Control circuits for piezo electric transducers
US3989963A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 28, 1975 |
| Grant date | Nov 2, 1976 |
| Priority date | — |
| Expiry date | May 28, 1995 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S367/903
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A control circuit for cyclically operating one or more piezoelectric transducers to transmit and receive ultrasonic signals is disclosed. The circuit comprises a power transistor in series with an induction coil and controlled by a timing circuit to conduct for a short time during each cycle. As the power transistor cuts off a high voltage pulse is generated by the induction coil and this is fed via a zener diode as the transmission signal to the or each piezoelectric transducer across which is connected a switching circuit comprising a potential divider and a pair of opposite polarity diodes which automatically feed off the high voltage transmission signal to earth and pass low strength received signals to an amplifier.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.