JP2012060797A - Non-contact power feeding device - Google Patents

Abstract

To provide a non-contact power feeding device capable of reducing the influence of magnetic flux on a sensor.
The contactless power supply device generates a induced current by receiving an alternating magnetic flux of a primary coil 61 and a primary side power transmission device 60 including a primary coil 61 that receives the supply of electric power and generates an alternating magnetic flux. The secondary side power receiving device 70 including the secondary coil 71 and the thermistor 63 for detecting the housing top wall 62 are included. A pot-type magnetic body 110 provided in the primary-side power transmission device 60 corresponding to the primary coil 61 and a flat-plate-type magnetic body 120 provided in the secondary-side power receiving device 70 corresponding to the secondary coil 71 are provided. Including. The pot-type magnetic body 110 is provided with a bulging portion 113 having holes 114 extending in the arrangement direction of the primary coil 61 and the secondary coil 71. A thermistor 63 that detects the temperature of the top wall 62 of the housing is provided in the hole 114.
[Selection] Figure 2

Description

  The present invention relates to a primary-side power transmission device including a primary coil that generates an alternating magnetic flux upon receipt of power supply, and a secondary-side power reception including a secondary coil that receives an alternating magnetic flux from the primary coil to generate an induced current. The present invention relates to a non-contact power feeding device including a device and a sensor for detecting a change in state.

As a non-contact power feeding device, for example, a device described in Patent Document 1 is known.
In the non-contact power feeding device of Patent Document 1, when a metal foreign object is sandwiched between the housing of the primary power transmission device and the housing of the secondary power receiving device, the high frequency alternating magnetic flux generated in the coil is caused. As a result, eddy current flows through the metal foreign object. For this reason, there exists a possibility that the temperature of a toothbrush and a charging device may become high too much with generation | occurrence | production of an eddy current.

  Therefore, in the non-contact power feeding device of the same document, it is determined whether or not the temperature of the primary power transmission device is excessively increased by a thermistor provided at the center of the primary coil. And when it determines with the temperature of the primary side power transmission apparatus detected by the thermistor being too high, control which interrupts charge of a secondary battery is performed.

JP 2009-273260 A

  In the non-contact power feeding device, since the thermistor is disposed at a location where the magnetic flux of the primary coil passes, an eddy current is generated in the thermistor. And when a big eddy current generate | occur | produces in a thermistor, since the temperature of the thermistor itself rises excessively, the temperature rise of the primary side power transmission apparatus resulting from a metal foreign material cannot be detected appropriately. Similarly, in a non-contact power supply apparatus in which other sensors (for example, magnetic sensors) are provided in addition to the thermistors, the sensors may not function properly due to the influence of magnetic flux.

  This invention is made | formed in view of such a situation, The objective is to provide the non-contact electric power feeder which can make small the influence of the magnetic flux with respect to a sensor.

Hereinafter, means for achieving the above object will be described.
The non-contact power feeding device of the present invention includes a primary power transmission device including a primary coil that generates an alternating magnetic flux by receiving power supply, and a secondary that generates an induced current by receiving the alternating magnetic flux of the primary coil. A secondary magnetic power receiving device including a coil; a sensor for detecting a change in state; a first magnetic body provided in the primary power transmission device corresponding to the primary coil; and the secondary coil Further including a second magnetic body provided in the secondary power receiving device, and at least one of the first magnetic body and the second magnetic body includes the primary coil and the secondary coil. A bulging portion having holes extending in the arrangement direction is provided, and the sensor is provided in the holes.

  -In this non-contact electric power feeder, the bulging part of the said 1st magnetic body is provided in the space of the center part of the said primary coil, and the said sensor is provided in the hole of this bulging part. Is preferred.

  -In this non-contact electric power feeder, the thickness of the part in which the said bulging part is provided in the said 1st magnetic body is made into primary side thickness, and the bulging part of the said 1st magnetic body in the said 2nd magnetic body When the thickness of the portion corresponding to is the secondary side thickness, the secondary side thickness is preferably smaller than the primary side thickness.

  In this non-contact power feeding device, a cylindrical shape is provided as the bulging portion of the first magnetic body, and the hole is provided in a central portion in the radial direction of the bulging portion. preferable.

-In this non-contact electric power feeder, it is preferable that a circular thing is provided as said primary coil and said secondary coil.
In this non-contact power feeding device, a pot type magnetic body is provided as at least one of the first magnetic body and the second magnetic body, and the pot type magnetic body is a circle surrounding the outer periphery of the corresponding coil. A columnar outer peripheral portion, the bulging portion disposed in the space of the central portion of the coil, and the outer peripheral portion and the bulging portion provided on the opposite side of the coil from the other coil. It is preferable that the bottom wall part to be connected is included.

-In this non-contact electric power feeder, it is preferable that a cylindrical thing is formed as said hole.
-In this non-contact electric power feeder, the bulging part of the said 1st magnetic body is provided in the space of the center part of the said primary coil, and the temperature of the said primary side power transmission apparatus is detected as said sensor Is preferably provided in the hole of the bulging portion.

  -In this non-contact electric power feeder, the bulging part of the said 1st magnetic body is provided in the space of the center part of the said primary coil, and the change of the state of the said secondary side power receiving device is detected as said sensor It is preferable that what to do is provided in the hole of the said bulging part.

  ADVANTAGE OF THE INVENTION According to this invention, the non-contact electric power feeder which can make small the influence of the magnetic flux with respect to a sensor can be provided.

The schematic diagram which shows typically the electric toothbrush and charging device which comprise the apparatus about the non-contact electric power feeder of 1st Embodiment of this invention. Sectional drawing which shows the cross-section of the electric power transmission part about the non-contact electric power feeder of the embodiment. About the non-contact electric power feeder of the embodiment, (a) is a top view which shows the planar structure of a pot type magnetic body, (b) is sectional drawing which shows the cross-section of a pot type magnetic body along A3-A3 line. The top view which shows the planar structure of a primary coil and a secondary coil about the non-contact electric power feeder of the embodiment. The circuit diagram which shows the structure of a primary side circuit and a secondary side circuit about the non-contact electric power feeder of the embodiment. Sectional drawing which shows the cross-section of the electric power transmission part about the non-contact electric power feeder of 2nd Embodiment of this invention. About the non-contact electric power feeder of the embodiment, (a) is a top view which shows the planar structure of an EER type magnetic body, (b) is sectional drawing which shows the cross-section of an EER type magnetic body which follows an A7-A7 line. Sectional drawing which shows the cross-section of the electric power transmission part about the non-contact electric power feeder of 3rd Embodiment of this invention. About the non-contact electric power feeder of the embodiment, (a) is a top view which shows the planar structure of an EE type magnetic body, (b) is sectional drawing which shows the cross-sectional structure of the EE type magnetic body in alignment with A9-A9 line. Sectional drawing which shows the cross-section of the electric power transmission part about the non-contact electric power feeder of 4th Embodiment of this invention. About the non-contact electric power feeder of the embodiment, (a) is a top view which shows the planar structure of an EI type magnetic body, (b) is sectional drawing which shows the cross-sectional structure of an EI type magnetic body which follows an A11-A11 line. The circuit diagram which shows the structure of the primary side circuit about the non-contact electric power supply of 5th Embodiment of this invention.

(First embodiment)
A first embodiment of the present invention will be described with reference to FIGS. In addition, in this embodiment, an example which actualized the non-contact electric power feeder of this invention as an electric toothbrush and its charging device is shown.

In FIG. 1, the whole structure of the non-contact electric power feeder 1 is shown.
The non-contact power feeding device 1 includes an electric toothbrush 10 for applying vibration to teeth and cleaning the teeth, and a charging device 20 for charging the electric toothbrush 10.

  The electric toothbrush 10 includes a gripping part 11 for a user to grip when cleaning teeth, and a cleaning part 13 that can be attached to and detached from the gripping part 11. As the casing of the gripping part 11 (hereinafter referred to as “toothbrush casing 14”), a non-magnetic and resinous one is used.

  The charging device 20 supplies alternating power to the charging device housing 21 on which the electric toothbrush 10 is mounted, the primary power transmission device 60 that receives alternating power and generates alternating magnetic flux, and the primary power transmission device 60. Primary side circuit 30 for performing the above. As the charging device casing 21, a non-magnetic and resinous one is used. The primary side power transmission device 60 and the primary side circuit 30 are each provided in the charging device casing 21.

  The gripping unit 11 receives the alternating magnetic flux of the primary power transmission device 60 and generates an induced current, and the secondary battery charged by receiving power from the secondary power reception device 70 15 and a secondary circuit 40 that supplies power from the secondary power receiving device 70 to the secondary battery 15. Moreover, the display part 12 which displays the vibration mode, charge condition, etc. of the electric toothbrush 10 and the actuator for vibrating the cleaning part 13 are included (not shown). The secondary power receiving device 70, the secondary circuit 40, the secondary battery 15, and the actuator are provided in the toothbrush housing 14, respectively.

  In the non-contact power feeding device 1, the primary side power transmitting device 60 and the secondary side power receiving device 70 constitute a power transmission unit 50 for transmitting power from the charging device 20 to the electric toothbrush 10. That is, the power transmission unit 50 is provided as a device for charging the secondary battery 15 by receiving power supplied from a commercial power source.

A detailed configuration of the power transmission unit 50 will be described with reference to FIG.
The primary-side power transmission device 60 receives a supply of electric power from the DC power source E1 (see FIG. 5) and generates a primary coil 61 that generates an alternating magnetic flux and a magnetic path of the magnetic flux generated in the primary coil 61. And a pot type magnetic body 110 as one magnetic body. Further, it includes a top wall of the charging device housing 21 (hereinafter referred to as “housing top wall 62”) and a thermistor 63 that detects the temperature of the housing top wall 62. DC power converted from commercial power AC power is supplied to the DC power supply E1.

  The secondary-side power receiving device 70 receives the alternating magnetic flux of the primary coil 61 and generates an induced current, and a flat plate as a second magnetic body that forms a magnetic path of the magnetic flux generated in the secondary coil 71. The mold magnetic body 120 and the bottom wall of the toothbrush housing 14 (hereinafter referred to as “housing bottom wall 72”) are included.

  Here, the dimensions of each part of the pot-type magnetic body 110 and the flat-plate-type magnetic body 120 are defined as follows. That is, the length from the base end portion 113A to the tip end portion 113B of the bulging portion 113 of the pot type magnetic body 110 is defined as a “bulging portion height HA”. Further, the length from the bottom surface 111A to the top surface 111B of the bottom wall portion 111 of the pot-type magnetic body 110 is defined as “bottom wall portion thickness HB”. Further, a length obtained by combining the bulging portion height HA and the bottom wall portion thickness HB is defined as “primary side thickness HC”. Further, the length from the bottom surface 121A to the top surface 121B of the portion corresponding to the bulging portion 113 (hereinafter referred to as “bulging portion corresponding portion 121”) in the flat magnetic body 120 is defined as the secondary thickness HD.

These dimensions are set so that the following relationship is established.
(A) The bulging part height HA is larger than the bottom wall part thickness HB.
(B) The bulging portion height HA is larger than the secondary side thickness HD.
(C) The bottom wall thickness HB is larger than the secondary thickness HD.
(D) The primary side thickness HC is larger than the secondary side thickness HD.

With reference to FIG. 3, the structure of the pot type magnetic body 110 will be described.
The pot-type magnetic body 110 includes a disc-shaped bottom wall portion 111, a columnar outer periphery portion 112 provided on the outer periphery of the bottom wall portion 111, and a columnar expansion portion provided in the center portion of the bottom wall portion 111. And a projecting portion 113.

  A circular hole 114 penetrating the bottom wall portion 111 and the bulging portion 113 in the longitudinal direction of the bulging portion 113 is provided in the central portion in the radial direction of the bulging portion 113. The bulging portion 113 and the hole 114 are provided along the arrangement direction of the primary coil 61 and the secondary coil 71. A thermistor 63 is provided at the tip of the hole 114.

  The thermistor 63 is bonded to the housing top wall 62 with silicon having high thermal conductivity. Further, the wiring of the thermistor 63 is passed through the hole 114 of the bulging portion 113 of the pot type magnetic body 110 and is drawn out of the pot type magnetic body 110 from the opening on the bottom wall portion 111 side of the hole 114. .

  The outer peripheral part 112 is provided as a part for bundling magnetic fluxes generated on the radially outer side of the primary coil 61. The bulging part 113 is provided as a part for bundling the magnetic flux generated on the radial center side of the primary coil 61.

  In the non-contact power feeding device 1, the electric toothbrush 10 is disposed on the charging device 20, that is, the top surface of the housing top wall 62 of the primary power transmission device 60 and the housing bottom of the secondary power receiving device 70. When the bottom surfaces of the walls 72 are in contact with each other, the secondary battery 15 is charged.

FIG. 4 shows a planar structure of the primary coil 61.
The primary coil 61 is formed as a disk-shaped coil in which conductive wires are wound concentrically. The inner end 61 </ b> A and the outer end 61 </ b> B of the primary coil 61 are connected to the primary circuit 30, respectively. A bulging portion 113 of the pot-type magnetic body 110 is provided in a circular space 61 </ b> C that is a space at the center of the primary coil 61.

  The end 61 </ b> A and the end 61 </ b> B of the primary coil 61 are drawn out of the pot-type magnetic body 110 through the bottom wall 111 of the pot-type magnetic body 110, respectively. Similar to the primary coil 61, the secondary coil 71 is also formed as a disk-shaped coil.

  With reference to FIG. 5, the structure of the primary side circuit 30 of the charging device 20 and the secondary side circuit 40 of the electric toothbrush 10 is demonstrated. In FIG. 5 and the description thereof, the primary coil 61 is indicated as “L1”, and the secondary coil 71 is indicated as “L2”.

  As the primary side circuit 30 of the charging device 20, a full-bridge composite resonance circuit that generates alternating power is used. The primary side circuit 30 includes a full bridge circuit 31 composed of a plurality of switching elements, a control circuit 33 that controls the switching elements, a thermistor 63, a fixed resistor R5, a DC power supply E1, and a primary coil L1. Including.

  The full bridge circuit 31 includes four switching elements composed of field effect transistors (FETs), that is, a first switching element F1, a second switching element F2, a third switching element F3, and a fourth switching element F4. Also included is a resonance circuit 32 for exchanging energy stored as an electric field inside the capacitor and energy stored as a magnetic field inside the coil between the capacitor and the coil.

  The resonant circuit 32 includes a primary coil L1 to which alternating power is supplied from each of the switching elements F1 to F4, a capacitor C1 provided in series with the primary coil L1, and a capacitor C2 provided in parallel with the primary coil L1. Including. Capacitor C1 and capacitor C2 each perform zero current switching.

  The capacitor C1 is provided as a circuit element for reducing the switching loss at the time of turning off each of the switching elements F1 to F4. The capacitor C2 is provided as a circuit element for reducing switching loss when the switching elements F1 to F4 are turned on.

  As each of the switching elements F1 to F4, those including internal diodes D1 to D4 are used. In FIG. 5, a portion including the built-in diodes D1 to D4 is expressed as an equivalent circuit.

  The first switching element F1 is connected in parallel to the first built-in diode D1. The second switching element F2 is connected in parallel to the second built-in diode D2. The third switching element F3 is connected in parallel to the third built-in diode D3. The fourth switching element F4 is connected in parallel to the fourth built-in diode D4.

  The control circuit 33 includes a microcomputer. Moreover, it connects with each switching element F1-F4 via gate resistance. That is, it is connected to the first switching element F1 via the first gate resistor R1. In addition, the second switching element F2 is connected via the second gate resistor R2. Moreover, it is connected to the third switching element F3 via the third gate resistor R3. In addition, the fourth switching element F4 is connected via the fourth gate resistor R4.

  As the secondary circuit 40 of the electric toothbrush 10, a bridge rectifier circuit that converts alternating power into DC power is used. The secondary side circuit 40 includes a full-wave rectifier circuit 41 that converts AC power received from the secondary coil L2 into DC power, a DC / DC converter 42 that steps down the DC power converted by the full-wave rectifier circuit 41, And a secondary battery 15 for storing electric power. Moreover, the capacitor | condenser C3 for taking the impedance matching of the primary side circuit 30 and the secondary side circuit 40, and the secondary coil L2 are included. The capacitor C3 is connected in parallel with the secondary coil L2.

  The full-wave rectifier circuit 41 includes four diodes, that is, a fifth diode D5, a sixth diode D6, a seventh diode D7, and an eighth diode D8. A smoothing capacitor C4 is connected in parallel to the output terminal P1 and the output terminal P2 of the full-wave rectifier circuit 41.

A power supply mode between the primary coil L1 and the secondary coil L2 will be described.
The control circuit 33 applies a control voltage to the switching elements F1 to F4 via the gate resistors R1 to R4, and switches the switching elements F1 to F4 on and off. That is, on / off of the first switching element F1 and the fourth switching element F4 and off / on of the second switching element F2 and the third switching element F3 are alternately switched according to the gate voltage. Accordingly, since alternating power is induced in the primary coil L1, a high-frequency alternating magnetic flux is generated in the primary coil L1.

  In the secondary coil L2, alternating power is generated by interlinking with the alternating magnetic flux of the primary coil L1. The alternating power is input to the full-wave rectifier circuit 41 via the capacitor C3 and is converted into DC power by being full-wave rectified. The converted DC power is stepped down by the DC / DC converter 42 and then supplied to the secondary battery 15 as a load. Thereby, the secondary battery 15 is charged.

  The control circuit 33 “charge interruption for stopping the transmission of power from the primary coil 61 to the secondary coil 71 when there is a metal foreign object between the primary side power transmitting device 60 and the secondary side power receiving device 70. Control. Hereinafter, a state where a metal foreign object is sandwiched between the primary coil L1 and the secondary coil L2 is referred to as an “abnormal state”, and a state where no metal foreign object is sandwiched is referred to as a “normal state”.

  In the abnormal state, an eddy current is generated in the metal foreign object due to the influence of high-frequency magnetic flux generated from the primary coil L1 and the secondary coil L2. And the temperature of the metal foreign material rises with generation | occurrence | production of an eddy current, and the temperature of the housing | casing top wall 62 and the housing | casing bottom wall 72 rises. As the temperature of the case top wall 62 rises, the temperature of the case top wall 62 detected by the thermistor 63 becomes higher than the normal state. Therefore, the voltage input to the control circuit 33 is also higher than the normal state voltage. It will be expensive. The voltage between the thermistor 63 and the fixed resistor R5 is input to the control circuit 33.

  The control circuit 33 calculates the temperature of the thermistor 63 based on the input voltage, and determines whether the calculated temperature (hereinafter, “estimated temperature T”) is equal to or higher than a preset reference temperature TX. When it is determined that the estimated temperature T is equal to or higher than the reference temperature TX, the supply of power to the primary coil L1 is interrupted. That is, the switching of the switching elements F1 to F4 based on the gate voltage is interrupted. Thereby, since the alternating power is not induced in the primary coil L1, the charging of the secondary battery 15 is interrupted. On the other hand, when it is determined that the estimated temperature T is lower than the reference temperature TX, the supply of power to the primary coil L1 is continued.

A setting mode of the reference temperature TX will be described.
In the non-contact power feeding device 1, the temperature of the thermistor 63 itself rises due to the thermistor 63 being affected by heat generated by the primary coil L1 and the like even in the normal state. For this reason, the temperature detected by the thermistor 63 in the abnormal state includes the temperature rise of the thermistor 63 itself in the normal state and the temperature rise of the housing top wall 62 due to the eddy current of the metal foreign matter. It will be included. That is, in order to appropriately determine the abnormal state based on the estimated temperature T, it is necessary to set the reference temperature TX in consideration of the temperature rise of the thermistor 63 in the normal state.

  Therefore, the maximum temperature of the thermistor 63 predicted to be reached in the normal state or a temperature corresponding thereto is stored in advance in the memory of the control circuit 33 as the reference temperature TX. Thereby, the frequency with which it is determined that the non-contact power feeding device 1 is in an abnormal state based on the increase in the estimated temperature T is reduced even though no metal foreign matter is sandwiched.

According to the present embodiment, the following effects can be obtained.
(1) The non-contact power feeding device 1 is provided in the pot-type magnetic body 110 provided in the primary side power transmission device 60 corresponding to the primary coil 61 and in the secondary side power receiving device 70 corresponding to the secondary coil 71. And a flat plate type magnetic body 120. The bulging portion 113 of the pot-type magnetic body 110 is provided with a hole 114 extending in the arrangement direction of the primary coil 61 and the secondary coil 71. Further, the thermistor 63 is provided in the hole 114.

  According to this configuration, since the magnetic flux generated on the center side of the primary coil 61 passes through the wall portion of the bulging portion 113, that is, the magnetic path of the magnetic flux is formed by the wall portion of the bulging portion 113. Magnetic flux generated at the center side of the next coil 61 is less likely to interlink with the thermistor 63. For this reason, the influence which the magnetic flux of the primary coil 61 has on the thermistor 63 can be reduced.

  (2) According to the configuration of (1) above, since the influence of the magnetic flux of the primary coil 61 on the thermistor 63 is reduced, eddy current is unlikely to occur in the thermistor 63. Thereby, since the temperature rise of the thermistor 63 itself is suppressed, the thermistor 63 can detect the minute temperature rise resulting from a metal foreign material.

  More specifically, since the influence of the magnetic flux of the primary coil 61 on the thermistor 63 is reduced, the thermistor 63 itself is in a normal state in which no metal foreign matter is sandwiched between the primary coil 61 and the secondary coil 71. The degree of temperature increase is reduced. For this reason, it becomes possible to set the reference temperature TX used for determination of charge interruption control to a smaller value.

  Thereby, even when the degree of increase in the estimated temperature T is small, a minute metal foreign object is sandwiched between the charging device casing 21 and the toothbrush casing 14 due to the comparison between the estimated temperature T and the reference temperature TX. It can be detected appropriately.

  (3) In the non-contact power feeding device 1, the wiring of the thermistor 63 is passed through the hole 114 of the bulging portion 113 of the pot type magnetic body 110, and the wiring is routed from the opening on the bottom wall 111 side of the hole 114. 110 is pulled out to the outside.

  According to this configuration, the wiring of the thermistor 63 is less likely to interlink with the magnetic flux of the primary coil 61, so that the influence of the magnetic flux of the primary coil 61 on the thermistor 63 can be reduced. Moreover, the temperature rise degree of the thermistor 63 itself can be made small.

  (4) In the non-contact power feeding device 1, when the estimated temperature T calculated based on the output of the thermistor 63 is equal to or higher than a preset reference temperature TX, a metal is interposed between the charging device housing 21 and the toothbrush housing 14. It is determined that the foreign object is in an abnormal state. In addition, the reference temperature TX is set in advance in consideration of the temperature rise of the thermistor 63 in the normal state where no metal foreign matter is sandwiched.

  In this configuration, the temperature rise of the thermistor 63 itself is reduced by the configurations of (1) and (3) above, and the reference temperature TX is set in consideration of the temperature rise of the thermistor 63 itself. . As a result, the reference temperature TX can be set in advance as a smaller value, so that a minute temperature rise of the housing top wall 62 due to the metallic foreign object can be detected.

  (5) In the non-contact power feeding device 1, the bulging portion 113 of the pot-type magnetic body 110 is provided in the circular space 61 </ b> C that is the space of the central portion of the primary coil 61, and the thermistor is provided in the bulging portion 113. 63 is provided.

  Since the primary coil 61 is supplied with electric power based on the commercial power supply, the magnetic flux generated in the primary coil 61 has a higher magnetic flux density than the magnetic flux generated in the secondary coil 71. For this reason, when a metal foreign object is sandwiched between the charging device casing 21 and the toothbrush casing 14, the temperature of the metal foreign object is higher on the primary coil 61 side than on the secondary coil 71 side.

  Since the thermistor 63 is provided on the primary coil 61 side according to the above configuration of the non-contact power feeding device 1, compared to the configuration in which the thermistor 63 is provided on the secondary coil 71 side (secondary power receiving device 70). The rise in the temperature of the metal foreign object can be detected more accurately.

  (6) According to the configuration in which the thermistor 63 is provided on the secondary coil 71 side, in order to perform control based on the output of the thermistor 63, the output of the thermistor 63 is changed from the secondary power receiving device 70 to the primary power transmitting device 60. Need to be transmitted to the control circuit 33.

  In this regard, according to the configuration of (5) of the non-contact power feeding device 1, the output of the thermistor 63 is transmitted directly to the control circuit 33 in the primary power transmission device 60, so the configuration of the charging device 20 is It can suppress becoming complicated.

(7) In the non-contact power feeding device 1, the primary side thickness HC is larger than the secondary side thickness HD.
According to this configuration, compared to the case where the secondary side thickness HD is equal to or larger than the primary side thickness HC, the magnetic flux passing through the bulging portion corresponding portion 121 in the secondary side power receiving device 70 is reduced. Density decreases. Thereby, since the magnetic flux generated in the secondary coil 71 is less likely to be linked to the thermistor 63, the influence of the magnetic flux of the secondary coil 71 on the thermistor 63 can be reduced. Moreover, the temperature rise degree of the thermistor 63 itself can be made small.

  (8) In the non-contact power feeding device 1, a cylindrical shape is provided as the bulging portion 113 of the pot-type magnetic body 110, and a hole 114 is provided in the radial center portion of the bulging portion 113. ing. The thermistor 63 is provided in the hole 114.

  According to this configuration, since the magnetic flux generated on the center side of the primary coil 61 passes through the cylindrical bulging portion 113, the magnetic flux is larger than that in the case where a portion other than the cylindrical shape is provided as the bulging portion 113. Can be prevented from concentrating on a part.

  (9) The density of the magnetic flux generated on the center side of the primary coil 61 is higher than the density of the magnetic flux generated on the radially outer side of the primary coil 61. According to the configuration of (8) above, since the thermistor 63 is provided on the center side of the primary coil 61 having a high magnetic flux density, a rise in the temperature of the housing top wall 62 caused by metal foreign matter can be detected more appropriately. can do.

(10) In the non-contact power feeding device 1, circular primary coils 61 and secondary coils 71 are provided.
When at least one of the primary coil 61 and the secondary coil 71 has a shape different from a circular shape, the transmission efficiency of magnetic flux is improved when the rotation angle of the electric toothbrush 10 with respect to the charging device 20 is set to the reference angle. Get higher. For this reason, the transmission efficiency of magnetic flux greatly decreases due to the relative rotational position shift when the electric toothbrush 10 is placed on the charging device 20.

  In this regard, according to the configuration of the non-contact power feeding device 1, the relative relationship between the primary coil 61 and the secondary coil 71 is set regardless of the rotation angle of the electric toothbrush 10 with respect to the charging device 20. Are substantially the same. For this reason, it can suppress that charging efficiency falls resulting from the method of arrangement | positioning of the electric toothbrush 10 with respect to the charging device 20. FIG.

  (11) In the non-contact power feeding device 1, the pot-type magnetic body 110 includes a columnar outer peripheral portion 112 that surrounds the outer periphery of the primary coil 61 and a bulging portion 113 that is disposed in the circular space 61 </ b> C of the coil 61. . According to this configuration, since the bulging portion 113 is provided on the center side of the primary coil 61 having a high magnetic flux density, the transmission efficiency of the magnetic flux from the primary coil 61 to the secondary coil 71 can be increased.

  (12) When the shape of the magnetic material forming the magnetic path is different from the cylindrical shape, that is, when having an edge like a quadrangular prism-shaped magnetic material, the magnetic flux concentrates on the edge portion, so that the primary side power transmission device There is a possibility that the transmission efficiency of the magnetic flux from 60 to the secondary power receiving device 70 may decrease.

  In this respect, in the non-contact power supply device 1, a cylindrical shape is provided as the hole 114 of the bulging portion 113. Thereby, it can suppress that magnetic flux concentrates on a part. That is, it is possible to suppress a decrease in the transmission efficiency of magnetic flux from the primary side power transmission device 60 to the secondary side power reception device 70.

  (13) In the non-contact power feeding device 1, the bulging portion 113 of the pot type magnetic body 110 is provided in the circular space 61 </ b> C of the primary coil 61, and the temperature of the housing top wall 62 is detected as the thermistor 63. Things are provided in the holes 114. According to this configuration, since the thermistor 63 is provided as a sensor for detecting temperature, an increase in cost can be suppressed.

(Second Embodiment)
A second embodiment of the present invention will be described with reference to FIGS.
The contactless power supply device 1 of the present embodiment is configured as a part of the contactless power supply device 1 of the first embodiment changed as follows. That is, in the non-contact power feeding device 1 of this embodiment, an EER type magnetic body 130 is provided instead of the pot type magnetic body 110 of the first embodiment. Further, instead of the flat plate type magnetic body 120, an EER type magnetic body 130 is provided.

  Details of the changed part will be described below. In addition, since the same structure as 1st Embodiment is employ | adopted about the other point, the same code | symbol is attached | subjected about a common structure, and the one part or all part of the description is abbreviate | omitted suitably.

A detailed configuration of the power transmission unit 50 will be described with reference to FIG.
The primary-side power transmission device 60 receives a supply of electric power from the DC power source E1 (see FIG. 5) and generates a primary coil 61 that generates an alternating magnetic flux and a magnetic path of the magnetic flux generated in the primary coil 61. EER type magnetic body 130 as one magnetic body. Moreover, the housing | casing top wall 62 as a top wall of the charging device housing | casing 21 and the thermistor 63 which detects the temperature of the housing | casing top wall 62 are included.

  The secondary power receiving device 70 receives an alternating magnetic flux of the primary coil 61 and generates an induced current, and an EER as a second magnetic body that forms a magnetic path of the magnetic flux generated in the secondary coil 71. A mold magnetic body 130 and a housing bottom wall 72 as a bottom wall of the toothbrush housing 14 are included.

With reference to FIG. 7, the structure of the EER type magnetic body 130 will be described.
The EER type magnetic body 130 is provided at a rectangular bottom wall portion 131, a pair of rectangular outer wall portions 132 provided at both longitudinal ends of the bottom wall portion 131, and a central portion of the bottom wall portion 131. And a cylindrical bulging portion 133. The surface of each outer wall 132 on the bulging portion 133 side is formed as a curved surface.

  A hole 134 that penetrates the bottom wall portion 131 and the bulging portion 133 in the longitudinal direction of the bulging portion 133 is provided in the central portion in the radial direction of the bulging portion 133. The bulging portion 133 and the hole 134 are provided along the arrangement direction of the primary coil 61 and the secondary coil 71. A thermistor 63 is provided at the tip of the hole 134.

  Each outer wall part 132 is provided as a part for bundling magnetic fluxes generated on the radially outer side of the primary coil 61. The bulging part 133 is provided as a part for bundling the magnetic flux generated on the radial center side of the primary coil 61.

  As the EER type magnetic body 130 of the secondary side power receiving device 70, the substantially same structure as the EER type magnetic body 130 of the primary side power transmitting device 60 is adopted except that the structure of the bulging portion is different. In other words, the EER type magnetic body 130 of the secondary power receiving device 70 is provided with a bulging portion 135 having a solid structure in which no hole is formed.

  According to the present embodiment, the effect (1) of the first embodiment, that is, the effect that the influence of the magnetic flux on the sensor can be reduced, and (2) to (9) and (11) to (13) In addition to the effect according to the effect (14), the following effect (14) is obtained.

  (14) In the non-contact power feeding device 1, the EER type magnetic body 130 includes a rectangular outer wall portion 132 located on the outer periphery of the primary coil 61 and a bulging portion 133 disposed in the circular space 61 </ b> C of the coil 61. Including. According to this configuration, since the bulging portion 133 is provided on the center side of the primary coil 61 having a high magnetic flux density, the transmission efficiency of the magnetic flux from the primary coil 61 to the secondary coil 71 can be increased.

(Third embodiment)
A third embodiment of the present invention will be described with reference to FIGS.
The contactless power supply device 1 of the present embodiment is configured as a part of the contactless power supply device 1 of the first embodiment changed as follows. That is, in the contactless power supply device 1 of the present embodiment, an EE type magnetic body 140 is provided instead of the pot type magnetic body 110 of the first embodiment. Further, an EE type magnetic body 140 is provided in place of the flat plate type magnetic body 120.

  Details of the changed part will be described below. In addition, since the same structure as 1st Embodiment is employ | adopted about the other point, the same code | symbol is attached | subjected about a common structure, and the one part or all part of the description is abbreviate | omitted suitably.

A detailed configuration of the power transmission unit 50 will be described with reference to FIG.
The primary-side power transmission device 60 receives a supply of electric power from the DC power source E1 (see FIG. 5) and generates a primary coil 61 that generates an alternating magnetic flux and a magnetic path of the magnetic flux generated in the primary coil 61. EE type magnetic body 140 as one magnetic body. Moreover, the housing | casing top wall 62 as a top wall of the charging device housing | casing 21 and the thermistor 63 which detects the temperature of the housing | casing top wall 62 are included.

  The secondary power receiving device 70 receives an alternating magnetic flux of the primary coil 61 and generates an induced current, and an EE as a second magnetic body that forms a magnetic path of the magnetic flux generated in the secondary coil 71. The mold magnetic body 140 and a housing bottom wall 72 as a bottom wall of the toothbrush housing 14 are included.

The structure of the EE type magnetic body 140 will be described with reference to FIG.
The EE type magnetic body 140 is provided in a rectangular bottom wall portion 141, a pair of rectangular outer wall portions 142 provided at both ends in the longitudinal direction of the bottom wall portion 141, and a central portion of the bottom wall portion 141. And a rectangular bulging portion 143.

  A central portion in the radial direction of the bulging portion 143 is provided with a hole 144 that penetrates the bottom wall portion 141 and the bulging portion 143 in the longitudinal direction of the bulging portion 143. The bulging portion 143 and the hole 144 are provided along the arrangement direction of the primary coil 61 and the secondary coil 71. A thermistor 63 is provided at the tip of the hole 144.

  Each outer wall part 142 is provided as a part for bundling magnetic flux generated on the radially outer side of the primary coil 61. The bulging part 143 is provided as a part for bundling the magnetic flux generated on the radial center side of the primary coil 61.

  As the EE type magnetic body 140 of the secondary side power receiving device 70, substantially the same structure as that of the EE type magnetic body 140 of the primary side power transmission device 60 is adopted except that the structure of the bulging portion is different. That is, the EE type magnetic body 140 of the secondary side power receiving device 70 is provided with a bulging portion 145 having a solid structure in which no hole is formed.

  According to the present embodiment, the effect (1) of the first embodiment, that is, the effect that the influence of the magnetic flux on the sensor can be reduced, and (2) to (6) and (11) and (13) In addition to the effect according to the effect (15), the following effect (15) is obtained.

(15) In the non-contact power feeding device 1, the EE type magnetic body 140 includes a rectangular outer wall portion 142 positioned on the outer periphery of the primary coil 61 and a bulging portion 143 disposed in the circular space 61 </ b> C of the coil 61. Including. According to this configuration, since the bulging portion 143 is provided on the center side of the primary coil 61 having a high magnetic flux density, the transmission efficiency of magnetic flux from the primary coil 61 to the secondary coil 71 can be increased.
(Fourth embodiment)
A fourth embodiment of the present invention will be described with reference to FIGS. 10 and 11.

  The contactless power supply device 1 of the present embodiment is configured as a part of the contactless power supply device 1 of the first embodiment changed as follows. That is, in the non-contact power feeding device 1 of this embodiment, an EI type magnetic body 150 is provided instead of the pot type magnetic body 110 of the first embodiment. Further, an EI type magnetic body 150 is provided in place of the flat plate type magnetic body 120.

  Details of the changed part will be described below. In addition, since the same structure as 1st Embodiment is employ | adopted about the other point, the same code | symbol is attached | subjected about a common structure, and the one part or all part of the description is abbreviate | omitted suitably.

A detailed configuration of the power transmission unit 50 will be described with reference to FIG.
The primary-side power transmission device 60 receives a supply of electric power from the DC power source E1 (see FIG. 5) and generates a primary coil 61 that generates an alternating magnetic flux and a magnetic path of the magnetic flux generated in the primary coil 61. EI type magnetic body 150 as one magnetic body. Moreover, the housing | casing top wall 62 as a top wall of the charging device housing | casing 21 and the thermistor 63 which detects the temperature of the housing | casing top wall 62 are included.

  The secondary power receiving device 70 receives the alternating magnetic flux of the primary coil 61, generates a secondary coil 71, and EI as a second magnetic body that forms a magnetic path of the magnetic flux generated in the secondary coil 71. A mold magnetic body 150 and a housing bottom wall 72 as a bottom wall of the toothbrush housing 14 are included.

The structure of the EI type magnetic body 150 will be described with reference to FIG.
The EI type magnetic body 150 is provided in a rectangular bottom wall portion 151, a pair of rectangular outer wall portions 152 provided at both longitudinal ends of the bottom wall portion 151, and a central portion of the bottom wall portion 151. And a rectangular bulging portion 153. The structure of the EI type magnetic body 150 is equivalent to a structure in which the bulge height HA is larger than that of the EE type magnetic body 140, and the other parts are substantially the same as those of the EE type magnetic body 140. Has been.

  A central portion in the radial direction of the bulging portion 153 is provided with a hole 154 that penetrates the bottom wall portion 151 and the bulging portion 153 in the longitudinal direction of the bulging portion 153. The bulging portion 153 and the hole 154 are provided along the arrangement direction of the primary coil 61 and the secondary coil 71. A thermistor 63 is provided at the tip of the hole 154.

  Each outer wall portion 152 is provided as a portion for bundling magnetic flux generated on the radially outer side of the primary coil 61. The bulging portion 153 is provided as a portion for bundling magnetic flux generated on the radial center side of the primary coil 61.

  As the EI type magnetic body 150 of the secondary side power receiving device 70, the substantially same structure as the EI type magnetic body 150 of the primary side power transmitting device 60 is adopted except that the structure of the bulging portion is different. That is, the EI type magnetic body 150 of the secondary power receiving device 70 is provided with a bulging portion 155 having a solid structure in which no hole is formed.

  According to the present embodiment, the effect (1) of the first embodiment, that is, the effect that the influence of the magnetic flux on the sensor can be reduced, and (2) to (6) and (11) and (13) The effect according to the effect is obtained.

  (16) In the non-contact power feeding device 1, the EI type magnetic body 150 includes a rectangular outer wall portion 152 located on the outer periphery of the primary coil 61 and a bulging portion 153 disposed in the circular space 61 </ b> C of the coil 61. Including. According to this configuration, since the bulging portion 153 is provided on the center side of the primary coil 61 having a high magnetic flux density, the transmission efficiency of magnetic flux from the primary coil 61 to the secondary coil 71 can be increased.

(Fifth embodiment)
A fifth embodiment of the present invention will be described with reference to FIG.
The contactless power supply device 1 of the present embodiment is configured as a part of the contactless power supply device 1 of the first embodiment changed as follows.

  The non-contact power feeding device 1 according to the first embodiment uses the power to the primary coil L1 based on the comparison result between the temperature (estimated temperature T) of the housing top wall 62 detected by the thermistor 63 and the reference temperature TX. The supply mode is controlled.

  In contrast, the contactless power supply device 1 of the present embodiment compares the temperature of the housing top wall 62 detected by the thermistor 63 with the temperature of the circuit board of the primary power transmission device 60 detected by the thermistor 64. Based on the result, the supply mode of power to the primary coil L1 is controlled.

  Details of the changed part will be described below. In addition, since the same structure as 1st Embodiment is employ | adopted about the other point, the same code | symbol is attached | subjected about a common structure, and the one part or all part of the description is abbreviate | omitted suitably.

  As shown in FIG. 12, the thermistor 64 and the fixed resistor R <b> 6 are provided in the primary-side power transmission device 60 as elements for detecting the temperature of the circuit board. The control circuit 33 receives a voltage applied to the thermistor 63 (hereinafter referred to as “first voltage VS1”) and a voltage applied to the thermistor 64 (hereinafter referred to as “second voltage VS2”).

  The control circuit 33 calculates an estimated temperature T as the temperature of the thermistor 63 based on the first voltage VS1. Further, the temperature of the thermistor 64 (hereinafter, “substrate estimated temperature TB”) is calculated based on the second voltage VS2. When it is determined that the difference between the estimated temperature T and the estimated substrate temperature TB is equal to or greater than the reference temperature difference TZ, the supply of power to the primary coil L1 is interrupted. That is, the switching of the switching elements F1 to F4 based on the gate voltage is interrupted. Thereby, since the alternating power is not induced in the primary coil L1, the charging of the secondary battery 15 is interrupted. On the other hand, when it is determined that the difference between the estimated temperature T and the estimated substrate temperature TB is less than the reference temperature difference TZ, the supply of power to the primary coil L1 is continued.

  In the normal state, the first voltage VS1 and the second voltage VS2 each show a similar change tendency according to a change in the atmospheric temperature or the like. That is, in the normal state, the difference between the first voltage VS1 and the second voltage VS2 is maintained at a substantially constant magnitude.

  In the abnormal state, the first voltage VS <b> 1 changes according to the temperature rise of the housing top wall 62. On the other hand, since the thermistor 64 is provided at a site away from the housing top wall 62, the change tendency of the second voltage VS2 with respect to the temperature rise of the housing top wall 62 is the first change with respect to the temperature rise of the housing top wall 62. This is different from the change tendency of the voltage VS1. Basically, the first voltage VS1 increases as the temperature of the housing top wall 62 increases, while the second voltage VS2 tends not to change substantially.

  For this reason, whether the state of the non-contact power feeding device 1 is in an abnormal state or a normal state depends on the difference between the first voltage VS1 and the second voltage VS2, that is, the difference between the estimated temperature T and the estimated substrate temperature TB. It can be determined based on. Therefore, the control circuit 33 controls the supply mode of power to the primary coil L1 based on the difference between the estimated temperature T and the substrate estimated temperature TB as described above.

  According to the present embodiment, the effect (1) of the first embodiment, that is, the effect that the influence of the magnetic flux on the sensor can be reduced, and the effects according to the effects (2) to (13) are obtained. It is done.

(Other embodiments)
In addition, the embodiment of the present invention is not limited to the embodiment exemplified in each of the above-described embodiments, and the embodiment can be modified as shown below, for example. The following modifications are not applied only to the above embodiments, and different modifications can be combined with each other.

  In the first embodiment, the secondary side thickness HD is smaller than the bulge portion height HA and the bottom wall portion thickness HB, but the secondary side thickness HD is set to the bulge portion height HA and the bottom wall. It is also possible to make it larger than at least one of the part thicknesses HB. Also in this case, when the primary side thickness HC is larger than the secondary side thickness HD, the effect (7) of the first embodiment can be obtained.

  In the first embodiment, the secondary side thickness HD is made smaller than the primary side thickness HC, but the secondary side thickness HD can be made larger than the primary side thickness HC. In this case, the same effect as that of the embodiment is obtained except that the effect (7) of the first embodiment is not obtained.

  -In the said 1st Embodiment, although the circular hole 114 is provided in the bulging part 113, the shape of the hole 114 is not restricted circular. For example, a rectangular hole can be formed instead of the circular hole.

In the first embodiment, a bulging portion that protrudes toward the primary power transmission device 60 can be provided in the bulging portion corresponding portion 121 of the flat magnetic body 120.
In the first embodiment, the control circuit 33 calculates the estimated temperature T as the temperature of the housing top wall 62, and the electric power to the primary coil L1 based on the comparison result between the estimated temperature T and the reference temperature TX. However, this can be changed as follows.

  That is, the control circuit 33 interrupts the supply of power to the primary coil L1 when the voltage applied to the thermistor 63 is equal to or higher than the reference voltage, that is, when an abnormal state is estimated. On the other hand, when the voltage applied to the thermistor 63 is less than the reference voltage, that is, when the normal state is estimated, the supply of power to the primary coil L1 is continued.

  In the fifth embodiment, the control circuit 33 calculates the temperature of the housing top wall 62 and the circuit board, and controls the power supply mode to the primary coil L1 based on the comparison result. This can be changed as follows.

  That is, the first voltage VS1 and the second voltage VS2 are input to a comparator provided separately from the control circuit 33. The comparator outputs an abnormal output voltage VC to the control circuit 33 when the difference between the first voltage VS1 and the second voltage VS2 is equal to or greater than a determination value. On the other hand, when the difference between the first voltage VS1 and the second voltage VS2 is less than the determination value, the normal output voltage VD larger than the abnormal output voltage VC is output to the control circuit 33.

  The control circuit 33 interrupts the supply of power to the primary coil L1 when the output voltage of the comparator is the abnormal output voltage VC, that is, when an abnormal state is estimated. On the other hand, when the output voltage of the comparator is the normal output voltage VD, that is, when it is estimated that the normal state, the supply of power to the primary coil L1 is continued.

  In each of the above embodiments, the type of the first magnetic body of the primary side power transmission device 60 can be changed as follows. That is, in place of the first magnetic body of each embodiment, any one of the pot type magnetic body 110, the EER type magnetic body 130, the EE type magnetic body 140, the EI type magnetic body 150, the EF magnetic body, and the ETD magnetic body is used. You can also. When an EF magnetic body or an ETD magnetic body is used, a hole for arranging a sensor is provided in the bulging portion as in the first magnetic body of each embodiment.

  Each of the magnetic bodies exemplified above is an example of a magnetic body that can be employed as the first magnetic body, and a magnetic body of another shape can be provided as the first magnetic body. In short, as long as it is a magnetic body having a bulging portion and a hole for arranging a sensor is formed in the bulging portion, the shape of the first magnetic body can be changed as appropriate.

  In each embodiment described above, the type of the second magnetic body of the secondary power receiving device 70 can be changed as follows. That is, instead of the second magnetic body of each embodiment, the pot type magnetic body 110, the flat plate type magnetic body 120, the EER type magnetic body 130, the EE type magnetic body 140, the EI type magnetic body 150, the EF magnetic body, and the ETD magnetic body. Any of the bodies can also be used. Further, the pot-type magnetic body 110, the EER-type magnetic body 130, the EE-type magnetic body 140, and the EI-type magnetic body 150 can be used without the bulging portion hole. Moreover, when using an EF magnetic body or an ETD magnetic body, a hole can be provided in the bulging portion as in the case of the first magnetic body.

  Each magnetic body illustrated above is an example of a magnetic body that can be employed as the second magnetic body, and a magnetic body having another shape can be provided as the second magnetic body. In short, in the configuration in which the sensor is provided only in the former of the primary-side power transmitting device 60 and the secondary-side power receiving device 70, the shape of the second magnetic body can be changed as appropriate. Further, in the configuration in which the sensor is provided in the secondary power receiving device 70, if the magnetic body has a bulging portion and the hole for arranging the sensor is formed in the bulging portion, The shape as a 2 magnetic body can be changed suitably.

  -In the said 2nd-4th embodiment, except the point by which the hole is not formed in the bulging part, the same shape magnetic body was provided in each of the primary side power transmission apparatus 60 and the secondary side power receiving apparatus 70. However, it is also possible to provide magnetic devices having different shapes from each other with or without holes. In the second to fourth embodiments, in the case where the secondary power receiving device 70 is provided with the flat plate-type magnetic body 120, the primary side thickness HC is made larger than the secondary side thickness HD. The effect according to the effect of 7) is obtained.

  In each of the above embodiments, the thermistor 63 is provided in the primary power transmission device 60, but the thermistor 63 may be provided in the secondary power reception device 70 instead of or in addition to this. In this case, as the magnetic body of the secondary power receiving device 70, one having a bulging portion, for example, any one of the pot type magnetic body 110, the EER type magnetic body 130, the EE type magnetic body 140, and the EI type magnetic body 150 is used. Is preferred. Further, by providing the thermistor in the hole of the bulging portion, the effect equivalent to the effect of each of the above embodiments can be obtained for the thermistor provided in the secondary power receiving device 70.

  In each of the above embodiments, the configuration of the non-contact power feeding device 1 including the thermistor 63 as a sensor for detecting a change in state is illustrated, but another sensor may be provided instead of or in addition to the thermistor 63. An example in that case is shown in the following (A) and (B).

  (A) A Hall element that detects magnetic flux is provided in the primary-side power transmission device 60. Further, a magnet is provided at a position corresponding to the Hall element in the secondary power receiving device 70. According to this configuration, since the output voltage of the Hall element changes according to the magnetic flux of the magnet, it is possible to detect that the electric toothbrush 10 is placed on the charging device 20 based on the output voltage of the Hall element. Therefore, by performing the following control by the control circuit 33, it is possible to appropriately control the timing of starting and ending charging of the electric toothbrush 10.

  When the control circuit 33 determines that the output voltage of the Hall element is larger than the determination value, that is, when it is predicted that the electric toothbrush 10 is placed on the charging device 20, Start charging. On the other hand, when it is determined that the output voltage of the Hall element is equal to or lower than the determination value, that is, when it is predicted that there is no electric toothbrush 10 on the charging device 20, the charging of the secondary battery 15 by the power transmission unit 50 is terminated.

  (B) A primary side photodiode as a light receiving element is provided in the primary side power transmission device 60. In addition, a secondary side photodiode as a light emitting element is provided in the secondary side power receiving device 70. According to this configuration, since the output voltage of the primary side photodiode changes according to the amount of light received from the secondary side photodiode, it is determined whether the electric toothbrush 10 is placed on the charging device 20 or not. Detection is possible based on the output voltage of the side photodiode. Therefore, by performing the following control by the control circuit 33, it is possible to appropriately control the timing of starting and ending charging of the electric toothbrush 10.

  When the control circuit 33 determines that the output voltage of the primary side photodiode is larger than the determination value, that is, when it is predicted that the electric toothbrush 10 is placed on the charging device 20, the secondary by the power transmission unit 50. Charging of the battery 15 is started. On the other hand, when it is determined that the output voltage of the primary side photodiode is equal to or lower than the determination value, that is, when it is predicted that there is no electric toothbrush 10 on the charging device 20, the charging of the secondary battery 15 by the power transmission unit 50 is finished. To do.

  In each of the above embodiments, the full bridge circuit 31 including the switching elements F1 to F4 is adopted, but the configuration of the full bridge circuit 31 is not limited to this. In short, as long as the alternating power can be induced in the primary coil L1 of the resonance circuit 32, for example, a full bridge circuit in which the switching elements F1 to F4 are omitted can be adopted.

  In each of the above embodiments, the resonance circuit 32 includes the primary coil L1 at the midpoint of the full bridge circuit 31 including the switching elements F1 to F4. However, as long as it can generate alternating power. It can replace with the resonance circuit 32 of each embodiment, and can also employ | adopt.

  In each of the above embodiments, the field effect transistors are used as the switching elements F1 to F4, but other elements can be used as long as they are switching elements that generate alternating power.

  In each of the above embodiments, an example in which the present invention is embodied as the non-contact power feeding device 1 including the electric toothbrush 10 and the charging device 20 has been shown, but the present invention is used as a non-contact power feeding device including another electric device and the charging device. The invention can also be embodied. Examples of other electric devices include a mobile phone, a cordless phone, an electric razor, a wristwatch, and a notebook computer.

  DESCRIPTION OF SYMBOLS 1 ... Non-contact electric power feeder, 60 ... Primary side power transmission device, 61 ... Primary coil, 63 ... Thermistor (sensor), 70 ... Secondary side power receiving device, 71 ... Secondary coil, 110 ... Pot type magnetic body (1st 1 magnetic body), 113 ... bulging part, 114 ... hole, 120 ... flat plate type magnetic body (second magnetic body), 130 ... EER type magnetic body (first magnetic body), 133 ... bulging part, 134 ... hole , 140 ... EE type magnetic body (first magnetic body), 143 ... bulging part, 144 ... hole, 150 ... EI type magnetic body (first magnetic body), 153 ... bulging part, 154 ... hole.

Claims (9)

A primary-side power transmission device including a primary coil that generates an alternating magnetic flux upon receipt of electric power; and a secondary-side power reception device including a secondary coil that receives an alternating magnetic flux of the primary coil and generates an induced current; In a non-contact power feeding device including a sensor for detecting a change in state,
A first magnetic body provided in the primary power transmission device corresponding to the primary coil, and a second magnetic body provided in the secondary power reception device corresponding to the secondary coil;
At least one of the first magnetic body and the second magnetic body is provided with a bulging portion having holes extending in the arrangement direction of the primary coil and the secondary coil;
The contactless power feeding device, wherein the sensor is provided in the hole. The contactless power supply device according to claim 1,
A bulging portion of the first magnetic body is provided in the space of the central portion of the primary coil;
The non-contact power feeding device, wherein the sensor is provided in a hole of the bulging portion. In the non-contact electric power feeder of Claim 2,
The thickness of the portion of the first magnetic body where the bulging portion is provided is defined as the primary side thickness, and the thickness of the portion of the second magnetic body corresponding to the bulging portion of the first magnetic body is set to 2. When the secondary side thickness is used, the secondary side thickness is smaller than the primary side thickness. In the non-contact electric power feeder of Claim 2 or 3,
A cylindrical shape is provided as the bulging portion of the first magnetic body,
The contactless power feeding device, wherein the hole is provided in a central portion in a radial direction of the bulging portion. In the non-contact electric power feeder as described in any one of Claims 1-4,
A non-contact power feeding device, wherein the primary coil and the secondary coil are circular. In the non-contact electric power feeder of Claim 5,
A pot-type magnetic body is provided as at least one of the first magnetic body and the second magnetic body,
The pot-type magnetic body has a cylindrical outer periphery surrounding the outer periphery of the corresponding coil, the bulging portion disposed in the space of the central portion of the coil, and the opposite side of the other coil from the coil And a bottom wall portion that connects the outer peripheral portion and the bulging portion to each other. In the non-contact electric power feeder as described in any one of Claims 1-6,
A non-contact power feeding device, wherein a cylindrical shape is formed as the hole. In the non-contact electric power feeder as described in any one of Claims 1-7,
A bulging portion of the first magnetic body is provided in the space of the central portion of the primary coil;
What detects the temperature of the said primary side power transmission apparatus as said sensor is provided in the hole of the said bulging part. The non-contact electric power feeder characterized by the above-mentioned. In the non-contact electric power feeder as described in any one of Claims 1-7,
A bulging portion of the first magnetic body is provided in the space of the central portion of the primary coil;
What detects the change of the state of the said secondary side power receiving apparatus as said sensor is provided in the hole of the said bulging part. The non-contact electric power feeder characterized by the above-mentioned.

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