| 摘要 |
PROBLEM TO BE SOLVED: To reduce load power. SOLUTION: A secondary winding N2 for obtaining a DC output voltage E01 for a horizontal deflection output circuit, and a tertiary winding N3 for obtaining a DC output voltage E03 (200 V) for an image output circuit, are wound around the secondary side of a first insulation converter transformer PIT-1 constituted by a compound resonance type excellent in voltage conversion efficiency. In order to obtain the DC output voltage E03 for the image output circuit, an AC voltage generated in the tertiary winding N3 is subjected to half-wave rectification, and a DC voltage (65 V) generated on both ends of a filter capacitor C03 is applied to a DC output voltage (135 V) generated on both ends of a filter capacitor C01 by half-wave rectifying an AC voltage generated in the secondary winding N2 with a rectifier diode D01. As a result, the DC output voltage E03 for the image output circuit is obtained from the secondary side of the insulation converter transformer PIT-1. As a result, a switching power supply circuit can be constituted by using a compound resonance switching converter whose voltage conversion efficiency is superior to the conventional one, and power loss in a power supply can be reduced. |
