Drive circuits for a piezoelectric stack
US4109174A · kind A · utility
58Cited by
4References
16Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Feb 4, 1977 |
| Grant date | Aug 22, 1978 |
| Priority date | — |
| Expiry date | Feb 4, 1997 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB06B2201/55
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A drive circuit for a piezo-electric crystal stack comprises an inductor, a first circuit including a diode and a transistor through which the inductor can be connected to a pair of d.c. supply terminals, the first circuit including a switch operable to reduce the current flow through the inductor, a second curcuit including a diode through which energy from the inductor is transferred to the stack of crystals when the current flow through the inductor is reduced. The drive circuit also includes means for transferring energy from the stack of crystals to the inductor when it is required to increase current flow in the inductor.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.