Ultrasonic atomizer, and resonant-frequency determination method based on ultrasonic atomizer

An ultrasonic atomizer, comprising:

• a storage cavity, configured to store an atomization matrix;
• an ultrasonic atomization piece, configured to generate oscillation to atomize the atomization matrix;
• a control circuit and a power supply, wherein
• the control circuit comprises a controller, a driving branch, and an impedance branch;
• the driving branch comprises a power supply sub-branch, a switch sub-branch, a capacitive sub-branch, and a resonant sub-branch, wherein the power supply sub-branch is connected to the power supply, the power supply sub-branch is configured to generate direct current according to the power supply, the switch sub-branch is connected to each of the controller and the power supply sub-branch, the switch sub-branch is configured to be turned on or turned off in response to a first pulse signal output by the controller to generate a pulse voltage according to the direct current, the capacitive sub-branch is connected to the switch sub-branch, and the capacitive sub-branch is configured to implement soft turn-on or soft turn-off of the switch sub-branch, and the resonant sub-branch is connected to each of the power supply sub-branch, the switch sub-branch, and the impedance branch, and the resonant sub-branch is configured to resonate in response to turn-on and turn-off of the switch sub-branch to output a driving voltage according to the pulse voltage to drive the ultrasonic atomization piece;
• the impedance branch is connected between the driving branch and the ultrasonic atomization piece, and the impedance branch is configured to match a combined impedance of the impedance branch and the ultrasonic atomization piece with an impedance of the driving branch;
• and
• the controller is configured to obtain a voltage of the ultrasonic atomization piece, and determine a resonant frequency of the ultrasonic atomization piece according to the voltage of the ultrasonic atomization piece.

A resonant frequency determination method based on an ultrasonic atomizer, comprising:

• outputting N driving frequencies to drive an ultrasonic atomization piece in the ultrasonic atomizer, wherein N is an integer ≥2;
• obtaining detection signals corresponding to voltages of the ultrasonic atomization piece under an action of M driving frequencies of the N driving frequencies to obtain M detection signals, wherein 2≤M≤N;
• and
• determining a resonant frequency of the ultrasonic atomization piece according to a frequency corresponding to a minimum value of the voltage corresponding to the M detection signals.