Patent Application
20160067427
The present invention relates to a nebulizer and a controlling method of the nebulizer, and more particularly to a nebulizer and a controlling method of the nebulizer for precisely judging whether the liquid of the nebulizer is exhausted.
The applications of nebulizers are very extensive. For example, the nebulizers may be used to spray environments, moisturize skin or administer medicament. Generally, the nebulizer may be used to nebulize the liquid into mist droplets. Under this circumstance, since the contact area between the liquid and the contacted object is increased, the liquid is easily moisturized or easily absorbed.
Conventionally, the nebulizer uses pressurize gas to nebulize the liquid into mist droplets. With increasing development of science and technology, the nebulizer is developed in view of miniaturization and power-saving efficacy so as to increase the operating efficiency and reduce the occupied space. Consequently, a nebulizer with a piezoelectric actuator made of piezoelectric material has been introduced into the market. In the piezoelectric type nebulizer, the piezoelectric actuator vibrates to nebulize the liquid into mist droplets. Since the piezoelectric type nebulizer has the small-sized and power-saving efficacy, the piezoelectric type nebulizer is gradually adopted in many applications.
However, since the conventional piezoelectric type nebulizer has no mechanism for detecting whether the inner liquid is exhausted, some problems may occur. For example, if the inner liquid is exhausted during operation of the conventional piezoelectric type nebulizer, the conventional piezoelectric type nebulizer is still operated. That is, even if the inner liquid is exhausted, the piezoelectric type nebulizer is not disabled. Since the conventional piezoelectric type nebulizer continuously consume electricity, the problem of wasting electric energy occurs. For solving these problems, a piezoelectric type nebulizer with an automatic power-off function is disclosed. If a detecting unit detects that the inner liquid is exhausted, the piezoelectric type nebulizer is automatically powered off. However, the detecting result of the detecting unit is easily interfered by some factors. For example, the noise generated by the electronic components of the nebulizer may disturb the detecting result. If the detecting unit fails to accurately detect the exhausted status of the inner liquid, the automatic power-off function is not accurately implemented. In other words, the power-saving efficacy of the piezoelectric is impaired.
Therefore, there is a need of providing a nebulizer and a controlling method thereof in order to overcome the above drawbacks.
The present invention provides a nebulizer and a controlling method thereof. By means of a filtering circuit, a specified frequency a harmonic signal generated by a piezoelectric actuator is retrieved. According to the specified frequency, the controlling unit can precisely judge whether the liquid of the nebulizer is exhausted. Once the liquid is exhausted, the power circuit stops providing electric power to the nebulizing circuit. Consequently, the power consumption of the nebulizer is reduced.
In accordance with an aspect of the present invention, there is provided a nebulizer for nebulizing a liquid. The nebulizer includes a nebulizing circuit, a power circuit, a sampling circuit, a filtering circuit and a controlling circuit. The nebulizing circuit includes a piezoelectric actuator. During operation of the piezoelectric actuator, the liquid is nebulized. The power circuit is electrically connected with the nebulizing circuit for selectively providing electric power to the nebulizing circuit so as to power the nebulizing circuit. The sampling circuit is electrically connected with the nebulizing circuit. A harmonic signal generated by the piezoelectric actuator at a working frequency is sampled by the sampling circuit. The filtering circuit is electrically connected with the sampling circuit. A specified frequency of the harmonic signal is retrieved by the filtering circuit. The controlling circuit is electrically connected with the power circuit and the filtering circuit for controlling operations of the power circuit and receiving the specified frequency of the harmonic signal. By comparing the specified frequency with a predetermined frequency, the controlling circuit judges whether the liquid is exhausted. Once the liquid is exhausted, the controlling circuit controls the power circuit to stop providing the electric power to the nebulizing circuit.
In accordance with another aspect of the present invention, there is provided a controlling method of a nebulizer. The nebulizer includes a nebulizing circuit and a power circuit. The nebulizing circuit includes a piezoelectric actuator for nebulizing a liquid. The power circuit selectively provides electric power to the nebulizing circuit. In a step (a), the nebulizer is turned on, so that the power circuit provides the electric power to the nebulizing circuit. In a step (b), a specified frequency of a harmonic signal generated by the piezoelectric actuator at a working frequency is retrieved. A step (c) is performed to judge whether the liquid is exhausted by comparing the specified frequency with a predetermined frequency. In a step (d), if a result of the step (c) indicates that the liquid is exhausted, the electric power is not provided to the nebulizing circuit.
In accordance with a further aspect of the present invention, there is provided a controlling method of a nebulizer. The nebulizer includes a nebulizing circuit and a power circuit. The nebulizing circuit includes a piezoelectric actuator for nebulizing a liquid. The power circuit selectively provides electric power to the nebulizing circuit. In a step (a), the nebulizer is turned on, so that the power circuit provides the electric power to the nebulizing circuit. In a step (b), a specified frequency of a harmonic signal generated by the piezoelectric actuator at a working frequency is retrieved. A step (c) is performed to judge whether the liquid is exhausted by comparing the specified frequency with a predetermined frequency. In a step (d), if the result of the step (c) indicates that the liquid is exhausted, a counting value is added by 1. A step (e) is performed to judge whether the counting value is equal to a predetermined value. In a step (f), if a result of the step (e) indicates that the counting value is equal to the predetermined value, the electric power is provided to the nebulizing circuit.
The above contents of the present invention will become more readily apparent to those ordinarily skilled in the art after reviewing the following detailed description and accompanying drawings, in which:
The present invention will now be described more specifically with reference to the following embodiments. It is to be noted that the following descriptions of preferred embodiments of this invention are presented herein for purpose of illustration and description only. It is not intended to be exhaustive or to be limited to the precise form disclosed.
In this embodiment, the piezoelectric actuator 100 has composite impedance properties of a capacitor, a resistor and an inductor. Consequently, when the piezoelectric actuator 100 is operated at the working frequency, a harmonic signal is generated because of a resonant effect of the capacitor and the inductor. There is a frequency shift between the frequency of the harmonic signal corresponding to the presence of the liquid and the frequency of the harmonic signal corresponding to the absence of the liquid. Moreover, the working frequency of the piezoelectric actuator 100 may be fixed or varied.
The power circuit 11 is electrically connected with the nebulizing circuit 10 for selectively providing electric power to the nebulizing circuit 10 in order to power the nebulizing circuit 10 and the piezoelectric actuator 100. In an embodiment, the power circuit 11 may receive utility power and convert the utility power into the electric power. In some other embodiments, the power circuit 11 may receive storage power from a battery and convert the storage power into the electric power.
The sampling circuit 12 is electrically connected with the nebulizing circuit 10. The harmonic signal generated by the piezoelectric actuator 100 at the working frequency is sampled by the sampling circuit 12. The filtering circuit 13 is electrically connected with the sampling circuit 12. A specified frequency of the harmonic signal is retrieved by the filtering circuit 13.
The controlling circuit 14 is electrically connected with the power circuit 11 and the filtering circuit 13 for controlling operations of the power circuit 11. Moreover, the specified frequency of the harmonic signal is received by the controlling circuit 14. By comparing the specified frequency with a predetermined frequency stored in the controlling circuit 14, the controlling circuit 14 may judge whether the liquid is exhausted. Once the liquid is exhausted, the power circuit 11 stops providing electric power to the nebulizing circuit 10. Consequently, the power consumption of the nebulizer 1 is reduced.
As mentioned above, there is a frequency shift between the frequency of the harmonic signal corresponding to the presence of the liquid and the frequency of the harmonic signal corresponding to the absence of the liquid. In this embodiment, the frequency of the harmonic signal corresponding to the absence of the liquid may be set as the predetermined frequency of the controlling circuit 14. Consequently, by comparing the specified frequency with the predetermined frequency, the controlling circuit 14 may judge whether the liquid is exhausted and perform a corresponding controlling action. Moreover, the harmonic signal generated by the piezoelectric actuator 100 not only contains the signal component indicating whether the liquid is exhausted but also contains other signal components about the operations of other electronic components of the nebulizer 1. Consequently, by means of the filtering circuit 13, the specified frequency of the signal component of the harmonic signal generated by the piezoelectric actuator 100 to indicate whether the liquid is exhausted will be retrieved. Under this circumstance, the nebulizer 1 can precisely judge whether the liquid is exhausted. Once the liquid is exhausted, the power circuit 11 stops providing electric power to the nebulizing circuit 10. Consequently, the power consumption of the nebulizer 1 is reduced.
In some embodiments, the type of the filtering circuit 13 may be determined according to the range of the specified frequency to be retrieved. For example, the filtering circuit 13 is a high-pass filtering circuit, a band-pass filtering circuit or a low-pass filtering circuit. Moreover, if the specified frequency of the harmonic signal generated by the piezoelectric actuator 100 is higher, the signal component of the harmonic signal corresponding to the specified frequency can indicate whether the liquid is exhausted more precisely. Consequently, it is preferred that the filtering circuit 13 is a high-pass filtering circuit. Under this circumstance, the specified frequency of the harmonic signal retrieved by the filtering circuit 13 is the higher-order harmonic frequency (e.g. 100 kHz˜1 MHz).
Please refer to
In some situations, the controlling circuit 14 may erroneously judge that the liquid of the nebulizer 1 is exhausted. For example, if the nebulizer 1 is accidently shaken, the liquid within the nebulizer 1 flows along multiple directions. Under this circumstance, the frequency of the harmonic signal generated by the piezoelectric actuator 100 is temporarily changed. Once the specified frequency is equal to the predetermined frequency in a short time, the controlling circuit 14 may erroneously judge that the liquid of the nebulizer 1 is exhausted and thus the controlling circuit 14 may control the power circuit 11 to stop providing the electric power to the nebulizing circuit 10. For avoiding misjudgment, the controlling method of the present invention may be further modified. For example, in another embodiment, the controlling circuit 14 further stores a counting value. When the controlling unit 14 judges that the liquid is exhausted by comparing the specified frequency with the predetermined frequency, the counting value is added by 1. Then, the controlling unit 14 judges whether the counting value is equal to a predetermined value. If the counting value is not equal to a predetermined value, the controlling unit 14 still controls the power circuit 11 to provide the electric power to the nebulizing circuit 10. Once the counting value is equal to a predetermined value, it means that the controlling unit 14 has judges the absence of the liquid many times. Under this circumstance, the controlling circuit 14 may control the power circuit 11 to stop providing the electric power to the nebulizing circuit 10. Moreover, once the counting value is equal to a predetermined value, the counting value is zeroed by the controlling unit 14.
In some embodiments, while nebulizer 1 is turned on and the power circuit 14 provides the electric power to the nebulizing circuit 10 (i.e. in the step S20), the controlling circuit 14 also controls the illuminating circuit 15 to continuously emit a light beam. Moreover, while the controlling circuit 14 controls the power circuit 11 to stop providing the electric power to the nebulizing circuit 10 (i.e. in the step S23), the controlling circuit 14 controls the illuminating circuit 15 to intermittently emit the light beam. The intermittent illumination of the light beam may notify the user that the liquid of the nebulizer 1 is exhausted. Under this circumstance, the user may replenish the nebulizer 1 with the liquid.
In some embodiments, while nebulizer 1 is turned on and the power circuit 14 provides the electric power to the nebulizing circuit 10 (i.e. in the step S30), the controlling circuit 14 also controls the illuminating circuit 15 to continuously emit a light beam. Moreover, while the controlling circuit 14 controls the power circuit 11 to stop providing the electric power to the nebulizing circuit 10 (i.e. in the step S35), the controlling circuit 14 controls the illuminating circuit 15 to intermittently emit the light beam. The intermittent illumination of the light beam may notify the user that the liquid of the nebulizer 1 is exhausted. Under this circumstance, the user may replenish the nebulizer 1 with the liquid.
From the above descriptions, the present invention provides a nebulizer and a controlling method thereof. The nebulizer comprises a nebulizing circuit, a power circuit, a sampling circuit, a filtering circuit and a controlling circuit. By means of the filtering circuit, the specified frequency the harmonic signal generated by the piezoelectric actuator is retrieved. According to the specified frequency, the controlling unit can precisely judge whether the liquid of the nebulizer is exhausted. Once the liquid is exhausted, the power circuit stops providing electric power to the nebulizing circuit. Consequently, the power consumption of the nebulizer is reduced. Moreover, the controlling circuit further stores a counting value. When the controlling unit judges the liquid is exhausted by comparing the specified frequency with the predetermined frequency, the counting value is added by 1. Once the counting value is equal to a predetermined value, the controlling circuit controls the power circuit to stop providing the electric power to the nebulizing circuit. Consequently, the problem caused by misjudgment will be overcome.
While the invention has been described in terms of what is presently considered to be the most practical and preferred embodiments, it is to be understood that the invention needs not be limited to the disclosed embodiment. On the contrary, it is intended to cover various modifications and similar arrangements included within the spirit and scope of the appended claims which are to be accorded with the broadest interpretation so as to encompass all such modifications and similar structures.
| Number | Date | Country | Kind |
|---|---|---|---|
| 103130714 | Sep 2014 | TW | national |
