Generalized single-side compensation networks for inductive wireless power transfer systems

1 . A method for efficiently compensating an Inductive Wireless Power Transfer (IWPT) system, comprising:

a) providing an LCT having a primary side and a secondary side;

b) providing a DC power supply for feeding input DC power to said IWPT system;

c) providing an inverter that converts said input DC power to AC power at a predetermined operating frequency;

d) connecting the output of said inverter to a self-inductance (L P ) of the primary side of said LCT via a compensation network consisting of a combination of capacitors and at least one inductor and residing solely at said primary side, wherein the compensation network is configured to compensate for voltage drops across the self-inductance (L P ) of the primary side and secondary-side equivalent inductances as reflected to the primary side, with no additional compensating capacitors or inductors on the secondary side;

e) providing a rectifier for converting AC power, induced at the secondary side of said LCT, to DC power;

f) connecting the input of said rectifier to a self-inductance (L S ) of said secondary side of said LCT;

g) connecting a load to the output of said rectifier; and

h) feeding DC power to the input of said inverter and generating an induced power that is fed to said load.

2 . The method according to claim 1 , wherein the compensation network comprises:

a) a first inductor (L P2 ) connected in parallel to the input of said primary side;

b) a first capacitor (C P1 ) connected in series with said self-inductance (L P1 ) of said primary side, for compensating voltage drops across the self-inductance (L P1 ) of the primary side;

c) a second capacitor (C P3 ) connected in series with said first capacitor (C P1 ), for compensating voltage drops across the reflection (L C3 ) of the self-inductance of the secondary side to the primary side; and

d) a third capacitor (C P2 ), one contact of which being connected to one contact of the primary coil of said LCT, and the other contact of which being connected to the mutual point connecting between said second capacitor (C P3 ) and said first capacitor (C P1 ), for compensating voltage drops across said first inductor (L P2 ).

3 . The method according to claim 1 , further comprising connecting a compensation inductance (L) in series between the output of the inverter and a compensating capacitance (C P3 ), for absorbing unwanted high voltage spikes.

4 . The method according to claim 1 , wherein the inductances to be compensated at the primary side are

L

P

=

(

1

-

k

⁢

α

-

1

)

⁢

L

1

,

L

C

=

k

⁢

α

-

1

⁢

L

1

,

L

S

=

(

1

-

α

⁢

k

)

⁢

L

2

,

n

=

α

⁢

L

2

L

1

with an arbitrary a residing within

k

⁢

L

2

L

1

≤

α

≤

1

k

⁢

L

2

L

1

.

5 . The method according to claim 1 , wherein the compensating capacitors are selected as

C

P

⁢

1

=

1

ω

2

⁢

L

P

⁢

1

=

1

ω

2

(

1

-

k

⁢

α

1

)

⁢

L

1

,

C

P

⁢

2

=

1

ω

2

⁢

L

P

⁢

2

=

1

ω

2

⁢

k

⁢

α

-

1

⁢

L

1

,

C

P

⁢

3

=

1

ω

2

(

L

P

⁢

3

+

L

)

=

1

ω

2

(

1

-

α

⁢

k

α

2

⁢

L

1

+

L

)

.

_

6 . The method according to claim 1 , wherein the compensating capacitors are selected as

C

S

⁢

1

=

1

ω

2

⁢

L

S

⁢

1

=

1

ω

2

(

1

-

α

⁢

k

)

⁢

L

2

,

C

S

⁢

2

=

1

ω

2

⁢

L

S

⁢

2

=

1

ω

2

⁢

α

⁢

kL

2

,

C

S

⁢

3

=

1

ω

2

(

L

S

⁢

3

+

L

)

=

1

ω

2

(

(

1

-

k

⁢

α

1

)

⁢

α

2

⁢

L

2

+

L

)

.

_

7 . The method according to claim 1 , wherein the inverter output impedance at operating frequency is given by

Z

→

inv

(

ω

)

=

1

n

2

⁢

(

R

L

+

j

(

ω

⁢

L

+

ω

⁢

L

S

⁢

3

-

1

ω

⁢

C

S

⁢

3

)

)

.

_

8 . The method according to claim 1 , wherein the inverter phase angle is given by

φ

=

arg

⁢

Z

→

inv

(

ω

)

=

tg

-

1

⁢

ω

⁢

L

+

ω

⁢

L

S

⁢

3

-

(

ω

⁢

C

S

⁢

3

)

-

1

R

L

.

9 . The method according to claim 1 , wherein a load-independent voltage gain under sinusoidal excitation is given by

G

V

=

❘

"\[LeftBracketingBar]"

v

→

rec

❘

"\[RightBracketingBar]"

❘

"\[LeftBracketingBar]"

v

→

inv

❘

"\[RightBracketingBar]"

=

❘

"\[LeftBracketingBar]"

n

❘

"\[RightBracketingBar]"

=

❘

"\[LeftBracketingBar]"

α

⁢

L

2

L

1

❘

"\[RightBracketingBar]"

.

_

10 . A method for efficiently compensating an Inductive Wireless Power Transfer (IWPT) system, comprising:

a) providing an LCT having a primary side and a secondary side;

b) providing a DC power supply for feeding input DC power to said IWPT system;

c) providing an inverter that converts said input DC power to AC power at a predetermined operating frequency;

d) connecting the output of said inverter to a self-inductance of the primary side of said LCT;

e) providing a rectifier for converting AC power, induced at the secondary side of said LCT, to DC power;

f) connecting the input of said rectifier to a self-inductance of said secondary side of said LCT via a compensation network consisting of a combination of capacitors and at least one inductor and residing solely at said secondary side, wherein the compensation network is configured to compensate for voltage drops across the self-inductance of said secondary side and primary-side equivalent inductances as reflected to the secondary side, with no additional compensating capacitors or inductors on the primary side;

g) connecting a load to the output of said rectifier; and

h) feeding DC power to the input of said inverter and generating an induced power that is fed to said load.

11 . The method according to claim 10 , wherein the compensation network comprises:

a) a first inductor (L S2 ) connected in parallel to the input of said primary side;

b) a first capacitor (C S1 ) connected in series with said self-inductance (L S1 ) of said primary side, for compensating voltage drops across the self-inductance (L S1 ) of the primary side;

c) a second capacitor (C S3 ) connected in series with said first capacitor (C S1 ), for compensating voltage drops across the reflection (L S3 ) of the self-inductance of the secondary side to the primary side; and

d) a third capacitor (C S2 ), one contact of which being connected to one contact of the primary coil of said LCT, and the other contact of which being connected to the mutual point connecting between said second capacitor (C S3 ) and said first capacitor (C S1 ), for compensating voltage drops across said first inductor (L S2 ).

12 . The method according to claim 10 , wherein the compensation network comprises:

a) a first capacitor (C P1 ) connected in series with the self-inductance (L 1 ) of said primary side, for compensating voltage drops across the self-inductance (L 1 ) of the primary side;

b) an inductor (L) connected in series with the output of said inverter; and

c) a second capacitor (C P2 ), one contact of which being connected to one contact of the primary coil of said LCT, and the other contact of which being connected to the mutual point connecting between said first capacitor (C P1 ) and said inductor (L).

13 . The method according to claim 10 , wherein the compensation network comprises:

a) a first capacitor (C S1 ) connected in series with the self-inductance (L 2 ) of said primary side, for compensating voltage drops across the self-inductance (L 2 ) of the secondary side;

b) an inductor (L) connected in series with the input of said rectifier; and

c) a second capacitor (C S2 ), one contact of which being connected to one contact of a secondary coil of said LCT, and the other contact of which being connected to the mutual point connecting between said first capacitor (C S1 ) and said inductor (L).

14 . An efficiently compensated Inductive Wireless Power Transfer (IWPT) system, comprising:

a) an LCT having a primary side and a secondary side;

b) an inverter that converts said input DC power to AC power at a predetermined operating frequency, the output of said inverter is being connected to a self-inductance (L P ) of the primary side of said LCT via a compensation network consisting of a combination of capacitors and at least one inductor and residing solely at said primary side, wherein the compensation network is configured to compensate for voltage drops across the self-inductance (L P ) of the primary side and secondary-side equivalent inductances as reflected to the primary side, with no additional compensating capacitors or inductors on the secondary side;

c) a rectifier for converting AC power, induced at the secondary side of said LCT, to DC power, the input of said rectifier is being connected to a self-inductance (L S ) of said secondary side of said LCT;

d) a load being connected to the output of said rectifier; and

e) a DC power supply for feeding DC power to the input of said inverter and generating an induced power that is fed to said load.

15 . The system according to claim 14 , wherein the compensation network comprises:

a) a first inductor (L P2 ) connected in parallel to the input of said primary side;

b) a first capacitor (C P1 ) connected in series with said self-inductance (L P1 ) of said primary side, for compensating voltage drops across the self-inductance (L P1 ) of the primary side;

c) a second capacitor (C P3 ) connected in series with said first capacitor (C P1 ), for compensating voltage drops across the reflection (L C3 ) of the self-inductance of the secondary side to the primary side; and

d) a third capacitor (C P2 ), one contact of which being connected to one contact of the primary coil of said LCT, and the other contact of which being connected to the mutual point connecting between said second capacitor (C P3 ) and said first capacitor (C P1 ), for compensating voltage drops across said first inductor (L P2 ).

16 . The system according to claim 14 , further comprising a compensation inductance (L) connected in series between the output of the inverter and the compensating capacitance (C P3 ), for absorbing unwanted high voltage spikes.

17 . The system according to claim 14 , in which the compensation network comprises:

a) a first capacitor (C P1 ) connected in series with the self-inductance (L 1 ) of said primary side, for compensating voltage drops across the self-inductance (L 1 ) of the primary side;

b) an inductor (L) connected in series with the output of said inverter; and

c) a second capacitor (C P2 ), one contact of which being connected to one contact of the primary coil of said LCT, and the other contact of which being connected to the mutual point connecting between said first capacitor (C P1 ) and said inductor (L).

18 . A system for efficiently compensating an Inductive Wireless Power Transfer (IWPT) system, comprising:

a) an LCT having a primary side and a secondary side;

b) an inverter that converts input DC power to AC power at a predetermined operating frequency, the output of said inverter is being connected to a self-inductance of the primary side of said LCT;

c) a rectifier for converting AC power, induced at the secondary side of said LCT, to DC power, the input of said rectifier is being connected to a self-inductance of said secondary side of said LCT via a compensation network consisting of a combination of capacitors and at least one inductor and residing solely at said secondary side, wherein the compensation network is configured to compensate for voltage drops across the self-inductance of said secondary side and primary-side equivalent inductances as reflected to the secondary side, with no additional compensating capacitors or inductors on the primary side;

d) a load, being connected to the output of said rectifier; and

e) a DC power supply for feeding DC power to the input of said inverter and generating an induced power that is fed to said load.

19 . The system according to claim 18 , in which the compensation network comprises:

a) a first inductor (L S2 ) connected in parallel to the input of said primary side;

b) a first capacitor (C S1 ) connected in series with said self-inductance (L S1 ) of said primary side, for compensating voltage drops across the self-inductance (L s1 ) of the primary side;

c) a second capacitor (C S3 ) connected in series with said first capacitor (C S1 ), for compensating voltage drops across the reflection (L S3 ) of the self-inductance of the secondary side to the primary side; and

d) a third capacitor (C S2 ), one contact of which being connected to one contact of the primary coil of said LCT, and the other contact of which being connected to the mutual point connecting between said second capacitor (C S3 ) and said first capacitor (C S1 ), for compensating voltage drops across said first inductor (L S2 ).

20 . The system according to claim 18 , in which the compensation network comprises:

a) a first capacitor (C S1 ) connected in series with the self-inductance (L 2 ) of said primary side, for compensating voltage drops across the self-inductance (L 2 ) of the secondary side;

b) an inductor (L) connected in series with the input of said rectifier; and

c) a second capacitor (C S2 ), one contact of which being connected to one contact of a secondary coil of said LCT, and the other contact of which being connected to the mutual point connecting between said first capacitor (C S1 ) and said inductor (L).