Drive circuit for magnetic bubble device
US4247911A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 11, 1979 |
| Grant date | Jan 27, 1981 |
| Priority date | — |
| Expiry date | Apr 11, 1999 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11C19/085
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
The present invention provides an improved method and apparatus for driving a magnetic bubble device, in which a d-c voltage supply and drive coils are connected to a bridge circuit consisting of four bi-directional switches, and alternating currents with steps (such as currents consisting of triangular waves or trapezoidal waves) are produced in the drive coils by suitably controlling the turn on or off of the bi-directional switches. As a result, the d-c level in the alternating current is not shifted by the variation in width of pulses which control the opening and closing of the bi-directional switches, and the magnetic bubble device is provided with a greatly improved operation margin.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.