TWI673109B - Ultrasonic driving device with self-calibration funciton - Google Patents

Abstract

The invention provides an ultrasonic drive device with a self-correction function, which uses a central control module and a drive module to set the ultrasonic frequency so as to achieve full-frequency ultrasonic operation; and is performed by a phase comparison module. The phase information is returned to confirm the better resonance frequency of the ultrasonic sprinkler. In addition, the power calculation unit can also be used to monitor the aging status of the ultrasonic sprinkler to remind the time when the nozzle is replaced. Furthermore, the temperature The sensor module monitors the temperature of the ultrasonic sprinkler, cooperates with the critical adjustment unit to judge and adjust the temperature criticality, prolongs the continuous use time of the ultrasonic sprinkler, reduces the displacement attenuation of the ultrasonic vibration, and increases the output of the ultrasonic sprinkler. .

Description

Ultrasonic driving device with self-correcting function

The invention relates to an ultrasonic driving device, in particular to an ultrasonic driving device with a self-correcting function.

Ultrasound has a very wide range of applications. One of them is applied to spray heads. Ultrasonic spray heads can atomize liquid and then spray on the surface of objects to form a thin film. In short, ultrasonic spraying technology uses the principle of electronic vibration. The piezoelectric ceramic oscillator generates high-frequency shock waves to break up the molecular structure of the supplied coating. In this way, the coating is shaken into very small mist particles. At the same time, the solid particles in the coating can be avoided to affect the uniformity of the film and Quality, the characteristics of the formed film can achieve a specific function according to the material of the coating. For example, the use of antibacterial or waterproof coating can make the surface of the object antibacterial or waterproof. In addition, it is extremely difficult to form a surface film using other methods on the surface of an irregular object in general, but by using ultrasonic spraying, a thin film can be effectively and uniformly formed.

The current ultrasonic spray head atomization drivers are all operated at a single frequency, such as "A kind of ultra-micro atomization spraying method" of Chinese Patent Publication No. 102019264, which discloses a method using two different spraying methods to achieve uniform coating In these technologies, in order to select the frequency, the ultrasonic sprinkler and its corresponding driver must be replaced at the same time, and there is no warning effect on the aging efficiency of the ultrasonic sprinkler, which is likely to cause the piezoelectric transducer inside the sprinkler. After the surface is damaged or easily heated, The reduced output power cannot meet the needs of use. In addition, ultrasonic nozzles of different frequencies will have slightly different resonance frequencies. For example, the ultrasonic nozzle marked 28KHz may have an actual resonance frequency of 28.3KHz. If the oscillation frequency is set to 28KHz If it is operated, it may not be used under the best working efficiency, but it will easily cause the aging and damage of the nozzle.

Therefore, how to effectively solve the above problems is really the goal of active R & D and improvement.

The main purpose of the present invention is to solve the problem that the ultrasonic spray heads of different frequencies need to be replaced together with the driver.

A secondary object of the present invention is to solve the problem that the ultrasonic spray head does not actually operate at its effective resonance frequency.

In order to achieve the above object, the present invention provides an ultrasonic drive device with a self-correction function, which includes a central control module, a drive module electrically connected to the central control module, and an electric property to the drive module. The connected ultrasonic spray head and a phase comparison module electrically connecting the ultrasonic spray head and the central control module. The central control module sets the frequency and power of the ultrasonic oscillation and outputs a driving signal; the driving module receives a driving signal transmitted by the central control module for corresponding power output; the ultrasonic spray head performs the driving through the driving module The ultrasonic vibration of the corresponding frequency; the phase comparison module obtains a working voltage and a working current of the ultrasonic spray head, and performs phase comparison to transmit phase information back to the central control module. Therefore, the central control module uses the phase information to further determine a resonance frequency of the ultrasonic sprinkler, and performs fine adjustment of the frequency of the ultrasonic oscillation, so that the ultrasonic sprinkler operates at the resonant frequency.

In summary, the present invention has the following characteristics:

First, the use of a central control module with a drive module can set the frequency of the ultrasound, without the need to replace the driver and the ultrasound nozzle at the same time.

2. The phase comparison module is used to return the phase information, so that the central control module can know the better resonance frequency of the ultrasonic spray head, thereby achieving the effect of improving efficiency.

10‧‧‧ Central Control Module

11‧‧‧Phase Locked Loop Frequency Control Unit

12‧‧‧pulse width modulation unit

13‧‧‧Critical adjustment unit

20‧‧‧Driver Module

21‧‧‧digital analog conversion unit

22‧‧‧Signal Amplifier Unit

30‧‧‧ Ultrasonic Nozzle

31‧‧‧Working voltage

32‧‧‧Working current

40‧‧‧phase comparison module

50‧‧‧power calculation unit

60‧‧‧Temperature sensing module

[FIG. 1] A block configuration diagram of a preferred embodiment of the present invention.

[FIG. 2] A block configuration diagram of another preferred embodiment of the present invention.

[Fig. 3] Fig. 3 is a comparison result diagram of temperature control differences in a preferred embodiment of the present invention.

Exemplary embodiments of the present invention are described in detail below with reference to the accompanying drawings, and are not intended to limit the technical principles of the present invention to specific disclosed embodiments, but the scope of the present invention is limited only by the scope of patent applications, covering substitutions, modifications and Equivalent.

Please refer to FIG. 1, the present invention is an ultrasonic drive device with self-correction function, which includes a central control module 10, a drive module 20 electrically connected to the central control module 10, and a drive module 20 The ultrasonic spray head 30 electrically connected to the driving module 20 and a phase comparison module 40 electrically connected to the ultrasonic spray head 30 and the central control module 10. The central control module 10 sets the frequency and power of the ultrasonic oscillation and outputs a driving signal. In this embodiment, the central control module 10 may be a field-programmable gate array (FPGA). And contains A phase-locked loop frequency control unit 11 receiving the phase information and a pulse-width modulation unit 12 electrically connected to the phase-locked loop frequency control unit 11. The user can use an external connection interface such as RS485 or a network The control interface performs frequency input, and further locks the frequency through the phase-locked loop frequency control unit 11, and the pulse width modulation unit 12 performs waveform output according to a predetermined frequency.

The driving module 20 receives a driving signal transmitted by the central control module 10 for corresponding power output. In this embodiment, the driving module 20 includes a digital analog conversion electrically connected to the central control module 10. Unit 21 and a signal amplification unit 22 electrically connected to the digital analog conversion unit 21. The digital analog conversion unit 21 receives the digital signal of the pulse width modulation unit 12 and converts it to an analog waveform signal for output, then The signal amplification unit 22 increases the power to drive the ultrasonic spray head 30.

The ultrasonic spray head 30 performs ultrasonic vibration of a corresponding frequency through the driving module 20, and further atomizes and outputs a predetermined spraying material or liquid.

The phase comparison module 40 obtains a working voltage 31 and a working current 32 of the ultrasonic spray head 30, and performs phase comparison to transmit phase information to the central control module 10. Accordingly, the central control module 10 uses the phase information to further determine a resonance frequency of the ultrasonic spray head 30, and performs fine adjustment of the frequency of the ultrasonic oscillation, so that the ultrasonic spray head 30 operates at the resonant frequency. To further explain, if the ultrasonic sprinkler 30 operates at its resonance frequency, the phases of the operating voltage 31 and the operating current 32 should be the same. Therefore, the phase comparison module 40 is used to obtain the operating voltage 31 and the operating current 32. After the phase difference, the central control module 10 can judge and adjust the frequency of the ultrasonic oscillation to control the ultrasonic sprinkler 30 to work at its corresponding resonance frequency for ultrasonic oscillation.

In addition, the present invention further has a power calculation unit 50 electrically connecting the ultrasonic spray head 30 and the central control module 10. The power calculation unit 50 calculates the ultrasonic spray head 30 based on the working voltage 31 and the working current 32. A power value is transmitted back to the central control module 10. In addition to monitoring the phase of the operating voltage 31 and the operating current 32 of the ultrasonic spray head 30, the actual working efficiency of the ultrasonic spray head 30 can be transmitted back to the central control module 10 through the power calculation unit 50, thereby obtaining Knowing the actual output power of the ultrasonic sprinkler 30 can monitor the aging degree of the ultrasonic sprinkler 30 on the one hand, and can also determine whether it conforms to the central control module by knowing the actual output power of the ultrasonic sprinkler 30 10 scheduled outputs.

Furthermore, the ultrasonic sprinkler 30 is suitable for working near room temperature. If the temperature is too high, it will affect the vibration displacement of the ultrasonic sprinkler 30 itself, and even cause the ultrasonic sprinkler 30 to stop working. Therefore, it has a self-correcting function. The ultrasonic driving device may further include a temperature sensing module 60 that detects the temperature of the ultrasonic spray head 30. The temperature sensing module 60 is electrically connected to the central control module 10 to connect the ultrasonic spray head 30. The working temperature is transmitted back to the central control module 10 in real time; please refer to FIG. 2 for reference. In this embodiment, the central control module 10 further has an electrical connection with the temperature sensing module 60. The critical adjustment unit 13 adjusts the driving signal according to the temperature change of the temperature sensing module 60. For example, it can set the upper limit of the temperature, for example, 36 degrees Celsius. The critical adjustment unit 13 When the temperature of the ultrasonic sprinkler 30 is monitored by the temperature sensing module 60 to be greater than 36 degrees Celsius, a signal is sent to the central control module 10, thereby reducing the output power of the driving module 20 to avoid the ultrasonic Sound wave Head 30 temperature continues to rise.

In addition, the criticality adjustment unit 13 may also set a criticality judgment based on a slope of temperature change with time. When the slope is greater than a critical slope, the driving signal is adjusted to reduce the output power of the driving module 20, where In this embodiment, the critical slope is 0.025 (° C / Min), The vertical coordinate of the slope is the temperature change in degrees Celsius, and the horizontal coordinate is the time in minutes. Since the temperature of the ultrasonic spray head 30 rises to a normal state with the use time, if the temperature is used as a critical judgment, it is easy to reduce the power significantly because the ultrasonic spray head 30 reaches the set temperature. Therefore, in this embodiment, the use of The slope of the change in temperature and time is a critical judgment factor. It is only necessary to avoid a large increase in temperature, thereby extending the continuous use time of the ultrasonic sprinkler 30 and increasing the process output of the ultrasonic sprinkler 30 equipment. Please refer to FIG. 3 for comparison. The comparison result of the temperature change slope difference of the ultrasonic sprinkler 30 is monitored by the critical adjustment unit 13. When the initial temperature is 25 ° C, the displacement is 20 micrometers (μm). The ultrasonic spray head 30 without temperature control has reached 37 ° C for 15 days of continuous use, and the displacement is 15 microns, which is only 75% of the initial state. The ultrasonic wave using the critical adjustment unit 13 for temperature change slope control Nozzle 30. On the 15th day of continuous use, the temperature of the ultrasonic nozzle 30 was 32 ° C, the displacement was 17 microns, and there was still 85% of the initial state. After 240 days of continuous use, the The temperature was 36 ° C and the displacement was 15 microns. If 75% of the displacement of the ultrasonic spray head 30 is used as the critical point for judgment, the ultrasonic spray head 30 without temperature control can only be used continuously for 15 days and must be replaced; and the critical adjustment unit 13 of the present invention is used. By controlling the temperature slope, the ultrasonic spray head 30 can be continuously used for more than 240 days, which clearly shows the results of the present invention.

In summary, the present invention has the following characteristics:

1. Using the central control module 10 such as FPGA and the driving module 20, the frequency of the ultrasonic wave can be set, without the need to replace the driver and the ultrasonic spray head 30 at the same time.

Second, the phase comparison module 40 returns the phase information so that the central control module 10 can learn the better resonance frequency of the ultrasonic spray head 30, thereby achieving the effect of improving efficiency.

3. The power calculation unit 50 is used to further monitor the working efficiency of the ultrasonic sprinkler 30. It can be found immediately when signal errors between various modules occur, and the aging of the ultrasonic sprinkler 30 can be understood through performance monitoring. The condition, when the performance is obviously insufficient, the user is reminded to replace it.

Fourth, the temperature of the ultrasonic sprinkler 30 is monitored through the temperature sensing module 60, and the power calculation unit 50 is used to simultaneously monitor the power and temperature to more effectively monitor the aging condition of the sprinkler.

V. The critical adjustment unit 13 cooperates with the temperature sensing module 60 to perform temperature critical judgment and adjustment, to extend the continuous use time of the ultrasonic sprinkler 30, to reduce the displacement attenuation problem of the ultrasonic vibration, and to increase the ultrasonic sprinkler 30's Working output.

Although the present invention has been described with reference to a preferred embodiment, those skilled in the art can make various changes without departing from the spirit and scope of the present invention. The above-mentioned embodiments are only used to illustrate the present invention, and are not intended to limit the scope of the present invention. Various modifications or changes that do not violate the spirit of the present invention are all within the scope of patent application of the present invention.

Claims (8)

An ultrasonic driving device with self-calibration function includes: a central control module, which sets the frequency and power of ultrasonic oscillation and outputs a driving signal; a driving module electrically connected to the central control module, which Receiving a driving signal transmitted by the central control module for corresponding power output; an ultrasonic spray head electrically connected to the driving module, which performs ultrasonic vibration of a corresponding frequency through the driving module; and an electrical connection The phase comparison module of the ultrasonic spray head and the central control module obtains a working voltage and a working current of the ultrasonic spray head, and performs phase comparison to transmit phase information back to the central control module; the central The control module uses the phase information to further determine a resonance frequency of one of the ultrasonic spray heads, and performs fine adjustment of the frequency of the ultrasonic oscillation, so that the ultrasonic spray heads work at the resonant frequency. The ultrasonic driving device with self-correction function according to claim 1, wherein the central control module is a field programmable gate array, and includes a phase-locked loop frequency control unit for receiving the phase information, and a A pulse width modulation unit electrically connected to the phase-locked loop frequency control unit. The ultrasonic driving device with self-correction function according to claim 2, wherein the driving module includes a digital analog conversion unit electrically connected to the central control module, and an electrical connection to the digital analog conversion unit Signal amplification unit. The ultrasonic driving device with self-calibration function according to claim 1, further comprising a power calculation unit electrically connecting the ultrasonic spray head and the central control module, which is used for obtaining the The working voltage and the working current of the ultrasonic sprinkler head are used to calculate a power value of the ultrasonic sprinkler head, which is then transmitted to the central control module. The ultrasonic driving device with self-calibration function according to claim 1, further comprising a temperature sensing module for detecting the temperature of the ultrasonic spray head, and the temperature sensing module is electrically connected to the central control module. It is connected to the central control module in real time. The ultrasonic driving device with self-calibration function according to claim 5, wherein the central control module further has a critical adjustment unit electrically connected to the temperature sensing module, which is based on the temperature sensing module The driving signal is adjusted according to the temperature change. The ultrasonic driving device with a self-correcting function according to claim 6, wherein the critical adjustment unit performs a critical judgment based on a slope of temperature change with time, and when the slope is greater than a critical slope, the driving signal is adjusted to reduce The output power of the drive module. The ultrasonic drive device with self-correction function according to claim 7, wherein the critical slope is 0.025 (° C / Min).