JPH10215530A - Non-contact power transmission device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To promote safety in power transmission because non-contact power transmission operation from a power supply member is not made to a member other than a power supplied member corresponding thereto. SOLUTION: A non-contact power transmission device is equipped with a power supply member 1, having a primary coil 2 to which power is applied, and a power supplied member 3 having a secondary coil 4 capable of loading and unloading to the power supply member 1 and put in the magnetic field with the primary coil 2 in the case it is loaded to the power supply member 1. The power supply member 1 detects the loading of the power supplied member 3 to the power supply member 1 and is equipped with a load detection control circuit 13 for starting a non-contact power transmission to the power supplied member 3. Non-contact power transmission operation is not made under a state such that the power supplied member 3 as a normal load is not loaded.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a non-conductive coil provided on a power supply side member to which electric power is applied and a guided coil provided on a power supplied side member and placed in a magnetic field generated by the induction coil. The present invention relates to a contact power transmission device.

[0002]

2. Description of the Related Art A non-contact power transmission device transfers a power by electromagnetic induction to a secondary coil by positioning a secondary coil in a magnetic field generated by applying a high frequency to a primary coil. Since an insulator can be interposed between the coil and the secondary coil, power can be transmitted without exposing the charged portion to the outside,
It can be suitably used in those requiring a waterproof structure.

FIG. 26 shows an example. The power-supplied member 3 is a waterproof electric razor, and a secondary coil 4 is connected to a secondary battery 30 that supplies power to a motor drive circuit via a rectifier. On the other hand, the power supply side member 1 incorporates an inverter 11 for generating a high frequency from a DC obtained by rectifying and smoothing a commercial power supply and a primary coil 2 to which the high frequency is applied. The member 3 is placed, the primary coil 2 and the secondary coil 4 face each other, and the non-contact power transmission from the power supply side member 1 to the power supply side member 3 causes the secondary battery 3
0 is charged. That is, the power supply side member 3 constitutes a charger.

[0004]

By the way, in this type of conventional power transmission device, when the power supply side member 1 is connected to the power supply, the high frequency current is always supplied to the primary coil 2. As shown in FIG. 27, when the metallic foreign matter 7 is placed in the vicinity of the primary coil 2, an eddy current flows through the metallic foreign matter due to the linkage of the magnetic flux, and the metallic foreign matter 7 enters an induction heating state.
It is extremely dangerous because it generates heat rapidly.

SUMMARY OF THE INVENTION The present invention has been made in view of such a point, and an object of the present invention is to perform a non-contact power transmission operation from a power supply side member to a member other than a corresponding power supply side member. An object of the present invention is to provide a non-contact power transmission device with high safety.

[0006]

According to the present invention, there is provided a power supply side member having a primary coil to which electric power is applied, the power supply side member being detachable from the power supply side member and being attached to the power supply side member. In a non-contact power transmission device including a power-supplied member provided with a secondary coil placed in a magnetic field generated by a coil, the power-supplied member detects the attachment of the power-supplied member to the power-supplied member and detects the power-supplied member. It is characterized in that a load detection control circuit for starting non-contact power transmission to members is provided. The non-contact power transmission operation is not performed in a state where the power-supplied-side member as the regular load is not mounted.

If the start of the non-contact power transmission at this time is performed by switching from the intermittent oscillation state to the continuous oscillation state of the power supply side member, the load detection operation becomes easy, and particularly, the power supply side member at the time of intermittent oscillation. When the attachment of the power-supply-side member is detected by detecting the weak noise by the non-linear element or the like, the configuration can be simplified. The load detection control circuit may include a dedicated oscillating unit and a receiving unit.In this case, even if both the oscillating unit and the receiving unit are provided on the power supply side member, the oscillating unit is provided on the power supply side member, The receiving means may be provided on the power supply side member.

When oscillating means is provided on the member to be fed,
It is preferable that the oscillating means obtains power by non-contact power transmission from the power supply side member. In this case, the reception means of the power supply side member detects a signal from the oscillating means of the power supply side member and performs the non-contact power transmission. It is good to make it a continuation state. The oscillating means of the power-supplied-side member and the receiving means of the power-supplied-side member may mutually exchange information.

A switch for detecting the attachment of the power-supplied member to the power-supplying member may be used in combination. The antenna included in the load detection control circuit may use a primary coil. Also, the antenna of the load detection control circuit should be placed in a position where it will not receive induction of the magnetic field generated by the power transmission coil,
For example, it is preferable to provide the coil antenna outside or inside the magnetic field loop formed by the power transmission coil. The coil antenna may be provided on a surface parallel to the magnetic field lines formed by the power transmission coil.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described. In FIG. 1, an inverter 11 generates a high-frequency current from a DC power supply 10 and applies it to a primary coil 2.
Is connected to an intermittent oscillation control circuit 12 that causes the inverter 11 to operate intermittently. Further, a load detection circuit 13 having an antenna coil 17 wound around a core of the primary coil 2 is provided, and the operation of the intermittent oscillation control circuit 12 is switched by the output of the load detection circuit 13. In the drawing, reference numeral 3 denotes a power-supplied member that incorporates the secondary coil 4 and charges the secondary battery 30 with electric power transmitted by non-contact power transmission.

In this wireless power transmission device, the inverter 11 is normally controlled by the intermittent oscillation control circuit 12.
Indicates that the high-frequency current is intermittently applied to the primary coil 2 as shown in FIG.
Is applied. A in FIG. 3 indicates a period during which no load or a foreign object is loaded, and B indicates a period during which a normal load is connected.
It is preferable that the time during which the high frequency is applied to the primary coil 2 during the intermittent oscillation is considerably shorter than the time during which no high frequency is applied, as shown in FIG. It is not limited to what is shown.

Here, when the normal power-supplying-side member 3 is not mounted on the power-supplying-side member 1, that is, when there is no load or a metal foreign object is placed, the detection circuit signal of the load detection circuit 13 is detected. Vs hardly appears, but when the regular power-supplied member 3 is mounted, the power-supplied member 3
A weak noise is generated as a harmonic component from a non-linear element such as a rectifier diode on the side. Since the detection circuit signal Vs as high-frequency AC flows through the antenna coil 17 to the load detection circuit 13 through the antenna coil 17, the noise is detected and output to the intermittent oscillation control circuit 12, thereby shifting the inverter 11 to the continuous oscillation state. . That is, when the regular power-supplied member 3 is not connected, only the intermittent oscillation is performed. However, when the regular power-supplied member 3 is connected, this is detected and the operation proceeds to the continuous oscillation operation. This starts the non-contact power transmission operation. FIG. 2 shows a flowchart of the above operation.

FIG. 4 shows that the antenna coil 17 is also used as the primary coil 2 for power transmission, and the load detecting circuit 1 is used.
FIG. 5 shows an example in which the antenna coil 17 is also used as the primary coil 2 for power transmission, and the load detection circuit 13 is switched by the inverter 11. The figure shows an input from the voltage of the element. In any case, the load detection operation is continuously performed during the non-contact power transmission operation, and when the regular power-supplied member 3 is detached, the non-contact power transmission operation is interrupted, and the operation shifts to the intermittent oscillation operation again. Instead of the intermittent oscillation operation, when the power switch of the power supply-side member 1 is turned on, the inverter 11 operates for a short time to perform the above load detection operation, and when it is detected that a compatible load is not connected, The above load detection operation may not be performed unless the power switch is turned on again.

FIG. 6 shows an example of another embodiment. Here, a signal oscillation circuit 15, an oscillation antenna coil 16, a reception antenna coil 17, and a load detection circuit 13 are provided on the power supply side member 1. The signal oscillation circuit 15 adds the signal oscillation output Vh shown in FIG.
For this reason, if there is no load when the normal power-supplying-side member 3 is not connected, since the detection circuit signal Vs of a predetermined level or more flows to the load detection circuit 13, the inverter 1
1 is stopped, but when the legitimate power-supplied member 3 is mounted, the detection circuit signal Vs has a required attenuation. The inverter 11 is started to shift to the non-contact power transmission operation. Further, when a metal foreign substance or the like is placed, the detection circuit signal Vs is further attenuated as compared with the case of a normal load, so that the inverter 11 is kept stopped. As shown in FIG. 8, the antenna coil 16 may be used for both oscillation and reception.

Since the inverter 11 does not operate at all when the regular power-supplied member 3 is not mounted, the safety is higher than that of the above-described embodiment. Since the signal Vh output through the antenna coil 16 may be weak, power consumption when the non-contact power transmission operation is not performed can be suppressed.

FIG. 9 shows an example of another embodiment. Here, a signal oscillation circuit 32 and an oscillation antenna coil 33 are provided on the power-supplied member 3, and a power supply unit 31 that supplies power to the signal oscillation circuit 32 from electric power received by non-contact power transmission through the secondary coil 4 is provided. ing. The power supply side member 1 is provided with a load detection circuit 13 and an intermittent oscillation control circuit 12 in the same manner as shown in FIG.

As shown in FIG. 11, when the normal power-supplied member 3 is not connected, the load detection signal Vs does not flow even when the inverter 11 of the power-supplying member 1 intermittently oscillates, or the load detection signal Vs is different from the normal one. However, when the power-supplied member 3 is connected, the signal oscillation circuit 32 of the power-supplied member 3 operates to oscillate a signal Vh of a specific frequency by contactless power transmission during the intermittent oscillation operation of the inverter 11. As a result, a predetermined load detection signal Vs is obtained at the power supply side member 1, and for this purpose, the inverter 11 shifts to a continuous oscillation operation and performs non-contact power transmission. FIG. 10 is a flowchart of the above operation.

In this case, if the signal Vh output from the signal oscillation circuit 32 includes the identification signal unique to the power-supplied member 3, the state of connection of the normal load can be detected with higher accuracy. In addition, since information can be transmitted and received between the power supply side member 1 and the power supply side member 2, not only load detection but also more sophisticated control can be realized.

FIG. 12 shows an example of still another embodiment.
FIG. 13 shows a flowchart of the operation. Here, the magnet 6 is provided on the power supply side member 3 and the power supply side member 1 is provided.
Is provided with a magnet switch 5 for detecting a load, and both members 1 and 3 are provided with transmission / reception circuits 18 and 34 for mutually transmitting and receiving information. When the power-supplied member 3 is attached to the power-supplied member 1, the magnet 11 turns on when the magnet switch 5 is turned on by the magnet 6, and the wireless power transmission to the power-supplied member 3 is started.
The receiving / transmitting circuit 34 of the power-supplied member 3 and the power-supplying member
The transmission / reception circuit 18 transmits and receives an information signal. At this time, if the transmission / reception circuit 18 cannot receive the original signal, the inverter 11 is stopped through the transmission control circuit 12 to stop the operation. Then, the non-contact power transmission operation is stopped. Even if the magnet switch 5 is actuated by a magnetized foreign substance, a non-contact power transmission operation is not continued, so that a highly safe switch can be obtained.

With respect to the arrangement of the primary coil 2 and the receiving or oscillating antenna coil 16, as shown in FIG. 14, when a magnetic field line generated when a current flows through the primary coil 2 passes through the antenna coil 16, 16 outputs a voltage superimposed on the original load detection signal Vs, making it difficult to detect the load detection signal Vs.
For this purpose, as shown in FIG.
May be disposed outside the magnetic field line loop, or may be disposed inside the magnetic field line loop as shown in FIG. Since the change in magnetic flux created by the power transmission coils 2 and 4 is canceled out, the antenna coil 16 receives the original load detection signal Vs
Can only receive (transmit). 20 and 4 in the figure
0 is a core.

As shown in FIG. 18, the antenna coil 16 is arranged so that the axial direction of the primary coil 2 and the secondary coil 4 is orthogonal to the axial direction of the antenna coil 16, and the magnetic lines of force created by the coils 2 and 4 The antenna coil 16 may be located on a parallel surface. The antenna coil 16 is not affected by the lines of magnetic force generated in the power transmission coils 2 and 4.

FIG. 19 shows a non-contact power transmission coil 2.
FIG. 20 shows the case where the arrangement of the oscillating and receiving antenna coils 17 and 16 is outside the line of magnetic force when the cores 20 and 40 of the 4, 24 compose the CC type. FIG. 21 shows a case where the arrangement is outside the magnetic field line loop, and FIG.
The case where the arrangement of the antenna coils 33 and 16 is outside the line of magnetic force when the 4, 20 cores 20 and 40 constitute the CI type is shown.

FIG. 22 shows that the axial directions of the primary coil 2 having a cylindrical core and the secondary coil 4 which is an air-core coil are orthogonal to the axial directions of the antenna coils 16 and 33, and the lines of magnetic force generated by the coils 2 and 4 are perpendicular to each other. Antenna coil 16, on a plane parallel to
33, and the antenna coils 16, 33
Antenna coils 16 and 33 so that their axial directions are the same.
Is shown.

FIG. 23 is a diagram in which the coils 2 and 4 are wound around each leg of the CC-type cores 20 and 40, and the antenna coils 33 and 16 are arranged outside the lines of magnetic force by the coils 2 and 4. 24 is the core 20, 4 on the pot core side
In the case of performing non-contact power transmission by the coils 2 and 4 having 0, the coils 2, 4
Antenna coils 33 and 16
Are shown. FIG. 25 shows an arrangement in which the antenna coils 33 and 16 are arranged outside the magnetic field loop formed by the coils 2 and 4 having the EE-type cores 20 and 40.

[0025]

As described above, according to the present invention, the load detection control circuit for detecting the attachment of the power-supplied member to the power-supplying member and starting the non-contact power transmission to the power-supplied member is provided. To prevent the non-contact power transmission operation from being performed in a state where the power-supplied member as the normal load is not mounted. Has high safety without being heated.

At this time, the non-contact power transmission is started by switching the intermittent oscillation state from the intermittent oscillation state to the continuous oscillation state of the power supply side member. That is, when the load is detected at the time of intermittent oscillation, the load detection operation becomes easy. And periodically. In particular, when the attachment of the power-supplied member is detected by detecting the weak noise due to the non-linear element of the power-supplied member at the time of the intermittent oscillation, the configuration can be simplified.

The load detection control circuit may include a dedicated oscillating means and a receiving means. In this case, more accurate load detection can be performed. When both the oscillating means and the receiving means are provided on the power supply side member, there is no need to intermittently supply a current to the primary coil.
The current consumption when the power-supplied-side member is not mounted can be reduced.

The oscillating means may be provided on the power-supplied member, and the receiving means may be provided on the power-supplied member. In this case, it is possible to reliably detect only the mounting of the adapted power-supplied member. When oscillating means is provided on the power-supplied member, if the oscillating means obtains power by non-contact power transmission from the power-supplying member, there is no need to provide a battery power supply on the power-supplied member, and the battery power is consumed. The detection failure does not occur. Then, the signal from the oscillation unit of the power-supplied-side member is detected by the receiving unit of the power-supplying-side member, and the non-contact power transmission is continued, so that the transition to the power transmission state can be smoothly performed.

The oscillating means of the power-supplied member and the receiving means of the power-supplied member may mutually exchange information.
It is possible to more accurately determine whether or not the mounted power-supplied-side member is suitable, and it is also possible to perform finer control of non-contact power transmission. Further, a switch for detecting the attachment of the power-supplied-side member to the power-supply-side member may be used together. Since the operation for detecting whether or not the power-supplied-side member is mounted can be performed by operating the switch, it is not necessary to constantly operate the intermittent oscillation operation or the oscillation unit.

The antenna provided in the load detection control circuit includes:
The use of the primary coil can reduce the number of components. Also, the antenna of the load detection control circuit should be placed in a position where it will not receive induction of the magnetic field generated by the power transmission coil,
For example, by providing a coil antenna outside or inside a magnetic field line loop made by a power transmission coil, or by providing a coil antenna on a surface parallel to a magnetic field line made by a power transmission coil, Load detection can be performed without being affected by a magnetic field.

[Brief description of the drawings]

FIG. 1 is a circuit diagram of an example of an embodiment of the present invention.

FIG. 2 is a flowchart showing the operation of the above.

FIG. 3 is a time chart showing the operation of the above.

FIG. 4 is a circuit diagram of another example of the above.

FIG. 5 is a circuit diagram of still another example of the above.

FIG. 6 is a circuit diagram of another example of the above.

FIG. 7 is a time chart showing the operation of the above.

FIG. 8 is a circuit diagram of still another example of the above.

FIG. 9 is a circuit diagram of an example of another embodiment.

FIG. 10 is a flowchart showing the operation of the above.

FIG. 11 is a time chart showing the operation of the above.

FIG. 12 is a circuit diagram illustrating an example of another embodiment.

FIG. 13 is a flowchart showing the operation of the above.

FIG. 14 is a perspective view showing an example of an arrangement of an electromagnetic induction coil and an antenna coil.

FIG. 15 is a perspective view showing another example of the same arrangement.

FIG. 16 is a perspective view showing still another example of the same arrangement.

FIG. 17 is a perspective view showing another example of the same arrangement.

FIG. 18 is a perspective view showing a different example of the same arrangement.

FIG. 19 is a perspective view showing still another example of the same arrangement.

FIG. 20 is a perspective view showing another example of the above arrangement.

FIG. 21 is a perspective view showing still another example of the same arrangement.

FIG. 22 is a perspective view showing another example of the same arrangement.

FIG. 23 is a perspective view showing still another example of the same arrangement.

FIG. 24 is a perspective view showing a different example of the same arrangement.

FIG. 25 is a perspective view showing still another example of the same arrangement.

FIG. 26 is an explanatory diagram illustrating a schematic configuration of an example of an electromagnetic induction type wireless power transmission device.

FIG. 27 is an explanatory diagram showing the above problem.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Power supply side member 2 Primary coil 3 Power supply side member 4 Secondary coil 13 Load detection circuit

Claims (14)

[Claims] A power supply side member having a primary coil to which power is applied, and a secondary coil detachable from the power supply side member and placed in a magnetic field by the primary coil when the power supply side member is attached to the power supply side member. In the non-contact power transmission device including the power-supplied-side member provided with the power-supply-side member, the power-supply-side member detects the attachment of the power-supplied-side member to the power-supply-side member and starts the non-contact power transmission to the power-supplied-side member. A wireless power transmission device comprising a load detection control circuit. 2. The non-contact power transmission according to claim 1, wherein the power supply-side member starts non-contact power transmission to the power-supplied side member by switching from an intermittent oscillation state to a continuous oscillation state. apparatus. 3. The load detection control circuit according to claim 2, wherein the load detection control circuit detects the mounting of the power supply-side member by detecting a weak noise caused by a nonlinear element or the like of the power-supply-side member during intermittent oscillation. Non-contact power transmission device. 4. The wireless power transmission device according to claim 1, wherein the load detection control circuit includes a dedicated oscillating unit and a receiving unit. 5. The non-contact power transmission device according to claim 4, wherein both the oscillating means and the receiving means are provided on the power supply side member. 6. The power supply side member, wherein the oscillating means is provided on the power supply side member, and the receiving means is provided on the power supply side member.
The wireless power transmission device according to claim 1. 7. The non-contact power transmission device according to claim 6, wherein the oscillating means of the power-supplied-side member obtains power by non-contact power transmission from the power-supply-side member. 8. The non-contact power supply according to claim 7, wherein a signal from the oscillating means of the power supply-side member is detected by a receiving means of the power supply-side member, and non-contact power transmission is continued. Power transmission device. 9. The non-contact power transmission according to claim 6, wherein the oscillating means of the power-supplied member and the receiving means of the power-supplied member exchange information mutually. apparatus. 10. The non-contact power transmission device according to claim 6, wherein a switch for detecting the attachment of the power-supplied-side member to the power-supplying-side member is also used. 11. The non-contact power transmission device according to claim 1, wherein the load detection control circuit has an antenna and uses a primary coil as the antenna. 12. The load detection control circuit according to claim 1, further comprising an antenna, wherein the antenna is disposed at a position where the antenna does not receive induction of a magnetic field generated by the power transmission coil. Non-contact power transmission device according to the item. 13. The non-contact electric power according to claim 12, wherein the load detection control circuit includes a coil antenna, and the coil antenna is provided outside or inside a magnetic field loop formed by the power transmission coil. Transmission equipment. 14. The non-contact power transmission according to claim 12, wherein the load detection control circuit includes a coil antenna, and the coil antenna is provided on a surface parallel to a magnetic field line formed by the power transmission coil. apparatus.