Source: https://patents.google.com/patent/JP5658592B2/en
Timestamp: 2019-11-20 20:41:22
Document Index: 119669583

Matched Legal Cases: ['art 83', 'art 3381', 'art 3383', 'art 3382', 'art 3182', 'art 3181', 'art 3183', 'art 81', 'art 82', 'art 82', 'art 83', 'art 811', 'art 812', 'art 821', 'art 822', 'art 911', 'art 3182', 'art 3183', 'art 3381', 'art 3382', 'art 3383']

JP5658592B2 - Non-contact power feeding device for moving objects - Google Patents
Non-contact power feeding device for moving objects Download PDF
JP5658592B2
JP5658592B2 JP2011034916A JP2011034916A JP5658592B2 JP 5658592 B2 JP5658592 B2 JP 5658592B2 JP 2011034916 A JP2011034916 A JP 2011034916A JP 2011034916 A JP2011034916 A JP 2011034916A JP 5658592 B2 JP5658592 B2 JP 5658592B2
JP2011034916A
JP2012175793A (en
阿部　茂
富夫 保田
鈴木　明
明 鈴木
2011-02-21 Application filed by 国立大学法人埼玉大学, 株式会社テクノバ filed Critical 国立大学法人埼玉大学
2011-02-21 Priority to JP2011034916A priority Critical patent/JP5658592B2/en
2012-09-10 Publication of JP2012175793A publication Critical patent/JP2012175793A/en
2015-01-28 Publication of JP5658592B2 publication Critical patent/JP5658592B2/en
The present invention relates to a non-contact power feeding device for a moving body that feeds a moving body such as an electric vehicle in a non-contact manner, and easily discriminates whether or not a positional deviation during power feeding between a power transmission coil and a power receiving coil is within an allowable range It is something that can be done.
The non-contact power supply device includes a non-contact power supply transformer including a power transmission coil (primary coil) and a power reception coil (secondary coil), and a capacitor connected to the power transmission coil and the power reception coil, between the power transmission coil and the power reception coil. Electric power is supplied from the power transmission coil to the power reception coil using electromagnetic induction.
The non-contact power supply system including the non-contact power supply device includes a high-frequency power source that supplies high-frequency alternating current to a power transmission coil of the non-contact power supply device, and a secondary side that converts alternating current sent to the power receiving coil of the non-contact power supply device into direct current In a contactless power supply system for charging a vehicle, a power transmission coil connected to a high frequency power source is installed on the ground of the power supply station, and the power reception coil is mounted on the lower surface of the floor of the automobile and induced by the power reception coil. The high-frequency alternating current is rectified by a secondary rectifier installed in the vehicle and charges the secondary battery of the vehicle.
In the case of a non-contact power supply device for charging a vehicle, the horizontal displacement between the power transmission coil and the power reception coil and the fluctuation of the gap length in the vertical direction are likely to occur. If power supply is performed with a large positional deviation as it is, power supply efficiency is remarkably reduced, and inconveniences such as heating the lower surface of the vehicle floor around the power receiving coil and increasing the strength of leakage magnetic flux to the outside of the vehicle occur.
For this reason, in a non-contact power feeding system for charging a vehicle, an allowable range of positional deviation between the power transmission coil and the power receiving coil is determined, and the power receiving coil is allowed to the power transmitting coil to the vehicle to be fed. It is requested to stop so as to be within the range.
This allowable range (power supply possible range) is, for example, as shown in FIG. 20 in consideration of convenience in parking, no adverse effects of leakage magnetic flux due to misalignment, restrictions on the change range of the primary / secondary voltage ratio, and the like. Is set as follows. In FIG. 20, the power transmission coil is 3, the power reception coil is 5, and the allowable range of the center P of the power reception coil 5 with respect to the center O of the power transmission coil 3 is represented by D.
In the front-rear direction (x direction), a positional shift from the standard state (state of zero positional shift) to 45 mm is allowed.
In the left-right direction (y-direction), a positional deviation from the standard state (the state of zero positional deviation) to 150 mm is allowed.
The vertical direction (z direction) allows a positional deviation from the standard state (gap length of 70 mm) to 30 mm.
In FIG. 20, the z-direction component (length) of the line segment OP represents the mechanical gap length between the power transmission coil and the power reception coil.
In a power supply station for European buses, as shown in FIG. 21A, a concrete block 72 is arranged on the shoulder of a road in which the power transmission coil 3 is installed in the ground, and the bus rubs tires 71 against the road so that the left and right direction A method of stopping at a position where there is no positional deviation is adopted. Further, in the vertical direction, as shown in FIG. 21B, when the power receiving coil 5 is lowered and brought into contact with the ground via the spacer 73, it is designed to have an appropriate gap length.
Further, in Patent Document 1 below, as shown in FIG. 22, the power transmission coil 3 and the power reception coil 5 are configured by a coil (one-side winding coil) in which a winding is disposed on one side of a core, and the power transmission coil 3 and the power reception coil. 5 is a contactless power supply apparatus that determines that the power transmission coil 3 and the power reception coil 5 are within the power supply range when the communication coil 15 is installed in the center of the communication coil 15 and the communication sensitivity between the communication coils 15 reaches a predetermined level. Is disclosed.
As non-contact power feeding circuit systems, various systems described in the following Patent Document 2, Non-Patent Documents 1 and 2 are known as will be described later.
JP 2008-288889 A International Publication No. 2007-029438
Kenji Kanai, Hiroyoshi Kaneko, Shigeru Abe, Voltage ratio problem and its solution for mobile contactless power transfer using primary series and secondary parallel capacitors, Semiconductor Power Conversion Study Group, SPC-10-021, (2010.1.29) M. Budhia, GA Covic, and JT Boys "A New Magnetic Coupler for Inductive Power Transfer Electric Vehicle Charging Systems" to be presented at 36th Annual Conference of the IEEE Industrial Electronics Society, IECON 2010, Phoenix AZ, USA, Nov. 7- 10, 2010)
However, the method in which the right and left positions of the vehicle are regulated by the concrete block and the power receiving coil is guided to the power supply range is difficult to drive and the tires may be damaged, so that it is difficult to apply to a general passenger car. Further, the method of moving the power receiving transformer up and down complicates the system and leads to an increase in cost. In addition, these mechanical position control methods force power supply in a narrow allowable range, and a non-contact power supply transformer that can expand the power supply range by devising a coil winding method or the like. I can't take advantage of it.
Further, the method for determining the power supplyable range based on the communication sensitivity between the communication coils provided in the power transmission coil and the power reception coil is to determine whether the vehicle should be advanced or not when the vehicle is determined to be out of the power supplyable range. There is a drawback that it is difficult to understand the direction of correction, whether it should be done, or whether it should be moved to the right or left. Moreover, the power supply possible range is also determined by the size of the transmission range of the communication coil, and it is difficult to match the performance of the non-contact power supply device.
The present invention was devised in view of such circumstances, and can easily determine whether or not the positional deviation between the power transmission coil and the power receiving coil is within the allowable range, and the positional deviation outside the allowable range can be determined. It aims at providing the non-contact electric power feeder for moving bodies which can identify the directionality at the time of correction.
According to the present invention, a power transmission coil connected to a high-frequency power source is installed on the ground side, a power reception coil facing the power transmission coil via a gap is installed on the mobile body side, and power is supplied from the power transmission coil to the power reception coil. A contact power feeding device, wherein a power transmitting coil and a power receiving coil have an H-shaped core, a core portion parallel to the core constitutes a magnetic pole portion, and a core portion connecting intermediate portions of opposing magnetic pole portions is an electric wire. An electric wire winding part for winding is configured, and the power receiving coil is installed on the moving body so that the parallel magnetic pole portions are orthogonal to the front-rear direction of the moving body, and the H-shaped core of the power transmitting coil or the power receiving coil The at least one of the magnetic pole portions includes a first search coil SC1 interlinked with a magnetic flux traveling in the direction from the wire winding portion toward one end of the magnetic pole portion and a magnetic flux traveling in the opposite direction, and from the wire winding portion to the magnetic pole. Direction of the other end of the part A second search coil SC2 linked to the traveling magnetic flux and the magnetic flux traveling in the opposite direction; and a second search coil SC2 for identifying whether or not the power transmitting coil and the power receiving coil are within a power feedable range. It is characterized by comprising a power supplyable range identifying means using a voltage detected by one search coil SC1 or second search coil SC2.
Since the detection voltages of the first and second search coils SC1 and SC2 are highly sensitive to the positional deviation in the horizontal direction, the positional deviation in the horizontal direction between the power receiving coil and the power transmission coil is detected using the detection voltages of SC1 and SC2. It can be determined whether or not it is within an allowable range.
Moreover, in the non-contact power feeding device for a moving body of the present invention, the H-shaped core of the power transmission coil or the power receiving coil further proceeds in the magnetic flux that goes straight through the magnetic pole portion in the extension direction of the wire winding portion and in the opposite direction. The third search coil SC3 interlinking with the magnetic flux is provided, and the power supply range identifying means also uses the voltage detected by the third search coil SC3, and the power transmission coil and the power reception coil are within the power supply range. It is characterized by identifying whether it exists in.
Since the detection voltage of the third search coil SC3 is highly sensitive to the positional deviation in the front-rear direction, whether the positional deviation in the front-rear direction between the power receiving coil and the power transmission coil is within an allowable range using the detection voltage of the SC3. Can be determined.
The contactless power feeding device for a moving body of the present invention includes a primary side capacitor connected in series between a power transmission coil and a high frequency power source, and a secondary side resonance capacitor connected in parallel to the power receiving coil. When the primary voltage which is the output voltage of V IN is V IN , the secondary voltage applied to both ends of the power receiving coil is V 2 , the number of turns of the power transmitting coil is N 1 , and the number of turns of the power receiving coil is N 2 ,
b = (V IN / V 2 ) (N 2 / N 1 ) (Equation 1)
It is also characterized by identifying whether or not the power transmission coil and the power reception coil are within the power feedable range using the value of b represented by
In a circuit in which a primary capacitor having an appropriate value is connected in series to the power transmission coil, and a secondary resonance capacitor is connected in parallel to the power reception coil, (Equation 1) holds, and the primary voltage V IN and the secondary voltage are expressed as V 2. And the turn ratio a (= N 1 / N 2 ) of the power transmission coil and the power reception coil, the value of b can be calculated. Since the voltage ratio between the primary voltage and the secondary voltage is highly sensitive to the gap length misalignment, the value of b is used to determine whether the misalignment in the gap length between the power receiving coil and the power transmitting coil is within an allowable range. Can be determined.
In the non-contact power feeding device for a moving body of the present invention, the first search coil SC1 and the second search coil SC2 are wound around the outer periphery of the magnetic pole part so as to include the magnetic pole part in the coil, Coil SC3 is arranged on the surface of the magnetic pole part so that the surface of the magnetic pole part extending in the extending direction of the wire winding part and the side surface of the magnetic pole part orthogonal to the extending direction are included in the coil.
The first and second search coils SC1 and SC2 generate an induced electromotive force according to a change in magnetic flux passing through the magnetic pole portion in the coil, and the third search coil SC3 is a magnetic flux passing through the coil cross-sectional area. An induced electromotive force is generated in accordance with the change in.
Further, in the non-contact power feeding device for moving body of the present invention, the magnetic pole portion of the H-shaped core of the power transmission coil or the power receiving coil is composed of two cores arranged with a gap therebetween, and the first search coil SC1 and The second search coil SC2 is wound around the outer periphery of the two cores so that the two cores are included in the coil, and the third search coil SC3 is wound around a core material that connects the gap between the two cores. You may make it turn.
By doing so, the detection accuracy of the third search coil SC3 can be increased.
Further, in the non-contact power feeding device for a moving body according to the present invention, when the power feeding range identification unit does not have the power transmission coil and the power receiving coil within the power feeding range, information on the moving direction for entering the power feeding range is provided. provide.
Therefore, it is easy to understand how to deal with when the power supply is out of range.
Further, in the non-contact power feeding device for a moving body according to the present invention, the power feedable range identifying means is installed in the vehicle, and information on the moving direction provided by the power feedable range identifying means is provided by the car navigation device equipped in the vehicle. You may make it display on a display screen.
Information on the moving direction for entering the power supply range can be provided through the human interface.
The non-contact power feeding device for a moving body of the present invention can accurately determine whether or not the positional deviation between the power transmission coil and the power receiving coil is included in the power feedable range. In addition, when the power supply is out of the power supply range, it can be recognized in which direction the position of the moving body should be corrected.
The figure which shows the non-contact electric power feeding system for vehicle charge Circuit diagram of FIG. The figure which shows the detailed equivalent circuit of the non-contact electric power feeding transformer part in the circuit of FIG. Diagram showing an H-shaped core The figure which shows the magnetic flux of the non-contact electric power feeding transformer whose power transmission coil and power receiving coil are double-sided coils Diagram showing ≡ direction and y direction of vehicle The figure which shows the power transmission coil of the non-contact electric power feeder for moving bodies which concerns on embodiment of this invention. The figure which shows the detection voltage of the search coil with the position shift of the front and rear direction The figure which shows magnetic field distribution when the power transmission coil and power receiving coil of a non-contact electric power feeding transformer have shifted | deviated to x direction. The figure which shows the detection voltage of the search coil with the position shift in the horizontal direction The figure which shows magnetic field distribution when the power transmission coil and power receiving coil of a non-contact electric power feeding transformer have shifted | deviated to the y direction. The figure which shows the relationship between the positional deviation of front and rear and right and left and the value of b (gap length 40mm) The figure which shows the relationship between the positional deviation of front and rear and right and left and the value of b (gap length 70mm) The figure which shows the relationship between the positional deviation of front and rear and right and left and the value of b (gap length 100mm) The figure which shows the electric power feeding station in which the electric power feeding possible range identification apparatus and the display apparatus were installed Flow chart for determining the allowable range of misalignment The figure which shows the range discriminate | determined within the tolerance | permissible_range of a position shift with the flowchart of FIG. The figure which shows the other example of the power transmission coil which concerns on embodiment of this invention The figure which shows the vehicle by which the electric power feeding possible range identification apparatus and the display apparatus were installed Example of allowable range of misalignment The figure which shows the discrimination method 1 of the conventional position shift. The figure which shows the discrimination method 2 of the conventional position shift. The figure which shows the non-contact electric power feeding system which uses a parallel capacitor for the primary side described in the nonpatent literature 1 The figure which shows the non-contact electric power feeding system which uses a parallel capacitor for the primary side described in the nonpatent literature 2
FIG. 1 schematically shows a form when the non-contact power feeding device of the present invention is used for charging a plug-in hybrid vehicle.
A plug-in hybrid vehicle that receives charging is equipped with a motor 53 as a drive source together with an engine 54, a secondary battery 51 that is a power source for the motor, and an inverter 52 that converts the direct current of the secondary battery into alternating current and supplies the motor to the motor. And.
The non-contact power feeding system that feeds power to the secondary battery 51 includes one of a rectifier 10 that converts AC of commercial power into DC, an inverter 20 that generates high-frequency AC from DC, and a non-contact power transformer 30 on the ground side. A power transmission coil 31 and a primary side series capacitor 32 connected in series to the power transmission coil. On the vehicle side, a power reception coil 33 which is the other of the non-contact power supply transformer 30 and an AC for a secondary battery. Is converted to direct current, and a secondary side parallel resonant capacitor 34 connected in parallel between the power receiving coil and the rectifier.
FIG. 2 shows a circuit diagram of this non-contact power feeding system. FIG. 3 shows a detailed equivalent circuit of the circuit including the non-contact power feeding transformer, the primary side series capacitor, and the secondary side parallel capacitor in FIG.
In this circuit, as described in Patent Document 2 (International Publication No. 2007-029438), the value C S of the primary side series capacitor and the value C P of the secondary side parallel resonant capacitor are set as follows: To do.
ω 0 = 2πf 0 (Equation 2)
1 / ω 0 C P = ω 0 L 2 = x P = x 0 '+ x 2 (Equation 3)
1 / ω 0 C S = x S '= {(x 0 ' · x 2 ) / (x 0 '+ x 2 )} + x 1 ' (Equation 4)
(Where f 0 is the frequency of the high frequency power supply, x P is the capacitive reactance of the secondary side parallel capacitor C P , L 2 is the self-inductance of the receiving coil, x S 'is the primary side series capacitor C S converted to the secondary side. Capacity reactance, x 0 ': excitation reactance converted to secondary side, x 1 ': primary leakage reactance converted to secondary side, x 2 : secondary leakage reactance)
(Equation 3) shows the condition that the secondary side parallel capacitor resonates with the self-inductance of the receiving coil and the power supply frequency, and (Equation 4) shows the high frequency power supply when the secondary load is represented by the equivalent resistance R L. The impedance on the side of the non-contact power feeding device viewed from the output of FIG. 4 is a pure resistance, and the output power factor of the high frequency power source is 1. When the output power factor is 1, the apparent power of the high-frequency power source matches the output power and the power source can be downsized. In addition, when the power source is composed of a bridge type inverter as shown in FIG. There is a great advantage that the efficiency of the inverter is increased. In the case of a contactless power supply device for an electric vehicle, the secondary load RL can generally be regarded as a pure resistance.
If it does so, a non-contact electric power feeding transformer will become equivalent to an ideal transformer, and the relationship of following (Formula 5) (Formula 6) will be materialized.
V IN = ab V 2 , I IN = I D / ab (Equation 5)
a = N 1 / N 2, b = x 0 '/ (x 0' + x 2) ( 6)
a is the turn ratio between the power transmission coil and the power reception coil. b is a value very similar to the coupling coefficient k. From the primary voltage V IN , the secondary voltage V 2, and the turns ratio a,
b = (V IN / V 2 ) (1 / a) (Equation 7)
Can be calculated by
The gap length between the power transmission coil 31 and the power reception coil 33 greatly affects the voltage ratio between the primary voltage V IN and the secondary voltage V 2 . Therefore, the voltage ratio (V IN / V 2 ) can be an index for determining whether or not the gap length is appropriate. In the present invention, the value b is used as an index of the voltage ratio (V IN / V 2 ).
As shown in FIG. 4, the power transmission coil 31 and the power reception coil 33 have an H-shaped core (H-type core) 80. The parallel core portions 81 and 82 of the H-shaped core 80 constitute a magnetic pole portion through which magnetic flux enters and exits, and the core portion 83 that connects intermediate portions of the opposing magnetic pole portions 81 and 82 is an electric wire around which the electric wire 50 is wound. A winding part 83 is configured.
In the non-contact power supply transformer in which the power transmission coil 31 and the power reception coil 33 are formed by double-sided coils in which an electric wire is wound around an H-shaped core, the main magnetic flux 35 is a magnetic pole portion of the H-shaped core of the power transmission coil 31 as shown in FIG. 3181 enters the magnetic pole part 3381 of the H-type core of the power receiving coil 33, passes through the core of the electric wire winding part 3383 around which the electric wire 50 is wound, and the magnetic pole of the H-type core of the power transmission coil 31 from the other magnetic pole part 3382. It enters the part 3182 and circulates so as to reach the magnetic pole part 3181 through the core of the wire winding part 3183. Then, at the next moment, the circuit travels in the reverse route, and this is repeated alternately. In this non-contact power supply transformer, aluminum plates 65 and 66 are disposed on the back surface of the coil in order to magnetically shield the leakage magnetic flux.
The power receiving coil 33 is configured so that the parallel magnetic pole portions 81 and 82 are orthogonal to the longitudinal direction of the automobile (x direction in FIG. 6) and parallel to the lateral direction of the automobile (y direction in FIG. 6). It is installed outside.
As shown in the perspective view of FIG. 7A, the plan view of FIG. 7B, and the side view of FIG. A search coil Cy1a (the first search coil SC1) interlinked with a magnetic flux traveling in the direction of one end 811 (and a magnetic flux traveling in the opposite direction), and the other end 812 of the magnetic pole portion 81 from the wire winding portion 83. The search coil Cy2a (the second search coil SC2) interlinking with the magnetic flux traveling in the direction (and the magnetic flux traveling in the opposite direction), and the wire winding portion 83 to the one end 821 of the magnetic pole portion 82. The search coil Cy1b (the first search coil SC1) interlinking with the magnetic flux (and the magnetic flux traveling in the opposite direction), and the magnetic flux traveling in the direction from the wire winding portion 83 to the other end 822 of the magnetic pole portion 82 ( And the magnetic flux traveling in the opposite direction A search coil Cy2b (second search coil SC2) interlinked with the magnetic flux 81 and a magnetic flux linearly traveling in the magnetic pole portion 81 in the extending direction of the wire winding portion 83 (and a magnetic flux traveling in the opposite direction). Cx1 (the third search coil SC3) and a search coil Cx2 (the third search coil SC3) that interlinks with the magnetic flux that travels straight in the magnetic pole portion 82 in the extending direction of the wire winding portion 83 (and the magnetic flux that travels in the opposite direction). And a search coil SC3).
The search coils Cy1a and Cy2a are wound around the core member constituting the magnetic pole part 81, and the search coils Cy1b and Cy2b are wound around the core member constituting the magnetic pole part 82.
Further, the search coil Cx1 is formed on these surfaces so that the opening of the coil straddles the surface of the magnetic pole portion 81 extending in the extending direction of the electric wire winding portion 83 and the side surface of the magnetic pole portion 81 orthogonal to the extending direction. The search coil Cx2 is arranged on these surfaces so that the opening of the coil straddles the surface of the magnetic pole portion 82 extending in the extending direction of the electric wire winding portion 83 and the side surface of the magnetic pole portion 82 orthogonal to the extending direction. Is arranged. In this example, the number of turns of all search coils is set to 10 turns.
These search coils generate an induced electromotive force in accordance with a change in magnetic flux in the coil opening, and the voltage of the electromotive force is input to a power supply range identification unit (not shown). Using the voltage, it is identified whether or not the power transmission coil 31 and the power reception coil 33 are within the power supply possible range.
When the gap length is set to be constant (70 mm) for the power transmission coil 31 and the power reception coil 33 is shifted in the + x direction (forward direction: the direction of the search coil Cx1), the voltage Vx1 of the search coil Cx1 and the search coil Cx2 The voltage Vx2 changes as shown in FIG. In FIG. 8, the horizontal axis indicates the amount of displacement in the x direction, and the vertical axis indicates the voltages of the search coils Cx1 and Cx2. FIG. 8 shows the voltages Vx1 and Vx2 of the search coils Cx1 and Cx2 when the shift amount in the y direction (left and right direction) is increased from 0 (standard state) in units of 50 mm.
From FIG. 8, it can be seen that the detection voltage Vx1 of the search coil Cx1 monotonously increases as the amount of shift in the + x direction (forward direction) increases. On the other hand, when shifted in the −x direction (backward direction), the detection voltage of the search coil Cx2 increases monotonously according to the amount of shift.
Thus, the voltages Vx1 and Vx2 of the search coil Cx1 and the search coil Cx2 are highly sensitive to displacement in the x direction (front-rear direction), and the directionality of the displacement can be known from the voltages Vx1 and Vx2.
FIG. 9 shows the magnetic field distribution when the power transmission coil (lower side) and the power receiving coil (upper side) of the non-contact power supply transformer that feeds with electric power of 100 W are shifted by 45 mm in the x direction. From this figure, it can be seen that the amount of magnetic flux at the magnetic pole position (circle) of the power transmission coil where the search coils Cx1 and Cx2 are installed is different between before and after the power transmission coil.
FIG. 10 shows the detection voltage of the search coil when the gap length is set to be constant (70 mm) and the power receiving coil 33 is shifted in the + y direction. Here, the average value of the detection voltage Vy1a of the search coil Cy1a and the detection voltage Vy1b of the search coil Cy1b is Vy1 (= (Vy1a + Vy1b) / 2), and the detection voltage Vy2a of the search coil Cy2a and the detection voltage Vy2b of the search coil Cy2b The average value is represented as Vy2 (= (Vy2a + Vy2b) / 2) on the vertical axis, and the horizontal axis represents the amount of deviation in the y direction. FIG. 10 shows voltages Vy1 and Vy2 when the amount of deviation in the x direction (forward direction) is increased from 0 (standard state) in units of 15 mm.
From FIG. 10, it can be seen that the detection voltage of the search coils Cy1a and Cy1b increases monotonously as the amount of deviation in the + y direction (the direction of the search coils Cy1a and Cy1b) increases. On the other hand, when shifted in the −y direction (the direction of the search coils Cy2a and Cy2b), the detection voltages of the search coils Cy2a and Cy2b increase monotonously according to the shift amount.
As described above, the voltages Vy1 and Vy2 of the search coils Cy1a and Cy1b and the search coils Cy2a and Cy2b are highly sensitive to the positional deviation in the y direction (left and right direction), and the directionality of the positional deviation is known from the voltages Vy1 and Vy2. be able to.
FIG. 11 shows the magnetic field distribution when the power transmission coil (lower side) and the power reception coil (upper side) of the non-contact power supply transformer that feeds with electric power of 100 W are displaced by 150 mm in the y direction. From this figure, it can be seen that the amount of magnetic flux at the magnetic pole position (elliptical mark) of the power transmission coil in which the search coils Cy1a and Cy2a are installed is different between the left and right of the power transmission coil.
FIG. 12 shows the result of measuring the value of b by setting the gap length to 40 mm (lower limit of the power supply possible range in FIG. 20) and changing the amount of deviation in the x and y directions. FIG. 13 shows the result of measuring the value of b by setting the gap length to 70 mm (standard state) and changing the amount of deviation in the x and y directions. FIG. 14 shows the result of measuring the value of b by setting the gap length to 100 mm (upper limit of the power supply range) and changing the amount of deviation in the x and y directions. 12, 13, and 14 indicate the allowable ranges in the front-rear direction and the left-right direction in FIG. 20.
From FIG. 12, FIG. 13, and FIG. 14, it can be seen that the value of b changes greatly due to the gap length misalignment (z position misalignment), and the sensitivity to the z direction misalignment is high. Moreover, the directionality of gap length deviation can be known from the value of b.
Therefore, the allowable range of positional deviation of the power receiving coil with respect to the power transmitting coil is indicated by the value of b, the detection voltages Vy1, Vy2 of the search coils Cy1a, Cy1b, Cy2a, Cy2b, and the detection voltages Vx1, Vx2 of the search coils Cx1, Cx2. It is possible to use and set.
When the permissible range is set using these indexes, the directionality of the positional deviation can be known, so that correction when it is outside the permissible range is easy.
For example, as shown in FIG. 15, a power feedable range identifying device 74 that obtains detection voltages of search coils Cx1, Cx2, Cy1a, Cy1b, Cy2a, and Cy2b provided in the transmission coil 31 and determines the appropriateness of the stop position; In addition, a display device 75 that displays information sent from the power supply range identification device 74 to the driver is installed in the power supply station, and whether or not the vehicle is stopped within the power supply range is out of the power supply range. In this case, it is possible to display on the display device 75 in which direction the stop position should be corrected.
The feedable range identifying device 74 is configured to stop the vehicle in the front-rear direction when the difference between the detection voltage Vx1 of the search coil Cx1 and the detection voltage Vx2 of the search coil Cx2 is less than a threshold value and Vx1 and Vx2 are equal to or less than a specified value. Is deemed appropriate. Further, when the difference between the voltage Vy1 calculated from the detection voltages of the search coils Cy1a and Cy1b and the voltage Vy2 calculated from the detection voltages of the search coils Cy2a and Cy2b is less than a threshold value, and Vy1 and Vy2 are equal to or less than a specified value, The stop position in the left-right direction of the vehicle is determined to be appropriate. Also, the secondary voltage information is obtained from the vehicle communication means 55 and the value of b is calculated by (Equation 7) (V IN , where a is a standardized value). If the gap length is within the range, it is determined that the gap length is appropriate.
Then, the display device 75 displays that power can be supplied.
Further, when the difference between Vx1 and Vx2 exceeds the threshold value and Vx1> Vx2, the power feedable range identifying device 74 displays “Retreat” on the display device 75, and when Vx1 <Vx2 “Please move forward” is displayed. When the difference between Vy1 and Vy2 exceeds the threshold value and Vy1> Vy2, “Please move to the right” is displayed on the display device 75, and when Vy1 <Vy2, “Please move to the left”. Is displayed. Further, when the value of b is larger than the specified range, it is displayed so as to move to a power supply lane with a wide gap length, and when the value of b is smaller than the specified range, it is displayed so as to move to a power supply lane with a narrow gap length.
The display device 75 may be a colored lamp such as a traffic signal.
Further, the information of the power supply possible range identification device 74 may be sent to the vehicle by the communication means 55 and displayed on the display device 57 in the vehicle.
As is apparent from FIGS. 13 and 14, when the allowable range of positional deviation is set by dimensions as shown in FIG. 20, the value of b is low (the power feeding efficiency is low) even within the allowable range. In the case where the allowable range is set by the value of b and the detection voltage of the search coil, a precise allowable range can be set by combining the value of b and the detection voltage of the search coil. Become.
FIG. 16 shows an example of an allowable range determination flowchart.
In this determination, in determining the allowable range of misalignment,
(1) As can be seen from FIGS. 12, 13, and 14, the value of b is highly sensitive to the gap length displacement (z-direction displacement), but the front-rear direction (x-direction) and the left-right direction (y It is also affected by misalignment in the direction.
(2) Similarly, the search coil voltages Vx1 and Vx2 are highly sensitive to displacement in the x direction, but are also affected by displacement in the y and z directions.
(3) Further, the search coil voltages Vy1 to Vy4 are highly sensitive to displacement in the y direction, but are also affected by displacement in the x and z directions.
(4) Further, as can be seen from FIGS. 8 and 10, the voltage of the search coil increases uniformly as the positional deviation increases.
The measurement results are used.
Step 1: From the measurement result of FIG. 14, when the value of b is smaller than 0.2, since the gap length exceeds the upper limit of the power supply possible range (FIG. 20), it is out of the power supply range. Further, from the measurement result of FIG. 12, when b exceeds 0.55, the gap length is below the lower limit of the power supply range, and therefore, it is out of the power supply range. If 0.2 ≦ b ≦ 0.55, the process proceeds to step 2.
Step 2: From the measurement results of FIG. 10, when the search coil voltages Vy1 and Vy2 exceed 22V, they exceed the allowable limit in the y direction, and are thus out of the power supply range. If Vy1, Vy2 ≦ 22V, the process proceeds to step 3.
Step 3: From the measurement results of FIGS. 8 and 13, when Vx1 and Vx2 <3.1V, the range is within the allowable range when 0.2 ≦ b <0.35.
Step 4: In the case of Vx1, Vx2 <3.3V where the positional deviation in the front-rear direction is larger than that in Step 3, when the value of b is further increased and 0.35 ≦ b <0.45, To do.
Step 5: Even if the condition of Step 4 is not satisfied, from the measurement result of FIG. 12, if 0.45 ≦ b <0.55, it is within the allowable range.
FIG. 17 shows an allowable range of misalignment determined by the flowchart of FIG.
As described above, when the allowable range of positional deviation is set using the value of b and the detection voltage of the search coil as an index, a precise allowable range can be set.
FIG. 18 shows another example of the power transmission coil.
In this power transmission coil, each of the magnetic pole portions of the H-shaped core is composed of two core members 911 and 912, 921 and 922, and the search coils Cy1a and Cy2a are wound around the outer periphery of the two core members 911 and 912. The search coils Cy1b and Cy2b are wound around the outer periphery of the two core members 921 and 922, and the search coil Cx1 is wound around the outer periphery of the core member 913 that connects the gap between the core members 911 and 912. The search coil Cx2 is wound around the outer periphery of the core member 923 that connects the gap between the core members 921 and 922.
In this power transmission coil, the search coils Cx1 and Cx2 can capture the magnetic flux that travels straight in the extension direction of the wire winding portion (and the magnetic flux that travels in the opposite direction) without leakage, so that the detection accuracy of the search coils Cx1 and Cx2 is improved. Therefore, it is possible to determine the allowable range for the positional deviation in the front-rear direction with high accuracy.
Here, as a non-contact power feeding method, a method in which a series capacitor is inserted on the primary side and a parallel resonant capacitor is inserted on the secondary side is shown. A method described in Document 2 in which a parallel capacitor is inserted on the primary side and a parallel resonant capacitor is inserted on the secondary side, and other methods are known. FIG. 23 shows a circuit system described in Non-Patent Document 1, and FIG. 24 shows a circuit system described in Non-Patent Document 2.
Even in these circuit systems, the first, second, and third search coils can be used as an index of positional deviation.
Also, here, using the detection voltages of the first, second, and third search coils, and the value of b, the x direction (front and rear direction), y direction (left and right direction) of the power receiving coil with respect to the power transmission coil, and The case where it is determined whether or not the positional deviation in the z direction (gap length) is within the allowable range has been described. For example, the positional deviation in the front-rear direction is determined by setting the stop position in the front-rear direction of the vehicle with the tire stopper 7 in FIG. It is assumed that the gap length is assumed to be constant, and whether or not the positional deviation in the left-right direction is possible is determined using the detection voltages of the first and second search coils.
Further, assuming that the gap length is constant, the possibility of positional deviation in the left-right direction is determined using the detection voltages of the first and second search coils, and the possibility of positional deviation in the front-rear direction is determined by the third search. It is also possible to discriminate using the detected voltage of the coil.
In addition, here, the case where the first, second, and third search coils are provided toward the H-shaped core of the power transmission coil has been described. However, the first, second, and third search coils are disposed toward the H-shaped core of the power receiving coil. It is also possible to provide a search coil. At this time, the H-type core of the power receiving coil is configured as shown in FIGS.
FIG. 19 shows a case where a power feedable range identifying device 56 that acquires the detection voltage of the search coil of the power receiving coil 33 and determines whether the stop position is appropriate and a display device 57 that displays the determination information are provided in the vehicle. ing.
The power feedable range identification device 56 can determine whether the stop position is appropriate before, after, and from the left and right from the detection voltage of the search coil, and when the stop position is not appropriate, which direction should be corrected? Can be identified. When determining the suitability of the gap length, the value of b can be calculated by obtaining information on the secondary voltage from the vehicle (Equation 7) (V IN , a is a standardized value). Alternatively, the value of V IN may be transmitted from the ground inverter to the in-vehicle power supply range identifying device 56 by the communication means 55).
The display device 57 can use a display screen of a car navigation device installed in the vehicle, and the correction direction instructed from the power supply range identification device 56 when the stop position is not appropriate is displayed on the car navigation screen. It is also possible to guide the movement of the vehicle by displaying it with an arrow or the like.
The non-contact power feeding device for a moving body of the present invention can accurately determine whether or not the positional deviation between the power transmission coil and the power receiving coil is included in the power feedable range. Can be widely used on the body.
DESCRIPTION OF SYMBOLS 3 Power transmission coil 5 Power reception coil 7 Tire stop 10 Rectifier 20 Inverter 30 Non-contact electric power supply transformer 31 Power transmission coil 32 Primary side series capacitor 33 Power reception coil 34 Secondary side parallel resonance capacitor 35 Main magnetic flux 40 Rectifier 50 Electric wire 51 Secondary battery 52 Inverter 53 Motor 54 Engine 55 Communication means 56 Power supply range identification device 57 Display device (inside the vehicle)
65 Aluminum plate 66 Aluminum plate 71 Tire 72 Concrete block 73 Spacer 74 Feedable range identification device 75 Display device (ground)
80 H-type core 81 Magnetic pole part 82 Magnetic pole part 83 Electric wire winding part 811 Magnetic pole part end part 812 Magnetic pole part end part 821 Magnetic pole part end part 822 Magnetic pole part end part 911 Core member 912 Core member 913 Core member 921 Core member 922 Core member 923 Core member 3181 Magnetic pole part 3182 Magnetic pole part 3183 Electric wire winding part 3381 Magnetic pole part 3382 Magnetic pole part 3383 Electric wire winding part Cx1 Search coil Cx2 Search coil Cy1a Search coil Cy1b Search coil Cy2a Search coil Cy2b Search coil
A power transmission coil connected to a high frequency power source is installed on the ground side, a power reception coil facing the power transmission coil via a gap is installed on the mobile body side, and power is supplied from the power transmission coil to the power reception coil. A power feeding device,
The power transmission coil and the power reception coil have an H-shaped core, and the parallel core portion of the core constitutes the magnetic pole portion, and the core portion that connects the intermediate portion of the opposing magnetic pole portion winds the electric wire The wire winding part of
The power receiving coil is installed on the moving body so that the parallel magnetic pole portions are orthogonal to the front-rear direction of the moving body,
The H-shaped core of the power transmission coil or the power receiving coil has at least one of the magnetic pole portions interlinked with a magnetic flux traveling in the direction from the wire winding portion toward one end of the magnetic pole portion and a magnetic flux traveling in the opposite direction. A first search coil, and a second search coil interlinked with the magnetic flux traveling from the wire winding portion toward the other end of the magnetic pole portion and the magnetic flux traveling in the opposite direction,
Further, a power feedable range identifying unit that uses a voltage detected by the first search coil or the second search coil to identify whether the power transmission coil and the power receiving coil are within a power feedable range. A non-contact power feeding device for a moving body.
2. The contactless power supply device for a moving body according to claim 1, wherein the H-shaped core of the power transmission coil or the power reception coil further includes a magnetic flux that goes straight through the magnetic pole portion in the extending direction of the wire winding portion, and A third search coil interlinked with the magnetic flux traveling in the opposite direction; and the power supply range identifying means also uses the voltage detected by the third search coil, and A non-contact power feeding apparatus for a moving body that identifies whether or not a power receiving coil is within a power feedable range.
The contactless power supply device for a moving body according to claim 1 or 2, wherein a primary side capacitor connected in series between the power transmission coil and the high frequency power source, and a secondary side connected in parallel to the power reception coil A primary capacitor that is an output voltage of the high-frequency power source is V IN , a secondary voltage applied to both ends of the power receiving coil is V 2 , the number of turns of the power transmitting coil is N 1 , and the number of turns of the power receiving coil is N 2 , the power supply range identification means is b = (V IN / V 2 ) (N 2 / N 1 )
A non-contact power feeding apparatus for a moving body that identifies whether or not the power transmission coil and the power receiving coil are within a power feedable range using the value of b represented by:
The contactless power feeding device for a moving body according to claim 1, wherein the first search coil and the second search coil are wound around an outer periphery of the magnetic pole part so as to include the magnetic pole part in the coil. A non-contact power feeding device for a moving body.
3. The non-contact power feeding device for a moving body according to claim 2, wherein the third search coil is perpendicular to the surface of the magnetic pole portion extending in the extending direction of the wire winding portion. And a side surface of the magnetic pole part so as to be included in the coil.
The contactless power supply device for a moving body according to claim 2, wherein the H-shaped core of the power transmission coil or the power reception coil is composed of two cores in which the magnetic pole portion is arranged with a gap between them. The first search coil and the second search coil are wound around the outer periphery of the two cores so that the two cores are included in the coil, and the third search coil is the two search coils. A non-contact power feeding device for a moving body, which is wound around a core material connecting gaps between cores.
The contactless power supply device for a moving body according to claim 1 or 2, wherein the power supply range identification means is within a power supply range when the power transmission coil and the power reception coil are not within the power supply range. A non-contact power feeding device for a moving body, characterized by providing information on a moving direction for entering.
The contactless power supply device for a moving body according to claim 7, wherein the power supply range identification unit is installed in a vehicle, and the information on the moving direction provided from the power supply range identification unit is in the vehicle. A non-contact power feeding device for a moving body, which is displayed on a display screen of a car navigation device installed in the vehicle.
JP2011034916A 2011-02-21 2011-02-21 Non-contact power feeding device for moving objects Expired - Fee Related JP5658592B2 (en)
JP2011034916A JP5658592B2 (en) 2011-02-21 2011-02-21 Non-contact power feeding device for moving objects
PCT/JP2012/053996 WO2012115047A1 (en) 2011-02-21 2012-02-20 Contactless power transfer device for moving part
EP12749560.4A EP2680398B1 (en) 2011-02-21 2012-02-20 Contactless power transfer device for moving part
US14/000,332 US8963489B2 (en) 2011-02-21 2012-02-20 Contactless power transfer device for moving object
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JP2012175793A JP2012175793A (en) 2012-09-10
JP5658592B2 true JP5658592B2 (en) 2015-01-28
ID=46720824
JP2011034916A Expired - Fee Related JP5658592B2 (en) 2011-02-21 2011-02-21 Non-contact power feeding device for moving objects
US (1) US8963489B2 (en)
EP (1) EP2680398B1 (en)
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