| 摘要 |
PROBLEM TO BE SOLVED: To make it possible to perform protection in a recovery type to actuate overvoltage protection upon detection of abnormality of input voltage and then recover from the overvoltage, and reduce power consumption during waiting time.SOLUTION: A power source device includes: constant power source unit 200 that is supplied with power from an AC power source and outputs a voltage Vout1; non-constant power source units 300 and 400 that are supplied with power from an AC power source and respectively output a voltage Vout2 and a voltage Vout3; a triac 103 that is operated by the voltage Vout1 of the constant power source unit, and is provided on a power supply path from the AC power source to the non-constant power source units to supply and block the power to the non-constant power source units; an overvoltage detection circuit 211 that detects that a voltage equal to or larger than a predetermined voltage is input from the AC power source to the constant power source unit; and a power source IC 205 that stops, when the overvoltage detection circuit detects the overvoltage, the output of the voltage Vout1 from the constant power source unit to control the triac 103 to block the power supply to the non-constant power source units. |
