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公开(公告)号：US11150284B2
公开(公告)日：2021-10-19
申请号：US16137126
申请日：2018-09-20
Applicant: Huawei Technologies Co., Ltd.
Abstract: A frequency regulation method and apparatus is applied to an insulation impedance detection apparatus in a direct current power system, and relates to the field of security monitoring technologies of a direct current electrical system. The method includes: collecting sampling voltages at a sampling point for at least three time points; determining a voltage frequency regulation manner based on the sampling voltages, obtained through sampling, at the at least three time points; and then regulating a voltage frequency of a power supply according to the determined voltage frequency regulation manner. The voltage frequency of the power supply can be regulated based on the at least three sampling voltages obtained through sampling. Therefore, the insulation impedance detection apparatus reduces insulation impedance detection duration while ensuring accuracy of measured insulation impedance.
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2.发明公开公开(公告)号：US20230212721A1
公开(公告)日：2023-07-06
申请号：US18174373
申请日：2023-02-24
Inventor： Xiaoming Xu , Ming Cai , Wei Yuan , Yonghu Lv , Wei Mo
CPC classification number: C22C38/52 , C22C38/48 , C22C38/44 , C22C38/04 , C22C38/02 , C22C38/002 , H01F1/14708 , B22F3/225
Abstract: A steel, a steel mechanical part, an electronic device, and a preparation method for a steel mechanical part are provided. The steel includes components of the following mass percentages: chromium: 7% to 11%, nickel: 2% to 7.5%, cobalt: 6% to 15%, molybdenum: 4% to 7%, oxygen: a trace to 0.4%, carbon: a trace to 0.35%, and iron: 50% to 80%. The steel provided in this application has relatively high mechanical strength and is not easily deformed, and therefore a risk of fracture caused when an electronic device using the steel falls off from a height is reduced.
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公开(公告)号：US20190025357A1
公开(公告)日：2019-01-24
申请号：US16137126
申请日：2018-09-20
Applicant: Huawei Technologies Co., Ltd.
Abstract: A frequency regulation method and apparatus is applied to an insulation impedance detection apparatus in a direct current power system, and relates to the field of security monitoring technologies of a direct current electrical system. The method includes: collecting sampling voltages at a sampling point for at least three time points; determining a voltage frequency regulation manner based on the sampling voltages, obtained through sampling, at the at least three time points; and then regulating a voltage frequency of a power supply according to the determined voltage frequency regulation manner. The voltage frequency of the power supply can be regulated based on the at least three sampling voltages obtained through sampling. Therefore, the insulation impedance detection apparatus reduces insulation impedance detection duration while ensuring accuracy of measured insulation impedance.
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