JP2014075927A - Non-contact power supply system, power reception apparatus, power supply stand, and non-contact power supply method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable non-standard charging without adding hardware for new communication.SOLUTION: A reception apparatus 50 comprises: reception side control means 53 for enabling switching between a first current mode where an electric load LD can be supplied with rating current having a first current value and a second current mode where the electric load LD can be supplied with rating current having a second current value larger than the first current value; and request signal transmission means 57 for enabling transmission of a first transmission request signal for requesting first transmission power required for power supply in the first current mode and a second transmission request signal as transmission request signals. A power supply stand 10 comprises power control means 13 for enabling switching the first transmission power in the case of receiving the first transmission request signal at request signal reception means 14 and second transmission power. When the request signal reception means 14 receives the second transmission request signal and the first transmission request signal from the request signal transmission means 57, the power supply stand 10 makes the power control means 13 transmit the second transmission power according to the second transmission request signal and ignores the first transmission request signal.

Description

  The present invention relates to a non-contact power feeding system, a power receiving device, a power feeding base, and a non-contact power feeding method in which a power transmitting coil and a power receiving coil are arranged close to each other so as to be electromagnetically coupled and power is fed from the power transmitting coil to the power receiving coil by electromagnetic induction. About.

  A contactless power feeding method has been developed in which a power receiving device with a built-in power receiving coil is set on a power feeding base with a built-in power transmitting coil, and power is transferred from the power transmitting coil to the power receiving coil (see Patent Document 1). In this non-contact power supply method, for example, as shown in FIG. 12, a power receiving device 260 such as a mobile phone is placed on a charging surface 221 of a non-contact power supply base 220, and power is transferred from the power supply base 220 to the power receiving device 260. Then, the secondary battery built in the power receiving device 260 is charged. In order to realize such non-contact power feeding, the power receiving coil 261 of the mobile phone is brought close to the power transmitting coil 251 of the power feeding base 220, and power is supplied from the power transmitting coil 251 to the power receiving coil 261. As a result, the internal battery is charged with the electric power induced in the power receiving coil 261. This power supply method does not require the mobile phone to be connected to the power supply base via a connector, and has the advantage that power can be transferred to the mobile phone in a contactless manner. Further, the power receiving device is not limited to a mobile phone, and an emergency charger with a built-in power receiving coil can be used.

  By the way, power receiving devices in recent years are required to have higher output due to demands such as a larger screen and longer battery driving time, and the capacity of built-in secondary batteries tends to be increased. As a result, the power required for charging also increases, and the charging time tends to be longer if the transmission power is the same as in the past. On the other hand, there is a strong demand for shortening the charging time as much as possible, and there is a demand for higher output of the power supply stand.

  On the other hand, standardization of the contactless power feeding method is being promoted so that different models and manufacturers of power receiving devices can be charged with a common charging stand. For example, in a WPC (Wireless Power Consortium) which is one of standardization organizations, the power supplied by the charging base 1310 to the power receiving device 1350 is defined as 5 W as shown in FIG. For this reason, if it is going to correspond to this standard, it cannot charge with electric power more than a standard value (5W in WPC).

  In order to charge a high-output power receiving device in a short time, it is conceivable to increase the power supply stand as described above. Accordingly, it is conceivable that charging with high output is possible in a combination of a power receiving device and a power supply base that is compatible with charging with high output outside the standard while enabling charging according to the standard. For example, in WPC, only communication (AM modulation) from the power receiving device to the power supply base is defined. On the other hand, as shown in FIG. 14, the power supply base and the power receiving device correspond to each other by performing communication (for example, FM modulation) to the power receiving device from the power supply stand side by a nonstandard standard method. This makes it possible to grasp that the battery is charging and to charge at a high output.

  However, in this method, communication from the power supply base to the power receiving device, which is not required by the standard, is indispensable. Therefore, it is necessary to provide a transmitter on the power supply base side and a receiver on the power receiving device side. There is a problem that the configuration becomes complicated by the addition and the cost becomes high.

  Furthermore, if you prepare an electrical device that can supply power at such a high power outside the standard, if it is placed on a power supply stand that does not support high power power outside the standard, the electrical device will exceed the standard value. As a result of requiring power supply at high output, the current value of the power supply base rises and generates heat, or a foreign object is interposed between the power supply base and the power receiving device due to the current value or temperature increase. As a result, there is a problem that power supply is stopped.

JP 2008-17562 A

  The present invention has been made in view of such conventional problems. A main object of the present invention is to provide a non-contact power supply system, a power receiving device, a power supply stand, and a non-contact power supply method that enable non-standard charging without adding hardware for new communication. is there.

Means for Solving the Problems and Effects of the Invention

  In order to solve the above-described problem, according to the first contactless power feeding system of the present invention, the power receiving device includes an electric load, and a power feeding base that feeds power to the power receiving device. A contactless power supply system capable of supplying power by transmitting power from a power supply without contact, wherein the power receiving device includes the electric load, a power receiving coil for receiving power from the power feeding base, and the power receiving coil. With the received power received, the power receiving side control means for controlling the driving of the electric load, the power value acquisition means for detecting the power receiving side detection power actually obtained on the power receiving device side, and the power value acquisition means Request signal transmission means for transmitting to the power supply base side a power transmission request signal for instructing a transmission power amount transmitted from the power supply base to the power receiving device based on the detected power reception side detection power. The powerhouse A power transmission coil for electromagnetically coupling with the power receiving coil to transmit power, a request signal receiving means for receiving a power transmission request signal transmitted from the request signal transmitting means, and a power transmission request signal received by the request signal receiving means And a power control means for controlling the amount of transmitted power transmitted from the power transmission coil, and the power receiving side control means can feed the electrical load with a first current value as a rated current. It is possible to switch between a first current mode and a second current mode in which power can be supplied using a second current value larger than the first current value as a rated current, and the request signal transmission means uses a first current as a power transmission request signal. The first transmission request signal for requesting the first transmission power required for power supply in the mode and the second transmission request signal for requesting the second transmission power required for power supply in the second current mode can be transmitted. The power supply base uses the power control means to convert the first transmitted power when the first transmission request signal is received by the request signal receiving means and the second transmitted power when the second transmission request signal is received. When the request signal receiving means receives the second power transmission request signal and the first power transmission request signal from the request signal transmitting means, the power control means supplies the second transmitted power according to the second power transmission request signal. The first power transmission request signal can be ignored while power is transmitted. With the above configuration, the power supply in the second current mode with higher output is enabled, and even if the power supply base or the power receiving device does not support such power supply in the second current mode, the first current mode This makes it possible to use the power supply safely and safely. In addition, this method can be easily applied to existing non-contact charging, so that an advantage that it can be mounted at low cost without adding a new member can be obtained.

  According to the second contactless power supply system, the electrical load is a secondary battery, the power supply base is a charging base for charging the secondary battery, and the power supply base is connected to the power receiving device. Thus, the secondary battery can be charged by transmitting power without contact.

  Furthermore, according to the third contactless power supply system, the first current value is a current value according to a standardized contactless charging method, and the second current value is changed to a non-standardized contactless charging method. According to the current value. With the above-described configuration, it is possible to supply power at a higher output than the standardized current value while enabling power supply with a power supply base and a power receiving device that are compatible with the standardized contactless charging method.

  Furthermore, according to the fourth contactless power feeding system, the first current value can be 700 mA and the second current value can be 1 A. As a result, it is possible to supply power even at higher output than the original standard while supporting non-contact power supply according to the Qi standard.

  Furthermore, according to the fifth contactless power feeding system, the request signal transmitting means can transmit the first power transmission request signal and the second power transmission request signal in a time-sharing manner. With the above configuration, the first transmission request signal and the second transmission request signal can be transmitted by one request signal transmission unit, and the configuration can be simplified by sharing the transmission mechanism.

  Furthermore, according to the sixth contactless power feeding system, it is possible to further include a moving mechanism for moving the power transmission coil within a mounting surface on which the power receiving device is mounted. With the above configuration, the power receiving device can be placed at an arbitrary position within the placement surface, and the power transmission coil can be moved to be electromagnetically coupled to the power reception coil.

  Furthermore, according to the seventh contactless power feeding system, the power transmission coil can be fixed. With the above configuration, low-cost non-contact power feeding can be realized by omitting the moving mechanism of the power transmission coil.

  Furthermore, according to the eighth contactless power feeding system, the power receiving side control means can be switched to the first power mode capable of feeding the first power value as the rated power and the second current mode instead of the first current mode. It is possible to switch between the second power mode in which the second power value larger than the first power value can be supplied as the rated power, and the request signal transmission means can transmit the request power transmission signal in the first power mode as a power transmission request signal. It is possible to transmit a first transmission request signal for requesting first transmission power required for power supply and a second transmission request signal for requesting second transmission power required for power supply in the second power mode. With the above-described configuration, it is possible to accurately determine whether or not to supply power, not only using the current value but also using the power value.

  Furthermore, according to the ninth power receiving device, the power receiving device can be driven in a contactless manner with the power transmitted from the power transmission coil built in the power supply stand, and the power is supplied to the electrical load and the electrical load. Power receiving coil that can be electromagnetically coupled to the power transmitting coil, power receiving side control means for controlling the driving of the electric load with the received power received by the power receiving coil, and actually obtained on the power receiving device side A power value acquisition means for detecting a power reception side detection power, and a power transmission request signal for instructing a transmission power amount transmitted from the power supply to the power receiving device based on the power reception side detection power detected by the power value acquisition means. A request signal transmission means for transmitting to the power supply side, the power reception side control means, for the electric load, a first current mode capable of supplying a first current value as a rated current; and The second current mode that can be fed with a second current value larger than the one current value as a rated current can be switched, and the request signal transmitting means is a power transmission request signal that is necessary for feeding in the second current mode. It is possible to transmit a second transmission request signal for requesting two transmission powers and a first transmission request signal for requesting the first transmission power necessary for power supply in the first current mode. With the above configuration, power supply in the second current mode with higher output is possible, but even if the power supply stand side does not support power supply in the second current mode, power supply in the first current mode is possible. Can be used safely.

  Further, according to the tenth power receiving device, the power receiving side control means changes to the first power mode in which the first power value can be supplied as the rated power and the second current mode instead of the first current mode. The second power mode can be switched to a second power mode in which a second power value larger than the first power value can be fed as a rated power, and the request signal transmitting means feeds power in the second power mode as a power transmission request signal. The second transmission request signal for requesting the second transmission power required for the transmission and the first transmission request signal for requesting the first transmission power required for the power supply in the first power mode can be transmitted subsequently. With the above-described configuration, it is possible to accurately determine whether or not to supply power, not only using the current value but also using the power value.

  Furthermore, according to the eleventh power supply stand, it is a power supply stand that can transmit power to a power receiving device having an electrical load without contact, and is electromagnetically coupled to a power receiving coil incorporated in the power receiving device. A power transmission coil for supplying power to the power receiving device; and a request signal receiving means for receiving a power transmission request signal transmitted from the power receiving device and instructing the amount of power transmitted from the power supply base to the power receiving device; Power control means for controlling the amount of power transmitted from the power transmission coil based on the power transmission request signal received by the request signal receiving means, wherein the power control means is the request signal receiving means, When a first transmission request signal for requesting a first transmission power required for power supply in the first current mode for supplying power to an electrical load is received with one current value as a rated current, the first transmission power is obtained from the power transmission coil. Sending And receiving a second transmission request signal for requesting the second transmission power required for power supply in the second current mode for supplying power to the electric load with the second current value larger than the first current value as the rated current. The second transmission request signal is configured to transmit the second transmission power from the power transmission coil, and when the request signal receiving unit receives the second transmission request signal and the first transmission request signal from the power receiving device. The second transmission power is transmitted by the power control unit according to the configuration, while the first transmission request signal is ignored. With the above configuration, power supply in the first current mode is possible even when the power receiving device does not support such power supply in the second current mode while enabling power supply in the second current mode with higher output. Can be used safely.

  Furthermore, according to the twelfth power supply stand, the power control means is a first power mode in which the request signal receiving means supplies power to the electric load using the first power value as the rated power instead of the first current value. When the first transmission request signal for requesting the first transmission power required for power supply is received, the first transmission power is transmitted from the power transmission coil, and instead of the second current value, the first power value When receiving a second transmission request signal for requesting the second transmission power required for power supply in the second power mode for supplying power to the electrical load, with the second power value having a larger value as the rated power, It can be configured to transmit transmitted power. With the above-described configuration, it is possible to accurately determine whether or not to supply power, not only using the current value but also using the power value.

  Furthermore, according to the thirteenth contactless power supply method, there is provided a contactless power supply method in which power is supplied from a power supply base without contact to a power receiving device having an electrical load, the power receiving coil of the power receiving device. In a state in which power is transmitted from the power transmission coil to the power receiving coil in an electromagnetically coupled state to the power transmission coil of the power supply stand, and the power receiving device receives the electric power by the power received by the power receiving coil. Based on the detected power reception side detection current or power reception side detection power and the detected power reception side detection current or power reception side detection power, power is transmitted from the power supply base to the power reception device. The power control means transmits power from the power transmission coil to the power receiving coil in accordance with the step of transmitting a power transmission request signal instructing to increase or decrease the amount of transmitted power to the power supply stand, and the power transmission request signal. Adjusting the amount of transmitted power, and the power receiving device uses, as a power transmission request signal, the first transmitted power necessary for power supply in the first current mode for supplying power to the electric load using the first current value as the rated current. The second transmission power required for power supply in the second current mode for supplying power to the electric load using the first transmission request signal to request and the second current value larger than the first current value as the rated current. The power transmission request signal is transmitted to the power supply stand together, and the power supply stand receives the second power transmission request signal and the first power transmission request signal from the power receiving device in this order, according to the second power transmission request signal. While transmitting the second transmitted power to the power receiving device, the first transmission request signal can be ignored. As a result, it is possible to supply power in the second current mode with higher output, but even if the power supply base or the power receiving device does not support such power supply in the second current mode, Therefore, it can be safely used.

  Furthermore, according to the fourteenth contactless power supply method, there is provided a contactless power supply method in which electric power is transmitted from a power supply base in a contactless manner to a power receiving device having an electrical load, the power receiving coil of the power receiving device. In a state in which power is transmitted from the power transmission coil to the power receiving coil in an electromagnetically coupled state to the power transmission coil of the power supply stand, and the power receiving device receives the electric power by the power received by the power receiving coil. Based on the detected power reception side detection current or power reception side detection power and the detected power reception side detection current or power reception side detection power, power is transmitted from the power supply base to the power reception device. The power control means transmits power from the power transmission coil to the power receiving coil in accordance with the step of transmitting a power transmission request signal instructing to increase or decrease the amount of transmitted power to the power supply stand, and the power transmission request signal. Adjusting the amount of transmitted power, wherein the power receiving device supplies, as a power transmission request signal, a first current value according to a standardized non-contact charging method as a rated current to supply power to an electric load. The first transmission request signal for requesting the first transmission power necessary for power supply in the second current value according to the non-standard contactless charging method larger than the first current value, as the rated current, The second transmission request signal for requesting the second transmission power required for power supply in the second current mode for supplying power to the electric load, in the order of the second transmission request signal and the first transmission request signal to the power supply stand And when the power supply stand does not support power transmission in the second current mode, the power supply base receives the first power transmission request signal and feeds the first transmitted power to the power receiving device according to the signal, If it supports power transmission in current mode, Two power transmission request signal and the first transmission request signal to receive, while transmitting the second transmission power to the power receiving device according to the second transmission request signal, it is possible to ignore the first transmission request signal. With the above configuration, power supply in the second current mode with higher output is possible, but even if the power supply stand side does not support power supply in the second current mode, power supply in the first current mode is possible. Can be used safely.

  Furthermore, according to the fifteenth contactless power supply method, there is provided a contactless power supply method in which power is supplied to a power receiving device having an electrical load by contactless power transmission from a power supply stand, wherein the power receiving coil of the power receiving device In a state in which power is transmitted from the power transmission coil to the power receiving coil in an electromagnetically coupled state to the power transmission coil of the power supply stand, and the power receiving device receives the electric power by the power received by the power receiving coil. Based on the detected power reception side detection current or power reception side detection power and the detected power reception side detection current or power reception side detection power, power is transmitted from the power supply base to the power reception device. The power control means transmits power from the power transmission coil to the power receiving coil in accordance with the step of transmitting a power transmission request signal instructing to increase or decrease the amount of transmitted power to the power supply stand, and the power transmission request signal. Adjusting the amount of transmitted power, wherein the power supply base supplies a first current value according to a standardized non-contact charging method to the electric load from the power receiving device as a rated current. When the first transmission request signal for requesting the first transmission power required for power supply is received, the first transmission power is transmitted from the power transmission coil and is larger than the first current value, which is not standardized. When the second current value according to the non-contact charging method is used as the rated current, when the second transmission request signal for requesting the second transmission power required for power supply in the second current mode for supplying power to the electric load is received, When the second transmission power is transmitted from the power transmission coil and the second transmission request signal and the first transmission request signal are received in this order, the second transmission power is transmitted to the power control unit according to the second transmission request signal. While the first power transmission request It can be configured to ignore the issue. With the above configuration, power supply in the first current mode is possible even when the power receiving device does not support such power supply in the second current mode while enabling power supply in the second current mode with higher output. Can be used safely.

1 is a block diagram showing a contactless charging system according to Embodiment 1. FIG. It is a block diagram which shows the non-contact charge system which concerns on Embodiment 2. FIG. FIG. 6 is a block diagram showing a contactless charging system according to a third embodiment. It is a schematic diagram which shows the combination which mounts the battery built-in apparatus corresponding to 5W and 5W / 10W on the charging stand corresponding to 5W or 5W / 10W, respectively. It is a schematic diagram which shows a mode that it communicates from a battery built-in apparatus with the charging stand and battery built-in apparatus which concern on this Embodiment. FIG. 5 is a block diagram illustrating a state where a charging stand performs power transmission control on a battery built-in device in each combination of FIG. 4. It is a graph which shows the VI characteristic for performing the constant current and constant voltage charge of a receiving device in 1st charge mode. It is a graph which shows the VI characteristic for performing constant current and constant voltage charge of a receiving device in 2nd charge mode. 6 is a timing chart illustrating a state in which communication is performed from a power receiving device to a power supply stand in the non-contact power supply system of FIG. 5. It is a flowchart which shows the operation | movement at the time of the power reception in a power receiving apparatus. It is a flowchart which shows the operation | movement at the time of the electric power feeding in a feed stand. It is a perspective view which shows the conventional non-contact charging stand and a mobile phone. It is a schematic diagram which shows a mode that a battery built-in apparatus is charged with the charging stand according to the standard which performs non-contact charge. It is a schematic diagram which shows a mode that it communicates with the apparatus with a built-in battery from the charging stand which also enabled the non-standard charge while following the standard of non-contact charge.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. However, the embodiments described below exemplify a non-contact power supply system, a power receiving device, a power supply stand, and a non-contact power supply method for embodying the technical idea of the present invention. The system, power receiving device, power supply stand, and contactless power supply method are not specified as follows. In particular, in this specification, in order to facilitate understanding of the scope of claims, the numbers corresponding to the members shown in the embodiments are referred to as “claims” and “means for solving the problems”. However, the members shown in the claims are not limited to the members in the embodiments. In particular, the dimensions, materials, shapes, relative arrangements, and the like of the constituent members described in the embodiments are not intended to limit the scope of the present invention only to the description unless otherwise specified. It is just an example. Note that the size, positional relationship, and the like of the members shown in each drawing may be exaggerated for clarity of explanation. Furthermore, in the following description, the same name and symbol indicate the same or the same members, and detailed description thereof will be omitted as appropriate. Furthermore, each element constituting the present invention may be configured such that a plurality of elements are constituted by the same member and the plurality of elements are shared by one member, and conversely, the function of one member is constituted by a plurality of members. It can also be realized by sharing. In addition, the contents described in some examples and embodiments may be used in other examples and embodiments.
(Embodiment 1)

  FIG. 1 is a block diagram showing a non-contact power feeding system 100 according to Embodiment 1 of the present invention. The power supply stand 10 shown in this figure conveys power to the power receiving device 50 by a non-contact power supply method. In the figure, a state is shown in which the power receiving device 50 is placed on the power supply base 10 and power is supplied from the power supply base 10 to the power reception device 50. In this embodiment, the power supply base 10 is a charging base, the power receiving device 50 is a battery built-in device, and power is supplied from the charging stand to the battery built-in device to charge the secondary battery 52 of the battery built-in device. .

  The present invention does not specify the power supply stand as a charging stand or the power receiving device as a battery built-in device. The power receiving device can drive the power of the power receiving device as a lighting fixture or a charging adapter by supplying power from the power supply stand to the power receiving device. For example, when the power receiving device is a lighting device, the light source is turned on with power supplied from the power supply stand. When the power receiving device is a charge adapter, the battery connected to the charge adapter is supplied with power supplied from the power supply stand. Supply the battery charging power to the internal device to charge the battery of the internal battery device. The power receiving device may be a battery pack.

  In the power supply stand 10, an upper surface plate 21 on which the power receiving device 50 is set and placed at a fixed position is provided on the upper surface of the case 20, and the power transmission coil 11 is disposed inside the upper surface plate 21. The power transmission coil 11 is connected to an AC power source 12 and controls the AC power source 12 by a power control means 13.

  The power control unit 13 controls the AC power supply 12 with an increase / decrease request signal transmitted from the power receiving device 50 to adjust the power supplied to the power transmission coil 11. The power control means 13 increases the output power from the AC power supply 12 to the power transmission coil 11 with the increase request signal input from the request signal reception means 14, and decreases the output to the power transmission coil 11 with the decrease request signal. The requested power requested from the device 50 is supplied. The power control means 13 adjusts the output of the AC power supply 12 to the maximum output as follows, or adjusts it below the preset set power. The power control means 13 increases the output of the AC power supply 12 by the increase request signal. In the state where the output of the AC power supply 12 is increased to the maximum power or the set power, even if the increase request signal is detected, The output of the AC power supply 12 is not increased.

  The power supply base 10 electromagnetically couples the power transmission coil 11 to the power reception coil 51, and carries power, that is, supplies power from the power transmission coil 11 to the power reception coil 51. The power supply base 10 that charges the secondary battery 52 by setting the power receiving device 50 at a free position on the top plate 21 incorporates a moving mechanism 16 that moves the power transmission coil 11 so as to approach the power reception coil 51. . In the power supply stand 10, the power transmission coil 11 is disposed below the upper surface plate 21 of the case 20 and moved along the upper surface plate 21 to approach the power reception coil 51.

The power supply base 10 and the power receiving device 50 can be provided with a positioning unit mechanism that sets the power receiving device 50 at a fixed position of the power supply stand 10, and the power receiving device 50 can be set at a fixed position of the power supply stand 10. The positioning unit mechanism sets the power receiving device 50 at a fixed position of the power supply base 10 so that the power receiving coil 51 approaches the power transmitting coil 11. The power receiving coil 51 that approaches the power transmitting coil 11 carries power from the power transmitting coil 11 to the power receiving coil 51 by electromagnetic induction to supply power.
(Embodiment 2)

  In the above example, the configuration in which the power transmission coil 11 is moved in the horizontal plane by the moving mechanism 16 on the inner surface of the upper surface plate 21 has been described. However, it is also possible to use a power supply stand with a fixed power transmission coil. Such an example is shown in FIG. The non-contact power feeding system 200 shown in this figure includes a power feeding base 10 ′ and a power receiving device 50. The power supply base 10 ′ uses a fitting structure in which the power receiving device 50 is set at a fixed position of the power supply base 10 ′ as the positioning unit mechanism 22 for electromagnetically coupling the power transmission coil 11 to the power reception coil 51. The fitting structure of FIG. 2 is provided with a fitting recess 23 into which the power receiving device 50 is fitted on the upper surface of the power supply base 10 ′, and the power receiving device 50 is put in the fitting recess 23 and set at a fixed position. Although not shown, the positioning unit mechanism can also set the power receiving device at a fixed position of the power supply base by providing concavity and convexity of the fitting structure on the opposing surface of the power supply base and the power receiving device. The fitting structure can prevent displacement of the power receiving device.

  The power transmission coil 11 is a planar coil wound in a spiral shape on a surface parallel to the upper surface plate 21, and radiates an alternating magnetic flux above the upper surface plate 21. The power transmission coil 11 radiates an alternating magnetic flux orthogonal to the upper surface plate 21 above the upper surface plate 21. The power transmission coil 11 is supplied with AC power from the AC power source 12 and radiates AC magnetic flux above the upper surface plate 21. The power transmission coil 11 can increase the inductance by winding a wire around a core (not shown) made of a magnetic material. The power transmission coil with the core can concentrate the magnetic flux to a specific part and efficiently transmit power to the power reception coil. However, the power transmission coil does not necessarily need to be provided with a core, and may be an air-core coil. Since the air-core coil is light, the moving mechanism can be simplified in the structure in which the power transmission coil is moved on the inner surface of the top plate. The power transmission coil 11 is substantially equal to the outer diameter of the power reception coil 51 and efficiently conveys power to the power reception coil 51.

  The AC power supply 12 adjusts the power supplied to the power transmission coil 11 by the power control means 13 and supplies, for example, high frequency power of 20 kHz to 1 MHz to the power transmission coil 11. The power supply stand 10 that moves the power transmission coil 11 so as to approach the power reception coil 51 connects the AC power supply 12 to the power transmission coil 11 via a flexible lead wire. The AC power supply 12 includes an oscillation circuit and a power amplifier that amplifies the AC output from the oscillation circuit.

  The power supply base 10 supplies AC power to the power transmission coil 11 with the AC power supply 12 in a state where the power transmission coil 11 is brought close to the power reception coil 51. The AC power of the power transmission coil 11 is transmitted to the power reception coil 51 to charge the secondary battery 52. The power supply base 10 stops the power supply to the power transmission coil 11 by a signal transmitted from the power receiving device 50 in a state in which the secondary battery 52 is fully charged, foreign matter is detected, or abnormality is determined. The charging of the battery 52 is stopped.

  The power receiving device 50 in FIGS. 1 and 2 is a battery built-in device 5 and includes a power receiving coil 51 that is electromagnetically coupled to the power transmitting coil 11 of the power supply base 10. The secondary battery 52 is charged with the received power induced by the power receiving coil 51. Accordingly, the power receiving device 50 in FIG. 1 includes a secondary battery 52, a power receiving coil 51, a rectifier circuit 56 that converts alternating current induced in the power receiving coil 51 into direct current, and a direct current that is output from the rectifier circuit 56. The power receiving side control means 53 for adjusting the charging current and voltage for charging the secondary battery 52, the transmission circuit 54 for transmitting the information signal of the power receiving device 50 to the power supply base 10, and the received power from the output of the rectifier circuit 56 are detected. The detection circuit 55 includes a detection circuit 55 that detects the increase / decrease request signal by comparing the received power with the required power that is necessary for charging the secondary battery 52 and detects a foreign matter from the increase / decrease request signal.

  The secondary battery 52 is a lithium ion battery or a lithium polymer battery. However, the battery can be any rechargeable battery such as a nickel metal hydride battery or a nickel cadmium battery. The power receiving device 50 includes one or a plurality of secondary batteries 52. The plurality of secondary batteries 52 are connected in series or in parallel, or connected in series and in parallel.

  The rectifier circuit 56 full-wave rectifies the alternating current induced in the power receiving coil 51 with a diode bridge, and smoothes the pulsating current with a smoothing capacitor. The rectifier circuit rectifies alternating current with a diode bridge, but a synchronous rectifier circuit can be used for the rectifier circuit in which an FET is connected to the bridge and the FET is switched on and off in synchronization with the alternating current. The synchronous rectification circuit of the FET has a small on-resistance, reduces the heat generation of the rectification circuit, and can reduce the increase in the temperature inside the case of the power receiving device 50. Further, the smoothing capacitor is not always necessary, and the battery can be charged by the output of the diode bridge or the synchronous rectifier circuit.

The power receiving side control means 53 charges a lithium ion battery, a lithium polymer battery or the like at a constant voltage / constant current, and charges a nickel metal hydride battery or a nickel cadmium battery at a constant current. Further, the power receiving side control means 53 detects the full charge of the secondary battery 52 and transmits a full charge signal to the power supply base 10 via the transmission circuit 54. The power supply stand 10 detects the full charge signal transmitted from the transmission circuit 54 and the information signal of the power receiving device 50 by the request signal receiving unit 14. The power supply stand 10 detects an information signal from the power receiving device 50 and controls the AC power supply 12 by the power control means 13. When the power supply stand 10 detects the full charge signal, the power supply stand 10 stops the power supply to the power transmission coil 11.
(Embodiment 3)

  In the example of FIGS. 1 and 2, the example in which the secondary battery 52 is charged using the charge control unit as the power receiving side control unit has been described. However, the present invention is not limited to the example in which the received power is used for charging the secondary battery, and can also be used as power for driving the electric load of the power receiving device. An example of such a non-contact power feeding system is shown in FIG. In the non-contact power feeding system 300 shown in this figure, the power receiving device 50 includes load drive control means 53B that supplies power for driving an electric load instead of the charge control means as the power receiving side control means. Other members can use the same configuration as in the first and second embodiments described above. The load drive control unit 53B converts the electric power to drive the electric load LD of the power receiving device 50. For example, a mobile phone, kitchenware, or a lighting device can be used as the electrical load of the power receiving device 50. In this way, the received power can be directly used for driving power of the electric load in addition to charging the secondary battery. If a secondary battery is used as the electrical load, the configuration of the first or second embodiment described above is obtained. It is also possible to adopt a configuration that uses the received power for both driving the electrical load and charging the secondary battery.

  The transmission circuit 54 supplies power to the power supply base 10 from the power receiving device 50, an increase / decrease request signal including an increase request signal and a decrease request signal for increasing or decreasing the output of the power supply base 10, a full charge signal for the secondary battery 52, and charging. Various information signals such as the voltage of the secondary battery 52, the charging current, the battery temperature, the battery serial number, the allowable charging current for specifying the charging current of the battery, the battery information such as the allowable temperature for controlling the charging of the battery, etc. It is transmitted to the power supply stand 10. The transmission circuit 54 changes various load impedances of the power reception coil 51 and transmits various information signals to the power transmission coil 11. Although not shown, the transmission circuit 54 has a modulation circuit connected to the power receiving coil 51. The modulation circuit connects a load such as a capacitor and a resistor and a switching element in series, controls on / off of the switching element, and transmits various information signals to the power supply base 10.

  The request signal receiving means 14 of the power supply stand 10 detects an information signal transmitted from the transmission circuit 54 by detecting an impedance change, a voltage change, a current change and the like of the power transmission coil 11. When the load impedance of the power receiving coil 51 changes, the impedance, voltage, and current of the power transmitting coil 11 that is electromagnetically coupled to the power receiving coil 51 change. Therefore, the request signal receiving unit 14 detects these changes and receives the power receiving device 50. It is possible to detect the information signal.

  However, the transmission circuit may be a circuit that modulates and transmits a carrier wave, that is, a transmitter. The request signal receiving means for the information signal transmitted from the transmission circuit is a receiver that receives the carrier wave and detects the information signal. The transmission circuit and the request signal receiving means can have all circuit configurations capable of transmitting an information signal from the power receiving device to the power supply base.

  The detection circuit 55 compares the received power output from the rectifier circuit 56 with the required power at a predetermined period and outputs an increase / decrease request signal, and determines foreign object detection from the increase request signal of the comparison unit 55A. And a determination unit 55B. Note that the foreign object detection can be determined not on the power receiving device side but on the power supply stand side. In this case, for example, the voltage and charging current of the secondary battery are notified from the power receiving device side to the power supply stand, and when the transmission efficiency is lower than the reference value compared to the transmission power on the power supply stand side, it is determined that there is a foreign object. Then stop power transmission.

  The comparison unit 55A detects the received power from the product of the output voltage and current of the rectifier circuit 56, compares the detected received power with the required power, and outputs an increase / decrease request signal. 55 A of comparison parts detect the electric power required in order to charge the secondary battery 52 as request | requirement electric power. 55 A of comparison parts detect the kind of secondary battery 52, battery voltage, the electric current to charge, etc., and the electric power required in order to charge the secondary battery 52, ie, required electric power. Since the lithium ion battery and the lithium polymer battery are charged with constant voltage / constant current characteristics, the charging current decreases as the secondary battery 52 approaches full charge. Therefore, the required power is reduced as the secondary battery 52 approaches full charge. 1 and 2, the power receiving device 50 is used as a battery built-in device, and the secondary battery 52 is charged with power consumption. The power receiving device 50 uses the required power as charging power for the secondary battery 52, but the power receiving device is not necessarily limited to a battery built-in device. A power receiving device that is not a battery built-in device detects the required power as load power consumption or rated power.

The increase / decrease request signal is an increase request signal for increasing the output of the power supply base 10 and a decrease request signal for decreasing the output. The comparison unit 55A detects that the received power is smaller than the required power and outputs an increase request signal, detects that the received power is larger than the required power, and outputs a decrease request signal. The comparison unit 55A compares the received power with the required power and outputs an increase / decrease request signal composed of an increase request signal or a decrease request signal so that the optimum power can be supplied to the electric load.
(High output)

  In the power supply stand described above, the maximum amount of power for power transmission, that is, power transmission is defined in advance. Similarly, in the battery built-in device, the amount of power that can be received at the time of power feeding is specified in advance. In particular, a standard for contactless power supply is defined so that contactless power supply is possible between different devices. In general, the Qi standard established by WPC (Wireless Power Consortium) is known as an international standard. According to the low power specification standard (Volume I: Low Power) of the same standard, the power supply is limited to a maximum of 5W.

However, with the recent increase in the screen size of power receiving devices typified by tablet devices (slate PCs) and the increase in driving power associated with higher performance, the capacity of batteries driving the power receiving devices has been increasing. As the battery capacity increases, the charging time becomes longer. On the other hand, there is a strong demand for shortening the charging time as much as possible to increase the operating time. In order to respond to this, it is necessary to increase the amount of power during charging. Here, if a charging stand or a battery built-in device that can be charged with a non-standard large current can be designed, it can be charged only in a specific combination, and the usability is deteriorated. Therefore, it is conceivable to design a charging stand and a battery built-in device that are compatible with existing standards such as the Qi standard. Here, 5W / 10W compatible with Qi standard 5W charging while supporting higher power, for example, 10W charging, for 5W compatible charging stand and battery built-in device compatible with Qi standard When the charging stand and the battery built-in device are introduced, considering the compatibility with the existing charging stand and the battery built-in device, a combination as shown in FIG. 4 can be considered. Thus, in the combination of FIG.
(1) When charging the battery built-in device 50A for 5W on the charging base 10A for 5W,
(2) When charging the battery built-in device 50A for 5W on the charging base 10B for 5W / 10W,
(3) When charging the battery built-in device 50B compatible with 5W / 10W on the charging stand 10A compatible with 5W,
(4) When charging the battery built-in device 50B compatible with 5W / 10W on the charging stand 10B compatible with 5W / 10W,
There are four possible ways. Among them, (1) the combination of the 5W-compatible battery-equipped device 50A and the 5W-compatible charging base 10A is a combination of a conventional battery-equipped device and a charging base, and thus operates without problems. Further, (4) the combination of the 5W / 10W compatible battery built-in device 50B and the 5W / 10W compatible charging base 10B is also a combination of devices compatible with the original standard 10W, and thus operates without any problem.

  On the other hand, (2) In the combination of the 5W battery built-in device 50A and the 5W / 10W compatible charging stand 10B, the battery built-in device 50A requires the charging stand side to supply 5W of transmission power corresponding to the conventional standard. By doing so, it can be charged correctly. In other words, with this combination, the battery built-in device 50A cannot obtain transmission power of 5 W or more, and only charging with low power is possible.

  However, (3) when the battery built-in device 50B compatible with 5W / 10W is placed on the charging stand 10A compatible with 5W, the battery built-in device 50B compatible with 5W / 10W is charged with 10W power for charging with 5W. When it is calculated for the base 10A, the transmission power is not enough at 5W, and as a result of requesting that it be increased more than this, as seen from the charging base side, it becomes a state where power exceeding the specified value is continuously required, It is erroneously determined that a foreign object is placed, and charging is stopped. As a result, there is a possibility that charging cannot be performed. In particular, in the Qi standard, only communication from the receiver (battery built-in device) side to the transmitter (charging stand) side is prescribed, and conversely, communication from the charging stand to the battery built-in device side is not prescribed. Control such as acquiring the specifications of the charging stand on the built-in device side and adjusting the amount of power required on the charging stand side according to this was not possible.

  In order to avoid this, for example, as shown in FIG. 14, communication from the power supply base 1410 to the power receiving device 1450 side is performed by a nonstandard original method, and the power supply base 1410 and the power receiving device 1450 correspond to each other in an original method. If it is confirmed that the power supply is confirmed, it is considered that power supply is performed at a high output, and if any one of them cannot be confirmed, only charging according to the standard is performed. However, in this method, it is necessary to provide communication facilities for performing communication from the power supply base 1410 side to the power receiving device 1450 side in both the power supply base 1410 and the power receiving device 1450, which requires an additional member and reduces manufacturing costs. Soaring and complications. In particular, the Qi standard currently defines only communication from the power receiving device side to the power supply stand side, and does not stipulate communication from the power supply stand side in the reverse direction to the power receiving device side. It is necessary to add, and it is necessary to change the configuration on the hardware. In other words, it is difficult to apply to existing facilities.

  Therefore, in the present embodiment, as shown in FIG. 5, while performing communication from the power receiving device 50 side to the communication proxy side, in addition to the first power transmission request signal according to the Qi standard, A second power transmission request signal according to the standard is also transmitted. When the power supply stand 10 side can receive the second power transmission request signal, the first power transmission request signal is ignored or the processing specified by the signal is not performed. In this way, in the case of a power supply stand that only supports the Qi standard, the first power transmission request signal can be interpreted, and power is supplied accordingly. On the other hand, the second power transmission request signal is not compatible with the original standard. As a result, only Qi standard charging is performed. Moreover, in the case of a charging stand that supports both the Qi standard and the original standard, the second power transmission request signal is processed, while the first power transmission request signal is not processed. As a result, when charging the 5W / 10W battery built-in device 50B with the 5W / 10W compatible charging base 10B as shown in FIG. 4 (4), the charging base 10B receives the second power transmission request signal. Since the first power transmission request signal corresponding to the Qi standard is not executed, only the charging corresponding to the high output according to the original standard is executed.

  With this method, when the power supply base is compatible only with the Qi standard or when the power supply base is compatible with both the Qi standard and the original standard, it can be appropriately charged by the respective charging methods. In addition, there is no need to add a new member such as a facility for communication from the power supply stand side to the power receiving device side, and it is only necessary to perform communication from the existing power receiving device side to the power supply stand side. Therefore, it can be easily applied to the device, and the advantage that it can be mounted at low cost is obtained.

  In the example of FIG. 5, an example in which the communication according to the standard is the Qi standard has been described. However, the present invention is not limited to this, and a communication method standardized with respect to other contactless charging methods or standardization Even if it is not, a practically standard communication method widely adopted can be adopted as appropriate.

Here, how the power supply base 10 performs power transmission control on the power receiving device 50 in each combination of FIG. 4 will be described based on the block diagram of FIG. 6. The power supply stand 10 shown in this figure includes a power transmission coil 11 for electromagnetically coupling with the power receiving coil 51 to transmit power, a request signal receiving means 14 for receiving a power transmission request signal transmitted from the request signal transmitting means 57, Based on the power transmission request signal received by the request signal receiving means 14, a power control means 13 for controlling the amount of transmitted power transmitted from the power transmission coil 11 is provided.
(Power receiving device 50)

  On the other hand, the power receiving device 50 includes a power receiving coil 51, an electric load LD, a power value acquisition unit 58, and a request signal transmission unit 57. The electric load LD includes, for example, a secondary battery 52 and a power receiving side control unit 53 that controls a charging current for charging the secondary battery 52. The power value acquisition unit 58 detects the power receiving side detection power actually obtained on the power receiving device 50 side. The request signal transmission unit 57 transmits a power transmission request signal for instructing the amount of transmitted power transmitted from the power supply base 10 to the power receiving device 50 based on the power reception side detected power detected by the power value acquisition means 58. Send to. The request signal transmission means 57 can use the transmission circuit 54 shown in FIGS. In the example of FIG. 6, the power value acquisition unit 58 and the request signal transmission unit 57 are separate members, but they can be configured by a single IC or the like. The power transmission request signal is transmitted to the power supply base 10 via the power receiving coil 51 according to an instruction from the request signal transmission unit 57.

Each of the power supply base 10 and the power receiving device 50 includes one corresponding to only one type of contactless charging standard (for example, Qi standard) and one corresponding to a plurality of types of contactless charging standards. As shown in FIG. Here, the combination (4) will be mainly described.
(Power receiving side control means 53)

The power receiving side control means 53 of the power receiving device 50 shown in FIG. 6 has a first current mode in which the first current value can be supplied to the electric load LD as a rated current, and a second current value larger than the first current value. It is possible to switch the second current mode in which power can be supplied with the rated current as.
(Request signal transmission means 57)

  The request signal transmission unit 57 compares the power-receiving-side detection power value detected by the power value acquisition unit 58 with a predetermined value, and if it is lower than the predetermined value, a power increase request signal that instructs to increase the transmission power Is transmitted to the power supply base 10 as a power transmission request signal. On the other hand, if it is higher than this predetermined value, a power reduction request signal instructing to reduce the transmission power is transmitted to the power supply base 10 as a power transmission request signal. This makes it possible to charge appropriately according to the transmitted power that is actually transmitted. As such a power transmission request signal, a standardized signal can be preferably used. For example, in the case of the Qi standard, a control error signal for 5W can be used. Thereby, the secondary battery according to the Qi standard can be charged.

  Further, the request signal transmission means 57, according to the first current mode and the second current mode, as a power transmission request signal, a first power transmission request signal for requesting the first transmission power required for power supply in the first current mode, It is possible to transmit a second transmission request signal for requesting the second transmission power necessary for power supply in the second current mode. For example, as a power supply to the electric load LD, consider a case where charging of the secondary battery is performed according to the Qi standard and an original standard capable of charging at a higher output than this. At the time of charging in the first current mode, as shown in FIG. 7, the first current value is set to 700 mA, and charging is performed below this current. Further, the secondary battery can be charged to a predetermined voltage. The predetermined voltage is about 7V because 5 W is rated according to the low power specification (Volume I: Low Power) of the Qi standard, for example. In the second current mode, as shown in FIG. 8, the secondary battery is charged with a second current value of 1 A so that the secondary battery has a predetermined voltage.

The request signal transmission unit 57 simultaneously transmits a first power transmission request signal and a second power transmission request signal to the power supply base 10. Preferably, as shown in FIG. 9, the first power transmission request signal and the second power transmission request signal are transmitted in a time division manner. As a result, two types of power transmission request signals can be transmitted by one request signal transmission means, so that the transmission mechanism is shared and the configuration is simplified without separately preparing transmitters for transmitting the respective power transmission request signals. Can be achieved. The first power transmission request signal and the second power transmission request signal are updated every 250 μs, for example.
(Power control means 13)

  On the other hand, when the request signal receiving unit 14 receives the first power transmission request signal, the power supply base 10 transmits power to the power receiving device 50 with the first transmitted power. When receiving the second transmission request signal, the second transmission power is transmitted. Switching between these transmission powers is performed by the power control means 13. Here, the first transmission power is 5 W corresponding to the Qi standard. The second transmitted power can be set to 10 W, for example, as a unique standard.

  As described above, the request signal transmission unit 57 of the power receiving device 50 constantly transmits the second power transmission request signal and the first power transmission request signal as shown in FIG. And when the power supply stand 10 respond | corresponds to 2nd transmitted power, if the request signal receiving means 14 receives a 2nd power transmission request signal and a 1st power transmission request signal, according to a 2nd power transmission request signal, 2nd transmitted power Is transmitted by the power control means 13, while the first transmission request signal is ignored. By doing so, it is possible to supply power in the second current mode with higher output.

On the other hand, even when one or both of the power supply base 10 and the power receiving device 50 do not support such power supply in the second current mode, power supply in the first current mode can be performed and used safely. It becomes possible. In addition, this method can be easily applied to existing non-contact charging, so that an advantage that it can be mounted at low cost without adding a new member can be obtained.
(First transmission request signal)

  The first power transmission request signal can be a standardized power transmission request signal. For example, in the case of the Qi standard, a 5 W control error (control error) signal can be used. Thereby, the secondary battery according to the Qi standard can be charged.

  On the other hand, the increase request signal for the second power is a power transmission request signal corresponding to charging at an arbitrary power value, which is not based on such a standard.

In this example, in order to simplify the description, a combination of the charging base 10B and battery built-in device 50B compatible with 5W / 10W, and the charging base 10A compatible with 5W and battery built-in device 50A will be described. However, in the present invention, the power value is not limited to 5 W or 10 W. For example, a charging stand or a battery built-in device that can be charged with high power of 15 W or 20 W or more may be used. In addition, the standard for contactless charging is not limited to the Qi standard, and the present invention can be applied to a charging stand and a battery built-in device corresponding to other contactless charging standards. Furthermore, as a contactless (wireless) charging method, a magnet attraction type, a coil array type, and the like can be used as appropriate in addition to a movable coil type.
(Power transmission control from the battery built-in device to the charging stand)

Next, the procedure in which the battery built-in device performs power transmission control to the charging stand is based on the flowcharts of FIGS. 10 and 11 for the battery built-in device 50B compatible with 5W / 10W and the charging stand 10B compatible with 5W / 10W. I will explain.
(Battery built-in device operation)

  First, the case of the battery built-in device 50B compatible with 5W / 10W will be described with reference to FIG. First, in step S101, the power value acquisition means 58 shown in FIG. 6 detects the power receiving side detected power value. For example, the receiving side control means 53 measures a charging current value, a charging voltage value, a charging power value, a receiving power value received by the receiving coil 51, or the like for charging the secondary battery, and uses this as the receiving side detection power value. . The detected power-reception-side detected power value is A / D converted and sent to the request signal transmission means 57.

  Next, in step S102, the request signal transmitting unit 57 of the battery built-in device 50B transmits the second power transmission request signal to the request signal receiving unit 14 of the power supply base 10, and in step S103, the first power transmission request signal is transmitted to the power supply base. 10 to send. These power transmission request signals can be performed simultaneously. For example, the second power transmission request signal and the first power transmission request signal can be transmitted by time division as described above. However, the second power transmission request signal is preferably transmitted before the first power transmission request signal. This considers the case where the power supply stand 10 side corresponds to the second power transmission request signal. When the second power transmission request signal is received, the first power transmission request signal that will be subsequently received is ignored. This is because the processing can be scheduled or prepared in advance on the power supply stand 10 side.

  Here, if it is determined that the power receiving side detected power value detected in step S101 does not exceed the predetermined value, a command to increase the transmitted power is included in the power transmission request signal transmitted to the charging stand. When the power transmission request signal is the first power transmission request signal (step S103), it can be a standardized power transmission request signal. For example, in the case of the Qi standard, a control error signal for 5 W can be used. Thereby, the secondary battery according to the Qi standard can be charged.

  Next, it progresses to step S104, it is determined whether the frequency | count of transmission of these 2nd power transmission request signals and the 1st power transmission request signal to the electric power feeding stand 10 side has reached the predetermined number, and when not yet, it returns to step S101 Repeat the above process. That is, the transmission power obtained from the power supply base 10 side is detected again in step S101 by transmitting the second transmission request signal and the first transmission request signal. In this way, the second power transmission request signal and the first power transmission request signal from the battery built-in device 50B to the power supply base 10 side are not transmitted only once, but are repeated a predetermined number of times, thereby causing communication errors such as transmission errors and reception errors. Can be reduced. When the number of communications reaches a predetermined value, the process proceeds to step S105, and the amount of received power is determined. Here, it is determined from the power reception side detected power value detected by the power value acquisition means 58 whether the power supply base 10 has responded to the second power transmission request signal or the first power transmission request signal. Whether the charging base 10A is compatible or the charging base 10B is 10W is identified. Moreover, it can replace with an electric power value and can also determine with a receiving side detection electric current value.

  If it is determined that it is compatible with 10W, the process proceeds to step S107, and the battery built-in device 50B is charged with the rated power of 10W that is the transmitted power corresponding to the second power transmission request signal. If it is determined that the power receiving device 50 is a 5 W battery built-in device 50 </ b> A, the process proceeds to step S <b> 106 and the battery built-in device 50 </ b> B is charged with the rated power of 5 W that is the transmitted power corresponding to the first power transmission request signal. become.

  In this way, in addition to the standardized power transmission request signal, the power transmission request signal of the original standard is also sent to the power supply stand, so that either the charging base 10A that does not comply with the original standard or the charging base 10B that supports the original standard. However, power control can be performed by a power transmission request signal.

  That is, when the charging stand 10A does not support 10W charging, the second power transmission request signal in step S102 cannot be interpreted. Therefore, the processing is not performed in this step, and instead the transmission power for the first power in the next step S103. By processing the request signal, it is possible to correctly charge up to 5 W by controlling the transmission power to be reduced to 5 W or less.

On the other hand, when the charging stand 10B is compatible with 10W charging, the second power transmission request signal in step S102 can be interpreted, so high power of 10W can be executed. Further, in this case, even in the subsequent step S103, even if the transmission power reduction request signal for the first power is transmitted, the charging stand 10B corresponding to 10W charging ignores the transmission request signal so that 10W high power charging is performed. Can continue. In this way, even if the 5W / 10W battery built-in device 50B is placed on any of the 5W charging base 10A and the 5W / 10W charging base 10B, it is possible to use the appropriate charging base for each charging base. It can be charged with electric power.
(Operation of charging stand 10B)

  Next, the operation on the charging stand 10B side corresponding to 5W / 10W will be described based on FIG. First, in step S111, a transmission power request signal from the battery built-in device 50B is received. Here, the transmitted power request signal is received by the request signal receiving means 14 of the charging base 10B from the request signal transmitting means 57 of the battery built-in device 50B or the power receiving coil 51.

  Next, in step S112, it is determined whether the received transmission power request signal includes a transmission power request signal for second power. When the transmission power request signal for the second power is included, the process proceeds to step S113, and the transmission power request signal for the second power is processed. In this case, as described above, even if the transmission power reduction request signal for the first power corresponding to step S103 is transmitted from the battery built-in device 50B, by ignoring this, the second power (for example, 10 W) is ignored. High power charging can be performed.

  On the other hand, when it is not the transmission power request signal for the second power, the process proceeds to step S115, and the transmission power request signal for the first power is processed.

  In either case of step S114 or step S115, after processing, the process returns to step S111 and the same processing is repeated.

  In this way, when the battery built-in device 50B corresponding to high power charging is placed on the charging base 10B corresponding to high power, in addition to correctly charging the battery built-in device 50B, Even in the case of correspondence, since charging with low power is executed, appropriate power feeding is realized. As a result, it is possible to appropriately perform power feeding and charging in any combination of the standard-compliant model and the non-standard-compliant model.

  Further, it is also possible to apply a mechanism for notifying that the device is compatible with 10W from the battery built-in device 50B to the charging stand 10B separately using a unique command. Such a unique command is ignored in the charging stand 10A that does not support the unique standard. By doing so, even if the order of the processing of S54 and S55 is reversed, when the transmission power exceeds 5 W, the first power transmission reduction request signal can be always ignored.

  The contactless power supply system, the power receiving device, the power supply stand, and the contactless power supply method according to the present invention are a method for charging a battery by transferring power from a power supply stand such as a charging stand to a power receiving device such as a battery built-in device by electromagnetic coupling action. It can be used optimally. Further, the present invention can be used not only for a charger but also for a system for supplying electric power to an electric load of a power receiving device and driving it, for example, a kitchen product such as a lighting fixture or a mixer, or a method for supplying power to a charging adapter in a contactless manner.

DESCRIPTION OF SYMBOLS 100, 200, 300 ... Non-contact electric power feeding system 10, 10 '... Feed stand; 10A ... Charging stand corresponding to 5W; 10B ... Charging stand 11 corresponding to 5W / 10W ... Power transmission coil 12 ... AC power supply 13 ... Power control means 14 ... Request signal receiving means 15 ... detection circuit 16 ... moving mechanism 20 ... case 21 ... top plate 22 ... positioning mechanism 23 ... insertion recess 50 ... power receiving device 50A ... 5W compatible battery built-in device; 50B ... 5W / 10W compatible battery built-in Equipment 51 ... Receiving coil 52 ... Secondary battery 53 ... Receiving side control means; 53B ... Load drive control means 54 ... Transmission circuit 55 ... Detection circuit; 55A ... Comparison part; 55B ... Determination part 56 ... Rectification circuit 57 ... Request signal transmission Means 58 ... Power value acquisition means 220 ... Power supply base 221 ... Charging surface 251 ... Power transmission coil 260 ... Power receiving device 261 ... Power reception coil 1310 ... Charging base 1350 ... Reception Electric equipment 1410 ... Feeding stand 1450 ... Power receiving equipment LD ... Electric load

Claims (15)

A power receiving device having an electrical load;
A power supply for supplying power to the power receiving device,
A non-contact power supply system capable of supplying power by transmitting power from the power supply base without contact to the power receiving device,
The power receiving device is:
The electrical load;
A power receiving coil for receiving power from the power supply stand;
Power receiving side control means for controlling driving of the electric load with the received power received by the power receiving coil;
Power value acquisition means for detecting the power receiving side detection power actually obtained on the power receiving device side;
Request signal transmitting means for transmitting a power transmission request signal instructing the amount of transmitted power transmitted from the power supply base to the power receiving device based on the power reception side detected power detected by the power value acquisition means to the power supply base side. And
The power supply stand is
A power transmission coil for electromagnetically coupling with the power receiving coil to transmit power;
Request signal receiving means for receiving a power transmission request signal transmitted from the request signal transmitting means;
Power control means for controlling the amount of transmitted power transmitted from the power transmission coil based on the power transmission request signal received by the request signal receiving means;
The power receiving side control means is configured to
A first current mode capable of supplying power with the first current value as a rated current;
The second current mode capable of supplying power as a rated current with a second current value larger than the first current value is switchable,
The request signal transmission means, as a power transmission request signal,
A first transmission request signal for requesting the first transmission power necessary for power supply in the first current mode;
A second transmission request signal for requesting the second transmission power required for power supply in the second current mode can be transmitted;
The power supply stand is
First transmission power when receiving the first transmission request signal by the request signal receiving means,
The second transmission power when receiving the second transmission request signal can be switched by the power control means,
When receiving the second power transmission request signal and the first power transmission request signal from the request signal transmitting means in the request signal receiving means, while transmitting the second transmitted power in the power control means according to the second power transmission request signal, A contactless power supply system configured to ignore the first power transmission request signal. The contactless power feeding system according to claim 1,
The electrical load is a secondary battery;
The power supply base is a charging base for charging the secondary battery;
A contactless power supply system, wherein the secondary battery can be charged by transmitting power to the power receiving device without contact from the power supply stand. The contactless power supply system according to claim 2,
The first current value is a current value according to a standardized contactless charging method,
A non-contact power supply system, wherein the second current value is a current value according to a non-standardized non-contact charging method. It is a non-contact electric power feeding system according to claim 3,
The first current value is 700 mA,
A non-contact power feeding system, wherein the second current value is 1A. It is a non-contact electric power feeding system as described in any one of Claim 1 to 4,
The non-contact power feeding system according to claim 1, wherein the request signal transmission means is capable of transmitting the first power transmission request signal and the second power transmission request signal in a time-sharing manner. The contactless power feeding system according to any one of claims 1 to 5, further comprising:
A contactless power feeding system comprising: a moving mechanism for moving the power transmission coil within a mounting surface on which the power receiving device is mounted. A contactless power feeding system according to any one of claims 1 to 5,
A non-contact power feeding system, wherein the power transmission coil is fixed. A contactless power supply system according to any one of claims 1 to 7,
The power receiving side control means includes:
Instead of the first current mode, a first power mode capable of feeding the first power value as the rated power,
Changing to the second current mode, it is possible to switch between the second power mode capable of feeding the second power value larger than the first power value as the rated power,
The request signal transmission means, as a power transmission request signal,
A first transmission request signal for requesting the first transmission power necessary for power supply in the first power mode;
A contactless power supply system capable of transmitting a second transmission request signal for requesting second transmission power required for power supply in the second power mode. A power receiving device that can be driven in a contactless manner with electric power transmitted from a power transmission coil built in a power supply stand,
The electrical load;
In order to receive power to supply power to the electrical load, a power receiving coil that can be electromagnetically coupled to the power transmitting coil,
Power receiving side control means for controlling driving of the electric load with the received power received by the power receiving coil;
Power value acquisition means for detecting the power receiving side detection power actually obtained on the power receiving device side;
Request signal transmitting means for transmitting a power transmission request signal instructing the amount of transmitted power transmitted from the power supply base to the power receiving device based on the power reception side detected power detected by the power value acquisition means to the power supply base side. And
The power receiving side control means is configured to
A first current mode capable of supplying power with the first current value as a rated current;
The second current mode capable of supplying power as a rated current with a second current value larger than the first current value is switchable,
The request signal transmission means, as a power transmission request signal,
A second transmission request signal for requesting second transmission power required for power supply in the second current mode, and a first transmission request signal for requesting first transmission power required for power supply in the first current mode following this Can be transmitted. The power receiving device according to claim 9,
The power receiving side control means includes:
Instead of the first current mode, a first power mode capable of feeding the first power value as the rated power,
Changing to the second current mode, it is possible to switch between the second power mode capable of feeding the second power value larger than the first power value as the rated power,
The request signal transmission means, as a power transmission request signal,
A second transmission request signal for requesting second transmission power required for power supply in the second power mode, and a first transmission request signal for requesting first transmission power required for power supply in the first power mode following this Can be transmitted. A power supply stand that can transmit power to a power receiving device having an electrical load without contact,
A power transmission coil that is electromagnetically coupled to a power reception coil incorporated in the power reception device to supply power to the power reception device;
A request signal receiving means for receiving a transmission request signal transmitted from the power receiving device and instructing a transmission power amount transmitted from the power supply to the power receiving device;
Power control means for controlling the amount of power transmitted from the power transmission coil based on the power transmission request signal received by the request signal receiving means;
The power control means is the request signal receiving means,
When receiving a first transmission request signal for requesting the first transmission power required for power supply in the first current mode for supplying power to the electric load with the first current value as the rated current, the first transmission power is transmitted from the power transmission coil. Power transmission,
When the second current value larger than the first current value is set as the rated current, when receiving the second transmission request signal for requesting the second transmission power required for power supply in the second current mode for supplying power to the electric load, Configured to transmit the second transmitted power from the power transmission coil,
When the request signal receiving means receives the second power transmission request signal and the first power transmission request signal from the power receiving device, the second power transmission power is transmitted by the power control means according to the second power transmission request signal. A power supply stand configured to ignore one power transmission request signal. The power supply stand according to claim 11,
The power control means is the request signal receiving means,
In place of the first current value, the first power value as the rated power, when receiving a first transmission request signal for requesting the first transmission power required for power supply in the first power mode for supplying power to the electrical load, Transmitting the first transmitted power from the power transmission coil,
Instead of the second current value, the second power transmission requesting the second transmission power required for power feeding in the second power mode for feeding the electric load with the second power value larger than the first power value as the rated power. A power supply stand configured to transmit second transmission power from the power transmission coil when receiving a request signal. A non-contact power supply method for supplying power by transmitting power from a power supply stand without contact to a power receiving device having an electrical load,
A step of transmitting power from the power transmission coil to the power reception coil in a state where the power reception coil of the power reception device is electromagnetically coupled to the power transmission coil of the power supply base;
The power receiving device starts power feeding to the electric load based on the received power received by the power receiving coil, and detects a power receiving side detection current or a power receiving side detection power;
A step of transmitting a power transmission request signal instructing increase / decrease in the amount of transmitted power transmitted from the power supply base to the power receiving device based on the detected power reception side detection current or power reception side detection power;
Adjusting the amount of transmitted power transmitted from the power transmission coil to the power reception coil in accordance with the power transmission request signal;
The power receiving device, as a power transmission request signal,
A first transmission request signal for requesting a first transmission power required for power supply in a first current mode for supplying power to an electrical load with a first current value as a rated current;
A second current value larger than the first current value as a rated current and a second transmission request signal for requesting a second transmission power required for power supply in a second current mode for supplying power to an electric load. Send it to the powerhouse,
The power supply stand receives the second power transmission request signal and the first power transmission request signal in this order from the power receiving device, while transmitting the second transmitted power to the power receiving device according to the second power transmission request signal, A contactless charging method, wherein the first power transmission request signal is ignored. A non-contact power supply method for supplying power by transmitting power from a power supply stand without contact to a power receiving device having an electrical load,
A step of transmitting power from the power transmission coil to the power reception coil in a state where the power reception coil of the power reception device is electromagnetically coupled to the power transmission coil of the power supply base;
The power receiving device starts power feeding to the electric load based on the received power received by the power receiving coil, and detects a power receiving side detection current or a power receiving side detection power;
A step of transmitting a power transmission request signal instructing increase / decrease in the amount of transmitted power transmitted from the power supply base to the power receiving device based on the detected power reception side detection current or power reception side detection power;
Adjusting the amount of transmitted power transmitted from the power transmission coil to the power reception coil in accordance with the power transmission request signal;
The power receiving device, as a power transmission request signal,
A first transmission request signal for requesting a first transmission power necessary for power supply in a first current mode for supplying power to an electrical load, with a first current value according to a standardized contactless charging method as a rated current,
The second transmission power required for power supply in the second current mode for supplying power to the electrical load, with the second current value in accordance with the non-standardized contactless charging method larger than the first current value as the rated current, Sending the requested second power transmission request signal to the power supply stand in the order of the second power transmission request signal and the first power transmission request signal,
The power supply stand is
If the power transmission in the second current mode is not supported, the first transmission request signal is received, and the first transmission power is supplied to the power receiving device according to the signal,
In the case of supporting power transmission in the second current mode, the second power transmission request signal and the first power transmission request signal are received, and the second transmitted power is transmitted to the power receiving device according to the second power transmission request signal. The contactless charging method, wherein the first power transmission request signal is ignored. A non-contact power supply method for supplying power by transmitting power from a power supply stand without contact to a power receiving device having an electrical load,
A step of transmitting power from the power transmission coil to the power reception coil in a state where the power reception coil of the power reception device is electromagnetically coupled to the power transmission coil of the power supply base;
The power receiving device starts power feeding to the electric load based on the received power received by the power receiving coil, and detects a power receiving side detection current or a power receiving side detection power;
A step of transmitting a power transmission request signal instructing increase / decrease in the amount of transmitted power transmitted from the power supply base to the power receiving device based on the detected power reception side detection current or power reception side detection power;
Adjusting the amount of transmitted power transmitted from the power transmission coil to the power reception coil in accordance with the power transmission request signal;
The power supply stand is from the power receiving device,
Received a first transmission request signal requesting the first transmission power required for power supply in the first current mode for supplying power to the electrical load, with the first current value according to the standardized contactless charging method as the rated current The first transmission power is transmitted from the power transmission coil,
The second transmission power required for power supply in the second current mode for supplying power to the electrical load, with the second current value in accordance with the non-standardized contactless charging method larger than the first current value as the rated current, When receiving the requested second transmission request signal, the second transmission power is transmitted from the power transmission coil,
When the second power transmission request signal and the first power transmission request signal are received in this order,
According to the second power transmission request signal, the second power transmission power is transmitted by the power control means, while the first power transmission request signal is ignored.

Images