| 摘要 |
PROBLEM TO BE SOLVED: To prevent beats from appearing on a CRT screen. SOLUTION: As a switching power circuit for a cathode-ray tube display, a flyback transformer is connected in parallel with a primary coil N1 of an insulating converter transformer, or with a secondary coil N2, using a composite- resonance type converter as a fundamental component. Concerning a main switching element of a primary-side voltage-resonance type converter, switching s performed in synchronization with the frequency of a horizontal synchronous signal obtained from a horizontal deflection circuit system. Consequently, interference on a horizontal deflecting circuit portion, due to a leakage magnetic flux generated from the insulated converter transformer and the flyback transformer, is prevented. |
