 620 features fast response and high control precision, ensuring that the pressure relief valve 610 operates quickly when needed and closes promptly when not needed, thus improving the reliability and stability of the entire pressure relief module 600.

[0210] Reference Figure 1 and Figure 2 According to some embodiments of this disclosure, the dual-drive breast pump also includes a control module, which is electrically connected to the main controller 100 and is capable of adjusting the speed of the dual-drive breast pump.

[0211] The aforementioned control module provides users with a convenient and personalized control method during the use of the dual-drive breast pump. Electrically connected to the main controller 100, the control module accurately transmits user-inputted speed adjustment commands to the main controller 100. Users can flexibly adjust the speed of the dual-drive breast pump using the control module according to their own pumping needs, comfort levels, and different pumping stages.

[0212] For example, in the early stages of breastfeeding, users may prefer a gentler stimulation mode to promote milk production. In this case, the control module can be adjusted to a lower level. Upon receiving the user's input, the control module quickly transmits the signal to the main controller 100. The main controller 100 then precisely controls the booster 410, drive module, and other related components based on this signal, ensuring the dual-drive breast pump operates with appropriate negative pressure and power to simulate a baby's gentle sucking motion, providing the user with a comfortable stimulation experience.

[0213] Once milk production is relatively smooth and lactation has begun, users may need to adjust the pump level according to the milk flow and their own pumping efficiency requirements. By increasing the pump level through the control module, the main controller 100 will adjust the output voltage of the booster 410 accordingly, increasing the working power of the drive module, increasing the negative pressure, and thus increasing the pumping speed to meet the user's need for rapid milk expression during lactation.

[0214] The control module can adopt a simple and clear button design, allowing users to adjust the gear by simply pressing the corresponding button; it can also adopt a touch control panel, where users can switch gears by touching virtual buttons on the screen, making the operation smoother and more modern.

[0215] The control module can be equipped with clear gear positions and indicator lights, allowing users to easily understand the current gear status at any time and ensure accurate operation.

[0216] According to some embodiments of this disclosure, the control module includes at least one of buttons, knobs, virtual keys, gears, and switches.

[0217] Buttons, as common and basic operating components in control modules, are simple, intuitive, and easy to operate. Users can send corresponding speed adjustment signals to the main controller 100 simply by pressing a button. For example, some dual-drive breast pumps have several buttons with different functions, corresponding to increasing / decreasing speed and switching modes. Users can quickly and accurately press the corresponding button to flexibly adjust the device's speed according to their needs.

[0218] The knob provides users with a more continuous way to adjust the pump's settings. By rotating the knob, users can smoothly change the pump's settings, allowing them to more precisely find the setting that best suits their pumping needs. For example, when fine-tuning the pumping force is required, the knob's continuous adjustment feature comes in handy. Users can slowly rotate the knob to gradually increase or decrease the negative pressure until the ideal pumping effect is achieved. The knob design generally emphasizes tactile feedback and resistance, providing users with comfortable operational feedback during rotation, improving both accuracy and comfort.

[0219] Virtual buttons are a touch-based control method. They are displayed virtually on the screen, allowing users to adjust pump levels by touching the virtual buttons. The advantages of virtual buttons include saving physical space on the device and making the control panel more streamlined and aesthetically pleasing. Furthermore, they can be programmed with software to offer more diverse functions, such as setting different pumping modes. Users can easily switch to a preset pumping mode with a single touch, making it convenient and quick.

[0220] The gear disc offers a unique operating experience and precise gear positioning. By rotating the gear disc, the meshing transmission between the gears ensures accurate and stable gear adjustment. In some high-end dual-drive breast pumps, the gear disc design not only emphasizes functionality but also aesthetics.

[0221] Switches can be used in auxiliary functions such as speed adjustment. For example, some switches can be used in different ways, such as long press or short press, to switch between different speed modes or activate specific breast pumping functions. Switch designs generally prioritize ease of use and reliability, ensuring that users can easily turn the device on or off and perform speed-related operations without accidental operation.

[0222] By rationally combining and designing various operating components such as buttons, knobs, virtual keys, gears, and switches, the control module can provide users with a wide variety of convenient and comfortable gear adjustment methods to meet the usage habits and needs of different users.

[0223] According to some embodiments of this disclosure, the dual-drive breast pump also includes a display module electrically connected to the main controller 100, which is capable of displaying real-time parameters of the dual-drive breast pump.

[0224] The aforementioned display module can display key parameter information of the device to the user in real time and intuitively, allowing the user to understand the working status of the device at any time. Through electrical connection with the main controller 100, the display module can accurately acquire various data processed by the main controller 100 and present them to the user in a clear and easy-to-understand manner.

[0225] For example, the display module can show the current suction level of the dual-drive breast pump, allowing users to clearly understand the suction intensity they are using. Whether it's stimulation mode or lactation mode, and the specific suction level value, it's all clearly displayed on the module. This way, users can monitor the suction level at any time during pumping without additional operation or guesswork, making it easy to adjust according to their own comfort.

[0226] The display module can also show pressure parameters, displaying the pressure value within the air passage 700 in real time, allowing users to understand the pressure status during the milk expression process. When abnormal pressure fluctuations occur, users can detect them promptly. For example, if the pressure rises due to blockage in the air passage 700, the change in pressure value on the display module will indicate a potential problem with the equipment, allowing users to take timely measures, such as checking whether the breast shield fits properly or whether there are any blockages, to avoid damage to the equipment or affecting the milk expression effect due to abnormal pressure.

[0227] The display module can also show battery level information. For battery-powered dual-drive breast pumps, battery level is a parameter that users are very concerned about. The display module can accurately show the remaining battery level, allowing users to prepare for charging in advance and avoid interrupting use due to insufficient power during breast pumping, thus avoiding inconvenience to users.

[0228] The display module can offer diverse display options, employing an LCD screen to clearly display various parameters in the form of numbers, graphics, or text. The screen size and brightness can be designed to meet specific usage needs, ensuring easy information reading in various environments. Furthermore, the display module's interface should be simple, clear, and easy to operate, allowing users to quickly obtain the information they need without complex procedures.

[0229] Secondly, referring to Figure 3This disclosure provides a control method for a dual-drive breast pump, applied to the aforementioned dual-drive breast pump. The control method includes the following steps: Step S100: Start the dual-drive breast pump, and provide initial control signals to the first inverter 210 and the second inverter 310 through the main controller 100, and control the boost converter 410 to output the initial voltage. Step S200: Drive the two piezoelectric pumps 220 and 320 connected in series to start working. The air inlet of the first piezoelectric pump 220 is connected to the negative pressure chamber 800 of the dual-drive breast pump, and the air outlet of the first piezoelectric pump 220 is connected to the air inlet of the second piezoelectric pump 320. Step S300: The main controller 100 detects the drive current of the first piezoelectric pump 220 in real time through the first current acquisition unit 230, and provides a control channel for the first inverter 210 to independently adjust the output frequency based on the detected current value. Step S400: The main controller 100 detects the drive current of the second piezoelectric pump 320 in real time through the second current acquisition unit 330, and provides a control channel for the second inverter 310 to independently adjust the output frequency based on the detected current value. Step S500: Perform individual frequency adaptive control on the driving frequencies of the first piezoelectric pump 220 and the second piezoelectric pump 320, so that the driving frequencies of the first piezoelectric pump 220 and the second piezoelectric pump 320 are both within the preset resonant frequency range.

[0230] In the above steps, after starting the dual-drive breast pump, the main controller 100 can provide the inverter with the initial control signal and control the booster 410 to output the initial voltage. It will also continuously monitor the overall operating status of the dual-drive breast pump.

[0231] After the first piezoelectric pump 220 and the second piezoelectric pump 320 connected in series start working, the main controller 100 uses the first current acquisition unit 230 and the second current acquisition unit 330 to detect the drive current of the first piezoelectric pump 220 and the second piezoelectric pump 320 in real time and accurately.

[0232] The magnitude of the drive current directly reflects the operating status of the piezoelectric pump. After detecting the current value, the main controller 100 will provide independent control channels for adjusting the output frequency of the first inverter 210 and the second inverter 310 based on these current values, so that each piezoelectric pump can obtain the most suitable drive frequency according to its actual working conditions.

[0233] The main controller 100 performs individual adaptive frequency control on the drive frequencies of the first piezoelectric pump 220 and the second piezoelectric pump 320. This allows for dynamic adjustment based on the actual needs of the piezoelectric pumps at different operating stages and under different usage environments.

[0234] For example, in the early stages of milk expression, milk secretion is relatively low, and the pressure changes within the negative pressure chamber 800 are relatively gradual. At this time, the main controller 100 will appropriately reduce the drive frequency of the two piezoelectric pumps to allow them to operate in a gentler manner, which can meet the initial milk expression needs while avoiding excessive wear and tear on the equipment due to excessive frequency.

[0235] When lactation begins, milk production increases, and the pressure changes within the negative pressure chamber 800 accelerate. The main controller 100 promptly increases the drive frequency of the two piezoelectric pumps to enhance the suction force and efficiency, ensuring that milk is extracted quickly and effectively. This frequency adaptive control ensures that the drive frequencies of the first piezoelectric pump 220 and the second piezoelectric pump 320 remain within the preset resonant frequency range.

[0236] Piezoelectric pumps operating within the resonant frequency range have the highest efficiency, achieving maximum milk expression with minimal energy consumption while also reducing equipment vibration and noise, providing users with a more comfortable and quieter operating environment.

[0237] Throughout the control process, the main controller 100 can continuously receive and analyze various data, and make corresponding controls based on these data to control the various components of the dual-drive breast pump to work together, ensuring that the equipment can operate stably and efficiently, and providing users with a high-quality breast pumping experience.

[0238] Reference Figure 4 According to some embodiments of this disclosure, the control method further includes the following steps: Step S510: The main controller 100 determines the target negative pressure value according to the suction level set by the user, and obtains the actual pressure value of the negative pressure chamber 800 in real time through the pressure acquisition unit 520. Step S520: The main controller 100 compares the actual pressure value with the target negative pressure value, and adjusts the output voltage of the booster 410 through PID or other control algorithms, thereby controlling the drive voltage applied to the first piezoelectric pump 220 and the second piezoelectric pump 320. Step S530: When the actual pressure is lower than the target pressure, increase the output voltage of the booster 410 to increase the pump's pumping capacity; Step S540: When the actual pressure is higher than the target pressure, reduce the output voltage of the booster 410 to reduce the pump's pumping capacity, so that the actual pressure is stabilized within the allowable error range of the target pressure value.

[0239] In actual use of the dual-drive breast pump, the above control method allows users to set a suitable suction level based on their own comfort and pumping needs. Upon receiving the user-set suction level, the main controller 100 quickly determines the corresponding target negative pressure value. This target negative pressure value is a crucial basis for subsequent adjustments by the main controller 100, reflecting the pumping force the user expects the dual-drive breast pump to achieve.

[0240] Meanwhile, the pressure acquisition unit 520 continues to operate, acquiring the actual pressure value within the negative pressure chamber 800 in real time. The pressure acquisition unit 520 can accurately capture subtle changes in pressure within the negative pressure chamber 800 and promptly feed this information back to the main controller 100.

[0241] After acquiring the actual pressure value, the main controller 100 carefully compares it with a pre-determined target negative pressure value. If the actual pressure is found to be lower than the target pressure, it is determined that the current milk suction strength is insufficient and cannot meet the user's needs. At this time, the main controller 100 can increase the pump's suction capacity by adjusting the output voltage of the booster 410. The increase in the output voltage of the booster 410 will provide a stronger driving voltage to the first piezoelectric pump 220 and the second piezoelectric pump 320, thereby accelerating the suction speed, increasing the pressure in the negative pressure chamber 800, and increasing the milk suction strength.

[0242] Conversely, when the main controller 100 determines that the actual pressure is higher than the target pressure, it indicates that the current milk suction force is too strong and may cause discomfort to the user. To avoid this situation, the main controller 100 will reduce the output voltage of the booster 410, thereby reducing the pump's suction capacity. In this way, the pressure in the negative pressure chamber 800 will gradually decrease, and the milk suction force will be weakened accordingly, ensuring that the actual pressure remains stable within the allowable error range of the target pressure value.

[0243] Throughout the adjustment process, the main controller 100 can utilize PID or other advanced control algorithms to precisely calculate the adjustment amount of the booster 410's output voltage based on the difference between the actual and target pressures and their changing trends. This precise adjustment method enables the dual-drive breast pump to maintain a stable suction force, providing users with a comfortable and efficient breast pumping experience. Whether it's the initial stage of breastfeeding with low milk production or the later stages of lactation with abundant milk production, the dual-drive breast pump can automatically adjust the suction force according to the user's settings and actual needs, meeting the breast pumping requirements at different stages.

[0244] Furthermore, the core logic of the above control method is to achieve precise negative pressure control of the dual piezoelectric pumps through pressure closed-loop feedback. Its core objective is to ensure that the output pressure of the breast pump is highly consistent with the suction level set by the user, thereby effectively solving the pressure fluctuation problem caused by individual differences in piezoelectric pumps and environmental changes.

[0245] In terms of specific steps, the first step is to determine the target negative pressure value. The user sets the suction level (e.g., stimulation mode, lactation mode) through the control module (such as buttons or knobs). The main controller 100 maps these levels to specific target negative pressure values; for example, stimulation mode corresponds to -5kPa to -8kPa, and lactation mode corresponds to -12kPa to -18kPa. These target negative pressure values ​​are pre-set in the main controller 100 firmware and can be expanded through firmware upgrades. The second step is real-time monitoring of the actual pressure, which relies on the pressure acquisition unit 520. This unit includes a pressure sensor, signal amplifier, and filter, enabling real-time detection of the actual pressure value within the air passage 700. Its sampling frequency is no less than 1kHz, and the measurement accuracy is ±0.1kPa, ensuring data accuracy. The acquired pressure signal is filtered (low-pass filter cutoff frequency 10Hz) and converted by an A / D converter before being transmitted to the main controller 100, thereby eliminating noise interference.

[0246] Next, the pressure deviation adjustment algorithm is applied. The main controller 100 uses a PID (proportional-integral-derivative) algorithm to compare the actual pressure with the target pressure and calculate the output voltage adjustment of the booster 410. When the actual pressure is lower than the target value, the PWM duty cycle of the booster 410 is increased to increase the output voltage (e.g., from 10V to 15V) to enhance the pumping capacity of the dual-pump system; conversely, when the actual pressure is higher than the target value, the duty cycle is decreased to reduce the voltage (e.g., from 15V to 12V) to weaken the pumping capacity. The cycle of this adjustment process does not exceed 50ms, ensuring that the pressure remains stable within the error range of ±0.3kPa of the target value. Finally, there is a dual-pump coordination and safety mechanism. The output voltage of the booster 410 simultaneously acts on the first and second drive modules 300 to ensure the stability of the negative pressure superposition effect of the dual pumps. For example, the main pump provides the base negative pressure, and the slave pump compensates for pressure fluctuations through frequency tracking. At the same time, when the pressure exceeds the safety threshold (e.g., -30kPa), the main controller 100 will immediately cut off the output of the booster 410 to prevent damage to the breast tissue.

[0247] The aforementioned control method eliminates suction deviations caused by individual differences in piezoelectric pumps (such as process errors and temperature drift) through pressure closed-loop feedback, ensuring that the pressure output error between different devices does not exceed ±0.1 kPa. Furthermore, it offers precise gear matching, supporting multiple pressure levels, such as 5-10V for stimulation mode and 15-24V for lactation mode, meeting the needs of different breastfeeding stages. Moreover, optimized energy efficiency avoids continuous full-power operation, reducing current consumption by 30% at lower levels, extending the battery life of the 2000mAh battery to over 2 hours.

[0248] In terms of application scenario adaptation, the aforementioned control method can dynamically adapt to load changes. During breast pumping, when the elasticity of breast tissue changes or the airway 700 seal fluctuates, the voltage is quickly adjusted through real-time pressure feedback to maintain stable suction, thereby reducing the user's engorgement and pain. Simultaneously, during multi-mode switching, such as from stimulation mode to lactation mode, the pressure transition is smooth, completing the target pressure switch within 300ms, avoiding discomfort caused by sudden negative pressure changes.

[0249] Reference Figure 5 Furthermore, during the operation of the breast pump, the system continuously tracks the frequency of the piezoelectric pump to ensure it always operates at its resonant frequency, thus maintaining optimal performance. This process is achieved through a power-tracking variable frequency drive control flow, which aims to find the optimal operating point of the pump by gradually adjusting the drive frequency.

[0250] The process first enters the initialization phase, where the boost converter 410 outputs a specific value to provide a stable power supply to the system; simultaneously, the inverter is driven using a certain initial frequency to start the electric pump. Next, the drive current I1 of the electric pump is acquired through the current acquisition unit, and the power P1 is calculated based on this, which serves as the benchmark for subsequent performance comparisons.

[0251] The system then enters the frequency optimization phase, increasing the drive frequency by a step value. It then acquires the new drive current I2 again through the current acquisition unit and calculates the power P2. Next, a performance comparison and decision are made, based on whether I2 is greater than I1 or whether P2 is greater than P1. If the condition is met, it indicates that the load or power of the electric pump has increased after increasing the frequency, and the system determines that the optimal operating point has not yet been reached, continuing to cycle through increasing the frequency step value. If the condition is not met, it means that the load or power no longer increases after increasing the frequency, and the optimal efficiency point has been found.

[0252] Finally, in the optimal frequency locking stage, the system drives the electric pump at the drive frequency corresponding to the generation of I1 / P1, that is, locking the frequency that generated the maximum current or power in the previous cycle, thereby ensuring that the electric pump operates stably in the most efficient state. Subsequent frequency tracking logic will also follow the above logic.

[0253] Reference Figure 6 Furthermore, closed-loop pressure control enables consistent pressure regulation across breast pumps equipped with different pump bodies. This is achieved through a closed-loop pressure control process, which is an automatic control procedure that maintains the pressure within a set range by adjusting the output voltage of the booster 410.

[0254] The entire process first enters the initialization phase, where the desired pressure range (target value) needs to be preset manually. The system then gives the booster 410 an initial output voltage based on the initial settings, and then enters the target value waiting state while continuously monitoring the current actual pressure value.

[0255] When the target time is reached, the system will make the first judgment: if the pressure is within the preset threshold range, it will directly drive according to the corresponding voltage to maintain the current state; if the pressure is not within the threshold range, it will proceed to the second judgment.

[0256] The second judgment focuses on the relationship between pressure and threshold. If the pressure is higher than the threshold, it indicates that the output voltage of the booster 410 is too high and the output voltage of the booster 410 needs to be reduced. If the pressure is lower than the threshold, it means that the output voltage of the booster 410 is too low and the output voltage of the booster 410 needs to be increased.

[0257] Regardless of whether the voltage increases or decreases, the system will reset the target value waiting time, then return to the target value waiting time while simultaneously detecting the pressure, and begin a new round of monitoring and judgment.

[0258] The above process embodies typical feedback control logic, which continuously detects pressure, compares thresholds, and adjusts voltage to ultimately stabilize the pressure within a preset range.

[0259] The foregoing has described specific embodiments of this disclosure. Other embodiments are within the scope of the appended claims. In some cases, the actions or steps recited in the claims may be performed in a different order than that shown in the embodiments and may still achieve the desired result. Furthermore, the processes depicted in the drawings do not necessarily require a specific or sequential order to achieve the desired result. In some embodiments, multitasking and parallel processing are possible or may be advantageous.

[0260] In summary, after reading this detailed disclosure, those skilled in the art will understand that the foregoing detailed disclosure may be presented by way of example only and may not be restrictive. Although not explicitly stated herein, those skilled in the art will understand that the requirements of this disclosure encompass various reasonable changes, improvements, and modifications to the embodiments. These changes, improvements, and modifications are intended to be made by this disclosure and are within the spirit and scope of the exemplary embodiments of this disclosure.

[0261] Furthermore, certain terms used in this disclosure have been used to describe embodiments of this disclosure. For example, "an embodiment," "an embodiment," and / or "some embodiments" mean that a particular feature, structure, or characteristic described in connection with that embodiment may be included in at least one embodiment of this disclosure. Therefore, it is to be emphasized and understood that two or more references to "an embodiment" or "an embodiment" or "alternative embodiment" in various parts of this disclosure do not necessarily refer to the same embodiment. Moreover, specific features, structures, or characteristics may be suitably combined in one or more embodiments of this disclosure.

[0262] It should be understood that in the foregoing description of the embodiments of this disclosure, various features are combined in a single embodiment, drawing, or description for the purpose of simplifying the disclosure and to aid in understanding a feature. However, this does not mean that the combination of these features is necessary, and those skilled in the art, upon reading this disclosure, may readily identify some of the devices as separate embodiments. That is, the embodiments in this disclosure can also be understood as an integration of multiple secondary embodiments. It is also valid when each secondary embodiment contains fewer than all the features of a single foregoing disclosed embodiment.

[0263] Every patent, patent publication, publication of a patent publication, and other material, such as articles, books, specifications, publications, documents, and literature (excluding any related historical examination documents), cited in this disclosure is incorporated herein for all purposes, including, for example, in the specification and claims of this disclosure. However, in the event of any inconsistency or conflict between the descriptions, definitions, and / or terms used in the foregoing and those used in this disclosure, the descriptions, definitions, and / or terms used in this disclosure shall prevail.

[0264] Finally, it should be understood that the embodiments disclosed herein are illustrative of the principles of the embodiments of this disclosure. Other modified embodiments are also within the scope of this disclosure. Therefore, the embodiments disclosed herein are merely examples and not limitations. Those skilled in the art can adopt alternative configurations based on the embodiments in this disclosure to implement the disclosures herein. Therefore, the embodiments of this disclosure are not limited to the embodiments precisely described in the disclosure.

Claims

1. A dual-drive breast pump, characterized in that, include: Main controller; The first drive module is electrically connected to the main controller. The first drive module is directly or indirectly connected to the negative pressure chamber of the milk pumping body through an air passage. The first drive module can generate an adjustable first negative pressure relative to the negative pressure chamber. as well as The second drive module is electrically connected to the main controller and connected in series with the first drive module. The second drive module is directly or indirectly connected to the negative pressure chamber and can generate an adjustable second negative pressure relative to the negative pressure chamber. The first drive module and the second drive module can be controlled independently and form two first control closed loops. At least one of the first drive module and the second drive module can achieve frequency tracking by adjusting the drive frequency.

2. The dual-drive breast pump according to claim 1, characterized in that, The first drive module includes: The first inverter is electrically connected to the main controller; A first piezoelectric pump, electrically connected to the first inverter, is configured to be controlled by the main controller in conjunction with the first inverter, and is connected to the gas path; and The first current acquisition unit has a first terminal electrically connected to the main controller and a second terminal electrically connected to the first inverter. The first current acquisition unit can acquire the current parameters of the circuit where the first inverter is located and transmit the acquired current parameters to the main controller. The main controller, the first inverter, and the first current acquisition unit work together to form a first control closed loop.

3. The dual-drive breast pump according to claim 2, characterized in that, The second drive module includes: The second inverter is electrically connected to the main controller; A second piezoelectric pump, electrically connected to the second inverter, is configured to be controlled by the main controller in conjunction with the second inverter. The second piezoelectric pump is connected to the pneumatic circuit, wherein the second piezoelectric pump and the first piezoelectric pump are connected in series. The second current acquisition unit has its second terminal electrically connected to the main controller and the second inverter. The second current acquisition unit can acquire the current parameters of the circuit where the second inverter is located and transmit the acquired current parameters to the main controller. The main controller, the second inverter, and the second current acquisition unit work together to form a first control closed loop.

4. The dual-drive breast pump according to claim 3, characterized in that, The first piezoelectric pump is the main pump, and the second piezoelectric pump is the slave pump. The air inlet of the main pump is connected to the negative pressure chamber of the dual-drive breast pump, the air outlet of the main pump is connected to the air inlet of the slave pump, and the air outlet of the slave pump is connected to the outside.

5. The dual-drive breast pump according to claim 3, characterized in that, The first piezoelectric pump is the master pump, and the second piezoelectric pump is the slave pump. The main pump includes a first air inlet, a first air outlet, a second air inlet, and a second air outlet. The first air inlet is connected to the negative pressure chamber, the first air inlet is connected to the first air outlet, the first air outlet is connected to the second air inlet, the second air inlet is connected to the second air outlet, and the second air outlet is connected to the slave pump. The pump includes a third suction port, a third discharge port, a fourth suction port, and a fourth discharge port. The third suction port is connected to the main pump, the third suction port is connected to the third discharge port, the third discharge port is connected to the fourth suction port, the fourth suction port is connected to the fourth discharge port, and the fourth discharge port is connected to the outside.

6. The dual-drive breast pump according to claim 3, characterized in that, The first current acquisition unit or the second current acquisition unit includes at least one of a Hall sensor, a current transformer, a shunt, a Rogowski coil, an optical fiber current sensor, or an integrated current sensor chip.

7. The dual-drive breast pump according to claim 3, characterized in that, At least one of the first current acquisition unit or the second current acquisition unit is provided with a signal amplifier or filter.

8. The dual-drive breast pump according to any one of claims 1 to 7, characterized in that, Also includes: The voltage control module can provide an adjustable voltage. Its first terminal is electrically connected to the main controller, and its second terminal is electrically connected to both the first drive module and the second drive module. as well as The pressure detection module has a first end electrically connected to the main controller and a second end connected to the air circuit and capable of detecting the air pressure in the air circuit. The voltage control module and the pressure detection module can work together to control the power of the entire dual-drive breast pump and form a second control closed loop.

9. The dual-drive breast pump according to claim 8, characterized in that, The voltage control module includes: A boost converter, with its first end electrically connected to the main controller and its second end electrically connected to both the first drive module and the second drive module, is also electrically connected to a low-voltage power supply. The voltage acquisition unit has a first terminal electrically connected to the main controller, and a second terminal electrically connected to both the first drive module and the second drive module. The main controller, in conjunction with the voltage acquisition unit and the boost converter, can control the driving voltage of the first drive module and the second drive module.

10. The dual-drive breast pump according to claim 9, characterized in that, The voltage acquisition unit includes at least one of the following: voltage sensor, analog-to-digital converter, voltage divider resistor, operational amplifier, isolation amplifier, and optocoupler isolation module.

11. The dual-drive breast pump according to claim 9, characterized in that, The pressure detection module includes: A pressure detection unit, connected to the air path, is capable of detecting the air pressure within the air path; and A pressure acquisition unit is electrically connected to the pressure detection unit and connected to the main controller. The pressure acquisition unit can acquire the negative pressure signal of the pressure detection unit and transmit it to the main controller. The pressure detection unit and the pressure acquisition unit work together to monitor the current operating power of the dual-drive breast pump.

12. The dual-drive breast pump according to claim 11, characterized in that, The pressure acquisition unit includes at least one of a pressure sensor, a negative pressure sensor, a differential pressure sensor, an absolute pressure sensor, and a pressure transmitter.

13. The dual-drive breast pump according to claim 11, characterized in that, The pressure acquisition unit is equipped with a signal amplifier or filter.

14. The dual-drive breast pump according to claim 11, characterized in that, The main controller, the voltage acquisition unit, the booster, the pressure detection unit, and the pressure acquisition unit work together to form a second control closed loop.

15. The dual-drive breast pump according to any one of claims 1 to 7, characterized in that, The dual-drive breast pump also includes a pressure relief module. The first end of the pressure relief module is electrically connected to the main controller, and the second end of the pressure relief module is connected to the air path where the negative pressure chamber is located. The pressure relief module can relieve pressure on the air path.

16. The dual-drive breast pump according to claim 15, characterized in that, The pressure relief module includes: Pressure relief valve, connected to the gas path; and The drive unit is electrically connected to the pressure relief valve and also electrically connected to the main controller; The main controller can control the drive unit to open and close the pressure relief valve.

17. The dual-drive breast pump according to any one of claims 1 to 7, characterized in that, The dual-drive breast pump also includes a control module, which is electrically connected to the main controller and can adjust the speed of the dual-drive breast pump.

18. The dual-drive breast pump according to any one of claims 1 to 7, characterized in that, The dual-drive breast pump also includes a display module, which is electrically connected to the main controller and can display the real-time parameters of the dual-drive breast pump.

19. A control method for a dual-drive breast pump, characterized in that, The control method, applied to any one of claims 1 to 18, comprises the following steps: When the dual-drive breast pump is started, the main controller provides initial control signals to the first and second inverters respectively, and controls the boost converter to output the initial voltage. The first and second piezoelectric pumps, which are connected in series, are started to work. The air inlet of the first piezoelectric pump is connected to the negative pressure chamber of the dual-drive breast pump, and the air outlet of the first piezoelectric pump is connected to the air inlet of the second piezoelectric pump. The main controller detects the drive current of the first piezoelectric pump in real time through the first current acquisition unit, and provides a control channel for the first inverter to independently adjust the output frequency based on the detected current value. The main controller detects the drive current of the second piezoelectric pump in real time through the second current acquisition unit, and provides a control channel for the second inverter to independently adjust the output frequency based on the detected current value. The driving frequencies of the first piezoelectric pump and the second piezoelectric pump are individually adaptively controlled so that the driving frequencies of both the first piezoelectric pump and the second piezoelectric pump are within a preset resonant frequency range.

20. The control method for the dual-drive breast pump according to claim 19, characterized in that, The control method further includes the following steps: The main controller determines the target negative pressure value based on the suction level set by the user, and obtains the actual pressure value of the negative pressure chamber in real time through the pressure acquisition unit; The main controller compares the actual pressure value with the target negative pressure value and adjusts the output voltage of the booster through PID or other control algorithms, thereby controlling the drive voltage applied to the first piezoelectric pump and the second piezoelectric pump. When the actual pressure is lower than the target pressure, increase the output voltage of the booster to increase the pump's pumping capacity. When the actual pressure is higher than the target pressure, the output voltage of the booster is reduced to decrease the pump's pumping capacity, so that the actual pressure is stabilized within the allowable error range of the target pressure value.

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