Design of a new program-controlled multi-frequency atomization circuit

Abstract

Aiming at the problems of difficult adjustment of resonant frequency and difficult debugging in traditional atomizing circuit, a new atomizing circuit with multi-frequency and multi-circuit controlled by program is designed.The circuit uses STM32 as the main controller, and generates a frequency-adjustable external driving signal by frequency synthesizer based on AD9833 programming.The switching function of the MOS tube is driven to control the input of the external signal, so as to excite the oscillator oscillation.Sampling feedback circuit is used to find the optimum resonant frequency, which improves the stability of atomization circuit, realizes the real-time frequency adjustment, simplifies the circuit structure and reduces the difficulty of debugging.

Keywords

• ultrasonic atomization
• signal generator
• ampling feedback
• optimum resonance