Patent ID: 9698693
Date: 2017-07-04
CPC Classifications: H02M

Claim:
1. A control circuit configured to control a power stage circuit of a switch-type converter, the control circuit comprising: a) a current detection circuit configured to detect whether an inductor current rises to a first threshold value during an on time of a first switch, and to detect whether said inductor current is greater than a second threshold value when an on time of a second switch is greater than or equal to a current detection blanking time, wherein said power stage circuit comprises said first and second switches and said inductor; b) a logic circuit configured to deactivate a first switch control signal and to activate a second switch control signal when said inductor current rises to said first threshold value such that said first switch remains off and said second switch remains on during a regulation time; and c) said logic circuit being configured to generate said first and second switch control signals according to a pulse-width modulation (PWM) signal and a zero-crossing detection signal outside of said regulation time, wherein said regulation time is a larger of a first time and a second time, wherein said first time comprises a predetermined time, and said second time comprises a time duration that said inductor current decreases from said first threshold value to said second threshold value.