Isolated high voltage DC/DC converter with battery current control module components for charging traction battery
An automotive power system has a first circuit arrangement including an AC/DC power converter, a transformer, a first switching bridge connected between the AC/DC power converter and transformer, and a second switching bridge connected between a traction battery and transformer such that the first switching bridge, transformer, and second switching bridge form an isolated DC/DC power converter.
1 . An automotive power system comprising:
a first switching bridge;
a first circuit arrangement including an AC/DC power converter, a transformer, a second switching bridge connected between the AC/DC power converter and the transformer, and a plurality of switches connected with an output of the transformer and configured to connect the output with the first switching bridge such that the first switching bridge is connected between a traction battery and the transformer, and the first switching bridge, the transformer, and the second switching bridge form an isolated DC/DC power converter;
an electromagnetic interference filter;
one or more switches, different than the plurality of switches, configured to directly connect the traction battery between the AC/DC power converter and the second switching bridge via the electromagnetic interference filter;
an active ripple energy storage circuit, including an inductor, connected between the AC/DC power converter and the one or more switches; and
a second circuit arrangement including a coil magnetically coupled with the inductor, a third switching bridge, and a switch, different than the plurality of switches and the one or more switches, connected between the coil and the third switching bridge.
2 . The automotive power system of claim 1 , wherein the active ripple energy storage circuit includes a pair of capacitors and a switch, different than the plurality of switches, the one or more switches, and the switch connected between the coil and the third switching bridge, configured to electrically connect the pair in parallel.
3 . The automotive power system of claim 2 , wherein the inductor, one of the pair, and the switch configured to electrically connect th pair in parallel share a node.
4 . The automotive power system of claim 1 , wherein the active ripple energy storage circuit includes a pair of capacitors and a pair of switches, different than the plurality of switches, the one or more switches, and the switch connected between the coil and the third switching bridge, wherein a first of the pair of capacitors and a first of the pair of switches are electrically connected in series, and wherein a second of the pair of capacitors and a second of the pair of switches are electrically connected in series.
5 . The automotive power system of claim 4 , wherein the inductor, the first of the pair of switches, and the second of the pair of capacitors share a node.
6 . The automotive power system of claim 1 further comprising a DC bus and an electromagnetic filter connected between the third switching bridge and the DC bus.
7 . The automotive power system of claim 1 , wherein the coil is magnetically coupled with the inductor such that a magnetic coupling between the coil and inductor is 0.7 or less.
8 . The automotive power system of claim 1 , wherein the third switching bridge is a bidirectional switching bridge.
9 . The automotive power system of claim 1 , wherein the second circuit arrangement is configured such that the switch connected between the coil and the third switching bridge is open when a single-phase AC source is connected with the first circuit arrangement.
10 . A method comprising:
responsive to a single-phase AC source being connected with a first circuit arrangement that includes an AC/DC power converter, a transformer, a first switching bridge connected between the AC/DC power converter and the transformer, and a plurality of switches connected with an output of the transformer and configured to connect the output with a second switching bridge such that the second switching bridge is connected between a traction battery and the transformer, and the first switching bridge, the transformer, and the second switching bridge form an isolated DC/DC power converter, opening a switch, different than the plurality of switches, of a second circuit arrangement that includes a coil magnetically coupled with an inductor of an active ripple energy storage circuit connected between the AC/DC power converter and the first switching bridge to disconnect a DC bus from the coil.
11 . The method of claim 10 , further comprising, after the single-phase AC source is disconnected from the first circuit arrangement, closing the switch of the second circuit arrangement.
12 . A vehicle comprising:
a traction battery;
a first circuit arrangement including an AC/DC power converter, a transformer, a first switching bridge connected between the AC/DC power converter and the transformer, and a second switching bridge connected between the traction battery and the transformer such that the first switching bridge, the transformer, and the second switching bridge form an isolated DC/DC power converter;
an active ripple energy storage circuit, including an inductor, connected between the AC/DC power converter and the second switching bridge; and
a second circuit arrangement including a coil magnetically coupled with the inductor, a third switching bridge, and a switch connected between the coil and third switching bridge.
13 . The vehicle of claim 12 , wherein the active ripple energy storage circuit includes a pair of capacitors and a switch, different than the switch connected between the coil and third switching bridge, configured to electrically connect the pair in parallel.
14 . The vehicle of claim 13 , wherein the inductor, one of the pair, and the switch configured to electrically connect the pair in parallel share a node.
15 . The vehicle of claim 12 , wherein the active ripple energy storage circuit includes a pair of capacitors and a pair of switches different than the switch connected between the coil and third switching bridge, wherein a first of the pair of capacitors and a first of the pair of switches are electrically connected in series, and wherein a second of the pair of capacitors and a second of the pair of switches are electrically connected in series.
16 . The vehicle of claim 15 , wherein the inductor, the first of the pair of switches, and the second of the pair of capacitors share a node.
17 . The vehicle of claim 12 further comprising a DC bus and an electromagnetic filter connected between the third switching bridge and the DC bus.
18 . The vehicle of claim 12 , wherein the coil is magnetically coupled with the inductor such that a magnetic coupling between the coil and inductor is 0.7 or less.
19 . The vehicle of claim 12 , wherein the third switching bridge is a bidirectional switching bridge.