| Title |
A Study of the High Efficiency and Stability in Ultrasonic Generation circuit |
| Abstract |
The generation of the intensive ultrasonic waves depend mainly on the energy conversion efficiency depending on high frequency oscillation of the generator and the control performance of stable output depending on load variation, res pectively. In this dissertation, a new configuration of ultrasonic generator is specially proposed and designed for improving both efficiency and sta bility. The generating frequency is tunned by a PLL. which is controlled through the detection on phase difference between outputs and currents of the loads and the output amplitude of MOSFET, Q₁ are controlled by their products through the multiplier, which results in the control of the amplitude of voltage controlled oscillation. And finally, the proposed and designed ultrasonic gene rator is composed by the combination of the function in mentioned above. the analysis results of the proposed circuit shows a good agreement be tween simulations and experiments. |