US 12,395,122 B2
Multi-input shutdown device and control method therefor, and photovoltaic power generation system
Hongbin Yu, Hangzhou (CN); Yanliang Cai, Hangzhou (CN); Qiang Rong, Hangzhou (CN); Yi Zhao, Hangzhou (CN); and Bo Yang, Hangzhou (CN)
Assigned to HOYMILES POWER ELECTRONICS INC., Hangzhou (CN)
Appl. No. 18/719,025
Filed by HOYMILES POWER ELECTRONICS INC., Hangzhou (CN)
PCT Filed Mar. 31, 2022, PCT No. PCT/CN2022/084356
§ 371(c)(1), (2) Date Jun. 12, 2024,
PCT Pub. No. WO2023/134027, PCT Pub. Date Jul. 20, 2023.
Claims priority of application No. 202210036769.3 (CN), filed on Jan. 13, 2022.
Prior Publication US 2025/0055415 A1, Feb. 13, 2025
Int. Cl. H02S 40/30 (2014.01); H02H 7/20 (2006.01); H02S 50/10 (2014.01)
CPC H02S 40/30 (2014.12) [H02H 7/20 (2013.01); H02S 50/10 (2014.12)] 20 Claims
OG exemplary drawing
 
1. A multi-input shutdown device, wherein the shutdown device comprises:
a first input port, configured to be coupled to a first photovoltaic unit, wherein the first photovoltaic unit comprises at least one cell substring and a freewheeling diode connected in parallel to the cell substring;
at least one second input port, configured to be coupled to a second photovoltaic unit, wherein the second photovoltaic unit comprises at least one cell substring and a freewheeling diode connected in parallel to the cell substring;
a first shutdown module, coupled to the first input port, wherein the first shutdown module comprises a first switching device and a first bypass device, the first switching device is configured to control a connection between the first photovoltaic unit and a power bus, and the first bypass device is configured to provide a bypass path for a power bus current when the first photovoltaic unit is abnormal;
at least one second shutdown module, coupled to the second input port, wherein the second shutdown module comprises a second switching device;
a control module, powered from the first input port, configured to control the first switching device and the second switching device respectively based on a monitoring signal and a communication signal; and
an output port, configured to be coupled to the power bus, wherein outputs of the first shutdown module and the second shutdown module are connected in series to the output port; and
the control module controls the second switching device to be turned on when the second photovoltaic unit is abnormal, so that the second switching device and the freewheeling diode in parallel with the cell substring in the second photovoltaic unit provide a bypass path for the power bus current.