| 摘要 |
PURPOSE:To control constantly the load voltage of a DC/DC converter by providing two error amplifiers, and controlling the double negative feedbacks to stabilize both the output voltages of the first and second smoothing circuits. CONSTITUTION:A switching element 3 is connected to the primary side of a transmformer 2, the pulse voltage produced at the secondary side is rectified, and a DC voltage is supplied to a load 8 through the first and second smoothing circuits 6, 7 and 9, 10. The voltage at the point A of the first smoothing circuit is applied to the error amplifier 30, and the voltage at the point B of the second smoothing circuit is applied through an integrator 20 to the error amplifier 11, and are compared with reference voltage and are a sawtooth signal 14 by a voltage comparator 32, thereby controlling the base of the element 3. Accordingly, high speed responding operation is performed for the voltage variation at the point A and low speed responding operation is performed for the voltage variation at the point B, thereby obtaining the stabilized output voltage. |
