JP2014042428A - Contactless power transmission apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a contactless power transmission apparatus capable of suitably charging a power storage section.SOLUTION: A contactless power transmission apparatus 10 has a ground-side device 11 installed on the ground level and a vehicle-side device 21 mounted on a vehicle. The ground-side device 11 has a high-frequency power source 12 and a power transmitter 13 into which high-frequency power is input from the high-frequency power source 12. The vehicle-side device 21 has a power receiver 23 which can receive high-frequency power from the power transmitter 13 in a contactless manner, and an automotive battery 22. A vehicle-side controller 26, by variably controlling capacitance of a secondary side capacitor 23b constituting the power receiver 23, adjusts an impedance Zin of a load 30 so that direct power of the power value suitable for charge can be input to the automotive battery 22.

Description

  The present invention relates to a contactless power transmission device.

  2. Description of the Related Art Conventionally, as a non-contact power transmission device that does not use a power cord or a power transmission cable, for example, a device using magnetic field resonance is known. For example, the non-contact power transmission device of Patent Literature 1 includes a power transmission device having an AC power source and a primary-side resonance coil to which AC power is input from the AC power source. The non-contact power transmission device includes a power receiving device having a primary side resonance coil and a secondary side resonance coil capable of magnetic field resonance. Then, when the primary side resonance coil and the secondary side resonance coil perform magnetic field resonance, AC power is transmitted from the power transmission device to the power reception device, and the vehicle battery as a power storage unit provided in the power reception device is charged. Is done.

JP 2009-106136 A

  Here, for example, in order to charge the vehicle battery appropriately, it is necessary to supply DC power having a power value suitable for charging to the vehicle battery. Further, depending on the situation, the power value suitable for the charging may vary.

In addition, the situation mentioned above is not restricted to what performs non-contact electric power transmission by magnetic field resonance, The same is applied also to what performs non-contact electric power transmission by electromagnetic induction.
This invention is made | formed in view of the situation mentioned above, and aims at providing the non-contact electric power transmission apparatus which can charge an electrical storage part suitably.

  In order to achieve the above object, an invention according to claim 1 is directed to an AC power source that outputs AC power, and the AC power is input, and includes a primary coil and a primary capacitor. A secondary resonance unit having a side resonance unit, a secondary coil and a secondary capacitor, and capable of receiving the AC power in a non-contact manner from the primary resonance unit; and the secondary resonance unit A rectifying unit that rectifies received AC power, a power storage unit that receives DC power rectified by the rectifying unit, and at least one of inductance of the secondary coil and capacitance of the secondary capacitor are variably controlled. And a control unit configured to input DC power having a power value suitable for charging the power storage unit to the power storage unit.

  According to this invention, at least one of the inductance of the secondary coil and the capacitance of the secondary capacitor is variably controlled, whereby the impedance from the output terminal of the AC power source to the power storage unit is adjusted and input to the power storage unit. The power value of DC power becomes a power value suitable for charging. Thereby, the power storage unit can be charged appropriately.

  In particular, by applying the present invention, it is possible to realize adjustment of the power value of the DC power input to the power storage unit while using an AC power source that cannot change the power value of the AC power output internally. it can. Such an AC power supply tends to have a simple configuration as compared with an AC power supply that can change the power value of the AC power output in the AC power supply. Therefore, the configuration of the AC power supply can be simplified while DC power having a power value suitable for charging is input to the power storage unit.

  Further, in the case of using an AC power source that can change the power value of the AC power output inside, the power storage unit is combined with at least one of the inductance of the secondary coil and the capacitance of the secondary capacitor. It is possible to widen the variable range of the power value of the DC power input to the. Furthermore, if the impedance of the power storage unit fluctuates due to the change in the power value of the AC power output from the AC power supply, charging may occur due to fluctuations in the impedance of the power storage unit. There may occur a case where DC power having an appropriate power value is not input to the power storage unit. On the other hand, according to the present invention, it is suitable for charging even when the impedance of the power storage unit fluctuates by variably controlling at least one of the inductance of the secondary coil and the capacitance of the secondary capacitor. DC power having the same power value can be input to the power storage unit.

  According to a second aspect of the present invention, an electric power value suitable for charging the power storage unit can be varied, and the control means includes at least one of an inductance of the secondary coil and a capacitance of the secondary capacitor. The power value of the DC power input to the power storage unit is made closer to the power value suitable for charging the power storage unit by variably controlling the power storage unit. According to this invention, it is possible to cope with fluctuations in the power value suitable for charging by variably controlling at least one of the inductance of the secondary coil and the capacitance of the secondary capacitor. Thereby, the power storage unit can be charged appropriately.

  According to the present invention, it is possible to suitably charge the power storage unit.

The circuit diagram of the non-contact electric power transmission apparatus of 1st Embodiment. The circuit diagram of the non-contact electric power transmission apparatus of 2nd Embodiment.

(First embodiment)
As shown in FIG. 1, the non-contact power transmission device (non-contact power transmission system) 10 includes a ground side device 11 provided on the ground and a vehicle side device 21 mounted on the vehicle. The ground side device 11 corresponds to a primary side device (power transmission device, power transmission device), and the vehicle side device 21 corresponds to a secondary side device (power reception device, power reception device).

  The ground side device 11 includes a high frequency power source 12 (AC power source) capable of outputting high frequency power (AC power) having a predetermined frequency. The high frequency power supply 12 is configured to be able to output high frequency power using system power. Specifically, the high frequency power supply 12 includes an AC / DC converter 12a that converts system power into DC power, and a DC / RF converter 12b that converts the DC power into high frequency power. Each of these converters 12a and 12b has a switching element, and operates by switching (ON / OFF) of the switching element. That is, the high frequency power supply 12 is a switching power supply that obtains high frequency power of the predetermined frequency by switching of the switching element.

  The high-frequency power output from the high-frequency power source 12 is transmitted to the vehicle-side device 21 in a non-contact manner, and used for charging the vehicle battery 22 (power storage unit) provided in the vehicle-side device 21. Specifically, the non-contact power transmission device 10 includes a power transmitter 13 (primary-side resonance unit) provided in the ground-side device 11 to perform power transmission between the ground-side device 11 and the vehicle-side device 21. And a power receiver 23 (secondary resonance unit) provided in the vehicle-side device 21. High frequency power is input to the power transmitter 13.

  The power transmitter 13 and the power receiver 23 are configured to be capable of magnetic field resonance. Specifically, the power transmitter 13 includes a resonance circuit including a primary coil 13a and a primary capacitor 13b connected in parallel. The power receiver 23 is composed of a resonance circuit including a secondary coil 23a and a secondary capacitor 23b connected in parallel. Both resonance frequencies are the same.

  According to this configuration, when high-frequency power is input from the high-frequency power source 12 to the power transmitter 13 (primary coil 13a), the power transmitter 13 and the power receiver 23 (secondary coil 23a) magnetically resonate. As a result, the power receiver 23 receives a part of the energy of the power transmitter 13. That is, the power receiver 23 receives high frequency power from the power transmitter 13.

  The vehicle-side device 21 includes a rectifier 24 as a rectifier that rectifies high-frequency power received by the power receiver 23 into DC power. The vehicle battery 22 is composed of, for example, a plurality of battery cells connected in series, and is charged when DC power is input from the rectifier 24.

  Here, the charging mode of the vehicle battery 22 includes normal charging and push-in charging. Normal charging is a charging mode that is performed from the start of charging until the charging amount reaches a predetermined threshold amount. Push-in charging is a charging mode that is performed based on the amount of charge being equal to or greater than the threshold amount and that compensates (reduces) the capacity variation of each battery cell.

  Between the rectifier 24 and the vehicle battery 22, a detection sensor 25 that detects the amount of charge of the vehicle battery 22 is provided. The detection result of the detection sensor 25 is input to a vehicle-side controller 26 as a control unit provided in the vehicle-side device 21. Thereby, the vehicle-side controller 26 can grasp the charge amount of the vehicle battery 22.

  Further, the ground side device 11 is provided with a power source side controller 14 capable of wireless communication with the vehicle side controller 26. The power supply side controller 14 determines whether to output high frequency power from the high frequency power supply 12 through exchanging information with the vehicle side controller 26.

  Next, the power value of direct-current power (high-frequency power output from the high-frequency power source 12) input to the vehicle battery 22 and a configuration for adjusting the power value will be described in detail. For convenience of explanation, in the following explanation, it is assumed that the relative position of the power transmitter 13 and the power receiver 23 is a predetermined reference position.

  The high frequency power source 12 is a power source that cannot change the voltage value and current value of the high frequency power output in the high frequency power source 12. In other words, there is only one power value that can be set in the high-frequency power source 12.

  Incidentally, if one load 30 is from the output end of the high frequency power supply 12 to the vehicle battery 22, the high frequency power output from the high frequency power supply 12 is input to the load 30. The reference value (initial value) of the impedance Zin of the load 30 is set so that high-frequency power having a power value suitable for normal charging of the vehicle battery 22 (hereinafter referred to as set value power) is output from the high-frequency power source 12. ing.

The set value power is high-frequency power having a power value necessary for inputting DC power having a power value suitable for normal charging (hereinafter referred to as normal charging power) to the vehicle battery 22.
More specifically, the power value of the high-frequency power output from the high-frequency power supply 12 varies according to the impedance Zin of the load 30. If the power value of the high-frequency power output from the high-frequency power source 12 varies, the power value of the DC power input to the vehicle battery 22 also varies. For example, when the impedance Zin of the load 30 is greater than the reference value, DC power having a power value smaller than the power value of the normal charging power is input to the vehicle battery 22. On the other hand, when the impedance Zin of the load 30 is smaller than the reference value, DC power having a power value larger than the power value of the normal charging power is input to the vehicle battery 22. That is, by changing the impedance Zin of the load 30, it is possible to input DC power having a desired power value to the vehicle battery 22.

  Here, the impedance Zin of the load 30 depends on the capacitance of the secondary capacitor 23b. Specifically, when the capacitance of the secondary side capacitor 23b decreases, the impedance Zin of the load 30 decreases, and when the capacitance of the secondary side capacitor 23b increases, the impedance Zin of the load 30 increases.

  In such a configuration, the secondary capacitor 23b in the power receiver 23 is configured to have a variable capacitance. The ground-side device 11 is provided with a measuring device 40 as a measuring means for measuring the power value of the high-frequency power output from the high-frequency power source 12. The measuring device 40 is provided at the output end of the high frequency power supply 12 (between the high frequency power supply 12 and the power transmitter 13), measures the output voltage and output current of the high frequency power supply 12, and outputs the measurement results to the power supply controller 14. Send to.

  The vehicle-side controller 26 variably controls (changes) the capacitance of the secondary-side capacitor 23 b based on the measurement result of the measuring instrument 40, and in other words, the power value of the DC power input to the vehicle battery 22. The power value of the high frequency power output from the high frequency power supply 12 is adjusted. Specifically, when the vehicle-side controller 26 variably controls the capacitance of the secondary-side capacitor 23b, the vehicle-side controller 26 grasps the measurement result of the measuring instrument 40 by exchanging information with the power supply-side controller 14. The vehicle-side controller 26 adjusts the impedance Zin of the load 30 by variably controlling the capacitance of the secondary-side capacitor 23b based on the measurement result of the measuring instrument 40, and has a power value different from the set value power. High frequency power, for example, adjustment power is output. The adjusted power is a high-frequency power having a power value necessary for causing the vehicle battery 22 to input “push-in charging power” that is DC power having a power value suitable for indentation charging.

  In addition, the reference value (initial value) of the capacitance of the secondary side capacitor 23b is set so that the resonance frequency of the power receiver 23 is the same as the resonance frequency of the power transmitter 13. The reference value of the impedance Zin of the load 30 is a value set under the condition that the capacitance of the secondary capacitor 23b is at the reference value.

Next, a configuration related to the control of the controllers 14 and 26 will be described.
As shown in FIG. 1, each controller 14, 26 grasps the current charge amount of the vehicle battery 22 when the vehicle is arranged such that the relative position of the power transmitter 13 and the power receiver 23 is the reference position. Then, charge control according to the charge amount is performed.

  Specifically, the vehicle-side controller 26 determines whether or not the current charge amount is larger than a predetermined threshold amount. Then, when the current charge amount is smaller than the threshold amount, the vehicle-side controller 26 is variable so that the capacitance of the secondary side capacitor 23b becomes the reference value so that the set value power is output from the high-frequency power source 12. Control. On the other hand, the vehicle-side controller 26 variably controls the capacitance of the secondary-side capacitor 23b so that the adjustment power is output from the high-frequency power source 12 when the current charge amount is equal to or greater than the threshold amount.

  Further, the vehicle-side controller 26 periodically grasps the charge amount of the vehicle battery 22 during charging. When the charge amount of the vehicle battery 22 is equal to or greater than the threshold amount in a situation where the set value power is output from the high frequency power source 12, the vehicle side controller 26 variably controls the capacitance of the secondary side capacitor 23b. Thus, the high frequency power output from the high frequency power supply 12 is switched from the set value power to the adjusted power. Thereby, DC power (push-in charge power) corresponding to the adjusted power is input to the vehicle battery 22 (push-in charge).

  When the charging of the vehicle battery 22 is completed (finished), the vehicle controller 26 transmits a stop request signal to the power supply controller 14. When receiving the stop request signal, the power supply side controller 14 controls the high frequency power supply 12 to stop the output of the high frequency power. Thereby, charging of the battery 22 for vehicles is complete | finished.

Next, the operation of this embodiment will be described.
As described above, the capacitance of the secondary side capacitor 23b is variably controlled, so that the impedance Zin of the load 30 is adjusted, and the power value of the DC power input to the vehicle battery 22 (output from the high frequency power source 12). The power value of the high frequency power) is adjusted. Thereby, the power value of the DC power input to the vehicle battery 22 can be adjusted without changing the voltage value or current value of the high-frequency power output from the high-frequency power source 12 in the high-frequency power source 12.

  If attention is paid to the power value suitable for charging the vehicle battery 22, the power value suitable for charging the vehicle battery 22 varies depending on the charging mode (normal charging, push-in charging). On the other hand, the vehicle-side controller 26 variably controls the capacitance of the secondary-side capacitor 23b, so that the power value of the DC power input to the vehicle battery 22 is suitable for charging the vehicle battery 22. It can be said that it is close to the power value.

According to the embodiment described in detail above, the following excellent effects are obtained.
(1) Adjusting the impedance Zin of the load 30 by changing the capacitance of the secondary capacitor 23b and changing the capacitance of the secondary capacitor 23b, thereby charging the vehicle battery 22 (normally DC power having a power value suitable for both charging and push-in charging) is input. Thereby, even when the voltage value and current value of the high-frequency power output in the high-frequency power source 12 cannot be changed, normal charging power and push-in charging power can be input to the vehicle battery 22. Therefore, a component (for example, a DC / DC converter) that varies the power value of the high-frequency power output from the high-frequency power source 12 can be omitted. Therefore, it is possible to simplify the configuration of the high frequency power supply 12 while inputting DC power having a power value suitable for charging to the vehicle battery 22.

  (2) In particular, the capacitance of the secondary-side capacitor 23b is employed as a means for adjusting the impedance Zin of the load 30. Thereby, the electric power value of the direct-current power input into the vehicle battery 22 can be adjusted using the existing configuration.

  If attention is paid to the set value power and the adjusted power, the vehicle-side controller 26 adjusts the power value of the high-frequency power output from the high-frequency power source 12 by variably controlling the capacitance of the secondary-side capacitor 23b. It can be said that there is.

  Further, if attention is paid to the fact that the power value of the high frequency power received by the secondary coil 23a varies according to the capacitance of the secondary capacitor 23b, the vehicle controller 26 determines that the capacitance of the secondary capacitor 23b. It can be said that the power value of the high-frequency power received by the secondary coil 23a is adjusted by variably controlling the power.

(Second Embodiment)
In the present embodiment, the configuration of the high frequency power supply is different from that of the first embodiment. The different points will be described with reference to FIG. In addition, about the same structure, while attaching | subjecting the same code | symbol, the description is abbreviate | omitted.

  As shown in FIG. 2, the high frequency power supply 52 of the present embodiment is configured to output a plurality of types of high frequency power having different power values by variably controlling (changing) the voltage value in the high frequency power supply 52. Yes. In other words, there are a plurality of types of power values that can be set in the high-frequency power source 52. Specifically, the high frequency power supply 52 includes an AC / DC converter 52a and a DC / RF converter 52b, and also includes a DC / DC converter 52c (changing means) provided between the two. The DC / DC converter 52c has a switching element 52cc. Based on switching (on / off) of the switching element 52cc, the DC power converted by the AC / DC converter 52a has a different voltage value, More specifically, the voltage is converted to a voltage value corresponding to the duty ratio of on / off of the switching element 52cc and output to the DC / RF converter 52b. The high frequency power supply 52 outputs high frequency power having a power value corresponding to the voltage value of the direct current power output from the DC / DC converter 52c. Since the voltage value of the DC power output from the DC / DC converter 52c is defined by the duty ratio, the power value of the high frequency power output from the high frequency power supply 52 is defined by the duty ratio.

  In such a configuration, the power supply side controller 14 changes the power value of the high frequency power output from the high frequency power supply 52 according to the situation. For example, the vehicle-side controller 26 transmits a first request signal to the power supply-side controller 14 when the current charge amount is smaller than the threshold amount in a charging state, while the current charge amount is equal to or greater than the threshold amount. In this case, the second request signal is transmitted to the power supply side controller 14.

  When the power supply side controller 14 receives the first request signal, the DC / DC converter 52c (on / off duty of the switching element 52cc) is set so that the set value power similar to that of the first embodiment is output from the high frequency power supply 52. Ratio). Thereby, normal charging can be performed.

  In addition, when receiving the second request signal, the power supply side controller 14 controls the DC / DC converter 52c so that the adjustment power similar to that of the first embodiment is output from the high frequency power supply 52. Thereby, it is possible to perform push-in charging. That is, the DC / DC converter 52c controls the voltage value in the high-frequency power source 52 so that the power value of the DC power input to the vehicle battery 22 approaches the power value suitable for charging the vehicle battery 22. The power value of the high frequency power output from the high frequency power supply 52 is changed.

  Here, the vehicle battery 22 is a variable load whose impedance fluctuates according to the power value of the input DC power. For this reason, when the power value of the high-frequency power output from the high-frequency power source 52 changes and the power value of the DC power input to the vehicle battery 22 varies, the impedance of the vehicle battery 22 varies, and the high-frequency power source The impedance Zin of the load 30 from the output terminal 52 to the vehicle battery 22 varies. Then, although the adjustment power is adjusted so as to be output in the high frequency power supply 52, the power value of the DC power input to the vehicle battery 22 deviates from the power value of the push-in charging power. Cases can arise.

  On the other hand, in the present embodiment, the capacitance of the secondary side capacitor 23b can be changed in accordance with the fluctuation of the impedance Zin of the load 30 caused by the fluctuation of the power value of the DC power input to the vehicle battery 22. Control is to be performed. Specifically, the vehicle-side controller 26 acquires the measurement result of the measuring instrument 40 by exchanging information with the power-source-side controller 14, and the high-frequency power output from the high-frequency power source 52 based on the measurement result. Know the value. When the power value of the high-frequency power output from the high-frequency power source 52 is different from the power value of the adjusted power, the vehicle-side controller 26 determines that the power value of the high-frequency power output from the high-frequency power source 52 is the adjusted power. The capacitance of the secondary side capacitor 23b is variably controlled so as to approach the power value. In other words, the vehicle-side controller 26 variably controls the capacitance of the secondary-side capacitor 23b, so that the power value of the direct-current power input to the vehicle battery 22 is changed to the power suitable for charging the vehicle battery 22. Approach the value (the power value of the indentation charging power).

Next, the operation of this embodiment will be described.
The high frequency power supply 52 can output a plurality of types of high frequency power having different power values by variably controlling the voltage value in the high frequency power supply 52. In such a configuration, when the high-frequency power output from the high-frequency power source 52 is changed from the set value power to the adjusted power in the high-frequency power source 52, the secondary side capacitor 23 b corresponds to the fluctuation of the impedance Zin of the load 30. Variable control of the capacitance is performed. Specifically, the capacitance of the secondary side capacitor 23b is adjusted such that the power value of the high frequency power input from the high frequency power supply 52 to the load 30 matches the power value of the adjustment power. Thereby, even if the impedance of the vehicle battery 22 fluctuates, DC power having a power value suitable for each charging mode can be input to the vehicle battery 22.

According to the embodiment described in detail above, the following excellent effects are obtained.
(3) The capacitance of the secondary side capacitor 23b is variably controlled in accordance with the fluctuation of the impedance Zin of the load 30 accompanying the change from the set value power to the adjusted power by the DC / DC converter 52c. Specifically, the capacitance of the secondary-side capacitor 23b is variably controlled so that the power value of the high-frequency power output from the high-frequency power supply 52 approaches the power value of the adjustment power. Thereby, even if the impedance Zin of the load 30 fluctuates, direct-current power (push-up charge power) having a power value suitable for push-in charge can be input to the vehicle battery 22. Therefore, when determining the power value of the high-frequency power output from the high-frequency power source 52, it is not necessary to consider the fluctuation of the impedance Zin, and the setting may be simply made in relation to the desired power value. Thereby, the design of the set value of the high frequency power supply 52 can be facilitated. In other words, the vehicle-side controller 26 varies the power value of the input power of the vehicle battery 22 due to the variation of the impedance of the vehicle battery 22 due to the change from the set value power to the adjusted power by the DC / DC converter 52c. It can be said that the capacitance of the secondary-side capacitor 23b is variably controlled so as to be reduced.

  (4) Further, the impedance Zin of the load 30 can be adjusted by variable control of the capacitance of the secondary side capacitor 23b, and as a result, the power value of the high frequency power output from the high frequency power supply 52 can be adjusted. That is, there are both a voltage value in the high frequency power supply 52 (on / off duty ratio of the switching element 52cc) and a capacitance of the secondary capacitor 23b as parameters for changing the power value of the high frequency power output from the high frequency power supply 52. Therefore, by combining the both, the fluctuation range (variable width) of the power value of the high-frequency power can be widened. Thereby, even if it is a case where the electric power value (the maximum value) used for electric power transmission changes due to the change of a specification etc., it can respond suitably.

In addition, you may change each said embodiment as follows.
In each embodiment, the capacitance of the secondary side capacitor 23b is adopted as the one that adjusts the impedance Zin of the load 30. However, the present invention is not limited to this. For example, the inductance of the secondary side coil 23a is variable, and the inductance is variable. It is good also as a structure which adjusts the impedance Zin of the load 30 by controlling.

  In each embodiment, the relative position of the power transmitter 13 and the power receiver 23 is the reference position. However, the present invention is not limited to this. For example, the relative position of both may be shifted from the reference position. In this case, the capacitance of the secondary capacitor 23b may be variably controlled based on the measurement result of the measuring device 40 so that DC power having a power value suitable for charging is input to the vehicle battery 22.

  ○ In addition to (or instead of) the adjusted power, high-frequency power with other power values may be output. For example, in the case of performing quick charging in which the charging time is shorter than that of normal charging, the secondary side capacitor 23b is configured so that DC power having a power value larger than that of normal charging power is input to the vehicle battery 22. The capacitance may be variably controlled.

  In each embodiment, the measuring device 40 is provided at the output end of the high-frequency power sources 12 and 52. However, the present invention is not limited to this, and the setting location is arbitrary. For example, it is good also as a structure which provides the measuring device 40 in the vehicle side apparatus 21, and estimates the electric power value of the high frequency electric power output from the high frequency power supplies 12 and 52 based on the measurement result. Further, the vehicle-side device 21 may be provided with a measuring device that measures the power value of the DC power input to the vehicle battery 22 and outputs the measurement result to the vehicle-side controller 26. In this case, since it is not necessary to exchange information related to the measurement result between the power supply side controller 14 and the vehicle side controller 26, the processing can be simplified.

  In each embodiment, the vehicle-side controller 26 is configured to perform variable control of the capacitance of the secondary-side capacitor 23b. However, the control subject is arbitrary, and for example, a dedicated control circuit is provided separately from the vehicle-side controller 26. It may be provided. Further, for example, a drive circuit that varies the capacitance of the secondary capacitor 23b may be provided, and the power supply controller 14 may control the drive circuit.

  In each embodiment, the measuring device 40 is provided. However, the measuring device 40 is not limited to this, and the measuring device 40 may be omitted. In this case, for example, under the condition that the relative position of the power transmitter 13 and the power receiver 23 is the reference position, the power value of the DC power input to the vehicle battery 22 is a power value suitable for charging (for example, pushing in). It is possible to grasp (calculate) the capacitance of the secondary capacitor 23b, which is the power value of the charging power. Therefore, the power value suitable for charging the vehicle battery 22 and the capacitance of the secondary capacitor 23b for inputting the power value suitable for the charging to the vehicle battery 22 are set in association with each other. Store the map in memory. And the vehicle side controller 26 specifies the capacitance of the secondary side capacitor | condenser 23b with reference to the said map, and performs the variable control of the said capacitance based on the specific result.

The voltage waveform of the high frequency power output from the high frequency power supplies 12 and 52 is arbitrary such as a pulse waveform or a sine wave.
In each embodiment, the capacitors 13b and 23b are provided, but these may be omitted. In this case, magnetic resonance is performed using the parasitic capacitances of the coils 13a and 23a, and the inductance of the secondary coil 23a is made variable.

In each embodiment, the resonance frequency of the power transmitter 13 and the resonance frequency of the power receiver 23 are set to be the same. However, the present invention is not limited to this, and may be different within a range in which power transmission is possible.
In each embodiment, magnetic field resonance is used to realize non-contact power transmission. However, the present invention is not limited to this, and electromagnetic induction may be used.

  The power transmitter 13 may be separately provided with a primary coupling coil that is coupled with a resonance circuit including the primary coil 13a and the primary capacitor 13b by electromagnetic induction. In this case, the resonant circuit is configured to receive high frequency power from the primary side coupling coil by electromagnetic induction. Similarly, the power receiver 23 is provided with a secondary side coupling coil that is coupled by electromagnetic induction to a resonance circuit including the secondary side coil 23a and the secondary side capacitor 23b, and the resonance of the power receiver 23 is performed using the secondary side coupling coil. High frequency power may be extracted from the circuit.

  The high frequency power supplies 12 and 52 may be a voltage source having a constant voltage value, or may be a current source having a constant current value. The high frequency power supply 52 is configured to output a plurality of types of high frequency power having different power values by variably controlling the voltage value in the high frequency power supply 52. A plurality of types of high-frequency power having different power values may be output by variably controlling. “Variable control (change) of voltage value or current value in high frequency power supply 52” can be said to variably control the voltage value or current value of AC power (system power) input to high frequency power supply 52. . That is, it can be said that the high frequency power supply 52 is configured to be capable of outputting a plurality of types of high frequency power having different power values by variably controlling the voltage value or current value of the input AC power.

  In each embodiment, the non-contact power transmission device 10 is applied to a vehicle, but is not limited thereto, and may be applied to other devices. For example, it may be applied to charge a battery of a mobile phone.

  In addition, the high frequency power received by the power receiver 23 may be used for purposes other than charging the vehicle battery 22. For example, it may be used to drive another device having a predetermined fixed impedance.

  (Circle) you may provide the secondary side regulator which adjusts an impedance between the vehicle side apparatus 21, and the electric power receiver 23 and the rectifier 24 in detail. Moreover, you may provide the primary side regulator which adjusts an impedance between the ground side apparatus 11 and the high frequency power supplies 12 and 52 and the power transmission device 13 in detail.

Next, technical ideas that can be grasped from the above embodiments and other examples will be described below.
(A) The non-contact power transmission apparatus according to claim 1 or 2, wherein the power value that can be set in the AC power supply is one type.

(B) The AC power source includes a changing unit that changes a power value of AC power output from the AC power source by changing a voltage value or a current value in the AC power source. The power value of DC power input to the power storage unit approaches a power value suitable for charging the power storage unit,
The power storage unit varies in impedance according to the power value of the input DC power,
The control means variably controls at least one of the inductance of the secondary coil and the capacitance of the secondary capacitor in response to a change in impedance of the power storage unit when a change is made by the changing means. The contactless power transmission device according to claim 2, wherein the power value of the DC power input to the power storage unit is brought close to a power value suitable for charging the power storage unit.

(C) The direct current power having a power value suitable for charging the power storage unit includes a first direct current power and a second direct current power having different power values,
The control means selectively controls the first DC power or the second DC power to the power storage unit by variably controlling at least one of an inductance of the secondary coil and a capacitance of the secondary capacitor. The non-contact power transmission device according to claim 1, wherein the non-contact power transmission device is input.

  (D) The control means variably controls the capacitance of the secondary capacitor so that DC power having a power value suitable for charging the power storage unit is input to the power storage unit. The contactless power transmission device according to any one of claims 1 and 2, and technical ideas (a) to (c).

(E) In a power receiving device having a primary side coil and a primary side capacitor and capable of receiving the AC power in a non-contact manner from a power transmitting device including a primary side resonance unit to which AC power is input,
A secondary side resonating unit having a secondary side coil and a secondary side capacitor and capable of receiving the AC power in a non-contact manner from the primary side resonating unit;
A rectifying unit that rectifies AC power received by the secondary coil;
A power storage unit to which DC power rectified by the rectifying unit is input;
With
At least one of the inductance of the secondary coil and the capacitance of the secondary capacitor is configured to be changeable, and at least one of the inductance of the secondary coil and the capacitance of the secondary capacitor is changed. Thus, the DC power input to the power storage unit is changed to a power value suitable for charging.

  In addition, in the relationship with the said technical idea (e), it is good also as a structure by which the high frequency power supplies 12 and 52 are abbreviate | omitted and the system power of a system power supply is input into the power transmission device 13. FIG.

  DESCRIPTION OF SYMBOLS 10 ... Non-contact electric power transmission apparatus, 11 ... Ground side apparatus (power transmission apparatus), 12 ... High frequency power supply, 13a ... Primary side coil, 21 ... Vehicle side apparatus (power receiving apparatus), 22 ... Vehicle battery (electric storage part), 23a ... secondary coil, 23b ... secondary capacitor, 30 ... load, 40 ... measuring instrument, 52 ... high frequency power supply of the second embodiment, 52c ... DC / DC converter.

Claims (2)

An AC power supply that outputs AC power;
The AC power is input, and a primary side resonance unit having a primary side coil and a primary side capacitor,
A secondary side resonating unit having a secondary side coil and a secondary side capacitor and capable of receiving the AC power in a non-contact manner from the primary side resonating unit;
A rectifying unit that rectifies AC power received by the secondary-side resonance unit;
A power storage unit to which DC power rectified by the rectifying unit is input;
By variably controlling at least one of the inductance of the secondary coil and the capacitance of the secondary capacitor, DC power having a power value suitable for charging the power storage unit is input to the power storage unit. Control means to
A non-contact power transmission device comprising: The power value suitable for charging the power storage unit can vary,
The control means variably controls at least one of an inductance of the secondary side coil and a capacitance of the secondary side capacitor to thereby change the power value of the DC power input to the power storage unit of the power storage unit. The non-contact power transmission device according to claim 1, wherein the power value approaches a power value suitable for charging.