US 12,021,409 B2
Photovoltaic electric appliance and charging control method, device and circuit thereof, and storage medium
Han Liu, Guangdong (CN); Ningning Chen, Guangdong (CN); Xuefen Zhang, Guangdong (CN); and Keqin Liu, Guangdong (CN)
Assigned to Gree Electric Appliances, Inc. of Zhuhai, Guangdong (CN)
Appl. No. 17/288,027
Filed by Gree Electric Appliances, Inc. of Zhuhai, Guangdong (CN)
PCT Filed Aug. 15, 2019, PCT No. PCT/CN2019/100798
§ 371(c)(1), (2) Date Apr. 23, 2021,
PCT Pub. No. WO2020/082860, PCT Pub. Date Apr. 30, 2020.
Claims priority of application No. 201811240912.0 (CN), filed on Oct. 24, 2018.
Prior Publication US 2021/0399573 A1, Dec. 23, 2021
Int. Cl. H02J 7/00 (2006.01); H02J 7/34 (2006.01); H02J 7/35 (2006.01)
CPC H02J 7/35 (2013.01) [H02J 7/0029 (2013.01); H02J 7/0047 (2013.01); H02J 7/00712 (2020.01); H02J 7/345 (2013.01); H02J 2207/50 (2020.01)] 17 Claims
OG exemplary drawing
 
1. A charging control circuit, comprising:
a dual relay circuit arranged between a grid side circuit and a machine side circuit of a photovoltaic electric appliance;
a charging relay circuit configured to be turned on to realize gradual charging of a bus capacitance in a case where the dual relay circuit is not turned on;
a first voltage detection device configured to detect a grid side voltage at a connection point between the grid side circuit and the dual relay circuit of the photovoltaic electric appliance;
a second voltage detection device configured to detect a machine side voltage at a connection point between the machine side circuit and the dual relay circuit of the photovoltaic electric appliance; and
a charging control device configured to perform at least one of the following steps;
controlling an on state and an off state of the charging relay circuit and the dual relay circuit according to the grid side voltage and the machine side voltage; and
determining a circuit failure type according to the grid side voltage and the machine side voltage.