The South China University of Technology

China Electronic Product Reliability and Environmental Testing Research Institute (the Fifth Electronic Research Institute of Ministry of Industry and Information Technology) (Ceprei)

China Electronic Product Reliability and Environmental Testing Research Institute

Changjian Zhou

Yiqiang Chen

Bin Li

Pengfei Yu

Zhijian Chen

Bo Hou

Ziying Wu

Yinghui Chen

Weiheng Shao

Haofan Long

Shaolin Zhou

In a method for monitoring a degradation mechanism of a switch device in a power conversion circuit. When individually determining the degradation mechanism of internal defects of the switch device, it is determined through a change trend of a real-time current change rate that internal defect degradation is caused by an increase of an oxide layer defect density or an interface defect density. It is confirmed through a decrease in the real-time current change rate that internal defect degradation is caused by the increase of the oxide layer defect density. When the real-time current change rate increases, it is determined through a secondary testing including the on-state resistance and low-frequency noise testing that degradation is caused by accurate packaging and/or the increase of the interface defect density.

Method for monitoring degradation mechanism of switch device in power conversion circuit

The present disclosure relates to an asymmetric compensation method and apparatus for a two-port near field probe, a device, and a storage medium. The method includes: obtaining a first scattering parameter collected by a symmetric two-port network established based on a symmetric two-port near field probe; obtaining a second scattering parameter collected by an asymmetric two-port network established based on an asymmetric element; obtaining an overall response of a calibration network in a magnetic field environment, the calibration network being established based on the symmetric two-port near field probe and the asymmetric element; calculating a calibration factor based on the scattering parameter of the symmetric two-port near field probe, the scattering parameter of the asymmetric element, and the overall response of the calibration network in the magnetic field environment; and compensating the symmetric two-port near field probe according to a calibration factor.

Asymmetric compensation method and apparatus for two-port near field probe, computer device, and storage medium

A frequency locking method for a phase-locked loop comprises the following steps: S1, a frequency control module controls a numerically controlled oscillator to obtain an maximum output frequency and a minimum output frequency; S2, obtain a minimum frequency ratio and a maximum frequency ratio by means of a time-to-digital converter and the frequency control module; S3, calculate a first frequency control word and a first frequency ratio according to the minimum frequency ratio and the maximum frequency ratio; S4, the frequency control module uses the Newton's iterative method to recalculate a new frequency control word; S5, obtain a new frequency ratio according to the new frequency control word; S6, if the new frequency ratio is within an error range, end iteration and stably output the new frequency control word, and otherwise, jump to step S4.

Frequency locking method and circuit for phase-locked loop

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Guangzhou, China

Changjian Zhou