| 摘要 |
<p>The present invention relates to a power supply circuit employed in a various kind of electronic appliances , telecommunications equipment, and the like, for generating a voltage pulse by resonance effect of a primary side of transformer, and outputting the voltage pulse from a secondary side after raising a voltage thereof. The invention aims at providing the power supply circuit that suppresses undulation in amount of electric current, and prevents noises from being generated on an display screen. To achieve the above object , the invention provides a composition in which a control circuit (27) is rendered to switch a second switching element (32) into an OFF state while a first switching element (24) is in ON state, and to switch the second switching element (32) into an ON state when voltage of a primary coil (22) is greater than voltage of a driving power supply (23) after an electric current flows in a first diode (26) while the first switching element (24) is in OFF state. <IMAGE></p> |
