Driving system and method of ultrasonic air pump

Abstract

The invention relates to the technical field of power electronic driving control, in particular to a driving system and method for an ultrasonic air pump, and the system comprises a control signal generation module which is used for generating a control signal; the voltage superposition driving module is coupled to the control signal generation module and is used for superposing and lifting the driving voltage according to the control signal and executing reversing operation, and the reversing operation comprises forward driving and reverse driving; the driving frequency adjusting module is coupled to the control signal generating module and is used for adjusting the driving frequency and speed of the ultrasonic air pump based on the control signal; and the working circuit protection module is coupled to the voltage superposition driving module and is used for setting dead time between forward driving and reverse driving to prevent short circuit. According to the invention, the dependence of the ultrasonic air pump on an independent high-voltage power supply and how to realize high-voltage alternating driving through voltage superposition and avoid the risk of bridge arm direct connection and resonance mismatch under the constraint of a low-voltage power supply are effectively solved.

Description

Technical Field

[0001] The present invention relates to the technical field of power electronic drive control, and in particular to a drive system and method for an ultrasonic air pump. Background Art

[0002] Ultrasonic air pumps, as fluid-driving devices that utilize the inverse piezoelectric effect of piezoelectric ceramics, rely on high-frequency alternating high voltage to generate mechanical vibrations to compress the gas. Currently, the industry generally uses a low-voltage power supply and a boost circuit drive architecture. This involves using a DC-DC converter to boost the low voltage from a battery or adapter to the target high voltage, which is then converted into an alternating signal via a bridge circuit to drive the ultrasonic air pump.

[0003] However, current existing technologies have drawbacks. First, the input voltage requirement is too high. The boost circuit itself requires high voltage excitation to work effectively, which makes ordinary low-voltage power supplies unusable and greatly limits the power supply adaptability range. Furthermore, the irreversible loss of energy efficiency and the energy loss generated in the voltage conversion link make the overall system efficiency low, which runs counter to the energy-saving goals pursued by low-voltage drive. The systems composed of existing technologies are often redundant and complex, and the boost module forces an increase in circuit layers, ignoring the essential need for miniaturization of low-voltage equipment. Therefore, how to free the ultrasonic air pump from its dependence on an independent high-voltage power supply and simultaneously achieve efficient drive, dynamic speed regulation, and system simplification with a single low-voltage circuit has become a difficult problem that current technologies need to overcome.

[0004] The information disclosed in this background technology section is only intended to deepen the understanding of the overall background technology of the present disclosure and should not be regarded as an admission or any form of suggestion that the information constitutes the prior art known to those skilled in the art. Summary of the Invention

[0005] The present invention provides a driving system and method for an ultrasonic air pump, which can effectively solve the problems in the background technology.

[0006] In order to achieve the above object, the technical solution adopted by the present invention is: A driving system for an ultrasonic air pump, comprising: A control signal generating module, used for generating a control signal; a voltage superposition driving module, coupled to the control signal generating module, for superimposing and increasing the driving voltage according to the control signal and performing a commutation operation, wherein the commutation operation includes forward driving and reverse driving; a driving frequency adjustment module, coupled to the control signal generation module, and adjusting the driving frequency and speed of the ultrasonic air pump based on the control signal; The working circuit protection module is coupled to the voltage superposition driving module and sets a dead time between the forward driving and the reverse driving to prevent short circuit.

[0007] Furthermore, the voltage superposition driving module includes a first boost path and a second boost path; The first boost path includes a first switch unit and a fourth switch unit, and the first boost path is operated by a low-voltage power supply to form the forward drive; The second boost path includes a second switch unit and a third switch unit. The second boost path is operated by the low-voltage power supply to form the reverse drive.

[0008] Furthermore, the first switch unit is connected to a first gate driver, and the fourth switch unit is connected to a second gate driver. When the first boost path is turned on, the first gate driver and the second gate driver respectively control the conduction of the first switch unit and the fourth switch unit based on the control signal. The second switch unit is connected to the first gate driver, and the third switch unit is connected to the second gate driver. When the second boost path is turned on, the first gate driver and the second gate driver respectively control the conduction of the second switch unit and the third switch unit based on the control signal.

[0009] Furthermore, during the conduction period of the first boost path, both ends of the ultrasonic air pump are subjected to the forward driving voltage of the low-voltage power supply; During the conduction period of the second boost path, both ends of the ultrasonic air pump are subjected to the reverse driving voltage of the low-voltage power supply; The first boost path and the second boost path are switched alternately, and the forward driving voltage and the reverse driving voltage are combined into an alternating high-voltage driving signal on the ultrasonic air pump through an alternating conduction timing.

[0010] Furthermore, the control signal generating module generates a first control signal and a second control signal when in operation to control the conduction of the first boost path and the second boost path respectively; When the first control signal is output at a high level and the second control signal is output at a low level, the first gate driver turns on the first switch unit and the second gate driver turns on the fourth switch unit, completing the conduction of the first boost path; When the second control signal is output at a high level, the first control signal is output at a low level. At this time, the second gate drives the third switch unit to be turned on, and the first gate drives the second switch unit to be turned on, completing the conduction of the second boost path.

[0011] Furthermore, the first control signal and the second control signal drive the ultrasonic air pump independently of each other; When the first control signal is at a high level and the second control signal is at a low level, the forward drive is formed and both ends of the ultrasonic air pump maintain a high level; When the second control signal is at a high level and the first control signal is at a low level, the reverse driving is formed, and both ends of the ultrasonic air pump maintain a high level; When the corresponding parts of the switching cycles of the first control signal and the second control signal are both low, the two ends of the ultrasonic air pump maintain a low level; When one of the first control signal and the second control signal is at a high level at the same time, both ends of the ultrasonic air pump maintain a high level; The waveforms at both ends of the ultrasonic air pump form a continuous alternating high-voltage drive signal during a switching period based on alternating high and low levels.

[0012] Furthermore, the driving frequency adjustment module dynamically adjusts the frequency of the signal pulse output by the control signal generation module based on the real-time detection of the phase difference between the working current and the driving voltage of the ultrasonic air pump so that the phase difference converges to a preset threshold range, and increases the duty cycle of the signal pulse to improve the driving speed when the phase difference is maintained within the threshold range.

[0013] Furthermore, the setting of the dead time is based on real-time monitoring of the junction temperature of the voltage superposition driving module, and dynamically calculating the dead time length according to the comparison result of the junction temperature and the preset temperature threshold, and controlling the control signal generation module to insert the dead time into the output control signal.

[0014] A method for driving an ultrasonic air pump, the method comprising: Generate two independent control signals based on control requirements to drive the forward boost path and the reverse boost path of the ultrasonic air pump respectively; Alternatingly conducting the forward boost path and the reverse boost path based on the control signal, superimposing an alternating high-voltage drive signal at both ends of the ultrasonic air pump; Real-time detection of the phase difference between the working current and the driving voltage of the ultrasonic air pump, and dynamic adjustment of the pulse frequency of the control signal so that the phase difference converges to a preset threshold range; When the phase difference is stable within a threshold range, increasing the pulse duty cycle of the control signal to increase the airflow output speed; The junction temperature is monitored in real time, the dead time length is dynamically calculated according to the comparison result between the junction temperature and the temperature threshold, and the dead time is inserted into the control signal to isolate the switching process of the forward boost path and the reverse boost path.

[0015] The technical solution of the present invention can achieve the following technical effects: It effectively solves the ultrasonic air pump's dependence on an independent high-voltage power supply and how to achieve high-voltage alternating drive through voltage superposition under the constraint of a low-voltage power supply and avoid the risks of bridge arm direct-through and resonance mismatch.

[0016] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0018] Figure 1 This is a topological diagram of a driving system of an ultrasonic air pump; Figure 2 It is a structural diagram of the voltage superposition drive module; Figure 3 Schematic diagram of the conduction topology of the first boost path; Figure 4 Schematic diagram of the conduction topology of the second boost path; Figure 5 is a waveform diagram of the first control signal and the second control signal; Figure 6 Schematic diagram of the combined waveform of the first control signal and the second control signal. DETAILED DESCRIPTION

[0019] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0020] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this invention pertains. The terms used in this specification are for the purpose of describing specific embodiments only and are not intended to limit the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0021] Embodiment 1; like Figure 1 As shown, the present application provides a driving system for an ultrasonic air pump, the system comprising: A control signal generating module, used for generating a control signal; A voltage superposition driving module is coupled to the control signal generating module, and increases the driving voltage and performs commutation operations according to the control signal superposition. The commutation operations include forward driving and reverse driving. A driving frequency adjustment module, coupled to the control signal generation module, adjusts the driving frequency and speed of the ultrasonic air pump based on the control signal; The working circuit protection module is coupled to the voltage superposition driving module and sets a dead time between the forward driving and the reverse driving to prevent short circuit.

[0022] Specifically, first, the control signal generating module is the core driving unit of the entire system. Its preferred implementation method is to use a microcontroller unit, namely MCU, to generate precise PWM signals. The PWM signals are used to control the voltage superposition driving module and the driving frequency adjustment module. Specifically, these control signals achieve precise control of the operation of the ultrasonic air pump by adjusting the duty cycle and frequency; the voltage superposition driving module performs boosting and switching operations by receiving signals from the control signal generating module. The boosting function is achieved through a bridge circuit, in which each switching unit is alternately turned on according to the control signal, thereby achieving forward drive and reverse drive. In a preferred embodiment, the design of the voltage superposition module can generate voltages from two opposite paths under lower input voltage conditions. The superposition increases the output voltage, ensuring the efficient operation of the ultrasonic air pump; the driving frequency adjustment module is coupled with the control signal generation module and is adjusted according to the input control signal. This adjustment not only optimizes power consumption, but also dynamically adjusts the driving frequency and speed of the ultrasonic air pump according to different operating requirements. Through precise frequency control, the performance of the air pump can be improved and its service life can be extended; the preferred implementation method of the working circuit protection module includes setting a dead time between forward drive and reverse drive. Specifically, the dead time setting ensures that there is sufficient time between switching from one drive mode to another by fine-tuning the timing of the gate driver, avoiding direct conduction of each switching unit, thereby greatly reducing the risk of damage caused by short circuit.

[0023] The technical solution of the present invention effectively solves the dependence of the ultrasonic air pump on an independent high-voltage power supply and how to achieve high-voltage alternating drive through voltage superposition under the constraint of a low-voltage power supply and avoid the risks of bridge arm direct-through and resonance mismatch.

[0024] Further, if Figure 2 As shown, the voltage superposition driving module includes a first boost path and a second boost path; The first boost path includes a first switch unit and a fourth switch unit, and the first boost path is driven in a forward direction by a low-voltage power supply. The second boost path includes a second switch unit and a third switch unit. The second boost path is operated by a low-voltage power supply to form a reverse drive.

[0025] As a preferred embodiment of the above, the voltage superposition driving module includes a first boost path and a second boost path, which are respectively responsible for forming forward and reverse drives, thereby achieving a voltage superposition effect; the first boost path is constructed between the first switch unit and the fourth switch unit, and is powered by a low-voltage power supply. The first switch unit is turned on, so that the current flows into the ultrasonic air pump through the path, and then flows out through the fourth switch unit, thereby forming a complete forward current path; at the same time, the second boost path is established between the second switch unit and the third switch unit, and the reverse drive is achieved by turning on the second switch unit, so that the current flows through the air pump and the third switch unit in the opposite direction, forming a second current path. Similarly, this also depends on the power supply of the low-voltage power supply. In the preferred implementation method, the boost path The switching of the paths is accomplished through the rapid response and switching of the control signal, which ensures that the current conversion between the two paths is seamless, achieving a voltage superposition effect; for example, in the first boost path, by appropriately adjusting the conduction timing of the first and fourth switch units, the voltage in the system is converted from a low voltage to a higher voltage that can meet the driving needs of the ultrasonic air pump. In this state, the operation of the ultrasonic air pump is continuous and stable. In the second boost path, in a completely similar manner, the second and third switch units provide reverse current through the reverse conduction path, so that the voltage continues to increase and output stably. The design of the overall system not only optimizes the efficient utilization of the power supply, but also improves the driving voltage through the voltage superposition strategy, providing sufficient power guarantee for the ultrasonic air pump.

[0026] Further, if Figure 3 and Figure 4 As shown, the first switch unit is connected to the first gate driver, and the fourth switch unit is connected to the second gate driver. When the first boost path is turned on, the first gate driver and the second gate driver respectively control the conduction of the first switch unit and the fourth switch unit based on the control signal; The second switch unit is connected to the first gate driver, and the third switch unit is connected to the second gate driver. When the second boost path is turned on, the first gate driver and the second gate driver respectively control the conduction of the second switch unit and the third switch unit based on the control signal.

[0027] As a preferred embodiment of the above, the first boost path includes a first switch unit and a fourth switch unit. When working in this path, the first gate drive and the second gate drive are respectively connected to the first and fourth switch units. The first gate drive receives a signal from the control signal generation module and accurately modulates the conduction state of the first switch unit to ensure that the current flows smoothly through the predetermined path. At the same time, the second gate drive controls the fourth switch unit to make it synchronous with the first switch unit or turn on according to a predetermined timing to form a complete current loop. This configuration not only realizes the positive drive of the current, but also effectively improves the output voltage. Similarly, in the second boost path, the second switch unit and the third switch unit are activated by the second path. At this time, the first gate drive controls the conduction of the second switch unit, and the second gate drive controls the conduction of the second switch unit. The third switching unit is controlled by the gate driver. The key to this strategy lies in the coordinated work of the two gate drivers. By responding to the control signal generated by the MCU, synchronous or alternating switching is achieved, so that the current flows in the opposite direction in the path, and reverse driving is achieved with the corresponding current. This not only ensures the stability of the voltage boost, but also ensures a seamless transition between different paths. For example, if frequent positive and negative alternating operations are required in the application, through the above-mentioned gate drive configuration, the control signal can dynamically adjust the operation smoothness of each switching unit. In the specific implementation, the gate driver is designed to be able to process high-frequency signals. Whether at the startup moment or during operation, it can immediately respond to signal changes, which not only improves the overall response speed of the system, but also reduces switching losses and improves the durability and reliability of the system.

[0028] Furthermore, during the conduction period of the first boost path, both ends of the ultrasonic air pump are subjected to the forward driving voltage of the low-voltage power supply; During the conduction period of the second boost path, both ends of the ultrasonic air pump are subjected to the reverse driving voltage of the low-voltage power supply; The first boost path and the second boost path are switched alternately, and the forward driving voltage and the reverse driving voltage are synthesized into an alternating high-voltage driving signal on the ultrasonic air pump through an alternate conduction timing.

[0029] As a preferred embodiment of the above, the forward and reverse driving voltages are generated by alternating conduction of the two boost paths in the voltage superposition driving module; during the conduction period of the first boost path, the first and fourth switch units are turned on, and a forward driving voltage is generated by the low-voltage power supply, which acts on both ends of the air pump; in this stage, the current flows through the ultrasonic air pump to ensure that the ultrasonic air pump is in a stable working state; as the system demand changes or the control signal instructs, the drive system switches to the second boost path, and the second switch unit and the third switch unit are turned on at this stage, so that the low-voltage power supply forms a reverse driving voltage, which acts on both ends of the ultrasonic air pump again to realize the reverse operation of the air pump; the voltage alternation effect is accurately achieved through alternating switching and timing control, and the key lies in the alternating process The time management in the circuit ensures that the positive and negative driving voltages can be accurately synthesized into a complete driving signal; in the preferred embodiment, the alternating switching is controlled by the MCU, and the conduction time of each path can be fine-tuned through the built-in time management system. In this way, during the adjustment and switching process, the forward voltage and the reverse voltage have been proven to be able to achieve a smooth transition, and the stability of the system can be maintained both during the startup of the air pump and during efficient continuous operation. This not only makes the operation of the ultrasonic air pump more efficient, but also greatly reduces energy loss and optimizes the use and management of the overall power supply; for example, in precision industrial equipment, the alternating high-voltage drive signal can provide precise airflow control, so that the equipment can still maintain precise control when faced with complex tasks.

[0030] Further, if Figure 5 As shown, the control signal generating module generates a first control signal and a second control signal when in operation to control the conduction of the first boost path and the second boost path respectively; When the first control signal is output at a high level, the second control signal is output at a low level. At this time, the first gate drives the first switch unit to be turned on, and the second gate drives the fourth switch unit to be turned on, thereby completing the conduction of the first boost path. When the second control signal is output at a high level, the first control signal is output at a low level. At this time, the second gate drives the third switch unit to be turned on, and the first gate drives the second switch unit to be turned on, completing the conduction of the second boost path.

[0031] As a preferred embodiment of the above embodiment, the control signal generation module simultaneously generates a first control signal and a second control signal when working, wherein each signal corresponds to the operation logic of a boost path; in a preferred embodiment, when the first control signal is high, the second control signal turns low, timely triggering the conduction of the first boost path, at this time, the first gate driver receives the high-level signal and activates the first switch unit, and the second gate driver also responds to the high-level signal to turn on the fourth switch unit, so that the current smoothly passes through the preset current path to reach the two ends of the ultrasonic air pump, realizing forward drive; when it is necessary to switch to the second boost path, the control signal generation module converts the signal state, that is, sets the second control signal to a high level, and the first control signal turns to a low level output. At this stage, the second gate driver receives the high-level instruction and actively drives the third switch unit. At the same time, the first gate driver is responsible for turning on the second switch unit, forming an effective reverse current flow in the second boost path, thereby realizing reverse drive at both ends of the air pump; for example, this signal control mechanism is particularly suitable for air pumps that need to be frequently started and adjusted in working state. The control signal generation module can realize seamless switching between the two working paths of the air pump through signal conversion and adjustment.

[0032] Further, if Figure 6 As shown, the first control signal and the second control signal drive the ultrasonic air pump independently of each other; When the first control signal is at a high level and the second control signal is at a low level, a forward drive is formed and both ends of the ultrasonic air pump maintain a high level; When the second control signal is at a high level and the first control signal is at a low level, reverse driving is formed, and both ends of the ultrasonic air pump maintain a high level; When the corresponding parts of the switching cycles of the first control signal and the second control signal are both low, the two ends of the ultrasonic air pump maintain a low level; When one of the first control signal and the second control signal is at a high level at the same time, both ends of the ultrasonic air pump maintain a high level; The waveform at both ends of the ultrasonic air pump forms a continuous alternating high-voltage drive signal during the switching cycle based on the alternating high and low levels.

[0033] As a preferred embodiment of the above, the system generates two independent control signals to alternately operate to form a stable waveform at the air pump end; the first control signal and the second control signal realize alternating driving of the air pump through the dynamic changes of their high and low levels. When the first control signal is at a high level and the second control signal is at a low level, the system maintains a high level at both ends of the air pump through forward driving. At this time, the current flow forms a stable forward working waveform, providing the required driving voltage for the air pump; on the other hand, when reverse driving is required, the second control signal switches to a high level and the first control signal drops to a low level, so that both ends of the air pump still maintain a high level state, even if the signals are interchanged, the drive The continuity of the movement enables the air pump to maintain a stable working state during the conversion period. Furthermore, if the switching cycles of the two control signals are in the low-level part at the same time, the two ends of the air pump maintain a low level, so that the system enters the standby or low-power mode in the absence of a driving voltage; when any signal is at a high level, both ends of the air pump can always obtain high-level support, ensuring the continuity and stability of the alternating waveform, and realizing efficient driving of the air pump with alternating high and low levels; alternating drive can not only save energy, but also extend the life of the ultrasonic air pump and reduce mechanical fatigue. The preferred implementation scheme ensures the transition of the system in different working modes, thereby realizing efficient alternating high-voltage driving signals.

[0034] Furthermore, the driving frequency adjustment module dynamically adjusts the frequency of the signal pulse output by the control signal generation module based on the real-time detection of the phase difference between the working current and the driving voltage of the ultrasonic air pump so that the phase difference converges to a preset threshold range, and increases the duty cycle of the signal pulse to improve the driving speed when the phase difference remains within the threshold range.

[0035] As a preferred embodiment of the above embodiment, the driving frequency adjustment module first detects the working current and driving voltage of the air pump in real time through sensors, and uses the collected data to analyze its phase difference. The phase difference is a quantitative indicator of the synchronization between the system response and the power demand. In order to make the ultrasonic air pump operate in the best state, the phase difference needs to be adjusted to a preset threshold range; when it is detected that the phase difference deviates from the preset range, the driving frequency adjustment module immediately adjusts the frequency of the output signal of the control signal generation module so as to gradually converge the phase difference to the ideal target; this process is completed through an automatic feedback mechanism to ensure that the entire system can continuously correct its own operation to maintain efficiency and stability; when the phase difference is adjusted to within the preset threshold range, it indicates that the current and voltage of the air pump have been coordinated, and the drive system enters the optimization stage. At this time, the driving frequency adjustment module increases the duty cycle of the control signal pulse to increase the driving speed of the air pump. The increased duty cycle means that a higher average voltage can be applied, thereby improving the efficiency and output power of the air pump.

[0036] Furthermore, the dead time is set based on real-time monitoring of the junction temperature of the voltage superposition driver module, and the dead time length is dynamically calculated according to the comparison result between the junction temperature and the preset temperature threshold, and the control signal generation module is controlled to insert the dead time into the output control signal.

[0037] As a preferred embodiment of the above, the safety and efficiency of the system are optimized by dynamically adjusting the dead time, especially during the operation of the voltage superposition drive module. Specifically, a real-time temperature monitoring device is installed in the system to directly monitor the junction temperature changes within the module. The junction temperature refers to the operating temperature inside the semiconductor device. In a preferred embodiment, the temperature sensor continuously monitors the junction temperature of the voltage superposition drive module and transmits real-time data to the control signal generation module for comparing the junction temperature with a preset safety temperature threshold. When the junction temperature approaches or exceeds the safety threshold, the system immediately responds by adjusting the dead time in the control signal. The dead time refers to the time interval between the alternating conduction of two switching units to avoid the simultaneous conduction of two opposite switches. Specifically, as the junction temperature increases, the dead time is dynamically calculated to be appropriately extended to provide sufficient time for system components to dissipate heat and reduce the risk of short circuit caused by overheating. Conversely, if the junction temperature is lower than or stabilizes below the threshold, the dead time may be appropriately shortened to improve the response speed and efficiency of the system.

[0038] Embodiment 2; Based on the same inventive concept as the driving system of an ultrasonic air pump in the aforementioned embodiment, the present invention further provides a driving method of an ultrasonic air pump, the method comprising: Generate two independent control signals based on control requirements to drive the forward boost path and the reverse boost path of the ultrasonic air pump respectively; Alternatingly conducting the forward boost path and the reverse boost path based on the control signal, superimposing an alternating high-voltage drive signal at both ends of the ultrasonic air pump; Real-time detection of the phase difference between the working current and the driving voltage of the ultrasonic air pump, and dynamic adjustment of the pulse frequency of the control signal so that the phase difference converges to a preset threshold range; When the phase difference is stable within a threshold range, increasing the pulse duty cycle of the control signal to increase the airflow output speed; The junction temperature is monitored in real time, the dead time length is dynamically calculated according to the comparison result between the junction temperature and the temperature threshold, and the dead time is inserted into the control signal to isolate the switching process of the forward boost path and the reverse boost path.

[0039] The above adjustment method in the present invention can effectively realize a driving system of an ultrasonic air pump, and the technical effects that can be achieved are as described in the above embodiments and will not be repeated here.

[0040] Although the present application has been described with reference to specific features and embodiments thereof, it is apparent that various modifications and combinations may be made thereto without departing from the spirit and scope of the present application. Accordingly, this specification and drawings are merely illustrative of the present application as defined herein and are deemed to cover any and all modifications, variations, combinations or equivalents within the scope of the present application. Obviously, those skilled in the art may make various modifications and variations to the present application without departing from the scope of the present application. Thus, the present application is intended to include such modifications and variations as fall within the scope of the present application and its equivalents.

Claims

1. A driving system for an ultrasonic air pump, characterized in that: The system comprises: A control signal generating module, used for generating a control signal; a voltage superposition driving module, coupled to the control signal generating module, for superimposing and increasing the driving voltage according to the control signal and performing a commutation operation, wherein the commutation operation includes forward driving and reverse driving; a driving frequency adjustment module, coupled to the control signal generation module, and adjusting the driving frequency and speed of the ultrasonic air pump based on the control signal; The working circuit protection module is coupled to the voltage superposition driving module and sets a dead time between the forward driving and the reverse driving to prevent short circuit.

2. The driving system of the ultrasonic air pump according to claim 1, characterized in that: The voltage superposition driving module includes a first boost path and a second boost path; The first boost path includes a first switch unit and a fourth switch unit, and the first boost path is operated by a low-voltage power supply to form the forward drive; The second boost path includes a second switch unit and a third switch unit. The second boost path is operated by the low-voltage power supply to form the reverse drive.

3. The driving system of the ultrasonic air pump according to claim 2, characterized in that: The first switch unit is connected to a first gate driver, and the fourth switch unit is connected to a second gate driver. When the first boost path is turned on, the first gate driver and the second gate driver respectively control the conduction of the first switch unit and the fourth switch unit based on the control signal; The second switch unit is connected to the first gate driver, and the third switch unit is connected to the second gate driver. When the second boost path is turned on, the first gate driver and the second gate driver respectively control the conduction of the second switch unit and the third switch unit based on the control signal.

4. The driving system of the ultrasonic air pump according to claim 3, characterized in that: During the conduction period of the first boost path, both ends of the ultrasonic air pump are subjected to the forward driving voltage of the low-voltage power supply; During the conduction period of the second boost path, both ends of the ultrasonic air pump are subjected to the reverse driving voltage of the low-voltage power supply; The first boost path and the second boost path are switched alternately, and the forward driving voltage and the reverse driving voltage are combined into an alternating high-voltage driving signal on the ultrasonic air pump through an alternating conduction timing.

5. The driving system of the ultrasonic air pump according to claim 3, characterized in that: The control signal generating module generates a first control signal and a second control signal when in operation to control the conduction of the first boost path and the second boost path respectively; When the first control signal is output at a high level and the second control signal is output at a low level, the first gate driver turns on the first switch unit and the second gate driver turns on the fourth switch unit, completing the conduction of the first boost path; When the second control signal is output at a high level, the first control signal is output at a low level. At this time, the second gate drives the third switch unit to be turned on, and the first gate drives the second switch unit to be turned on, completing the conduction of the second boost path.

6. The driving system of the ultrasonic air pump according to claim 5, characterized in that: The first control signal and the second control signal drive the ultrasonic air pump independently of each other; When the first control signal is at a high level and the second control signal is at a low level, the forward drive is formed and both ends of the ultrasonic air pump maintain a high level; When the second control signal is at a high level and the first control signal is at a low level, the reverse driving is formed, and both ends of the ultrasonic air pump maintain a high level; When the corresponding parts of the switching cycles of the first control signal and the second control signal are both low, the two ends of the ultrasonic air pump maintain a low level; When one of the first control signal and the second control signal is at a high level at the same time, both ends of the ultrasonic air pump maintain a high level; The waveforms at both ends of the ultrasonic air pump form a continuous alternating high-voltage drive signal during a switching period based on alternating high and low levels.

7. The driving system of the ultrasonic air pump according to claim 1, characterized in that: The driving frequency adjustment module dynamically adjusts the frequency of the signal pulse output by the control signal generation module based on the real-time detection of the phase difference between the working current and the driving voltage of the ultrasonic air pump so that the phase difference converges to a preset threshold range, and increases the duty cycle of the signal pulse to improve the driving speed when the phase difference is maintained within the threshold range.

8. The driving system of the ultrasonic air pump according to claim 1, characterized in that: The dead time is set based on real-time monitoring of the junction temperature of the voltage superposition driving module, and dynamically calculating the dead time length according to the comparison result of the junction temperature and the preset temperature threshold, and controlling the control signal generation module to insert the dead time into the output control signal.

9. A method for driving an ultrasonic air pump, characterized in that: The method comprises: Generate two independent control signals based on control requirements to drive the forward boost path and the reverse boost path of the ultrasonic air pump respectively; Alternatingly conducting the forward boost path and the reverse boost path based on the control signal, superimposing an alternating high-voltage drive signal at both ends of the ultrasonic air pump; Real-time detection of the phase difference between the working current and the driving voltage of the ultrasonic air pump, and dynamic adjustment of the pulse frequency of the control signal so that the phase difference converges to a preset threshold range; When the phase difference is stable within a threshold range, increasing the pulse duty cycle of the control signal to increase the airflow output speed; The junction temperature is monitored in real time, the dead time length is dynamically calculated according to the comparison result between the junction temperature and the temperature threshold, and the dead time is inserted into the control signal to isolate the switching process of the forward boost path and the reverse boost path.

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