Piezoelectric type ultrasonic transducer driving power

Abstract

The invention discloses a dielectric ultrasonic transducer driving power, comprising a main controller, a sampling circuit, an adjusting circuit and a driving circuit; the sampling circuit and the adjusting circuit gain signals from the dielectric ultrasonic transducer; the output terminal of the sampling circuit and the adjusting circuit is connected with the main controller which receives the signals emitted by external controls and is connected with the dielectric ultrasonic transducer by the driving circuit; the main controller comprises a phase demodulation unit, a control unit, a direct digital frequency synthesizer, an amplitude modulating and limiting unit; the phase demodulation unit is connected with the output signal of the sampling circuit; the phase demodulation unit, the control unit, the direct digital frequency synthesizer and the amplitude modulating and limiting unit are sequentially connected in series and subsequently output the signals to the driving circuit. Compared with ultrasonic powers based on DSP and other controllers, the driving power has the advantages of rapid phase locking speed, high precision, programmable adjustment of output power, etc.

Description

technical field [0001] The invention belongs to the field of electronic technology, and relates to a piezoelectric ultrasonic transducer driving power supply. Background technique [0002] The piezoelectric ultrasonic transducer and its driving power are the core components of thermosonic bonding equipment. Piezoelectric ultrasonic transducers include piezoelectric transducers, horns, and bonding tools. Among them, the piezoelectric transducer converts the ultrasonic frequency electrical signal into mechanical vibration of the same frequency through the electrostrictive effect, and the mechanical vibration is transmitted to the bonding tool through the horn, so that the bonding tool generates vibration of a certain amplitude. Vibration at ultrasonic frequencies promotes the formation of a clean surface between the two metals and mutual diffusion and welding together. [0003] In the thermosonic bonding equipment, the amplitude output of the piezoelectric ultrasonic transdu...

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Problems solved by technology

[0003] In the thermosonic bonding equipment, the amplitude output of the piezoelectric ultrasonic transducer directly affects the quality of the welding wire. To ensure the normal operation of the piezoelectric ultrasonic transducer, it must work in a resonant state, that is, the frequency of the excitation electrical signal The natural frequency of the piezoelectric ultrasonic transducer is the same as that of the piezoelectric ultrasonic transducer, but during the welding process, due to various reasons such as changes in the state of the bonding interface, changes in the damping and stiffness of the interface connection, disturbance, wear, and aging, the piezoelectric ultrasonic transducer The resonant frequency of the transducer is constantly changing. If the dynamic characteristics of the ultrasonic power supply are poor and the excitation frequency cannot be changed in time and accurately, the piezoelectric ultrasonic transducer will work in a detuned state and the output amplitude will be reduced, thereby reducing the bonding efficiency. and bond quality

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