| 摘要 |
A switching power device includes a control circuit 20 that inputs output voltage from a voltage detecting terminal a and turns ON/OFF a switching element Q 1 on a basis of the output voltage, detection holding means 23, 24 that detect an abnormality when it occurs in a power-factor improvement circuit, stop an operation of the switching element and output a holding signal while holding a stopped condition of the switching element, abnormal operating signal outputting means 30 that outputs an abnormal operating signal in the form of voltage more than a predetermined voltage to the voltage detecting terminal a on the basis of the holding signal from the detection holding means 23, 24 , and abnormal signal detecting means 40 that outputs an abnormal signal to a load circuit 10 upon detecting that a potential of the voltage detecting terminal a has reached voltage more than the predetermined voltage on the basis of the abnormal operating signal from the abnormal operating signal outputting means 30. |
