US 11,984,819 B2
Power conversion circuit, inverter, and control method
Zhaohui Wang, Nuremberg (DE); Lei Shi, Shanghai (CN); and Dong Chen, Shanghai (CN)
Assigned to Huawei Digital Power Technologies Co., Ltd., Shenzhen (CN)
Filed by Huawei Digital Power Technologies Co., Ltd., Shenzhen (CN)
Filed on Oct. 6, 2021, as Appl. No. 17/495,117.
Application 17/495,117 is a continuation of application No. PCT/CN2019/126910, filed on Dec. 20, 2019.
Claims priority of application No. 201910310890.9 (CN), filed on Apr. 17, 2019.
Prior Publication US 2022/0029555 A1, Jan. 27, 2022
Int. Cl. H02J 3/38 (2006.01); H02M 1/12 (2006.01); H02M 1/14 (2006.01); H02M 7/5387 (2007.01)
CPC H02M 7/53871 (2013.01) [H02J 3/381 (2013.01); H02M 1/123 (2021.05); H02M 1/14 (2013.01); H02J 2300/24 (2020.01)] 16 Claims
OG exemplary drawing
 
12. A photovoltaic power generation system, comprising:
a photovoltaic panel configured to convert light energy into a direct current;
an inverter configured to convert the direct current into an alternating current; and
an alternating current network configured to transmit the alternating current, wherein the photovoltaic panel is connected to the inverter, and the inverter is connected to the alternating current network; the inverter comprises the power conversion circuit; wherein the power conversion circuit comprises:
a switching network,
a control circuit configured to control the switching network by using either a first sine modulated wave with a first carrier or a second sine modulated wave with a second carrier,
a filter circuit comprising a first power inductor comprising a first winding and a second winding, a common mode choke comprising a third winding and a fourth winding, a first differential mode filter capacitor, a first common mode filter capacitor, and a second common mode filter capacitor,
a direct current side circuit, and
an alternating current side circuit, wherein the switching network is connected to the direct current side circuit, the switching network is connected to the control circuit, the switching network is connected to the filter circuit, and the filter circuit is connected to the alternating current side circuit; the control circuit is configured to control the switching network;
both a first end of the first winding and a first end of the second winding are separately connected to the switching network, a second end of the first winding is connected to a first end of the third winding, and a second end of the second winding is connected to a first end of the fourth winding; and two ends of the first differential mode filter capacitor are respectively connected to the second end of the first winding and the second end of the second winding, wherein hybrid modulation using both unipolar modulation and bipolar modulation is employed to reduce the common mode choke.