Nominal contact resistance, minimum erosion and material transfer are required with low cost materials working in a wide currents range for DC relays. Ag-Ni contact materials have low contact resistance, but the erosi...Nominal contact resistance, minimum erosion and material transfer are required with low cost materials working in a wide currents range for DC relays. Ag-Ni contact materials have low contact resistance, but the erosion and material transfer are large at high current level. Ag-SnO2 contact materials have good anti-welding properties and resistance to arc erosion, but they have large contact resistance during working and are easily block SnO2 from flocking together on the surface at low current level. In this paper, the failure mechanisms of Ag-Ce contact material were studied. The surface morphologies of the contacts after electrical endurance test for Ag-Ce contact material were compared with that of Ag-Ni and Ag-SnO2 contact materials. The effect of Ce on the surface morphologies of the contacts after electrical endurance test was analyzed.展开更多
In this paper, the reliability of contactor relay is studied. There are three main parts about reliability test and analysis. First, in order to analyze reliability level of contact relay, the failure ratio ranks are ...In this paper, the reliability of contactor relay is studied. There are three main parts about reliability test and analysis. First, in order to analyze reliability level of contact relay, the failure ratio ranks are established as index base on the product level. Second, the reliability test method is put forward. The sample plan of reliability compliance test is gained from reliability sample theory. The failure criterion is ensured according to the failure modes of contactor relay. Third, after reliability test experiment, the analysis of failure physics is made and the failure reason is found.展开更多
A 1∶4 static frequency divider has been designed and realized in a 0.35-micron standard CMOS technology. The chip consists of two identical 1∶2 divider cells, which are based on SCL (Source Coupled Logic) flip-flops...A 1∶4 static frequency divider has been designed and realized in a 0.35-micron standard CMOS technology. The chip consists of two identical 1∶2 divider cells, which are based on SCL (Source Coupled Logic) flip-flops. By revising the traditional topology of SCL flip-flop, we get a divider with better performances. Measurement results show that the whole chip achieves the frequency division at more than 6GHz. Each 1∶2 divider consumes 11mW from a 3.3V supply. The divider can be used in RF and Optic-fiber Transceivers and other high-speed systems.展开更多
文摘Nominal contact resistance, minimum erosion and material transfer are required with low cost materials working in a wide currents range for DC relays. Ag-Ni contact materials have low contact resistance, but the erosion and material transfer are large at high current level. Ag-SnO2 contact materials have good anti-welding properties and resistance to arc erosion, but they have large contact resistance during working and are easily block SnO2 from flocking together on the surface at low current level. In this paper, the failure mechanisms of Ag-Ce contact material were studied. The surface morphologies of the contacts after electrical endurance test for Ag-Ce contact material were compared with that of Ag-Ni and Ag-SnO2 contact materials. The effect of Ce on the surface morphologies of the contacts after electrical endurance test was analyzed.
文摘In this paper, the reliability of contactor relay is studied. There are three main parts about reliability test and analysis. First, in order to analyze reliability level of contact relay, the failure ratio ranks are established as index base on the product level. Second, the reliability test method is put forward. The sample plan of reliability compliance test is gained from reliability sample theory. The failure criterion is ensured according to the failure modes of contactor relay. Third, after reliability test experiment, the analysis of failure physics is made and the failure reason is found.
文摘A 1∶4 static frequency divider has been designed and realized in a 0.35-micron standard CMOS technology. The chip consists of two identical 1∶2 divider cells, which are based on SCL (Source Coupled Logic) flip-flops. By revising the traditional topology of SCL flip-flop, we get a divider with better performances. Measurement results show that the whole chip achieves the frequency division at more than 6GHz. Each 1∶2 divider consumes 11mW from a 3.3V supply. The divider can be used in RF and Optic-fiber Transceivers and other high-speed systems.
