JP2013158148A - Charger - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an inexpensive charging device capable of supplying power to two electronic devices simultaneously by non-contact power supply using electromagnetic induction.
SOLUTION: Two storage portions 2 are formed in a cabinet 5 of a charging stand 1. Each accommodating portion 2 accommodates one portable electronic device 11 such that the longitudinal direction of the portable electronic device 11 is the vertical direction. The two receiving portions 2 are arranged so that the power receiving coils 13 of the respective portable electronic devices 11 are close to the power feeding coil 4 in the alternating magnetic field generated by the power feeding coil 4 and face each other with the power feeding coil 4 interposed therebetween. The portable electronic device 11 is accommodated.
[Selection] Figure 1

Description

  The present invention relates to a contactless charging apparatus that charges a secondary battery used in an electronic device by using an induced electromotive force by electromagnetic induction.

  For a charging device that supplies power from a commercial AC power source to an electronic device that uses a secondary battery to charge the secondary battery, connect the power line of the commercial AC power source directly to the contact terminal of the electronic device. A charging device that supplies power to an electronic device, and a power feeding coil provided in a power feeding device that is separate from the electronic device, and a power receiving coil is provided in an electronic device that is a power-supplied device. A charging device for supplying electric power is well known.

  When connecting the power line of a commercial AC power supply directly to the contact terminal of an electronic device, it can be a simple structure and an inexpensive device, but contact failure occurs due to wear and dirt of the contact contact of the contact terminal, There is a problem of low reliability. Further, when power is supplied in a non-contact manner by electromagnetic induction, the problem of poor contact is solved, but the power supply device and the power-supplied device can be individually connected in a one-to-one correspondence. In order to supply power to a plurality of power supplied devices, each power supplied device requires a power supply device, that is, a plurality of power supply devices are required, which is inconvenient for the user.

  FIG. 4 is a block diagram of a power supply device 80 and a power supplied device 81 according to the first conventional technique. The power feeding device 80 according to the first prior art is a non-contact power feeding device described in Patent Document 1, for example. The power supply device 80 is a charging device that charges the storage battery 814 provided in the power supplied device 81.

  The power feeding device 80 includes a plurality of power feeding coils 82, a plurality of switches 83, a position detection circuit 84, a rectifier circuit 85, and a resonance circuit 86. The power supplied device 81 includes a resonance coil 811, a capacitor 812, a rectifier circuit 813, a storage battery 814, and a load 815.

  The rectifier circuit 85 converts the AC voltage from the AC power supply 89 into a DC voltage. The resonance circuit 86 converts the DC voltage rectified by the rectification circuit 85 into an AC voltage and drives the power supply coil 82. The plurality of switches 83 switches on / off of the plurality of power supply coils 82. The position detection circuit 84 detects where the power supplied device 81 is placed.

  The power supply device 80 selects the power supply coil 82 that can be magnetically coupled most efficiently at the position of the power supplied device 81 detected by the position detection circuit 84, and turns on the switch 83 that switches on / off of the power supply coil 82. . When there are two or more power supplied devices 81, the plurality of switches 83 are turned on so that the power supply coils 82 can be driven according to the number of power supplied devices 81.

  Of the plurality of power supply coils 82, the power supply coil 82 switched on by the switch 83 is magnetically coupled to the resonance coil 811 of the power supplied device 81 and supplies power to the power supplied device 81. The resonance coil 811 and the capacitor 812 constitute a resonance circuit. The AC voltage from the resonance circuit is converted into a DC voltage by the rectifier circuit 813, and the storage battery 814 is charged by the converted DC voltage. The storage battery 814 applies a DC voltage to the load 815.

  FIG. 5 is a perspective view of a charging stand 90 and a battery built-in device 91 according to the second prior art. FIG. 6 is a block diagram of a charging stand 90 and a battery built-in device 91 according to the second prior art. The charging stand 90 according to the second prior art is a charging stand described in Patent Document 2, for example. The charging stand 90 is a charging device that charges a battery 911 provided in the battery built-in device 91.

  The charging stand 90 includes a power transmission coil 92, a moving mechanism 93, a position detection controller 94, an AC power supply 95, and a recognition indicator 96. The battery built-in device 91 includes a battery 911, a charge control circuit 912, a smoothing capacitor 913, a diode 914, a capacitor 915, and a power receiving coil 916.

  The power transmission coil 92 is connected to the AC power source 95 and induces an electromotive force in the power reception coil 916 provided in the battery built-in device 91. On the upper surface of the charging stand 90, an upper surface plate 99 for placing the battery built-in device 91 is provided. The upper surface plate 99 can mount a plurality of battery built-in devices 91. The power transmission coil 92 is a planar coil that is wound in a spiral shape on a plane parallel to the upper surface plate 99, and is supplied with AC power from an AC power source 95 to radiate AC magnetic flux above the upper surface plate 99.

  The moving mechanism 93 moves the power transmission coil 92 along the inner surface of the upper surface plate 99. The position detection controller 94 detects the position of the battery built-in device 91 placed on the upper surface plate 99 and controls the moving mechanism 93 to bring the power transmission coil 92 closer to the position where the battery built-in device 91 is detected. The recognition indicator 96 has a plurality of pilot lamps 961 and lights the pilot lamp 961 corresponding to the position of the battery built-in device 91 placed on the top plate 99.

  The position detection controller 94 includes a first position detection controller 941, a second position detection controller 942, a full charge detection circuit 943, a remaining capacity detection circuit 944, and an AC power supply 95. The first position detection controller 941 detects the position of the power receiving coil 916. The second position detection controller 942 detects the position of the power receiving coil 916 more precisely. The position detection controller 94 roughly detects the position of the power reception coil 916 by the first position detection controller 941, controls the moving mechanism 93, and moves the position of the power transmission coil 92 closer to the power reception coil 916. The position detection controller 942 of 2 detects the position of the power receiving coil 916 precisely and controls the moving mechanism 93 to bring the position of the power transmitting coil 92 closer to the power receiving coil 916.

  The full charge detection circuit 943 detects a full charge signal output from the battery built-in device 91 to detect full charge of the battery 911. The remaining capacity detection circuit 944 detects that the battery 911 being charged has been charged to the set remaining capacity. When the full charge detection circuit 943 detects the full charge of the battery 911 or the remaining capacity detection circuit 944 detects that the battery 911 is charged to the set remaining capacity, the charging stand 90 moves the power transmission coil 92 to the next. The battery is charged by approaching the power receiving coil 916 of the battery built-in device 91 to be charged.

  The capacitor 915 of the battery built-in device 91 is connected in parallel with the power receiving coil 916. The capacitor 915 and the power receiving coil 916 constitute a parallel resonance circuit. The resonance frequency between the capacitor 915 and the power receiving coil 916 is such that the power is efficiently generated from the power transmitting coil 92 to the power receiving coil 916 as a frequency that approximates the frequency of power transfer from the power transmitting coil 92.

  The diode 914 rectifies the AC voltage output from the power receiving coil 916. The smoothing capacitor 913 smoothes the pulsating current rectified by the diode 914. The diode 914 and the smoothing capacitor 913 constitute a rectifying and smoothing circuit. The charging control circuit 912 charges the battery 911 with a DC voltage output from the rectifying / smoothing circuit. The charge control circuit 912 detects full charge of the battery 911 and stops charging.

  As a third prior art, there is a charging device described in Patent Document 3. This charging device has two terminal mounting recesses to be mounted in a state where two mobile terminals are inserted and standing up, and simultaneously charges the two mobile terminals mounted in the two terminal mounting recesses be able to. However, this charging device charges the portable terminal using a power supply terminal provided at the bottom of each terminal mounting recess corresponding to the charging terminal of the portable terminal, and does not use electromagnetic induction.

JP 2006-149168 A JP 2010-183706 A Utility Model Registration No. 3128228

  Thus, the first prior art requires a plurality of power supply coils 82, a plurality of switching switches 83, a position detection circuit 84, and the like. Further, the second prior art requires a moving mechanism 93, a position detection controller 94, and the like. That is, any of the conventional techniques using electromagnetic induction requires a complicated circuit or mechanism, so that it is difficult to call an inexpensive charging device.

  An object of the present invention is to provide a charging device that can be supplied at low cost and can be simultaneously supplied to two electronic devices by non-contact power supply using electromagnetic induction.

The present invention is a charging device for charging the secondary battery of an electronic device comprising a secondary battery and a power receiving coil connected to the secondary battery by contactless power feeding,
A feeding coil that generates an alternating magnetic field when an alternating voltage is applied;
A power supply unit for applying an AC voltage to the feeding coil;
The power supply coil is disposed, and is a housing body having two housing portions that can house the electronic device, and the electronic device is housed in at least one of the two housing portions. The power receiving coil of the electronic device includes a container that is electromagnetically coupled to the power supply coil by an alternating magnetic field generated in the power supply coil.

In the present invention, the power supply unit
An AC / DC converter that converts AC voltage to DC voltage;
A booster that boosts the DC voltage converted by the AC / DC converter to the voltage required for the non-contact power supply;
A DC / AC converter that converts the DC voltage boosted by the booster to an AC voltage, and applies the converted AC voltage to the power supply coil;
It is characterized by including.

  Further, according to the present invention, the feeding coil is positioned such that an axis passing through the center thereof is on a straight line extending from an axis passing through the center of the receiving coil of the electronic device housed in at least one of the two housing portions. Further, it is arranged in the container.

  According to the present invention, the feeding coil forms an alternating magnetic field when an alternating voltage is applied. The power supply unit applies an AC voltage to the power supply coil. And a container has two accommodating parts which can each accommodate one each of the electronic devices containing the receiving battery which charges this secondary battery by the electromagnetic induction of a secondary battery and the said feeding coil, and each accommodating part is Each electronic device is accommodated such that a power receiving coil of each electronic device is disposed in an AC magnetic field generated by the feeding coil. Therefore, the charging device can simultaneously generate an induced electromotive force in the receiving coil by non-contact power supply using electromagnetic induction for the two electronic devices, and can charge the secondary battery by the induced electromotive force. Such a configuration eliminates the need for a plurality of feeding coils and a moving mechanism of the feeding coils, which are necessary in the prior art, so that the cost can be reduced by reducing the cost, and the charging device can be manufactured at a low manufacturing cost. It becomes possible to provide.

  Further, according to the present invention, the power supply unit requires an AC / DC conversion unit for converting an AC voltage from a commercial AC power source into a DC voltage, and a DC voltage converted by the AC / DC conversion unit for non-contact power supply. And a DC / AC converter that converts the DC voltage boosted by the booster to an AC voltage and applies the converted AC voltage to the power supply coil. Therefore, the charging device can use AC power as power source power from a commercial AC power source.

  According to the invention, the feeding coil is housed such that an axis passing through the center thereof is aligned with an axis passing through the center of the power receiving coil of the electronic device housed in at least one of the two housing portions. Provided on the body. Therefore, the charging device can form a stronger electromagnetic coupling between the power feeding coil and the power receiving coil, and can efficiently generate an induced electromotive force in the power receiving coil to charge the secondary battery.

It is sectional drawing which shows the state which mounted the two portable electronic devices 11 in the charging stand 1 which is one Embodiment of this invention. FIG. 2 is a front view showing a state where two portable electronic devices 11 are mounted on the charging stand 1. 2 is a block diagram showing an electrical configuration of a charging stand 1 and two portable electronic devices 11. FIG. It is a block diagram of the electric power feeder 80 by the 1st prior art, and the power supplied apparatus 81. FIG. It is a perspective view of the charging stand 90 and the battery built-in apparatus 91 by 2nd prior art. It is a block diagram of the charging stand 90 and the battery built-in apparatus 91 by 2nd prior art.

  FIG. 1 is a cross-sectional view showing a state where two portable electronic devices 11 are mounted on a charging stand 1 according to an embodiment of the present invention. FIG. 2 is a front view showing a state where two portable electronic devices 11 are mounted on the charging stand 1.

  A charging stand 1 as a charging device includes a feeding coil 4, a cabinet 5, a feeding coil lead wire 6, a feeding coil drive circuit 7, a printed circuit board 8, and an alternating current (hereinafter referred to as “AC”) adapter connection cable 9. Consists of.

  The feeding coil 4 is a planar coil, and the planar portion extends in the vertical direction when the portable electronic device 11 is mounted on the charging stand 1. The feeding coil 4 is configured to symmetrically form AC magnetic fields E1 and E2 on both sides of a planar coil when an AC voltage is applied. That is, the feeding coil 4 forms an electromagnetic induction loop on both sides of the planar coil. The portable electronic device 11 is realized by a portable terminal device such as a cellular phone.

  The feeding coil lead wire 6 is an electric wire formed by a conductor having good conductivity. The feeding coil lead wire 6 connects the feeding coil 4 and the feeding coil drive circuit 7. The feeding coil drive circuit 7 applies an AC voltage to the feeding coil 4 via the feeding coil lead wire 6. The feeding coil driving circuit 7 is formed on the printed board 8. The AC adapter cable 9 is a power cable for connecting a power terminal (not shown) of the printed circuit board 8 to an AC adapter 54 described later.

  The cabinet 5 is a housing that houses the power feeding coil 4, the power feeding coil lead wire 6, the power feeding coil drive circuit 7, and the printed board 8. The cabinet 5 is formed in a bottomed cylindrical shape whose side surface is constituted by the side wall 21 and whose bottom surface is constituted by the bottom portion 22, and is made of a magnetically permeable material that transmits an alternating magnetic field generated by the feeding coil 4, for example, made of synthetic resin. .

  The printed circuit board 8 is provided on the upper surface of the bottom portion 22. In the cabinet 5, one accommodating portion 2 is formed on each side of the plane portion of the feeding coil 4. Each accommodating portion 2 is formed with an insertion recess 24 that opens upward. The side surface of the insertion recess 24 extends along the vertical direction. The side wall 21 is inclined so as to approach the insertion recess 24 as the height increases.

  Each accommodating portion 2 accommodates one portable electronic device 11 inserted from the insertion recess 23 into the insertion recess 24. Each accommodating part 2 accommodates the portable electronic device 11 so that the longitudinal direction of the portable electronic device 11 is a vertical direction.

  The depth H <b> 2 of each housing portion 2 is formed to a depth equal to or greater than a depth at which the portable electronic device 11 does not fall in a state where the portable electronic device 11 is housed. The depth H2 of the housing portion 2 capable of stably supporting the portable electronic device 11 is a ratio (H2 / H1) to the length H1 in the longitudinal direction of the portable electronic device 11 (H2 / H1) of 0.3 to 0.5. Chosen.

  The depth of the accommodating portion 2, that is, the length in the thickness direction of the portable electronic device 11 accommodated in the accommodating portion 2, forms a gap that does not wobble the portable electronic device 11 to be accommodated, and the portable electronic device When inserting 11 into the accommodating part 2, it is the length which does not have trouble. If the depth of the housing portion 2 is too larger than the thickness of the portable electronic device 11, the distance between the power feeding coil 4 and the power receiving coil 13 may be increased, and the strength of electromagnetic coupling between the power feeding coil 4 and the power receiving coil 13 may be increased. Becomes weaker, and the possibility of a decrease in charging efficiency increases.

  Further, the lateral length of the accommodating portion 2, that is, the length in the short direction of the portable electronic device 11 accommodated in the accommodating portion 2 forms a gap that does not wobble the portable electronic device 11 to be accommodated. In addition, when the portable electronic device 11 is inserted into the housing portion 2, the length does not hinder. If the lateral length of the housing portion 2 is too longer than the length of the portable electronic device 11 in the short direction perpendicular to the paper surface of FIG. 1, the lateral displacement between the feeding coil 4 and the receiving coil 13 is large. The strength of electromagnetic coupling between the power feeding coil 4 and the power receiving coil 13 is weakened, and the possibility that the charging efficiency is reduced is increased.

  The power receiving coil 13 is a planar coil, and is provided so that the planar portion extends in the vertical direction and faces the power feeding coil 4 in a state where the portable electronic device 11 is accommodated in the accommodating portion 2.

  When the power receiving coil 13 is not provided at the center in the thickness direction of the portable electronic device 11, the power receiving coil 13 needs to be accommodated in the accommodating portion 2 with the side closer to the power feeding coil 4 being the power feeding coil 4 side. . That the power receiving coil 13 is provided at the center of the portable electronic device 11 in the thickness direction means that the center of the power receiving coil 13 is provided so as to coincide with the center of the portable electronic device 11 in the thickness direction. In this case, the two portable electronic devices 11 are housed in the housing portions 2 in the direction in which the front sides face each other or in the direction in which the back sides face each other. Therefore, in the charging stand 1 that accommodates such a portable electronic device 11, the feeding coil 4 is provided at the center of the width in the lateral direction of the accommodating portion 2, and the power receiving coil 13 is the It is provided at the center in the short direction.

  When the power receiving coil 13 is provided at the center in the thickness direction of the portable electronic device 11, the portable electronic device 11 can be accommodated in the accommodating portion 2 with either the front side or the back side facing the feeding coil 4. Good. However, it is necessary that the feeding coil 4 is provided at the center of the lateral width of the housing portion 2 and the power receiving coil 13 is provided at the center of the short direction of the portable electronic device 11. When the power receiving coil 13 is not provided in the center of the short side direction of the portable electronic device 11, the power feeding coil 4 is positioned opposite to the power receiving coil 13 when the portable electronic device 11 is accommodated in the accommodating portion 2. Need to be provided.

  The portable electronic device 11 that is an electronic device is configured by, for example, a mobile phone device or a mobile terminal device. The portable electronic device 11 includes a battery 12 and a power receiving coil 13. The battery 12 includes a secondary battery. The power receiving coil 13 is connected to the battery 12 and charges the battery 12 with electric power supplied by electromagnetic induction from the power feeding coil 4.

  Each receiving unit 2 has a power receiving coil 13 of each portable electronic device 11 facing the power feeding coil 4 in the AC magnetic fields E1 and E2 on both sides formed by the power feeding coil 4 and sandwiching the power feeding coil 4 therebetween. The portable electronic device 11 is accommodated so as to be arranged. The height at which the feeding coil 4 is provided is the height at which the power receiving coil 13 is positioned in a state where the portable electronic device 11 is accommodated in the accommodating portion 2, and connects the centers of the two portable electronic devices 11 in the short direction. Provided on a straight line. In other words, the feeding coil 4 has an axis passing through the center thereof aligned with an axis passing through the center of the power receiving coil 13 of the portable electronic device 11 housed in one of the two housing portions 2. And provided in the cabinet 5.

  With such a configuration, regardless of which state the portable electronic device 11 is housed in the two housing portions 2, the feeding coil 4 and the receiving coil 13 face each other, and the feeding coil 4 and the receiving coil 13. Strong electromagnetic coupling is formed between them, and an induced electromotive force can be efficiently generated in the power receiving coil 13 to charge the battery 12.

  The feeding coil 4 shown in FIG. 1 is provided at a height within the range of the depth H2 of the housing portion 2, but may be provided at a height exceeding the depth H2 of the housing portion 2. That is, in a state where the portable electronic device 11 is accommodated in the accommodating portion 2, when the power receiving coil 13 of the portable electronic device 11 exceeds the depth H <b> 2 of the accommodating portion 2, the power feeding coil 4 receives the power receiving coil 4. It is provided so as to be at a position facing the coil 13.

  FIG. 3 is a block diagram showing an electrical configuration of the charging stand 1 and the two portable electronic devices 11. The charging stand 1 further includes a coil driver circuit 51, a control circuit 52, a booster circuit 53, an AC adapter 54, and an AC outlet 55. The coil driver circuit 51, the control circuit 52, and the booster circuit 53 are formed on the printed circuit board 8.

  The AC outlet 55 is an outlet for connecting to a commercial AC power supply having a frequency of 50 Hz or 60 Hz, for example. The AC adapter 54 that is an AC / DC converter converts the AC voltage of the commercial AC power supplied via the AC outlet 55 into a DC voltage, and supplies the converted DC voltage to the booster circuit 53. The booster circuit 53 that is a booster boosts the DC voltage supplied from the AC adapter 54 to a voltage required for non-contact power supply, for example, 12 V, and supplies the boosted DC voltage to the coil driver circuit 51.

  The coil driver circuit 51 which is a DC / AC converter is the feeding coil driving circuit 7. The control circuit 52 controls the coil driver circuit 51. The coil driver circuit 51 converts the DC voltage supplied from the booster circuit 53 into an AC voltage having a high frequency, for example, 105 Hz to 1.4 MHz, in accordance with an instruction from the control circuit 52, and the converted AC voltage is supplied to the feeding coil 4. Apply. The coil driver circuit 51, the control circuit 52, the booster circuit 53, the AC adapter 54, and the AC outlet 55 form a power supply unit.

  The feeding coil 4 is configured to form alternating magnetic fields E1 and E2 symmetrically on both sides of the planar coil when the alternating voltage from the coil driver circuit 51 is applied. The power feeding coil 4 is electromagnetically coupled with the power receiving coil 13 and supplies power for charging the battery 12 to the power receiving coil 13.

  Since the charging stand 1 can be increased in voltage and converted into a high-frequency AC voltage by the AC adapter 54, the booster circuit 53, and the coil driver circuit 51, a commercial AC power source is used for charging as a power supply source. Can do.

  The portable electronic device 11 includes an electronic circuit 111 in addition to the battery 12 and the power receiving coil 13. The battery 12 includes a rectifier circuit 114, a contactless charge control circuit 113, and a battery cell 112.

  The power receiving coil 13 is located in the alternating magnetic fields E <b> 1 and E <b> 2 formed by the power feeding coil 4 when the portable electronic device 11 is accommodated in the accommodating portion 2. The power receiving coil 13 located in the AC magnetic fields E <b> 1 and E <b> 2 generates an AC voltage by electromagnetically coupling with the power feeding coil 4. The range in which the AC magnetic fields E1 and E2 are generated varies depending on the AC voltage applied to the feeding coil 4, the supplied power, the distance between the feeding coil 4 and the receiving coil 13, and the like. This is a range including the power receiving coil 13 of the portable electronic device 11.

  The AC voltage received by the power receiving coil 13 is supplied to the rectifier circuit 114. The rectifier circuit 114 converts the AC voltage supplied from the power receiving coil 13 into a DC voltage, and supplies the converted DC voltage to the contactless charging control circuit 113.

  The contactless charge control circuit 113 controls the charging current supplied to the battery cell 112 according to the state of the battery cell 112 so that the battery cell 112 is charged with an appropriate current. The battery cell 112 is a secondary battery and can be charged. The battery cell 112 has a positive potential side connected to the positive terminal 115 and a ground potential side connected to the negative terminal 116. The plus terminal 115 and the minus terminal 116 are connected to the electronic circuit 111 that is a load.

  The battery cell 112 applies a DC voltage charged in the battery cell 112 to the electronic circuit 111 via the plus terminal 115 and the minus terminal 116. The electronic circuit 111 is a circuit for realizing the function of the portable electronic device 11. For example, if the portable electronic device 11 is a mobile phone device, the electronic circuit 111 is a circuit for realizing a communication function.

  The two portable electronic devices 11 shown in FIG. 3 have the same configuration, but are not necessarily electronic devices having the same configuration. A battery cell similar to the battery cell 112 is similar to the power receiving coil 13. It is configured using a power receiving coil, and the power receiving coil of the electronic device housed in the housing portion 2 has the same position as the power receiving coil 13 of the portable electronic device 11, that is, the position facing the power feeding coil 4. That's fine.

  The charging stand 1 configured as described above can simultaneously charge two portable electronic devices 11 with one feeding coil 4. That is, since the charging stand 1 can simultaneously supply power to the two portable electronic devices 11 by non-contact power supply using electromagnetic induction, a plurality of power supply coils and power supplies required in the prior art are provided. A coil moving mechanism is not required. Moreover, since the charging stand 1 does not require a plurality of feeding coils and a moving mechanism of the feeding coils that are required in the prior art, the price can be reduced by cost reduction, and the charging stand 1 is provided at a low cost. It becomes possible.

  Thus, the feeding coil 4 forms an alternating magnetic field symmetrically on both sides when an alternating voltage is applied. The power supply unit applies an AC voltage to the feeding coil 4. The two housing units 2 each house one portable electronic device 11 including the power receiving coil 13 that charges the battery cell 112 by electromagnetic induction of the battery cell 112 and the power feeding coil 4. In addition, the two receiving portions 2 are disposed so that the power receiving coil 13 of each portable electronic device 11 is close to the power feeding coil 4 and sandwiches the power feeding coil 4 in the AC magnetic field on both sides formed by the power feeding coil 4. Thus, each portable electronic device 11 is accommodated. Therefore, the charging stand 1 can simultaneously supply power to the two portable electronic devices 11 by non-contact power supply using electromagnetic induction, and a plurality of power supply coils required in the prior art, Since the feeding coil moving mechanism is unnecessary, it is possible to reduce the cost by reducing the cost and to provide the charging stand 1 at a low cost.

  Further, the power supply unit includes an AC adapter 54 that converts an AC voltage from a commercial AC power source into a DC voltage, and a booster circuit 53 that boosts the DC voltage converted by the AC adapter 54 to a voltage required for non-contact power supply. A coil driver circuit 51 that converts the DC voltage boosted by the booster circuit 53 into an AC voltage and applies the converted AC voltage to the power feeding coil 4. Therefore, the charging stand 1 can use a commercial AC power supply as a power supply source.

  Furthermore, the feeding coil 4 is on a straight line that connects the centers in the short direction of the two portable electronic devices 11 at a height at which the power receiving coil 13 is located in a state where the portable electronic device 11 is accommodated in the accommodating portion 2. Provided. Therefore, the charging stand 1 can form stronger electromagnetic coupling between the power feeding coil 4 and the power receiving coil 13.

DESCRIPTION OF SYMBOLS 1 Charging stand 2 Storage part 4 Feeding coil 5 Cabinet 6 Feeding coil lead wire 7 Feeding coil drive circuit 8 Printed circuit board 9 AC adapter connection cable 11 Portable electronic device 12 Battery 13 Power receiving coil 21 Side wall 22 Bottom 23 Insertion recess 24 Insertion recess 51 Coil Driver Circuit 52 Control Circuit 53 Booster Circuit 54 AC Adapter 55 AC Outlet 111 Electronic Circuit 112 Battery Cell 113 Contactless Charging Control Circuit 114 Rectifier Circuit E1, E2 AC Magnetic Field

Claims (3)

A charging device for charging the secondary battery of an electronic device including a secondary battery and a power receiving coil connected to the secondary battery by contactless power feeding,
A feeding coil that generates an alternating magnetic field when an alternating voltage is applied;
A power supply unit for applying an AC voltage to the feeding coil;
The power supply coil is disposed, and is a housing body having two housing portions that can house the electronic device, and the electronic device is housed in at least one of the two housing portions. And a receiving body that electromagnetically couples to the power supply coil by an alternating magnetic field generated in the power supply coil. The power supply unit is
An AC / DC converter that converts AC voltage to DC voltage;
A booster that boosts the DC voltage converted by the AC / DC converter to the voltage required for the non-contact power supply;
A DC / AC converter that converts the DC voltage boosted by the booster to an AC voltage, and applies the converted AC voltage to the power supply coil;
The charging device according to claim 1, comprising:   The power supply coil is configured such that the axis passing through the center thereof is positioned on a straight line extending from the axis passing through the center of the power receiving coil of the electronic device housed in at least one of the two housing parts. The charging device according to claim 1, wherein the charging device is disposed on the charging device.