US 12,395,096 B2
Micro inverter having multiple independent inputs, and photovoltaic system
Lu Zhang, Hefei (CN); Yu Gu, Hefei (CN); Linhai Zhao, Hefei (CN); and Qiaodi Chen, Hefei (CN)
Assigned to Sungrow Power Supply Co., Ltd., Hefei (CN)
Filed by Sungrow Power Supply Co., Ltd., Hefei (CN)
Filed on Oct. 10, 2023, as Appl. No. 18/484,261.
Claims priority of application No. 202222683536.0 (CN), filed on Oct. 12, 2022.
Prior Publication US 2024/0128890 A1, Apr. 18, 2024
Int. Cl. H02M 1/00 (2007.01); H02M 3/335 (2006.01); H02M 7/5387 (2007.01); H02M 7/797 (2006.01)
CPC H02M 7/5387 (2013.01) [H02M 1/0083 (2021.05); H02M 3/33573 (2021.05); H02M 3/33584 (2013.01); H02M 7/797 (2013.01)] 16 Claims
OG exemplary drawing
 
1. A micro inverter having a plurality of independent inputs, comprising one or more isolated DC-DC converters and a DC-AC converter, wherein:
each isolated DC-DC converter of the plurality of isolated DC-DC converters comprise an inverter H-bridge, a transformer, and a voltage-multiplying rectifier;
an input terminal of the inverter H-bridge is configured to connect to a direct-current power supply;
a secondary winding of the transformer is connected to an input terminal of the voltage-multiplying rectifier;
an output terminal of the voltage-multiplying rectifier is connected to an input terminal of the DC-AC converter;
a leakage inductor or an external inductor of the transformer forms series resonance along with a capacitor in the voltage-multiplying rectifier;
the voltage-multiplying rectifier comprises a switch arm and a capacitor arm, wherein the switch arm and the capacitor arm are connected in parallel;
two terminals of the secondary winding of the transformer are connected to an intermediate terminal in the switch arm and an intermediate terminal in the capacitor arm, respectively; and
the leakage inductor forms the series resonance along with the capacitor which is in the capacitor arm.