Research on an EMC High and Low Voltage Coupling Test Method

At present, the electromagnetic compatibility(EMC) high and low voltage coupling network test for automotive electrical sub-assembly(ESA) in the standard only requires the use of an adapter to connect the network and the test sample, in other words, the impedance matching is not considered. In practice, if the impedance does not match, accuracy and consistency of test results cannot be guaranteed. But it is difficult to achieve impedance matching in the whole frequency band.In view of the above problem, this paper proposes an impedance matching method for high-low voltage coupling test, by isolating indirectly contact between the test system and the sample, which reduces test errors and improves the accuracy of test data caused by impedance mismatch. The experimental results prove that this method can effectively solve the shortcomings of the existing high and low voltage coupling EMC test technology of electric vehicle ESA, and provide a reasonable test idea for accurately testing the electric vehicle ESA high and low voltage coupling network test method.