**4. Conclusions**

In this paper, a non-resonant piezoelectric current sensing device with high resolution is proposed, which possesses the advantages of passivity, low cost, and simple structure. The device can operate non-invasively for a two-wire power cord carrying opposite currents. The sensitivity of the structure is improved due to the force amplification effect of the cymbal structure and the concentration effect of the permalloy plate. A theoretical model has been developed and validated by the experiments. A large current sensitivity of 12.74 mV/A (*d* = 0 mm) and a high linearity of 0.67% (*d* = 3 mm) are obtained. The experimental current-to-voltage results demonstrate the potential of a large magnetoelectric effect of the proposed piezoelectric device at low-frequency applications.

**Author Contributions:** W.H. performed the analysis and the experiments; A.Y analyzed the experimental results; W.H. wrote the paper; all authors reviewed the manuscript.

**Funding:** This work is supported by the National Natural Science Foundation of China (Grant Nos. 61761001 and 61540039) and the Natural Science Foundation of Guangxi Province (Grant No. 2015GXNSFBA139263).

**Conflicts of Interest:** The authors declare no conflicts of interest.
