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The invention discloses a power semiconductor welding layer life evaluation and failure prediction method. The method comprises the following steps: S1, acquiring chip design parameters, power semiconductor module sealing and testing process parameters and power semiconductor module working condition monitoring data; s2, constructing a heat transfer model, a mechanical stress model and an electrical property model by adopting a finite element analysis method according to the data obtained in S1; relates to the technical field of power semiconductors, and aims to comprehensively consider chip design parameters, power semiconductor module sealing and testing process parameters and working condition monitoring data, construct a plurality of physical models, deeply analyze the influence on the service life of a welding layer from multiple dimensions of heat transfer, mechanical stress and electrical performance, and greatly improve the service life of the welding layer compared with single thermal fatigue. Or by mainly depending on specific precursor parameters and utilizing a neural network fitting method, the residual life of the welding layer can be evaluated more comprehensively and accurately, and more accurate life prediction information is provided for reliable operation of the power semiconductor module.

This invention relates to the field of power transmission line monitoring and early warning technology, specifically an intelligent bird monitoring device and risk warning method for power transmission lines. The device includes an intelligent bird monitoring device for power transmission lines and a risk warning method using the device. The monitoring device comprises an image acquisition module, a thermal sensing module, a sound acquisition module, a motion monitoring module, an edge computing module, and a power supply module. Each acquisition module is signal-connected to the edge computing module, and the power supply module provides power to all modules. Through the collaborative work of multiple modules, comprehensive and multi-dimensional monitoring of bird activity in power transmission line areas is achieved. The early warning method is implemented through five steps: data acquisition, data processing, intelligent analysis, risk assessment, and early warning output. This invention enables comprehensive and accurate monitoring and tiered early warning of bird activity in power transmission line areas, improving monitoring efficiency and early warning accuracy, and ensuring the safe and stable operation of power transmission lines.

The embodiment of the present application discloses a method, apparatus, terminal device and storage medium for implementing SAR control, the method comprising: obtaining an average time period of a specific absorption rate SAR and a first SAR target value within the average time period; determining the on time and off time of the transmitter within the average time period based on the current first transmission power of the transmitter and the first SAR target value; controlling the on and off time of the transmitter based on the on time and off time of the transmitter within the average time period, so that the SAR average value within the average time period is less than or equal to the first SAR target value. In this way, the transmitter is controlled to work discontinuously, and the SAR average value within the average time period is controlled below a specified value by limiting the on time of the transmitter, and the transmitter always transmits data with a stable transmission power, which can ensure communication quality and avoid the risk of dropped calls.

A smoke sensor, a shell and a smoke alarm, comprising: a shell, the shell comprising a sensor base and a sensor cover arranged oppositely; a transmitting tube and a receiving tube located in the shell; the transmitting tube is used for transmitting a light beam into the shell; the receiving tube is used for receiving the light beam; a first included angle is formed between the center line of the transmitting light beam of the transmitting tube and the sensor base; a second included angle is formed between the center line of the receiving light beam of the receiving tube and the sensor base; the transmitting light beam of the transmitting tube and the receiving light beam of the receiving tube exist an intersection point; the distance between the sensor base and the sensor cover is a sensor height; the distance between the intersection point and the sensor cover can be greater than 24% of the sensor height; the distance between the intersection point and the sensor base can be greater than 24% of the sensor height. The interference of non-smoke particles can be reduced, and the false alarm rate can be reduced.