| 摘要 |
PROBLEM TO BE SOLVED: To optimize frequency and gain characteristics and provide stable operation and flexibility design, along with easy designing, by dividing a feedback control circuit and allotting a frequency range to be controlled by the feedback control circuit with regard to a call signal generator or a switching power supply. SOLUTION: An error amplifier circuit 14 is connected to a feedback circuit 13 having a large low-frequency gain to reduce a static variation in low frequency of a call signal and in DC output voltage, while an error amplifier circuit 16 is connected to a feedback circuit 15 having a large high-frequency gain to reduce a dynamic variation in output voltage caused by an abrupt change of a load, which is connected through an AC connection capacitor 17, and feed the stable output. Each output error signal generated from the error amplifier circuits 14 and 16 by comparing with a reference power voltage is processed by an adder 12 to feed a driving signal to a converter circuit. In this way the control frequency is allotted to provide a large gain in wide range with stability. |
