CONTROLLER FOR SWITCHING POWER SUPPLY AND SWITCHING POWER SUPPLY

摘要

PROBLEM TO BE SOLVED: To simplify the constitution of a switching power supply under a digital control. SOLUTION: An adder 11 outputs a signal VS showing a (Vr-Vo) value. A multiplier 12 outputs a control signal GS showing a value of G(Vr-Vo) based on the signal VS. A PWM signal generating circuit 20 generates a PWM signal KS for driving the switching power supply based on the control signal GS and an estimated current signal Ie and outputs this signal KS to the switching power supply. A selector 13 outputs a pulse signal PS showing any level value of "α" or "-β" based on the PWM signal KS. A high-pass filter 31 removes the DC component included in the pulse signal PS. An integrator 32 integrates a signal after a DC component is removed by the high-pass filter 31 and generates the estimated current Ie. COPYRIGHT: (C)2005,JPO&NCIPI