Piezoelectric or similar transducer device with an oscillating circuit excitable by a control circuit
US6194810A · kind A · utility
2Cited by
3References
7Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Feb 1, 2000 |
| Grant date | Feb 27, 2001 |
| Priority date | — |
| Expiry date | Feb 1, 2020 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH10N30/802
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
The control circuit 12 generates an alternating voltage Ve through a flip-flop 13, preferably with inverter switches laid out in H form, in order to excite the oscillating circuit 11. The voltage Ve is made synchronous with the current i that passes through the transducer by means of a phasing device 14 that comprises 2 transistors T1, T2 coupled through their basis to an output 13b from the flip-flop and through their emitters to a terminal of the oscillating circuit. The link of the transducer with its control circuit is made using two wires only.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.