Device comprising a piezoelectric transducer
US5361013A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jan 26, 1993 |
| Grant date | Nov 1, 1994 |
| Priority date | — |
| Expiry date | Jan 26, 2013 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF02D2041/2003
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
The device comprises a piezoelectric transducer, a primary battery, and a circuit which applies a control voltage to the transducer or which short-circuits the latter depending on the state of a control signal. The control voltage is produced by a voltage increasing circuit comprising a coil, a diode and a capacitor constituted by the transducer, that are connected in series, in that order, across the terminals of the primary battery, and an oscillator responsive to the control signal to control a transistor in such a manner that it either alternately produces and cancels a short circuit across the terminals of the circuit formed by the diode and the transducer or is permanently blocked. A second transistor is also responsive to the control signal to short-circuit the transducer when the first transistor is blocked. The device is simpler, cheaper and consumes less electrical power than known devices.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.