US 12,244,235 B2
Control method for a DC-DC converter and dc-dc converter
Christian Winter, Tamm (DE); Jan Riedel, Esslingen Am Neckar (DE); Christoph Kienzler, Gerlingen (DE); and David Cello, Stuttgart (DE)
Assigned to Robert Bosch GmbH, Stuttgart (DE)
Appl. No. 17/633,491
Filed by Robert Bosch GmbH, Stuttgart (DE)
PCT Filed Jul. 23, 2020, PCT No. PCT/EP2020/070756
§ 371(c)(1), (2) Date Feb. 7, 2022,
PCT Pub. No. WO2021/028181, PCT Pub. Date Feb. 18, 2021.
Claims priority of application No. 10 2019 211 968.9 (DE), filed on Aug. 9, 2019.
Prior Publication US 2022/0360181 A1, Nov. 10, 2022
Int. Cl. H02M 3/335 (2006.01); H02M 1/00 (2006.01); H02M 1/08 (2006.01)
CPC H02M 3/33573 (2021.05) [H02M 1/0058 (2021.05); H02M 1/08 (2013.01); H02M 3/33584 (2013.01); H02M 3/33592 (2013.01)] 9 Claims
OG exemplary drawing
 
1. A method (100) for controlling a phase-shifted full-bridge DC-DC converter (1) for an energy transmission from a secondary side, having a first secondary terminal (21) and a second secondary terminal (22), to a primary side, having a first primary terminal (11) and a second primary terminal (12), of the DC-DC converter (1),
wherein the primary side of the DC-DC converter (1) includes a first full-bridge (30) having a first switching element (S1) arranged between the first primary terminal (11) of the DC-DC converter (1) and a first node (31) of the first full-bridge (30) and a second switching element (S2) arranged between the first node (31) and the second primary terminal (12),
wherein a transformer (50) is arranged between the primary side and the secondary side of the DC-DC converter (1), wherein a first primary terminal (51) of a primary side of the transformer (50) is directly connected to the first node (31) of the first full-bridge (30), and
wherein the method (100) comprises electrically connecting, in a switching state, the first primary terminal (51) of the primary side of the transformer (50) and a second primary terminal (52) of the primary side of the transformer (50) to one another, electrically connecting, in the switching state, a first secondary terminal (53) of a secondary side of the transformer (50) and a second secondary terminal (54) of the secondary side of the transformer (50), and electrically connecting the first secondary terminal (21) of the secondary side of the phase-shifted full-bridge DC-DC converter (1) and a second secondary terminal (22) of the secondary side of the phase-shifted full-bridge DC-DC converter (1) to one another,
wherein the method (100) comprises the following steps as a sequence of switching states:
controlling, by turning on, a first diagonal branch of the first full-bridge (30) of the primary side of the DC-DC converter (1) and a first diagonal branch of a second full-bridge (40) of the secondary side of the DC-DC converter (1), wherein energy is transferred from the secondary side of the DC-DC converter (1) to the primary side of the DC-DC converter (1);
controlling, by turning on, a second diagonal branch of the second full-bridge (40) of the secondary side of the DC-DC converter (1); and
controlling, by turning off, a fourth switching element of the first full-bridge (30) of the primary side of the DC-DC converter (1) and, by turning on, a third switching element of the first full-bridge (30) of the primary side of the DC-DC converter (1), wherein the first diagonal branch of the first full-bridge (30) includes the fourth switching element, and wherein a second diagonal branch of the first full-bridge (30) includes the third switching element.