Dual active bridge converter control with intra-bridge phase shift

Patent metadata

Field	Value
Publication number	US-11870352-B2
Application number	US-202117341629-A
Country	US
Kind code	B2
Filing date	Jun 8, 2021
Priority date	Jun 8, 2021
Publication date	Jan 9, 2024
Grant date	Jan 9, 2024

Abstract

Systems and methods for controlling a dual active bridge converter are disclosed herein. An output voltage of a dual active bridge converter is sensed. Based at least in part on the output voltage, a target intra-bridge phase shift amount between two bridges of the dual active bridge converter is computed. A plurality of switch control signals, which are provided to respective switches of the dual active bridge converter, are caused to switch according to a time-based switching sequence based on the target intra-bridge phase shift amount to compensate for variations in the output voltage.

First claim

What is claimed is:

1. A method for controlling a dual active bridge converter, comprising:
selecting, based on a voltage transfer ratio, an intra-bridge phase shift computation algorithm from among a plurality of stored intra-bridge phase shift computation algorithms;
computing, based on the selected intra-bridge phase shift computation algorithm, a target intra-bridge phase shift amount between two bridges of the dual active bridge converter; and
causing a plurality of switch control signals, which are provided to respective switches of the dual active bridge converter, to switch according to a time-based switching sequence based on the target intra-bridge phase shift amount to compensate for variations in an output voltage.

2. The method of claim 1 , wherein the computed target intra-bridge phase shift amount is further based on a rule stored in memory that maps output voltages of the dual active bridge converter to respective target intra-bridge phase shift amounts associated with zero voltage switching for the respective output voltages, and wherein the time-based switching sequence is a zero voltage switching sequence generated based on the target intra-bridge phase shift amount.

3. The method of claim 1 , further comprising:
sensing the output voltage of the dual active bridge converter; and
computing the voltage transfer ratio based on the output voltage and an input voltage of the dual active bridge converter.

4. The method of claim 1 , wherein selecting the intra-bridge phase shift computation algorithm comprises:
determining whether the voltage transfer ratio satisfies a threshold; and
selecting the intra-bridge phase shift computation algorithm from among the plurality of stored intra-bridge phase shift computation algorithms, based on whether the voltage transfer ratio satisfies the threshold.

5. The method of claim 4 , wherein selecting the intra-bridge phase shift computation algorithm further comprises:
selecting a first intra-bridge phase shift computation algorithm in response to determining that the voltage transfer ratio satisfies the threshold, and
selecting a second intra-bridge phase shift computation algorithm, distinct from the first intra-bridge phase shift computation algorithm, in response to determining that the voltage transfer ratio does not satisfy the threshold.

6. The method of claim 3 , wherein determining the input voltage comprises at least one of: detecting a signal level at an input port of the dual active bridge converter that receives power from an electrical power grid or retrieving an input voltage value stored in memory.

7. The method of claim 3 , further comprising:
determining an updated value of at least one of the input voltage or the output voltage of the dual active bridge converter; and
in response to determining the updated value of at least one of the input voltage or the output voltage of the dual active bridge converter:
computing, based on the updated value of at least one of the input voltage and the output voltage of the dual active bridge converter, an updated target intra-bridge phase shift amount between the two bridges of the dual active bridge converter; and
causing the plurality of switch control signals, which are provided to the dual active bridge converter, to switch according to an updated time-based switching sequence based on the updated target intra-bridge phase shift amount.

8. The method of claim 1 , further comprising:
determining a target effective phase shift based on a target power transfer amount,
wherein the target intra-bridge phase shift amount is computed further based at least in part on the target effective phase shift.

9. The method of claim 3 , wherein sensing the output voltage comprises detecting a signal level at an output port of the dual active bridge converter that is coupled to a rechargeable battery.

10. The method of claim 1 , wherein causing the plurality of switch control signals to switch according to the time-based switching sequence comprises selectively switching in succession respective ones of the plurality of control signals at respective times within a time period based on the target intra-bridge phase shift amount.

11. A system for controlling a dual active bridge converter, comprising:
a memory storing instructions;
an input port coupled to an output port of the dual active bridge converter;
a plurality of output ports coupled to switches of the dual active bridge converter; and
control circuitry coupled to the memory, the input port, and the plurality of output ports and configured execute the stored instructions to:
select, based on a voltage transfer ratio, an intra-bridge phase shift computation algorithm from among a plurality of intra-bridge phase shift computation algorithms stored in the memory;
compute, based on the selected intra-bridge phase shift computation algorithm, a target intra-bridge phase shift amount between two bridges of the dual active bridge converter; and
cause a plurality of switch control signals, which are provided to respective switches of the dual active bridge converter via the plurality of output ports, to switch according to a time-based switching sequence based on the target intra-bridge phase shift amount to compensate for variations in an output voltage.

12. The system of claim 11 , wherein the computed target intra-bridge phase shift amount is further based on a rule stored in the memory that maps output voltages of the dual active bridge converter to respective intra-bridge phase shift amounts associated with zero voltage switching for the respective output voltages, and wherein the time-based switching sequence is a zero voltage switching sequence generated based on the target intra-bridge phase shift amount.

13. The system of claim 11 , wherein the control circuitry is further configured to:
determine the output voltage of the dual active bridge converter via the input port; and
compute the voltage transfer ratio based on the output voltage and an input voltage of the dual active bridge converter.

14. The system of claim 11 , wherein the control circuitry is configured to select the intra-bridge phase shift computation algorithm by:
determining whether the voltage transfer ratio satisfies a threshold; and
selecting the intra-bridge phase shift computation algorithm from among the plurality of stored intra-bridge phase shift computation algorithms, based on whether the voltage transfer ratio satisfies the threshold.

15. The system of claim 14 , wherein the control circuitry is further configured to select the intra-bridge phase shift computation algorithm by:
selecting a first intra-bridge phase shift computation algorithm in response to determining that the voltage transfer ratio satisfies the threshold, and
selecting a second intra-bridge phase shift computation algorithm, distinct from the first intra-bridge phase shift computation algorithm, in response to determining that the voltage transfer ratio does not satisfy the threshold.

16. The system of claim 13 , further comprising a second input port configured to receive power from an electrical power grid, wherein the control circuitry is further configured to determine the input voltage of the dual active bridge converter by at least one of:
detecting a signal level at the second input port; or
retrieving an input voltage value stored in the memory.

17. The system of claim 11 , wherein the control circuitry is further configured to determine a target effective phase shift based on a target power transfer amount, wherein the control circ

Assignees

• Rivian Ip Holdings Llc

Inventors

• Mohan Vishnu
• Sangsefidi Younes
• Yeh Chia-Chou
• Liu Yang
• Schulz Steven

Classifications

• H02M3/33569 Primary

  having several active switching elements (H02M3/3353 takes precedence) · CPC title

• H02M1/0012

  Control circuits using digital or numerical techniques (in DC/DC converters H02M3/157, H02M3/33515; in DC-AC converters H02M7/53873) · CPC title

• H02M3/33573 Primary

  Full-bridge at primary side of an isolation transformer · CPC title

• Y02T10/7072

  Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors · CPC title

• Y02T10/70

  Energy storage systems for electromobility, e.g. batteries · CPC title