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Patent
Technova | Date: 2017-02-08

On the ground, a plurality of primary power supply transformers are separately installed with a longitudinal direction of magnetic poles matching a vehicle traveling direction. The primary power supply transformers each include a double-sided coil with an H-shaped core around which a wire is wound. On a vehicle, a secondary power supply transformer including an H-shaped core is mounted with a longitudinal direction of magnetic poles matching a vehicle front-back direction. The distance between the primary power supply transformers is set such that the distance between the centers of the magnetic poles of the neighboring primary power supply transformers does not exceed 3D where D represents the size of the magnetic poles.


Patent
Technova and Saitama University | Date: 2014-07-16

[SUMMARY] A contactless power transfer system for a movable object includes: a power transmission coil 31 installed on a ground side; and a power reception coil 32 positioned opposite the power transmission coil across a gap, and installed on a movable object side. Power is transferred from the power transmission coil to the power reception coil by electromagnetic induction. The contactless power transfer system includes a foreign object detector 50 and a foreign object removing apparatus 70. The foreign object detector 50 detects, based on a difference between a standard value and a measured value obtained by supplying electrical power for foreign object detection purpose to the power transmission coil, presence or absence of a metallic foreign object 100 on the power transmission coil. When the metallic foreign object 100 is detected, the foreign object detector 50 outputs a foreign object detection signal. The foreign object removing apparatus 70 removes, upon detection of the metallic foreign object 100, the metallic foreign object 100 from the power transmission coil 31. Thus, a metallic foreign object present on the transmission coil can be detected with a high degree of accuracy and can be removed.


Patent
Technova and Saitama University | Date: 2014-01-01

Provided is a contactless power transfer device for a moving object, and in the contactless power transfer device, it can be simply determined whether a positional deviation between a power transmission coil and a power receiving coil is within an allowable range. Each of the power transmission coil and the power receiving coil comprises an H-shaped core, and search coils (Cy1a, Cy1b, Cy2a, Cy2b, Cx1, and Cx2) are installed on a magnetic pole object of the H-shaped core of the power transmission coil. A y-direction positional deviation between the power transmission coil and the power receiving coil is detected using voltages measured at Cy1a,Cy1b, Cy2a, and Cy2b, and an x-direction positional deviation is detected using voltages measured at Cx1 and Cx2. In addition, the directivity of positional deviation can be checked in the contactless power transfer device.


At least one of a power transmission coil (10) and a power reception coil (20) is configured by a coupled and both-sides wound coil that is configured by combining a plurality of single both-sides wound coils (100, 200). For the single both-sides wound coils (100, 200), a single both-sides wound coil having a state in which a leakage magnetic flux around a moving body of when two single both-sides wound coils are installed at an install position of the moving body does not exceed a predetermined value is selected. Then, a number of the single both-sides wound coils combined to configure the coupled and both-sides wound coil is set so that a value obtained by multiplying the power transfer capacity of the single both-sides wound coil by the number satisfies the power transfer capacity of the contactless power transfer transformer. The leakage magnetic flux can be reduced, and increase in capacity can easily be realized by the number of combination.


Patent
Technova | Date: 2015-04-08

At least one of a power transmission coil (10) and a power reception coil (20) is configured by a coupled and both-sides wound coil that is configured by combining a plurality of single both-sides wound coils (100, 200). For the single both-sides wound coils (100, 200), a single both-sides wound coil having a state in which a leakage magnetic flux around a moving body of when two single both-sides wound coils are installed at an install position of the moving body does not exceed a predetermined value is selected. Then, a number of the single both-sides wound coils combined to configure the coupled and both-sides wound coil is set so that a value obtained by multiplying the power transfer capacity of the single both-sides wound coil by the number satisfies the power transfer capacity of the contactless power transfer transformer. The leakage magnetic flux can be reduced, and increase in capacity can easily be realized by the number of combination.


Patent
Technova | Date: 2014-05-21

A SS-method bidirectional contactless power supply device is arranged such that at the time of G2V, a second power converter converts commercial alternating current to direct current, a first power converter converts the direct current to high-frequency alternating current, and a third power converter converts the high-frequency alternating current to the direct current to charge an electric storage device. On driving the first power converter with a constant voltage, the electric storage device is charged with a constant current. At the time of V2G, the third power converter converts the direct current to the high-frequency alternating current, the first power converter converts the high-frequency alternating current to the direct current, and the second power converter converts the direct current to the commercial alternating current. On driving the third power converter with the constant current, an output of the first power converter becomes the constant voltage.


A non-contact power feeding device feeds electric power in a non-contact manner from a transmission coil 31 installed on ground to a reception coil 32 of a mobile object stopping at a feeding position. The device includes, on the ground, an inverter 20 that outputs a high-frequency alternate current to the transmission coil 31, and a metal detecting-determining unit 40 that detects a metallic foreign object on the transmission coil. The metal detecting-determining unit 40 monitors the phase of a voltage and a current output from the inverter 20 to the transmission coil 31 and detects a metallic foreign object having entered during power feeding, based on a variation in the phase. The non-contact power feeding device can detect metallic foreign objects according to only measured data from the ground while the mobile object stops at the feeding position and can be simplified in structure.


Patent
Technova | Date: 2014-12-17

Provided is a bidirectional contactless power supply system having high-efficiency in terms of bidirectional power supply. The bidirectional contactless power supply system is equipped with: first, second, and third power converters (20, 10, 40) provided with functionality for converting direct current into alternating current, and functionality for converting alternating current into direct current; and a contactless power supply device (30) in which a primary-side circuit is connected to the power converter (20), and a secondary-side circuit is connected to the power converter (40). When power is supplied from the primary-side circuit to the secondary-side circuit, the power converter (10) carries out an operation for conversion into direct current, the power converter (20) carries out an operation for conversion into alternating current, and the power converter (40) carries out an operation for conversion into direct current. When power is supplied from the secondary-side circuit to the primary-side circuit, the power converter (40) carries out an operation for conversion into alternating current, the power converter (20) carries out an operation for conversion into direct current, and the power converter (10) carries out an operation for conversion into alternating current. The contactless power supply device (30) has a primary-side series capacitor (33), a secondary-side parallel capacitor (34), and a secondary-side series inductor (35), and carries out G2V and V2G operations with high efficiency.


Patent
Technova | Date: 2015-04-01

A coil main body includes: magnetic pole core members (141, 142) that constitute a pair of parallel magnetic pole portions; a winding wire core member that is orthogonal to the magnetic pole core members (141, 142) and connects one portion of each of the pair of parallel magnetic pole core members (141, 142) with each other; and an electric wire 150 that is wound around the winding wire core member. The coil main body is a contactless power transfer transformer that is fixed to a fixing plate 160 having a magnetic shield function and a heat dissipation function. The connecting position of the winding wire core member with respect to the magnetic pole core members (141, 142) is located toward one side from a center in the longitudinal direction of the magnetic pole core members (141, 142), and at least a space between the pair of the magnetic coil core members each containing an end portion longer in a distance to the connecting position is used as an arrangement space 70 of a component electrically connected to the electric wire 150. Since the coil main body and the component connected to the coil main body are housed in the contactless power transfer transformer, load on wiring at the time of installation is reduced.


Patent
Technova | Date: 2016-04-06

A SS-method bidirectional contactless power supply device in which resonance capacitors (53, 54) are connected in series to a primary-side coil (51) and a secondary-side coil (52), respectively, in which a first power converter (61) and a second power converter (62) are connected to a primary side and a third power converter (63) is connected to a secondary side. At the time of G2V, the second power converter (62) converts commercial alternating current to direct current, the first power converter (61) converts the direct current to high-frequency alternating current, and the third power converter (63) converts the high-frequency alternating current to the direct current to charge an electric storage device. At that time, when the first power converter (61) is driven with constant voltage, the electric storage device is charged with constant current. At the time of V2G, the third power converter (63) converts the direct current to the high-frequency alternating current, the first power converter (61) converts the high-frequency alternating current to the direct current, and the second power converter (62) converts the direct current to the commercial alternating current. At that time, when the third power converter (63) is driven with the constant current, an output of the first power converter (61) becomes the constant voltage.

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