Non-contact type charger
There is provided a non-contact type charger including: a plurality of power transmitting coils transmitting power in a non-contact manner; a plurality of switching units connected to the plurality of power transmitting coils, respectively, to switch power transmitted by corresponding power transmitting coils; and a switching control unit controlling power switching of the switching units, depending on coupling coefficients between each of the plurality of power transmitting coils and a plurality of power receiving coils which receive the power transmitted by the plurality of power transmitting coils to charge a plurality of battery cells connected thereto with power.
1. A non-contact type charger comprising:
a plurality of power transmitting coils configured to transmit power in a non-contact manner;
a plurality of switching units connected to the plurality of power transmitting coils, respectively, to switch power to be transmitted by the plurality of power transmitting coils; and
a switching control unit configured to control power switching of the plurality of switching units, depending on coupling coefficients between each of the plurality of power transmitting coils and a plurality of power receiving coils,
wherein the switching control unit calculates the coupling coefficients using a matrix equation to define a relationship between the plurality of power transmitting coils and the plurality of power receiving coils,
wherein the switching control unit calculates the coupling coefficients using the following matrix equation,
[
V
R
x
1
V
R
x
2
⋮
V
R
x
N
]
=
[
C
11
C
12
…
C
1
N
C
21
C
22
…
C
2
N
⋮
⋮
⋮
C
N
1
C
N
2
…
C
N
N
]
[
V
T
x
1
V
T
x
2
⋮
V
T
x
N
]
,
and
wherein V Rx1 to V RxN indicate voltage levels of power applied to power receiving coils or battery cells of power receiving units Rx 1 to RxN, V Tx1 to V TxN indicate voltage levels of power applied to power transmitting coils of power transmitting units Tx 1 to TxN, and C 11 to C NN indicate coupling coefficients between the charger and the battery, that is, between the power receiving units Rx 1 to RxN and the power transmitting units Tx 1 to TxN.
2. The non-contact type charger of claim 1 , wherein the switching control unit controls at least one of a voltage level, a switching duty, a switching on-off dead time, and a switching frequency of the power input to each of the plurality of switching units.
3. The non-contact type charger of claim 2 , wherein the switching control unit controls at least one of a voltage level, a switching duty, a switching on-off dead time, and a switching frequency of power input to one of the plurality of switching units to differ from at least one of a voltage level, a switching duty, a switching on-off dead time, and a switching frequency of power input to another of the plurality of switching units.
4. The non-contact type charger of claim 1 , wherein the switching control unit sequentially turns on/off the power transmitting units Tx 1 and Tx 2 , and calculates the coupling coefficients by searching for a power receiving unit receiving the highest amount of power.
5. The non-contact type charger of claim 1 , further comprising a communications unit receiving the coupling coefficients.
6. The non-contact type charger of claim 1 , further comprising a communications unit receiving information on the received power,
wherein the switching control unit sets the coupling coefficients on the basis of the information received from the communications unit.
7. A non-contact type charger comprising:
a plurality of power transmitting units each including:
a power unit configured to supply direct current (DC) power,
a switching unit configured to switch the DC power supplied by the power unit,
a power transmitting coil configured to transmit the power in a non-contact manner, depending on the power switching of the switching unit, and
a detecting unit configured to detect a power state change of the power transmitting coil; and
a control unit configured to control the power switching of the switching unit by setting a coupling coefficient between the power transmitting coil and a power receiving coil, depending on a detection result of the detecting unit
wherein the control unit calculates the coupling coefficients using a matrix equation to define a relationship between a plurality of power transmitting coils and a plurality of power receiving coils,
wherein the control unit calculates the coupling coefficients using a matrix equation to define a relationship between a plurality of power transmitting coils and a plurality of power receiving coils,
wherein the control unit calculates the coupling coefficients using the following matrix equation,
[
V
R
x
1
V
R
x
2
⋮
V
R
x
N
]
=
[
C
11
C
12
…
C
1
N
C
21
C
22
…
C
2
N
⋮
⋮
⋮
C
N
1
C
N
2
…
C
N
N
]
[
V
T
x
1
V
T
x
2
⋮
V
T
x
N
]
,
and
wherein VRx 1 to VRxN indicate voltage levels of power a plied to power receiving coils or battery cells of power receiving units Rx 1 to RxN, VTx 1 to VTxN indicate voltage levels of power applied to power transmitting coils of power transmitting units Tx 1 to TxN, and C 11 to CNN indicate coupling coefficients between the charger and the battery, that is, between the power receiving units Rx 1 to RxN and the power transmitting units Tx 1 to TxN.
8. The non-contact type charger of claim 7 , wherein the control unit controls at least one of a voltage level, a switching duty, a switching on-off dead time, and a switching frequency of power input to one of the switching units of the plurality of power transmitting units to differ from at least one of a voltage level, a switching duty, a switching on-off dead time, and a switching frequency of power input to another of the switching units.
9. The non-contact type charger of claim 7 , wherein the control unit selectively operates one of the plurality of power transmitting units to calculate coupling coefficients between the corresponding power transmitting coil and a plurality of power receiving coils.
10. The non-contact type charger of claim 7 , wherein the control unit selectively varies power transmitted by one of the plurality of power transmitting units to calculate coupling coefficients between the corresponding power transmitting coil and a plurality of power receiving coils.
11. The non-contact type charger of claim 7 , wherein the detecting unit detects a power state of the power transmitting coil varied depending on a power state change of each of a plurality of power receiving coils receiving the power transmitted by the power transmitting coil.
12. A non-contact type charger comprising:
a plurality of power transmitting coils configured to transmit power in a non-contact manner;
a plurality of switching units connected to the plurality of power transmitting coils, respectively, to switch power to be transmitted by the plurality of power transmitting coils; and
a switching control unit configured to control power switching of the plurality of switching units, depending on coupling coefficients between each of the plurality of power transmitting coils and a plurality of power receiving coils,
wherein the switching control unit calculates the coupling coefficients using a matrix equation to define a relationship between the plurality of power transmitting coils and the plurality of power receiving coils,
wherein the switching control unit calculates the coupling coefficients using the following matrix equation,
[
Δ
V
R
x
1
Δ
V
R
x
2
⋮
Δ
V
R
x
N
]
=
[
C
11
C
12
…
C
1
N
C
21
C
22
…
C
2
N
⋮
⋮
⋮
C
N
1
C
N
2
…
C
N
N
]
[
Δ
V
T
x
1
Δ
V
T
x
2
⋮
Δ
V
T
x
N
]
wherein ΔV Rx1 to ΔV RxN indicate changes in voltage levels of power applied to power receiving coils or battery cells of power receiving units Rx 1 to RxN, ΔV Tx1 to ΔV TxN indicate changes in voltage levels of power applied to power transmitting coils of power transmitting units Tx 1 to TxN, and C 11 to C NN indicate coupling coefficients between the charger and the battery, that is, between the power receiving units Rx 1 to RxN and the power transmitting units Tx 1 to TxN.
13. The non-contact type charger of claim 12 , wherein the switching control unit sequentially varies power transmitted by the power transmitting units Tx 1 and Tx 2 , and calculates the coupling coefficients by searching for a power receiving unit receiving the highest changes in voltage levels of power.
14. A non-contact type charger comprising:
a plurality of power transmitting units each including:
a power unit configured to supply direct current (DC) power,
a switching unit configured to switch the DC power supplied by the power unit,
a power transmitting coil configured to transmit the power in a non-contact manner, depending on the power switching of the switching unit, and
a detecting unit configured to detect a power state change of the power transmitting coil; and
a control unit configured to control the power switching of the switching unit by setting a coupling coefficient between the power transmitting coil and a power receiving coil, depending on a detection result of the detecting unit,
wherein the control unit calculates the coupling coefficients using the following matrix equation,
[
Δ
V
R
x
1
Δ
V
R
x
2
⋮
Δ
V
R
x
N
]
=
[
C
11
C
12
…
C
1
N
C
21
C
22
…
C
2
N
⋮
⋮
⋮
C
N
1
C
N
2
…
C
N
N
]
[
Δ
V
T
x
1
Δ
V
T
x
2
⋮
Δ
V
T
x
N
]
wherein ΔV Rx1 to ΔV RxN indicate changes in voltage levels of power applied to power receiving coils or battery cells of power receiving units Rx 1 to RxN, ΔV Tx1 to ΔV TxN indicate changes in voltage levels of power applied to power transmitting coils of power transmitting units Tx 1 to TxN, and C 11 to C NN indicate coupling coefficients between the charger and the battery, that is, between the power receiving units Rx 1 to RxN and the power transmitting units Tx 1 to TxN.