PWMPWM switching 1 DC-DC Converter UPS (PWM:Pulse Width Modulation) Inverter D PWM PWM PWM switching 1 PWM 2 PWM MOSFET PWM Gate Switching 2 PWM 2 PWM carry (comparator) 3 I1= I2 CT CT 3 PWM RT current mirror IC1 CT RT current mirror (I1) CT I2 Tr1 ON 3 carry 1 carry 3 carry 0V 4 4 IC PWM 1 3 carry (1V/div.,10s/div.) 4 PWM slope slope 5 PWM 3 IC cary timing dual slope slope ON timing PWM ON ON/OFF ON/OFF OFF PWM (power) 5 PWM 6 (transition) switching over shoot under shoot : slope ) slope ) PWM ON/OFF over shoot OFF timing ON timing ON OFF timing ( 6(a))( ON timing Off ( 6(b))( under shoot 6 PWM 2 1～4V 7 IC PWM 2 2 3 carry PWM (1V/div.,10s/div..) 7……