| 摘要 |
PROBLEM TO BE SOLVED: To suppress a vibration sound from a transformer with a simple configuration.SOLUTION: A power source device includes: a primary winding Np; a transformer 120 that has a secondary winding Ns and an auxiliary winding Nb; and a main switching element 104 that is connected to the primary winding Np to control supply and interruption of a current to the primary winding Np, and repeats turn-on and turn-off of the main switching element 104 to output a voltage from the secondary winding Ns. The power source device includes an integration circuit that is connected to the auxiliary winding Nb to determine the on-time of the main switching element 104 and transistors 113 and 115 that switches the on-time determined by the integration circuit according to a voltage generated in the auxiliary winding Nb.SELECTED DRAWING: Figure 1 |
