Granted Patent B2

US 12,512,762 · App. 17/638,928 · Granted Dec 30, 2025

Inventors: Christian Winter (Tamm, DE); Jan Riedel (Esslingen am Neckar, DE)

Assignee: Robert Bosch GmbH

H02M3/33573H02M3/33576H02M3/33584H02M3/33592H02M1/0058

Abstract

Claims (30)

1 . A method for controlling a DC-DC converter having a primary-side full-bridge, a secondary-side full-bridge, and a transformer, which is arranged between the primary-side full-bridge and the secondary-side full-bridge, wherein the method comprises the following steps:

closing two upper switching elements or two lower switching elements of the primary-side full-bridge to short-circuit the primary-side full-bridge;

controlling, by closing, a first diagonal branch in the secondary-side full-bridge while the primary side of the transformer is short-circuited;

subsequently, closing a first diagonal branch of the primary-side full-bridge and opening a first switching element of the two upper switching elements or the two lower switching elements of the primary-side full-bridge, wherein opening of the first switching element of the two upper switching elements or the two lower switching elements of the primary-side full-bridge occurs prior to closing one switching element of the first diagonal branch of the primary-side full-bridge, and wherein the closing of the one switching element of the first diagonal branch of the primary-side full-bridge occurs after a dead time;

subsequently, closing the other of the two upper switching elements or the two lower switching elements of the primary-side full-bridge to short-circuit the primary-side full-bridge;

subsequently, opening all of the switching elements in the secondary-side full-bridge;

subsequently, controlling, by closing, a second diagonal branch in the secondary-side full-bridge while the primary side of the transformer is short-circuited by means of the primary-side full-bridge, wherein the second diagonal branch of the secondary-side full-bridge is complementary to the first diagonal branch of the secondary-side full-bridge;

subsequently, closing a second diagonal branch of the primary-side full-bridge, wherein the second diagonal branch of the primary-side full-bridge is complementary to the first diagonal branch of the primary-side full-bridge, wherein the second diagonal branch of the primary-side full-bridge is closed after a dead time;

subsequently, short-circuiting the primary side of the transformer by means of the primary-side full-bridge; and

subsequently, opening all of the switching elements in the secondary-side full-bridge.

2 . The method as claimed in claim 1 , wherein the closing of the first diagonal branch of the primary-side full-bridge takes place once the first diagonal branch of the secondary-side full-bridge has been controlled for a predetermined time period.

3 . The method as claimed in claim 1 , wherein an opening of the switching elements of the secondary-side full-bridge takes place as soon as an electrical current in the transformer has decayed.

4 . The method as claimed in claim 1 , wherein an opening of the switching elements of the secondary-side full-bridge takes place before an electrical current in the transformer has decayed.

5 . The method of claim 1 , wherein controlling the first diagonal branch in the secondary-side full-bridge comprises closing the first diagonal branch in the primary-side full-bridge while the second diagonal branch in the secondary-side full-bridge remains open.

6 . The method of claim 1 , wherein the DC-DC converter includes an inductor, which is arranged between a connecting point of two upper switching elements of the secondary side full-bridge of the DC-DC converter and a first terminal of the secondary side full-bridge of the DC-DC converter.

7 . A DC-DC converter, comprising:

a primary-side full-bridge;

a secondary-side full-bridge;

a transformer, which is arranged between the primary-side full-bridge and the secondary-side full-bridge, and

a control device configured to

close two upper switching elements or two lower switching elements of the primary-side full-bridge to short-circuit the primary-side full-bridge;

control, by closing, a first diagonal branch in the secondary-side full-bridge while the primary side of the transformer is short-circuited;

subsequently, close a first diagonal branch of the primary-side full-bridge and opening a first switching element of the two upper switching elements or the two lower switching elements of the primary-side full-bridge, wherein opening of the first switching element of the two upper switching elements or the two lower switching elements of the primary-side full-bridge occurs prior to closing one switching element of the first diagonal branch of the primary-side full-bridge, and wherein the closing of the one switching element of the first diagonal branch of the primary-side full-bridge occurs after a dead time;

subsequently, close the other of the two upper switching elements or the two lower switching elements of the primary-side full-bridge to short-circuit the primary-side full-bridge;

subsequently, open all of the switching elements in the secondary-side full-bridge;

subsequently, control, by closing, a second diagonal branch in the secondary-side full-bridge while the primary side of the transformer is short-circuited by means of the primary-side full-bridge, wherein the second diagonal branch of the secondary-side full-bridge is complementary to the first diagonal branch of the secondary-side full-bridge;

subsequently, close a second diagonal branch of the primary-side full-bridge, wherein the second diagonal branch of the primary-side full-bridge is complementary to the first diagonal branch of the primary-side full-bridge, wherein the second diagonal branch of the primary-side full-bridge is closed after a dead time;

subsequently, short-circuit the primary side of the transformer by means of the primary-side full-bridge; and

subsequently, open all of the switching elements in the secondary-side full-bridge.

8 . The DC-DC converter of claim 7 , wherein control of the first diagonal branch in the secondary-side full-bridge comprises closing the first diagonal branch in the primary-side full-bridge while the second diagonal branch in the secondary-side full-bridge remains open.

Assignments (1)

Priority Claims (1)

Continuity (1)

References Cited (36)