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The ultrasonic welding generator. it convert electrical energy into high-frequency alternating current signals that match the ultrasonic transducer. From the amplifying circuit form, a linear amplifying circuit and a switching power supply circuit can be used. In terms of conversion efficiency, a high-power ultrasonic power supply generally adopts a circuit form of a switching power supply. Linear power supply also has its unique application range. Its advantage is that it can not strictly require circuit matching, allowing continuous and rapid changes in operating frequency. From the perspective of the ultrasound industry, ultrasound is mainly divided into self-excited and self-excited power supplies.
The principle of the ultrasonic power supply is that the signal generator first generates a specific frequency
signal. This signal can be a sinusoidal signal or a pulse signal.
This specific frequency is the frequency of the transducer. It is
generally used in ultrasonic welding equipment.
A relatively complete ultrasonic power supply should also have a
feedback link, which mainly provides feedback signals in two
aspects: the first is to provide an output power signal. We know
that when the power supply (voltage) of the generator changes. The
output power of the generator will also change. At this time, the
mechanical vibration is reflected on the transducer, which causes
the cleaning effect to be unstable. Therefore, the output power
needs to be stabilized, and the power amplifier is adjusted
accordingly through the power feedback signal, so that the power
amplification is stable.
The second is to provide a frequency tracking signal. When the
transducer works at the resonance frequency, it has the highest
efficiency and the most stable operation. The resonance frequency
of the transducer will change due to assembly reasons and work
aging. Of course, the frequency of this change is only drift, and
the change is not large. The frequency tracking signal can control
the signal generator, so that the frequency of the signal generator
can track the resonance frequency point of the transducer within a
certain range. Let the generator work at its best. Of course, with
the development of modern electronic ultrasound technology,
especially the microprocessor (uP) and signal processor (DSP), the
function of the generator is getting more and more powerful, but no
matter how it changes, its core function should be as described
above The content is just that the ultrasonic technology of each
part is different.