US 12,255,528 B2
Multi-level, jittering, DC to AC inverter with low pass filter
Paul Wilkinson Dent, Pittsboro, NC (US)
Assigned to Koolbridge Solar, Inc., Wrightsville Beach, NC (US)
Filed by Koolbridge Solar, Inc., Wrightsville Beach, NC (US)
Filed on Oct. 11, 2023, as Appl. No. 18/378,910.
Application 18/378,910 is a division of application No. 16/559,326, filed on Sep. 3, 2019, granted, now 11,791,711.
Application 16/559,326 is a continuation of application No. 16/233,556, filed on Dec. 27, 2018, granted, now 10,666,161, issued on May 26, 2020.
Application 16/233,556 is a continuation of application No. 14/749,339, filed on Jun. 24, 2015, granted, now 10,205,324, issued on Feb. 12, 2019.
Application 14/749,339 is a continuation of application No. 14/062,884, filed on Oct. 24, 2013, granted, now 9,735,703, issued on Aug. 15, 2017.
Application 14/062,884 is a continuation of application No. 13/103,070, filed on May 8, 2011, granted, now 8,937,822, issued on Jan. 20, 2015.
Prior Publication US 2024/0048045 A1, Feb. 8, 2024
Int. Cl. H02M 1/32 (2007.01); H02H 3/16 (2006.01); H02J 3/00 (2006.01); H02J 3/38 (2006.01); H02J 7/00 (2006.01); H02J 7/35 (2006.01); H02J 9/06 (2006.01); H02M 1/36 (2007.01); H02M 7/537 (2006.01); H02M 7/5387 (2007.01)
CPC H02M 1/32 (2013.01) [H02J 3/00 (2013.01); H02J 3/007 (2020.01); H02J 3/38 (2013.01); H02J 3/388 (2020.01); H02J 7/0068 (2013.01); H02J 7/35 (2013.01); H02J 9/061 (2013.01); H02M 1/36 (2013.01); H02M 7/537 (2013.01); H02M 7/53871 (2013.01); H02H 3/16 (2013.01); H02J 2300/00 (2020.01); H02J 2300/22 (2020.01); Y02A 30/00 (2018.01); Y02B 10/10 (2013.01); Y02E 10/56 (2013.01)] 26 Claims
OG exemplary drawing
 
1. A DC to AC inverter, comprising:
circuitry configured to define a plurality of different voltage levels, wherein each level is defined by lower and upper voltage values;
a jittering controller configured to jitter between the lower and upper voltage values in each level to generate a number N of preliminary AC waveforms, each having mean values between the lower and upper voltage values within each level;
one or more AC output filters, each configured to receive a preliminary AC waveform and to remove the jittering and provide a smooth output AC waveform; and
positive and negative DC input terminals to receive DC power, and wherein the inverter is configured to cause the positive and negative DC input terminals to vary alike in voltage according to a common mode waveform while maintaining a substantially constant differential voltage between them, the variation in voltage having substantially the same common waveform on both the positive and negative DC input terminals and transitioning between a greatest negative and a greatest positive value at a frequency equal to N times the output AC waveform frequency.