40KHZ 3000W Circuit Board PCB Ultrasonic Cleaning Generator Power Supply Driving Ultrasonic Transducer

The self-excited oscillation ultrasonic drive circuit is widely used in small cleaning machines, ultrasonic atomization humidifiers, and atomization fountains and other equipment. Currently, the commonly used ultrasonic generator circuit composition is divided into two categories: one is to generate ultrasonic oscillation using power switch tubes (such as commonly used BU407) and LC oscillators; Another type is to use a time base circuit 555 or inverter as the oscillation signal source, amplify and drive the power output stage, ฯลฯ

The self-excited oscillation ultrasonic drive circuit is simple, but its frequency stability is poor. Once the ultrasonic output power deviates from the natural resonance frequency of the ceramic transducer, the output ultrasonic mechanical oscillation frequency will rapidly decrease, and its control is also difficult. Generally, if the inherent electrode capacitance and resonance impedance of the ultrasonic transducer are used as feedback components in the self-excited oscillation circuit, automatic frequency tracking can be achieved. The biggest drawback of the second type of circuit is that:, Generally, frequency tracking cannot be achieved in simple circuits, and manual tracking is extremely inconvenient when the oscillation frequency changes

The self-excited oscillation driving circuit also includes a current control device connected between the driving device, self-excited driving winding, switching device, and the circuit formed by the sampling device to further control the switching device