System for driving piezoelectric ceramic pumping

Abstract

The utility model discloses a system for driving piezoelectric ceramic pumping, and relates to the technical field of driving circuits. The device comprises a liquid-electric switch module, a power supply voltage module, an operation module with a communication unit, a piezoelectric ceramic driving module, a liquid leakage detection module, a battery voltage detection module, a sound-light alarm module and an interface module, the interface module comprises a piezoelectric ceramic driving voltage interface, a low-voltage power supply interface, a pressure sensor interface, a temperature sensor interface and a calibration data signal interface, and the electro-hydraulic switch module is electrically connected with the power supply voltage module and the battery voltage detection module. A first output end of the power supply voltage module is electrically connected with an operation module with a communication unit, a liquid leakage detection module, a sound-light alarm module, a low-voltage power supply interface, a pressure sensor interface, a temperature sensor interface and a signal interface for calibrating data respectively, and a second output end of the power supply voltage module is electrically connected with the piezoelectric ceramic driving module; the size of the system is reduced through the liquid-electric switch module and the like.

Description

Technical Field

[0001] This utility model relates to the field of drive circuit technology, and in particular to a system for driving piezoelectric ceramic pumps. Background Technology

[0002] Piezoelectric ceramics, as a type of smart material capable of converting mechanical energy into electrical energy, have extremely broad application prospects. They play a crucial role in numerous fields such as sensors, actuators, ultrasonic transducers, and microelectromechanical systems (MEMS). In the field of actuators, piezoelectric ceramics can generate precise deformation or displacement based on applied electrical signals, and can be applied to lens adjustment in precision optical instruments, driving micro-pumps, etc., to achieve precise control of tiny components or systems.

[0003] 1. Requirements for driving piezoelectric ceramics:

[0004] Effective driving of piezoelectric ceramics faces numerous challenges. Piezoelectric ceramics typically require relatively high driving voltages to fully realize their performance, generally ranging from tens to hundreds of volts. However, in most common electronic devices and systems, the power supply voltage is often relatively low; for example, common battery power supply voltages are mostly between 3 and 12 volts, and the output voltage of power chips inside electronic devices is generally only a few volts to over twenty volts. This contradiction between low voltage and the high driving voltage required by piezoelectric ceramics significantly limits their performance and widespread application in many scenarios.

[0005] 2. Characteristics and problems of existing drive circuit technologies:

[0006] Existing driving methods have significant shortcomings. For example, when using transformers for boost driving, the transformers are large and bulky, and their frequency response characteristics are poor, making it difficult to meet the requirements of some applications with high requirements for response speed and size, such as driving piezoelectric ceramics in portable ultrasonic equipment or small MEMS devices. Furthermore, some boost circuits based on the charge pump principle, while achieving voltage boost to a certain extent, suffer from low efficiency and generate significant heat loss during energy conversion. This not only reduces the overall efficiency of the system but may also cause thermal interference to surrounding electronic components, affecting the system's stability and reliability, especially under long-term continuous operation or in environments with stringent heat dissipation requirements. Therefore, there is an urgent need for a high-efficiency, compact, and stable boost circuit to drive piezoelectric ceramics, overcoming the shortcomings of existing technologies and expanding the application potential of piezoelectric ceramics in more fields.

[0007] 3. Technical features and problems of existing boost circuits:

[0008] Existing boost circuits driving piezoelectric ceramics suffer from incomplete voltage discharge after power failure. Therefore, when piezoelectric ceramics undergo rapid voltage conversion, a high-power circuit is required for rectification.

[0009] 4. Integrates Bluetooth communication with circuit switching, leakage detection, battery voltage detection, and buzzer alarm functions.

[0010] 5. The need to integrate pressure detection, temperature measurement, and calibration data.

[0011] Analysis of existing technical solutions reveals the following technical problems that need to be addressed.

[0012] 1. The power switch occupies too large an area on the PCB board.

[0013] 2. The lack of integration between the boost circuit and the control circuit results in numerous wiring connections and a large size.

[0014] 3. The circuit board is too large in size and weight to meet the requirements of equipment with strict size and weight requirements. Utility Model Content

[0015] This invention provides a system for driving piezoelectric ceramic pumps, solving the technical problem of the large size of the entire system.

[0016] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows:

[0017] A system for driving a piezoelectric ceramic pump includes a hydraulic-electric switch module, a power supply voltage module, a computing module with a communication unit, a piezoelectric ceramic driving module, a leakage detection module, a battery voltage detection module, an audible and visual alarm module, and an interface module. The interface module includes a piezoelectric ceramic driving voltage interface, a low-voltage power supply interface, a pressure sensor interface, a temperature sensor interface, and a calibration data signal interface. The hydraulic-electric switch module is electrically connected to both the power supply voltage module and the battery voltage detection module. The first output terminal of the power supply voltage module is connected to the computing module with the communication unit, the leakage detection module, the audible and visual alarm module, the low-voltage power supply interface, and the pressure sensor interface. The sensor interface, temperature sensor interface, and calibration data signal interface are electrically connected. The second output terminal of the power supply voltage module is electrically connected to the piezoelectric ceramic drive module. The battery voltage detection module is electrically connected to the computing module with a communication unit. The leakage detection module is electrically connected to the computing module with a communication unit. The computing module with a communication unit is electrically connected to the audible and visual alarm module, low-voltage power supply interface, pressure sensor interface, temperature sensor interface, and calibration data signal interface, respectively. The control terminal of the computing module with a communication unit is electrically connected to the control terminal of the piezoelectric ceramic drive module. The piezoelectric ceramic drive module is electrically connected to the piezoelectric ceramic drive voltage interface.

[0018] A further technical solution is as follows: the piezoelectric ceramic driving module includes a first boost circuit, a second boost circuit, a first bleeder circuit, and a second bleeder circuit; the second output terminal of the power supply voltage module is electrically connected to the first boost circuit, and the second output terminal of the power supply voltage module is electrically connected to the second boost circuit; the first control terminal PWM1 of the computing module with the communication unit is electrically connected to the control terminal of the first boost circuit; the first boost circuit is electrically connected to the first bleeder circuit; and the first bleeder circuit is electrically connected to the piezoelectric ceramic driving voltage interface; the second control terminal PWM2 of the computing module with the communication unit is electrically connected to the control terminal of the second boost circuit; the second boost circuit is electrically connected to the second bleeder circuit; and the second bleeder circuit is electrically connected to the piezoelectric ceramic driving voltage interface.

[0019] A further technical solution includes a leakage detection electrode, wherein the leakage detection module is electrically connected to the leakage detection electrode.

[0020] A further technical solution includes a pressure sensor, a temperature sensor, and a calibration data module. The low-voltage power supply interface is electrically connected to the pressure sensor, the temperature sensor, and the calibration data module, respectively. The pressure sensor interface is electrically connected to the pressure sensor, the temperature sensor interface is electrically connected to the temperature sensor, the calibration data signal interface is electrically connected to the calibration data module, and the piezoelectric ceramic drive voltage interface is electrically connected to the pressure sensor, the temperature sensor, and the calibration data module, respectively.

[0021] A further technical solution is that the computing module with the communication unit is a Bluetooth communication and computing module, and the communication unit is a Bluetooth communication unit.

[0022] The beneficial effects of adopting the above technical solution are as follows:

[0023] A system for driving a piezoelectric ceramic pump includes a hydraulic-electric switch module, a power supply voltage module, a computing module with a communication unit, a piezoelectric ceramic driving module, a leakage detection module, a battery voltage detection module, an audible and visual alarm module, and an interface module. The interface module includes a piezoelectric ceramic driving voltage interface, a low-voltage power supply interface, a pressure sensor interface, a temperature sensor interface, and a calibration data signal interface. The hydraulic-electric switch module is electrically connected to both the power supply voltage module and the battery voltage detection module. The first output terminal of the power supply voltage module is connected to the computing module with the communication unit, the leakage detection module, the audible and visual alarm module, the low-voltage power supply interface, and the pressure sensor interface. The sensor interface, temperature sensor interface, and calibration data signal interface are electrically connected. The second output terminal of the power supply voltage module is electrically connected to the piezoelectric ceramic drive module. The battery voltage detection module is electrically connected to the computing module with a communication unit. The leakage detection module is electrically connected to the computing module with a communication unit. The computing module with the communication unit is electrically connected to the audible and visual alarm module, low-voltage power supply interface, pressure sensor interface, temperature sensor interface, and calibration data signal interface, respectively. The control terminal of the computing module with the communication unit is electrically connected to the control terminal of the piezoelectric ceramic drive module. The piezoelectric ceramic drive module is electrically connected to the piezoelectric ceramic drive voltage interface. The system size is reduced through the use of electrohydraulic switch modules, etc.

[0024] See the detailed implementation section for further description. Attached Figure Description

[0025] Figure 1 This is a principle block diagram of Embodiment 1 of this utility model;

[0026] Figure 2-1 yes Figure 1 Circuit diagram of the first boost circuit and the first bleeder circuit;

[0027] Figure 2-2 yes Figure 1 Circuit diagram of the second boost circuit and the second bleeder circuit;

[0028] Figure 3 yes Figure 1 Block diagram of the leakage detection module;

[0029] Figure 4 yes Figure 1 Circuit diagram of the battery voltage detection module;

[0030] Figure 5 This is a circuit diagram of Embodiment 2 of this utility model. Detailed Implementation

[0031] Based on the above situation and combined with actual use scenarios, a circuit that includes functions such as piezoelectric ceramic driving, Bluetooth communication and circuit switching, leakage detection, battery voltage detection, buzzer alarm, access pressure detection, temperature measurement, and calibration data has emerged.

[0032] like Figure 1 As shown, the circuit consists of a liquid-electric switch module, a power supply voltage module, a Bluetooth communication and computing module, a piezoelectric ceramic drive module, a leakage detection module, a battery voltage detection module, an audible and visual alarm module, and an interface module. The interface module includes a piezoelectric ceramic drive voltage interface, a 3.3V power supply interface, a pressure sensor, a temperature sensor, and a signal interface for calibration data.

[0033] The modules are described below:

[0034] Hydraulic-electric switch module:

[0035] Problems solved: The electrohydraulic switch solves the problem of excessive area of ​​power switches on PCB boards, and also solves the problems of electric shock hazards and electrical safety that may occur during equipment maintenance, troubleshooting, or long-term non-use.

[0036] Effects: This integrated design can greatly reduce the overall size of the device, reduce the number of connecting parts and interfaces, optimize the system's resource utilization efficiency, and improve the system's stability and reliability.

[0037] Technical features: By combining a liquid circuit switch with a power supply voltage switch, the electrical connection between the power input and the internal circuitry of the device is physically severed.

[0038] Piezoelectric ceramic drive module:

[0039] The problems solved include: inconsistent driving voltage of piezoelectric ceramics; incomplete discharge of the restraining voltage when piezoelectric ceramics need to switch driving voltages quickly; and the large size of the piezoelectric ceramic driving module circuit.

[0040] Results: It possesses high-efficiency boost capability and high voltage conversion efficiency, extending the overall system lifespan and improving stability. Its rapid dynamic response capability enhances the response speed and operating frequency range of piezoelectric ceramics, enabling more precise and faster mechanical energy to electrical energy conversion, thus improving overall system performance and signal processing capabilities. It allows for a high degree of miniaturization and integration, while reducing system design and manufacturing costs.

[0041] Technical Features: Utilizing a two-stage boost converter, the battery voltage is converted to a stable 5V and then connected to a boost circuit to raise it to a high voltage range suitable for driving piezoelectric ceramics. The innovative circuit design employs a boost converter with an integrated current mirror to achieve the effect of a low-power boost power chip, accurately boosting lower input voltages to a high voltage range suitable for driving piezoelectric ceramics. Compared to traditional boost circuits, this significantly reduces energy loss, ensuring sufficient driving energy for the piezoelectric ceramics while minimizing heat generation, making it particularly suitable for driving piezoelectric ceramics in portable devices or those with stringent power consumption requirements. A residual current discharge circuit allows the driving voltage to be quickly reduced to 0V. When the piezoelectric ceramics require rapid switching of driving voltage, the output voltage can be quickly adjusted, reducing voltage rise and fall times.

[0042] The difference from existing technologies is that the peripheral circuitry has 22 fewer resistors and capacitors, and 2 fewer MOSFETs than CN2023226891859. The input voltage has also been changed to 3V, allowing it to be driven by a single 3V battery, thus reducing energy consumption.

[0043] Bluetooth communication and computing module:

[0044] Problems solved: The Bluetooth antenna has a small radiation range. The Bluetooth communication and processing module circuit is relatively large.

[0045] Results: The edge-mounted antenna design optimizes antenna radiation performance without increasing the overall PCB board area. Advantages include miniaturization and improved reliability, low power consumption extending battery life and compatibility with the Internet of Things (IoT), strong and stable connectivity with considerable range, rich functionality and expandability, and cost-effectiveness. Bluetooth communication enables remote monitoring and control of the system, allowing users to operate and check the system's status anytime, anywhere via mobile phones and other external devices, improving system usability and flexibility. It is suitable for applications such as remote medical equipment and smart homes.

[0046] Technical features: It utilizes the edge space of the PCB board that was originally not fully utilized. It uses a Bluetooth SoC as the main controller, and the Bluetooth communication and computing module circuits are highly integrated.

[0047] Leakage detection module:

[0048] Problem to be solved: Leakage was found between the drug solution and the driving fluid.

[0049] Effect: The real-time monitoring and audible and visual alarm functions of the leakage detection module and the battery voltage detection module can promptly detect potential problems in the system and issue early warnings, ensuring that the system operates in a safe and reliable state and avoiding equipment damage or work interruption caused by liquid leakage or insufficient battery power.

[0050] Technical features: It adopts a high-precision resistor detection system consisting of two resistors connected in series for voltage division, and external circuit detection, which reduces the risk of drug dilution caused by leakage of hydraulic fluid from the drug reservoir, and ensures the safety of users.

[0051] Overall circuit layout:

[0052] Problem to be solved: The circuit is too heavy.

[0053] Effect: Product miniaturization.

[0054] Technical Features: This design maximizes circuit area utilization and reduces PCB weight within limited space. It integrates a hydraulic-electric switch module, power supply voltage module, Bluetooth communication and computing module, piezoelectric ceramic drive module, leakage detection module, battery voltage detection module, audible and visual alarm module, and interface module within a confined space. The interface module includes a piezoelectric ceramic drive voltage interface, a low-voltage power supply interface, a pressure sensor, a temperature sensor, and a calibration data signal interface. It incorporates Bluetooth functionality, power switching, drive control, and alarm functions, demonstrating strong integration.

[0055] Alternative solutions or other feasible technical solutions:

[0056] There is no single correct Bluetooth SoC selection method.

[0057] The circuit for driving piezoelectric ceramics is not unique.

[0058] Antenna layout is not unique.

[0059] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit this application or its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0060] Many specific details are set forth in the following description in order to provide a full understanding of this application. However, this application may also be implemented in other ways different from those described herein. Those skilled in the art can make similar extensions without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0061] Example 1:

[0062] like Figures 1-4As shown, this utility model discloses a system for driving a piezoelectric ceramic pump, comprising a hydraulic-electric switch module, a power supply voltage module, a Bluetooth communication and computing module, a piezoelectric ceramic drive module, a leakage detection module, a battery voltage detection module, an audible and visual alarm module, and an interface module. The interface module includes a piezoelectric ceramic drive voltage interface, a low-voltage power supply interface, a pressure sensor interface, a temperature sensor interface, and a calibration data signal interface. The hydraulic-electric switch module is electrically connected to the power supply voltage module and the battery voltage detection module. The first output terminal of the power supply voltage module is electrically connected to the Bluetooth communication and computing module, the leakage detection module, the audible and visual alarm module, the low-voltage power supply interface, the pressure sensor interface, the temperature sensor interface, and the calibration data signal interface. The second output terminal of the power supply voltage module is electrically connected to the piezoelectric ceramic drive module. The battery voltage detection module is electrically connected to the Bluetooth communication and computing module. The leakage detection module is electrically connected to the Bluetooth communication and computing module and to the leakage detection electrode. The Bluetooth communication and computing module is electrically connected to the audible and visual alarm module, the low-voltage power supply interface, the pressure sensor interface, the temperature sensor interface, and the calibration data signal interface.

[0063] like Figure 1 As shown, the low-voltage power supply interface is electrically connected to the pressure sensor, temperature sensor, and calibration data module, respectively. The pressure sensor interface is electrically connected to the pressure sensor, the temperature sensor interface is electrically connected to the temperature sensor, and the calibration data signal interface is electrically connected to the calibration data module.

[0064] The piezoelectric ceramic driving module includes a first boost circuit, a second boost circuit, a first bleeder circuit, and a second bleeder circuit. The first control terminal PWM1 of the Bluetooth communication and computing module is electrically connected to the control terminal of the first boost circuit, the first boost circuit is electrically connected to the first bleeder circuit, and the first bleeder circuit is electrically connected to the piezoelectric ceramic driving voltage interface. The second control terminal PWM2 of the Bluetooth communication and computing module is electrically connected to the control terminal of the second boost circuit, the second boost circuit is electrically connected to the second bleeder circuit, and the second bleeder circuit is electrically connected to the piezoelectric ceramic driving voltage interface.

[0065] The piezoelectric ceramic drive voltage interface is electrically connected to the pressure sensor, temperature sensor, and calibration data module, respectively.

[0066] Details are as follows:

[0067] The circuit consists of a liquid-electric switch module, a power supply voltage module, a Bluetooth communication and computing module, a piezoelectric ceramic drive module, a leakage detection module, a battery voltage detection module, an audible and visual alarm module, and an interface module. The interface module includes a piezoelectric ceramic drive voltage interface, a low-voltage power supply interface, a pressure sensor, a temperature sensor, and a signal interface for calibration data.

[0068] Description of each module:

[0069] 1. Electrohydraulic switch module:

[0070] Composition Description: The module consists of an external liquid circuit switch and a circuit power switch.

[0071] Part 1, External Liquid Circuit Switch: The external liquid circuit switch is a structural component. Specifically, it is implemented by moving or pressing the sealing plug fixing component between the external module and the liquid bag, causing the metal pipe at the liquid inlet end of the module to pierce the sealing plug of the liquid bag to achieve liquid circuit connection.

[0072] Part Two, Circuit Power Switch: The circuit power switch consists of at least one positive metal spring and one negative metal spring. Specifically, one metal spring is glued and fixed to the sealing plug fixture, connecting it to the circuit. The other metal spring is soldered and fixed to the circuit. By moving or pressing the sealing plug fixture, the two metal springs come into contact, thus connecting the circuit.

[0073] Working principle: The power switch and the external liquid circuit switch are integrated into one unit. The opening and closing of the switch are achieved through the external structure, and the circuit only needs to make two connection ports for connection. When the liquid-electric switch is turned on, the input terminal of the power supply voltage module circuit is connected to the main power supply of the system, and the output terminal of the power supply voltage module circuit is connected to the audible and visual alarm module, Bluetooth communication and computing module, piezoelectric ceramic drive module, and external modules.

[0074] Connections: The circuit input is connected to the battery, and the circuit output is connected to the power supply voltage module and the battery voltage detection module. It receives the input voltage value from the battery voltage detection module via Bluetooth communication and processing, thus feeding back its own status information to that module.

[0075] 2. Power supply voltage module:

[0076] Composition Description: The voltage power supply module consists of two parts. The first part provides a stable power supply voltage to the Bluetooth communication and computing module, circuit output, and external modules of the sound and light alarm module. The second part provides sufficient energy conversion voltage to the piezoelectric ceramic drive module.

[0077] The first part consists of a DC-DC power supply chip, an inductor, and two capacitors. The power supply chip is selected as XT1861, which is a low-power, high-efficiency, low-ripple, high-frequency PFM-controlled boost DC-DC converter.

[0078] Part Two: Part One consists of a DC-DC power supply chip, two inductors, two capacitors, and one resistor. The power supply chip is selected as XC9140, which is a boost synchronous DC / DC converter that can be controlled to turn on and off via Bluetooth communication and a computing module.

[0079] Functional Characteristics: The power supply voltage module is responsible for providing a stable, reliable power supply to the entire circuit system, adaptable to the needs of each module. This module has efficient power conversion and voltage regulation functions for the input power, and can output DC power at various voltage levels to meet the specific operating voltage requirements of the audible and visual alarm module, Bluetooth communication and computing module, piezoelectric ceramic driver module, and external modules.

[0080] Connection relationship: The circuit input is connected to the electrohydraulic switch module, and the circuit output is connected to the audible and visual alarm module, Bluetooth communication and computing module, piezoelectric ceramic drive module, pressure sensor, temperature sensor and calibration data module.

[0081] 3. Bluetooth communication and computing module:

[0082] Composition Description: The Bluetooth communication and computing module consists of a Bluetooth SoC, several resistors and capacitors, two crystal oscillators, and other peripheral circuits, as well as antenna-related circuits.

[0083] Part 1, Bluetooth SOC: The Bluetooth SOC selected is N32WB03, which adopts QFN32 package, has a small size of only 4.00x4.00mm and a height of 0.95mm for easy integration, supports Bluetooth BLE5.1 specification, has good RF performance, rich communication interfaces, and has multiple low power modes.

[0084] Part Two, Antenna-Related Circuits: The antenna-related circuits consist of a ceramic antenna, two inductors, and one capacitor.

[0085] Functional Features: The Bluetooth communication and computing module utilizes Bluetooth Low Energy SOC technology to achieve wireless data transmission with external smart devices, such as smartphones, tablets, or host computer control systems. It supports the Bluetooth communication protocol, providing stable communication connectivity, and processes data from various modules. It performs real-time analysis of hydraulic pressure data transmitted from external modules to determine if the system is in normal operating condition. Based on preset algorithms and logic, it generates control commands and sends them to the piezoelectric ceramic driver module to control the piezoelectric ceramic. Simultaneously, it transmits system status information, including hydraulic pressure, battery voltage, and leakage detection results, to external devices via Bluetooth communication for remote monitoring and management.

[0086] Connections: Connects to the power supply voltage module to receive a stable power supply voltage; connects to the pressure sensor, temperature sensor, and calibration data module via the I2C data bus to receive sensor data; connects to the piezoelectric ceramic drive module to adjust the drive parameters of the piezoelectric ceramic according to external device commands or internal calculation results; connects to the battery voltage detection module to acquire battery voltage information and trigger an audible and visual alarm when the voltage is abnormal; connects to the leakage detection module to receive leakage alarm signals and promptly notify external devices and trigger the audible and visual alarm module; connects to the audible and visual alarm module to control the triggering and stopping of alarm signals.

[0087] 4. Piezoelectric ceramic drive module:

[0088] Composition Description: The piezoelectric ceramic drive module consists of two boost circuits and two discharge circuits.

[0089] Part 1, Boost Circuit:

[0090] like Figure 2-1 As shown, the piezoelectric ceramic driver module circuit, the main components of the boost circuit include a current mirror driver chip TPS6139x, a freewheeling diode D1, a boost inductor L1, voltage divider resistors R1, R2, R3, and R4, and an output capacitor C1. The first boost circuit mainly uses the first boost chip U1, which is shown on the left side of the figure.

[0091] like Figure 2-2 As shown, the piezoelectric ceramic driver module circuit's boost circuit mainly consists of a current mirror driver chip TPS6139x, a freewheeling diode D3, a boost inductor L2, voltage divider resistors R6, R7, R8, and R9, and an output capacitor C2. The second boost circuit mainly uses a second boost chip U2; the chip on the left side of the figure is the second boost chip U2.

[0092] The first boost circuit and the second boost circuit have the same structure. The boost circuit mainly uses the boost chip TPS6139x. The boost chip and peripheral auxiliary circuits are existing technologies and will not be described in detail.

[0093] Part Two, Discharge Circuit:

[0094] like Figure 2-1 and Figure 2-2 As shown, the piezoelectric ceramic drive module circuit, the main components of the discharge circuit include diodes D2 and D4, transistors Q1 and Q2, resistors R3, R4, R5, R8, R9, R10, etc.

[0095] Work process:

[0096] The control signals PWM1 and PWM2 of the piezoelectric ceramic drive module are controlled by the Bluetooth communication and computing module.

[0097] When PWM1 / PWM2 is in the ON state, the chip's built-in PWM controller monitors the output voltages V1 and V2 through the ratio of feedback resistors R1, R2, R3, and R4, and compares them with an internal reference voltage. Based on the comparison result, the duty cycle of the built-in PWM signal controller is adjusted, i.e., the ratio of the on and off time of the switching transistors. When the output voltages V1 and V2 are lower than the set values, the duty cycle of the built-in PWM signal controller is increased, making the on time of the built-in switching transistors longer, and more energy is stored in inductors L1 and L2, thereby increasing the output voltage. Conversely, when the output voltages V1 and V2 are higher than the set values, the duty cycle is decreased, reducing the energy storage and energy transfer inductors L1 and L2, causing the output voltage to drop. This achieves precise regulation and stable output voltage. When PWM1 / PWM2 is off, the output voltage drops. However, due to the presence of capacitors C1 and C2 in the circuit, the output voltage cannot immediately drop to 0. Therefore, the residual current discharge circuit needs to work together. At the moment V1 and V2 are powered on, the bases (b) of transistors Q1 and Q2 are at a high level, and transistors Q1 and Q2 are cut off. V1 and V2 charge C1 and C2 through D2. At the moment V1 and V2 are powered off, the bases (b) of transistors Q1 and Q2 are pulled low by resistors R3 and R8. Due to their unidirectional conductivity, D2 and D4 are effectively disconnected, and current flows from the collector to the emitter of Q1 and Q2, ultimately forming a circuit.

[0098] Features: The boost circuit, designed with the TPS6139x boost chip, efficiently converts input electrical energy into a high-voltage pulse signal suitable for piezoelectric ceramic operation. It features precise voltage regulation and pulse width modulation, allowing for flexible adjustment of the piezoelectric ceramic's drive voltage and frequency to achieve precise vibration control according to different application requirements. A residual current discharge circuit can quickly reduce the drive voltage to 0V. When the piezoelectric ceramic needs to rapidly switch drive voltages, the output voltage can be quickly adjusted, reducing voltage rise and fall times.

[0099] Connections: The input terminal connects to the circuit output of the power supply voltage module to receive the operating power. It also connects to the Bluetooth communication and processing module to receive drive parameter adjustment commands, enabling dynamic control of the piezoelectric ceramic drive signal. The output terminal directly connects to the piezoelectric ceramic element of an external module, applying the drive signal to the piezoelectric ceramic to induce corresponding mechanical deformation or vibration.

[0100] 5. Leakage detection module:

[0101] Composition description:

[0102] like Figure 3 As shown, the leakage detection circuit consists of a detection resistor and the ADC detection pin of the Bluetooth SoC.

[0103] Working process: After the Bluetooth communication and computing module sends the detection command, the resistance detection circuit is turned on. The Bluetooth communication and computing module can receive the voltage obtained by the detection resistor. By combining Ohm's law, the resistance of the liquid in the medicine reservoir can be calculated. According to Table 1, it can be judged whether there is a leak between the medicine chamber and the hydraulic chamber of the medicine reservoir. If a leak occurs, the piezoelectric ceramic drive module stops working and sets up an audible and visual alarm. If there is no leak, it works normally.

[0104] Table 1: Relationship Table

[0105]

[0106] Functional Features: Real-time monitoring of the integrity of the liquid circuit system and detection of any liquid leaks. Utilizing a high-precision sampling resistor, it can sensitively sense changes in environmental parameters surrounding the liquid circuit. Upon detecting any signs of leakage, it immediately sends an alarm signal to the Bluetooth communication and processing module to enable emergency measures to be taken to prevent further damage from the leak.

[0107] Connection relationship: Connects to the Bluetooth communication and processing module to transmit detection data and alarm signals to the Bluetooth communication and processing module for centralized processing and remote notification.

[0108] 6. Battery voltage detection module:

[0109] Composition description: The battery voltage detection circuit consists of two high-precision voltage divider resistors R11 and R12, and one capacitor C3.

[0110] Work process:

[0111] like Figure 4 As shown, the battery voltage detection module continuously monitors the battery voltage BAT+. When the voltage of ADC_BAT after voltage division is lower than the set threshold, the Bluetooth communication and calculation module triggers the audible and visual alarm module to issue a low battery alarm.

[0112] Functional Features: Real-time monitoring and acquisition of the system's battery voltage. A high-precision voltage measurement circuit accurately obtains the current battery voltage value and transmits this data to the Bluetooth communication and processing module. The Bluetooth communication and processing module performs calculations based on the received voltage data, including calculating remaining battery power and providing low battery warnings, to ensure stable system operation when powered by battery.

[0113] Connection relationship: Connected to the Bluetooth communication and computing module, it will continuously transmit the detected battery voltage data to the Bluetooth communication and computing module.

[0114] 7. Audible and visual alarm module:

[0115] Composition description: The battery voltage detection circuit consists of a buzzer and a tri-color light.

[0116] Functional Features: Based on instructions from the Bluetooth communication and computing module, it emits intuitive audible and visual alarm signals to alert users or on-site operators to system malfunctions. Alarm signal types, such as sound frequency, volume, light color, and flashing frequency, can be differentiated and set according to different alarm events, enabling operators to quickly identify the cause of the alarm and take appropriate countermeasures. For example, it emits a low, continuous beep and flashing yellow light when the battery is low; and a sharp, intermittent beep and flashing red light when a leak detection alarm is triggered.

[0117] Connection relationship: Connects to the Bluetooth communication and computing module, receives alarm signals from the Bluetooth communication and computing module, and emits corresponding audible and visual signals according to the signal requirements.

[0118] Example 2:

[0119] Example 2 is an alternative to Example 1.

[0120] This utility model discloses a system for driving a piezoelectric ceramic pump, which includes a liquid-electric switch module, a power supply voltage module, a Bluetooth communication and computing module, a piezoelectric ceramic driving module, a leakage detection module, a battery voltage detection module, an audible and visual alarm module, and an interface module. The similarities will not be repeated.

[0121] The circuit for driving piezoelectric ceramics is not unique:

[0122] like Figure 5 As shown, this replaces the boost circuit in Example 1. The boost chip U3, the BOOST boost circuit, and the charge pump negative voltage conversion circuit are used. The boost circuit itself will not be described in detail. The principle of the charge pump negative voltage conversion circuit is that the voltage difference across the capacitor cannot change abruptly. When L3 outputs a high level, both ends of capacitor C9 are positively charged at the moment of power-on. Then, capacitor C9 begins to slowly charge, the freewheeling diode D6 conducts, and negative charge accumulates on the right side of capacitor C9, causing the voltage to gradually decrease. When L3 outputs a low level, the left side of capacitor C9 is 0V. The voltage difference across capacitor C9 cannot change abruptly, and the right side is the negative of the original voltage difference. The voltage on the left side of capacitor C9 minus the voltage on the right side of capacitor C9 equals the original voltage difference. Positive charge on capacitor C10 accumulates on the right side of capacitor C9 through the freewheeling diode D6, resulting in a negative voltage at the top of capacitor C10. This process is repeated, and after several cycles, the top of capacitor C9 can basically stabilize at Vout2.

Claims

1. A system for driving a piezoelectric ceramic pump, characterized in that: The system includes an electrohydraulic switch module, a power supply voltage module, a computational module with a communication unit, a piezoelectric ceramic drive module, a leakage detection module, a battery voltage detection module, an audible and visual alarm module, and an interface module. The interface module includes a piezoelectric ceramic drive voltage interface, a low-voltage power supply interface, a pressure sensor interface, a temperature sensor interface, and a calibration data signal interface. The electrohydraulic switch module is electrically connected to both the power supply voltage module and the battery voltage detection module. The first output terminal of the power supply voltage module is electrically connected to the computational module with communication unit, the leakage detection module, the audible and visual alarm module, the low-voltage power supply interface, the pressure sensor interface, the temperature sensor interface, and the calibration data signal interface. The second output terminal of the power supply voltage module is electrically connected to the piezoelectric ceramic drive module. The battery voltage detection module is electrically connected to the computational module with communication unit, and the leakage detection module is electrically connected to the computational module with communication unit. The computational module with communication unit is electrically connected to the audible and visual alarm module, the low-voltage power supply interface, the pressure sensor interface, the temperature sensor interface, and the calibration data signal interface. The control terminal of the computational module with communication unit is electrically connected to the control terminal of the piezoelectric ceramic drive module, and the piezoelectric ceramic drive module is electrically connected to the piezoelectric ceramic drive voltage interface.

2. The system for driving a piezoelectric ceramic pump according to claim 1, characterized in that: The piezoelectric ceramic driving module includes a first boost circuit, a second boost circuit, a first bleeder circuit, and a second bleeder circuit. The second output terminal of the power supply voltage module is electrically connected to the first boost circuit, and the second output terminal of the power supply voltage module is electrically connected to the second boost circuit. The first control terminal PWM1 of the computing module with communication unit is electrically connected to the control terminal of the first boost circuit. The first boost circuit is electrically connected to the first bleeder circuit, and the first bleeder circuit is electrically connected to the piezoelectric ceramic driving voltage interface. The second control terminal PWM2 of the computing module with communication unit is electrically connected to the control terminal of the second boost circuit. The second boost circuit is electrically connected to the second bleeder circuit, and the second bleeder circuit is electrically connected to the piezoelectric ceramic driving voltage interface.

3. The system for driving a piezoelectric ceramic pump according to claim 1, characterized in that: It also includes a leakage detection electrode, and the leakage detection module is electrically connected to the leakage detection electrode.

4. The system for driving a piezoelectric ceramic pump according to claim 1, characterized in that: It also includes a pressure sensor, a temperature sensor, and a calibration data module. The low-voltage power supply interface is electrically connected to the pressure sensor, the temperature sensor, and the calibration data module, respectively. The pressure sensor interface is electrically connected to the pressure sensor, the temperature sensor interface is electrically connected to the temperature sensor, the calibration data signal interface is electrically connected to the calibration data module, and the piezoelectric ceramic drive voltage interface is electrically connected to the pressure sensor, the temperature sensor, and the calibration data module, respectively.

5. The system for driving a piezoelectric ceramic pump according to claim 1, characterized in that: The computing module with a communication unit is a Bluetooth communication and computing module, and the communication unit is a Bluetooth communication unit.

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