JPH0242041Y2 - - Google Patents

Description

[Detailed Description of the Invention] (a) Field of Industrial Application This invention relates to an electromagnetically coupled charging device that includes an electromagnetically coupled primary coil and secondary coil.

(B) Prior Art In general, an electromagnetic coupling type charging device for charging a battery is configured as shown in FIGS. 1 and 2, for example. In the figure, 1 is a high frequency AC power supply;
2 is a primary coil wound around a cylindrical ferrite core 2', both ends of which are connected to a power source 1, and constitutes a high frequency transmission transformer 3 which is a primary side component together with the power source 1; 4 is a primary coil wound around a battery can 4'); 5 is a rectifier diode whose anode is connected to one end of the secondary coil 4; 6 is a rectifier diode whose positive and negative terminals are the cathode and the cathode of the diode 5, respectively; A battery is connected to the other end of the secondary coil 4, and a load 7 such as an amplifier is connected between both ends of the battery 6, and the secondary coil 4, rectifying element 5, battery 6, and load 7 form a secondary side configuration. The secondary side component 8 is housed in a case 9 made of a polymer material, and the primary coil 2 of the transmission transformer 3 is connected to the secondary coil 4 of the secondary side component 8. By bringing them close, the battery 6 is charged, and when in use, DC power is supplied from the battery 6 to the load 7, and the load 7 is operated.

(c) Problems to be solved by the invention In the case of the conventional configuration described above, when the case 9 is implanted in the human body as an artificial middle ear, for example, it is difficult to recognize the position of the secondary coil 4 when charging the battery 6. Because it cannot be done, the primary coil 2 and secondary coil 4
The degree of electromagnetic coupling with the battery 6 deteriorates, and a sufficient charging current does not flow to the battery 6, resulting in the inconvenience that proper charging cannot be performed. Furthermore, when the secondary side component 8 is housed in one case 9, it is not possible to arrange the battery 6 in the center of the case 9 due to packaging density. Therefore, the secondary coil 4 is also located at either end of the case 9, and when charging, the primary coil 2 and the secondary coil 4 are
Positional deviation between the coils 2 and 4 is likely to occur, and the degree of electromagnetic coupling between the coils 2 and 4 is reduced.

Therefore, in order to improve the degree of coupling, for example, it is possible to provide a detection means that detects the voltage across the primary coil 2 and detects the position of the primary coil 2 and the secondary coil 4, that is, the degree of electromagnetic coupling. However, the number of parts is large and the cost is high. Further, in order to improve safety, if the case 9 is made of metal such as stainless steel, the secondary coil 4 is located at the end inside the case as described above when detected by the detection means. Sometimes, due to the influence of the metal case, the voltage across the primary coil 2 drops significantly out of proportion to the charging current, making accurate detection impossible.

(d) Means for solving the problem The present invention was made with the above points in mind, and its gist is that the primary side consisting of an AC power source and a primary coil connected to the power source a component, a metal case separably provided in the primary component, a hollow bobbin disposed within the case, and a metal case wound around the bobbin in a shape along the inner circumference of the case. The present invention provides an electromagnetic coupling type charging device including a secondary coil provided to be electromagnetically coupled to the primary coil, and a secondary side component including a circuit section disposed in the hollow.

(E) Effect According to the device of the present invention, the secondary coil is wound around the bobbin in a shape that follows the inner circumference of the case, thereby suppressing misalignment of both coils and making the case made of highly safe metal. Even so, the voltage across the primary coil is approximately proportional to the charging current, and accurate detection can be performed, so that the degree of electromagnetic coupling during charging can be improved. Moreover, by arranging circuit parts such as a battery, a rectifier circuit, and a load in the hollow bobbin, the packaging density of the circuit parts can be improved.

(F) Example Hereinafter, one example of the present invention will be described based on FIGS. 3 and 4.

3 and 4, the same symbols as in FIGS. 1 and 2 indicate the same things, and the difference from FIGS. 1 and 2 is that the transmission transformer 3 is provided with a metal case 10 that can be freely separated. In addition, case 1
A hollow bobbin 11 whose outer circumference follows the inner circumference of the case 10 is disposed inside the case 10, and a secondary coil 12 is wound around the bobbin 11.
The battery 6, which is a circuit part, and the load 7 are formed in the hollow part of the bobbin 11.
etc. are arranged, and the secondary side component 13 is arranged from the bobbin 11, the secondary coil 12, the diode 5, the battery 6, and the load 7.
This is the point in which this was constructed.

(G) Effects of the invention As mentioned above, the electromagnetic coupling type charging device according to the invention is formed by winding the secondary coil around the bobbin in a shape along the inner circumference of the case, so that misalignment of both coils is suppressed. Even if the case is made of highly safe metal, the voltage across the primary coil is approximately proportional to the charging current, allowing accurate detection and improving the degree of electromagnetic coupling during charging. Also,
Since circuit parts such as a battery, a rectifier circuit, and a load are disposed within the hollow bobbin, various effects can be achieved, such as being able to improve the packaging density of the circuit parts.

[Brief explanation of the drawing]

1 and 2 show a conventional electromagnetic coupling type charging device, Fig. 1 is a wiring diagram, Fig. 2 is a cutaway front view, and Fig. 3 and the following drawings are one example of an electromagnetic coupling type charging device of this invention. An example is shown, and FIG. 3 is a cut front view,
FIG. 4 is a cutaway plan view. 1...AC power supply, 2...Primary coil, 3...High frequency transmission transformer, 6...Battery, 7...Load, 1
0...Metal case, 11...Bobbin, 12...2
Secondary coil, 13...Secondary side component.

Claims (1)

[Scope of utility model registration request] A primary side component consisting of an AC power source and a primary coil connected to the power source, a metal case separably provided in the primary side component, and a hollow bobbin disposed within the case. , a secondary side configuration consisting of a secondary coil wound around the bobbin in a shape along the inner circumference of the case and provided so as to be electromagnetically coupled to the primary coil, and a circuit section disposed in the hollow space; An electromagnetic coupling type charging device equipped with a