Integrated Design and Optimization of SSPC Current Measurement Module Based on AMR

With the development of aircraft power supply and distribution system to high power density, it is urgent for its core component, solid state power controller (SSPC), to realize current measurement integration to ensure reliable current monitoring and fault protection of high-power DC SSPC integrated modules. However, a large amount of losses and heat caused by the traditional current detection method based on shunts will reduce efficiency and reliability of SSPC with high current. To address the issue, this paper proposes a high-precision, high-linearity, fast-response, wide-range, and compact anisotropic magnetoresistance (AMR) current detection component integrated in the SSPC module. In order to eliminate the electromagnetic interference caused by other current paths of SSPC integrated module, a magnetic shield is proposed, and its feasibility and effectiveness are verified by electromagnetic simulation. The performance of the detection component was verified on a SSPC module prototype with a direct current rating of 540V /200A, showing detection accuracy of less than 1% and excellent linearity and response speed.