Hybrid optimized control for dc-dc converter

Patent metadata

Field	Value
Publication number	US-12463445-B2
Application number	US-202217709593-A
Country	US
Kind code	B2
Filing date	Mar 31, 2022
Priority date	Sep 2, 2021
Publication date	Nov 4, 2025
Grant date	Nov 4, 2025

Abstract

Systems and methods for controlling a dual active bridge converter or other type of DC-DC converter are disclosed herein. An output voltage of the dual active bridge converter is detected. Based at least in part on the output voltage, a first target duty ratio of a primary bridge of the dual active bridge converter and a second target duty ratio of a secondary bridge of the dual active bridge converter are retrieved from a table. Based on the output voltage, a target phase shift between the primary bridge and the secondary bridge is determined. Based on the first target duty ratio, the second target duty ratio, and the target phase shift, a plurality of switch control signals is caused to be provided to respective switches of the primary bridge and the secondary bridge, to switch according to a time-based switching sequence.

First claim

What is claimed is:

1 . A method for controlling a dual active bridge converter, comprising:
detecting an output voltage of the dual active bridge converter; retrieving, from a predetermined lookup table stored in memory prior to detecting the output voltage, a first target duty ratio of a primary bridge of the dual active bridge converter and a second target duty ratio of a secondary bridge of the dual active bridge converter associated with the output voltage; determining a target phase shift between the primary bridge and the secondary bridge, based on the output voltage; and causing a plurality of switch control signals, which are provided to respective switches of the primary bridge and the secondary bridge, to switch according to a time-based switching sequence based on the first target duty ratio, the second target duty ratio, and the target phase shift.

2 . The method of claim 1 , wherein each of the first target duty ratio, the second target duty ratio, and the target phase shift is associated with a desired output current of the dual active bridge converter in the predetermined lookup table.

3 . The method of claim 2 , wherein the desired output current is selected from among a maximum output current of the dual active bridge converter and a maximum output power of the dual active bridge converter, based on the output voltage.

4 . The method of claim 1 , wherein the determining the target phase shift comprises retrieving, from the predetermined lookup table, the target phase shift based on the output voltage.

5 . The method of claim 1 , wherein the determining the target phase shift further comprises retrieving a phase shift from the predetermined lookup table and adjusting the retrieved phase shift based on a comparison between the output voltage and a reference voltage.

6 . The method of claim 1 , wherein the predetermined lookup table comprises a plurality of reference voltages and a plurality of reference currents, and wherein the determining the target phase shift comprises calculating the target phase shift based on a first comparison between the output voltage and a reference voltage of the plurality of reference voltages and a second comparison between an output current of the dual active bridge converter and a reference current of the plurality of reference currents.

7 . The method of claim 1 , further comprising determining, in advance of providing the plurality of switch control signals to the respective switches of the primary bridge and the secondary bridge, values in the predetermined lookup table by using a generalized-harmonic approximation (GHA) model to optimize a plurality of control variables.

8 . The method of claim 7 , wherein the determining the values in the predetermined lookup table comprises determining, for each voltage at predetermined intervals within a voltage operating range of the dual active bridge converter, the plurality of control variables for at least one output current of the dual active bridge converter by minimizing an expression representing a primary winding current of the dual active bridge converter, the plurality of control variables comprising the first target duty ratio, the second target duty ratio, and the target phase shift.

9 . The method of claim 8 , wherein the minimizing the primary winding current comprises minimizing:

I
RMS

=

∑

k
=
1

2
⁢
i

+
1

〈

V
pri

〉

k
2

+

〈

V
sec

〉

k
2

-

2
⁢

〈

V
pri

〉

k

⁢

〈

V
sec

〉

k

⁢

cos
⁡
(

k
⁢
φ

)

2
⁢

k
2

⁢
π
⁢

f
s

⁢
L

,

where:
I RMS is the primary winding current,

〈

V
pri

〉

k

=

4
⁢

V
in

k
⁢
π

⁢

cos
⁡
(

k
⁢

δ
1

)

Assignees

• Rivian Ip Holdings Llc

Inventors

• Zou Shenli
• Mobarrez Maziar
• Schulz Steven
• Mohajerani Zahra

Classifications

• H02J7/90 Primary

  Regulation of charging or discharging current or voltage · CPC title

• H02M3/33576 Primary

  having at least one active switching element at the secondary side of an isolation transformer · CPC title

• H02M3/33584

  Bidirectional converters · CPC title

• H02J2207/20

  Charging or discharging characterised by the power electronics converter · CPC title

• B60L53/14

  Conductive energy transfer · CPC title