Device for the electric power supply of a load and associated method

Patent metadata

Field	Value
Publication number	US-10050439-B2
Application number	US-201415025317-A
Country	US
Kind code	B2
Filing date	Sep 30, 2014
Priority date	Sep 30, 2013
Publication date	Aug 14, 2018
Grant date	Aug 14, 2018

Abstract

A device (10) for the electric power supply of a load (11), includes at least two energy storage elements (13, 14), elements for determining the power needs of the load (11), elements (16, 17) for monitoring each energy storage element (13, 14), which are able to provide information about a maximum instantaneous power of each energy storage element (13, 14), a calculation body (19) for determining a maximum secured power according to the electromotive force (Ebat(t)) and the resistance (Rbat(t)) of the Thévenin model, a maximum specified current and a maximum specified voltage, and elements (Cbat(t), Csc(t)) for controlling each energy storage element (13, 14), the elements being adjusted over time according to the power needs of the load (11) and the maximum secured power of each energy storage element (13, 14).

First claim

The invention claimed is:

1. A device for the electric power supply ( 10 ) of a load ( 11 ), said device comprising:
at least first and second energy storage elements ( 13 , 14 ) connected to said load ( 11 ), said first and second energy storage elements ( 13 , 14 ) comprising a maximum specified discharge current (Ibat.max) and a minimum specified voltage (Vbat.min) guaranteeing a life of said first and second energy storage elements ( 13 , 14 );
a first converter ( 30 ) connected to the first energy storage element ( 13 ) to define a power (Pbat(t)) delivered by the first energy storage element ( 13 );
a second converter ( 31 ) connected to the second energy storage element ( 14 ) to define a power (Psc(t)) delivered by the second energy storage element ( 14 );
a calculation body ( 19 ) having a first input, a second input, a third input connected to the load ( 11 ), a first output connected to control the first converter ( 30 ), and a second output connected to control the second converter ( 31 );
a first monitor ( 16 ) connected to the first input of the calculation body, the first monitor providing, via the first input, information about a maximum instantaneous power (Pbat.max(t)) that can be requested of said first energy storage element ( 13 ), said first monitor ( 16 ) further providing information about an electromotive force (Ebat(t)) and a resistance (Rbat(t)) of a Thévenin equivalent model of said first energy storage element ( 13 ) reflecting an internal state and a state of health of said first energy storage element ( 13 ); and
a second monitor ( 17 ) connected to the second input of the calculation body, the second monitor providing, via the second input, information about a maximum instantaneous power (Pbat.max(t)) that can be requested of said second energy storage element ( 14 ), said second monitor ( 17 ) further providing information about an electromotive force (Ebat(t)) and a resistance (Rbat(t)) of a Thévenin equivalent model of said second energy storage element ( 14 ) reflecting an internal state and a state of health of said second energy storage element ( 14 ),
wherein the calculation body:
i) determines power needs (Pchg(t)) of said load ( 11 ),
ii) determines, for each of the first and second energy storage elements( 13 , 14 ), a maximum secured power (Pbat.max.spec(t)) according to the electromotive force (Ebat(t)) and to the resistance (Rbat(t)), according to the maximum specified current (Ibat.max) and to the minimum specified voltage (Vbat.min), and
iii) controls (Cbat(t), Csc(t)) respectively the first and second converters ( 30 , 31 ) for controlling each of the first and second energy storage elements ( 13 , 14 ) to define the power (Pbat(t), Psc(t)) respectively delivered by said first and second energy storage elements ( 13 , 14 ), and
wherein said control (Cbat(t), Csc(t)) are adjusted over time (t) according to the power needs (Pchg(t)) of said load ( 11 ) and to the maximum secured power (Pbat.max.spec(t)) of each energy storage element ( 13 , 14 ).

2. The device as claimed in claim 1 , wherein since said first and second energy storage elements ( 13 , 14 ) comprise a maximum specified recharging current (Ibat.max.rech) and a maximum specified recharging voltage (Vbat.max.rech) guaranteeing a life of said energy storage elements ( 13 , 14 ), the calculation body ( 19 ) is able to determine, for each of said first and second energy storage elements ( 13 , 14 ), the maximum secured recharging power (Pbat.max.rech.spec(t)) according to the electromotive force (Ebat(t)) and to the resistance (Rbat(t)) reflecting the internal state and the state of health of each energy storage element ( 13 , 14 ), according to the maximum specified recharging current (Ibat.rech.max) and to the maximum specified recharging voltage (Vbat.rech.max), said control (Cbat(t), Csc(t)) from said calculation body ( 19 ) being adjusted over time (t) according to the power needs (Pchg(t)) of said load ( 11 ), to the maximum secured power (Pbat.max.spec(t)) and to the maximum secured recharging power (Pbat.max.rech.spec(t)) of each of said first and second energy storage elements ( 13 , 14 ).

3. The device as claimed in claim 1 , wherein each of said first and second energy storage elements ( 13 , 14 ) is a battery, a set of supercapacitors or a fuel cell.

4. The device as claimed in claim 1 , wherein the electromotive force (Ebat(t)) of the Thévenin equivalent model of each of said first and second energy storage elements ( 13 , 14 ) is determined by a law of behavior expressed according to the utilization of the energy storage element ( 13 , 14 ).

5. The device as claimed in claim 2 , wherein the first and second monitors ( 16 , 17 ) are able to provide information about an internal state of each of said first and second energy storage elements ( 13 , 14 ), the calculation body ( 19 ) being able to determine an electromotive force (Ebat(t)) and a resistance (Rbat(t)) of the Thévenin equivalent model of each of said first and second energy storage elements ( 13 , 14 ) according to the internal state of each of said first and second energy storage elements ( 13 , 14 ), said control (Cbat(t), Csc(t)) being adjusted over time (t) according to the electromotive force (Ebat(t)) and to the resistance (Rbat(t)).

6. The device as claimed in claim 5 , wherein the electromotive force (Ebat(t)) and the resistance (Rbat(t)) are variable over time (t).

7. The device as claimed in claim 5 , wherein said maximum secured power (Pbat.max.spec(t)) is determined by the following equation:

Pbat
.
max
.
spec

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(
t
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min
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2

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bat
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(
t
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Rbat
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(
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,

(

Ebat
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Vbat
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min

Assignees

• Airbus Group Sas
• Airbus Defence & Space Sas

Inventors

• Fleury Benoit
• Massiot Gregor
• Lancelevee Pierre-Bertrand
• Labbe Julien

Classifications

• H02J7/977

  of the battery · CPC title

• H02J7/865

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

• H02J7/855 Primary

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

• H02J7/933 Primary

  the cycle being controlled or terminated in response to electric parameters · CPC title

• H02J7/345

  using capacitors as storage or buffering devices · CPC title