Three-phase or single-phase electric charger system for electric or hybrid vehicle

Patent metadata

Field	Value
Publication number	US-2018281609-A1
Application number	US-201815941493-A
Country	US
Kind code	A1
Filing date	Mar 30, 2018
Priority date	Apr 3, 2017
Publication date	Oct 4, 2018
Grant date	—

Abstract

An electric system to charge a battery on a vehicle provides for a three-phase alternating-direct converter comprising input terminals connected to an outside power grid, a high output terminal and a low output terminal, a direct-direct converter made up of two direct-direct converter circuits, a first converter circuit having a high input terminal connected to the high output terminal of the alternating-direct converter and a second converter circuit having a low input terminal connected to the low output terminal of the alternating-direct converter, the low input terminal of the first direct-direct converter circuit being connected to the high input terminal of the second direct-direct converter circuit, and the high output terminal of the first converter circuit being connected to the high output terminal of the second converter circuit and the low output terminal of the first converter circuit being connected to the low output terminal of the second converter circuit.

First claim

What is claimed is:

1 . An electric charger system intended to charge a battery from an outside power grid, in particular intended to be on board an electric or hybrid vehicle to charge battery, driving the vehicle, from a power grid outside said vehicle, said electric system comprising:
a three-phase alternating-direct converter comprising input terminals intended to be connected to an outside power grid, a high output terminal and a low output terminal, a direct-direct converter, said direct-direct converter having two direct-direct converter circuits, a first direct-direct converter circuit having a high input terminal connected to the high output terminal of the alternating-direct converter and a second direct-direct converter circuit having a low input terminal connected to the low output terminal of the alternating-direct converter, the low input terminal of the first direct-direct converter circuit being connected to the high input terminal of the second direct-direct converter circuit, and the high output terminal of the first converter circuit being connected to the high output terminal of the second direct-direct converter circuit and the low output terminal of the first converter circuit being connected to the low output terminal of the second direct-direct converter circuit.

2 . The electric charger system according to claim 1 , wherein the direct-direct converter is configured so that, in a three-phase operating mode, said first and second direct-direct converters receive current delivered by the alternating-direct converter, and so that, in a single-phase operating mode, only one of said first and second direct-direct converter circuits receives current delivered by the alternating-direct converter.

3 . The electric charger system according to claim 2 , comprising at least one switch configured to short-circuit the input of one of said first and second direct-direct converter circuits in the single-phase operating mode.

4 . The electric charger system according to claim 3 , wherein said switch connects the high output terminal of the alternating-direct converter or the low output terminal of the alternating-direct converter to the connection point between the low input terminal of the first direct-direct converter circuit and the high input terminal of the second converter circuit, and in which, in the single-phase operating mode, the switch is on so as to short-circuit the input of the direct-direct converter circuit between the input terminals of which the switch is connected.

5 . The electric charger system according to claim 1 , wherein each direct-direct converter circuit comprises a primary circuit and a secondary circuit, said primary circuit being connected in series between the high output terminal and the low output terminal of the three-phase alternating-direct converter, and said secondary circuit being connected in parallel, between a high output terminal and a low output terminal of said LLC direct-direct converter.

6 . The electric charger system according to claim 5 , wherein said first and second direct-direct converter circuits each consist of a resonant circuit.

7 . The electric charger system according to claim 1 , wherein said first and second direct-direct converter circuits are configured to operate with interleaving.

8 . The electric charger system according to claim 7 , wherein said first and second direct-direct converter circuits are configured to operate with interleaving in the three-phase operating mode.

9 . The electric charger system according to claim 7 , wherein said first and second direct-direct converter circuits are phase-shifted by 90°.

10 . The electric charger system according to claim 1 , wherein the three-phase alternating-direct converter comprises at least one inductance per phase, each inductance having a first terminal forming an input terminal of the alternating-direct converter, and a second terminal connected to an arm, said arm being connected between the high output terminal and the low output terminal of the alternating-direct converter of the three-phase alternating-direct converter.

11 . The electric charger system according to claim 10 , wherein each arm comprises two switches so as to connect the corresponding inductance on the one hand to the high output terminal of the alternating-direct converter, via a respective switch, and on the other hand to the low output terminal of the alternating-direct converter, via a respective switch.

12 . The electric charger system according to claim 1 , wherein the three-phase alternating-direct converter comprises a Vienna-type circuit and an intermediate output terminal.

13 . The electric charger system according to claim 12 ,
wherein the direct-direct converter is configured so that, in a three-phase operating mode, said first and second direct-direct converters receive current delivered by the alternating-direct converter, and so that, in a single-phase operating mode, only one of said first and second direct-direct converter circuits receives current delivered by the alternating-direct converter; wherein at least one switch configured to short-circuit the input of one of said first and second direct-direct converter circuits in the single-phase operating mode; and wherein the direct-direct converter circuit that is not short-circuited by the switch comprises a capacitive arm connected between the high input terminal and the low input terminal of said direct-direct converter circuit, the system including a second switch connected to the intermediate output terminal and configured so as, in the three-phase operating mode, to connect the intermediate output terminal with the connection point between the two direct-direct converter circuits; and, in the single-phase operating mode, so as to connect the intermediate output terminal with a midpoint of the capacitive arm of the direct-direct converter that is not short-circuited by the switch.

14 . The electric charger system according to claim 1 , wherein the direct-direct converter circuit is galvanically isolated.

Assignees

• Valeo Siemens Eautomotive France Sas

Inventors

• Yang Gang
• Bouchez Boris

Classifications

• B60L2210/10

  DC to DC converters · CPC title

• H02M3/285

  Single converters with a plurality of output stages connected in parallel (parallel operation of a plurality of converters in DC distribution networks H02J1/10) · CPC title

• B60L53/22

  Constructional details or arrangements of charging converters specially adapted for charging electric vehicles · CPC title

• B60L2210/30

  AC to DC converters · CPC title

• B60L53/11

  DC charging controlled by the charging station, e.g. mode 4 · CPC title