Patent ID: 7673812

Claim:
A portable ultrasonic nebulizer apparatus for automatically adjusting an operation frequency of the apparatus corresponding to a resonant frequency, comprising: a power supply for supplying power; a vibrating element to vibrate a liquid to form an aerosol of fine droplets; a variable oscillator for providing a plurality of frequencies to the vibrating element so as to let the vibrating element vibrates at the plurality of frequencies; a step-up converter electrically connected with the variable oscillator for converting an input voltage to a boosted voltage to the vibrating element; a current detecting element positioned between the power supply and the vibrating element for detecting a plurality of electrical current values passing before the vibrating element, the value being respectively related to each of the plurality of frequencies; and a microprocessor for receiving the plurality of electrical current values related to each of the plurality of frequencies so as to determine the resonant frequency at which the electrical current is a maximum value and adjusting the operation frequency of the vibrating element provided by the variable oscillator corresponding to the resonant frequency.