Method and apparatus for regulating current for programmable logic controllers
US6978386B2 · kind B2 · utility
3Cited by
12References
27Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 28, 2000 |
| Grant date | Dec 20, 2005 |
| Priority date | — |
| Expiry date | Jan 30, 2023 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG05B2219/42237
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A method for reducing thermal dissipation in a single PLC package includes implementing a pulse width modulated current regulator including a field effect transistor (FET) switch, and utilizing a turn on delay of the FET to provide a wide operating range of current. The FET has an inherent turn-on time delay that can be exploited such that, as the duty cycle is reduced, the FET's drain to source impedance dominates an inductive path of an output filter and increases output filtering.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.