Switching Converter Control

摘要

A device and method for operating a switching power converter are disclosed. In an embodiment a circuit includes a switching power converter having a half bridge including a high-side semiconductor switch connected to a low-side semiconductor switch and an inductor coupled to a half-bridge output node. The circuit further includes a control circuit configured to generate drive signals to switch the high-side semiconductor switch and the low-side semiconductor switch on and off, wherein the drive signals are generated to ensure a dead time between a switch-off of the low-side switch and a subsequent switch-on of the high side switch, and wherein the dead time is set to a first value, when an inductor current is negative at a time of switching, and the dead time is set to a second value, which is lower than the first value, when the inductor current is positive at the time of switching.

主权项

1. A circuit comprising:
a switching power converter comprising:
a half bridge comprising a high-side semiconductor switch connected to a low-side semiconductor switch; andan inductor coupled to a half bridge output node; and a controller configured to generate drive signals to switch the high-side switch and the low-side switch on and off for operating the switching power converter in continuous conduction mode (CCM), wherein the drive signals are generated to ensure a dead time between a switch-off of the low-side switch and a subsequent switch-on of the high-side switch, and wherein, in CCM, the dead time is set to a first value, when an inductor current is negative at a time of switching, and the dead time is set to a second value, which is lower than the first value, when the inductor current is positive at the time of switching.