TWI678468B - Driving and frequency compensation method of micro pump - Google Patents

Abstract

A method for driving frequency sweep compensation of a micro pump is suitable for a micro pump system. The micro pump system includes a micro pump and a microprocessor module. The steps include: (a) the microprocessor module performs an initial scan of the system frequency of the micro pump, To read the maximum current peak value and output the corresponding best working frequency when the micro pump is in operation; (b) Define the range of the sub-scanning frequency band from the optimal working frequency output in step (a), and scan in this frequency range. Compare the maximum current peak and output the corresponding best working frequency, repeat the scanning of the scanning frequency range to continuously output the best working frequency, and maintain the working efficiency of the mini pump.

Description

Compensation method for driving sweep frequency of micro pump

This case relates to a method for driving a micropump, especially a method for compensating the frequency of a drive that is applied to the drive of a micropump.

At present, the products in all industries are developing towards miniaturization and miniaturization. Among them, micro pump products are the key technology of a fluid conveying device. How to achieve small size, miniaturization and quietness, so as to achieve portability and portability. Miniature pumps for this purpose are currently the main subject of research and development. As shown in Fig. 1, the micro pump 1 is a piezoelectric-driven pump. As shown in Figs. 2A and 2B, when a voltage is applied to the piezoelectric element 11, it will deform and drive the vibration plate 12 to move up and down to compress the chamber. Volume to achieve fluid transport.

The driving method of applying voltage to the piezoelectric element 11 of the micro pump 1 described above requires an operating frequency to control and adjust the amplitude of the vibration plate 2 to achieve an optimal performance. However, when the micro pump 1 is operating, the frequency-time relationship diagram is shown in FIG. 3, and the working frequency will decrease as the operation time increases. This is the working temperature of the micro pump 1 affecting the operating frequency, as shown in FIG. 4 The working frequency shown is inversely proportional to the temperature. The higher the working temperature will affect the variation of the actual working frequency, so the micro pump 1 cannot maintain a constant required operating frequency. Therefore, the operating temperature will affect the deviation of the operating frequency. , Directly affect the efficiency of fluid output, in order to overcome this problem is an important subject developed in this case.

The main purpose of this case is to provide a method for driving a frequency sweep compensation method for a micropump. When the micropump is in operation, the operating frequency is offset with the variation of the continuous operating temperature, and the optimal operating frequency is adjusted by continuous scanning compensation to maintain the micro The best performance of the pump.

In order to achieve the above purpose, the present invention provides a driving frequency compensation method for a micro pump, which is suitable for a micro pump system. The micro pump system mainly includes a micro pump and a microprocessor module. Including steps: (a) is the initial scan of the system frequency of the micropump, and the microprocessor module performs an initial scan of the system frequency of the micropump to read the maximum current peak value of the micropump during operation and output the maximum current peak value Corresponding best working frequency; (b) Scanning for the sub-scanning frequency range of the micro pump. Step (a) analyzes the optimal working frequency corresponding to the maximum current peak to define the sub-scanning frequency range, and This band range scan compares the maximum current peak, and uses the output frequency corresponding to the maximum current peak as the optimal working frequency. The micropump continues to operate, and then the maximum current peak is compared with the scan of the sub-scanning frequency range, and then locked. The corresponding operating frequency is used as the optimal operating frequency to maintain the working efficiency of the micropump.

Some typical embodiments that embody the features and advantages of this case will be described in detail in the description in the following paragraphs. It should be understood that this case can have various changes in different aspects, all of which do not depart from the scope of this case, and the description and drawings therein The display is intended to be illustrative in nature and not intended to limit the case.

Please refer to Figs. 5 and 7 at the same time. This case provides a method for compensating the drive frequency of a micropump, which is applicable to the micropump system 100. The micropump system 100 includes a micropump 1, a driver 2 and a microprocessor module 3. The processor module 3 further includes a counter 31, a resistor 32, a current detector 33, and an integrated circuit bus 34 (I²C). The driver 2 is used to control the operation of the micropump 1. The counter 31 of the microprocessor module 3 can provide The adjusted system frequency is provided to the driver 2 to drive the micro pump 1. The resistor 32 and the current detector 33 are used to detect the current value of the micro pump 1 during operation. The integrated circuit bus 34 is used to analyze the operation and output the best work required. frequency. When the mini pump 1 of the micro pump system 100 is in operation, the operating frequency is shifted due to the variation of the continuous operating temperature. Through the method of driving the frequency sweep compensation method of the micro pump in this case, the optimal working frequency is adjusted by continuous scanning compensation to maintain the micro pump 1 The main steps for optimal work efficiency are described in the following paragraphs.

First perform step a to perform an initial scan of the system operating frequency of the micro pump 1 of the micro pump system 100. When the micro pump 1 is operating, the counter 31 of the microprocessor module 3 provides a modulated system frequency to the driver 2 and causes The driver 2 drives the micropump 1. At this time, the microprocessor module 3 performs an initial scan of the system frequency, and uses the resistor 32 on the output line with the current detector 33 to detect the current peak when the micropump 1 is operating to read the operation of the micropump 1. When the maximum current peak value is reached, the integrated circuit bus 34 is fed back, so that the integrated circuit bus 34 of the microprocessor module 3 analyzes the maximum current peak to set the optimal working frequency required by the counter 31. Module 3 performs an initial scan of the system frequency to read the maximum current peak value when the micropump 1 is operating. As shown in FIG. 6, the maximum current peak value is the optimal operating frequency fr of the micro pump 1.

Then, step b is performed to scan the frequency range of the sub-scan for the working frequency of the micro pump 1 of the micro pump system 100. When the micro pump 1 continues to operate, as shown in FIG. 2A and FIG. 2B, the operating temperature variation will occur. The shift of the operating frequency uses the microprocessor module 3 to perform another scan, and analyzes it to output the operating frequency after the offset corresponding to the maximum current peak as the optimal operating frequency, which means that the maximum is analyzed by step a The working frequency corresponding to the current peak defines the range of the sub-scanning frequency band, and the maximum current peak is compared with this frequency range scanning, and the working frequency corresponding to the maximum current peak is locked as the optimal working frequency. Taking this embodiment as an example, the scanning of the scanning frequency range in step b is performed. At this time, the operating frequency is already the offset operating frequency caused by the operating temperature variation during the continuous operation of the micropump 1. Thus, the operation corresponding to the maximum current peak is analyzed in step a. The frequency defines the range of the sub-scanning frequency band. The range of the sub-scanning frequency band is to read the working frequency corresponding to the maximum current peak value as the center working frequency. For example, in step a, analyze the working frequency corresponding to the maximum current peak value to find the center. The operating frequency is fr ', the system frequency is f, the operating bandwidth of each segment is w, and the operating bandwidth of each segment is w = 1 / f. Find the frequency range of the sub-scanning frequency fr' + 2w, fr '+ 1w, fr' , Fr'-1w, fr'-2w. For example, when the operating bandwidth w is 0.1khz and the center operating frequency fr 'is 28, the counter 31 of the microprocessor module 3 provides five operating frequencies of 28.2, 28.1, 28, 27.9, and 27.8 respectively for this purpose. The range of the second scan, and compare the maximum current peak with the five frequency bands of 28.2, 28.1, 28, 27.9, and 27.8, and lock the working frequency corresponding to the maximum current peak as the optimal working frequency. For example, the maximum current peak is between 27.9 Working frequency, you can adjust the optimal working frequency of the micro pump 1 to 27.9 to achieve the best performance. In this way, the continuous operation of the micro pump 1 will repeat the scanning in the frequency range of the secondary scanning to compare the corresponding peak current lock. The operating frequency is used as the optimal operating frequency to achieve compensation for the offset operating frequency generated by the temperature variation of the continuous operation of the micropump 1 to maintain the optimal working efficiency of the micropump 1.

In summary, the present invention provides a method for compensating the frequency sweep of a micropump. When the micropump is in operation, the operating frequency is shifted with the variation of the continuous operating temperature. The optimal operating frequency is adjusted by continuous scanning compensation to maintain the micropump. The best work efficiency.

This case can be modified by anyone who is familiar with this technology, but it is not as bad as the protection of the scope of patent application.

1‧‧‧ Mini Pump

11‧‧‧ Piezoelectric element

12‧‧‧Vibration plate

100‧‧‧ Mini Pump System

2‧‧‧Driver

3‧‧‧Microprocessor Module

31‧‧‧ Counter

32‧‧‧ resistance

33‧‧‧Current Detector

34‧‧‧Integrated Circuit Bus

Steps of a ~ b‧‧‧Miniature Pump Compensation Method

fr‧‧‧ best working frequency

Figure 1 shows a schematic diagram of the appearance of the micropump in this case. Figures 2A to 2B are schematic diagrams showing the conveying action of the micropump of the present invention. Figure 3 shows the relationship between the operating frequency and time during the operation of the micropump in this case. Figure 4 shows the relationship between the operating frequency and temperature during the operation of the micropump in this case. Figure 5 shows the schematic diagram of the micropump system in this case. Figure 6 shows the relationship between the working current and the working frequency of the micropump in this case. FIG. 7 is a schematic diagram showing the implementation steps of the driving frequency compensation method of the micro pump of the present invention.

Claims (2)

A method for driving frequency sweep compensation of a micro pump is applicable to a micro pump system. The micro pump system mainly includes a micro pump and a microprocessor module. The method of frequency sweep compensation for driving a micro pump includes steps: (a) is Initial scan of the system frequency of the micropump. The microprocessor module performs an initial scan of the system frequency of the micropump to read the maximum current peak value when the micropump is in operation and output the optimal working frequency corresponding to the maximum current peak value. (B) Scanning for the sub-scanning frequency range of the micropump, defining the range of the sub-scanning frequency range by analyzing the optimal working frequency corresponding to the maximum current peak value in step (a), and the microprocessor module pair The maximum current peak is compared with this frequency range scan, and the working frequency corresponding to the maximum current peak is output as the optimal working frequency. The micropump continues to operate, and then the maximum current peak is compared with the scan in the sub-scanning frequency range. The corresponding working frequency is locked as the optimal working frequency to maintain the working efficiency of the micropump. The method for compensating the frequency sweep of a micropump as described in item 1 of the scope of the patent application, wherein the range of the frequency range of the scan is step (b). The working frequency corresponding to the maximum current peak value for each scan is used as a central working frequency. Increasing or decreasing the operating bandwidth distinguishes multi-order frequency bands and scans them to compare the maximum current peaks.