• Journal of Korean Electronics
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• v.6 no.10
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• pp.43-45
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• 1986

• Proceedings of the Korean Society of Precision Engineering Conference
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• 2013.05a
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• pp.655-656
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• 2013

• Journal of the Korean Society of Manufacturing Process Engineers
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• v.21 no.2
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• pp.46-53
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• 2022

This paper presents the design and manufacture of a Solid State Relay (SSR) life prediction device that can predict the lifetime of an SSR, which is a key component of a glass forming machine. The lifetime of an SSR is over when the current supplied to the relay is overcurrent (20 A or higher), and the operating time is 100,000 h or longer. Therefore, the life prediction device for the SSR was designed using DSP to accurately read the current and temperature values from the current and temperature sensors, respectively. The characteristic test of the manufactured non-contact relay life prediction device confirmed that the current and temperature were safely measured. Thus, the SSR lifetime prediction device developed in this study can be used to predict the lifetime of an SSR attached to a glass forming machine.

• Journal of the Korean Institute of Telematics and Electronics T
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• v.36T no.1
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• pp.51-57
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• 1999

This thesis is written about the Wired Logic Type Unit in developing equipment that the load is driven, that the interface unit connect with 1 Scan time to PO30 of operated PLC output contact with that a sensing signal of Temperature Sensor RSD Pt $100\Omega$ let generate the relay output of temperature controller and input the PLC. The PLC Test Kit in country that the PLC to be programmed at the PLC education place is able to drive the load, is done to do a education of PLC on status that interface process between PLC and load are disregarded. As Developing Kit for supplement this point, when the relay output of temperature controller to use Pt 100 of temperature sensor as mentioned on the former among every kinds of sensor feed back to the input of the PLC, as the equipment to act with real time system that the output contact of PLC operated to insert the WLTIJ among PC, PLC and the load, it can understand and see very easy the main principle of PLC use. The structure of WLTU to be a interface unit of load separated as to the point of contact and noncontact, sensor, indicating lamp and A contact and B contact that is belong to driving part, and a motor is belong to loading part.

• Journal of Advanced Marine Engineering and Technology
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• v.34 no.6
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• pp.906-913
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• 2010

Recently, lots of researches are carried out to develop hybrid power generation system for ocean facility. Normally, the stand-alone type power system is used in the ocean facility, which is influenced by weather condition. To improve the efficiency, a various charging strategy with switching algorithm has been studied. In this paper, the power system using multi-level type is proposed. The simulation results based on actual data of photovoltaic and wave hybrid power system are presented. The results show that the rate of charging time is increased 5~11% and 7~47% respectively to compare the conventional technique.