| 摘要 |
<P>PROBLEM TO BE SOLVED: To enhance the responsiveness of control against fluctuations in an output voltage of a switching power supply device. <P>SOLUTION: A switching power supply device discriminates whether or not an output voltage Vout<SB POS="POST">1</SB>is equal to or higher than a reference voltage Vth (S12). When the output voltage Vout<SB POS="POST">1</SB>is equal to or higher than the reference voltage Vth, a value larger than in an ordinary case is adopted as a coefficient Kp of a proportional term for calculating a controlled variable Δd and a value larger than in an ordinary case is adopted as a coefficient Ki of an integration term. A controlled variable is calculated by using the adopted coefficients. When the output voltage greatly fluctuates, the controlled variable is significantly changed, thus converging the output voltage to a target voltage in a short time. <P>COPYRIGHT: (C)2012,JPO&INPIT |
