| 摘要 |
PROBLEM TO BE SOLVED: To appropriately lighten a light source even in a high-temperature atmosphere.SOLUTION: An emergency illuminating device comprises a light source 1, an accumulator battery 2, a charging circuit 3, a regular-use lighting circuit 4, an emergency lighting circuit 5, a switching part 6, and the like. In addition, the emergency lighting circuit 5 comprises a push-pull inverter circuit 50, a full-wave rectifier 51 consisting of a diode bridge, a smoothing capacitor 52, and the like. Since the emergency lighting circuit 5 is configured of a self-excited oscillation type switching power supply (the push-pull inverter circuit 50), the light source 1 can be appropriately lightened even in the high-temperature atmosphere compared with the case that an IPD or a control IC or the like is used. |
