US 12,413,159 B2
Micro inverter and modulation method thereof
Zichen Wang, Hefei (CN); Yu Gu, Hefei (CN); Qiaodi Chen, Hefei (CN); Hao Wang, Hefei (CN); and Baoji Wang, Hefei (CN)
Assigned to Sungrow Power Supply Co., Ltd., Hefei (CN)
Filed by Sungrow Power Supply Co., Ltd., Hefei (CN)
Filed on Oct. 25, 2023, as Appl. No. 18/493,898.
Claims priority of application No. 202211594124.8 (CN), filed on Dec. 13, 2022.
Prior Publication US 2024/0195323 A1, Jun. 13, 2024
Int. Cl. H02M 7/5387 (2007.01); H02J 3/38 (2006.01); H02M 1/00 (2007.01); H02M 3/335 (2006.01)
CPC H02M 7/53871 (2013.01) [H02J 3/38 (2013.01); H02M 1/0043 (2021.05); H02M 3/33571 (2021.05); H02J 2300/24 (2020.01)] 12 Claims
OG exemplary drawing
 
1. A micro inverter, applied to a photovoltaic system, wherein the micro inverter comprises a filter, a transformer, and a switching circuit, and wherein:
the switching circuit comprises one or more first switching circuits and one second switching circuit;
each of the first switching circuits has an input terminal serving as an output terminal of a direct-current power supply, and is configured to convert a direct current into an alternating current and output the alternating current to the second switching circuit;
an output terminal of the second switching circuit is connected to a primary side of the transformer;
a secondary side of the transformer is connected to an input terminal of the filter,
an output terminal of the filter serves as an output terminal of the photovoltaic system; and
each of the first switching circuits is an H-bridge, the H-bridge comprises a leading arm and a lagging arm, a phase-shift angle between the leading arm and the lagging arm is an internal phase-shift angle, and a phase-shift angle between the leading arm and the second switching circuit is an external phase-shift angle.