| 摘要 |
PURPOSE:To simplify the constitution of the titled circuit by employing a forward rectification system or feed forward rectification system for the rectification system to rectify the voltage of the tertiary winding of a switching output transformer to magnify the value of a starting resistor, and eliminating a switching circuit. CONSTITUTION:At time T1, when the power source is supplied a voltage VCC begins to increase gradually due to the starting resistor 7, and at time T2, when said voltage reaches a voltage VS, output voltages V2 and V3 beings to rise. When the operation starts after the time T2, a rectified voltage of the tertiary winding comes to be proportionate to primary rectified voltage V1 without being influenced by the rectified voltage of the secondary winding (load voltage V2), and rapidly rises to reach a stable voltage within a short time. Through the rising of the voltage VCC, the current of the primary winding is increased. And this increase makes the rectified output voltage of the tertiary winding increase, and said voltage rapidly rises. A resistance value enough to rise the VCC up to VS suffices for the function of the starting resistor 7. Accordingly, said value can be made larger than the conventional one. |
