Patent ID: 9590508
Date: 2017-03-07
CPC Classifications: H02M,H03K

Claim:
1. A control apparatus for a buck-boost power supply, comprising: an output part comprising: a pulse-width modulation (PWM) signal generator configured to generate a PWM signal having a pulse which has a pulse width based on an output voltage; a mode pulse signal generator configured to generate a mode pulse signal having a signal which has a time period based on at least one of an input voltage, a difference between the input voltage and the output voltage, and a difference between the input voltage and a voltage proportional to the output voltage; a first delayed signal generator configured to generate a first delayed signal having a pulse which has a rising edge or falling edge which is delayed for a first delay time from a rising edge or a falling edge of the pulse of the PWM signal, wherein the first delay time is equal to or longer than a time required to charge the first capacitor; and an output controller configured to control the output part, based on the PWM signal, the mode pulse signal and the first delayed signal, wherein the output controller controls switching of the output part so that a first time period during which the high-side switch of the two primary switches is off and a low-side switch of the two primary switches is on is longer than or equal to the first delay time.