Switching converter, control circuit and control method thereof
AssigneeSilergy Semiconductor Technology (Hangzhou) LTD
InventorsFusong Huang, Kailang Hang
Life of this patent
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Abstract
A method of controlling a switching converter having a plurality of interleaved parallel branches, can include controlling conduction phases of power switches of the plurality of interleaved parallel branches to be overlapped when a load changes from a light load to a heavy load, in order to improve dynamic response performance of the switching converter. A control circuit for a switching converter with a plurality of interleaved parallel branches, can control conduction phases of power switches of the interleaved parallel branches to be overlapped when a load changes from a light load to a heavy load, in order to improve dynamic response performance of the switching converter.
Claims16
A method of controlling a switching converter having a plurality of interleaved parallel branches, the method comprising:
- a) controlling conduction phases of power switches of the plurality of interleaved parallel branches to be overlapped when a load changes from a light load to a heavy load, in order to improve dynamic response performance of the switching converter;
- b) determining a turn-on moment of the power switch of each interleaved parallel branch in accordance with a compensation signal and a ripple signal, wherein the compensation signal is configured to characterize a difference between an output voltage of the switching converter and an expected value of the output voltage, and the ripple signal is obtained in accordance with the output voltage and voltages at intermediate nodes of each of the interleaved parallel branches;
- c) shielding on-time control signals corresponding to each interleaved parallel branch when the compensation signal is continuously greater than the ripple signal;
- and
- d) controlling the power switches of remaining interleaved parallel branches to be turned on when a time that the compensation signal is continuously greater than the ripple signal is greater than a predetermined time threshold.
A control circuit for a switching converter, wherein the switching converter comprises a plurality of interleaved parallel branches, wherein the control circuit is configured to control conduction phases of power switches of the interleaved parallel branches to be overlapped when a load changes from a light load to a heavy load, in order to improve dynamic response performance of the switching converter, wherein the control circuit comprises:
- a) a plurality of shield circuits configured to shield on-time control signals corresponding to the power switches of each interleaved parallel branch when a set signal is active, such that the power switches of the interleaved parallel branches that are turned on remain to be turned on;
- b) a plurality of phase overlap circuits configured to generate an active phase overlap trigger signal after detecting that the on-time of the power switch of any interleaved parallel branch is greater than a predetermined time threshold;
- and
- c) a plurality of logic circuits, each of which corresponds to one interleaved parallel branch, and being configured to control the power switch of the corresponding interleaved parallel branch to be turned on after receiving the active phase overlap trigger signal.
Dependencies are inferred from the claim text.