JP6305517B2 - Resonant power transmission device - Google Patents

Description

  The present invention relates to a resonance type power transmission device that performs power transmission by resonance.

  Conventionally, as shown in FIG. 16, a resonance type power transmission apparatus is known that uses a variable impedance element 101 to change the resonance frequency of a transmission / reception antenna (see, for example, Patent Document 1). Accordingly, it is possible to cope with a case where the resonance frequency of the transmission / reception antenna deviates from a design value due to manufacturing variation or an external environment, or when it is desired to change the frequency to be transmitted in the KHz band.

JP 2013-226041 A

Here, in the prior art disclosed in Patent Document 1, the transmission / reception antenna includes a feeding loop antenna 102 and a resonance coil 103, and the resonance frequency can be varied by loading the variable impedance element 101 on the feeding loop antenna 102. It is said. However, the self-resonant frequency of the resonance coil 103 is fixed. Therefore, the variable frequency range is limited, and there is a problem that it cannot be varied in a wide frequency range from the KHz band to the MHz band.
Therefore, conventionally, when the resonance frequency of the transmission / reception antenna is changed in the range from the KHz band to the MHz band, it is necessary to replace the antenna with a dedicated antenna for each frequency band, leading to an increase in the cost of the apparatus. In addition, since the housing design corresponding to the antenna replacement is performed, there is a problem that the apparatus cannot be reduced in size and weight.

  The present invention has been made in order to solve the above-described problems. Resonance type power that can change the resonance frequency in the range from KHz band to MHz band without replacing with an antenna dedicated to each frequency band. An object of the present invention is to provide a transmission device, a transmission-side power transmission device, and a reception-side power transmission device.

The resonant power transmission device according to the present invention includes a resonant transmission antenna whose inductance value is variable by switching a coil length, a transmission-side capacitor connected in series to the transmission antenna, and a coil length that is switched. Resonance type receiving antenna that receives power from the transmitting antenna with variable inductance value, receiving side capacitor connected in series to the receiving antenna, and variable that switches the resonance frequency by switching the coil length of the transmitting antenna and the receiving antenna A control circuit and a power detection circuit for detecting a leakage of power from the own device to another resonance type power transmission device or a leakage of power from another resonance type power transmission device to the own device , a transmission antenna and a reception antenna Makes it possible to switch the coil length so as to switch the resonance frequency in the range of KHz band to MHz band, If the power of the leakage is detected by the force detection circuit is intended to switch the resonant frequency and the resonant frequency of the reception antennas of the transmitting antennas to the same other frequencies.

  According to the present invention, since it is configured as described above, the resonance frequency can be made variable in a range from the KHz band to the MHz band without replacing with an antenna dedicated to each frequency band.

It is a figure which shows the structure of the resonance type power transmission apparatus which concerns on Embodiment 1 of this invention. It is a figure which shows the switching operation | movement of the resonant frequency of the resonance type power transmission apparatus which concerns on Embodiment 1 of this invention. It is a figure which shows another structure of the resonance type power transmission apparatus which concerns on Embodiment 1 of this invention. It is a figure which shows the structure of the resonance type power transmission apparatus which concerns on Embodiment 2 of this invention. It is a figure which shows the structure of the variable inductor in Embodiment 2 of this invention. It is a figure which shows the structure of the variable inductor in Embodiment 2 of this invention. It is a figure which shows the structure of the variable inductor in Embodiment 2 of this invention. It is a figure which shows the structure of the variable capacitor in Embodiment 2 of this invention. It is a figure which shows the structure of the resonance type power transmission apparatus which concerns on Embodiment 3 of this invention. It is a figure which shows the structure of the resonance type power transmission apparatus which concerns on Embodiment 4 of this invention. It is a figure which shows the switching operation | movement of the resonant frequency of the resonance type power transmission apparatus which concerns on Embodiment 4 of this invention. It is a figure which shows another switching operation | movement of the resonant frequency of the resonance type power transmission apparatus which concerns on Embodiment 4 of this invention. It is a figure which shows another switching operation | movement of the resonant frequency of the resonance type power transmission apparatus which concerns on Embodiment 4 of this invention. It is a figure which shows the structure of the resonance type power transmission apparatus which concerns on Embodiment 5 of this invention. It is a figure which shows the structure of the resonance type power transmission apparatus which concerns on Embodiment 6 of this invention. It is a figure which shows the structure of the conventional resonance type power transmission apparatus.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
Embodiment 1 FIG.
1 is a diagram showing a configuration of a resonant power transmission apparatus according to Embodiment 1 of the present invention.
As shown in FIG. 1, the resonant power transmission apparatus includes a transmission power supply circuit 11, a capacitor (transmission side capacitor) 12, a transmission antenna 13, a variable control circuit 14, a reception antenna 21, a capacitor (reception side capacitor) 22, and variable control. The circuit 23 and the reception power circuit 24 are configured. The transmission power circuit 11, the capacitor 12, the transmission antenna 13 and the variable control circuit 14 constitute a transmission side power transmission device, and the reception antenna 21, capacitor 22, variable control circuit 23 and reception power circuit 24 are the reception side power transmission device. Configure.

The transmission power supply circuit 11 controls the supply of power to the transmission antenna 13.
The capacitor 12 is a variable capacitor whose capacitance value is variable by a switch (SW), and adjusts the resonance frequency of the transmission antenna 13. Note that examples of the switch include a relay, a transistor, and a photocoupler. Further, the figure shows the case where the capacitor 12 is connected to both the hot side and the return side of the circuit, but the capacitor 12 may be provided on only one of them.

  The transmission antenna 13 is composed of a variable inductor whose inductance value is variable by switching the coil length by a switch (SW), and is a resonance-type power transmission antenna that transmits power from the transmission power supply circuit 11 to the reception antenna 21. (Not limited to non-contact). The transmission antenna 13 receives the alternating current (V1) output from the transmission power supply circuit 11, performs a resonance operation, generates transmission power, and performs power transmission to the reception antenna 21. Note that examples of the switch include a relay, a transistor, and a photocoupler.

  Here, the capacitance value of the capacitor 12 and the inductance value of the transmission antenna 13 are set to values that can switch the resonance frequency of the transmission antenna 13 in the range from the KHz band to the MHz band by a switch. Here, the resonance frequency f0 is represented by a relational expression of f0 = 1 / 2π√ (LC). That is, when the resonance frequency f0 is set high, the inductance value L and the capacitance value C are reduced. On the other hand, when the resonance frequency f0 is set low, the inductance value L and the capacitance value C are increased.

  The variable control circuit 14 switches the resonance frequency of the transmission antenna 13 by controlling the switching operation of the switch of the capacitor 12 and the switch of the transmission antenna 13. The variable control circuit 14 may be configured to be executed by program processing using a CPU based on software.

  The receiving antenna 21 is composed of a variable inductor whose inductance value is variable by changing a coil length by a switch (SW), and is a resonance type power receiving antenna that receives power from the transmitting antenna 13 (non-contact type). Not limited to). Note that examples of the switch include a relay, a transistor, and a photocoupler. The power received by the receiving antenna 21 is supplied to a load device or the like (not shown) via the receiving power circuit 24.

  The capacitor 22 is a variable capacitor whose capacitance value is variable by a switch (SW), and adjusts the resonance frequency of the receiving antenna 21. Note that examples of the switch include a relay, a transistor, and a photocoupler. Moreover, although the figure shows the case where the capacitor 22 is connected to both the hot side and the return side of the circuit, the capacitor 22 may be provided only on either one.

  Here, the capacitance value of the capacitor 22 and the inductance value of the reception antenna 21 are set to values at which the resonance frequency of the reception antenna 21 can be switched in the range from the KHz band to the MHz band by a switch. That is, when the resonance frequency f0 is set high, the inductance value L and the capacitance value C are reduced. On the other hand, when the resonance frequency f0 is set low, the inductance value L and the capacitance value C are increased. Note that the resonance frequency of the reception antenna 21 is set to the same resonance frequency as that of the transmission antenna 13.

The variable control circuit 23 switches the resonance frequency of the receiving antenna 21 by controlling the switching operation of the switch of the capacitor 22 and the switch of the receiving antenna 21. The variable control circuit 23 may be configured to be executed by program processing using a CPU based on software.
The reception power supply circuit 24 is disposed between the reception antenna 21 and the load device, and rectifies power (AC output) received by the reception antenna 21.

Note that the transmission method of the resonant power transmission apparatus in the case of wireless power transmission is not particularly limited, and any of a magnetic field resonance method, an electric field resonance method, and an electromagnetic induction method may be used.
In FIG. 1, a non-contact type resonance power transmission device is assumed and the variable control circuits 14 and 23 are separately provided on the transmission and reception sides, but may be shared.

Next, the switching operation of the resonance frequency by the resonance type power transmission device configured as described above will be described with reference to FIG. Hereinafter, a case where the resonance frequency is switched between two patterns of the KHz band and the MHz band will be described.
When the resonant frequency of the resonant power transmission apparatus is set to the KHz band, the variable control circuits 14 and 23 are configured such that the coil lengths of the transmitting and receiving antennas 13 and 21 become longer as shown in FIG. In the example of 2 (a), the switch is switched so that the number of turns is 2), and the switch is switched so that the number of connections of the capacitors 12 and 22 is increased. As a result, the inductance value and the capacitance value can be increased, and the resonance frequency can be set in the KHz band.

  On the other hand, when the resonance frequency of the resonant power transmission apparatus is set to the MHz band, the variable control circuits 14 and 23 are configured so that the coil lengths of the transmission / reception antennas 13 and 21 are shortened as shown in FIG. The switch is switched so that the number of turns is 1 in the example of FIG. 2B, and the switch is switched so that the number of connections of the capacitors 12 and 22 is reduced. Thereby, the inductance value and the capacitance value can be reduced, and the resonance frequency can be set in the MHz band.

  In the above, the case where the resonance frequency is switched to two patterns in the range from the KHz band to the MHz band has been described. However, the present invention is not limited to this, and a switch may be provided to switch to three or more patterns.

  Moreover, although the case where a variable type capacitor was used as the capacitors 12 and 22 was shown above, a capacitor with a fixed capacitance value may be used. In this case, the variable control circuits 14 and 23 switch only the coil lengths of the transmission / reception antennas 13 and 21 to switch the resonance frequency.

In the above description, it is assumed that the operator operates the variable control circuits 14 and 23 to switch the resonance frequency. On the other hand, for example, a transmission-side power transmission device set to a resonance frequency in the MHz band is provided, and when the reception-side power transmission device of the present invention is brought close to this, the reception-side resonance frequency is automatically set to the MHz band. The power transmission may be performed by switching to the above.
In this case, as shown in FIG. 3, a power detection circuit 25 that detects transmission of power from the outside (transmission side power transmission device) is added to the reception side power transmission device. The variable control circuit 23 switches the resonance frequency of the reception antenna 21 until the power detection circuit 25 detects power.

  FIG. 3 shows a configuration in which the power detection circuit 25 is provided in the reception-side power transmission device and the resonance frequency of the reception antenna 21 is automatically switched. On the other hand, a power detection circuit may be provided in the transmission-side power transmission device, and the transmission antenna 13 may be automatically switched.

As described above, according to the first embodiment, the shape of the transmitting / receiving antennas (resonant coils) 13 and 21 itself is deformed, and the variable impedance elements (capacitors 12 and 22) are loaded to vary the resonance frequency. Therefore, the resonance frequency can be made variable in the range from the KHz band to the MHz band without replacing with an antenna dedicated to each frequency band. This eliminates the need for a conventional antenna dedicated to each frequency band, thereby reducing costs. In addition, since the antenna need not be replaced, the apparatus can be reduced in size and weight.
The present invention can be used as a device that can handle wireless power transmission in the KHz band of the Qi standard and wireless power transmission in the MHz band that is expected to be widely used in the future. is there.

Embodiment 2. FIG.
FIG. 4 is a diagram showing a configuration of a resonant power transmission apparatus according to Embodiment 2 of the present invention. 4 is obtained by adding variable inductors (variable impedance elements) L11 and L21 to the resonant power transmission apparatus according to the first embodiment shown in FIG. . Other configurations are the same, and the same reference numerals are given and description thereof is omitted.

The variable inductor (transmission-side variable impedance element) L11 is an element that is connected in series to the transmission antenna 13 and has an inductance value that is variable by electronic components. The variable inductor (reception-side variable impedance element) L21 is an element that is connected in series to the reception antenna 21 and has an inductance value that is variable by electronic components.
The variable control circuit 14 controls the inductance value of the variable inductor L11 by controlling the electronic component in addition to the function of the first embodiment. In addition to the function of the first embodiment, the variable control circuit 23 controls the inductance value of the variable inductor L21 by controlling the electronic component.
The resonance frequency can be finely adjusted by the variable inductors L11 and L21.

Next, configuration examples of the variable inductors L11 and L21 will be described with reference to FIGS.
FIG. 5 shows a variable inductor of a type in which a motor control circuit 201 is used as an electronic component, and the magnetic path length of the coil 202 is automatically changed by the motor control circuit 201. In this configuration, the variable control circuits 14 and 23 drive the motor control circuit 201 to physically vary the magnetic path length of the coil 202, thereby varying the inductance value (L value). 5A and 5B, the number of turns of the coil 202 is the same.

  FIG. 6 shows a variable inductor of a type in which a switch 203 such as a relay, transistor, or photocoupler is used as an electronic component, and the parallel connection of the coil 202 is automatically changed by the switch 203. In this configuration, the switch 203 is connected to the coils 202 connected in parallel, and the variable control circuits 14 and 23 are used to switch the ON / OFF of the switches 203, or the pulse width modulation (PWM) or the like is switched. The inductance value can be varied by varying the parallel connection.

  FIG. 7 shows a variable inductor that uses a switch 203 such as a relay, transistor, or photocoupler as an electronic component and automatically adjusts the number of turns of the coil 202 by the switch 203. In this configuration, the switch 203 is connected to each winding point of the coil 202, and the variable control circuits 14 and 23 are used to switch each switch 203 ON / OFF, or by switching the pulse width modulation (PWM) or the like. The inductance value is varied by varying the number of turns.

Although FIG. 4 shows the case where the variable inductors L11 and L21 are used as the variable impedance elements, for example, a variable capacitor having a variable capacitance value as shown in FIG. 8 may be used to obtain the same effect. Can do.
FIG. 8 shows a variable capacitor of a type in which a switch 204 such as a relay, transistor, or photocoupler is used as an electronic component, and the parallel connection of the capacitor 205 is automatically changed by the switch 204. In this configuration, the switch 204 is connected to each capacitor 205 connected in parallel, and the variable control circuits 14 and 23 are used to switch each switch 204 ON / OFF, or by switching pulse width modulation (PWM) or the like. By changing the parallel connection, the capacitance value is changed.

  As described above, according to the second embodiment, since the variable impedance element is connected in series to the transmission / reception antennas 13 and 21, in addition to the effects of the first embodiment, the resonance of the transmission / reception antennas 13 and 21 is achieved. The frequency can be finely adjusted.

Embodiment 3 FIG.
FIG. 9 is a diagram showing a configuration of a resonant power transmission apparatus according to Embodiment 3 of the present invention. In the resonant power transmission apparatus according to the third embodiment shown in FIG. 9, variable capacitors (variable impedance elements) C12, C13, C22, and C23 are added to the resonant power transmission apparatus according to the second embodiment shown in FIG. It is a thing. Other configurations are the same, and the same reference numerals are given and description thereof is omitted.

The variable capacitors (transmission-side variable impedance elements) C12 and C13 are elements that are connected in parallel to the transmission antenna 13 and have variable capacitance values by electronic components. The variable capacitors (reception-side variable impedance elements) C22 and C23 are elements that are connected in parallel to the reception antenna 21 and have variable capacitance values by electronic components. In addition, as a configuration example of the variable capacitors C12, C13, C22, and C23, the configuration illustrated in FIG.
The variable control circuit 14 controls the capacitance values of the variable capacitors C12 and C13 by controlling the electronic components in addition to the function of the second embodiment. The variable control circuit 23 controls the capacitance values of the variable capacitors C22 and C23 by controlling the electronic components in addition to the function of the second embodiment.

  The π-type circuit including the variable capacitors C12, C13, C22, and C23 and the variable inductors L11 and L21 can finely adjust the resonance frequency and can perform impedance matching.

Although FIG. 9 shows the case where variable capacitors C12, C13, C22, and C23 are connected in parallel to the transmission / reception antennas 13 and 21, a variable inductor may be connected in parallel to the transmission / reception antennas 13 and 21. An effect can be obtained.
FIG. 9 shows the case where the variable inductors L11 and L21 are also connected in series to the transmitting and receiving antennas 13 and 21 to form a π-type circuit. However, the variable inductors L11 and L21 are not essential and need not be provided. Good.

Embodiment 4 FIG.
FIG. 10 is a diagram showing a configuration of a resonant power transmission apparatus according to Embodiment 4 of the present invention. The resonant power transmission apparatus according to the fourth embodiment shown in FIG. 10 is obtained by adding power detection circuits 15 and 26 to the resonant power transmission apparatus according to the first embodiment shown in FIG. Other configurations are the same, and the same reference numerals are given and description thereof is omitted.

The power detection circuit 15 detects leakage of power from the own device or leakage of power from the outside. A signal indicating the detection result by the power detection circuit 15 is output to the variable control circuit 14. The power detection circuit 26 detects leakage of power from its own device or leakage of power from the outside. A signal indicating the detection result by the power detection circuit 26 is output to the variable control circuit 23.
In addition to the function in the first embodiment, the variable control circuit 14 switches the resonance frequency of the transmission antenna 13 when power leakage is detected by the power detection circuit 15. In addition to the function in the first embodiment, the variable control circuit 23 switches the resonance frequency of the reception antenna 21 when power leakage is detected by the power detection circuit 26.

  FIG. 10 shows a case where the power detection circuits 15 and 26 are separately provided on the transmission / reception side assuming a non-contact type resonance power transmission apparatus, but may be shared.

Next, the switching operation of the resonance frequency by the resonance type power transmission device configured as described above will be described with reference to FIGS.
First, as shown in FIG. 10, it is assumed that there is one resonance type power transmission device (referred to as the first resonance type power transmission device 1a) whose resonance frequency is set to the KHz band. If a resonance type power transmission device (second resonance type power transmission device 1b) whose resonance frequency is also set to the KHz band is brought close thereto, power leakage occurs and mutual interference occurs. Therefore, in the first resonant power transmission device 1a, the power detection circuits 15 and 26 detect the leakage of the power, and the variable control circuits 14 and 23 set the resonance frequency of the first resonant power transmission device 1a to the KHz band. 11 to the MHz band (state shown in FIG. 11). As described above, even when a plurality of resonance type power transmission devices are close to each other, mutual interference can be prevented by automatically changing the resonance frequency for each device.

  Moreover, even when a plurality of resonance type power transmission devices set to the same resonance frequency are close to each other, mutual interference can be avoided by performing one power transmission in an opposite phase. However, if one side is set to non-transmission setting in this state, the relationship between the antiphases is lost, and power leakage occurs from the resonance type power transmission device of transmission setting. Therefore, as shown in FIG. 12, the transmission / reception antennas 13 and 21 are configured to be switched so as to be opened by a switch, and are configured to be non-transmission-type resonant power transmission devices (the first resonant power transmission in FIG. 12). The switch is switched by the variable control circuits 14 and 23 of the device 1a) to open the transmitting and receiving antennas 13 and 21. Thereby, the leakage of electric power can be avoided.

  Although FIG. 12 shows a configuration in which power transmission and reception antennas 13 and 21 are opened to avoid power leakage, the transmission and reception antennas 13 and 21 may be short-circuited, and the same effect can be obtained.

  In the above description, the configuration in which power transmission and reception antennas 13 and 21 are opened or shorted to prevent power leakage is shown. On the other hand, as shown in FIG. 13, the capacitors 12 and 22 can be switched so as to be opened by a switch, and the switch is set by the variable control circuits 14 and 23 of the resonance type power transmission device set to non-transmission. May be switched to open the capacitors 12 and 22, and the same effect can be obtained. Further, the capacitors 12 and 22 may be short-circuited.

  As described above, according to the fourth embodiment, since the leakage power between the adjacent resonant power transmission devices is detected and the resonance frequency is changed, in addition to the effects in the first embodiment, Mutual interference due to the proximity of a plurality of resonant power transmission devices can be avoided. Further, by significantly shifting the resonance frequency of the non-transmission-type resonant power transmission apparatus, mutual interference with the adjacent transmission-type resonant power transmission apparatus can be avoided. Therefore, independent power transmission is possible in a plurality of systems.

Embodiment 5. FIG.
FIG. 14 is a diagram showing a configuration of a resonant power transmission apparatus according to Embodiment 5 of the present invention. 14 is obtained by adding variable inductors (variable impedance elements) L11 and L21 to the resonant power transmission apparatus according to the fifth embodiment shown in FIG. . Other configurations are the same, and the same reference numerals are given and description thereof is omitted.

The variable inductor (transmission-side variable impedance element) L11 is an element that is connected in series to the transmission antenna 13 and has an inductance value that is variable by electronic components. The variable inductor (reception-side variable impedance element) L21 is an element that is connected in series to the reception antenna 21 and has an inductance value that is variable by electronic components. In addition, as a structural example of variable inductor L11, L21, the structure shown to FIGS. 5-7 is mentioned.
In addition to the functions of the fourth embodiment, the variable control circuit 14 controls the inductance value of the variable inductor L11 by controlling the electronic component. In addition to the function of the fourth embodiment, the variable control circuit 23 controls the inductance value of the variable inductor L21 by controlling the electronic component.
The resonance frequency can be finely adjusted by the variable inductors L11 and L21.

  Although FIG. 4 shows the case where the variable inductors L11 and L21 are used as the variable impedance elements, for example, a variable capacitor having a variable capacitance value as shown in FIG. 8 may be used to obtain the same effect. Can do.

  As described above, according to the fifth embodiment, since the variable impedance element is connected in series to the transmission / reception antennas 13 and 21, in addition to the effects of the fourth embodiment, the resonance of the transmission / reception antennas 13 and 21 is achieved. The frequency can be finely adjusted.

Embodiment 6 FIG.
FIG. 15 is a diagram showing a configuration of a resonant power transmission apparatus according to Embodiment 6 of the present invention. In the resonant power transmission apparatus according to the sixth embodiment shown in FIG. 15, variable capacitors (variable impedance elements) C12, C13, C22, and C23 are added to the resonant power transmission apparatus according to the fifth embodiment shown in FIG. It is a thing. Other configurations are the same, and the same reference numerals are given and description thereof is omitted.

The variable capacitors (transmission-side variable impedance elements) C12 and C13 are elements that are connected in parallel to the transmission antenna 13 and have variable capacitance values by electronic components. The variable capacitors (reception-side variable impedance elements) C22 and C23 are elements that are connected in parallel to the reception antenna 21 and have variable capacitance values by electronic components. In addition, as a configuration example of the variable capacitors C12, C13, C22, and C23, the configuration illustrated in FIG.
The variable control circuit 14 controls the capacitance values of the variable capacitors C12 and C13 by controlling the electronic components in addition to the functions of the fifth embodiment. In addition to the functions of the fifth embodiment, the variable control circuit 23 controls the capacitance values of the variable capacitors C22 and C23 by controlling the electronic components.

  The π-type circuit including the variable capacitors C12, C13, C22, and C23 and the variable inductors L11 and L21 can finely adjust the resonance frequency and can perform impedance matching.

Although FIG. 15 shows the case where variable capacitors C12, C13, C22, and C23 are connected in parallel to the transmission / reception antennas 13 and 21, a variable inductor may be connected in parallel to the transmission / reception antennas 13 and 21. An effect can be obtained.
15 shows the case where the variable inductors L11 and L21 are also connected in series to the transmitting and receiving antennas 13 and 21 to form a π-type circuit. However, the variable inductors L11 and L21 are not essential and need not be provided. Good.

  Further, in the fourth embodiment, in the resonance type power transmission device of the non-transmission setting, the configuration for avoiding power leakage by opening or shorting the transmission / reception antennas 13 and 21 or the capacitors 12 and 22 has been described. On the other hand, in the configuration shown in FIG. 15, the variable inductors L11 and L21 and the variable capacitors C12 and C22 can be switched so as to be opened or short-circuited by a switch, and the resonance type power transmission device that is set to non-transmission is variable. The control circuits 14 and 23 may switch the switch to open or short the variable inductors L11 and L21 and the variable capacitors C12 and C22, and the same effect can be obtained. When the above circuit is short-circuited, the amount of resonance frequency shift varies depending on the inductance values of the transmitting and receiving antennas 13 and 21 and the capacitance values of the capacitors 12 and 22 at that time. However, when the amount of deviation is large, it is considered effective because leakage of electric power can be avoided.

  In the present invention, within the scope of the invention, any combination of the embodiments, or any modification of any component in each embodiment, or omission of any component in each embodiment is possible. .

  The resonance type power transmission device according to the present invention can change the resonance frequency in the range of KHz band to MHz band without replacing the antenna dedicated to each frequency band, and performs power transmission by resonance. Suitable for use in devices and the like.

  DESCRIPTION OF SYMBOLS 1a, 1b 1st, 2nd resonance type power transmission device, 11 Transmission power supply circuit, 12 Capacitor (transmission side capacitor), 13 Transmission antenna, 14, 23 Variable control circuit, 15, 25, 26 Power detection circuit, 21 Reception antenna , 22 capacitors (reception side capacitors), 24 reception power supply circuit, 201 motor control circuit, 202 coil, 203, 204 switch, 205 capacitor.

Claims (8)

A resonance-type transmitting antenna whose inductance value is variable by switching the coil length;
A transmitting capacitor connected in series to the transmitting antenna;
The inductance value is variable by switching the coil length, and a resonant receiving antenna that receives power from the transmitting antenna;
A receiving capacitor connected in series to the receiving antenna;
A variable control circuit that switches a resonance frequency by switching coil lengths of the transmitting antenna and the receiving antenna;
A power detection circuit for detecting leakage of power from the own device to another resonant power transmission device or leakage of power from another resonant power transmission device to the own device ;
The transmission antenna and the reception antenna can switch the coil length so that the resonance frequency is switched in the range of KHz band to MHz band,
The variable control circuit switches a resonance frequency of the transmission antenna and a resonance frequency of the reception antenna to the same other frequency when leakage of power is detected by the power detection circuit. Transmission equipment. The transmission-side capacitor and the reception-side capacitor are variable capacitors whose capacitance values are variable,
The resonance type power transmission device according to claim 1, wherein the variable control circuit also controls capacitance values of the transmission-side capacitor and the reception-side capacitor to switch a resonance frequency. A transmission-side variable impedance element connected in series or / and in parallel to the transmission antenna and having variable impedance;
A receiving-side variable impedance element that is connected in series or / and in parallel to the receiving antenna and has variable impedance;
The resonance type power transmission device according to claim 1, wherein the variable control circuit controls impedances of the transmission-side variable impedance element and the reception-side variable impedance element. The transmitting antenna and the receiving antenna can be switched to open or short themselves,
The resonance type power transmission device according to claim 1, wherein the variable control circuit opens or shorts the transmitting antenna and the receiving antenna when the own device is set to non-transmission. The transmission-side capacitor and the reception-side capacitor can be switched to open or short themselves.
The resonance type power transmission device according to claim 2, wherein the variable control circuit opens or shorts the transmission-side capacitor and the reception-side capacitor when the own device is set to non-transmission. The resonant power transmission apparatus according to claim 1, wherein the transmission antenna and the reception antenna perform power transmission by magnetic field resonance. The resonant power transmission apparatus according to claim 1, wherein the transmission antenna and the reception antenna perform power transmission by electric field resonance. The resonant power transmission apparatus according to claim 1, wherein the transmission antenna and the reception antenna perform power transmission by electromagnetic induction.

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