Title:
SPREAD SPECTRUM FOR SWITCH MODE POWER SUPPLIES
Document Type and Number:
WIPO Patent Application WO/2016/148883
Kind Code:
A3
Abstract:
A switch mode power supply may utilize a switching signal to control one or more power switches in the switch mode power supply. A switch mode power supply controller may generate and/or control this switching signal. The controller may reduce the peak spectral noise of the switch mode power supply by varying the instantaneous switching frequency at a constant slew rate magnitude that changes sign at random times. The instantaneous switching frequency may be controlled by a signal that is generated by integrating a random bit stream. The stream may repeat at a sub-audio frequency. The integrator may be lossy, so that the output does not wonder off to an arbitrary value. The frequency modulation signal may be filtered by a low pass filter.
Inventors:
ENGELHARDT MICHAEL THOMAS (US)
Application Number:
PCT/US2016/020022
Publication Date:
October 27, 2016
Filing Date:
February 29, 2016
Export Citation:
Assignee:
LINEAR TECH CORP (US)
International Classes:
H02M1/44; H02P1/00; H03L7/00
Foreign References:
| US7362191B2 | 2008-04-22 | |||
| US20050168290A1 | 2005-08-04 |
Attorney, Agent or Firm:
BECKER, Stephen A. (500 North Capitol Street N.W, Washington District of Columbia, US)
Download PDF:
Previous Patent: IMPROVED NEEDLE SCRIBE AT TIP
Next Patent: PROTECTIVE FILMS, BLENDS, AND METHODS OF MAKING THEREOF
Next Patent: PROTECTIVE FILMS, BLENDS, AND METHODS OF MAKING THEREOF