Ultrasonic transducer drive circuit
US4642581A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jun 21, 1985 |
| Grant date | Feb 10, 1987 |
| Priority date | — |
| Expiry date | Jun 21, 2005 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB06B2201/77
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A drive circuit for an ultrasonic atomizer comprising a switching mode power driver circuit and an oscillator circuit to drive the power driver circuit with a signal proportional to the phase response of the atomizer's transducer element so as to fix the frequency of the power delivered to the atomizer at the frequency of the transducer. The oscillator circuit has an oscillator which generates and supplies said drive signal, an integrated circuit phase-locked loop in a feedback loop arrangement to detect the transducer's phase response and signal the oscillator to shift its drive signal frequency to the transducer's frequency and a second order low pass filter to control the rate of the oscillator frequency shift.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.