Fine tuned pulse width modulation
US7932761B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Feb 9, 2009 |
| Grant date | Apr 26, 2011 |
| Priority date | — |
| Expiry date | Apr 3, 2029 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03K7/08
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
Techniques and an apparatus for producing pulse width modulation (PWM) edges are described. A PWM controller circuit with a polyphase counter is described. The polyphase counter may comprise a plurality of counters. Each of the counters may be set to a specific initial count value. A polyphase decoder block with a plurality of sets of high/low decoders are coupled to outputs from the polyphase counter. A set/reset block with a plurality of set/reset logic elements is coupled to outputs from the polyphase decoder block. A serializer is coupled to outputs from the plurality of set/reset blocks to generate PWM edges. Multiple parallel phases of a PWM pulse may be created with the circuit. Using a polyphase counter and comparator to create multiple parallel phases may speed up the controller circuit and provide a finer tuning resolution.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.