Ultrasonic dental scaler control circuit

Abstract

The utility model discloses a control circuit of an ultrasonic dental scaler, relates to the technical field of ultrasonic dental cleaning, and aims to solve the technical problems that the current control circuit of the ultrasonic dental scaler is insufficient in frequency regulation precision, unreasonable in power amplification and lack of effective monitoring feedback. Comprising a single-chip microcomputer used for receiving an instruction input by a user and generating a corresponding control signal to coordinate the working state of each module, an ultrasonic signal generator used for generating an adjustable square wave signal, a transducer, a power amplification circuit used for carrying out power amplification on the square wave signal, and a feedback adjustment module used for monitoring the working current of the transducer in real time, according to the utility model, the ultrasonic signal frequency can be accurately adjusted, the power can be efficiently amplified, the working current of the transducer can be monitored in real time, the cleaning effect can be improved, the energy utilization can be optimized, the stable operation of the transducer can be ensured, and the service life of the transducer can be prolonged.

Description

Technical Field

[0001] This utility model relates to the field of ultrasonic teeth cleaning technology, and more specifically, to a control circuit for an ultrasonic teeth cleaning device. Background Technology

[0002] In the field of oral hygiene, ultrasonic scalers have received widespread attention due to their effectiveness in cleaning plaque and tartar. However, existing ultrasonic scaler control circuits have many problems.

[0003] On the one hand, the frequency adjustment precision of the ultrasonic signals it generates is insufficient, making it difficult to accurately match different oral cleaning needs and the optimal working state of the transducer, resulting in inconsistent cleaning effects. When faced with tartar of varying thicknesses, it cannot flexibly adjust the ultrasonic frequency, affecting cleaning efficiency.

[0004] On the other hand, the power amplification stage is not designed properly, resulting in low energy conversion efficiency and high signal transmission loss. This not only wastes energy but also limits the battery life of the dental flosser, causing inconvenience to users due to frequent charging.

[0005] Furthermore, the lack of an effective monitoring and feedback adjustment mechanism for the transducer's operating status means that if the transducer deviates from its resonant point during operation, the cleaning effect will decrease, and it may even damage the transducer and shorten the service life of the dental scaler.

[0006] In summary, these issues limit the performance improvement and user experience of ultrasonic scalers, necessitating a more optimized control circuit to address these technical challenges. Therefore, we propose a control circuit for an ultrasonic scaler. Utility Model Content

[0007] The purpose of this invention is to overcome the shortcomings of the existing technology, adapt to practical needs, and provide an ultrasonic dental cleaner control circuit to solve the technical problems of insufficient frequency adjustment accuracy, unreasonable power amplification, and lack of effective monitoring feedback in the current ultrasonic dental cleaner control circuits.

[0008] To solve the above-mentioned technical problems, this utility model provides the following technical solution: an ultrasonic dental scaler control circuit, including a microcontroller for receiving user input commands and generating corresponding control signals to coordinate the working state of each module, an ultrasonic signal generator for generating adjustable square wave signals, a transducer, a power amplifier circuit for amplifying the square wave signals, a feedback adjustment module for real-time monitoring of the transducer's operating current, a power management module, a display module for displaying current information, and a key input module;

[0009] The microcontroller is electrically connected to the ultrasonic signal generator, power amplifier circuit, feedback adjustment module and power management module. The feedback adjustment module is electrically connected to the transducer to track the resonant point of the transducer. The display module is electrically connected to the microcontroller. The key input module is electrically connected to the microcontroller.

[0010] The ultrasonic signal generator includes a signal generation circuit for converting the pulse width modulation signal output by the microcontroller into an adjustable square wave signal with a frequency of 38kHz.

[0011] The power amplifier circuit includes a MOSFET driving circuit for receiving square wave signals to drive MOSFETs to perform high-frequency switching, a boost transformer for boosting low-voltage square wave signals to high-voltage signals, and a matching circuit for impedance matching of the boosted signals.

[0012] Preferably, the ultrasonic signal generator is based on microcontroller pulse width modulation technology, and the generated adjustable square wave signal has a frequency of 38kHz and a frequency resolution of less than or equal to 100Hz.

[0013] Preferably, the power amplifier circuit is electrically connected to both the ultrasonic signal generator and the transducer, and the power amplifier circuit employs MOS boost and MOSFET driving technology.

[0014] Preferably, the power management module is electrically connected to the microcontroller, the ultrasonic signal generator, the power amplifier circuit, and the feedback adjustment module. The power management module includes several sets of 3.7V lithium batteries as power supplies and a charging chip for managing the charging of the lithium batteries.

[0015] Preferably, the microcontroller has a pre-stored control parameter table for generating control signals according to user instructions to adjust the frequency and power amplification factor of the square wave signal, and the control parameter table corresponds to different intensity levels and working modes.

[0016] Preferably, the MOSFET driving circuit uses a high-speed, low-power driving chip, and the rise time and fall time of the output signal of the driving chip are both less than 100ns.

[0017] Preferably, the current detection function of the feedback regulation module is implemented through a sampling resistor, which is connected in series in the working circuit of the transducer.

[0018] Preferably, the display module is one or a combination of LED display and LCD display.

[0019] Compared with the prior art, the beneficial effects of this utility model are:

[0020] 1. This utility model, through its design comprising a microcontroller, an ultrasonic signal generator, a power amplifier circuit, and a feedback adjustment module, solves the problems of insufficient ultrasonic signal frequency adjustment accuracy, unreasonable power amplification, and lack of effective monitoring and feedback of the transducer in existing technologies. The ultrasonic signal generator, based on microcontroller pulse width modulation technology, generates an adjustable square wave signal with a frequency of 38kHz and a frequency resolution of less than or equal to 100Hz, which can accurately match different oral cleaning scenarios and transducer operating requirements, improving cleaning effect. The power amplifier circuit adopts MOS boost and MOSFET driving technology to achieve efficient power amplification and stable signal transmission, reducing energy loss and improving energy utilization. The feedback adjustment module monitors the transducer operating current in real time through a sampling resistor, enabling tracking of the transducer's resonant point, ensuring the transducer is always in optimal working condition, and extending its service life.

[0021] 2. The microcontroller in this utility model has a pre-stored control parameter table corresponding to different intensity levels and working modes. When it receives a user command, it can quickly and accurately retrieve the parameters to generate a control signal, adjust the square wave signal frequency and power amplification factor, further optimize the performance of the ultrasonic dental cleaner in different cleaning scenarios, improve cleaning efficiency and effect, simplify the user operation process, and enhance the ease of use of the product.

[0022] 3. The power management module in this utility model uses a charging chip with overvoltage, undervoltage, short circuit, overcharge, over-discharge and overheat protection functions to manage the 3.7V lithium battery. On the basis of ensuring the safe and stable operation of the battery, it further improves the stability and reliability of the entire circuit system, reduces failures caused by battery problems, and extends the overall service life of the dental flosser. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the structure of this utility model;

[0024] Figure 2 This is the circuit diagram of this utility model. Detailed Implementation

[0025] like Figure 1 As shown, the present invention relates to an ultrasonic dental scaler control circuit, which includes a microcontroller, an ultrasonic signal generator, a power amplifier circuit, a feedback adjustment module, a power management module, a display module, and a key input module.

[0026] The microcontroller serves as the control core and is electrically connected to the ultrasonic signal generator, power amplifier circuit, feedback adjustment module, and power management module. It is configured to receive user input commands such as intensity level and working mode, and generate corresponding control signals based on the commands to coordinate the working status of each module.

[0027] The ultrasonic signal generator is electrically connected to a microcontroller. Based on the microcontroller's pulse width modulation technology, it generates an adjustable square wave signal with a frequency of 38kHz according to the control signal issued by the microcontroller, with a frequency resolution of less than or equal to 100Hz.

[0028] The power amplifier circuit is electrically connected to both the ultrasonic signal generator and the transducer. It uses MOS boost technology to amplify the square wave signal generated by the ultrasonic signal generator so that the amplified signal power matches the impedance of the transducer. MOSFET drive is used to ensure stability in high-frequency switching mode.

[0029] The feedback adjustment module is electrically connected to both the transducer and the microcontroller, and has a current detection function. It monitors the operating current of the transducer in real time through a current-to-voltage conversion circuit and feeds back the voltage signal representing the operating current to the microcontroller. The microcontroller calculates the change in the load impedance of the transducer based on the feedback signal and dynamically adjusts the control signal output to the ultrasonic signal generator to achieve tracking of the transducer's resonant point.

[0030] The power management module is electrically connected to the microcontroller, ultrasonic signal generator, power amplifier circuit and feedback adjustment module. It uses several groups of 3.7V lithium batteries as power supply and adopts a dedicated charging chip to manage the charging of the lithium batteries. The dedicated charging chip has overvoltage protection, undervoltage protection and short circuit protection functions.

[0031] In an embodiment of this utility model, the microcontroller has a pre-stored control parameter table corresponding to different intensity levels and working modes. When it receives the intensity level and working mode command input by the user, it retrieves the corresponding parameters from the control parameter table, generates a control signal and sends it to the ultrasonic signal generator and power amplifier circuit to adjust the frequency and power amplification factor of the square wave signal.

[0032] In an embodiment of this utility model, the ultrasonic signal generator includes a signal generation circuit that receives control signals from a microcontroller and adjusts the frequency of the pulse width modulation signal by changing the setting parameters of a timer. The signal generation circuit converts the pulse width modulation signal output by the microcontroller into an adjustable square wave signal with a frequency of 38kHz.

[0033] In an embodiment of this utility model, the power amplifier circuit includes a MOSFET driving circuit, a boost transformer, and a matching circuit; the MOSFET driving circuit receives a square wave signal generated by an ultrasonic signal generator and drives the MOSFET to perform high-frequency switching; the boost transformer boosts the low-voltage square wave signal to a high-voltage signal; the matching circuit performs impedance matching on the boosted signal so that the signal power can be efficiently transmitted to the transducer.

[0034] In the embodiments of this utility model, the MOSFET driving circuit uses a high-speed, low-power driving chip. The rise time and fall time of the output signal of the driving chip are both less than 100ns, so as to ensure the fast response and stability of the MOSFET in high-frequency switching state.

[0035] In an embodiment of this utility model, the current detection function of the feedback adjustment module is realized through a sampling resistor. The sampling resistor is connected in series in the working circuit of the transducer. By detecting the voltage drop across the sampling resistor, the working current of the transducer is calculated using Ohm's law, and then the current signal is converted into a voltage signal and fed back to the microcontroller.

[0036] In embodiments of this utility model, the dedicated charging chip of the power management module also has overcharge protection, over-discharge protection and overheat protection functions; during the charging process, when the voltage of the lithium battery reaches the overcharge protection threshold, the dedicated charging chip automatically cuts off the charging circuit; when the voltage of the lithium battery is lower than the over-discharge protection threshold, the battery is prohibited from continuing to discharge; when the chip temperature exceeds the overheat protection threshold during the charging process, the charging current is reduced or charging is stopped.

[0037] In an embodiment of this utility model, the display module is electrically connected to a microcontroller. The microcontroller controls the display module to display information such as the current intensity level, working mode, and battery level according to the user's input instructions and the working status of each module.

[0038] In embodiments of this utility model, the display module is an LED display screen or an LCD display screen, which can intuitively display relevant information in the form of numbers, icons, or text.

[0039] In an embodiment of this utility model, the button input module is electrically connected to a microcontroller, and the user inputs commands such as intensity level and working mode to the microcontroller by operating the button input module.

[0040] Working Principle: This embodiment provides a control circuit for an ultrasonic dental hygienist. During use, the user inputs commands such as intensity level and operating mode to the microcontroller via the button input module. The microcontroller, acting as the control core, receives the commands and generates corresponding control signals based on its internally stored control parameter table.

[0041] The control signal is sent to an ultrasonic signal generator, which uses microcontroller-based pulse width modulation technology to generate an adjustable square wave signal with a frequency of 38kHz and a frequency resolution of ≤100Hz. The square wave signal then enters a power amplifier circuit. This circuit employs MOS boost technology and MOSFET drive. First, the MOSFET driver circuit drives the MOSFET to perform high-frequency switching, boosting the low-voltage square wave signal to a high-voltage signal via a boost transformer. Then, impedance matching is performed by a matching circuit to match the amplified signal power with the transducer's impedance, thus driving the transducer to operate.

[0042] During transducer operation, the feedback regulation module plays a crucial role. Its current detection function is achieved through a sampling resistor connected in series in the transducer's operating circuit. By detecting the voltage drop across the sampling resistor, Ohm's law is used to calculate the transducer's operating current, which is then converted into a voltage signal and fed back to the microcontroller. Based on this feedback signal, the microcontroller calculates the change in the transducer's load impedance and dynamically adjusts the control signal output to the ultrasonic signal generator, thereby tracking the transducer's resonant point and ensuring stable and efficient operation.

[0043] The power management module uses several 3.7V lithium batteries as its power source. The dedicated charging chip employs overvoltage protection, undervoltage protection, short-circuit protection, overcharge protection, over-discharge protection, and overheat protection, ensuring stable power supply to the entire circuit system and guaranteeing the normal operation of each module. The display module is electrically connected to the microcontroller. Based on user commands and the operating status of each module, the microcontroller controls the display module to show information such as the current intensity level, operating mode, and battery level, allowing users to easily understand the device's status.

[0044] The embodiments disclosed herein are preferred embodiments, but are not limited thereto. Those skilled in the art can readily grasp the spirit of this utility model based on the above embodiments and make different extensions and variations. However, as long as they do not depart from the spirit of this utility model, they are all within the protection scope of this utility model.

Claims

1. A control circuit for an ultrasonic dental scaler, characterized in that, It includes a microcontroller for receiving user input commands and generating corresponding control signals to coordinate the working status of each module, an ultrasonic signal generator for generating adjustable square wave signals, a transducer, a power amplifier circuit for amplifying the square wave signals, a feedback adjustment module for real-time monitoring of the transducer's operating current, a power management module, a display module for displaying current information, and a key input module. The microcontroller is electrically connected to the ultrasonic signal generator, power amplifier circuit, feedback adjustment module and power management module. The feedback adjustment module is electrically connected to the transducer to track the resonant point of the transducer. The display module is electrically connected to the microcontroller. The key input module is electrically connected to the microcontroller. The ultrasonic signal generator includes a signal generation circuit for converting the pulse width modulation signal output by the microcontroller into an adjustable square wave signal with a frequency of 38kHz. The power amplifier circuit includes a MOSFET driving circuit for receiving square wave signals to drive MOSFETs to perform high-frequency switching, a boost transformer for boosting low-voltage square wave signals to high-voltage signals, and a matching circuit for impedance matching of the boosted signals.

2. The ultrasonic dental scaler control circuit according to claim 1, characterized in that, The ultrasonic signal generator is based on single-chip microcomputer pulse width modulation technology and generates an adjustable square wave signal with a frequency of 38kHz and a frequency resolution of less than or equal to 100Hz.

3. The ultrasonic dental scaler control circuit according to claim 1, characterized in that, The power amplifier circuit is electrically connected to both the ultrasonic signal generator and the transducer. The power amplifier circuit employs MOS boost and MOSFET driving technology.

4. The ultrasonic dental scaler control circuit according to claim 1, characterized in that, The power management module is electrically connected to the microcontroller, ultrasonic signal generator, power amplifier circuit and feedback adjustment module. The power management module includes several sets of 3.7V lithium batteries as power supply and a charging chip for charging management of the lithium batteries.

5. The ultrasonic dental scaler control circuit according to claim 1, characterized in that, The microcontroller has a pre-stored control parameter table for generating control signals based on user instructions to adjust the frequency and power amplification of the square wave signal. The control parameter table corresponds to different intensity levels and working modes.

6. The ultrasonic dental scaler control circuit according to claim 1, characterized in that, The MOSFET driving circuit uses a high-speed, low-power driving chip, and the rise time and fall time of the output signal of the driving chip are both less than 100ns.

7. The ultrasonic dental scaler control circuit according to claim 1, characterized in that, The current detection function of the feedback regulation module is achieved through a sampling resistor, which is connected in series in the working circuit of the transducer.

8. The ultrasonic dental scaler control circuit according to claim 1, characterized in that, The display module is one or a combination of LED display and LCD display.

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