| United States Patent | 5,589,805 |
| Zuraski, et. al. | Dec. 31, 1996 |
Enhanced resolution pulse width modulation control
| Inventors: | Zuraski; Jeffery A. (Saginaw, MI); Colosky; Mark P. (Vassar, MI). |
| Assignee: | General Motors Corporation (Detroit, MI). |
| Appl. No.: | 554,173 |
| Filed: | Nov. 6, 1995 |
| Intl. Cl. : | H03K 7/08 |
| U.S. Cl.: | 332/109; 318/599; 318/811; 375/238 |
| Current U.S. Class: | 332/109 |
| Field of Search: | 332/109, 110; 375/238; 318/599, 811 |
References Cited
U.S. Patent Documents
| 5,023,535 | Jun., 1991 | Miller et al. | 318/599 |
Primary Examiner: Grimm; Siegfried H.
Attorney, Agent or Firm: Cichosz; Vincent A.
Abstract
A pulse width modulation system provides for enhanced output resolution through software control. The pulse width modulation control system normally has a control period during which the pulse width modulation state assumes a predetermined one of a plurality of output states. The method herein toggles between two adjacent output states during any single control period to effectuate a resultant system response characteristic of a system having a greater number of available output states. Furthermore, certain preferred implementations may also suppress undesirable harmonic excitation of the system through quasi-random toggling.
5 Claims, 10 Drawing Figures
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