| 摘要 |
<p>PURPOSE:To stabilize the output voltage of a current resonance ' switching power supply and protect its power supply circuit without providing an auxiliary power supply. CONSTITUTION:A tertiary winding L3 is provided on a converter transformer (CT) which is turned on and off by switching transistors Q1 and Q2 and the output V3 of the tertiary winding L3 is supplied to a detection circuit block (CCB) which detects the output voltage and current as a power source. The primary winding L1 and the secondary winding L2 of the converter transformer are wound on the transformer core at positions facing to each other and the tertiary winding L3 is provided at a position apart from the secondary winding L2 and above the primary winding L1. With this constitution, even if the secondary output is declined, the required voltage V3 can be maintained.</p> |
