Bidirectional battery charge-discharge control

Patent metadata

Field	Value
Publication number	US-11569681-B2
Application number	US-202017112577-A
Country	US
Kind code	B2
Filing date	Dec 4, 2020
Priority date	Dec 4, 2020
Publication date	Jan 31, 2023
Grant date	Jan 31, 2023

Abstract

This disclosure includes novel ways of implementing a power supply that powers a load. More specifically, a power supply includes a bidirectional power converter and a controller. The controller monitors a magnitude of an input voltage supplied from an input voltage source to a load. Based on a magnitude of the input voltage, the controller switches between a first mode of operating the bidirectional power converter to charge an energy storage resource using (a portion of power provided by) the input voltage and a second mode of producing a backup voltage from the energy storage resource to power the load as a substitute to the input voltage such as when the input voltage is below a threshold value.

First claim

The invention claimed is:

1. An apparatus comprising:
a bidirectional power converter; and
a controller operative to:
i) monitor a magnitude of an input voltage supplied to a load from an input voltage source, and
ii) based on the magnitude of the input voltage, switch between a first mode of operating the bidirectional power converter to charge an energy storage resource using the input voltage and a second mode of producing a backup voltage from the energy storage resource to power the load;
wherein the controller is operative to switch from operating the bidirectional power converter in the first mode to operating the bidirectional power converter in the second mode in response to detecting that a magnitude of the input voltage falls below a threshold value;
wherein operation of the bidirectional power converter in the first mode includes conversion of the input voltage into a charge voltage that charges the energy storage resource; and
wherein operation of the bidirectional power converter in the second mode includes conversion of a supply voltage received from the energy storage resource into an auxiliary voltage, a combination of the auxiliary voltage and the supply voltage powering the load as a substitute to the input voltage.

2. The apparatus as in claim 1 , wherein at least one stage of the bidirectional power converter is regulated.

3. The apparatus as in claim 1 , wherein the bidirectional power converter includes:
a first power converter stage, the first power converter stage being a regulated power converter stage; and
a second power converter stage, the second power converter stage being an unregulated power converter stage.

4. The apparatus as in claim 1 , wherein the input voltage is a DC voltage; and
wherein the backup voltage is a DC voltage.

5. An apparatus comprising:
a bidirectional power converter; and
a controller operative to:
i) monitor a magnitude of an input voltage supplied to a load from an input voltage source, and
ii) based on the magnitude of the input voltage, switch between a first mode of operating the bidirectional power converter to charge an energy storage resource using the input voltage and a second mode of producing a backup voltage from the energy storage resource to power the load;

wherein the bidirectional power converter includes:
a first power converter stage, the first power converter stage being an unregulated power converter stage operative to produce an intermediate voltage from a supply voltage outputted from the energy storage resource; and
a second power converter stage, the second power converter stage being a regulated power converter stage operative to convert the intermediate voltage into a ground-isolated auxiliary voltage.

6. The apparatus as in claim 5 , wherein the second power converter stage includes an inverter operative to controllably switch a polarity of the ground-isolated auxiliary voltage.

7. The apparatus as in claim 5 , wherein the ground-isolated auxiliary voltage is offset with respect to a ground reference associated with the supply voltage outputted from the energy storage resource.

8. The apparatus as in claim 5 , wherein power delivered by the ground-isolated auxiliary voltage to the load decreases over time subsequent to initial activation of the bidirectional power converter in the second mode.

9. A method comprising:
monitoring a magnitude of an input voltage supplied to a load from an input voltage source; and
based on the magnitude of the input voltage, switching between: i) a first mode of operating a bidirectional power converter to charge an energy storage resource using the input voltage, and ii) a second mode of producing a backup voltage from the energy storage resource to power the load, the method further comprising:
via an unregulated power converter stage of the bidirectional power converter, producing an intermediate voltage from a supply voltage outputted from the energy storage resource while in the second mode; and
via a regulated power converter stage of the bidirectional power converter, converting the intermediate voltage into a ground-isolated auxiliary voltage.

10. The method as in claim 9 , wherein the switching includes:
in the first mode, controlling a first magnitude of power flow in a first direction from the input voltage through the bidirectional power converter to the energy storage resource; and
in the second mode, controlling a second magnitude of power flow in a second direction from the energy storage resource through the bidirectional power converter to produce the backup voltage.

11. The method as in claim 9 further comprising:
controllably switching a polarity of the isolated auxiliary voltage to generate the backup voltage.

12. The method as in claim 9 further comprising:
offsetting the intermediate voltage with respect to the supply voltage outputted from the energy storage resource to produce the backup voltage.

13. The method as in claim 9 , wherein an efficiency of producing the backup voltage increases over time subsequent to initial activation of the bidirectional power converter in the second mode.

14. The method as in claim 9 further comprising:
switching from operating the bidirectional power converter in the first mode to operating the bidirectional power converter in the second mode in response to detecting that the input voltage falls below a threshold value.

15. A controller operative to implement the method as claim 9 via control of a first power converter stage of the bidirectional power converter and control of a second power converter stage of the bidirectional power converter.

16. A method comprising:
monitoring a magnitude of an input voltage supplied to a load from an input voltage source;
based on the magnitude of the input voltage, switching between: i) a first mode of operating a bidirectional power converter to charge an energy storage resource using the input voltage, and ii) a second mode of producing a backup voltage from the energy storage resource to power the load, the method further comprising:
outputting a supply voltage from the energy storage resource to the bidirectional power converter, a magnitude of the supply voltage varying in a voltage range, a magnitude of the produced backup voltage falling within the voltage range during operation of the bidirectional power converter in the second mode.

17. An apparatus comprising:
a bidirectional power converter; and
a controller operative to:
i) monitor a magnitude of an input voltage supplied to a load from an input voltage source, and
ii) based on the magnitude of the input voltage, switch between a first mode of operating the bidirectional power converter to charge an energy storage resource using the input voltage and a second mode of producing a backup voltage from the energy storage resource to power the load;

wherein the bidirectional power converter includes a galvanic isolated power converter operative to convert a supply voltage received from the energy storage resource into an auxiliary voltage; and
wherein the bidirectional power converter is operative to produce the backup voltage using the auxiliary voltage.

18. An apparatus comprising:
a bidirectional power converter; and
a controller operative to:
i) monitor a magnitude of an input voltage supplied to a load from an input voltage source, and
ii) based on the magnitude of the input voltage, switch between a first mode of operating the bidirectional power converter to charge an energy storage resource using the input voltage and a second

Assignees

• Infineon Technologies Austria Ag

Inventors

• Kasper Matthias J
• Peluso Luca
• Deboy Gerald

Classifications

• H02J7/04

  Regulation of charging current or voltage · CPC title

• H02J9/062 Primary

  for AC powered loads · CPC title

• H02J2207/20

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

• H02M3/33584

  Bidirectional converters · CPC title

• H02J7/855

  with circuits adapted for supplying loads from the battery · CPC title