US 11,990,831 B2
Hybrid buck boost converter with reduced inductor current
Holger Petersen, Pastetten (DE)
Assigned to Renesas Design (UK) Limited, Bourne End (GB)
Filed by Dialog Semiconductor (UK) Limited, London (GB)
Filed on Jul. 28, 2022, as Appl. No. 17/875,797.
Application 17/875,797 is a continuation in part of application No. 17/396,591, filed on Aug. 6, 2021, abandoned.
Prior Publication US 2023/0045186 A1, Feb. 9, 2023
Int. Cl. H02M 3/07 (2006.01); H02M 1/00 (2006.01)
CPC H02M 1/0095 (2021.05) [H02M 3/07 (2013.01)] 27 Claims
OG exemplary drawing
 
1. A power converter for providing an output voltage with a target conversion ratio, the power converter being operable in a first mode as a step-down converter or in a second mode as a step-up converter, the power converter comprising a ground port, a first port and a second port;
an inductor having a first terminal connected to the second port;
a flying capacitor coupled to a network of switches comprising
a first switch to couple a first terminal of the flying capacitor to the first port;
a second switch to couple a second terminal of the flying capacitor to the first port;
a third switch to couple the first terminal of the flying capacitor to the second terminal of the inductor;
a fourth switch to couple the second terminal of the flying capacitor to the second terminal of the inductor;
a fifth switch to couple the second terminal of the flying capacitor to the ground port;
a sixth switch to couple the first terminal of the flying capacitor to the second port; and
a driver adapted to drive the network of switches with a sequence of states during a drive period, wherein depending on the mode of operation the sequence of states comprises at least one of a first state and a second state;
wherein in the first state the ground port is coupled to the second port via a first path and a second path, the first path comprising the flying capacitor and the inductor, and the second path comprising the flying capacitor while bypassing the inductor;
wherein in the second state the first port is coupled to the second port via a third path that includes the inductor and wherein the ground port is coupled to the first port via a fourth path that includes the flying capacitor while bypassing the inductor.