| 摘要 |
A power conversion circuit uses smaller, cheaper, and faster analog and digital circuits, e.g., buffers, comparators, and processing circuits, to provide the information necessary to control a multilevel power converter faster, cheaper, and with a smaller footprint than conventional techniques. For example, a current detection circuit indirectly measures a direction of a current through an inductor connected between midpoint node and an output node of a multilevel power converter based on comparisons between voltages associated with the multilevel power converter. A capacitor voltage detection detects a capacitor voltage across the flying capacitor to generate a logic signal based on a comparison between the capacitor voltage and a first reference voltage. A control circuit selects an operating state of the multilevel power converter to regulate a first capacitor voltage across the first capacitor based on the indirectly measured direction of the inductor current, the logic signal, and an input command signal. |
| 主权项 |
1. A power conversion circuit comprising:
a multilevel power converter comprising a first capacitor connected in parallel with a plurality of power switches serially connected between a top power switch and a bottom power switch, and an inductor connected between an output node and a midpoint node connected at a midpoint of the plurality of power switches, the multilevel power converter having three or more levels; a current detection circuit configured to indirectly measure a direction of a current through the inductor based on one of a comparison between a first voltage and a top voltage associated with the top power switch and a comparison between a second voltage and a bottom voltage associated with the bottom power switch; a first capacitor voltage detection circuit connected in parallel with the first capacitor and configured to detect a first capacitor voltage across the first capacitor and to generate a first logic signal based on a comparison between the first capacitor voltage and a first reference voltage; and a control circuit connected to an input of each of the power switches, the control circuit configured to select an operating state of the multilevel power converter to regulate the first capacitor voltage across the first capacitor and to generate a target voltage level at the midpoint node based on the indirectly measured direction of the inductor current, the first logic signal, and an input command signal. |
