New ETRI sensor endures higher heat

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New ETRI sensor endures higher heat

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Using in-house technology, the Electronics and Telecommunications Research Institute said yesterday that it has produced a device that prevents expansion and explosion of overheated devices. The product is a switch that cuts connection to objects when they overheat. It was discovered during research on why electricity sometimes flows through non-conductive material. The team of scientists was led by Kim Hyun-tak. The sensor that ETRI developed is about 20 times more sensitive than semiconductor temperature sensors, but it is smaller. The switch responds to temperature. On tests conducted on cell phone batteries, 42 percent became bloated at temperatures of 166 degrees centigrade (331 degrees fahrenheit) and exploded at 177 degrees centigrade. When the sensor switch was attached to the batteries, only 22 percent showed signs of expansion at 160 degrees and none exploded at temperature up to 210 degrees. “These sensor switches can prevent major accidents from exploding electronic devices, such as laptops or cell phones,” Mr. Kim said. Depending on materials used to make the switch, the temperatures that the sensors endure are on a broader range than those on the market. ETRI said that it has applied for 24 patents in a number of foreign countries, and forecast that temperature switches made from its sensors would compete with semiconductor temperature sensors in the future. It estimated the global market to amount to 948 billion won ($997 million) in 2010. by Wohn Dong-hee
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