CONTROL CIRCUIT OF INTERLEAVED SWITCHING POWER SUPPLY AND CONTROL METHOD THEREOF

摘要

In one embodiment, a control circuit configured for an interleaved switching power supply, can include: (i) a feedback compensation signal generation circuit configured to sample an output voltage of the interleaved switching power supply, and to generate a feedback compensation signal; (ii) a first switch control circuit configured to compare a first branch voltage signal that represents an inductor current of a first voltage regulation circuit against the feedback compensation signal, where when the first branch voltage signal is consistent with the feedback compensation signal, a first switch on signal is generated to control a first main power switch of the first voltage regulation circuit to be on for a predetermined time, and then off; and (iii) a second switch control circuit configured to compare a second branch voltage signal that represents an inductor current of a second voltage regulation circuit against the feedback compensation signal.

主权项

1. A control circuit configured for an interleaved switching power supply, the control circuit comprising:
a) a feedback compensation signal generation circuit configured to sample an output voltage of said interleaved switching power supply, and to generate a feedback compensation signal; b) a first switch control circuit configured to compare a first branch voltage signal that represents an inductor current of a first voltage regulation circuit against said feedback compensation signal, wherein when said first branch voltage signal is consistent with said feedback compensation signal, a first switch on signal is generated to control a first main power switch of said first voltage regulation circuit to be on for a predetermined time, and then said first main power switch is controlled to be off; and c) a second switch control circuit configured to compare a second branch voltage signal that represents an inductor current of a second voltage regulation circuit against said feedback compensation signal, wherein when said second branch voltage signal is consistent with said feedback compensation signal, a second switch on signal is generated to control a second main power switch of said second voltage regulation circuit to be on, and wherein said second switch control circuit is configured to detect a phase difference between said first and second switch on signals, and to adjust an on time of said second main power switch to regulate said phase difference to be 180° in response to said phase difference being detected as other than 180°.