Control of power converter based on dynamic constraint factors

Patent metadata

Field	Value
Publication number	US-11515707-B2
Application number	US-202117493129-A
Country	US
Kind code	B2
Filing date	Oct 4, 2021
Priority date	Jul 29, 2020
Publication date	Nov 29, 2022
Grant date	Nov 29, 2022

Abstract

A power delivery system may include a power converter configured to electrically couple to a power source and further configured to supply electrical energy to one or more loads electrically coupled to an output of the power converter, and control circuitry configured to select a constraint factor from a plurality of different constraint factors based on at least one of an input voltage to the power converter and a power level available to the power converter, and control the power converter in accordance with the constraint factor.

First claim

What is claimed is:

1. A portable electronic device, comprising:
one or more components;
a battery;
a power converter configured to electrically couple to and receive power from the battery and further configured to supply electrical energy to the one or more components; and
control circuitry configured to:
select a constraint factor from a plurality of different constraint factors based on at least one of an input voltage to the power converter and a power level available to the power converter; and
control the power converter in accordance with the constraint factor.

2. The portable electronic device of claim 1 , wherein
the control circuitry is configured to select the constraint factor based on a voltage level available from the battery.

3. The portable electronic device of claim 2 , wherein the control circuitry models the voltage level available from the battery as a time-varying voltage source in series with an equivalent resistance.

4. The portable electronic device of claim 2 , wherein:
a plurality of constraint regions are defined for different ranges of the voltage level available from the battery; and
the control circuitry is configured to select the constraint factor based on a constraint region of the plurality of constraint regions corresponding to the voltage level available from the battery.

5. The portable electronic device of claim 4 , wherein a first constraint region of the plurality of constraint regions is associated with a first constraint factor which corresponds to a battery-imposed limitation on maximum current.

6. The portable electronic device of claim 5 , wherein the first constraint region commences at a critical end-of-discharge voltage for the battery.

7. The portable electronic device of claim 5 , wherein the first constraint factor sets a maximum current limit for the power converter defined by:

I

C
⁢
E
⁢
L
⁢
L

-

M
⁢
A
⁢
X

=

V

C
⁢
E
⁢
L
⁢
L

-

E
⁢
F
⁢
F

-

V

C
⁢
ELL

-
MIN

R
0

where V CELL-EFF is an effective battery voltage at a given instance, V CELL-MIN is the critical end-of-discharge voltage for the battery, and R 0 is an equivalent series resistance of the battery.

8. The portable electronic device of claim 4 , wherein a second constraint region of the plurality of constraint regions is associated with a second constraint factor which corresponds to a power converter stability-imposed limitation on maximum current.

9. The portable electronic device of claim 8 , wherein the second constraint factor sets a maximum current limit for the power converter defined by:

I

P
⁢
M
⁢
A
⁢
X

=

V

C
⁢
E
⁢
L
⁢
L

-

E
⁢
F
⁢
F

2
⁢

(

R
0

+

R

T
⁢
R
⁢
A
⁢
C
⁢
E

+

R

S
⁢
N
⁢
S

+

R

L
⁢
O
⁢
S
⁢
S

)

where R 0 is an equivalent series resistance of the battery, R TRACE is a resistance of a trace and/or connector resistance between the power source and the power converter, R SNS is a resistance of a current sense resistor, and R LOSS is a resistance modeling losses of the power converter.

10. The portable electronic device of claim 8 , wherein:
a first constraint region of the plurality of constraint regions is associated with a first constraint factor which corresponds to a battery-imposed limitation on maximum current; and
the second constraint region commences at an intersection of the first constraint factor and the second constraint factor.

11. The portable electronic device of claim 4 , wherein a third constraint region of the plurality of constraint regions is associated with a third constraint factor which corresponds to an output-power-based limitation on maximum current.

12. The portable electronic device of claim 11 , wherein the third constraint factor sets a maximum current limit for the power converter defined by:

I

C
⁢
ELL

-
LIM

Assignees

• Cirrus Logic Int Semiconductor Ltd
• Cirrus Logic Inc

Inventors

• Mackay Graeme G
• Sharma Ajit
• Lawrence Jason W
• King Eric J

Classifications

• H02J7/865

  Battery or charger load switching, e.g. concurrent charging and load supply (H02J7/50 takes precedence) · CPC title

• H02J2105/52

  for limitation of the power consumption in the networks or in one section of the networks, e.g. load shedding or peak shaving · CPC title

• H02J7/96

  in response to battery voltage · CPC title

• H02J7/965

  obtained with the battery disconnected from the charge or discharge circuit · CPC title

• H02J7/63

  against overdischarge · CPC title