High-frequency circuit spacing electromagnetic radiation characteristic analyzing and predicting method

Abstract

The invention discloses an analysis and pre-estimation method of electromagnetic radiation characteristics of high-frequency circuit space. An input end of a preamplifier is connected with a current probe, an output end is connected with a spectrum analyzer; the current probe is blocked in a cable of a circuit loop for measurement to obtain a common-mode current value; field strength value of a common-mode radiation is calculated according to the common-mode current value. The input end of the preamplifier is connected with a differential-mode probe, and the output end is connected with the spectrum analyzer. The differential-mode probe is blocked in the cable of a circuit loop for measurement to obtain a differential-mode current value. The field strength value of a differential-mode radiation is calculated according to the differential-mode current value. A second step that the current probe is blocked on an earth cable of a circuit to be tested; the earth cable of the circuit is divided into several segments, the current probe is moved to the position of the earth cable to measure the current parameter values of each segments of the earth cable respectively, and the field strength value of the circuit space electromagnetic field is calculated. The method is applicable to the analysis and estimation of the electromagnetic radiation characteristics of the high-frequency circuits, and is convenient, rapid and practical.

Description

technical field [0001] The present invention relates to a method for analyzing and estimating circuit near-field radiation characteristics of an electronic circuit, specifically a method for analyzing and estimating the space electromagnetic radiation characteristics of a high-frequency circuit based on current measurement, which is radiated electromagnetic interference (EMI) ) noise mechanism judgment and suppression provides a premise, belonging to the field of electromagnetic compatibility technology. Background technique [0002] Modern power electronic products are facing miniaturization and intelligence, and the design of the system is becoming more and more complex. In addition, the parasitic parameters of the system generated by the high-speed switching of the switching elements in the power electronic equipment cause the equipment to suffer from conductive interference and radiation interference. , and the requirements for the system's ability to resist electromagne...

AI Technical Summary

Problems solved by technology

However, such instruments are relatively expensive and unaffordable for small and medium-sized enterprises, and such systems can only give results of field strength, but cannot infer the radiation characteristics of the circuit (ie, common-mode radiation or differential-mode radiation). Provide guidance on the cause of circuit radiation interference, that is, it cannot be inferred from the measurement results that the electromagnetic radiation in the circuit space is caused by common-mode or differential-mode radiation

In addition, the existing radiated EMI measurement devices are all based on electromagnetic field measurement, and the operability is not strong, which often brings great troubles to the measurement operation

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