JP2005110409A - Power supply system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a power supply system capable of supplying power to different types of electronic devices with one power transmission device.
A power transmission device having a primary side coil, and a primary side circuit that gives a pulse voltage obtained by switching a DC voltage obtained by rectifying and smoothing a commercial power source to the primary side coil, and a primary side. Power supply comprising a secondary side coil 12 magnetically coupled to the side coil 11 and a mobile phone (power receiving device) 2 having a secondary side circuit 13 for rectifying and smoothing the induced voltage induced in the secondary side coil 12 In the system, as power adjustment means for adjusting transmission power according to the power of the power receiving device, a carrier wave oscillation circuit 37 that oscillates a carrier wave, and a modulated wave obtained by modulating the information signal of the mobile phone 2 in response to the carrier wave is transmitted. A modulation circuit 45 and a power switching circuit 32 that switches transmission power by an information signal obtained by demodulating the modulated wave by the demodulation circuit 36 are provided.
[Selection] Figure 3

Description

  The present invention relates to a power supply system that supplies power to an electronic device, and more particularly to a power supply system that supplies power to a mobile electronic device such as a mobile phone, a notebook computer, a digital camera, or an electronic toy. is there.

  Examples of conventional power supply systems for mobile electronic devices are shown in FIGS. First, FIG. 13 is an external view showing the external appearance of a mobile phone equipped with a conventional power supply system and a terminal contact type charger (AC adapter) of the mobile phone. In FIG. 13, reference numeral 101 denotes a mobile phone, and reference numeral 102 denotes a holder of a terminal contact type dedicated charger (AC adapter) for charging a storage battery built in the mobile phone 101. An AC adapter 102a (integrated with an AC plug) and a cord 102b are attached to the holder 102 of the AC adapter. By inserting the AC plug 102a (integrated with an AC plug) into an outlet provided on a wall surface or the like, commercial power is supplied. (AC100V) is supplied to the AC adapter 102a. Then, the AC adapter 102a converts the supplied AC 100V into a DC voltage used for charging the storage battery of the mobile phone 101, and passes the cord 102b, the AC adapter holder 102, and the power receiving electrode in contact with the power receiving electrode of the mobile phone 101. Then, the storage battery of the mobile phone 101 is charged with this DC voltage. Further, this DC voltage can be directly used as a driving power source for the mobile phone 101.

  Next, FIG. 14 is an external view showing the external appearance of a notebook computer equipped with another conventional power supply system and a dedicated charger (AC adapter) for the notebook computer. In FIG. 14, reference numeral 103 denotes a notebook personal computer, and reference numeral 104 denotes a dedicated charger (AC adapter) for charging a storage battery built in the notebook personal computer 103. An AC plug 104a and cords 104b and 104c are attached to the AC adapter 104, and a commercial power supply (AC 100V) is supplied to the AC adapter 104 through the cord 104b by inserting the AC plug 104a into an outlet provided on a wall surface or the like. Is done. Then, the AC adapter 104 converts the supplied AC 100V into a DC voltage used for charging the storage battery of the notebook computer 103, and supplies the DC voltage to the notebook computer 103 via the cord 104c. Charge. Further, this DC voltage can be directly used as a driving power source for the notebook computer 103.

  Next, FIG. 15 is an external view showing the external appearance of a shaver equipped with another conventional power supply system and a non-contact dedicated charger (AC adapter) of the shaver. In FIG. 15, reference numeral 105 denotes a shaver, and reference numeral 106 denotes a non-contact dedicated charger (AC adapter) for charging a storage battery built in the shaver 105. An AC plug 106 a and a cord 106 b are attached to the AC adapter 106, and commercial power (AC 100 V) is supplied to the AC adapter 106 through the cord 106 b by inserting the AC plug 106 a into an outlet provided on a wall surface or the like. . The AC adapter 106 once converts the supplied AC 100V into a DC voltage, and then switches to supply the DC voltage used for charging to the storage battery of the shaver 105 by a non-contact power supply method using magnetic coupling. Further, this DC voltage can be directly used as a driving power source for the shaver 105.

In addition, the secondary coil is disposed at the bottom of the main body, the primary coil is disposed below the main body mounting portion of the charger, and the main body is placed on the main body mounting portion of the charger. In a non-contact charging apparatus in which a primary coil disposed under a subordinate and a secondary coil disposed at a bottom portion of a main body are magnetically coupled to charge a storage battery in the main body, the main body housing includes a secondary coil. A plurality of housing parts divided by a longitudinal plane are combined, and among the plurality of housing parts, one housing part has a bottom wall continuously formed on the outer peripheral wall thereof, and 2 on the inner surface of the bottom wall. There is a non-contact charging device in which a secondary coil is provided and the outer surface of the bottom wall serves as a contact surface with the main body mounting portion of the charger during charging (see, for example, Patent Document 1).
Japanese Patent Laid-Open No. 2001-16789

  However, as shown in FIGS. 13 to 15, the charging of each electronic device such as the mobile phone 101, the notebook computer 103, and the shaver 105 requires a dedicated AC adapter for each electronic device, and other AC adapters are used. There is a problem that many AC adapters are overflowing in the home because they cannot be used, that is, the AC adapters are not compatible with each other. In addition, it is necessary to carry a dedicated AC adapter for the electronic device in the destination or in a moving public facility, which greatly impairs the portability of the mobile electronic device.

  Moreover, in the prior art described in Patent Document 1, there is no worry that a step is generated between housing parts joined at the bottom of the housing, and the distance between the primary coil and the secondary coil can be kept constant. Therefore, although a stable charging current can be supplied to the electronic device of the main body, the type of electronic device that can be charged by the non-contact charging device is only one type, and a plurality of types of electronic devices can be charged. There was a problem that you can't.

  An object of the present invention is to provide a power supply system that can supply power to different types of electronic devices with a single power transmission device.

  In order to achieve the above object, the present invention provides a power supply system that supplies power to a power receiving device from a power transmission device to which a commercial power source is applied in an electrically non-contact manner, and transmits power according to the power of the power receiving device. Power adjustment means for adjustment is provided. If it does in this way, electric power can be supplied to a different kind of receiving device with one power transmission device.

  In addition, the present invention provides a power transmission device including a primary side coil, and a primary side circuit that supplies a pulse voltage obtained by switching a DC voltage obtained by rectifying and smoothing a commercial power source to the primary side coil, and the primary side In a power supply system comprising: a secondary coil that is magnetically coupled to the side coil; and a secondary device that rectifies and smoothes the induced voltage induced in the secondary coil, the power of the power receiver Power adjusting means for adjusting the transmission power according to the above is provided. If it does in this way, electric power can be supplied to a different kind of receiving device with one power transmission device.

  In addition, for example, the primary coil includes a coil having a plurality of taps having different turns, and the power adjustment unit applies the pulse voltage from the plurality of taps according to the power of the power receiving device. It is preferable to have power switching means for switching the tap to be performed. In this way, the transmitted power from the power transmission device can be switched according to the power of the power receiving device.

  In addition, for example, the primary side coil includes a plurality of coils having different numbers of turns, and the power adjustment unit switches a coil to which the pulse voltage is applied from the plurality of coils according to the power of the power receiving device. It is preferable to have power switching means. In this way, the transmitted power from the power transmission device can be switched according to the power of the power receiving device.

  Also, for example, a carrier wave oscillating means that periodically applies a carrier wave to the primary side coil, and an information signal related to the power receiving device that is modulated and transmitted from the power receiving device in response to the carrier wave is transmitted to the primary side coil. It is preferable that the primary side circuit has demodulation means for receiving and demodulating through the primary side circuit. If it does in this way, the transmitted electric power from the said power transmission apparatus can be adjusted according to the information signal from the said power receiving apparatus.

  In addition, for example, the power adjustment unit may be configured to transmit a carrier wave oscillation unit that periodically applies a carrier wave to the primary coil, and an information signal related to the power receiving device that is modulated and transmitted from the power receiving device in response to the carrier wave. Demodulating means for receiving and demodulating via the primary side coil in the primary side circuit, carrier wave detecting means for detecting the carrier wave transmitted to the secondary side coil, and modulation from the carrier wave A clock extracting means for extracting a necessary clock signal; and when the carrier wave detecting means detects the carrier wave, the information carrier modulates the carrier wave based on the clock signal and transmits it via the secondary coil. It is preferable that the secondary side circuit has a modulation means, and the power switching means is switched based on the information signal demodulated by the demodulation means to adjust the transmission power. In this way, the transmission power from the power transmission device can be adjusted according to the information signal from the power receiving device, and the carrier oscillation circuit and information for transmitting the information signal to the secondary circuit A power supply used for a control circuit or the like for transmitting a signal becomes unnecessary, and the circuit can be simplified.

  Further, for example, when the coil that constitutes the primary side coil and the coil that applies the pulse voltage and the coil that applies the carrier wave and extracts the information signal are the same coil, the primary side circuit Thus, the power transmission device can be reduced in size.

  Further, for example, when the primary side coil is a coil that applies the pulse voltage and the coil that applies the carrier wave and extracts the information signal, the primary side coil It is possible to reduce the withstand voltage of an electronic component or the like used in a circuit information signal processing circuit.

  For example, when the power adjustment unit has a function of recognizing information on the power receiving device based on an information signal demodulated by the demodulation unit, the power transmission device recognizes information on the power receiving device. The transmitted power can be adjusted according to the information of the power receiving device.

  For example, the information signal may include a “code indicating that the device is a power receiving device”. In this way, the power transmission device can recognize that a device capable of receiving power is placed on the power transmission device.

  Further, for example, based on a “code indicating that the device is a power receiving device” included in the information signal, power may be transmitted when a device capable of receiving power is placed on the power transmission device. If it does in this way, when a metal etc. are mounted on the said power transmission apparatus, heat transmission of the said metal etc. can be prevented by not performing power transmission, and it is safe.

  In addition, for example, having a power transmission availability determination unit that determines whether a device capable of receiving power is placed on the power transmission device based on a “code indicating that the device is a power receiving device” included in the information signal. good. In this way, the power transmission device can recognize that a device capable of receiving power is placed on the power transmission device.

  In addition, for example, the power transmission permission / inhibition determining unit may be configured to receive a power when the “code indicating power receiving device” included in the information signal is a predetermined “code indicating power receiving device”. Is switched on the power switching means so that the pulse voltage is applied to the primary coil, and the information signal includes “indicating that it is a power receiving device”. When the “code” is not a predetermined “code indicating that the device is a power receiving device”, it is determined that a device capable of receiving power is not placed on the power transmission device, and the pulse voltage is applied to the primary coil. The power switching means may be switched so as not to occur. In this way, the power transmission device can transmit power only when a power receiving device having an information signal of “code indicating power receiving device” is placed on the power transmission device, When a metal or the like is placed on the power transmission device, it is safe because heat generation of the metal or the like can be prevented by not performing power transmission.

  Further, for example, the information signal may include “power consumption information”, and may include power amount determination means for determining a transmission power amount based on “power consumption information” included in the information signal. In this way, the power transmission device can recognize the power consumption of the power receiving device.

  For example, when the power amount determination unit switches the power switching unit according to the determined transmission power amount, the power amount determination unit may switch the transmission power from the power transmission device to the power according to the power consumption of the power receiving device. In addition, power can be supplied to power receiving devices with different power consumption by one power transmission device.

  In addition, for example, when the power receiving device is a power receiving device that charges a storage battery with the power transmitted from the power transmission device, the information signal may include “full charge information”. In this way, the power transmission device can recognize that the power receiving device is fully charged.

  Further, for example, based on “full charge information” included in the information signal, power transmission may be stopped when the power receiving device is fully charged. In this way, unnecessary power is not transmitted, and energy saving can be achieved.

  In addition, for example, a full charge determination unit that determines whether or not the power receiving device is fully charged based on “full charge information” included in the information signal may be provided. In this way, the power transmission device can recognize that the power receiving device is fully charged.

  In addition, for example, the full charge determination unit may determine that the power receiving device is not fully charged when the “full charge information” included in the information signal does not indicate that the power receiving device is fully charged. The power switching means is switched so as to apply the pulse voltage to the primary coil, and “full charge information” included in the information signal indicates that the power receiving device is fully charged. In this case, it is preferable to determine that the power receiving device is fully charged and to switch the power switching unit so that the pulse voltage is not applied to the primary coil. In this way, the power transmission device does not transmit power when the power receiving device is fully charged, so energy saving can be achieved.

  Further, for example, when the relative position between the power transmission device and the power receiving device is changed, the transmission efficiency of the transmission power and the transmission efficiency of the information signal are changed at a substantially equal ratio, and the power adjustment means Based on the transmission efficiency of the information signal received by the demodulation means, the power transmission apparatus includes the power transmission availability determination means for determining whether the relative position between the power transmission apparatus and the power receiving device is a position suitable for power transmission. It is possible to recognize whether or not the relative position between the power transmission device and the power receiving device is a position suitable for power transmission.

  Further, for example, when the transmission efficiency of the information signal received by the information signal receiving unit is greater than a predetermined value, the power transmission availability determination unit is configured such that the relative position between the power transmission device and the power receiving device is suitable for power transmission. When the power switching means is switched so that the pulse voltage is applied to the primary coil, and the transmission efficiency of the information signal received by the information signal receiving means is smaller than a predetermined value, It is preferable to determine that the relative position between the power transmission device and the power receiving device is not a position suitable for power transmission, and to switch the power switching unit so that the pulse voltage is not applied to the primary coil. If it does in this way, when the relative position of the power transmission apparatus and the power receiving device is not a position suitable for power transmission, power transmission is not performed, and thus energy saving can be achieved.

  Further, for example, the power adjustment unit may have a function of recognizing information on the power receiving device based on a change in current and / or voltage detected by the current / voltage detection unit. If it does in this way, the transmitted electric power from the said power transmission apparatus can be adjusted according to the electric power of the said receiving device.

  Further, for example, when a device capable of receiving power is placed on the power transmission device from a change in current and / or voltage detected by the current / voltage detection means, a metal is placed on the power transmission device. When such as is placed, it is safe to prevent the heat generation of the metal or the like by not transmitting power.

  Further, for example, the primary side circuit has current / voltage detection means for detecting a change in current and / or voltage flowing in the primary side coil, and the current and / or voltage detected by the current / voltage detection means. It is preferable to adjust the transmission power by switching the power switching means based on the change of the power. If it does in this way, the transmitted electric power from the said power transmission apparatus can be adjusted according to the electric power of the said receiving device.

  Further, for example, when the power adjustment unit has a function of recognizing information on the power receiving device based on a change in current and / or voltage detected by the current / voltage detection unit, the power transmission device is configured to receive the power receiving device. By recognizing the information, the transmitted power can be adjusted according to the information of the power receiving device.

  In addition, for example, it has power transmission availability determination means for determining whether a device capable of receiving power is placed on the power transmission device based on a change in current and / or voltage detected by the current / voltage detection means. It is possible to recognize whether or not a device that can receive power is placed on the power transmission device.

  In addition, for example, when the current / voltage detection unit detects a change in current and / or voltage, the power transmission availability determination unit has a device capable of receiving power placed on the power transmission device. When the power switching means is switched so that the pulse voltage is applied to the primary side coil and the current and / or voltage detected by the current / voltage detection means is hardly changed, It is preferable to switch the power switching means so that it is determined that a device capable of receiving power is not placed on the power transmission device and the pulse voltage is not applied to the primary coil. In this case, the power transmission device can transmit power only when a device capable of receiving power is placed on the power transmission device, and when metal or the like is placed on the power transmission device. By not transmitting power, the heat generation of the metal or the like can be prevented and it is safe.

  In addition, for example, when the power transmission device includes a power amount determination unit that determines a transmission power amount based on a change in current and / or voltage detected by the current / voltage detection unit, the power transmission device can reduce power consumption of the power receiving device. Can be recognized.

  For example, when the power amount determination unit switches the power switching unit according to the determined transmission power amount, the power amount determination unit may switch the transmission power from the power transmission device to the power according to the power consumption of the power receiving device. In addition, power can be supplied to power receiving devices with different power consumption by one power transmission device.

  In addition, for example, when the power receiving device is a power receiving device that charges a storage battery with the power transmitted from the power transmission device, the power receiving device is based on a change in current and / or voltage detected by the current / voltage detection unit. If power transmission is stopped when the device is fully charged, unnecessary power is not transmitted, and energy saving can be achieved.

  In addition, for example, when the power receiving device is a power receiving device that charges a storage battery with the power transmitted from the power transmission device, the power receiving device is based on a change in current and / or voltage detected by the current / voltage detection unit. When having a full charge determination means for determining whether or not the device is fully charged, the power transmission device can recognize that the power receiving device is fully charged.

  In addition, for example, the full charge determining unit determines that the power receiving device is not fully charged when the current and / or voltage detected by the current / voltage detecting unit is changed, and determines the pulse voltage. When the power switching means is switched so as to be applied to the primary side coil, and the current and / or voltage detected by the current / voltage detection means hardly changes, the power receiving device is fully charged. It is preferable to switch the power switching means so that the pulse voltage is not applied to the primary coil. In this way, the power transmission device does not transmit power when the power receiving device is fully charged, so energy saving can be achieved.

  Further, for example, when power is supplied from the power transmission device to the power receiving device, a convex portion is provided on one of the opposing surfaces of the power transmission device and the power receiving device, a concave portion is provided on the other side, and the convex portion and the concave portion are fitted. By combining the power transmission device and the power receiving device, the relative position between the power transmission device and the power receiving device can be easily aligned to a position suitable for power transmission.

  In addition, for example, when power is supplied from the power transmission device to the power receiving device, a mark indicating a region where power can be supplied is provided on each of the opposing surfaces of the power transmission device and the power receiving device. If the apparatus and the power receiving device can be aligned, it is easy to align the relative position between the power transmission device and the power receiving device at a position suitable for power transmission.

  In addition, for example, when a display unit that indicates the amount of power transmitted by the power transmission device is provided in the power transmission device, a user can easily understand the operation status of the power transmission device visually.

  In addition, for example, when the power receiving device is a power receiving device that charges a storage battery with the power transmitted from the power transmitting device, the display device indicating that the power receiving device is fully charged is provided in the power transmitting device. The person can easily understand visually that the charging of the power receiving device is completed.

  Further, for example, after power transmission from the power transmission device to the charging device is started, if the power transmission device is provided with a display unit indicating that the power reception device is removed from the power transmission device, the user It can be easily understood visually that the reason why the power transmission of the power transmission device is stopped is that the power receiving device has been removed from above the power transmission device.

  In addition, for example, when the relative position between the power transmission device and the power receiving device is not a position suitable for power transmission, the display unit indicating that the relative position between the power transmission device and the power reception device is not a position suitable for power transmission. When provided in a power transmission device, it is easy to visually understand that the reason why the power transmission of the power transmission device is stopped is that the relative position between the power transmission device and the power receiving device is not a position suitable for power transmission. it can.

  Further, for example, when the power receiving device is a power receiving device that receives power from a pair of contact-type power receiving electrodes, a pair of power transmitting electrodes that supply power by contacting the pair of power receiving electrodes; A current detection means for detecting a current flowing between the pair of power transmission electrodes when the contact-type pair of power reception electrodes of the power reception device are in contact with the pair of power transmission electrodes; A power path switching unit that switches between a path for supplying transmission power to the pair of power transmission electrodes and a path for supplying transmission power to the primary coil according to the detection result may be provided in the power transmission apparatus. In this case, even when a power receiving device that receives power supply from a pair of contact-type power receiving electrodes is placed on the power transmitting device, power can be supplied to the power receiving device.

  According to the present invention, a power transmission device including a primary side coil and a primary side circuit that supplies a pulse voltage obtained by switching a DC voltage obtained by rectifying and smoothing a commercial power source to the primary side coil, and the primary In a power supply system comprising: a secondary coil that is magnetically coupled to the side coil; and a secondary device that rectifies and smoothes the induced voltage induced in the secondary coil, the power of the power receiver Since the power adjustment means for adjusting the transmission power according to the above is provided, it is possible to realize a power supply system that can supply power to different types of power receiving devices with one power transmission device.

  Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is an external view showing an external appearance of a power transmission device and a power receiving device equipped with the power supply system of the first embodiment of the present invention. In FIG. 1, reference numeral 1 denotes a power transmission device that supplies electric power, (a) shows a case where the power receiving device is a mobile phone 2, and (b) shows a case where the power receiving device is a notebook computer 3. The power transmission device 1 includes an AC plug 1a and a cord 1b. When the AC plug 1a is inserted into an outlet provided on a wall surface or the like, commercial power (AC100V) is supplied to the power transmission device 1 through the cord 1b. The power transmission device 1 once converts the supplied AC 100V into a DC voltage, and then switches to charge the storage battery of the mobile phone 2 or the notebook personal computer 3 as a power receiving device by a non-contact power supply method using magnetic coupling. Supply the DC voltage to be used. Further, this DC voltage can be directly used as a driving power source for the mobile phone 2 or the notebook computer 3.

  Further, the power transmission device 1 has a function of recognizing a power receiving device placed on the power transmission device 1 and transmitting power necessary for the power receiving device according to the power receiving device. The device 1 can charge even an electronic device such as a mobile phone 2 or a notebook personal computer 3 that has different power required for charging. Further, although not shown, any electronic device having a storage battery such as a digital camera, a video camera, or a PDA can be charged in the same manner. The power transmission device 1 also includes light emitting diodes (display means) LED1 and LED2 (hereinafter simply referred to as LED1 and LED2) that indicate an AC100V input state, a power supply state to a power receiving device, and the like. The functions and operations of the LEDs 1 and 2 will be described later.

  Next, the principle of the non-contact transmission method will be described with reference to FIG. FIG. 2 is a diagram for explaining a schematic configuration inside the power transmission device 1 and the mobile phone 2 shown in FIG. 1, (a) shows the entire power transmission device 1 and the mobile phone 2, and (b) shows a coil. The part is shown enlarged. In FIG. 2, the same parts as those in FIG. As illustrated in FIG. 2A, the power transmission device 1 includes a primary side circuit 10 and a primary side coil 11, and the mobile phone 2 includes a secondary side coil 12, a secondary side circuit 13, and a charge control circuit 14. It has.

  The primary side circuit 10 performs full-wave rectification and smoothing of the AC 100V supplied via the AC plug 1a and the cord 1b to make a DC voltage once, and then turns the pulse voltage obtained by switching the DC voltage to the primary side coil 11. To give. As shown in FIG. 2B, the primary side coil 11 and the secondary side coil 12 form a transformer in which the primary side core (ferrite) 15 and the secondary side core (ferrite) 16 are magnetically coupled. When a switched pulse voltage is applied to the primary side coil 11, a voltage corresponding to the turn ratio between the primary side coil 11 and the secondary side coil 12 is applied to the secondary side coil 12 by magnetic coupling. Induced. Then, the induced voltage is rectified and smoothed by the secondary side circuit 13 and applied to the charge control circuit 14, and the charge control circuit 14 charges the storage battery with the supplied DC voltage. In this way, non-contact power supply from the power transmission device 1 to the mobile phone 2 is performed.

  Moreover, between the primary side circuit 10 and the secondary side circuit 13, signals, such as information regarding power supply, are transmitted by the above-described contactless transmission method. This signal transmission is performed for the following purposes. First, when power is transmitted with a metal or the like placed on the power transmission device 1, there is a problem that the metal generates heat due to an eddy current, so that a device capable of receiving power is placed. is there. Second, in order to transmit necessary power according to the power receiving device, it is necessary for the power transmission device 1 side to switch between the coil and the circuit, so that the power transmission device 1 side recognizes the power amount information of the power receiving device. . Third, since it is necessary to stop power transmission when the power receiving device is fully charged (for energy saving), the power transmission device 1 recognizes whether or not the power receiving device is fully charged.

  FIG. 3 is a block diagram illustrating an electrical configuration of the power transmission device and the mobile phone illustrated in FIGS. 1 and 2. 3, the same parts as those in FIGS. 1 and 2 are denoted by the same reference numerals, and the description thereof is omitted. In FIG. 3, commercial power (AC100V) is supplied from the AC plug 1a through the cord 1b from the outside, and the supplied AC100V is full-wave rectified by the rectifier circuit 21 in the primary side circuit 10, and then the coil L1 And smoothed by a smoothing circuit comprising a capacitor C1 and converted to a DC voltage. A pulse voltage obtained by switching the DC voltage by the switching circuit 22 is applied to the primary coil 11 via the transistors (power switching means) TR11, TR12, TR13.

  The transistors TR11, TR12, and TR13 are all NPN type transistors, and the collectors are all connected to the output terminal of the switching circuit 22. The emitter of the transistor TR11 is connected to one end of the primary side coil 11, and the other end of the primary side coil 11 is connected to the ground. Further, the primary coil 11 has taps a, b, and c in order from the far end from the coil end connected to the ground, that is, in order from the one with the larger number of turns, and the emitter of the transistor TR12 is connected to the tap a. The emitter of the transistor TR13 is connected to the tap b. The tap c is connected to a demodulation circuit (demodulation means) 36 and a carrier wave oscillation circuit (carrier wave oscillation means) 37 of a power transmission control IC (power adjustment means) 24 that performs power transmission control of the primary side circuit 10. The bases of the transistors TR11, TR12, TR13 are connected to a power switching circuit (power switching means) 32 of the power transmission control IC 24, respectively. The power transmission control IC 24 includes an LED display circuit 31, a power switching circuit 32, a power transmission availability determination circuit (power transmission availability determination means) 33, a power amount determination circuit (power amount determination means) 34, and a full charge determination circuit (full charge determination means). 35, an IC composed of a demodulation circuit 36 and a carrier wave oscillation circuit 37. The IC chip is formed to reduce the size and thickness of the power transmission device 1. The function and operation of each circuit will be described later. Note that the transistors TR11, TR12, and TR13 may be other switching elements such as MOSFETs, or selector switches.

  The pulse voltage switched by the switching circuit 22 is also applied to the transformer 23, converted into a predetermined voltage by the transformer 23, rectified by the rectifier circuit 25, and smoothed by the smoothing circuit including the coil L2 and the capacitor C2. And converted to a DC voltage. This DC voltage is supplied to each control circuit and the like of the primary side circuit 10 as a power source Vcc for controlling the primary side circuit 10.

  Further, the collectors of NPN transistors TR1 and TR2 are connected to the power source Vcc, the emitter of the transistor TR1 is connected to the anode of the LED1 via the current limiting resistor R1, and the cathode of the LED1 is connected to the ground. On the other hand, the emitter of the transistor TR2 is connected to the anode of the LED 2 via the current limiting resistor R2, and the cathode of the LED 2 is connected to the ground. The bases of the transistors TR1 and TR2 are connected to the LED display circuit (display means) 31 of the power transmission control IC 24. With such a configuration, when the LED display circuit 31 turns on the transistor TR1, the LED1 emits light, and when the transistor TR2 is turned on, the LED2 emits light. However, the LED 1 has a function of emitting red, yellow, green, purple and orange according to a signal from the LED display circuit 31 by a lighting control circuit (not shown), and the LED 2 similarly emits red and green. It has a function to do. The transistors TR1 and TR2 may be other switching elements such as MOSFETs.

  Next, the mobile phone 2 side will be described. A smoothing capacitor C4 and a rectifier circuit 41 are connected to both ends of the secondary coil 12, and the induced voltage induced in the secondary coil 12 is full-wave rectified by the rectifier circuit 41, and then the coil L3 and the capacitor It is smoothed by a smoothing circuit comprising C3 and converted to a DC voltage. The DC voltage is applied to a power-on reset circuit (carrier wave detection means) 44, a voltage clamp circuit 46, and a regulator 47 of a power reception control IC (power adjustment means) 42 that performs power reception control of the secondary side circuit 13.

  The power-on reset circuit 44 determines that there is a request for an information signal from the power transmission device 1 by detecting a DC voltage converted from a carrier wave transmitted from the primary side circuit 10 described later, and resets the power reception control IC 42. This is a circuit for starting transmission of an information signal. The voltage clamp circuit 46 is a circuit for clamping the converted DC voltage to a predetermined voltage to prevent voltage breakdown of each circuit, and the regulator 47 charges the converted DC voltage. It is a circuit for converting to a predetermined voltage to be used and supplying it to the charging control circuit 14. The power reception control IC 42 further includes a clock extraction circuit (clock extraction means) 43 and a modulation circuit (modulation means) 45 connected to the secondary side coil 12, and includes the primary side coil 11 and the secondary side coil. 12 performs signal processing of the signal transmitted through the terminal 12. The power reception control IC 42 is formed as an IC chip for reducing the size and thickness of the mobile phone 2.

  Next, the power supply operation of the power transmission device 1 and the mobile phone 2 having such a configuration will be described with reference to FIG. FIG. 4 is a flowchart showing the power supply operation of the power transmission device 1. The power transmission device 1 starts operation when AC 100 V is supplied. First, when AC 100 V is input, the power supply Vcc for control is supplied to the power transmission control IC 24, so that the LED display circuit 31 turns on the LED 1 in red and turns off the LED 2 (step S1). Then, the carrier wave oscillation circuit 37 outputs a predetermined carrier wave at regular intervals (step S2), and determines whether or not the power receiving device is placed on the power transmission device 1 (step S3). A method for determining whether or not this power receiving device is placed will be described below.

  The carrier wave output from the carrier wave oscillation circuit 37 is given to the tap c of the primary side coil 11, and when the mobile phone 2 is placed on the power transmission device 1, the magnetically coupled secondary side coil 12 is applied. Is transmitted. The carrier wave transmitted to the secondary coil 12 is rectified and smoothed by the rectifier circuit 41, the coil L3, and the capacitor C3 and converted to a DC voltage. The DC voltage obtained by converting the carrier wave is detected by the power-on reset circuit 44 to recognize that the carrier wave has been transmitted. Then, the clock extraction circuit 43 connected to the secondary coil 12 extracts a clock signal necessary for modulation from the carrier wave, and the modulation circuit 45 indicates that “it is a power receiving device” that is information of the mobile phone 2. A modulated wave obtained by modulating a carrier wave based on the “code shown”, “power consumption information”, and “full charge information” is given to the secondary coil 12. As a modulation method at this time, a phase modulation method is used in which the carrier wave is intensity-modulated periodically and 0/1 information is expressed by the phase change information of the signal. In this way, since the clock signal necessary for modulation is extracted from the carrier wave transmitted from the power transmission device 1, it is not necessary to have a transmission circuit in the mobile phone 2 which is a power receiving device, and further, the clock extraction circuit 43, the modulation circuit Since the driving power of 45 uses the power supplied by the carrier wave, no power source is required in the mobile phone 2 which is a power receiving device, and the circuit can be simplified.

  The modulated wave supplied from the modulation circuit 45 to the secondary coil 12 is transmitted to the primary coil 11 that is magnetically coupled. The demodulating circuit 36 connected to the tap c of the primary coil 11 receives and demodulates the transmitted modulated wave, and includes a “code indicating a power receiving device” included in the demodulated information signal, The “power consumption information” and “full charge information” are supplied to the power transmission availability determination circuit 33, the electric energy determination circuit 34, and the full charge determination circuit 35. Here, the power transmission availability determination circuit 33 determines whether or not the power receiving device is placed on the power transmission device 1 based on the “code indicating that the device is a power receiving device” (step S3). If the predetermined “code indicating that the device is a power receiving device” is received, it is recognized that the power receiving device is placed on the power transmission device 1, and then the power receiving device is correctly placed on the power transmission device 1. It is determined whether or not it is placed (step S4). On the other hand, if the predetermined “code indicating that the device is a power receiving device” has not been received, it is determined that the power receiving device is not placed on the power transmission device 1, and the carrier wave is output again (step S2).

  Next, it is a determination of whether or not the power receiving device is correctly placed on the power transmission device 1, but the meaning that the power receiving device is correctly placed on the power transmission device 1 means that in non-contact power supply, Whether the coil on the power transmission side and the coil on the power reception side are arranged at positions where power transmission efficiency is high, in other words, the primary side core 15 of the power transmission device 1 shown in FIG. This means whether or not the power transmission device 1 and the mobile phone 2 are arranged at a position where the magnetic coupling of the secondary side core 16 of No. 2 has a high degree of coupling.

  FIG. 11 is a diagram showing the relationship between the relative position between the power transmission device 1 and the mobile phone 2 and the transmission efficiency of power and information signals. Here, the information signal is the above-described modulated wave returned from the secondary side circuit 13 with respect to the carrier wave transmitted from the primary side circuit 10. In FIG. 11, (a) shows the absolute value of the transmission efficiency of power (solid line) and information signal (dashed line), and (b) shows the relative value of the transmission efficiency of power (solid line) and information signal (dashed line). In both (a) and (b), the horizontal axis indicates the amount of displacement between the power transmission device 1 and the mobile phone 2 that is the power receiving device, and the primary side core 15 of the power transmission device 1 and the secondary of the mobile phone 2. The case where the power transmission device 1 and the mobile phone 2 are located at the position where the magnetic coupling of the side core 16 is the highest is 0, and the mobile phone 2 is shifted in the left-right direction or the front-rear direction from that position. The quantity is shown in mm.

  As shown in FIG. 11A, as the amount of positional deviation between the power transmission device 1 and the mobile phone 2 increases, both the power transmission efficiency and the information signal transmission efficiency become worse. The power transmission efficiency and the information signal transmission efficiency decrease at the same rate with respect to the positional deviation between the power transmission device 1 and the mobile phone 2 as shown in FIG. Even when the power is not transmitted, the amount of positional deviation between the power transmission device 1 and the mobile phone 2 can be recognized by measuring the signal strength of the information signal.

  And as the amount of positional deviation between the power transmission device 1 and the mobile phone 2 increases, the power transmission efficiency deteriorates. Therefore, if the power transmission efficiency is extremely low, the mobile phone 2 can be transmitted even if power is transmitted from the power transmission device 1. This means that it is impossible to receive power, and there is no point in performing power transmission. Therefore, it is determined whether or not the amount of positional deviation between the power transmitting device 1 and the mobile phone 2 exceeds a predetermined amount of deviation (step S4). Power transmission from the power transmission device 1 is not performed, and the LED 1 is turned on in orange as a warning display, and the LED 2 is turned off (step S5). At this time, a warning sound may be generated.

  On the other hand, when the amount of position shift between the power transmission device 1 and the mobile phone 2 does not exceed the predetermined amount of shift, the process proceeds to processing for determining the amount of power to be transmitted (step S6). This determination processing is performed by the power amount determination circuit 34 based on the “power consumption information” included in the information signal demodulated by the demodulation circuit 36, and the power of the mobile phone 2 is determined based on the “power consumption information”. And the power transmission output is adjusted to three levels of large, medium and small according to the electric power. The determination result from the power amount determination circuit 34 is transmitted to the LED display circuit 31 and the power switching circuit 32, and the following processing is performed according to the large, medium, and small determination results.

  First, when the determination result is small, the LED display circuit 31 turns on the LED 1 in yellow and blinks the LED 2 in red in the sense that low power transmission is performed (step S7). The power switching circuit 32 turns on the transistor TR11. When the transistor TR11 is turned on, the pulse voltage from the switching circuit 22 is applied to the entire winding of the primary side coil 11, and power transmission is started (step S8). Next, when the determination result is “medium”, the LED display circuit 31 turns on the LED 1 in green and blinks the LED 2 in red in the sense that medium power transmission is performed (step S9). The power switching circuit 32 turns on the transistor TR12. When the transistor TR12 is turned on, the pulse voltage from the switching circuit 22 is applied to the tap a of the primary side coil 11, and power transmission is started (step S10). On the other hand, if the determination result is large, the LED display circuit 31 turns on the LED 1 in purple and blinks the LED 2 in red in the sense that high power transmission is performed (step S11). The power switching circuit 32 turns on the transistor TR13. When the transistor TR13 is turned on, the pulse voltage from the switching circuit 22 is applied to the tap b of the primary coil 11 and power transmission is started (step S12).

  By switching the transistors TR11, TR12, and TR13, the position to which the pulse voltage from the switching circuit is applied changes on the winding of the primary coil 11. That is, since the number of turns of the primary side coil that is actually effective changes, the turn ratio of the primary side coil 11: secondary side coil 12 changes. In this way, it is possible to transmit power according to the power of the power receiving device. In the present embodiment, switching is performed in three stages of large, medium, and small, but the number of switching may be further increased.

  Even after power transmission is started, a carrier wave is periodically transmitted (step S13). Based on information included in a modulated wave returned to the carrier wave, first, the mobile phone 2 that is a power receiving device is connected to the power transmission device. It is confirmed whether or not it has been removed from above 1 (step S14). In this confirmation, as in step S3, the power transmission availability determination circuit 33 determines whether or not the power receiving device is placed on the power transmission device 1 based on “a code indicating that the device is a power receiving device”. If the predetermined “code indicating that the device is a power receiving device” has not been received, it is determined that the power receiving device has been removed from the power transmission device 1, and the power switching circuit 32 turns on all of the transistors TR11, TR12, and TR13. The power output is stopped by turning off (step S15).

  On the other hand, if a predetermined “code indicating that the device is a power receiving device” is received, it is recognized that the power receiving device is placed on the power transmission device 1, and then the power receiving device is installed on the power transmission device 1. It is determined whether or not it is correctly placed (step S16). Similar to step S4, this determination is made by determining whether or not the amount of positional deviation between the power transmission device 1 and the mobile phone 2 exceeds a predetermined amount of deviation. If this deviation amount exceeds a predetermined deviation amount, power transmission from the power transmission device 1 is not performed, and as in step S5, LED1 is lit in orange as a warning display, and LED2 is extinguished ( Step S17). At this time, a warning sound may be generated.

  On the other hand, when the amount of positional deviation between the power transmission device 1 and the mobile phone 2 does not exceed the predetermined amount of deviation, the process proceeds to a process for determining whether or not the mobile phone 2 is fully charged (step S18). ). This determination process is performed by the full charge determination circuit 35 determining whether or not the mobile phone 2 is fully charged based on “full charge information” included in the information signal demodulated by the demodulation circuit 36. . When the battery is fully charged, the power switching circuit 32 turns off all of the transistors TR11, TR12, and TR13 to stop power output (step S19), and the power receiving device stops power transmission because the battery is fully charged. LED 1 is lit in red and LED 2 is lit in green (step S20), the carrier wave is output and the confirmation of the state of the power receiving device is continued (step S13). On the other hand, if it is not fully charged, confirmation of the state of the power receiving device is continued while performing power transmission (step S13). As described above, non-contact power supply from the power transmission device 1 to the mobile phone 2 is performed.

  Further, the operation state of the power transmission device 1 (presence / absence of transmitted power, amount of transmitted power, full charge, etc.) is displayed based on the LED display color and lighting state (off, on, flashing). Although described, the display operation of LED1 and LED2 will be described below with reference to FIG. FIG. 12 is a diagram illustrating display states of the LED 1 and the LED 2 for each operation state of the power transmission device 1. First, when the AC plug 1a is not connected to a commercial power supply (AC 100V), it is assumed that LED1: is off and LED2: is off. When the AC plug 1a is connected to AC100V, LED1: red light is turned on and LED2 is turned off. Further, based on the information of the power receiving device, depending on which amount of power is transmitted, large power, LED1: purple lighting, LED2: red flashing, medium power LED1: green lighting, LED2: Red flashing, small power LED1: yellow lighting, LED2: red flashing. Whether the power receiving device is being charged or fully charged indicates that the LED 2 is being charged with red blinking and is fully lit with green lighting. Then, when a power receiving device is placed on the power transmission device 1 and there is a certain positional deviation, it is possible to emit LED 1: orange and emit a warning sound. As a result, the user can visually determine the operating state of the power supply device. Note that the above-described combinations of LED installation location, color, lighting, blinking, and extinguishing are merely examples, and the present invention is not limited thereto.

  FIG. 5 is a block diagram showing an electrical configuration of a power transmission device and a mobile phone equipped with the power supply system of the second embodiment of the present invention. In FIG. 5, the same parts as those in FIG. 3 are denoted by the same reference numerals, and the description thereof is omitted. The power supply system shown in FIG. 5 is different from the power supply system shown in FIG. 3 in that primary coils 11x, 11y, and 11z are provided instead of the primary coil 11 of the power transmission device 1. . These three coils are the primary side coils 11x, 11y, and 11z in the descending order of the number of turns, and one end of each of them is connected to the ground. The other end of the primary side coil 11x is connected to the emitter of the transistor TR11, the other end of the primary side coil 11y is connected to the emitter of the transistor TR12, and the other end of the primary side coil 11z is connected to the emitter of the transistor TR13. It is connected. In addition, in each coil, tap d (primary coil 11x), tap e (primary coil 11y), tap f (primary coil 11z) are located at the same number of turns from the coil end connected to the ground. The taps d, e, and f are all connected to the demodulation circuit 36 and the carrier wave oscillation circuit 37. In FIG. 5, the primary side coils 11x, 11y, and 11z are drawn apart from each other. However, since they are actually very close to each other, the secondary side coil 12 is brought close to all three coils. It is possible to put it.

  As described above, even when the power transmission device 1 includes three coils for power transmission and individual transistors, the power transmission device 1 uses one primary coil 11 as in the power transmission device 1 illustrated in FIG. In the same manner as in the case of performing, based on the power consumption signal received from the mobile phone 2, the power switching circuit 32 selects a transistor to be turned on according to the amount of transmitted power, thereby selecting a coil to be used for power transmission. Thus, it is possible to transmit power corresponding to the power receiving device. For example, a coil with a large number of turns is used when the power of the power receiving device is small, and a coil with a small number of turns is used when the power is large.

  In the embodiment shown in FIGS. 3 and 5, the transmission of the information signal between the power transmission device 1 and the mobile phone 2 is performed using the same coil as the power supply coil. As shown in FIG. 6, the power supply coil and the signal transmission coil can be separated. FIG. 6 is a block diagram illustrating an electrical configuration of a power transmission device and a mobile phone in which the power supply system according to the third embodiment of the present invention is mounted. In FIG. 6, the same parts as those in FIG. The power supply system shown in FIG. 6 is different from the power supply system shown in FIG. 3 in that primary coils 11a and 11b are provided instead of the primary coil 11 of the power transmission device 1, and the secondary of the mobile phone 2 is provided. The secondary coil 12a, 12b is provided instead of the side coil 12.

  In the power transmission device 1 shown in FIG. 3, the demodulation circuit 36 and the carrier wave oscillation circuit 37 connected to the tap c of the primary side coil 11 are connected to one end of the primary side coil 11 b in the power transmission device 1 shown in FIG. 6. The other end of the primary coil 11b is connected to the ground. Therefore, the primary side coil 11a is a coil dedicated to power transmission, and the primary side coil 11b is a coil dedicated to signal transmission. Further, instead of the secondary side coil 12 of the mobile phone 2 shown in FIG. 3, the secondary side coils 12a and 12b are connected in parallel, and the secondary side coil 12a becomes a coil dedicated to power reception, and the secondary side coil 12b. Is a coil dedicated to signal transmission. As described above, even if the power transmission coil and the signal transmission coil are separated, one primary coil 11 and one secondary coil 12 are used as in the power transmission device 1 shown in FIG. As in the case of transmitting power and signals, it is possible to transmit power corresponding to the power receiving device. Further, when the signal transmission coil and the power coil are electrically separated as in the primary side coils 11a and 11b, the withstand voltage of the electronic components used in the control circuit such as the demodulation circuit 36 to which the signal is transmitted is reduced. Can be lowered.

  FIG. 7 is a block diagram showing an electrical configuration of a power transmission device and a mobile phone equipped with the power supply system of the fourth embodiment of the present invention. In FIG. 7, the same parts as those in FIG. 3 are denoted by the same reference numerals, and the description thereof is omitted. The power supply system shown in FIG. 7 is different from the power supply system shown in FIG. 3 in that the carrier wave transmission circuit 37 of the primary circuit 10 of the power transmission device 1 is removed, and the primary circuit is replaced with the primary circuit 10 instead of the demodulation circuit 36. A current / voltage detection circuit (current / voltage detection means) 38 for detecting a change in current and / or voltage flowing through the side coil 11 and a clock extraction circuit 43 of the secondary side circuit 13 of the mobile phone 2. The power-on reset circuit 44 and the modulation circuit 45 are omitted.

  As described above, when power is supplied from the power transmission device 1 to the mobile phone 2, the following three pieces of information need to be recognized. The first is recognition that a device capable of receiving power is placed, the second is recognition of power amount information of the power receiving device, and the third is recognition of whether or not the power receiving device is fully charged. First, as the first recognition, the current and / or voltage flowing through the primary coil 11 varies depending on whether or not the device placed on the power transmission device 1 can receive power. Alternatively, it is possible to recognize the presence or absence of a device that can receive power from a change in voltage.

  For example, when the power transmission device 1 turns on any of the transistors TR11, TR12, and TR13 and performs power transmission, when a non-receivable device such as metal is placed on the power transmission device 1, the current / voltage detection circuit 38 The current and / or voltage flowing through the primary coil 11 detected by the above change, but the method of change differs from the case where a device capable of receiving power is placed. A change pattern is measured in advance, and the power transmission availability determination circuit 33 determines whether the placed pattern is a metal or a device capable of receiving power by collating with the pattern. When the power transmission possibility determination circuit 33 determines that a device that can receive power is not placed, the power switching circuit 32 is switched, and the transistors TR11, TR12, and TR13 are all turned off to stop power transmission. As a result, metal or the like does not generate heat and is safe.

  On the other hand, when a device capable of receiving power, for example, the mobile phone 2 is placed, the mobile phone 2 has an appropriate impedance, so that the current flowing through the primary coil 11 detected by the current / voltage detection circuit 38 and / or Or there is a change in voltage. A change pattern is measured in advance, and the power transmission availability determination circuit 33 determines whether the placed device is a power receiving device by collating the pattern. When the power transmission availability determination circuit 33 determines that a device capable of receiving power is placed, the power switching circuit 32 is switched, and any of the transistors TR11, TR12, and TR13 can be turned on to transmit power.

  Next, as a second recognition, since the number of turns of the coil used in the power receiving device differs depending on the power of the power receiving device, the current flowing in the primary coil 11 due to the power difference of the placed power receiving device. And / or the voltage varies. Thereby, it is possible to recognize the power amount information of the power receiving device placed on the power transmission device 1. For example, when any of the transistors TR11, TR12, and TR13 is turned on and power transmission is started, a change in current and / or voltage flowing through the primary coil 11 detected by the current / voltage detection circuit 38 is large / If medium / small, the power amount determination circuit 34 determines the power of the mobile phone 2 as high power / medium power / low power, and switches the power switching circuit 32 to high output / medium output / low output. In this way, the power of the mobile phone 2 can be recognized and the amount of power to be transmitted can be adjusted.

  Next, as a third recognition, the current flowing through the power receiving device decreases as the charging of the power receiving device proceeds. At this time, since the current flowing through the primary side coil also decreases, the change in the current flowing through the primary side coil 11 is detected to determine whether the power receiving device has reached full charge (whether charging has been completed). It is possible to recognize. For example, when any of the transistors TR11, TR12, and TR13 is turned on to transmit power, the full charge determination circuit 35 is carried from the change in the current flowing through the primary coil 11 detected by the current / voltage detection circuit 38. It is determined whether or not the telephone 2 is fully charged. If it is determined that the telephone 2 is fully charged, the power switching circuit 32 is switched, and the transistors TR11, TR12, and TR13 are all turned off to stop power transmission.

  In this way, only when a power receiving device capable of receiving power is placed on the power transmission device 1, power corresponding to the power of the power receiving device can be transmitted, and the placed power receiving device is fully charged. Can stop power transmission. In addition, since it is not necessary to transmit an information signal between the power transmission device 1 and the mobile phone 2 in this way, the power supply system can be simplified.

  FIG. 8 is an external view showing the external appearance of a power transmission device and a mobile phone equipped with the power supply system of the fifth embodiment of the present invention. In FIG. 8, the same parts as those in FIG. 8A shows a state where the power transmission device 1 and the mobile phone 2 are separated from each other, and FIG. 8B shows a state where the mobile phone 2 is placed on the power transmission device 1. As shown in FIG. 8A, the power transmission device 1 is provided with a convex portion 51, and the cellular phone 2 is provided with a concave portion 52. By fitting the convex portion 51 and the concave portion 52, the power transmission device 1 and the cellular phone are fitted. 2 can be aligned. Further, although not shown, a power receiving device other than the mobile phone 2, for example, a power receiving device other than the mobile phone 2 such as a notebook computer, a digital camera, or a PDA is provided with a recess 52 having the same shape as the mobile phone 2. Thus, any device can be aligned with the power transmission device 1. Thereby, one power transmission device 1 can be shared and used by many power receiving devices.

  FIG. 9 is an external view showing the external appearance of a power transmission device and a mobile phone equipped with the power supply system of the sixth embodiment of the present invention. 9, the same parts as those in FIG. 8 are denoted by the same reference numerals, and the description thereof is omitted. 9A shows a state in which the power transmission device 1 and the mobile phone 2 are separated from each other, and FIG. 9B shows a state in which the mobile phone 2 is placed on the power transmission device 1. As shown in FIG. 8A, the power transmission device 1 is provided with a mark 53 indicating a chargeable region and an auxiliary mark (cross mark) 54 for alignment, and the mobile phone 2 is provided with a mark 55 for alignment. It is provided. The mobile phone 2 can be charged by placing the mobile phone 2 so that the mark 55 of the mobile phone 2 falls within the chargeable area of the power transmission device 1, that is, by placing the mobile phone 2 so that the mark 55 and the mark 53 overlap. It becomes. Further, although not shown in the figure, for power receiving devices other than the mobile phone 2, for example, power receiving devices other than the mobile phone 2 such as notebook computers, digital cameras, PDAs, etc., by providing the same mark 55 as the mobile phone 2, Any device can be aligned with the power transmission device 1. Thereby, one power transmission device 1 can be shared and used by many power receiving devices. Further, the alignment by such a mark does not require the uneven portion as in the embodiment shown in FIG. 8, so that the power transmission device 1 and the mobile phone 2 can be thinned.

  FIG. 10 is a block diagram showing an internal configuration of a power transmission device and a mobile phone on which the power supply system according to the seventh embodiment of the present invention is mounted. 10, parts that are the same as the parts shown in FIG. 2 are given the same reference numerals, and explanation thereof is omitted. 10A shows a state where the conventional mobile phone 101 is placed on the power transmission device 1, and FIG. 10B shows a state where the mobile phone 2 is placed on the power transmission device 1. Yes. The power transmission device 1 shown in FIG. 10 is different from the power transmission device 1 shown in FIG. 2 in that the power transmission device 1 can be adapted to the conventional mobile phone 101 that performs charging by obtaining power from the contacted receiving electrodes 101a and 101b. Power transmission electrodes 17a and 17b for supplying power by the equation, an interelectrode current detection circuit (interelectrode current detection means) 18 for monitoring a current flowing between the power transmission electrodes 17a and 17b, and a power path switching circuit (power path switching) Means) 19 is added.

  The interelectrode current detection circuit 18 monitors the current flowing between the power transmission electrodes 17a and 17b, and a conventional contact-chargeable mobile phone 101 is placed on the power transmission device 1 as shown in FIG. When the charging power receiving electrodes 101a and 101b and the power transmission electrodes 17a and 17b come into contact with each other, a current flows between the power transmission electrodes 17a and 17b, so that the presence of the mobile phone 101 is recognized. When the contact-chargeable mobile phone 101 is recognized in this way, the power path switching circuit 19 supplies power only to the power transmission electrodes 17a and 17b. On the other hand, as shown in FIG. 10B, when the non-contact rechargeable mobile phone 2 is placed, power is supplied only to the primary coil 11 side by the power path switching circuit 19 and has been described so far. Power is supplied by the same method as in the above embodiment. In this way, it is possible to perform both contact-type and non-contact-type power supply by one power transmission device 1. Although not shown, charging devices such as a digital camera and a PDA can be charged by the same method in two ways, a contact type and a non-contact type.

  As described above, the power transmission device 1 equipped with the power supply system according to the present invention switches the necessary transmission power according to the power of the power receiving device to three levels of high power, medium power, and low power and transmits the power. Therefore, power can be supplied to different types of electronic devices with one power transmission device. Moreover, since the convex part and the mark were provided in the power transmission apparatus 1 and the concave part and the mark were also provided in the power receiving device, even when a plurality of different types of power receiving apparatuses are placed on the power transmission device 1, The power receiving device can be aligned at a position optimal for power supply. Moreover, since the LED which shows an operation state was provided in the power transmission apparatus 1, the user can recognize the operation state of the power transmission apparatus 1 easily. In addition, since a pair of power transmission electrodes for supplying power to the power transmission device 1 in a contact manner, a current detection circuit for monitoring the current flowing between the pair of power transmission electrodes, and a power path switching circuit are added. The power can also be supplied to a conventional power receiving device that performs charging by obtaining power from the contacted power receiving electrode.

  In the above description, a power transmission device and a mobile phone are described as examples of devices on which the power supply system of the embodiment of the present invention is mounted. However, the power supply system according to the present invention is not limited to a power transmission device and a mobile phone. It can also be applied to other electronic devices. Further, the present invention is not limited to the above-described embodiment, and the configuration of each part can be appropriately changed and implemented without departing from the spirit of the present invention.

  According to the present invention, a power transmission device having a primary side coil and a primary side circuit that applies a pulse voltage obtained by switching a DC voltage obtained by rectifying and smoothing a commercial power source to the primary side coil, and the primary In a power supply system comprising a secondary coil that is magnetically coupled to a side coil and a secondary circuit that rectifies and smoothes an induced voltage induced in the secondary coil, the power of the power receiving apparatus Since the power adjustment means for adjusting the transmission power according to the above is provided, it is possible to realize a power supply system that can supply power to different types of power receiving devices with one power transmission device.

These are the external views which show the external appearance of the power transmission apparatus and power receiving apparatus which mount the electric power supply system of 1st Embodiment of this invention. These are the figures for demonstrating the schematic structure inside a power transmission apparatus and a mobile telephone shown in FIG. These are block diagrams which show the electrical structure of the power transmission apparatus and mobile telephone which are shown in FIG. 1, FIG. These are flowcharts which show the electric power supply operation | movement of the power transmission apparatus shown in FIG. These are block diagrams which show the electrical structure of the power transmission apparatus and power receiving apparatus which mount the electric power supply system of 2nd Embodiment of this invention. These are block diagrams which show the electrical structure of the power transmission apparatus and power receiving apparatus which mount the electric power supply system of 3rd Embodiment of this invention. These are block diagrams which show the electrical structure of the power transmission apparatus and power receiving apparatus which mount the electric power supply system of 4th Embodiment of this invention. These are the external views which show the external appearance of the power transmission apparatus and power receiving apparatus which mount the electric power supply system of 5th Embodiment of this invention. These are the external views which show the external appearance of the power transmission apparatus and power receiving apparatus which mount the electric power supply system of 6th Embodiment of this invention. These are block diagrams which show the internal structure of the power transmission apparatus and power receiving apparatus which mount the electric power supply system of 7th Embodiment of this invention. These are the figures which showed the relationship between the relative position of a power transmission apparatus and a mobile telephone, and the transmission efficiency of electric power and an information signal. These are the figures which showed the display state of LED according to the operation state of a power transmission apparatus. These are the external views which show the external appearance of the mobile phone carrying the conventional power supply system, and its AC adapter. These are the external views which show the external appearance of the notebook personal computer carrying the other conventional power supply system, and its AC adapter. These are the external views which show the external appearance of the shaver which mounts the other conventional power supply system, and its AC adapter.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Power transmission apparatus 1a AC plug 1b Code 2 Mobile phone (power receiving device)
3. Notebook PC (power receiving device)
10 Primary side circuit 11, 11a, 11b, 11x, 11y, 11z Primary side coil 12, 12a, 12b Secondary side coil 13 Secondary side circuit 14 Charging control circuit 15 Primary side core (ferrite)
16 Secondary core (ferrite)
17a, 17b Power transmission electrode 18 Interelectrode current detection circuit (interelectrode current detection means)
19 Power path switching circuit (Power path switching means)
21, 25, 41 Rectifier circuit 22 Switching circuit 23 Transformer 24 Power transmission control IC (power adjustment means)
31 LED display circuit (display means)
32 Power switching circuit (power switching means)
33 Power transmission availability determination circuit (power transmission availability determination means)
34 Electric energy determination circuit (electric energy determination means)
35 Full charge judgment circuit (full charge judgment means)
36 Demodulation circuit (demodulation means)
37 Carrier wave oscillation circuit (carrier wave oscillation means)
38 Current / voltage detection circuit (current / voltage detection means)
42 Power reception control IC (power adjustment means)
43 Clock extraction circuit (clock extraction means)
44 Power-on reset circuit (carrier wave detection circuit)
45 Modulation circuit (modulation means)
46 Voltage clamp circuit 47 Regulator 51 Convex part 52 Concave part 53, 55 Mark 54 Auxiliary mark (mark)
101 Mobile phone 101a, 101b Receiving electrode C1, C2, C3, C4 Capacitor L1, L2, L3 Coil R1, R2 Resistance LED1, LED2 Light emitting diode (display means)
TR1, TR2 transistors TR11, TR12, TR13 transistors (power switching means)

Claims (39)

In a power supply system that supplies power in an electrically non-contact manner from a power transmission device to which commercial power is supplied to a power receiving device,
A power supply system comprising power adjustment means for adjusting transmission power according to the power of the power receiving device. A power transmission device having a primary side coil, and a primary side circuit that applies a pulse voltage obtained by switching a DC voltage obtained by rectifying and smoothing a commercial power source to the primary side coil;
A power receiving device having a secondary coil magnetically coupled to the primary coil, and a secondary circuit for rectifying and smoothing an induced voltage induced in the secondary coil;
In a power supply system consisting of
A power supply system comprising power adjustment means for adjusting transmission power according to the power of the power receiving device.   The primary coil includes a coil having a plurality of taps having different turns, and has power switching means for switching a tap to which the pulse voltage is applied from the plurality of taps according to the power of the power receiving device. The power supply system according to claim 2.   The primary coil includes a plurality of coils having different numbers of turns, and includes a power switching unit that switches a coil to which the pulse voltage is applied from the plurality of coils according to the power of the power receiving device. The power supply system according to claim 2. Carrier wave oscillation means for periodically applying a carrier wave to the primary side coil;
Demodulating means for receiving and demodulating the information signal related to the power receiving device modulated and transmitted from the power receiving device in response to the carrier wave via the primary side coil;
The power supply system according to any one of claims 2 to 4, wherein the primary side circuit includes: A carrier wave oscillating means for periodically applying a carrier wave to the primary side coil, and receiving an information signal related to the power receiving device modulated and transmitted from the power receiving device in response to the carrier wave via the primary side coil. Demodulating means for demodulating in the primary side circuit,
Carrier detection means for detecting the carrier transmitted to the secondary coil, clock extraction means for extracting a clock signal necessary for modulation from the carrier, and when the carrier detection means detects the carrier, A modulation means for modulating the carrier wave based on the clock signal with an information signal and transmitting the modulated carrier wave via the secondary side coil;
5. The power supply system according to claim 3, wherein the transmission power is adjusted by switching the power switching unit based on an information signal demodulated by the demodulation unit.   6. The coil constituting the primary coil, wherein the coil that applies the pulse voltage and the coil that applies the carrier wave and extracts the information signal are the same coil. Power supply system.   6. The coil constituting the primary side coil, wherein the coil for applying the pulse voltage and the coil for applying the carrier wave and taking out the information signal are different coils. Power supply system.   The power supply according to any one of claims 5 to 8, wherein the power adjustment unit has a function of recognizing information of the power receiving device based on an information signal demodulated by the demodulation unit. system.   The power supply system according to any one of claims 5 to 9, wherein the information signal includes a "code indicating that the device is a power receiving device".   The power transmission is performed when a device capable of receiving power is placed on the power transmission device based on a "code indicating that the device is a power receiving device" included in the information signal. The power supply system according to any one of 10.   It has power transmission availability determination means for determining whether a device capable of receiving power is placed on the power transmission device based on a “code indicating that the device is a power receiving device” included in the information signal. The power supply system according to any one of claims 5 to 11. The power transmission availability determination means includes
When the “code indicating that the device is a power receiving device” included in the information signal is a predetermined “code indicating that the device is a power receiving device”, a device capable of receiving power is placed on the power transmission device. And switching the power switching means to apply the pulse voltage to the primary coil,
If the “code indicating that the device is a power receiving device” included in the information signal is not a predetermined “code indicating that the device is a power receiving device”, a device capable of receiving power is not placed on the power transmission device. The power supply system according to claim 12, wherein the power switching unit is switched so as not to apply the pulse voltage to the primary coil after determination. The information signal includes “power consumption information”;
The power supply system according to any one of claims 5 to 13, further comprising: a power amount determination unit that determines a transmission power amount based on "power consumption information" included in the information signal.   The power supply system according to claim 14, wherein the power amount determination unit switches the power switching unit according to the determined transmission power amount. When the power receiving device is a power receiving device that charges a storage battery with power transmitted from the power transmission device,
The power supply system according to claim 5, wherein the information signal includes “full charge information”.   The power supply system according to any one of claims 5 to 16, wherein power transmission is stopped when the power receiving device is fully charged based on "full charge information" included in the information signal. .   The full charge determining means for determining whether or not the power receiving device is fully charged based on “full charge information” included in the information signal. The power supply system described in 1. The full charge determination means includes
If the “full charge information” included in the information signal does not indicate that the power receiving device is fully charged, it is determined that the power receiving device is not fully charged, and the pulse voltage is set to the primary side. Switching the power switching means to apply to the coil,
When the “full charge information” included in the information signal indicates that the power receiving device is fully charged, it is determined that the power receiving device is fully charged, and the pulse voltage is set to the primary side. The power supply system according to claim 18, wherein the power switching unit is switched so as not to be applied to the coil. When the relative position between the power transmission device and the power receiving device is changed, the transmission efficiency of the transmission power and the transmission efficiency of the information signal are changed at a substantially equal rate,
The power transmission availability determination means for determining whether a relative position between the power transmission device and the power receiving device is a position suitable for power transmission based on transmission efficiency of an information signal received by the demodulation means. The power supply system according to any one of claims 5 to 19. The power transmission availability determination means includes
When the transmission efficiency of the information signal received by the information signal receiving means is larger than a predetermined value, it is determined that the relative position between the power transmission device and the power receiving device is a position suitable for power transmission, and the pulse voltage is determined. Switching the power switching means to apply to the primary coil,
When the transmission efficiency of the information signal received by the information signal receiving means is smaller than a predetermined value, it is determined that the relative position between the power transmission device and the power receiving device is not a position suitable for power transmission, and the pulse voltage is set to 1 The power supply system according to claim 20, wherein the power switching means is switched so as not to be applied to the secondary coil.   The power supply according to any one of claims 2 to 4, wherein the primary side circuit has current / voltage detection means for detecting a change in current and / or voltage flowing through the primary side coil. system.   23. The electric power according to claim 22, wherein power is transmitted when a device capable of receiving power is placed on the power transmission device from a change in current and / or voltage detected by the current / voltage detection means. Supply system.   Current / voltage detection means for detecting a change in current and / or voltage flowing in the primary side coil is provided in the primary side circuit, based on a change in current and / or voltage detected by the current / voltage detection means. The power supply system according to claim 3 or 4, wherein the power switching means is switched to adjust transmission power.   25. The power adjustment unit has a function of recognizing information of the power receiving device based on a change in current and / or voltage detected by the current / voltage detection unit. The power supply system according to any one of the above.   It has power transmission availability determination means for determining whether or not a device capable of receiving power is mounted on the power transmission device based on a change in current and / or voltage detected by the current / voltage detection means. The power supply system according to any one of claims 22 to 25. The power transmission availability determination means includes
If there is a change in the current and / or voltage detected by the current / voltage detection means, it is determined that a device capable of receiving power is placed on the power transmission device, and the pulse voltage is determined as the primary voltage. Switching the power switching means to apply to the side coil,
If there is almost no change in the current and / or voltage detected by the current / voltage detection means, it is determined that a device capable of receiving power is not placed on the power transmission device, and the pulse voltage is set to 1 27. The power supply system according to claim 26, wherein the power switching means is switched so as not to be applied to the secondary coil.   28. The apparatus according to any one of claims 22 to 27, further comprising a power amount determination unit that determines a transmission power amount based on a change in current and / or voltage detected by the current / voltage detection unit. Power supply system.   The power supply system according to claim 28, wherein the power amount determination unit switches the power switching unit according to the determined transmission power amount. When the power receiving device is a power receiving device that charges a storage battery with power transmitted from the power transmission device,
30. The power transmission is stopped when the power receiving device is fully charged based on a change in current and / or voltage detected by the current / voltage detection means. Power supply system. When the power receiving device is a power receiving device that charges a storage battery with power transmitted from the power transmission device,
The full charge determination means for determining whether or not the power receiving device is fully charged based on a change in current and / or voltage detected by the current / voltage detection means. 30. The power supply system according to any one of 30. The full charge determination means includes
When there is a change in the current and / or voltage detected by the current / voltage detection means, it is determined that the power receiving device is not fully charged and the pulse voltage is applied to the primary coil. Switch power switching means,
When there is almost no change in the current and / or voltage detected by the current / voltage detection means, it is determined that the power receiving device is fully charged and the pulse voltage is not applied to the primary coil. 32. The power supply system according to claim 31, wherein the power switching means is switched.   When power is supplied from the power transmission device to the power receiving device, a convex portion is provided on one of the opposing surfaces of the power transmission device and the power receiving device, a concave portion is provided on the other, and the convex portion and the concave portion are fitted. The power supply system according to any one of claims 1 to 32, wherein the power transmission device and the power receiving device can be aligned.   The power transmission device and the power receiving device are provided by providing a mark indicating a region where power can be supplied on each of the opposing surfaces of the power transmission device and the power receiving device when power is supplied from the power transmission device to the power receiving device. The power supply system according to any one of claims 1 to 33, wherein the power supply system can be aligned with each other.   The power supply system according to any one of claims 1 to 34, wherein the power transmission device is provided with display means for indicating the amount of power transmitted by the power transmission device.   When the power receiving device is a power receiving device that charges a storage battery with electric power transmitted from the power transmitting device, a display unit is provided on the power transmitting device to indicate that the power receiving device is fully charged. The power supply system according to any one of claims 1 to 35.   The power transmission device is provided with display means for indicating that the power receiving device has been removed from above the power transmission device after power transmission from the power transmission device to the charging device is started. Item 37. The power supply system according to any one of Items 36.   When the relative position between the power transmission device and the power receiving device is not a position suitable for power transmission, the power transmission device is provided with a display unit that indicates that the relative position between the power transmission device and the power reception device is not a position suitable for power transmission. The power supply system according to any one of claims 1 to 37, wherein:   When the power receiving device is a power receiving device that receives power supply from a pair of contact type power receiving electrodes, a pair of power transmitting electrodes that supply power by contacting the pair of power receiving electrodes; and An inter-electrode current detecting means for detecting a current flowing between the pair of power transmitting electrodes when the pair of contact-type receiving electrodes and the pair of power transmitting electrodes are in contact; A power path switching means for switching between a path for supplying transmission power to the pair of power transmission electrodes and a path for supplying transmission power to the primary coil according to a detection result is provided in the power transmission device. The power supply system according to any one of claims 2 to 38.

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