| 摘要 |
PROBLEM TO BE SOLVED: To provide a switch circuit for realizing an asymmetrical fault characteristic through the combination of semiconductor devices and realizing fail-safe performance of a switch operation without the need for a fail-safe control apparatus inside a switching apparatus. SOLUTION: An encoding circuit encodes a signal received by the switch circuit and a decoding circuit decodes the encoded signal into the original signal. The encoding circuit and the decoding circuit are operated by encoding information and decoding information which are externally received. Since a filter at an output stage of the switch circuit passes only the signal having characteristics of the original signal, the switch circuit interrupts its signal output unless the encoding and the decoding function normally. COPYRIGHT: (C)2004,JPO&NCIPI
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