JP2727752B2 - Power transfer device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power transfer device for transferring power by light waves.

2. Description of the Related Art There is a conventional power transfer device as shown in FIG. In FIG. 3, 1 is a main circuit having power supply means, and 2 is an auxiliary circuit. Reference numeral 3 denotes a line for transferring power from the main circuit to the auxiliary circuit. The power supply means 101 supplies power to the first circuit 102 and also supplies power to the second circuit 201 of the auxiliary circuit 2 via the line 3.

Problems to be Solved by the Invention However, in the above-described configuration, there is a possibility of electric leakage or explosion when the line passes near a water pipe or a gas pipe.
Further, the line absorbs moisture, and due to the capillary phenomenon, moisture is transmitted to the main circuit or the auxiliary circuit, which may cause a failure in the circuit.

In addition, the line is conductive and may act as an antenna to transmit noise into the circuit.

An object of the present invention is to solve such a conventional problem, and an object of the present invention is to enable safe power transfer by transmitting power by light waves.

Means for Solving the Problems To solve the above problems, the power transfer device of the present invention is
A main circuit having a power supply unit and a light emitting unit; an auxiliary circuit having a photoelectric conversion unit; a light wave transmitting unit for transmitting a light wave of the light emitting unit of the main circuit to a photoelectric conversion unit of the auxiliary circuit; the main circuit and the light wave A first gap, which is spaced more than a gap where water stays due to surface tension provided between the transmission means, and a gap where water stays due to surface tension provided between the auxiliary circuit and the lightwave transmission means, This is a configuration having a second gap spaced apart.

Operation With the above configuration, electric power is transmitted by light waves, and a gap is provided between the circuit and the light wave transmitting means to prevent moisture from entering the circuit.

Embodiment Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a sectional view of the power transmission device, and the same parts as those in FIG. 3 are denoted by the same reference numerals. 10 in main circuit 1
2 is a first circuit, 103 is a light emitting means for converting electric power into light (for example, an LED or a semiconductor laser), and 104 is the light emitting means 103
Is driving means for driving. In the auxiliary circuit 2, reference numeral 201 denotes a second circuit, and reference numeral 202 denotes photoelectric conversion means (for example, a solar cell or the like) for converting light waves into electricity.

Reference numeral 4 denotes a light wave transmitting unit that transmits the light of the light emitting unit to the photoelectric conversion unit 202. A first gap 5 is provided between the main circuit 1 and the lightwave transmission means 4 at a distance larger than a gap in which water stays due to surface tension. Has a second gap 6 spaced apart from the gap where water stays due to surface tension.

 Next, the operation of the configuration of the present invention will be described.

Normally, the first circuit 102 in the main circuit 1
Supplies electricity directly from The means for supplying power to the second circuit 201 in the auxiliary circuit 2 will be described.

For example, if the auxiliary circuit 2 is separated from the main circuit 1 or installed in a place where no one can reach, the battery cannot be replaced, and it is necessary to supply power from the main circuit.

In the main circuit 1, the driving means 104 drives the light emitting means 103 to convert electric power into light. The light wave from the light emitting means 103 is the first
After the light propagates through the gap 5, it enters the lightwave transmission means 4. The light that has propagated in the lightwave transmission means 4 passes through the second gap and then travels to the photoelectric conversion means 202 in the auxiliary circuit 2. The photoelectric conversion unit 202 converts the received light into electric power and supplies the electric power to the second circuit 201. If the second circuit 202 includes a large-capacity capacitor or a secondary battery, stable power supply becomes possible.

Further, when the light condensing means 402 and 403 are provided on both end surfaces of the light wave transmitting means, the transmission efficiency can be improved.

When the power is carried as described above, the lightwave transmission means 4
However, there is no possibility of electric leakage or explosion even when passing near water pipes or gas pipes, and it is safe. Further, even if the light wave transmitting means 4 absorbs moisture and the moisture is transmitted to the main circuit 1 or the auxiliary circuit 2 by the capillary phenomenon, the first gap 5 and the second gap 5 are spaced apart from the gap where the water stays due to surface tension. Due to the presence of the gap 6, it is not easy for the transmitted moisture to penetrate from here. Therefore, there is no possibility that moisture will enter the circuit and cause a failure.

Further, since the line is non-conductive, it acts as an antenna and does not transmit noise into the circuit. Further, when power is transferred in the form of electricity, two lines are required, but when light is used, only one line is required, which facilitates installation.

In the above-mentioned embodiment, as shown in FIG. 2A, a light collecting means using a line (for example, an optical fiber) as the light wave transmitting means 4 is used.
Light waves may be transmitted in space using only 402 and 403.
Further, when light reflecting means 404 and 405 are provided between the light condensing means 402 and 403 as shown in FIG. 2B, light can be transmitted even if the light emitting means 103 and the photoelectric conversion means 202 are not coaxial. .

When either the main circuit 1 or the auxiliary circuit 2 is not fixed, the space transmission as shown in FIGS. 2A and 2B is convenient because the line is not routed.

As described above, the power transfer device of the present invention includes a main circuit having a power supply unit and a light-emitting unit, an auxiliary circuit having a photoelectric conversion unit, and a lightwave of the light-emitting unit of the main circuit. A light wave transmitting means for transmitting to the conversion means, a first gap provided between the main circuit and the light wave transmitting means, the first gap having a distance larger than a gap where water stays due to surface tension, the auxiliary circuit and the light wave transmission It has a structure with a second gap separated from the gap where water stays due to the surface tension provided between the means, so that leakage or explosion is possible even if the light wave transmission means passes near the water pipe or gas pipe. Safe with no sex. Further, even if the light wave transmitting means 4 absorbs moisture and the moisture is transmitted to the main circuit 1 or the auxiliary circuit 2 by the capillary phenomenon, the first gap 5 and the second gap 5 are spaced apart from the gap where the water stays due to surface tension. Due to the presence of the gap 6, it is not easy for the transmitted moisture to penetrate from here. Therefore, there is no possibility that moisture will enter the circuit and cause a failure.

Further, since the line is non-conductive, it acts as an antenna and does not transmit noise into the circuit.

In addition, when power is transmitted by lightwave transmission, only one line is required and installation is easy, and an accident of the line itself (for example, a short-circuit and grounding accident between lines) is eliminated, thereby improving reliability.

[Brief description of the drawings]

FIG. 1 is a block diagram of a power transfer device according to an embodiment of the present invention, FIGS. 2a and 2b are block diagrams of another embodiment of the same device, and FIG. 3 is a block diagram of a conventional power transfer device. is there. 1 ... main circuit, 2 ... auxiliary circuit, 4 ... light wave transmission means,
5 ... first gap, 6 ... second gap, 103 ... light emitting means, 202 ... photoelectric conversion means, 403, 404 ... light collecting means.

 ──────────────────────────────────────────────────の Continued on the front page (72) Inventor Yukio Nagaoka 1006 Kadoma Kadoma, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. In-house (56) References JP-A-55-63525 (JP, A)

Claims (1)

(57) [Claims] A main circuit having a power supply unit and a light emitting unit; an auxiliary circuit having a photoelectric conversion unit; a light wave transmitting unit transmitting a light wave of the light emitting unit of the main circuit to the photoelectric conversion unit of the auxiliary circuit; A first gap provided between the main circuit and the lightwave transmission means, the gap being larger than a gap in which water stays due to surface tension, and a water gap formed by the surface tension provided between the auxiliary circuit and the lightwave transmission means. A power transfer device having a second gap separated by a distance greater than or equal to the gap in which the liquid stays.