RESONANCE-TYPE NON-CONTACT POWER SUPPLY SYSTEM

• US 20140203658A1
• Filed: 05/11/2012
• Published: 07/24/2014
• Est. Priority Date: 06/17/2011
• Status: Abandoned Application

• Current Assignee: Kabushiki Kaisha Toyota Jidoshokki (Toyota Motor Corporation)
• Original Assignee: Kabushiki Kaisha Toyota Jidoshokki (Toyota Motor Corporation)
• Inventors: Taguchi, Yuichi, Yamaguchi, Atsushi
• Application Number:
  US14/125,786
• Publication Number:
  US 20140203658A1
• Time in Patent Office: Days
• US Class Current: 307/104
• CPC Class Codes: B60L 53/122 Circuits or methods for driving the primary coil, e.g. supplying electric power to the coil
• CPC Class Codes: B60L 53/126 Methods for pairing a vehicle and a charging station, e.g. establishing a one-to-one relation between a wireless power transmitter and a wireless power receiver
• CPC Class Codes: H01M 10/46 Accumulators structurally combined with charging apparatus circuits for charging H02J7/00
• CPC Class Codes: H02J 50/12 of the resonant type
• CPC Class Codes: H02J 50/80 involving the exchange of data, concerning supply or distribution of electric power, between transmitting devices and receiving devices
• CPC Class Codes: H02J 7/00034 Charger exchanging data with an electronic device, i.e. telephone, whose internal battery is under charge
• CPC Class Codes: H02J 7/00712 the cycle being controlled or terminated in response to electric parameters
• CPC Class Codes: Y02E 60/10 Energy storage using batteries
• CPC Class Codes: Y02T 10/70 Energy storage systems for electromobility, e.g. batteries
• CPC Class Codes: Y02T 10/7072 Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
• CPC Class Codes: Y02T 90/12 Electric charging stations
• CPC Class Codes: Y02T 90/14 Plug-in electric vehicles

Abstract

A resonance-type non-contact power supply system is configured such that a power supply section is changeable in output frequency, and has an impedance measuring section that measures the input impedance of a resonant system. The power supply system includes a control section that performs control for transmitting proper power to power receiving equipment after changing the output frequency (f_o) of the power supply section to lie within one of the frequency ranges f₁≦f_o≦f₂, . . . , f_2n-1≦f_o≦f_2n. The frequencies f₁, f₂, . . . , f_2n-1, f_2n (f₁<f₂< . . . <f_2n-1<f_2n) are defined such that, if the input impedances of the resonant system at the time of supply of power of the frequencies f₁, f₂, . . . , f_2n-1, f_2n to the resonant system are represented by Z₁, Z₂, . . . , Z_2n-1, Z_2n, the input impedances satisfy Z₁=Z₂, . . . , Z_2n-1=Z_2n.

Claims

1. A resonance-type non-contact power supply system comprising:

power supply equipment including a power source section and a primary resonance coil configured to be supplied with power from the power source section;

a secondary resonance coil configured to receive power from the primary resonance coil by magnetic field resonance; and

power receiving equipment including a load configured to be supplied with power received at the secondary resonance coil, wherein

at least the primary resonance coil, the secondary resonance coil, and the load constitute a resonant system, and

the power source section is configured to be changeable in output frequency,

the resonance-type non-contact power supply system further comprising;

an impedance measuring section for measuring an input impedance of the resonant system; and

a control section that performs control for transmitting proper power to the power receiving equipment after changing the output frequency f_o of the power source section to lie within one of the frequency ranges f₁≦

f_o≦

f₂, f₃≦

f_o≦

f₄, . . . , f_2n-1≦

f_o≦

f_2n,

the frequencies f₁, f₂, f₃, f₄, . . . , f_2n-1, f_2n (f₁<

f₂<

f₃<

. . . <

f_2n-1<

f_2n) are defined such that, if the input impedances of the resonant system at the time of supply of power of the frequencies f₁, f₂, f₃, f₄, . . . , f_2n-1, f_2n (f₁<

f₂<

f₃<

. . . <

f_2n-1<

f_2n) to the resonant system are represented by Z₁, Z₂, Z₃, . . . , Z_2n-1, Z_2n, the input impedances satisfy Z₁=Z₂, Z₃=Z₄, . . . , Z_2n-1=Z_2n.

2. The resonance-type non-contact power supply system according to claim 1, wherein

at least one of the power supply equipment and the power receiving equipment is provided with an induction coil configured to supply power received from the power source section to the primary resonance coil by electromagnetic induction or with an induction coil configured to draw power received at the secondary resonance coil by electromagnetic induction, and

at least the induction coil, the primary resonance coil, the secondary resonance coil, and the load constitute the resonant system.

3. The resonance-type non-contact power supply system according to claim 1, wherein the control section is configured to perform control in which

the control section determines the frequencies f₁, f₂, f₃, . . . , f_2n-1, f_2n (f₁<

f₂<

f₃<

. . . <

f_2n-1<

f_2n) prior to the proper power transmission from the power supply equipment,

based on the result of the determination, the control section selects one of the frequency ranges f₁≦

f_o≦

f₂, f₃≦

f_o≦

f₄, . . . f_2n-1≦

f_o≦

f_2n for the output frequency f_o of the power source section to lie within and accordingly changes the output frequency of the power source section, and

the control section starts the proper power transmission,

thereafter, based on the result of a measurement by the impedance measuring section, the control section determines whether or not the output frequency f_o deviates from the selected range,

if the frequency deviates, the control section determines frequencies f_1′

, f_2′

, f_3′

, . . . , f_2n-1′

, f_2n′

(f_1′

<

f_2′

<

f_3′

<

. . . <

f_2n-1′

<

f_2n′

),

based on the result of the determination, the control section selects one of the frequency ranges f_1′

≦

f_o≦

f_2′

, f_3′

≦

f_o≦

f_4′

, . . . , f_2n-1′

≦

f_o≦

f_2n′

for the output frequency f_o of the power source section to lie within, accordingly changes the output frequency of the power source section, and then performs the proper power transmission, and

the frequencies f_1′

, f_2′

, f_3′

, . . . , f_2n-1′

, f_2n′

are defined such that, if the input impedances of the resonant system at the time of supply of power of the frequencies f_1′

, f_2′

, f_3′

, . . . , f_2n-1′

, f_2n′

to the resonant system are represented by Z_1′

, Z_2′

, Z_3′

, . . . , Z_2n-1′

, Z_2n′

, the input impedances satisfy Z_1′

=Z_2′

, Z_3′

=Z_4′

, . . . , Z_2n-1′

=Z_2n′

.

4. The resonance-type non-contact power supply system according to claim 1, wherein the power receiving equipment is built in a vehicle and the vehicle includes a rectifier and a battery as the load.