| 摘要 |
<P>PROBLEM TO BE SOLVED: To prevent the fire due to the fault of an internal circuit, concerning a package-type small-sized power unit. <P>SOLUTION: This power source protective circuit 1 is composed of a light emitter 11 which is provided in the upper section within a package, a light receiver 12 which is provided in a position where it can receive the light of the light emitter 11 so as to output a smoke detection signal 101 when light is intercepted by the fuming within the casing and the amount of light reception drops under a reference value, a power breaker 13 which breaks input power by a smoke detection signal 101, an alarm indicator 14 which indicates an alarm by the smoke detection signal 101, a storage part 15 which stores the data of the smoke detection signal, an auxiliary power source 16 which supplies power to each part of itself, and an intermission circuit 17 which intermits the power to be supplied to each part, with specified duty and in specified cycles. <P>COPYRIGHT: (C)2005,JPO&NCIPI |
