| 摘要 |
When an interruption of an AC power supply occurs, an interruption detection circuit detects the interruption to output a detection signal ("H" level). In response to input of the detection signal, a coupling unit electrically couples power supply nodes. Accordingly, based on electric charge stored by capacitors, a low voltage 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.
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