JPH11266545A - Portable noncontact power-feeding device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To supply power without contact, even when a device is being carried by recharging an electrical energy that is converted by a photoelectric conversion means, and supplying the recharged electrical energy to a load device by an alternate magnetic field, without a contacts. SOLUTION: Eelectrical energy that is accumulated in a recharging means 4 is supplied to a DC-to-AC conversion circuit 6, and the DC-to-AC conversion circuit 6 converts the electrical energy that is accumulated in the recharging means 4 from DC to AC. An electrical energy that is converted into AC by the DC-to-AC conversion circuit 6 is discharged into space as an alternate magnetic field by a transmission coil 7 and reaches the load device 10. The alternate magnetic field that is discharged from the transmission coil 7 to space is converted into an AC electrical energy by a reception coil 11, is converted into a DC voltage by a rectification/smoothing circuit 12, and is supplied to the load circuit 4. When a load device detector 5 is unable to detect the presence of the load device 210 due to load device presence reporting equipment 13, the electrical energy that is accumulated in the recharging means 4 is not supplied.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power supply apparatus for supplying electric power to portable equipment or the like in a non-contact manner, and more particularly to a portable non-contact power supply apparatus which can be operated even while being carried.

[0002]

2. Description of the Related Art Conventionally, non-contact power supply has been considered for charging a storage battery incorporated in an electric toothbrush, an electric shaver, a mobile phone, or the like, or supplying power to a non-contact IC card. In the charging application, the portable device is charged by approaching a charger using commercial power as a power source. When power is supplied to the non-contact IC card, the IC card approaches the card reader / writer at irregular intervals, so that the card reader / writer is always in an operating state and uses commercial power as a power source. As described above, in the conventional non-contact power supply application, commercial power has been used as the power source of the power supply device.

FIG. 3 shows a system including the above-mentioned non-contact power supply mechanism. In the figure, 100 is a contactless power supply device such as a charger, and 200 is a load device such as an electric toothbrush. The commercial power supply 101 is an AC-DC conversion circuit 10
2 and the AC-DC converter 102 is connected to the DC-AC converter 103 and the DC-AC converter 1
The output of 03 is connected to the power transmission coil 104. The power receiving coil 201, the diode 204, the switch 206, and the DC motor 207 are connected in series.
01, and the storage battery 205 is connected in parallel to a series connection of the receiving coil 201 and the diode 204.

Next, the operation will be described. The commercial power supply 101 is converted to a DC voltage by an AC-DC conversion circuit 102, and the DC voltage is converted to an AC voltage having a frequency higher than that of the commercial power supply by a DC-AC conversion circuit 103, and a power transmission coil 104.
, And the power transmission coil 104 generates an alternating magnetic field. The receiving coil 201 converts the alternating magnetic field into an AC voltage, converts the AC magnetic field into a DC voltage by the diode 204, and stores the DC voltage in the storage battery 205. The AC voltage generated by the power receiving coil 201 is applied to the light emitting diode 202 by the resistor 203, and the light emitting diode 202 emits light. When the load device 200 is used, when the switch 206 is turned on, the DC motor 207 rotates, and a predetermined toothbrush mechanism operates.

[0005]

However, in a conventional system including a non-contact power supply mechanism, a commercial power supply is used as a power source of the non-contact power supply apparatus. There was a problem that could not be used. Further, since the non-contact power supply device always generates an alternating magnetic field regardless of the presence or absence of a load device, there is a problem that power consumption is large and a portable battery cannot be used as a power source. The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a portable non-contact power supply device capable of performing a non-contact power supply operation even when carrying.

[0006]

In order to achieve the above object, a portable wireless power supply according to the present invention comprises a photoelectric conversion means for converting light energy into electric energy, and an electric energy converted by the photoelectric conversion means. And electric power supply means for supplying the electric energy stored in the power storage means to the load device in a non-contact manner by an alternating magnetic field.

Further, the present invention provides the portable wireless power supply device, wherein the presence of the load device is detected, and only when the load device is present, the load device detection device supplies the electric energy stored in the power storage means to the load device. Means are provided.

According to the present invention, in the portable non-contact power supply device, as a load device detecting means, a switch is closed only during a period when a magnetic field of a predetermined value or more from a permanent magnet for supplying a magnetic field to the load device is received. A switch is used.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a configuration explanatory view showing an embodiment of the present invention. In the figure, 1 is a non-contact power supply device, 2 is a photoelectric conversion unit such as a solar cell, 3 is a backflow prevention diode, 4 is a power storage unit such as a storage battery, 5
Is a load device detector, 6 is a DC-AC conversion circuit, 7 is a power transmission coil, 10 is a load device, 11 is a power receiving coil, 12 is a rectifying / smoothing circuit, 13 is a load device presence alarm, and 14 is a load circuit. .

[0010] These operations will be described below. Electric energy generated by irradiating light to, for example, a solar cell as the photoelectric conversion means 2 passes through the backflow prevention diode 3,
The power is stored in, for example, a storage battery as the power storage means 4, and the load device detector 5 is turned on by the load device presence alarm 13.
Is detected, the electric energy stored in the power storage means 4 is supplied to a circuit having the following configuration as a means for supplying the load device 10 in a non-contact manner. That is, the electric energy stored in the power storage means 4 is supplied to the DC-AC conversion circuit 6, and the DC-AC conversion circuit 6
Converts the electric energy stored in the power storage means 4 from DC to AC. The electric energy converted into AC by the DC-AC conversion circuit 6 is transmitted by the power transmission coil 7.
It is emitted into space as an alternating magnetic field and reaches the load device 10.
The alternating magnetic field emitted into the space from the power transmitting coil 7 is converted into AC electric energy by the power receiving coil 11, converted into DC voltage by the rectifying / smoothing circuit 12, and
4 is supplied.

When the load device detector 5 cannot detect the presence of the load device 10 by the load device presence indicator 13, the electric energy stored in the power storage means 4 is supplied to the load device 10 in a non-contact manner. DC as a means
It is not supplied to the AC conversion circuit 6 and the power transmission coil 7.

FIG. 2 is a circuit diagram showing an example of the specific circuit of FIG. In the figure, reference numeral 20 denotes a non-contact power supply device, 21
Is a solar cell, 22 is a diode, 23 is a storage battery, 24 is a magnetic switch, 25 is a PNP transistor, 26 is a power transmission coil, 27 is an NPN transistor, 28 is a capacitor, 29 is a resistor, 30 is a load device, 31 is a power receiving coil,
32 is a diode, 33 is a coil, 34 is a diode,
35 is a capacitor, 36 is a load circuit, and 37 is a permanent magnet.

As an example of the load device detector 5 of FIG. 1, a magnetic switch 24 whose switch is closed only during a period when a magnetic field of a predetermined value or more is received can be used. FIG.
The permanent magnet 37 can be used as an example of the load device presence alarm 13 of FIG. In this example, by providing the permanent magnet 37 as a means for supplying a magnetic field to the load device 30,
The non-contact power supply device 20 performs energy transmission only when the load device 30 exists within a distance in which energy can be transmitted, thereby preventing meaningless energy consumption.

As a specific example of the DC-AC conversion circuit 6 of FIG. 1, a PNP transistor 25 and a power transmission coil 26
, NPN transistor 27, capacitor 28 and resistor 29
Can be used.

The correspondence between the components in FIG. 1 and the components in FIG. 2 will be described.
0, the photoelectric conversion means 2 corresponds to the solar cell 21,
The backflow prevention diode 3 corresponds to the diode 22, the power storage means 4 corresponds to the storage battery 23, the power transmission coil 7 corresponds to the power transmission coil 26, the load device 10 corresponds to the load device 30, and the power reception coil 11 corresponds to the power reception coil 31. Rectification
The smoothing circuit 12 includes a diode 32, a coil 33, a diode 34, and a capacitor 35, and the load circuit 14 corresponds to a load circuit 36.

The operation of FIG. 2 will be described below. Solar cell 2
The electric energy generated by irradiating the light 1 passes through the backflow prevention diode 22 and is stored in the storage battery 23. When the magnetic switch 24 detects the presence of the load device 30 by the permanent magnet 37, the storage battery 23 The stored electric energy is transferred to the PNP transistor 25 and the power transmission coil 2.
6, NPN transistor 27, capacitor 28 and resistor 2
9 to convert the electric energy stored in the storage battery 23 from DC to AC. The electric energy converted into alternating current by the self-excited oscillation circuit is discharged into space as an alternating magnetic field by the power transmission coil 26 and reaches the load device 30. The power transmission coil 26
The alternating magnetic field emitted into the space from the converter is converted into AC electric energy by the power receiving coil 31, and is converted into DC voltage by the rectifying / smoothing circuit composed of the diode 32, the coil 33, the diode 34, and the capacitor 35. 36.

When the magnetic switch 24 cannot detect the presence of the load device 30 by the permanent magnet 37, the electric energy stored in the storage battery 23 is supplied to the load device 30 in a non-contact manner by the self-excitation. It is not supplied to the oscillation circuit and the power transmission coil 26.

[0018]

As described above, according to the present invention, in a power supply device for performing non-contact energy transmission by a magnetic circuit using an alternating magnetic field as a power supply means for a portable device, light energy is converted into electric energy. By providing a means for replacing and a means for storing converted electric energy, power can be supplied in a non-contact manner even in a place where commercial power cannot be obtained.

Further, by providing a means for detecting the presence of the load device and supplying power only when the load device is present, an ineffective power consumption is eliminated, and a non-contact power supply device which can be operated in a portable manner is provided. Can be provided. Furthermore, since it is not necessary to provide the load device with a power storage means, the load device can be reduced in size and thickness, which is suitable for forming a card-shaped load device.

[Brief description of the drawings]

FIG. 1 is a configuration explanatory diagram showing an embodiment of the present invention.

FIG. 2 is a circuit diagram showing an example of a specific circuit of FIG. 1;

FIG. 3 is a circuit diagram showing a system including a conventional contactless power supply mechanism.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Non-contact electric power supply, 2 ... Photoelectric conversion means, 3 ... Diode, 4 ... Power storage means, 5 ... Load device detector, 6 ... DC-AC conversion circuit, 7 ... Power transmission coil, 10 ... Load device, 11 ...
Receiving coil, 12: rectifying / smoothing circuit, 13: load device presence alarm, 14: load circuit, 20: non-contact power supply device, 2
DESCRIPTION OF SYMBOLS 1 ... Solar cell, 22 ... Diode, 23 ... Storage battery, 24
... Magnetic switch, 25 ... PNP transistor, 26 ... Transmission coil, 27 ... NPN transistor, 28 ... Capacitor, 29 ... Resistance, 30 ... Load device, 31 ... Reception coil,
32 ... diode, 33 ... coil, 34 ... diode,
35: condenser, 36: load circuit, 37: permanent magnet,
100: non-contact power supply device, 101: commercial power supply, 102:
AC-DC conversion circuit, 103 ... DC-AC conversion circuit, 1
04: power transmission coil, 200: load device, 201: power reception coil, 202: light emitting diode, 203: resistor, 204
... Diode, 205 ... Battery, 206 ... Switch, 2
07 ... DC motor.

Claims (3)

[Claims] A photoelectric conversion means for converting light energy into electric energy; a power storage means for storing the electric energy converted by the photoelectric conversion means; and an electric field stored in the power storage means in a non-contact manner by an alternating magnetic field. And a power supply means for supplying a power to the load device. 2. A load detecting device for detecting the presence of a load device and supplying the electric energy stored in the storage device to the load device only when the load device is present. The portable wireless power feeding device according to claim 1. 3. The load device detecting means according to claim 2, wherein a magnetic switch whose switch is closed only during a period when a magnetic field of a predetermined value or more is received from a permanent magnet that supplies a magnetic field to the load device is used. Portable wireless power supply.