JP2001196249A - Detector employing non-contact power feeding - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a complicated structure and a variation in performance of a photo coupler caused by variety of installation, in which a photo diode and a photo transistor in the photo coupler are separately installed by using a board. SOLUTION: A primary side iron-core coil 2 is composed of a primary side core 2a, a photo transistor 5 installed in a through hole 2c, and a secondary side coil 3b. A secondary side iron-core coil 3 is composed of a secondary side core 3a, a photo diode 4 installed in a through hole 3c, and a secondary side coil 3b. A conversion coil 1 is composed of the primary side iron-core coil 2, the secondary side iron-core coil 3, and two infrared ray transmitting material 6. By arranging the relative position between the primary side iron-core coil 2 and the secondary side iron-core coil 3 adequately, the power on the primary side is sent effectively to the secondary side. The optical axis of the photo diode 4 and the photo diode 5 is made coincident to realize the maximum performance.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a non-contact power supply detecting device used for a charging device of a small electronic device or the like.

[0002]

2. Description of the Related Art FIG. 4 is an inverter circuit diagram using a conventional detection device using non-contact power supply. In the figure, 21 is an inverter converter for converting input AC or DC to high frequency AC, 31 is a conversion coil composed of a primary side coil and a secondary side coil which are not in contact with each other, and 23 is a secondary side coil A rectifying unit for rectifying high-frequency AC induced in the coil to DC, a detecting unit for detecting a voltage of a DC output from the rectifying unit, and a photodiode for converting an output of the detecting unit into an optical signal and transmitting the optical signal Reference numeral 5 denotes a phototransistor that receives an optical signal from the photodiode 4 and converts it into an electric signal. Reference numeral 27 denotes a phototransistor.
Is a control unit that controls the inverter conversion unit 21 based on the output from the controller.

[0003] The DC output supplied to the load is detected by voltage detection.
A stable output is obtained by the negative feedback circuit of the detection unit 24 → photodiode 4 → phototransistor 5 → control unit 27.

[0004]

However, in the conventional detection device using non-contact power supply, the photodiode and the phototransistor constituting the photocoupler are separately provided using a substrate or the like, so that the structure is complicated. There is a problem that the performance of the photocoupler varies due to the variation in installation.

[0005] The present invention has been made in view of the above points, and the photodiode and the phototransistor constituting the photocoupler are installed without using a substrate or the like, and the photocoupler has a simple structure and a variation in installation. It is an object of the present invention to provide a detection device that uses non-contact power supply that does not vary in performance.

[0006]

A phototransistor is provided in a through hole provided in the center of the core of the primary coil of the conversion coil, and a photodiode is provided in a through hole provided in the center of the core of the secondary coil of the conversion coil. By doing so, the photocoupler is integrated with the conversion coil.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In order to solve the problems, a detection device using non-contact power supply according to the present invention is an AC / DC or DC / DC inverter using a high-frequency transformer whose primary and secondary sides are non-contact. In a detection device using non-contact power supply, a detection unit 24 that detects a voltage of a DC output of the inverter, a photodiode 4 that converts an electric signal from the detection unit 24 into an optical signal, and converts the optical signal into an electric signal. The photodiode 4 is provided in a through hole 3c provided in the center of the secondary core 3a of the secondary cored coil 3 of the conversion coil 1 composed of the high frequency transformer. The phototransistor 5 is similarly installed in a through hole 2c provided in the center of the primary core 2a of the primary coil 2 of the conversion coil 1. It has a feature to Rukoto.

Further, the detection device based on non-contact power supply of the present invention is characterized in that the primary core and the secondary core on which the photodiode 4 and the phototransistor 5 are provided are pot cores 11.

Further, according to the present invention, there is provided a detecting device using non-contact power supply, comprising a photodiode 4 and a phototransistor 5.
Is characterized in that the primary core and the secondary core in which are installed are E-shaped cores 12.

[0010]

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a cross-sectional view of a conversion coil having a photocoupler of a detection device using wireless power supply. In the drawing, reference numeral 2 denotes a coil with a primary core, and a primary core 2a.
And a phototransistor 5 installed in a central through-hole 2c. Similarly, reference numeral 3 denotes a coil with a secondary iron core, which is composed of a secondary coil 3b disposed in a concave portion of the secondary core 3a and a photodiode 4 disposed in a through hole 3c at the center. . The conversion coil 1 includes a coil with a primary core 2, a coil with a secondary core 3, and two infrared transmitting materials 6 inserted between the primary side and the secondary side.

By properly setting the relative positions of the coil 2 with the core on the primary side and the coil 3 with the core on the secondary side, the power on the primary side can be efficiently transmitted to the secondary side in a non-contact manner.
At the same time, each through-hole 2 of the primary side core 2a and the secondary side core 3a
The optical axes of the phototransistors 5 and the photodiodes 4 provided at the positions c and 3c coincide with each other, and the performance as a photocoupler can be maximized.

FIG. 2 is a perspective view of a core of a conversion coil having a photocoupler of a detection device using non-contact power supply. (A) shows the pot core 11, and (b) shows E.
The mold core 12 is shown.

FIG. 3 is an inverter circuit diagram having a detecting device using non-contact power supply in an embodiment of the present invention. Elements denoted by the same reference numerals as those in FIG. 4 indicate the same elements, and the description thereof will be omitted. As for the DC output supplied to the load, a stable output can be obtained by a negative feedback circuit of voltage detection → detection unit 24 → photodiode 4 → phototransistor 5 → control unit 27. Since the conversion coil 1 includes the phototransistor 5 and the photodiode 4 as a photocoupler, the optical axes of the phototransistor 5 and the photodiode 4 easily coincide with each other.
The feedback function can be exhibited efficiently.

[0014]

As described above, in the detection device using the non-contact power supply of the present invention, the detection unit 24 for detecting the voltage of the DC output of the inverter, and the electric signal from the detection unit 24 is converted into an optical signal. And a phototransistor 5 for converting the optical signal into an electric signal. The photodiode 4 is a coil 3 with a secondary core of the conversion coil 1 comprising the high-frequency transformer.
The phototransistor 5 is similarly provided in a through hole 2c provided in the center of the primary core 2a of the primary core 2a of the conversion coil 1 in the center of the secondary core 3a. Since there is no need to provide a separate board or separate circuit, it is possible to commercialize the product with only a primary and secondary conversion transformer, simplifying the structure, making positioning of the phototransistor and photodiode easy and accurate. become.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a conversion coil having a photocoupler of a detection device using wireless power supply according to an embodiment of the present invention.

FIGS. 2A and 2B are perspective views of a core of a conversion coil having a photocoupler of a detection device using non-contact power supply according to an embodiment of the present invention.

FIG. 3 is an inverter circuit diagram having a detection device using wireless power supply in an embodiment of the present invention.

FIG. 4 is an inverter circuit diagram using a detection device based on non-contact power supply in a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Conversion coil 2 Primary side cored coil 2a Primary side core 2b Primary side coil 2c Through hole 3 Secondary side cored coil 3a Secondary side core 3b Secondary side coil 3c Through hole 4 Photodiode 5 Phototransistor 6 Infrared transmitting material DESCRIPTION OF SYMBOLS 11 Pot core 12 E type core 21 Inverter conversion part 23 Rectification part 24 Detection part 27 Control part 31 Conversion coil

Claims (3)

[Claims] An AC / DC or DC / DC inverter using a high-frequency transformer having a non-contact primary side and a secondary side by non-contact power supply, wherein a voltage of a DC output of the inverter is detected. Part (2
4), a photodiode (4) for converting an electric signal from the detection unit (24) into an optical signal, and a phototransistor (5) for converting the optical signal into an electric signal. (4) is installed in a through-hole (3c) provided in the center of the secondary core (3a) of the secondary cored coil (3) of the conversion coil (1) comprising the high-frequency transformer. The transistor (5) is similarly connected to the primary core (2) of the primary coil (2) of the conversion coil (1).
a) A detection device using non-contact power supply, which is provided in a through hole (2c) provided in a central portion. 2. The non-contact power supply according to claim 1, wherein the primary core and the secondary core on which the photodiode (4) and the phototransistor (5) are installed are pot cores (11). Detection device. 3. The non-contact power according to claim 1, wherein the primary core and the secondary core on which the photodiode (4) and the phototransistor (5) are installed are E-shaped cores (12). Detector with power supply.