| 摘要 |
When an interruption of an AC power supply occurs, an interruption detection circuit (20) detects the interruption to output a detection signal (SI) ("H" level). In response to input of the detection signal (SI), a coupling unit (10) electrically couples power supply nodes (N0, N1). Accordingly, based on electric charge stored by capacitors (7, 8), a low voltage (VCCL) can be supplied for a predetermined period of time. Using the electrolytic capacitors already provided in the circuitry, supply of the voltage can be continued for a predetermined period of time and thus the occupied area can be reduced. |
