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A High Sensitivity Broadband Monitoring Current Probe for Conducted Emissions Testing

A current probe and current monitoring technology, which is applied in the direction of only measuring current, measuring current/voltage, measuring electricity, etc., can solve the problems of poor transmission impedance characteristics, affecting the accuracy of conduction emission test results, etc.

Active Publication Date: 2019-01-01
BEIHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] At present, commercial current probes have poor transmission impedance characteristics in low frequency bands due to factors such as the materials used and structural design. Especially for broadband current probes, their transmission impedance is close to that of test equipment in low frequency bands. Sensitivity limit, which affects the test result accuracy of conducted emission test at low frequency

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  • A High Sensitivity Broadband Monitoring Current Probe for Conducted Emissions Testing
  • A High Sensitivity Broadband Monitoring Current Probe for Conducted Emissions Testing
  • A High Sensitivity Broadband Monitoring Current Probe for Conducted Emissions Testing

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Embodiment Construction

[0024] The present invention will be described in detail below in conjunction with the accompanying drawings.

[0025] The invention provides a high-sensitivity broadband current monitoring probe for conduction emission test. The design, development and composition of the probe are carried out according to the following steps, as figure 2 shown.

[0026] Step 1: Select the material for the current probe;

[0027] according to figure 1 The schematic diagram of the equivalent circuit of the current probe is shown, and the transmission characteristics of the current probe are calculated and analyzed. In the equivalent circuit, the tested cable is equivalent to the primary single-turn coil of the mutual inductance circuit, and its self-inductance is much smaller than the circuit mutual inductance, which can be ignored in the calculation; in this circuit, L S Represents the secondary self-inductance of the mutual inductance circuit; L M Represents the circuit mutual inductanc...

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Abstract

The invention discloses a high-sensitivity broadband monitoring current probe for conducted emission tests, and belongs to the technical field of electromagnetic conducted emission tests. With a calculation method combining an equivalent circuit and a high-frequency electromagnetic field, the high-sensitivity broadband monitoring current probe is designed and developed. According to the current probe, a novel material serves as a magnetic core according to the calculation result of the equivalent circuit, and the structural size is determined according to the simulating calculation result of the electromagnetic field. The comparison result of a comparison test of the current probe and a commercial probe shows that the test sensitivity of the current probe is higher than that of the commercial probe by 15 dB or above at the low-frequency band of 20 Hz-10 kHz, and the transfer impedance of the current probe can reach or exceed the test sensitivity index of the commercial probe at the high-frequency band of 10 kHz-500 MHz. The performance of the circuit probe can meet the requirements of electromagnetically compatible conducted emission tests.

Description

technical field [0001] The invention relates to the technical field of electromagnetic compatibility testing, in particular, it designs and develops a high-sensitivity broadband monitoring current probe for conduction emission testing. Background technique [0002] The conducted emission of the tested product is one of the core assessment contents of the electromagnetic compatibility test. The conducted emission test is generally divided into two types: using a linear impedance stabilization network to test the conducted emission voltage of the tested product and using a current probe to test the conducted emission current of the tested product Types of. The current probe test method is to clamp the current probe to the cable under test, induce the electromagnetic field generated by the cable bundle through which the signal passes, use the receiver to receive the port voltage sensed by the probe, and then calculate the test result, so as to obtain Current intensity in the c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R19/00G01R31/00
CPCG01R19/0092G01R31/001
Inventor 苏东林吕冬翔刘焱陈尧
Owner BEIHANG UNIV