US 12,246,609 B2
Charging device and method for operating the charging device
Thomas Plum, Cologne (DE)
Assigned to Robert Bosch GmbH, Stuttgart (DE)
Appl. No. 17/767,701
Filed by Robert Bosch GmbH, Stuttgart (DE)
PCT Filed Sep. 15, 2020, PCT No. PCT/EP2020/075752
§ 371(c)(1), (2) Date Apr. 8, 2022,
PCT Pub. No. WO2021/069183, PCT Pub. Date Apr. 15, 2021.
Claims priority of application No. 10 2019 215 645.2 (DE), filed on Oct. 11, 2019.
Prior Publication US 2023/0322105 A1, Oct. 12, 2023
Int. Cl. B60L 53/24 (2019.01); B60L 53/22 (2019.01); H02M 3/335 (2006.01)
CPC B60L 53/24 (2019.02) [B60L 53/22 (2019.02); H02M 3/335 (2013.01); B60L 2210/30 (2013.01); B60L 2210/40 (2013.01)] 9 Claims
OG exemplary drawing
 
1. A charging device (100) having:
an input-side first terminal (110_1, 110_2) for connection to an electrical energy source (200),
an output-side second terminal (190_1, 190_2) for connection to a battery (300) to be charged,
a transformer (150), the primary winding (150_1) of which is electrically connected to the first terminal (110_1, 110_2) by means of a primary circuit (400) and the secondary winding (150_2) of which is electrically connected to the second terminal (190_1, 190_2) by means of a secondary circuit (500),
wherein the primary circuit (400) comprises a rectification circuit (405) and a parallel connection of two branches each having a high-side element and a low-side element, having:
a first branch which comprises a first and a second series-connected capacitor (422, 424) having a first center tap (426) between the capacitors, which first center tap is connected to a first connection pole (152) of the primary winding (150_1),
a second branch which comprises a series-connected first low-side switching element (S1) and a second series-connected high-side switching element (S2) having a second center tap (436) between the switching elements, which second center tap is connected to a second connection pole (154) of the primary winding (150_1),
wherein the intrinsic diodes of the first and of the second switching element (S1, S2) are aligned such that a flow from the low side to the high side is made possible,
wherein the secondary circuit (500) comprises a parallel connection of two branches each having a high-side element and a low-side element, having:
a third branch which comprises a series connection of a first high-side diode (512) and of a third low-side switching element (S3) having a third center tap (516) between the first diode and the third switching element, which third center tap is connected to a second connection pole (158) of the secondary winding (150_2),
wherein the first diode (512) and the intrinsic diode of the third switching element (S3) are aligned such that a flow from the low side to the high side is made possible,
a fourth branch which comprises a series connection of a second high-side diode (522) and of a fourth low-side switching element (S4) having a fourth center tap (526) between the second diode (522) and the fourth switching element (S4), which fourth center tap is connected to a first connection pole (156) of the secondary winding (150_2),
wherein the second diode (522) and the intrinsic diode of the fourth switching element (S4) are aligned such that a flow from the low side to the high side is made possible,
wherein a first connection pole (190_1) of the second terminal (190_1, 190_2) is connected to the cathodes of the first and second diode (512, 522) and a second connection pole (190_2) of the second terminal (190_1, 190_2) is connected to the third and fourth switching elements (S3, S4) at the ends of the third and fourth branch.