Patent ID: 8836309
Filing Date: 2014-09-16
Classification: H02M

Abstract:
1. A control device, comprising: a first comparator circuit, for generating a first control signal and a second control signal for respectively configuring a first switch and a second switch of a buck-boost converter according to a first periodical signal and according to a first feedback signal generated from an output voltage of the buck-boost converter; a second comparator circuit, for generating a third control signal and a fourth control signal for respectively configuring a third switch and a fourth switch of the buck-boost converter according to a second periodical signal and according to a second feedback signal generated from the output voltage of the buck-boost converter; and a third comparator circuit, for generating a fifth control signal, a sixth control signal, a seventh control signal, and an eighth control signal for respectively configuring the first switch, the second switch, the third switch, and the fourth switch of the buck-boost converter according to a third periodical signal and according to a third feedback signal generated from the output voltage of the buck-boost converter; wherein the first control signal and the second control signal do not conduct the first switch and the second switch at the same time; the third control signal and the fourth control signal do not conduct the third switch and the fourth switch at the same time; the duty cycle of the fifth control signal and the duty cycle of the seventh control signal are substantially the same; the duty cycle of the sixth control signal and the duty cycle of the eighth control signal are substantially the same; the fifth control signal and the sixth control signal do not conduct the first switch and the second switch at the same time; and the seventh control signal and the eighth control signal do not conduct the third switch and the fourth switch at the same time.