JP2020058138A - Non-contact power supply device - Google Patents

Abstract

To reduce radio wave noise.SOLUTION: A non-contact power supply device includes: power transmission coils 22, 22 that are disposed in correspondence with each light source (LED) 34 and generate a corresponding magnetic field with AC power from an oscillator 24; power reception coils 30 and 30 that are disposed in correspondence with the respective power transmission coils 22, 22, and generate electric power in response to the magnetic field generated by the power transmission coils 22, 22; and a power supply circuit 32 that supplies the electric power from each power reception coil 30 to each corresponding light source (LED) 34. The power transmission coils 22, 22 are arranged adjacent each other in correspondence with a plurality of blow ports, respectively. The directions of the magnetic fields generated by adjacent power transmission coils 22, 22 are opposite directions to each other.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a non-contact power supply device for supplying electric power to a light source provided in an air outlet disposed adjacently.

  2. Description of the Related Art Conventionally, non-contact power supply that performs non-contact power transmission via electromagnetic coupling between a power transmission coil and a power reception coil has been known.

  For example, Patent Literature 1 discloses performing both power transmission and communication.

JP 2012-38887 A

  Here, when a pair of the power transmitting coil and the power receiving coil is arranged adjacent to each other, the magnetic field from the two adjacent power transmitting coils may influence the noise, and the noise may increase in a specific place away from the power transmitting coil. was there.

  The present invention is a non-contact power supply device that supplies electric power to light sources provided at a plurality of air outlets arranged adjacent to each other in a front part of a vehicle interior of a vehicle, and is provided corresponding to each light source. A power transmitting coil that generates a corresponding magnetic field by the AC power from the oscillator, a power receiving coil that is provided corresponding to each power transmitting coil, and generates power by receiving a magnetic field generated by the power transmitting coil, and A power supply circuit for supplying power to the corresponding light source, wherein each power transmission coil is arranged adjacent to each of the plurality of air outlets, and directions of magnetic fields generated between adjacent power transmission coils are opposite to each other. It is.

  ADVANTAGE OF THE INVENTION According to this invention, electric power can be supplied to the light source provided in two ventilation openings in a non-contact manner, and the radio wave noise by two adjacent power transmission coils can be reduced.

It is a schematic diagram which shows the structure of the vehicle interior front part where the power transmission coil of the electric power feeding apparatus which concerns on embodiment is installed. It is a figure showing composition of electric power transmission coils 22 and 22. FIG. 2 is a diagram illustrating a configuration of lights 20; FIG. 3 is a diagram illustrating a state of a magnetic field generated by power transmission coils 22;

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the present invention is not limited to the embodiment described here.

"overall structure"
FIG. 1 shows a configuration of a front part in a vehicle compartment where a power transmission coil of the contactless power supply device according to the embodiment is installed.

  An instrument panel 10 provided with a display unit such as a meter, an operation panel such as an air conditioner, an air outlet (register), and the like is provided at a front portion in the vehicle interior. Here, FIG. 1 shows a pair of adjacently arranged registers 12, 12 in the instrument panel 10. In this example, the pair of registers 12 and 12 have substantially the same shape, are arranged side by side in the horizontal direction, are each basically formed with a square hole, and air from a blower arranged on the back portion is transmitted from the registers 12 and 12 to the registers 12 and 12. Be blown out.

  Each of the registers 12 has a movable louver 14 arranged to partition a hole in order to control a blowing direction. In the drawings, the louvers 14 extending in the horizontal direction and the louvers 14 extending in the vertical direction are schematically shown, but a desired configuration may be appropriately adopted as required.

  Lights 20, 20 are provided at the centers of the registers 12, 12, respectively. The lights 20, 20 include an LED as a light source, for example, and emit light by electric power.

  The power transmission coils 22 are arranged so as to surround the periphery of the registers 12. The power transmission coils 22, 22 are installed on the back side of the instrument panel 10.

  The power transmission coils 22 and 22 are connected to each other, and one power transmission coil 22 is connected to the oscillator 24.

  Each of the lights 20 and 20 has a built-in power receiving coil and a power supply circuit, and power is supplied to the lights 20 and 20 by electromagnetically coupling the power transmitting coils 22 and the power receiving coil.

<Power supply configuration>
FIG. 2 shows the configuration of the power transmission coils 22. As described above, the oscillator 24 is connected to the right side (lower part) of the right power transmission coil 22, and one of the lines extends on the right side upward, on the upper side leftward, and on the left side downward, and then extends on the left side. The lower side extends in the left direction, the left side extends in the upper direction, the upper side extends in the right direction, and the right side extends in the lower direction, and terminates near the connection between the power transmission coils 22 and 22. The other line of the right power transmission coil 22 connected to the oscillator 24 extends to the left on the lower side of the right power transmission coil 22 and terminates near the connection between the two power transmission coils 22.

  Accordingly, the current supplied from the oscillator 24 flows through the pair of power transmission coils 22 and 22 as loops in opposite directions, and the magnetic field generated by the pair of power transmission coils 22 and 22 is directed in the opposite direction. That is, when the current from the oscillator 24 flows toward one line and flows from the other line to the oscillator 24, the current flows counterclockwise in the right power transmission coil 22 and escapes from the front surface to the rear surface of the power transmission coil 22. A magnetic field is formed, and a current flows clockwise in the left power transmission coil 22, so that a magnetic field that escapes from the back to the front of the power transmission coil 22 is formed.

  FIG. 3 shows the configuration of the lights 20 and 20. Both lights 20 have the same configuration. The light 20 includes a power receiving coil 30, a power supply circuit 32, and an LED. Due to the change in the magnetic field caused by the current flowing through the power transmission coil 22, an induced current flows through the power receiving coil 30 and is supplied to the power supply circuit 32. The power supply circuit 32 rectifies the alternating current from the power receiving coil 30, stores the rectified current in a capacitor or the like, and supplies this to the LED 34. Thus, the power from the power transmission coil 22 is supplied to the light 20 in a non-contact manner, and the LED 34 emits light. Therefore, by driving the oscillator 24, the light 20 emits light.

  The power receiving coils 30, 30 can be arbitrarily sized and arranged as long as they can be electromagnetically coupled to the power transmitting coils 22, 22.

  Here, as described above, the magnetic fields generated by the pair of power transmission coils 22 are directed in opposite directions. That is, the magnetic field changes according to the high frequency from the oscillator 24, but the phase is opposite (180 degrees) between those generated by the pair of power transmission coils 22, 22. Therefore, at a place (distant) away from the power transmission coils 22, 22, the two are weakened and the magnetic field is weakened. Therefore, it is possible to reduce the level of radio noise generated by a change in the magnetic field.

  Also, as shown in FIG. 4, in the area near the power transmission coils 22, 22, the directions of the magnetic fields from the power transmission coils 22, 22 are the same, and the two strengthen each other. For this reason, an effect of increasing power transmission / reception (power supply) efficiency can also be obtained.

10 instrument panel, 12 register, 14 louver, 20 lights, 22 power transmission coil, 24 oscillator, 30 power reception coil, 32 power supply circuit, 34 LED.

Claims (1)

A non-contact power supply device for supplying power to a light source provided in each of a plurality of air outlets arranged adjacent to each other in a front part of a vehicle interior of a vehicle,
A power transmission coil that is provided corresponding to each light source and generates a corresponding magnetic field by AC power from the oscillator;
A power receiving coil that is provided corresponding to each power transmitting coil and generates electric power by receiving a magnetic field generated by the power transmitting coil;
A power supply circuit for supplying power from each receiving coil to a corresponding light source,
Including
Each power transmission coil is disposed adjacent to the plurality of air outlets, and the directions of the magnetic fields generated by the adjacent power transmission coils are opposite to each other.
Non-contact power supply.

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