US 12,218,573 B2
Control circuit for DC-DC converters with nonlinear adaptive voltage position and control method thereof
Lijie Jiang, Hangzhou (CN); Fangyu Zhang, Hangzhou (CN); and Ming Chen, Hangzhou (CN)
Assigned to Chengdu Monolithic Power Systems Co., Ltd., Sichuan (CN)
Filed by Chengdu Monolithic Power Systems Co., Ltd., Chengdu (CN)
Filed on Oct. 14, 2022, as Appl. No. 17/966,031.
Claims priority of application No. 202111284124.3 (CN), filed on Nov. 1, 2021.
Prior Publication US 2023/0138397 A1, May 4, 2023
Int. Cl. H02M 3/156 (2006.01); H02M 1/00 (2006.01); H02M 1/08 (2006.01)
CPC H02M 1/0025 (2021.05) [H02M 1/0009 (2021.05); H02M 1/08 (2013.01); H02M 3/156 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A control circuit for a DC-DC converter, wherein the DC-DC converter comprises at least one switch, and is configured to receive an input voltage and to provide an output voltage and an output current, the control circuit comprising:
an adaptive voltage position (AVP) control circuit, configured to provide a position signal based on the output voltage, the output current, a voltage identification code and a set of adaptive voltage control commands, wherein the set of adaptive voltage control commands comprises a load line data; and
a switching control circuit, configured to provide a switching control signal based on the position signal to control the at least one switch of the DC-DC converter; wherein
when the output current is smaller than a first current threshold, the control circuit is configured to choose one of a first voltage position curve, a second voltage position curve, and a third voltage position curve as a load line of the output voltage versus the output current according to the load line data, when the output current is larger than the first current threshold and smaller than a second current threshold, the control circuit is configured to choose one of a remaining two voltage position curves of the first voltage position curve, the second voltage position curve, and the third voltage position curve as the load line according to the load line data, and when the output current is larger than the second current threshold, the control circuit is configured to choose a remaining voltage position curve of the first voltage position curve, the second voltage position curve, and the third voltage position curve as the load line according to the load line data, and the control circuit is further configured to control the output voltage to vary along the load line as the output current varies.