US 12,379,427 B2
Electrical apparatus and refrigeration cycler
Haruka Matsuo, Tokyo (JP); and Koichi Arisawa, Tokyo (JP)
Assigned to Mitsubishi Electric Corporation, Tokyo (JP)
Appl. No. 18/580,441
Filed by Mitsubishi Electric Corporation, Tokyo (JP)
PCT Filed Feb. 21, 2023, PCT No. PCT/JP2023/006247
§ 371(c)(1), (2) Date Jan. 18, 2024,
PCT Pub. No. WO2024/176355, PCT Pub. Date Aug. 29, 2024.
Prior Publication US 2025/0076406 A1, Mar. 6, 2025
Int. Cl. G01R 31/52 (2020.01); G01R 31/67 (2020.01)
CPC G01R 31/52 (2020.01) [G01R 31/67 (2020.01)] 9 Claims
OG exemplary drawing
 
1. An electrical apparatus having a function of sensing whether a ground wire, which connects a terminal block and a midpoint of a power supply, is connected or not, the electrical apparatus comprising:
a substrate on which circuit components, including an inverter circuit, of a power converter configured to perform power conversion are mounted, and to which a power supply voltage is applied from the power supply;
a housing configured to accommodate the substrate;
a detector configured to detect a physical quantity correlated with a common mode current, the common mode current flowing to circulate through at least two of the power supply, the substrate, and the housing by power generated by the inverter circuit of the power converter; and
a sensor configured to sense whether the ground wire is connected or not, on a basis of a value detected by the detector, wherein
the ground wire is an electrical wire adapted and configured to be installed when an installer performs wiring work.