A power line conduction interference signal detection circuit suitable for on-site electromagnetic compatibility detection

Abstract

The invention discloses a power line conduction interference signal detection circuit suitable for field electromagnetic compatibility detection. The power line conduction interference signal detection circuit comprises a power plug, a second-order passive high-pass filter, an attenuator and an analog-digital conversion circuit. The second-order passive high-pass filter and the attenuator can be used for filtering a power fundamental wave signal which is stable 50ohm input impedance in a radio frequency range. When being used for the field electromagnetic compatibility detection, the detection circuit only needs to be connected to a same power socket connected with EUT (equipment under test), the original connection form of an EUT system does not need to be destroyed, and thus an LISN (line impedance stabilization network), an attenuator, a measurement receiver and the like applied in a laboratory environment are omitted.

Description

technical field [0001] The present invention relates to an interference signal detection circuit, more particularly, to a power line conduction interference signal detection circuit suitable for on-site electromagnetic compatibility detection. Background technique [0002] Electronic equipment can generate external interference signals through radiation and conduction. Since electronic equipment in the same system is usually connected together through the power grid, if one of the electronic equipment generates external interference signals through the power line, then the Other electrical equipment may be affected, resulting in performance degradation or functional failure. Therefore, in a certain national military standard, a requirement is put forward for the conduction interference detection of the power line. The current traditional detection method is to provide a specified impedance within the radio frequency range at both ends of the measurement point of the power s...

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Problems solved by technology

[0003] Because this traditional detection method is based on the test in the laboratory environment, special test equipment must be used, such as artificial power network, attenuator, measurement receiver, data recording device, etc., and the cost of special test equipment in these laboratory environments Expensive and inconvenient for on-site electromagnetic compatibility testing

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