JP7238585B2 - Contactless power receiving device, contactless power supply device, and contactless power supply system - Google Patents

Description

The present disclosure relates to technology for contactlessly supplying power to a vehicle.

Patent Literature 1 discloses an example of a contactless power supply system in which a three-phase power transmission coil is arranged on the ground side and a three-phase power reception coil is arranged on the vehicle side.

WO2010/031595

However, in the contactless power supply system described above, in a plurality of combinations between the three-phase power transmission coil and the three-phase power reception coil, the electrical and magnetic characteristics obtained between the power transmission coil and the power reception coil are inadequate. In the equilibrium state, amplitude fluctuations and phase shifts occur in the three-phase currents flowing through the three-phase power receiving coils, and power fluctuations called pulsation occurring in the DC power received by the vehicle increase. Therefore, there is a problem that power supply efficiency in the contactless power supply system is deteriorated. In particular, power receiving coils mounted on vehicles are required to be miniaturized. For this reason, there is a high possibility that the imbalance in the characteristics of the power received by the power receiving coils of the respective phases will become unignorable.

According to one aspect of the present disclosure, a contactless power receiving device (205, 205B) that receives power that is contactlessly supplied from a contactless power supply device is provided. This contactless power receiving device includes power receiving resonance circuits (210, 210B) having power receiving resonance circuit units (210u, 210v, 210w, 210a, 210b) of multiple phases, and converting AC power received by the power receiving resonance circuits into DC power. and a power receiving circuit (220, 220B) that converts the power into the power and supplies it to the load. The power receiving circuit includes power receiving side filter circuits (224, 224B) having power receiving side filter circuit units (224u, 224v, 224w, 224a, 224b) of a plurality of phases for adjusting AC power input from the power receiving resonant circuit units of respective phases. ), a rectifier circuit (226, 226B) for converting the AC power of each phase input from the power receiving side filter circuit unit of each phase into one DC power, and the DC power input from the rectifier circuit to the load and a power conversion circuit (228) for converting power to be supplied to the . At least two of the power receiving side filter circuit units of the plurality of phases have impedance characteristics different from each other, and the power receiving side filter circuit units of the respective phases are respectively connected to the rectifying power receiving side filter circuit units of the respective phases. The impedance characteristics are set so that the characteristics of the AC power of each phase input to the circuit are balanced with each other .
According to this non-contact power receiving device, it is possible to reduce power fluctuations such as power pulsations that occur in the DC power output from the rectifier circuit. As a result, an increase in power loss caused by power conversion in the power conversion circuit can be reduced. As a result, it is possible to improve power supply efficiency in a contactless power supply system that supplies power from the contactless power supply device to the contactless power receiving device in a contactless manner.

According to another aspect of the present disclosure, a contactless power supply device (100) that supplies power to a contactless power receiving device in a contactless manner is provided. This contactless power supply device includes a power transmission resonance circuit (110, 110E) that transmits AC power to a power reception resonance circuit of the contactless power reception device, and a power supply circuit (130) that converts DC power into AC power. a power transmission circuit (120, 120E) that supplies power to the power transmission resonant circuit; and a plurality of contactless power supply segments (Seg). The power transmission circuit includes inverter circuits (122, 122E) that convert DC power of the power supply circuit into AC power, and power transmission side filter circuits (124, 124E) that adjust the AC power of the inverter circuit and supply it to the power transmission resonance circuit. 124E) and At least two of the plurality of contactless power supply segments have different impedance characteristics of the power transmission side filter circuits, and the power transmission side filter circuits of the contactless power supply segments have power transmission resonance of the respective contactless power supply segments. The circuit has a characteristic impedance set to reduce the difference in characteristics of the AC power supplied to the contactless power receiving device.
According to this non-contact power supply device, it is possible to reduce the difference in the characteristics of the power received by the non-contact power reception device with respect to each non-contact power supply segment. can be done. As a result, it is possible to improve power supply efficiency in a contactless power supply system that supplies power from a contactless power supply device to a contactless power receiving device in a contactless manner.

According to another aspect of the present disclosure, there is provided a contactless power supply system for contactlessly supplying power from the contactless power supply device (100) to the contactless power receiving devices (205, 205B). The contactless power receiving device of this contactless power supply system includes a power receiving resonance circuit (210, 210B), and a power receiving circuit (220, 220B) that converts AC power received by the power receiving resonance circuit into DC power and supplies it to a load. ) and The contactless power supply device includes a power transmission resonance circuit (110, 110E) that transmits AC power to a power reception resonance circuit of the contactless power reception device, and a DC power supply circuit (130) that converts DC power into AC power. a power transmission circuit (120, 120E) that supplies power to the power transmission resonant circuit; and a plurality of contactless power supply segments (Seg). The power transmission circuit includes inverter circuits (122, 122E) that convert DC power of the power supply circuit into AC power, and power transmission side filter circuits (124, 124E) that adjust the AC power of the inverter circuit and supply it to the power transmission resonance circuit. 124E) and At least two of the plurality of contactless power supply segments have different impedance characteristics of the power transmission side filter circuits, and the power transmission side filter circuits of the contactless power supply segments have power transmission resonance of the respective contactless power supply segments. The circuit has impedance characteristics set to reduce differences in characteristics of AC power supplied to the contactless power receiving device.
According to this wireless power supply system, it is possible to reduce the difference in the characteristics of the power received by the wireless power receiving device for each wireless power supply segment, thereby reducing the fluctuation of the power received by the power receiving circuit of the wireless power receiving device. can do. As a result, it is possible to improve power supply efficiency in a contactless power supply system that supplies power from a contactless power supply device to a contactless power receiving device in a contactless manner.

1 is a block diagram showing the overall configuration of a contactless power supply system; FIG. FIG. 2 is a circuit diagram showing a power transmission circuit of a contactless power supply device and a contactless power receiving device; FIG. 2 is an explanatory diagram showing the configuration of a single-phase power transmission coil and a three-phase power reception coil; FIG. 3 is a schematic diagram showing an example of the arrangement of three-phase receiving coils; FIG. 3 is a circuit diagram showing a U-phase equivalent circuit in FIG. 2; 7 is a graph showing an example of change in output power pulsation with respect to Z02 error rate; Graph showing an example of change in DC/DC power loss with respect to Z02 error rate. The circuit diagram which shows the power transmission circuit of the non-contact electric power supply of 2nd Embodiment, and a non-contact power-receiving apparatus. The circuit diagram which shows the power transmission circuit of the non-contact electric power supply of 3rd Embodiment. The circuit diagram which shows the power transmission circuit of the non-contact electric power supply of 4th Embodiment.

A. First embodiment:
As shown in FIG. 1, the contactless power supply system includes a contactless power supply device 100 installed on a road RS and a contactless power receiving device 205 mounted on a vehicle 200 traveling on the road RS. It is a system that can supply power inside. Vehicle 200 is configured as, for example, an electric vehicle or a hybrid vehicle. In FIG. 1, the x-axis direction indicates the traveling direction of the vehicle 200, the y-axis direction indicates the width direction of the vehicle 200, and the z-axis direction indicates the vertically upward direction. The directions of the x, y, and z axes in other drawings to be described later are the same directions as in FIG.

The contactless power supply device 100 includes a plurality of power transmission resonance circuits 110, a plurality of power transmission circuits 120 that supply AC power to the plurality of power transmission resonance circuits 110, a power supply circuit 130 that supplies DC power to the plurality of power transmission circuits 120, and a power receiving coil position detector 140 .

The plurality of power transmission resonance circuits 110 are installed on or in the road surface of the road RS along the traveling direction of the vehicle 200 (also referred to as "extending direction of the road RS"). Each power transmitting resonant circuit 110 includes a power transmitting coil and a resonant capacitor, which will be described later. In the power transmission resonance circuit 110, both the power transmission coil and the resonance capacitor need not be installed along the extending direction of the road RS. good.

Each of the plurality of power transmission circuits 120 is a circuit that converts DC power supplied from the power supply circuit 130 into high-frequency AC power and applies it to the power transmission coil of the power transmission resonance circuit 110 . A specific configuration example of the power transmission circuit 120 will be described later. The power supply circuit 130 is a circuit that supplies DC power to the power transmission circuit 120 . For example, the power supply circuit 130 is configured as an AC/DC converter circuit that rectifies an AC voltage of an external power supply and outputs a DC voltage.

Note that the power transmission resonant circuit 110 and the power transmission circuit 120 that supplies AC power to the power transmission resonant circuit 110 are treated as one segment (also referred to as a “contactless power supply segment”). FIG. 1 shows five segments from the i−2 th segment Segi−2 to the i+2 th segment Segi+2.

Power receiving coil position detection unit 140 detects the position of a power receiving coil installed on the bottom of vehicle 200 of power receiving resonance circuit 210 described later. The power receiving coil position detection unit 140 may, for example, detect the position of the power receiving coil of the power receiving resonance circuit 210 from the magnitude of the transmitted power or the transmitted current in the plurality of power transmission circuits 120, or may detect the position of the power receiving coil of the power receiving resonance circuit 210. A position sensor that detects the position of vehicle 200 may be used to detect the position of the power receiving coil of power receiving resonance circuit 210 . The plurality of power transmission circuits 120 transmit power using one or more segments of the power transmission resonance circuit 110 close to the power reception resonance circuit 210 according to the position of the power reception coil of the power reception resonance circuit 210 detected by the power reception coil position detection unit 140 . to run.

Vehicle 200 includes contactless power receiving device 205 , main battery 230 , motor generator 240 , inverter circuit 250 , DC/DC converter circuit 260 , auxiliary battery 270 , auxiliary device 280 , and control device 290 . I have. The contactless power receiving device 205 has a power receiving resonant circuit 210 and a power receiving circuit 220 .

The power receiving resonance circuit 210 includes a power receiving coil and a resonance capacitor, which will be described later, and is a device that obtains AC power induced in the power receiving coil by an electromagnetic induction phenomenon with the power transmission resonance circuit 110 . The power receiving circuit 220 is a circuit that converts AC power output from the power receiving resonance circuit 210 into DC power. A specific configuration example of the power receiving circuit 220 will be described later. The DC power output from the power receiving circuit 220 can be used to charge the main battery 230 as a load, charge the auxiliary battery 270, drive the motor generator 240, and drive the auxiliary device 280. is also available.

Main battery 230 is a secondary battery that outputs DC power for driving motor generator 240 . Motor generator 240 operates as a three-phase AC motor and generates driving force for running vehicle 200 . Motor generator 240 operates as a generator during deceleration of vehicle 200 and generates three-phase AC power. Inverter circuit 250 converts the DC power of main battery 230 into three-phase AC power to drive motor generator 240 when motor generator 240 operates as a motor. When motor generator 240 operates as a generator, inverter circuit 250 converts the three-phase AC power output from motor generator 240 into DC power and supplies the DC power to main battery 230 .

DC/DC converter circuit 260 converts the DC voltage of main battery 230 into a lower DC voltage and supplies it to auxiliary battery 270 and auxiliary device 280 . Auxiliary battery 270 is a secondary battery that outputs DC power for driving auxiliary device 280 . Auxiliary device 280 is a peripheral device such as an air conditioner or an electric power steering device.

Control device 290 controls each part in vehicle 200 . Control device 290 controls power receiving circuit 220 to receive power when receiving contactless power supply while the vehicle is running.

Power transmission circuit 120 and power transmission resonance circuit 110 of one segment of contactless power supply device 100 and power reception resonance circuit 210 and power reception circuit 220 of contactless power reception device 205 of vehicle 200 are configured, for example, by the circuits shown in FIG. there is FIG. 2 exemplifies a state in which power is transmitted between the i-th segment Segi and the non-contact power receiving device 205 . In FIG. 2, "i" is added to the end of each reference numeral indicating a component of the i-th segment Segi to indicate that it is a component of the i-th segment Segi. The same applies to the power transmission circuit 120 and the power transmission resonance circuit 110 of the other segments, so illustration and description are omitted. In the following description, when there is no particular need to distinguish between segments, the code indicating the number of the segment, such as "i" appended at the end, may be omitted.

The power transmission resonance circuit 110i has a power transmission coil 112i and a resonance capacitor 116i connected in series. The power receiving resonance circuit 210 has U, V, and W three-phase power receiving resonance circuit units 210u, 210v, and 210w. Each power receiving resonance circuit unit 210u, 210v, 210w has power receiving coils 212u, 212v, 212w and resonance capacitors 216u, 216v, 216w connected in series. The power receiving resonant circuit units 210u, 210v, and 210w of the power transmitting resonant circuit 110i and the power receiving resonant circuit 210 employ a primary-series-secondary-series capacitor system (also called "SS system") resonance system. In addition, a non-contact power supply system of single phase on the power transmission side and three phases on the power reception side is applied, in which the power transmission side is configured with a single-phase power transmission coil 112i, and the power reception side is configured with three-phase power reception coils 212 of power reception coils 212u, 212v, and 212w. It is The inductance of the power transmission coil 112i is represented by Lr1i, and the capacitance of the resonance capacitor 116i is represented by Cr1i. The inductances of the receiving coils 212u, 212v, 212w of each phase are represented by Lr2u, Lr2v, Lr2w, and the capacitances of the resonance capacitors 216u, 216v, 216w of each phase are represented by Cr2u, Cr2v, Cr2w.

The power transmission circuit 120i includes an inverter circuit 122i that converts DC power from the power supply circuit 130 into AC power, and a T-LCL immittance conversion circuit 124i having two inductors 124Li and one capacitor 124Ci. The inductance of the inductor 124Li is represented by L1i, and the capacitance of the capacitor 124Ci is represented by C1i. The immittance conversion circuit 124i receives an input according to the immittance characteristic that converts the impedance seen from the input side into the admittance on the output side at the resonance angular frequency set to be equal to the fundamental angular frequency ω0 of the AC power to be transmitted. It has the function of adjusting the AC power. Also, the immittance conversion circuit 124i functions as a low-pass filter circuit at frequencies other than the resonance frequency.

The power receiving circuit 220 includes an immittance conversion circuit 224, a rectification circuit 226 that converts the AC power from the immittance conversion circuit 224 into DC power, and a power conversion circuit that converts DC voltage power suitable for charging the main battery 230. and a DC/DC converter circuit 228 .

The immittance conversion circuit 224 has three-phase immittance conversion circuit units 224u, 224v, and 224w corresponding to the three-phase power reception resonance circuit units 210u, 210v, and 210w. Each immittance conversion circuit unit 224u, 224v, 224w is a T-LCL immittance conversion circuit, and has two inductors 224Lu, 224Lv, 224Lw and one capacitor 224Cu, 224Cv, 224Cw. The inductances of the inductors 224Lu, 224Lv and 224Lw are represented by L2u, L2v and L2w, and the capacitances of the capacitors 224Cu, 224Cv and 224Cw are represented by C2u, C2v and C2w. Each immittance conversion circuit unit 224u, 224v, 224w has the same function as the immittance conversion circuit 124i of the power transmission circuit 120i.

The three-phase power receiving resonance circuit units 210u, 210v, and 210w are star-connected, and their outputs are connected to the inputs of the corresponding phase immittance conversion circuit units 224u, 224v, and 224w. The three-phase immittance conversion circuit units 224u, 224v, and 224w are also star-connected, and their respective outputs are connected to the rectifier circuit 226. FIG. Note that the three-phase power receiving resonance circuit units 210u, 210v, and 210w and the immittance conversion circuit units 224u, 224v, and 224w may be connected in a Δ connection.

As shown in FIG. 3 , the power transmission resonance circuit 110 of each segment has a power transmission coil 112 and a magnetic yoke 114 . FIG. 3 shows the power transmission coils 112i-1 to 112i+1 and the magnetic yokes 114i-1 to 114i+1 of the i−1th to i+1th segments.

The power receiving resonance circuit 210 has a power receiving coil 212 and a magnetic yoke 214 . The power receiving coil 212 is a three-phase coil including a power receiving coil 212u of a U-phase power receiving resonance circuit section 210u, a power receiving coil 212u of a V-phase power receiving resonance circuit section 210v, and a power receiving coil 212w of a W-phase power receiving resonance circuit section 210w. is configured as As shown in FIG. 4, the three power receiving coils 212u, 212v, and 212w overlap in the −z direction in the order of the V-phase power receiving coil 212v, the U-phase power receiving coil 212u, and the W-phase power receiving coil 212w. are arranged so that they are shifted in order. Note that the power receiving resonance circuit 210 in FIG. 3 schematically shows the 3-3 cross section in FIG.

Each of the coils 112, 212u, 212v, and 212w is normally configured as a concentrated winding coil having two or more windings, but is simplified in FIGS. A black circle “·” and a cross mark “x” in circles indicating the coil wire of each coil indicate that the current direction is the opposite direction.

The magnetic yokes 114 , 214 are so-called back yokes and are used to increase the magnetic flux density around the coils 112 , 212 . The magnetic yoke 114 of the power transmission resonance circuit 110 is arranged on the back side of the power transmission coil 112 . “Back side of power transmitting coil 112 ” means the side opposite to the gap between power transmitting coil 112 and power receiving coil 212 . Similarly, the magnetic yoke 214 of the power receiving resonance circuit 210 is arranged behind the power receiving coil 212 . Magnetic cores may be provided in the power transmitting coil 112 and the power receiving coil 212 separately from the magnetic yokes 114 and 214 . Magnetic shield plates made of non-magnetic metal may be provided on the back sides of the magnetic yokes 114 and 214, respectively.

In FIG. 3, three-phase received power waveforms Psu, Psv, and Psw by the three receiving coils 212u, 212v, and 212w of the receiving coil 212 are depicted. The frequency of the AC power applied to the power transmission coil 112 is set to a sufficiently high frequency to the extent that the power reception coil 212 can be regarded as almost stopped even when the vehicle 200 is running, regarding the power transmission from the power transmission coil 112 to the power reception coil 212. be done. For example, when the moving frequency of the power receiving coil 212 in the non-contact power supply while driving is in the range of several tens of Hz to several hundred Hz, the frequency of the AC voltage applied to the power transmission coil 112 is in the range of several tens of kHz to several hundred kHz. set to the value In this way, if the frequency of the AC voltage applied to power transmission coil 112 is set to a value sufficiently higher than moving frequency f212 of power reception coil 212, power transmission from power transmission coil 112 to power reception coil 212 will occur when vehicle 200 runs. Among them, it can be considered that the receiving coil 212 is almost stopped.

Here, as shown in FIG. 4, when the three power receiving coils 212u, 212v, and 212w are misaligned or overlapped, depending on the misalignment or overlapping (hereinafter also referred to as "arrangement structure"), Since the coils have different electrical and magnetic characteristics, the received three-phase AC power is unbalanced. In particular, since the power receiving coil 212 mounted on the vehicle is required to be miniaturized, the influence of the arrangement structure becomes large, and there is a high possibility that unignorable imbalance will occur in the received AC power. In the arrangement relationship of the three power receiving coils 212u, 212v, and 212w shown in FIG. received power Psv, Psw. In such an unbalanced three-phase received power, the DC power converted by the rectifier circuit 226 undergoes a power fluctuation called pulsation. This power fluctuation is absorbed by the control of the output voltage by the DC/DC converter circuit 228 . However, in the DC/DC converter circuit 228, because of this absorption control, the operating range is widened, leading to an increase in loss. As a result, the power receiving efficiency of the non-contact power receiving device 205 deteriorates. In addition, power supply efficiency in the contactless power supply system that supplies power from the contactless power supply device 100 to the contactless power receiving device 205 is degraded.

Therefore, the contactless power receiving device 205 of the present embodiment reduces fluctuations in received power by adopting the configuration described below.

In the following description, the inductors (also referred to as "coils") and capacitors included in immittance conversion circuits 124i and 224, and the coils and capacitors included in power transmission resonance circuit 110i and power reception resonance circuit 210 are referred to as A symbol indicating each value may be used as a code. For example, the inductor 124Li of the immittance conversion circuit 124i may be referred to as "inductor L1i" using its inductance L1i, and the capacitor 124Ci may be referred to as "capacitor C1i" using its capacitance C1i. The same applies to other embodiments described below.

Among the configurations from the power supply circuit 130 on the power supply side (also referred to as the "transmission side") to the power receiving circuit 220 on the power receiving side shown in FIG. 2, the configuration related to the U phase is represented by the equivalent circuit shown in FIG. Power supply circuit 130 and inverter circuit 122 are replaced with AC power supply SAC. The power transmitting/receiving circuit composed of the power transmitting resonant circuit 110i and the power receiving resonant circuit section 210u of the power receiving resonant circuit 210 is replaced with a T-type equivalent circuit TECu using the mutual inductance Lmiu between the power transmitting coil Lr1i and the power receiving coil Lr2u. R1i and R2u are winding resistances. Rectifier circuit 226 and DC/DC converter circuit 228 are replaced with impedance characteristic Z4, which will be described later.

In the following description, Z1u is the impedance characteristic showing the transfer characteristic of the input side of the immittance conversion circuit 124i viewed from the terminal pair P1u-P1u* on the output side of the inverter circuit 122i (see FIG. 2). The impedance characteristic Z1u is represented by V1u/I1u. V1u is the voltage across the terminal pair P1u-P1u*, and I1u is the current flowing through the immittance conversion circuit 124i. Let Z01i be the characteristic impedance of the immittance conversion circuit 124 . Let Z2u be the impedance characteristic of the output side terminal pair P2u-P2u* of the immittance conversion circuit 124 as seen from the latter stage. The impedance characteristic Z2u is represented by V2u/I2u. V2u is the voltage across the terminal pair P2u-P2u*, and I2u is the current flowing to the rear stage. Let Z3 be the impedance characteristic when the input side of the immittance conversion circuit unit 224u on the power receiving side is viewed from the terminal pair P3u-P3u* on the input side of the immittance conversion circuit unit 224u on the power receiving side. Impedance characteristic Z3 is represented by V3/I3. V3 is the voltage between the terminal pair P3-P3*, and I3 is the current flowing through the immittance conversion circuit section 224u. Let Z03u be the characteristic impedance of the immittance conversion circuit unit 224u. Z4u is the impedance characteristic of the rear stage side from the terminal pair P4u-P4u* on the output side of the immittance conversion circuit section 224u. The impedance characteristic Z4u is represented by V4u/I4u. V4u is the voltage across the terminal pair P4u-P4u*, and I4u is the current flowing to the rear stage. This impedance characteristic Z4u is the impedance characteristic Z4 that changes according to the state of main battery 230 . The impedance characteristic Z4 is maximized when the main battery 230 is fully charged, and the impedance characteristic Z4 is minimized when the voltage of the main battery 230 is the lowest allowable operating range. , when charging is carried out with the highest current allowed.

Although illustration and description are omitted, equivalent circuits for the V-phase and W-phase are also represented by equivalent circuits similar to those for the U-phase. In the V-phase equivalent circuit, the suffix “u” of the U-phase equivalent circuit can be replaced with “v”, and in the W-phase equivalent circuit, the suffix “u” of the U-phase equivalent circuit can be replaced with “w”. Replace it.

The impedance characteristic Z1u, which is the transfer characteristic of the U-phase equivalent circuit shown in FIG. 5, is expressed by the following equation (1u).
Z1u=Z01i ² /Z2u
=(Z01i ² ·Z03u ² )/(Z02iu ² ·Z4u) (1u)
Z01i is the characteristic impedance of the immittance conversion circuit 124i and is represented by the following equation (2u). Z02iu is the characteristic impedance of the U-phase transmission/reception circuit TECu, and is expressed by the following equation (3u). Z03u is the characteristic impedance of the U-phase immittance conversion circuit section 224u, and is expressed by the following equation (4u). Z4u is the impedance characteristic Z4.
Z01i=ω0·L1i=1/(ω0·C1i) (2u)
Z02iu=ω0·Lmiu (3u)
Z03u=ω0·L2u=1/(ω0·C2u) (4u)
ω0 is the fundamental angular frequency of the transmitted AC power. L1i and C1i are the inductance and capacitance of the immittance conversion circuit 124i on the transmission side. Lmiu is the mutual inductance of the U-phase transmission/reception circuit TECu. L2u and C2u are the inductance and capacitance of the U-phase immittance conversion circuit section 224u on the power receiving side.

Similarly, the V-phase impedance characteristic Z1v is expressed by the following equation (1v), and the W-phase impedance characteristic Z1w is expressed by the following equation (1w).
Z1v= ^Z01i2 /Z2v
=( ^Z01i2 - ^Z03v2 )/( ^Z02iv2 -Z4v) (1v)
Z1w= ^Z01i2 /Z2w
= (Z01i ² · Z03w ² )/(Z02iw ² · Z4w) (1w)
Z02iv is the characteristic impedance of the V-phase transmission/reception circuit TECu, and is expressed by the following equation (3v). Z03v is the characteristic impedance of the V-phase immittance conversion circuit section 224v, and is expressed by the following equation (4v). Z02iw is the characteristic impedance of the W-phase transmission/reception circuit TECw, and is expressed by the following equation (3w). Z03w is the characteristic impedance of the W-phase immittance conversion circuit section 224w, and is expressed by the following equation (4w). Z4v and Z4w are impedance characteristics Z4.
Z02iv=ω0·Lmiv (3v)
Z03v=ω0·L2v=1/(ω0·C2v) (4v)
Z02iw=ω0·Lmiw (3w)
Z03w=ω0·L2w=1/(ω0·C2w) (4w)
Lmiv is the mutual inductance of the V-phase transmission/reception circuit TECv. L2v and C2v are the inductance and capacitance of the V-phase immittance conversion circuit section 224v on the power receiving side. Lmiw is the mutual inductance of the W-phase transmission/reception circuit TECw. L2w and C2w are the inductance and capacitance of the W-phase immittance conversion circuit section 224w on the power receiving side.

If the impedance characteristics Z1u, Z1v, and Z1w represented by the above equations (1u), (1v), and (1w) are the same, that is, if Z1u=Z1v=Z1w, the characteristics of the received power of each phase are balanced and unbalanced. Theoretically, it can be said that power fluctuation due to equilibrium does not occur. Focusing on this point, the parameters Z01i, Z4u, Z4v, and Z4w that are common in the above equations (1u), (1v), and (1w) can be omitted, and the impedance characteristics Z1u, Z1v, and Z1w can be obtained by the following equations ( 5u), (5v), and (5w) can be replaced by impedance characteristics Zu, Zv, and Zw. Therefore, if each constituent element is set so that the difference between the impedance characteristics Zu, Zv, and Zw of each phase becomes small, that is, Zu≈Zv≈Zw, the imbalance occurs due to the unbalanced received power of each phase. It is considered possible to reduce power fluctuations.
Zu=Z03u ² /Z02iu ² (5u)
Zv= ^Z03v2 / ^Z02iv2 (5v)
Zw= ^Z03w2 / ^Z02iw2 (5w)

Here, the characteristic impedances Z02iu, Z02iv, and Z02iw of the above equations (5u), (5v), and (5w) are expressed by the above equations (3u), (3v), and (3w), respectively. They are represented by Lmiu, Lmiv, and Lmiw, and change according to the imbalance caused by the arrangement structure of the passive coils, etc., as described above. Therefore, the fluctuations of the characteristic impedances Z02iu, Z02iv, and Z02iw that occur in response to such unbalance are expressed by Zu≈Zv≈Zw. can be reduced by setting

The inductance values of the inductors L2u, L2v, and L2w and the capacitance values of the capacitors C2u, C2v, and C2w forming the immittance conversion circuit units 224u, 224v, and 224w of the respective phases are given by the above equations (4u), (4v), (4w).

Here, under the condition of Zu>Zv=Zw, with the characteristic impedance Z02iu of the U phase as a reference, the parameters of the characteristic impedances Z02iv and Z02iw of the V and W phases are changed to change the pulsation of the output power and the DC/DC converter circuit 228. was simulated for the power loss of Specifically, by adjusting the characteristic impedances Z03u, Z03v, and Z03w of the immittance conversion circuit units 224u, 224v, and 224w for each phase, the error compensation of the characteristic impedances Z02iu, Z02iv, and Z02iw is performed. A simulation was performed for the combinations that were not performed. Note that error compensation for the characteristic impedances Z02iu, Z02iv, and Z02iw is hereinafter simply referred to as "error compensation for the characteristic impedance Z02".

FIG. 6 shows an example of simulation results of changes in output power pulsation [W] with respect to the Z02 error rate, specifically, the ratio of Z02iv, Z02iw to Z01iu. FIG. 7 shows an example of simulation results of changes in the power loss [W] of the DC/DC converter circuit 228 with respect to the Z02 error rate similar to FIG.

As shown in FIG. 6, irrespective of the presence or absence of error compensation for the characteristic impedance Z02, the pulsation of the output power is There is an increasing trend. However, it was confirmed that output power pulsation can be reduced by performing error compensation for the characteristic impedance Z02. Also, the pulsation of the output power expands the control operation range of the DC/DC converter circuit 228 . Therefore, as shown in FIG. 7, the power loss of the DC/DC converter circuit 228 also tends to increase as the Z02 error rate decreases, regardless of the presence or absence of error compensation for the characteristic impedance Z02. This increase in power loss generally has the characteristic of increasing exponentially with output power. However, it was confirmed that the amount of increase in power loss can be reduced by performing compensation.

Further, it was confirmed that if the Z02 error rate is 0.7 or more, the increase in power loss can be made equal to or less than the allowable increase rate Rpls. Note that the permissible increase rate Rpls indicates the permissible rate of increase with respect to the power loss when the Z02 error rate is 1, that is, when there is no error. This allowable increase rate Rpls is predetermined, and in this example, Rpls=20%. A Z02 error rate of 0.7 or more means that the errors of the characteristic impedances Z02iu, Z02iv, and Z02iw of each phase are within ±30%. That is, it can be said that it is possible to reduce the increase in power loss to the allowable increase rate Rpls or less if the error of the characteristic impedances Z02iu, Z02iv, and Z02iw of each phase is within ±30%.

Furthermore, it was confirmed that if the Z02 error rate is 0.9 or more, the Z02 error rate is 1, that is, it can be treated as equivalent to the power loss when there is no error. A Z02 error rate of 0.9 or more means that the errors of the characteristic impedances Z02iu, Z02iv, and Z02iw of each phase are within ±10%. That is, it can be said that if the error of the characteristic impedances Z02iu, Z02iv, and Z02iw of each phase is within ±10%, it can be treated as equivalent to the power loss when there is no error.

As described above, in the non-contact power receiving device 205 of the non-contact power supply system of the first embodiment, the three-phase power receiving coils 212u, 212v, and 212w are configured to reduce the unbalance of the three-phase power received by the power receiving coils 212u, 212v, and 212w. characteristic impedances as impedance characteristics of the immittance conversion circuit units 224u, 224v, and 224w are respectively set. Specifically, the immittance conversion circuit unit 224u of each phase is set so that the difference between the impedance characteristics Zu, Zv, and Zw of the three phases viewed from the inverter circuit 122 of the power transmission circuit 120 of the contactless power supply device 100 is reduced. , 224v and 224w are set as characteristic impedances. As a result, it is possible to reduce the power pulsation that occurs in the DC power output from the rectifier circuit 226, that is, the power fluctuation. Also, in the DC/DC converter circuit 228, an increase in power loss caused by control for absorbing fluctuations in the DC power output from the rectifier circuit 226 can be reduced. As a result, it is possible to improve power supply efficiency in a contactless power supply system that supplies power from the contactless power supply device 100 to the contactless power receiving device 205 in a contactless manner.

B. Second embodiment:
The non-contact power receiving device 205 of the first embodiment has been described as an example of a configuration including three-phase power receiving coils 212u, 212v, and 212w as shown in FIG. The contactless power receiving device 205B may be configured to include power receiving coils 212a and 212b. The contactless power supply device of the second embodiment is the same as the contactless power supply device 100 of the first embodiment.

The contactless power receiving device 205B includes a power receiving resonance circuit 210B having two phases of A and B power receiving resonance circuit units 210a and 210b. In addition, the non-contact power receiving device 205B has an immittance conversion circuit 224B having two-phase immittance conversion circuit units 224a and 224b corresponding to the two-phase power receiving resonant circuit units 210a and 210b, and rectifier circuit units 226a and 226b. A power receiving circuit 220B having a rectifying circuit 226B and a DC/DC converter circuit 228 is provided.

The two-phase power receiving resonance circuit units 210a and 210b have the same configuration as the three-phase power receiving resonance circuit units 210u, 210v and 210w (see FIG. 3), and include power receiving coils 212a and 212b and a resonance capacitor 216a connected in series. , 216b. The inductances of the power receiving coils 212a and 212b are represented by Lr2a and Lr2b. The capacitances of resonant capacitors 216a and 216b are represented by Cr2a and Cr2b. The two-phase immittance conversion circuit units 224a and 224b are the same as the three-phase immittance conversion circuit units 224u, 224v and 224w (see FIG. 3), and have two inductors 224La and 224Lb and one capacitor 224Ca and 224Cb. ing. Inductances of inductors 224La and 224Lb are represented by L2a and L2b, and capacitances of capacitors 224Ca and 224Cb are represented by C2a and C2b.

The A-phase rectifying circuit unit 226a converts the AC power output from the A-phase immittance conversion circuit unit 224a into DC power, and the B-phase rectifying circuit unit 226b converts the AC power output from the B-phase immittance conversion circuit unit 224b. Converts electrical power to DC power.

Even in the case of a configuration having two-phase power receiving coils 212a and 212b, power pulsation occurs in the DC power output from rectifier circuit 226B due to imbalance in the two-phase AC power to be received, and power pulsation occurs in DC/DC converter circuit 228. Increased power loss occurs. Therefore, in the second embodiment, as in the first embodiment, the two-phase immittance conversion circuit units 224a and 224b are configured to reduce the imbalance of the two-phase received power by the two-phase receiving coils 212a and 212b. characteristic impedances Z03a and Z03b of are respectively set. Specifically, the characteristic impedances Z03a and Z03b of the two-phase immittance conversion circuit units 224a and 224b can be set as follows.

In the circuit shown in FIG. 8, the impedance characteristics Z1a and Z1b indicating the transfer characteristics of the A and B phases on the subsequent stage side from the inverter circuit 122i are expressed by the following equations (6a) and (6b).
Z1a=( ^Z01i2 - ^Z03a2 )/( ^Z02ia2 -Z4a) (6a)
Z1b=( ^Z01i2 - ^Z03b2 )/( ^Z02ib2 -Z4b) (6b)
Z01i is the characteristic impedance of the immittance conversion circuit 124i and is represented by the following equation (7). Z02ia is the characteristic impedance of the A-phase power transmission/reception circuit, and is expressed by the following equation (8a). Z02ib is the characteristic impedance of the B-phase power transmission/reception circuit, and is represented by the following equation (8b). Z03a is the characteristic impedance of the A-phase immittance conversion circuit section 224a, which is expressed by the following equation (9a). Z03b is the characteristic impedance of the B-phase immittance conversion circuit section 224b, and is expressed by the following equation (9b). Z4a and Z4b are impedance characteristics when the rear stage side is viewed from rectifier circuit units 226a and 226b, and are impedance characteristics Z4 that change according to the state of main battery 230. FIG.
Z01i=ω0·L1i=1/(ω0·C1i) (7)
Z02ia=ω0·Lmia (8a)
Z02ib=ω0·Lmib (8b)
Z03a=ω0·L2a=1/(ω0·C2a) (9a)
Z03b=ω0·L2b=1/(ω0·C2b) (9b)
ω0 is the fundamental angular frequency of the transmitted AC power. L1i and C1i are the inductance and capacitance of the immittance conversion circuit 124i on the transmission side. Lmia is the mutual inductance of the A-phase power transmission/reception circuit. Lmib is the mutual inductance of the B-phase power transmission/reception circuit. L2a and C2a are the inductance and capacitance of the A-phase immittance conversion circuit section 224a on the power receiving side. L2b and C2b are the inductance and capacitance of the B-phase immittance conversion circuit section 224b on the power receiving side.

Incidentally, as described in the first embodiment, the parameters Z01i, Z4a, and Z4b common to the above expressions (6a) and (6b) can be omitted, and the impedance characteristics Z1a and Z1b are respectively expressed by the following expressions (10a) , (10b) can be replaced with impedance characteristics Za and Zb. Therefore, the characteristic impedances Z03a and Z03b of the two-phase immittance conversion circuits 224a and 224b should be set so that the difference between the two-phase characteristic impedances Za and Zb is small, that is, Za≈Zb.
Za=Z03a ² /Z02ia ² (10a)
Zb=Z03a ² /Z02ib ² (10b)

Note that the characteristic impedances Z02ia and Z02ib in the above expressions (10a) and (10b) are the mutual inductances Lmia and Lmib of the power transmission coil 112i and the power reception coils 212a and 212b, respectively, as represented by the above expressions (8a) and (8b). and varies according to the imbalance caused by the arrangement of the passive coils, etc., as described above.

The inductance values of the inductors L2a and L2b and the capacitance values of the capacitors C2a and C2b that constitute the immittance conversion circuit units 224a and 224b for each phase can be obtained from the above equations (9a) and (9b).

As described above, in the second embodiment, similarly to the first embodiment, it is possible to reduce power pulsation generated in the DC power output from the rectifier circuit 226B, that is, power fluctuation. Also, in the DC/DC converter circuit 228, it is possible to reduce an increase in power loss caused by control for absorbing fluctuations in the DC power output from the rectifier circuit 226B. As a result, it is possible to improve power supply efficiency in a contactless power supply system that supplies power from the contactless power supply device 100 to the contactless power receiving device 205B in a contactless manner.

Also in the second embodiment, as in the first embodiment, if the error of the characteristic impedance Z02 of each phase is within ±30%, the increase in power loss can be kept below the allowable increase rate Rpls. is. Also, if the error of the characteristic impedance Z02 of each phase is within ±10%, it can be treated as equivalent to the power loss when there is no error.

C. Third embodiment:
In the first embodiment, in the non-contact power receiving device 205 (see FIG. 2) including three-phase power receiving coils 212u, 212v, and 212w, power pulsation caused by unbalanced power received by the three-phase power receiving coils is reduced, and A configuration has been described that enables a reduction in the increase in power loss in the DC/DC converter circuit 228 . Further, in the second embodiment, in the non-contact power receiving device 205B (see FIG. 8) including two-phase power receiving coils 212a and 212b, power pulsation caused by unbalanced power received by the two-phase power receiving coils is reduced, and A configuration has been described that enables a reduction in the increase in power loss in the DC/DC converter circuit 228 . The non-contact power receiving device is not limited to the non-contact power receiving devices 205 and 205B having two-phase or three-phase power receiving coils. It may be a non-contact power receiving device that includes a multi-phase power receiving coil of four or more phases. Similarly, in such a contactless power receiving device, the difference between the impedance characteristics indicating the transfer characteristics of each phase as seen from the inverter circuit of the power transmission circuit of the contactless power feeding device is reduced and equalized. It is sufficient to set the characteristic impedance of the immittance conversion circuit section of each phase of the power receiving device. By doing so, it is possible to reduce the unbalance of the AC power output from the immittance conversion circuit units of the respective phases, and reduce the power pulsation generated in the DC power output from the rectifier circuit. Also, in the DC/DC converter circuit, it is possible to reduce an increase in power loss caused by control for absorbing fluctuations in the DC power output from the rectifier circuit. As a result, it is possible to improve power supply efficiency in a contactless power supply system that supplies power from the contactless power supply device to the contactless power receiving device in a contactless manner.

Also in the third embodiment, as in the first embodiment, if the error of the characteristic impedance Z02 of each phase is within ±30%, the increase in power loss can be kept below the allowable increase rate Rpls. is. Also, if the error of the characteristic impedance Z02 of each phase is within ±10%, it can be treated as equivalent to the power loss when there is no error.

D. Fourth embodiment:
In the first to third embodiments, each segment Segn (n is the segment number, for example, 1, . . . i, . . . ) has been described on the premise that the impedance characteristics Z1n (Z1n indicates Z11, . . . Z1i, . Specifically, the i-th segment Segi and the non-contact power receiving devices 205 and 205B have been described.

Here, FIG. 9 is a circuit diagram in consideration of wiring for the circuit from the terminal pair P1i-P1i* corresponding to the output end of the inverter circuit 122i of the i-th segment Segi (see FIG. 2) to the power transmitting resonant circuit 110i. showing. The immittance conversion circuit 124i is a T-LCL type circuit and is composed of two inductances L1i and L11i and one capacitor C1i. Note that the two inductances L1i and L11i are normally set to the same inductance value as shown in FIG. Different symbols are used for clarity. The inverter circuit 122i and the immittance conversion circuit 124i, and the immittance conversion circuit 124i and the power transmission resonance circuit 110i are actually connected by wiring that connects them. These wirings have inductance components Lwp1i and Lwp2i and resistance components Rwp1i and Rwp2i. In addition, the wiring between the resonance capacitor Cr1i and the power transmission coil Lr1i connected in series in the power transmission resonance circuit 110i and the winding of the power transmission coil Lr1i have a resistance component R2i.

Impedance characteristic Z1i indicating the transfer characteristic of the subsequent stage from the terminal pair P1i-P1i* when the inductance component and resistance component of the wiring etc. are taken into consideration is expressed by the following equation (11).
Z1i=( ^Rwp1i2 +Rwp1i(Rwp2i+R2i)+ ^Z01i2 )/(Rwp1i+Rwp2i+R2i) (11)
Z01i is the characteristic impedance of the immittance conversion circuit 124i of the i-th segment Segi, and is expressed by the following equation (12).
Z01i=ω0(L1i+Lwp1i)=ω0(L11i+Lwp2i)=1/(ω0·C1i) (12)

Although illustration is omitted, the same applies to other segments.

When the inductance component and resistance component of wiring of each segment Segn are the same or small, the impedance characteristics Z1n of each segment Segn are the same or may be treated as the same.

However, each segment Segn arranged on the road RS (see FIG. 1) tends to increase the size of the power transmission circuit 120n in order to increase the power transmission capacity of each. When the size of the power transmission circuit 120n of each segment Segn increases, the inductance component and resistance component of the wiring increases depending on the length and thickness of the wiring, and the inductance component and resistance component vary between segments. is likely to be too large to ignore. Variations in the inductance component and the resistance component among the segments cause variations in the impedance characteristic Z1n of each segment Segn. Even if the imbalance due to the power receiving coil of the non-contact power receiving device is suppressed as described in the first to third embodiments, the variation in the impedance characteristic Z1n of each segment Segn is This will lead to fluctuations in received power similar to those in the unbalanced case.

Therefore, it is preferable to set the characteristic impedance Z01n of the immittance conversion circuit 124n of each segment Segn so that the difference between the impedance characteristics Z1n of each segment Segn becomes small and equal. By doing so, it is possible to reduce fluctuations in received power due to differences in the segments to which power is transmitted. As a result, it is possible to reduce power pulsation generated in the DC power output from the rectifier circuit of the non-contact power receiving device. Also, in the DC/DC converter circuit, it is possible to reduce an increase in power loss caused by control for absorbing fluctuations in the DC power output from the rectifier circuit. As a result, it is possible to improve power supply efficiency in the contactless power supply system.

The conditions for the error in the characteristic impedance Z02 of each phase described in the first to third embodiments are similarly applicable to the error in the impedance characteristic Z1n of each segment in the fourth embodiment. That is, if the error of the impedance characteristic Z1n of each segment is within ±30%, the increase in power loss can be kept below the allowable increase rate Rpls. Also, if the error of the impedance characteristic Z1n of each segment is within ±10%, it can be treated as equivalent to the power loss when there is no error.

E. Fifth embodiment:
In the fourth embodiment, as in the first embodiment (see FIG. 2), each segment Segn has a single-phase power transmission coil. The configuration for setting the characteristic impedance Z01n of each immittance conversion circuit 124n has been described. On the other hand, a configuration in which each segment Segn has a power transmission coil of multiple phases is also conceivable. For example, FIG. 10 shows an example of the circuit configuration of the i-th segment Segi having U, V, and W three-phase power transmission coils 112ui, 112vi, and 112wi. The segment Segi includes a power transmission resonance circuit 110Ei having three-phase power transmission resonance circuit units 110ui, 110vi, and 110wi, an immittance conversion circuit 124Ei having three-phase immittance conversion circuit units 124ui, 124vi, and 124wi, and three-phase AC power. and a rectifier circuit 122Ei for outputting.

The power transmission resonance circuit units 110ui, 110vi, 110wi of each phase have power transmission coils 112ui, 112vi, 112wi and resonance capacitors 116ui, 116vi, 116wi connected in series. The inductances of the power transmission coils 112ui, 112vi and 112wi are represented by Lr1ui, Lr1vi and Lr1wi, and the capacitances of the resonance capacitors 116ui, 116vi and 116wi are represented by Cr1ui, Cr1vi and Cr1wi.

Each phase immittance conversion circuit unit 124ui, 124wi, 124vi has two inductors 124Lui, 124Lvi, 124Lwi and one capacitor 124Cui, 124Cvi, 124Cwi. Inductances of inductors 124Lui, 124Lvi, 124Lwi are represented by L1ui, L1vi, L1wi, and capacitances of capacitors 124Cui, 124Cvi, 124Cwi are represented by C1ui, C1vi, C1wi.

In the circuit diagram shown in FIG. 10, the inductance component and resistance component of the wiring are omitted. Actually, the wiring of each phase has the same inductance component and resistance component as in FIG. do.

Even in the case of the configuration including the power transmission coils of multiple phases in this way, as with each segment in the fourth embodiment, for example, deviations occur in the impedance characteristics Z1ui, Z1vi, and Z1vw of each phase of the i-th segment Segi. It is highly probable that this will also lead to fluctuations in the received power in the same manner as a receive coil imbalance.

Therefore, the difference between the impedance characteristics Z1un, Z1vn, and Z1wn of each phase of each segment Segn becomes small, and the difference between the characteristics of the AC power supplied to the contactless power receiving device by the power transmission resonance circuit units 110un, 110vn, and 110wn of each phase becomes small. It is preferable to set the characteristic impedances Z01un, Z01vn, Z01wn of the immittance conversion circuit units 124un, 124vn, 124wn of each phase of each segment Segn so that By doing so, it is possible to reduce fluctuations in the received power due to differences in the segments and phases in which power is transmitted. As a result, it is possible to reduce power pulsation generated in the DC power output from the rectifier circuit of the non-contact power receiving device. Also, in the DC/DC converter circuit, it is possible to reduce an increase in power loss that occurs due to absorption of voltage fluctuations on the input side. As a result, it is possible to improve power supply efficiency in the contactless power supply system.

The error conditions of the characteristic impedance Z02 of each phase described in the first to third embodiments can be similarly applied to the errors of the impedance characteristics Z1un, Z1vn, and Z1wn of each phase of each segment in the fifth embodiment. is. That is, if the errors in the impedance characteristics Z1un, Z1vn, and Z1wn of each phase of each segment are within ±30%, the increase in power loss can be kept below the allowable increase rate Rpls. Also, if the error of the impedance characteristics Z1un, Z1vn, and Z1wn of each phase of each segment is within ±10%, it can be treated as equivalent to the power loss when there is no error.

Also, in the above description, the case of a three-phase power transmission coil has been described as an example, but the present invention is not limited to this, and can be similarly applied to a configuration including two-phase or four-phase or more power transmission coils.

F. Other embodiments:
(1) In the above-described first to third embodiments, the configuration for reducing the imbalance of the power received by the multi-phase power receiving coils of the non-contact power receiving device that constitutes the non-contact power supply system has been described. Further, in the fourth and fifth embodiments, fluctuations in received power generated in the contactless power receiving device due to deviations in impedance characteristics as transfer characteristics between a plurality of segments of the contactless power feeding device constituting the contactless power feeding system has been described. Furthermore, in the fifth embodiment, a configuration in which multiple-phase power transmission coils are provided in each segment to reduce fluctuations in received power generated in the contactless power receiving device due to differences in impedance characteristics of the transfer characteristics of the respective phases will be described. bottom. The contactless power receiving device of the first to third embodiments and the contactless power feeding device of the fourth to fifth embodiments may be combined and applied as a contactless power supply system. As a non-contact power receiving device to be combined with the non-contact power feeding device of the fourth and fifth embodiments, not only the non-contact power receiving device of the first to third embodiments but also a non-contact power receiving device having a single-phase power receiving coil may be

(2) In the above-described first to third embodiments, the T-LCL type immittance conversion circuit is used as the filter circuit section of each phase constituting the filter circuit of the non-contact power receiving device. However, it is not limited to this. For example, a T-CLC type immittance conversion circuit, other low-pass filter circuit, or band-pass filter circuit may be used as the filter circuit section for each phase. Also, in the fourth and fifth embodiments, the case where the T-LCL type immittance conversion circuit is used as the filter circuit for each segment or the filter circuit for each phase has been described as an example. A T-CLC type immittance conversion circuit, other low-pass filter circuits, or band-pass filter circuits may be used as the circuit section.

(3) In the above embodiment, the power transmitting resonant circuit and the power receiving resonant circuit using series resonance have been described as examples, but the present invention is not limited to this, and the power transmitting resonant circuit and power receiving resonant circuit using parallel resonance can also be used. Well, one of them may be a resonant circuit using series resonance and the other using parallel resonance.

The present disclosure is not limited to the embodiments described above, and can be implemented in various configurations without departing from the scope of the present disclosure. For example, the technical features in the embodiments corresponding to the technical features in the respective modes described in the Summary of the Invention column may be used to solve some or all of the above problems, or Substitutions and combinations may be made as appropriate to achieve part or all. Also, if the technical features are not described as essential in this specification, they can be deleted as appropriate.

DESCRIPTION OF SYMBOLS 100... Non-contact electric power feeding device 110... Power transmission resonance circuit 120... Power transmission circuit 122... Inverter circuit 124... Immittance conversion circuit 130... Power supply circuit 205, 205B... Non-contact power receiving device 210, 210B... Power receiving resonance circuit , 210u, 210v, 210w, 210a, 210b . Rectifier circuit 228 DC/DC converter circuit Seg Contactless power supply segment

Claims (18)

A contactless power receiving device (205, 205B) that receives power contactlessly supplied from a contactless power supply device,
power receiving resonance circuits (210, 210B) having multi-phase power receiving resonance circuit units (210u, 210v, 210w, 210a, 210b);
a power receiving circuit (220, 220B) that converts the AC power received by the power receiving resonance circuit into DC power and supplies it to a load;
with
The power receiving circuit is
Power receiving side filter circuits (224, 224B) having power receiving side filter circuit units (224u, 224v, 224w, 224a, 224b) of multiple phases for adjusting AC power input from the power receiving resonant circuit units of respective phases;
a rectifier circuit (226, 226B) for converting AC power of each phase input from the power receiving side filter circuit unit of each phase into one DC power;
a power conversion circuit (228) that converts the DC power input from the rectifier circuit into power to be supplied to the load;
with
at least two of the power receiving side filter circuit units of the plurality of phases have impedance characteristics different from each other;
The power-receiving-side filter circuit units of the respective phases have impedance characteristics set so that the characteristics of the AC power of the respective phases input to the rectifier circuit from the power-receiving-side filter circuit units of the respective phases are balanced with each other. A contactless power receiving device. The contactless power receiving device according to claim 1,
The impedance characteristics of the power receiving side filter circuit units of the respective phases are the same as the impedance characteristics of the respective phases when the power receiving resonance circuit units of the respective phases of the wireless power receiving device are viewed from the side of the wireless power supply device. A contactless powered device that is configured to be characteristic. The contactless power receiving device according to claim 2,
The non-contact power receiving device, wherein the impedance characteristics of the power receiving side filter circuit section of each phase are adjusted so that the deviation of the impedance value obtained from the impedance characteristics of each phase is ±30% or less. The contactless power receiving device according to claim 2,
The non-contact power receiving device, wherein the impedance characteristics of the power receiving side filter circuit section of each phase are adjusted so that the deviation of the impedance value obtained from the impedance characteristics of each phase is ±10% or less. The contactless power receiving device according to any one of claims 1 to 4,
The non-contact power receiving device, wherein the power receiving side filter circuit section is an immittance conversion circuit, and the characteristic impedance of the immittance conversion circuit is used as the impedance characteristic of the power receiving side filter circuit section. A contactless power supply device (100) for contactlessly supplying power to a contactless power receiving device,
a power transmitting resonant circuit (110, 110E) for transmitting AC power to the power receiving resonant circuit of the contactless power receiving device;
a power transmission circuit (120, 120E) that converts DC power supplied from a power supply circuit (130) into AC power and supplies it to the power transmission resonance circuit;
a plurality of contactless powering segments (Seg) having
The power transmission circuit is
an inverter circuit (122, 122E) that converts the DC power of the power supply circuit into AC power;
a power transmission side filter circuit (124, 124E) that adjusts the AC power of the inverter circuit and supplies it to the power transmission resonance circuit;
with
at least two of the plurality of contactless power supply segments have different impedance characteristics of the power transmission filter circuit;
The power transmission side filter circuit of each wireless power supply segment has an impedance characteristic set so as to reduce a difference in characteristics of AC power supplied to the wireless power receiving device by the power transmission resonance circuit of each wireless power supply segment. A contactless power supply device. The contactless power supply device according to claim 6,
The impedance characteristics of the power transmission side filter circuits of the respective wireless power supply segments are set so as to reduce the difference in the impedance characteristics of the power transmission side filter circuits viewed from the inverter circuit in each of the wireless power supply segments. A contactless power supply device. The contactless power supply device according to claim 7,
The contactless power supply device, wherein the impedance characteristics of the power transmission side filter circuit of each of the contactless power supply segments are adjusted so that the deviation of the impedance value obtained from the impedance characteristics of each of the contactless power supply segments is ±30% or less. . The contactless power supply device according to claim 7,
The contactless power supply device, wherein the impedance characteristics of the power transmission side filter circuit of each of the contactless power supply segments are adjusted so that the deviation of the impedance value obtained from the impedance characteristics of each of the contactless power supply segments is ±10% or less. . The contactless power supply device according to any one of claims 6 to 9,
The contactless power supply device, wherein the power transmission filter circuit is an immittance conversion circuit, and the characteristic impedance of the immittance conversion circuit is used as the impedance characteristic of the power transmission filter circuit. The contactless power supply device according to any one of claims 6 to 9,
The power transmission resonance circuit (110E) has multi-phase power transmission resonance circuit units (110u, 110v, 110w),
The inverter circuit (122E) is a circuit that converts the DC power of the power supply circuit into multi-phase AC power,
The power transmission filter circuit (124E) adjusts the multi-phase AC power input from the inverter circuit and supplies the power to the multi-phase power transmission resonant circuit units (124u, 124v). , 124w),
The impedance characteristics of the power transmission side filter circuit units of the respective phases are such that the difference in the characteristics of the AC power supplied to the wireless power receiving device by the power transmission resonance circuit units of the respective phases of the wireless power supply segments is reduced. A contactless power supply device having set impedance characteristics. The contactless power supply device according to claim 11,
The contactless power supply device, wherein the impedance characteristics of the power transmission side filter circuit units of the respective phases are set so as to reduce the difference in the impedance characteristics of the power transmission side filter circuit units of the respective phases viewed from the inverter circuit. . The contactless power supply device according to claim 12,
The impedance characteristics of the power transmission side filter circuit portion of each phase are adjusted so that the deviation of the impedance value obtained from the impedance characteristics of the power transmission side filter circuit portion of each phase is ±30% or less. Power supply. The contactless power supply device according to claim 12,
The impedance characteristics of the power transmission side filter circuit portion of each phase are adjusted so that the deviation of the impedance value obtained from the impedance characteristics of the power transmission side filter circuit portion of each phase is ±10% or less. Power supply. The contactless power supply device according to any one of claims 11 to 14,
The contactless power supply device, wherein the power transmission side filter circuit section is an immittance conversion circuit, and the characteristic impedance of the immittance conversion circuit is used as the impedance characteristic of the power transmission side filter circuit section. A contactless power supply system for contactlessly supplying power from a contactless power supply device (100) to a contactless power receiving device (205, 205B),
The contactless power receiving device
a power receiving resonance circuit (210, 210B);
a power receiving circuit (220, 220B) that converts the AC power received by the power receiving resonance circuit into DC power and supplies it to a load;
with
The contactless power supply device
a power transmitting resonant circuit (110, 110E) for transmitting AC power to the power receiving resonant circuit of the contactless power receiving device;
a power transmission circuit (120, 120E) that converts DC power supplied from a power supply circuit (130) into AC power and supplies it to the power transmission resonance circuit;
a plurality of contactless powering segments (Seg) having
The power transmission circuit is
an inverter circuit (122, 122E) that converts the DC power of the power supply circuit into AC power;
a power transmission side filter circuit (124, 124E) that adjusts the AC power of the inverter circuit and supplies it to the power transmission resonance circuit;
with
at least two of the plurality of contactless power supply segments have different impedance characteristics of the power transmission filter circuit;
The power transmission side filter circuit of each wireless power supply segment has an impedance characteristic set so as to reduce a difference in characteristics of AC power supplied to the wireless power receiving device by the power transmission resonant circuit of each wireless power supply segment. A contactless power supply system. The contactless power supply system according to claim 16,
The power receiving resonance circuit has a multi-phase power receiving resonance circuit section (210u, 210v, 210w, 210a, 210b),
The power receiving circuit is
Power receiving side filter circuits (224, 224B) having power receiving side filter circuit units (224u, 224v, 224w, 224a, 224b) of multiple phases for adjusting AC power input from the power receiving resonant circuit units of respective phases;
a rectifier circuit (226, 226B) that converts AC power input from the power receiving filter circuit into DC power;
a power conversion circuit (228) that converts the DC power input from the rectifier circuit into power to be supplied to the load;
with
The contactless power supply system, wherein the power receiving side filter circuit units of the respective phases have impedance characteristics set to reduce power pulsation generated in the DC power output from the rectifier circuit. The contactless power supply system according to claim 16 or 17,
The power transmission resonance circuit (110E) has multi-phase power transmission resonance circuit units (110u, 110v, 110w),
The inverter circuit (122E) is a circuit that converts the DC power of the power supply circuit into multi-phase AC power,
The power transmission filter circuit (124E) adjusts the multi-phase AC power input from the inverter circuit and supplies the power to the multi-phase power transmission resonant circuit units (124u, 124v). , 124w),
The impedance characteristics of the power transmission side filter circuit units of the respective phases are such that the difference in the characteristics of the AC power supplied to the wireless power receiving device by the power transmission resonance circuit units of the respective phases of the wireless power supply segments is reduced. A contactless power supply system with set impedance characteristics.

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