| 摘要 |
<p>[Solution] The present invention is provided with: a transformer having a primary winding, a secondary winding and a tertiary winding; a primary-side rectifying/smoothing circuit, which converts alternating-current power to direct-current power and smoothes the power; a secondary-side rectifying/smoothing circuit, which smoothes secondary-side power; a tertiary-side rectifying/smoothing circuit, which smoothes power of the tertiary winding; a switching circuit, which opens/closes the primary winding; a pulse width control circuit, which controls the pulse width of drive signals that control the opening/closing of the switching circuit; and a secondary-side electrolytic capacitor deterioration detecting circuit, which detects deterioration of the secondary-side electrolytic capacitor. The secondary-side electrolytic capacitor deterioration detecting circuit detects deterioration of the secondary-side electrolytic capacitor by inputting the output voltage of the tertiary-side rectifying/smoothing circuit, and stops operation of a switching power supply circuit.</p> |
