Electric power transmission device, and electric power reception device and vehicle including the same
In connection with a filter circuit, an inductance of a coil is set to Z 01 /ω, a capacitance of a capacitor is set to (a 1 +1)/(a 1 ·ω·Z 01 ), an inductance of a coil is set to a 1 ·Z 01 /ω, and a capacitance of a capacitor is set to (a 1 +1)/(a 1 2 ·ω·Z 01 ), where ω represents a frequency of an inverter, a 1 represents a ratio of an output voltage to an input voltage of the filter circuit, and Z 01 represents any design value.
1. An electric power transmission device, comprising:
an alternating-current power supply;
an electric power transmission portion configured to transmit in a non-contact manner, electric power output from said alternating-current power supply to an electric power reception device; and
a filter circuit provided between said alternating-current power supply and said electric power transmission portion,
said filter circuit including
first and second coils provided in at least one of a power line pair connected between said alternating-current power supply and said electric power transmission portion, and
first and second capacitors each connected between said power line pair and provided alternately with said first and second coils between said alternating-current power supply and said electric power transmission portion,
said first and second coils and said first and second capacitors being provided in an order of said first coil, said first capacitor, said second coil, and said second capacitor from a side of said alternating-current power supply, and
an inductance of said first coil being set to Z/ω,
a capacitance of said first capacitor being set to (a+1)/(aωZ),
an inductance of said second coil being set to aZ/ω, and
a capacitance of said second capacitor being set to (a+1)/(a 2 ωZ), where ω represents a frequency of said alternating-current power supply, a represents a ratio of an output voltage from said filter circuit to an input voltage to said filter circuit, and Z represents any design value.
2. The electric power transmission device according to claim 1 , wherein
said alternating-current power supply includes a voltage type inverter.
3. The electric power transmission device according to claim 2 , wherein
said a is determined based on a rated voltage of said voltage type inverter and a maximum value which is taken by a voltage of said electric power transmission portion.
4. The electric power transmission device according to claim 1 , wherein
said first coil is implemented by third and fourth coils resulting from division into two and provided in balance in both of said power line pair,
said second coil is implemented by fifth and sixth coils resulting from division into two and provided in balance in both of said power line pair,
an inductance of each of said third and fourth coils is set to Z/(2ω), and
an inductance of each of said fifth and sixth coils is set to aZ/(2ω).
5. The electric power transmission device according to claim 1 , further comprising a phase compensation coil provided on an output side of said alternating-current power supply, for suppressing phase advance of an output current from said alternating-current power supply.
6. The electric power transmission device according to claim 5 , wherein
said phase compensation coil is integrated with said first coil.
7. An electric power reception device, comprising:
an electric power reception portion configured to receive in a non-contact manner, alternating-current electric power output from an electric power transmission device;
a rectification portion rectifying alternating-current electric power received by said electric power reception portion; and
a filter circuit provided between said electric power reception portion and said rectification portion,
said filter circuit including
first and second coils provided in at least one of a power line pair connected between said electric power reception portion and said rectification portion, and
first and second capacitors each connected between said power line pair and provided alternately with said first and second coils between said electric power reception portion and said rectification portion,
said first and second coils and said first and second capacitors being provided in an order of said first capacitor, said first coil, said second capacitor, and said second coil from a side of said electric power reception portion, and
a capacitance of said first capacitor being set to 1/(ωZ),
an inductance of said first coil being set to (a+1)Z/ω,
a capacitance of said second capacitor being set to 1/(aωZ), and
an inductance of said second coil being set to a(a+1)Z/ω,
where ω represents a frequency of said alternating-current electric power, a represents a ratio of an output voltage from said filter circuit to an input voltage to said filter circuit, and Z represents any design value.
8. The electric power reception device according to claim 7 , wherein
said rectification portion is implemented by a capacitor input type rectification circuit.
9. The electric power reception device according to claim 7 , wherein
said a is set to 4V/(π√(2PkωL)),
where V represents an output voltage from said rectification portion, P represents electric power received by said electric power reception portion, k represents a coefficient of coupling, and L represents an inductance of a coil of each of said electric power reception portion and an electric power transmission portion of said electric power transmission device.
10. The electric power reception device according to claim 7 , wherein
said first coil is implemented by third and fourth coils resulting from division into two and provided in balance in both of said power line pair,
said second coil is implemented by fifth and sixth coils resulting from division into two and provided in balance in both of said power line pair,
an inductance of each of said third and fourth coils is set to (a+1)Z/(2ω), and
an inductance of each of said fifth and sixth coils is set to a(a+1)Z/(2ω).
11. A vehicle comprising the electric power reception device according to claim 7 .