Customized Test Fixture for Accurate Impedance Measurement of EMI Filtering Chokes

Accurate measurement of electromagnetic interference (EMI) filter components provide reliable estimation of filter performance in power electronics applications. This paper proposes a customized test fixture to be used with a vector network analyzer (VNA) for accurate impedance measurement of filtering chokes. By modeling the test fixture as a lumped circuit and de-embedding it from the measurement setup, the true impedance of the choke under test can be obtained with excellent accuracy. The proposed measurement setup with the dedicated test fixture is validated experimentally up to 30 MHz.