I-Chen Ma,Jung-Yu Lin,Yang-Sheng Sun,Sheng-Wen Pai
申请号：
US14689805
公开号：
US20160067427A1
申请日:
2015.04.17
申请国别(地区):
US
年份:
2016
代理人:
摘要：
A 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 selectively provides electric power to the nebulizing circuit so as to power the nebulizing circuit. A harmonic signal generated by the piezoelectric actuator at a working frequency is sampled by the sampling circuit. A specified frequency of the harmonic signal is retrieved by the filtering circuit. The controlling circuit controls 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.
