Hybrid digital pulse width modulation (PWM) based on phases of a system clock
US9438219B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 22, 2011 |
| Grant date | Sep 6, 2016 |
| Priority date | — |
| Expiry date | May 26, 2032 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02M3/157
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
Pulse width modulation (PWM) based on selectable phases of a system clock may be implemented with respect to leading-edge-modulation (LEM), trailing-edge-modulation (TEM), and/or dual-edge-modulation. An initial pulse may be generated based on a duty command, synchronous with the system clock, and may be registered with a D flip-flop under control of a selected phase of the system clock. Alternatively, a target count may be derived from the duty command, and an edge of the PWM pulse may be initiated when a count of the selected phase equals the target count. The pulse edge may be registered by a D flip-flop to a SR flip-flop under control of the selected phase. The phases of the system clock may be shared amongst multiple systems to generate multiple PWM signals. A system may include a DLL and digital logic, which may consist essentially of combinational logic and registers.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.