Battery-driven separately-excited frequency sweep circuit and ultrasonic cleaning device

Abstract

The utility model provides a battery-driven separately-excited frequency sweep circuit and an ultrasonic cleaning device, which are suitable for the field of high-precision cleaning of glasses, jewelry and the like. The device is powered by a battery, and the problem that traditional ultrasonic cleaning equipment depends on an external power source and is inconvenient to use is solved. The separate excitation type frequency sweep circuit generates a fixed frequency signal through the single-chip microcomputer control module and automatically adjusts the output frequency range according to load changes, and it is ensured that the ultrasonic generator keeps stable power output under different load conditions. The device comprises a transparent cup cover, a stainless steel cup, a silica gel ring, a cleaning tank, a main PCB, a battery pack and other assemblies, and all the assemblies are mechanically and electrically connected to achieve function integration. By optimizing the circuit design and adopting the high-efficiency industrial-grade ultrasonic generator, the low-energy-consumption and high-efficiency cleaning effect is realized, and the portability and the practicability of the equipment are remarkably improved.

Description

Technical Field

[0001] This utility model relates to cleaning devices, and more particularly to a battery-driven self-excited sweep frequency circuit and an ultrasonic cleaning device, which is suitable for high-precision cleaning of eyeglasses, jewelry and other similar items. Background Technology

[0002] Ultrasonic cleaning is widely used in cleaning various items, especially in the fields of eyeglasses and jewelry, where high cleaning effectiveness is required. To achieve good cleaning results, one approach is to increase the generator power or extend the cleaning time. However, both methods consume significant amounts of electricity, thus requiring an external power supply. This presents a significant inconvenience for users, limiting its use and restricting its mobility. While attempts have been made to use battery power, these have been largely unsuccessful due to the following issues: 1) Limited battery capacity and high cost; 2) Typical ultrasonic cleaning systems use self-excited oscillation-driven household plate generators, requiring long cleaning times or high power to achieve good results. Due to battery capacity limitations, the number of cleaning cycles a single charge can provide is limited. These factors restrict its commercialization. In the civilian ultrasonic cleaning field, due to cost and other constraints, self-excited drive circuits are a common driving method for ultrasonic cleaning equipment.

[0003] Self-excited drive circuit

[0004] One: Its main components include the following parts:

[0005] 1. Oscillating Circuit: The oscillating circuit is the core component of a self-excited drive circuit. It typically consists of an inductor (L), a capacitor (C), and a resistor (R), forming an LC oscillating loop. The oscillating circuit can generate an oscillation signal at a specific frequency, which is usually matched with the resonant frequency of the ultrasonic generator.

[0006] 2. Power Amplifier Circuit: The oscillation signal generated by the oscillation circuit is usually a low-power signal, which needs to be amplified to sufficient power by a power amplifier circuit to drive the ultrasonic generator. The power amplifier circuit is usually composed of transistors or other power devices.

[0007] 3. Ultrasonic Generator: An ultrasonic generator is a device that converts electrical energy into mechanical energy, typically composed of piezoelectric ceramic plates. When a high-frequency voltage is applied, the piezoelectric ceramic plates generate high-frequency vibrations, thereby producing ultrasonic waves; plate-shaped generators are generally used.

[0008] 4. Load: The load circuit includes a cleaning tank and a cleaning solution. The ultrasonic waves generated by the ultrasonic generator are transmitted through the cleaning solution to clean the items in the cleaning tank.

[0009] 2. The working principle of the self-excited drive circuit is as follows:

[0010] 1. Oscillation Start-up: When the circuit is powered on, the oscillation circuit starts working, generating an oscillation signal of a specific frequency. The frequency of this signal is determined by the parameters of the LC circuit, and is usually matched with the resonant frequency of the ultrasonic generator.

[0011] 2. Power Amplification: The low-power oscillation signal generated by the oscillation circuit is amplified by the power amplifier circuit to obtain sufficient power to drive the ultrasonic generator.

[0012] 3. Ultrasonic Wave Generation: The amplified high-frequency signal is applied to an ultrasonic generator, causing the piezoelectric ceramic sheet to vibrate at high frequency, thereby generating ultrasonic waves. The ultrasonic waves propagate in the cleaning fluid, achieving cleaning of items through the cavitation effect.

[0013] 4. Load Matching: The vibration frequency and amplitude of the ultrasonic generator need to be matched with the load (cleaning fluid and items to be cleaned) in the cleaning tank to ensure optimal cleaning results. Since the frequency of the self-excited drive circuit is determined by the oscillation circuit itself, the circuit frequency may drift to some extent when the load changes (such as changes in the water level of the cleaning fluid or an increase in the number of items to be cleaned), resulting in unstable cleaning results.

[0014] III. Existing Problems

[0015] Although self-excited drive circuits are widely used in ultrasonic cleaning equipment, they also have some problems:

[0016] 1. Poor frequency stability: The frequency of the self-excited drive circuit is easily affected by load changes, resulting in frequency drift, which in turn affects the cleaning effect.

[0017] 2. High energy consumption: In order to achieve a good cleaning effect, the self-excited drive circuit usually requires a high power output, which leads to high energy consumption and is not suitable for battery-powered applications.

[0018] 3. High circuit complexity: In order to improve frequency stability and cleaning effect, self-excited drive circuits usually require complex circuit design, which increases cost and maintenance difficulty. Utility Model Content

[0019] To address the above shortcomings, the purpose of this utility model is to provide an ultrasonic drive circuit and overall solution that is battery-powered and can achieve a long working time on a single charge.

[0020] To address the above problems, this utility model proposes a battery-driven self-excited frequency sweep circuit, characterized by comprising:

[0021] The battery module, which uses a rechargeable battery, is used to provide power to the circuit.

[0022] The microcontroller control module is used to generate fixed-frequency signals and control the operating state and parameters of the circuit.

[0023] The frequency sweep module is used to adjust the output frequency range according to load changes in order to maintain stable power.

[0024] The power amplifier circuit is used to amplify the low-power signal generated by the microcontroller control module to a sufficient power to drive the ultrasonic generator;

[0025] Ultrasonic generator

[0026] The temperature detection module is used to detect the circuit's operating temperature and provide overheat protection.

[0027] The charging control module is used to control the charging and discharging process of the battery to ensure safe charging.

[0028] The battery-driven self-excited frequency sweep circuit is characterized in that the frequency sweep module generates an inverted triangular waveform signal through capacitor charging and discharging, and the microcontroller control module periodically outputs PWM signals with different duty cycles to realize the periodic frequency sweep operation of the control drive frequency.

[0029] The battery-driven self-excited frequency sweep circuit is characterized in that the frequency sweep module generates an inverted triangular waveform signal through capacitor charging and discharging, and automatically adjusts the output frequency range according to load changes to adapt to different load conditions.

[0030] The battery-driven self-excited sweep frequency circuit is characterized in that the power amplifier circuit amplifies the low-power signal to a sufficient power to drive the ultrasonic generator.

[0031] The battery-driven self-excited sweep frequency circuit is characterized in that the ultrasonic generator is an industrial-grade ultrasonic generator.

[0032] The battery-driven self-excited frequency sweep circuit is characterized in that the temperature detection module includes a temperature sensor, which automatically cuts off the power supply to protect the circuit and battery when the circuit or battery temperature is detected to be too high.

[0033] The battery-driven self-excited frequency sweep circuit is characterized in that the charging control module includes an overcharge and over-discharge protection circuit to limit the charging current to no more than 1A, so as to extend battery life and ensure charging safety.

[0034] An ultrasonic cleaning device is characterized by comprising: a battery-driven self-excited sweep frequency circuit; a cleaning tank for holding items to be cleaned and cleaning fluid; a control panel for user operation and display of working status; and a cooling fan for reducing the temperature of the circuit and battery to ensure stable operation of the device.

[0035] The ultrasonic cleaning device is characterized in that it further includes components such as a transparent cup lid, a stainless steel cup, a silicone ring, a transparent top cover, a pressure ring, an O-ring, a cleaning tank sealing ring, a stainless steel cleaning tank, an inner cylinder, a main PCB board, a battery cover, a battery pack, a bottom shell, a water baffle, a silicone waterproof plug, a plug adapter, a DC plug, a battery switch, a switch PCB board, pins, a dual-bearing DC fan, a fan cover, a control PCB board, a button board, a button lens, and an ultrasonic generator. The components are functionally integrated through mechanical and electrical connections.

[0036] The ultrasonic cleaning device is characterized in that the microcontroller control module generates a fixed frequency signal, and the frequency is adjusted by the frequency sweep module to realize the frequency sweep working mode, so as to adapt to the cleaning needs under different load conditions.

[0037] This invention achieves low energy consumption, high efficiency, and portability in ultrasonic cleaning devices by employing a battery-driven, self-excited sweep frequency circuit. The self-excited sweep frequency circuit automatically adjusts the output frequency according to load changes, ensuring stable power output from the ultrasonic generator under different load conditions, significantly improving cleaning effectiveness and equipment adaptability. Simultaneously, the use of a high-efficiency industrial-grade ultrasonic generator further reduces energy consumption and extends battery life. Furthermore, simplified and optimized circuit design reduces overall heat generation, improving equipment stability and safety. Overall, this invention not only improves cleaning efficiency but also greatly enhances equipment portability and user experience. Attached Figure Description

[0038] Figure 1 It is the frequency sweep and drive section circuit of the self-excited drive circuit;

[0039] Figure 2 This is an embodiment diagram of an ultrasonic cleaning device. Detailed Implementation

[0040] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0041] The innovations of this utility model are: 1) Designing a circuit that can achieve a longer working time using a small-capacity rechargeable battery; with the improvement of battery cost and technology, the cost of larger capacity batteries has been further reduced, and the battery size has been reduced, while the heat dissipation and safety performance have been further improved, so that the cost increase brought by adding battery components is not significant; at the same time, by using an externally excited drive circuit to replace the self-excited drive circuit, the number of generators is reduced accordingly, replacing two or more household chip generators with a single low-power industrial generator, which is more efficient and can achieve the goal of maintaining the battery for a longer working time with the same battery capacity; 2) Due to the self-excited drive circuit mode, there are still uncertainties in the load due to different water levels and component parameter deviations when different users use it. The ultrasonic output frequency of the self-excited drive circuit is fixed, so there is a problem of load mismatch, resulting in poor ultrasonic cleaning effect and requiring a longer time to achieve the same cleaning effect. This invention modifies the circuit to be self-excited and, by adding a periodic scanning method, ensures that the driving frequency of the ultrasonic waves varies periodically within a preset range. This avoids prolonged fixed output at a frequency that is mismatched with the load, achieving a wide range of load matching and ensuring the generator's output efficiency and ultrasonic intensity. Because the overall output generator power is more stable and the industrial generator has higher conversion efficiency, the cleaning time required to achieve the same cleaning effect each time can be significantly shortened. For example, the improved design achieves the cleaning effect of a 3-minute existing sheet generator in 50 seconds, further increasing the number of cleaning services achievable on a single charge and making the industrialization of battery-powered applications more valuable. By adopting a self-excited drive circuit and a single industrial generator, the overall circuit is simplified, the overall efficiency is higher, and the heat generation of the entire circuit is reduced.

[0042] Figure 1 This refers to the frequency sweep and drive section of the self-excited drive circuit. The self-excited drive circuit is an improved driving method for ultrasonic cleaning equipment, mainly including:

[0043] 1. Microcontroller control module: The microcontroller control module is the core part of the self-excited drive circuit. It is used to generate and control the sweep frequency signal to ensure that the circuit maintains a stable output frequency under different load conditions.

[0044] 2. Frequency sweep module: The frequency sweep module generates an inverted triangular waveform signal through capacitor charging and discharging, and adjusts the output frequency range according to load changes to maintain stable power.

[0045] 3. Power amplifier circuit: Amplifies the low-power signal generated by the microcontroller to a sufficient power to drive the ultrasonic generator.

[0046] 4. Ultrasonic generator: Converts electrical energy into mechanical energy to generate ultrasonic waves for cleaning.

[0047] 5. Temperature detection module: Used to detect the operating temperature of the circuit to ensure the safe operation of the equipment.

[0048] 6. Charging control module: Used to control the charging and discharging process of the battery to ensure safe charging.

[0049] I. Brief Description of Overall Working Principle:

[0050] 1. Frequency generation: The microcontroller control module generates a signal with a fixed frequency. This signal is then frequency-adjusted by the frequency sweep module to generate a frequency sweep signal within a frequency range.

[0051] 2. Power Amplification: The swept frequency signal is amplified by a power amplifier circuit to obtain sufficient power to drive the ultrasonic generator.

[0052] 3. Ultrasonic Wave Generation: The amplified sweep frequency signal is applied to the ultrasonic generator, causing the piezoelectric ceramic sheet to vibrate at high frequency, thereby generating ultrasonic waves. The ultrasonic waves propagate in the cleaning fluid, achieving cleaning of items through the cavitation effect.

[0053] 4. Load Adaptability: The sweep frequency module can automatically adjust the output frequency according to load changes (such as changes in the cleaning fluid level or an increase in the number of items being cleaned), ensuring stable power output under different load conditions. Since the materials used in the cleaning device inevitably have some variation, the load will inevitably differ, especially since different users may have different water levels during use. Therefore, if a fixed frequency output is used, the cleaning device may not operate at its optimal state, and there may be load mismatch, overheating, and malfunction. To address this, the sweep frequency module is controlled, allowing the device to operate dynamically within a certain frequency range. The microcontroller control module generates an initial sweep frequency signal, such as an output drive PWM signal, which is used to achieve the output through different duty cycles. A capacitor charging and discharging generates an inverted triangular waveform signal, and the actual output frequency is controlled by this inverted triangular waveform signal, thus achieving sweep frequency output that can adapt to different load changes. As a further improvement, a detection unit for the generator output can be added to monitor the generator's operating status and automatically adjust the frequency to ensure the generator operates in an optimal state. For example, when the load increases (such as a decrease in the cleaning fluid level), the sweep frequency module will automatically adjust the frequency to ensure the ultrasonic generator's power output remains stable.

[0054] II. Circuit Connections: The main connection relationships of the self-excited circuit are as follows:

[0055] 1. Power supply module: +5V and +16.8V power supplies provide power to different circuit modules respectively.

[0056] 2: Microcontroller control module:

[0057] 3: U2 (CD4046) is a frequency synthesizer that generates a fixed frequency signal; transistors such as Q3 and Q13 are used for signal amplification and control.

[0058] 4: Frequency sweep module:

[0059] A charging and discharging circuit is formed by capacitors C21, C22, C23, C24, etc. and resistors R30, R31, R32, R33, etc., to generate an inverted triangular waveform signal; transistors Q10, Q14, etc. are used for frequency adjustment and power amplification.

[0060] 5: Power amplifier circuit: Power transistors such as Q8 and Q10 (e.g., RF540A) are used to amplify low-power signals to sufficient power to drive the ultrasonic generator.

[0061] 6: Ultrasonic generator: Connected to the output of the power amplifier circuit, it receives the amplified sweep frequency signal and generates ultrasonic waves.

[0062] 7: Temperature detection module: The temperature sensor is used to detect the operating temperature of the circuit to ensure the safe operation of the equipment.

[0063] 8: Charging control module: Enables safe charging and discharging of the battery through battery switches and charging control circuits (such as R47, R48, C29, etc.).

[0064] Thirdly: Advantages of self-excited circuits

[0065] 1. High frequency stability: The self-excited circuit generates a fixed frequency signal through the microcontroller control module and adjusts the frequency through the frequency sweep module, which can effectively avoid the frequency drift problem caused by load changes in the self-excited circuit.

[0066] 2. Low energy consumption: The self-excited circuit uses a high-efficiency power amplifier circuit and an industrial-grade ultrasonic generator, which can achieve good cleaning effect at a low power and significantly reduce energy consumption.

[0067] 3. Simple circuit: The design of the self-excited circuit is relatively simple, reducing the complexity of the oscillation circuit and power amplifier circuit, thus reducing cost and maintenance difficulty.

[0068] 4. High adaptability: The frequency sweep module can automatically adjust the frequency according to load changes, ensuring stable power output under different load conditions, thus improving the adaptability and reliability of the equipment.

[0069] Figure 2This is an embodiment diagram of an ultrasonic cleaning device, mainly including: a transparent cup lid 1, made of PC, used to cover the cleaning tank and prevent liquid splashing; a stainless steel cup 2, made of SUS 804, used to hold the cleaning fluid and items to be cleaned; a silicone ring 3, used for sealing to prevent liquid leakage; a transparent top cover 4, which cooperates with the pressure ring to fix the upper structure of the cleaning tank; a pressure ring 5, used to fix the transparent top cover to ensure structural stability; an O-ring 6, used for further sealing to ensure the sealing and waterproof performance of the cleaning tank; a cleaning tank sealing ring 7, used to seal the cleaning tank to prevent liquid leakage; a stainless steel cleaning tank 8, used to hold the cleaning fluid (water) and items to be cleaned; an inner cylinder 9, located inside the cleaning tank, used to fix and support the ultrasonic generator; a main PCB board 10, the core component of the control circuit, realizing the control of the entire device; a battery cover 11, used to fix the battery pack to ensure the stability of the battery module; and a battery pack 12, model: 18650, which provides power to the device. The device includes: a bottom shell 13 for protecting internal components and preventing external interference; a water-retaining eave 14 for preventing water from entering the circuitry and ensuring circuit safety; a silicone waterproof plug 15 for waterproofing and protecting the circuitry; a plug adapter 16 for power plug conversion; a DC plug 17 for connecting to an external power source or charging device; a battery switch 18 for controlling the battery's on / off state; a switch PCB board 19 for controlling the switch function; pins 20; a dual-bearing DC fan 21 for heat dissipation, reducing the temperature of the circuitry and battery (an improvement that further reduces power consumption); a fan cover 22 for fixing the fan and ensuring effective heat dissipation; a control PCB board 23 for controlling the overall operating status of the device; a button panel 24 for user operation, enabling start / stop functions; a button lens 25 for displaying the operating status; an ultrasonic generator 26 using a single 50W industrial-grade generator with a diameter of 38mm; and an ultrasonic generator insulating sheet 27.

[0070] The above-disclosed embodiments are merely one example of the present utility model and should not be construed as limiting the scope of the present invention. Those skilled in the art can understand that implementing all or part of the processes of the above embodiments and making equivalent changes in accordance with the claims of the present utility model still fall within the scope of the present utility model.

Claims

1. A battery-driven self-excited frequency sweep circuit, characterized in that, include: The battery module, which uses a rechargeable battery, is used to provide power to the circuit. The microcontroller control module is used to generate fixed-frequency signals and control the operating state and parameters of the circuit. The frequency sweep module is used to adjust the output frequency range according to load changes in order to maintain stable power. The power amplifier circuit is used to amplify the low-power signal generated by the microcontroller control module to a sufficient power to drive the ultrasonic generator; Ultrasonic generator The temperature detection module is used to detect the circuit's operating temperature and provide overheat protection. The charging control module is used to control the charging and discharging process of the battery to ensure safe charging.

2. The battery-driven parametric sweep circuit according to claim 1, wherein The frequency sweep module generates an inverted triangular waveform signal through capacitor charging and discharging. The microcontroller control module periodically outputs PWM signals with different duty cycles to achieve periodic frequency sweeping of the control drive frequency.

3. The battery-driven parametric sweep circuit according to claim 1, wherein The frequency sweep module generates an inverted triangular waveform signal through capacitor charging and discharging, and automatically adjusts the output frequency range according to load changes to adapt to different load conditions.

4. The battery-driven parametric sweep circuit according to claim 1, wherein The power amplifier circuit amplifies the low-power signal to a sufficient power to drive the ultrasonic generator.

5. The battery-driven parametric sweep circuit according to claim 1, wherein The ultrasonic generator is an industrial-grade ultrasonic generator.

6. The battery-driven parametric sweep circuit according to claim 1, wherein The temperature detection module includes a temperature sensor that automatically cuts off the power supply to protect the circuit and battery when it detects that the circuit or battery temperature is too high.

7. The battery-driven parametric sweep circuit according to claim 1, wherein The charging control module includes an overcharge and over-discharge protection circuit to limit the charging current to no more than 1A, thereby extending battery life and ensuring charging safety.

8. An ultrasonic cleaning apparatus, characterized by comprising: include: The battery-driven self-excited sweep frequency circuit as described in any one of claims 1 to 7; a cleaning tank for holding items to be cleaned and cleaning fluid; a control panel for user operation and display of working status; and a cooling fan for reducing the temperature of the circuit and battery to ensure stable operation of the equipment.

9. The ultrasonic cleaning apparatus according to claim 8, characterized in that, The device also includes the following components: a transparent cup lid, a stainless steel cup, a silicone ring, a transparent top cover, a pressure ring, an O-ring, a cleaning tank sealing ring, a stainless steel cleaning tank, an inner cylinder, a main PCB board, a battery cover, a battery pack, a bottom shell, a water-retaining eave, a silicone waterproof plug, a plug adapter, a DC plug, a battery switch, a switch PCB board, feet, a dual-bearing DC fan, a fan cover, a control PCB board, a button board, button lenses, and an ultrasonic generator. The components are integrated through mechanical and electrical connections.

10. The ultrasonic cleaning apparatus according to claim 9, characterized in that, The microcontroller control module generates a fixed frequency signal, and the frequency is adjusted by the frequency sweep module to achieve a frequency sweep working mode, so as to adapt to the cleaning needs under different load conditions.

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