JP2014023323A - Power transportation method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To transmit a large amount of recording data quickly and stably from a portable device to a charging base while charging a battery of the portable device.SOLUTION: In a power transportation method, a power reception coil 31 of a portable device 30 incorporating a battery 32 and a memory 39, and a power transmission coil 11 of a charging base 10 are electromagnetically coupled with each other, and power transportation from the charging base 10 to the portable device 30 is performed by an electromagnetic induction action to charge the battery 32 of the portable device 30, and further, recording data in the memory 39 of the portable device 30 is transmitted to the charging base 10 by wireless communication. In the power transportation method, at a wireless transmission timing when the recording data in the memory 39 is transmitted wirelessly from the portable device 30 to the charging base 10, the power transportation from the charging base 10 to the portable device 30 is interrupted. By alternately repeating a power transportation timing of power transportation from the charging base 10 to the portable device 30, and the wireless transmission timing, power is transported from the charging base 10 to the portable device 30, and the recording data in the memory 39 is transmitted from the portable device 30 to the charging base 10 wirelessly.

Description

  The present invention relates to a power transfer method for transferring power from a charging stand to a portable device by electromagnetic induction to charge a battery built in the portable device, and in particular, recording data stored in a memory from the portable device to the charging stand wirelessly. The present invention relates to a power carrying method for charging a battery of a portable device while transmitting.

  A power carrying method has been developed in which a portable device is mounted on a charging stand, and power is transferred from a power transmission coil of the charging stand to a power receiving coil of the portable device by electromagnetic induction to charge a battery of the portable device. (See Patent Document 1)

  The method of contactlessly charging the battery of the portable device by transferring power from the power transmission coil to the power receiving coil is characterized in that it is not necessary to connect the portable device to a charger via a lead wire or a connector and can be used conveniently. This charging stand can charge a built-in battery by placing a portable device such as a camera or a mobile phone on the charging stand. In addition, the charging base modulates the load impedance of the power receiving coil from the portable device to the charging base, and transmits a signal to the charging base. When the load impedance of the power receiving coil changes, the current and voltage of the power transmission coil change. Therefore, the charging stand can detect the current of the power transmission coil and the like, and can detect a signal transmitted from a mobile phone or the like. With this transmission method, recorded data stored in the memory of the camera or portable device can be transmitted to the charging stand. However, this transmission method has a drawback that the transmission speed cannot be increased, and it takes much time to transmit a large amount of recording data. This is because the frequency at which power is transferred from the power transmission coil of the charging stand to the power reception coil of the portable device limits the transmission speed. The transmission speed can be increased by increasing the frequency of the power carrier, but if the frequency is increased, the power transmission efficiency of the power carrier is reduced, so the frequency cannot be increased.

JP 2009-273327 A

  This drawback can be solved by wirelessly transmitting recorded data from the portable device to the charging stand. Since wireless transmission can significantly increase the frequency of the carrier wave, the transmission speed can be considerably increased. However, in wireless transmission, a simple signal such as a battery full charge signal can be transmitted from the portable device to the charging stand. However, if a large amount of recorded data is transmitted wirelessly, a transmission error occurs and it is reliably stable. The recorded data cannot be transmitted. This is because harmonics of the AC signal supplied to the power transmission coil become noise in wireless transmission and reduce the S / N ratio of the signal. This disadvantage can be solved by stopping the charging of the battery of the portable device when transmitting the recording data. However, if the charging of the battery is stopped and the recording data is transmitted, the recording data cannot be transmitted when the battery of the portable device is discharged and the remaining capacity is reduced.

  The present invention has been developed for the purpose of solving the above drawbacks. An important object of the present invention is to provide a power transfer method capable of quickly and stably transmitting a large amount of recorded data from a portable device to a charging stand while charging a battery of the portable device.

Means for Solving the Problems and Effects of the Invention

  In the power transfer method of the present invention, the power receiving coil 31 of the portable device 30 incorporating the battery 32 and the memory 39 and the power transmission coil 11 of the charging stand 10 are electromagnetically coupled, and electromagnetic induction action is applied from the charging stand 10 to the portable device 30. Then, the battery 32 of the portable device 30 is charged and the recorded data in the memory 39 of the portable device 30 is wirelessly transmitted to the charging base 10 by wireless communication. In the power transfer method, at the wireless transmission timing when the recorded data of the memory 39 is wirelessly transmitted from the portable device 30 to the charging stand 10, the power transfer is interrupted from the charging stand 10 to the portable device 30, and The power transfer timing for transferring power and the wireless transmission timing are alternately repeated to transfer power from the charging stand 10 to the portable device 30, and record data in the memory 39 is wirelessly transmitted from the portable device 30 to the charging stand 10.

  The above power transfer method is characterized in that a large amount of recorded data can be quickly and stably transmitted from the portable device to the charging stand while charging the battery of the portable device. In particular, since the recording data in the memory is wirelessly transmitted from the portable device to the charging stand while charging the battery of the portable device, the wireless transmission is not interrupted due to the battery running out during the wireless transmission of the recording data. The memory recording data can be reliably and stably transmitted to the charging stand. Further, since the battery is charged while transmitting the recording data, the battery is gradually charged while transmitting the recording data wirelessly.

In the power transfer method of the present invention, the power transfer timing can be interrupted by the timer 16 of the charging stand 10.
This power transfer method is characterized in that it is not necessary to transmit a signal for interrupting the power transfer timing from the portable device to the charging stand while the power is being transferred, and the power transfer timing can be reliably interrupted. When a signal that interrupts the power transfer timing from the portable device to the charging stand is wirelessly transmitted while the charging stand is carrying power, the harmonics emitted from the power transmission coil become noise, and the interruption signal is reliably transmitted. However, since the charging stand interrupts the power transfer timing with a timer, the charging stand can reliably interrupt the power transfer timing without transmitting an interruption signal from the portable device.

In the power transfer method of the present invention, the wireless transmission timing can be interrupted by the timer 46.
In the above power transfer method, since the wireless transmission timing is interrupted by the timer, the wireless transmission timing can be interrupted reliably. In addition, since the time width of the wireless transmission timing can be set to a certain time, the recording data can be transmitted while efficiently transferring power from the charging stand to the portable device. This is because AC power carried from the portable device can be rectified and converted to DC, stored in a smoothing capacitor of the power source, and charged by supplying a charging current to the battery while discharging the smoothing capacitor. The smoothing capacitor is instantaneously charged with the electric power conveyed, and the stored electric power can be supplied to the battery in a state where the electric power conveyance is interrupted. Therefore, even when the power transfer is interrupted, the battery is continuously charged and the battery can be charged efficiently.

In the power transfer method of the present invention, the time width of the wireless transmission timing can be set to 100 msec or less.
In the above power transfer method, the time width of the wireless transmission timing is shortened to 100 msec or less, so that the time width for interrupting the power transfer timing can be shortened. This method is characterized in that the time required to charge the battery by discharging the stored smoothing capacitor is short, and the battery can be continuously charged while maintaining a constant voltage.

In the power transfer method of the present invention, the time width of the wireless transmission timing can be set to 10 msec or less.
In this method, the time width of the wireless transmission timing is further shortened to 10 msec or less, so that the interruption time of the power transfer timing is further shortened, and the battery is continuously maintained while being held at a constant voltage with a smoothing capacitor to be charged and discharged. And can be charged efficiently.

In the power transfer method of the present invention, the wireless transmission timing can be interrupted by the amount of recording data transmitted from the portable device 30 to the charging stand 10.
In this power transfer method, the wireless transmission timing is interrupted after wirelessly transmitting a predetermined amount of recording data, so that the battery of the portable device can be charged while efficiently transmitting the recording data wirelessly.

The power transfer method of the present invention wirelessly transmits a power transfer start signal for starting power transfer timing from the portable device 30 to the charging stand 10, and the charging stand 10 detects the start signal of wireless transmission and starts the power transfer timing. can do.
In the above power transfer method, since the charging base starts power transfer with the start signal transmitted wirelessly from the portable device, the power transfer timing start signal is reliably transmitted from the portable device to the charging stand to The conveyance timing can be started.

In the power transfer method of the present invention, the communication line 52 of the microcomputer 51 is connected to the charging base 10, and a control signal for controlling the power transfer timing is transmitted from the microcomputer 51 to the charging base 10 via the communication line 52. The power transfer timing of the charging stand can be controlled.
In the above power transfer method, the microcomputer can control the power transfer timing and the wireless transmission timing, and can transmit the recording data wirelessly while efficiently transferring the power.

The power transfer method of the present invention displays that the battery 32 is in the charged state at the power transfer timing on the display means 43 of the portable device 30 and also displays that the battery 32 is in the charged state at the wireless transmission timing. 43 can be displayed.
In the above power transfer method, the battery charging state is displayed on the display unit of the portable device at the power transfer timing, so that the user can visually recognize the battery charging state and the battery is charged at the wireless transmission timing. By displaying that the battery is in a state, the user can recognize that the battery is being charged.

It is a block diagram of the charging stand and portable device which are used for the electric power conveyance method concerning one embodiment of the present invention. It is a perspective view which shows an example of the charging stand shown in FIG. 1, and a portable apparatus. The output waveform of a rectifier circuit is shown. It is a block diagram which shows another example of a display means. It is a flowchart which shows an example which conveys electric power from a charging stand to a portable device, and transmits recording data from a portable device to a charging stand.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. However, the embodiment described below exemplifies a power transfer method for embodying the technical idea of the present invention, and the present invention does not specify the power transfer method as the following method. Further, in this specification, in order to facilitate understanding of the scope of claims, numbers corresponding to the members shown in the embodiments are indicated in “Claims” and “Means for Solving the Problems”. It is appended to the members shown. However, the members shown in the claims are not limited to the members in the embodiments.

  FIG. 1 shows a block diagram of the charging stand 10 and the portable device 30. The charging stand 10 includes a power transmission coil 11 that carries power to the power receiving coil 31 of the mobile device 30, an AC power source 12 that supplies AC power to the power transmission coil 11, and a receiver 13 that receives radio waves transmitted from the mobile device 30. And. The charging stand 10 in this figure includes a communication circuit 14 that transmits data wirelessly transmitted from the portable device 30 to the microcomputer 51. The charging stand 10 can also incorporate a memory 19 for storing data wirelessly transmitted from the portable device 30. The charging stand 10 stores data transmitted from the portable device 30 in the memory 19. Data stored in the memory 19 can be transmitted from the communication circuit 14 to the microcomputer 51 via the communication line 52. A perspective view of the charging stand 10 and the portable device 30 is shown in FIG. The charging stand 10 in this figure is set so that the portable device 30 can be attached to and detached from the charging stand 10, and power is transferred to the portable device 30 to charge the battery 32. Further, the charging stand 10 of FIG. 2 is externally connected to a personal computer 50 containing a microcomputer 51 via a communication line 52.

  The portable device 30 includes a memory 39 and a battery 32 that can be charged, and outputs the recorded data in the memory 39 to the outside. The portable device 30 is, for example, a digital camera or a mobile phone. The portable device 30 wirelessly transmits the recording data to the charging stand 10 and stores the wirelessly transmitted recording data in the memory 19 of the charging stand 10 or in the memory 59 of the microcomputer 51 via the charging stand 10. The present invention does not specify the mobile device 30 as a digital camera or a mobile phone. A digital camera or mobile phone stores a large amount of image data in the memory 39 and transmits it to the microcomputer 51 for processing.

  1 includes a power receiving coil 31 that is electromagnetically coupled to the power transmitting coil 11, a rectifier circuit 36 that converts alternating current induced in the power receiving coil 31 into direct current, and a direct current battery that is output from the rectifier circuit 36. A charge control circuit 37 for charging 32, a memory 39 for storing data such as image data, and a transmitter 33 for wirelessly transmitting recording data stored in the memory 39 to the charging stand 10.

  The mobile device 30 of FIG. 1 includes a modulation circuit 35 that transmits a full charge signal of the battery 32 to the charging stand 10. The modulation circuit 35 transmits the information signal of the battery 32 to the charging stand 10. The information signal is a signal indicating the remaining capacity, voltage, current, temperature, full charge, etc. of the battery 32 being charged. When the portable device 30 transmits a full charge signal as an information signal to the charging stand 10, the charging stand 10 detects this full charge signal, stops the power supply to the power transmission coil 11, and stops the charging of the battery 32. . Moreover, the charging stand 10 detects the information signal of the battery 32 transmitted from the portable device 30, controls the power supplied to the power transmission coil 11, and charges the battery 32 with a preferable voltage and current. The modulation circuit 35 includes a series circuit of a parallel capacitor 41 and a switching element 42 and is connected in parallel with the power receiving coil 31. The modulation circuit 35 switches the switching element 42 on and off, changes the load impedance of the power receiving coil 31, and transmits an information signal such as a full charge signal of the battery 32 input from the charge control circuit 37 to the charging stand 10. . The modulation circuit 35 connects the parallel capacitor 41 in parallel with the power receiving coil 31 when the switching element 42 is on, and does not connect the parallel capacitor 41 to the power receiving coil 31 when the switching element 42 is off. The modulation circuit 35 switches between a state in which the parallel capacitor 41 is connected and a state in which the parallel capacitor 41 is not connected, changes the load impedance of the power receiving coil 31, and transmits the information signal to the charging stand 10. The modulation circuit 35 keeps the switching element 42 in an off state in a state where no signal is transmitted to the charging stand 10, and does not connect the parallel capacitor 41 to the power receiving coil 31. This is because in a state where the parallel capacitor 41 is connected to the power receiving coil 31, power transmission efficiency for carrying power from the power transmitting coil 11 to the power receiving coil 31 is reduced.

  The charging stand 10 includes a detection circuit 15 that detects a change in load impedance of the power receiving coil 31 as a change in load impedance of the power transmission coil 11 and detects an information signal such as a full charge signal. The detection circuit 15 detects an information signal of the battery 32 by detecting a change in load impedance of the power transmission coil 11 from a change in current or voltage of the power transmission coil 11 in a state where power is conveyed. The charging stand 10 and the portable device 30 reliably transfer the information signal of the battery 32 from the portable device 30 to the charging stand 10 in a state where power is transferred from the charging stand 10 to the portable device 30 without interrupting the power transfer. To transmit. Therefore, charging can be stopped when the battery 32 is fully charged. However, the charging control circuit 37 can also transmit the charging state of the battery 32 to the charging stand 10 via the transmitter 33. When the information signal of the battery 32 is transmitted from the transmitter 33 to the receiver 13 in the state of carrying power, the AC harmonics of the power transmission coil 11 cause noise. In order to reduce the influence of noise, the transmitter 33 lowers the transmission speed and repeatedly transmits the state of charge of the battery 32 and wirelessly transmits the state of charge of the battery 32 to the receiver 13 of the charging stand 10. To do. This is because wireless transmission can reduce the influence of noise by reducing the transmission speed.

  The charge control circuit 37 charges the battery 32 with the electric power input from the rectifier circuit 36, and outputs a full charge signal to stop the charge of the battery 32 when the battery 32 is fully charged. The charge control circuit 37 that charges the battery 32 that is a lithium ion battery fully charges the battery 32 by performing constant voltage / constant current charging. A charge control circuit that charges a battery that is a nickel-metal hydride battery fully charges the battery by constant current charging.

  The portable device 30 is set on the charging base 10 and transmits the recorded data in the memory 39 to the charging base 10 by the transmitter 33 in a state where power is transferred from the power transmission coil 11 to the power reception coil 31. When the battery 32 is fully charged while the recorded data in the memory 39 is being transmitted to the charging stand 10, a full charge signal is transmitted to the charging stand 10 to temporarily stop the charging of the battery 32. In a state where charging of the battery 32 is stopped, the remaining capacity and voltage of the battery 32 are transmitted to the charging stand 10 as an information signal of the battery 32. Therefore, when the remaining capacity of the fully charged battery 32 becomes lower than a preset value, for example, 80% to 95%, the power transfer is started again, and the recorded data in the memory 39 is transferred while the power is transferred. Transmit to the charging stand 10.

  If the recording of the memory 39 is wirelessly transmitted from the portable device 30 to the charging base 10 and the charging of the battery 32 is interrupted, the battery 32 is completely discharged while the recording data is wirelessly transmitted. Wireless transmission of recorded data may be interrupted. In order to prevent this problem, the present invention wirelessly transmits the recorded data in the memory 39 from the portable device 30 to the charging base 10 while continuing the power transfer, that is, while the battery 32 is being charged. However, when the recording data in the memory 39 is wirelessly transmitted from the portable device 30 to the charging stand 10 in a state where alternating current is supplied to the power transmission coil 11, the AC harmonics of the power transmission coil 11 become noise of wireless transmission, Impedes stable wireless transmission. In order to prevent this problem, the present invention wirelessly transmits the recording data in the memory 39 while repeating the wireless transmission timing for wirelessly transmitting the recording data and the power conveyance timing for conveying the power to charge the battery 32. . That is, the recording data of the memory 39 is wirelessly transmitted while charging the battery 32 of the portable device 30.

  That is, the power transfer method of the present invention temporarily interrupts the power transfer from the charging stand 10 to the portable device 30 at the wireless transmission timing for wirelessly transmitting the recorded data of the memory 39 from the portable device 30 to the charging stand 10. The power transfer timing and the wireless transmission timing for transferring power from the charging stand 10 to the portable device 30 are alternately repeated to transfer power from the charging stand 10 to the portable device 30, and from the portable device 30 to the charging stand 10. Record data is transmitted wirelessly.

  The time width of the power transfer timing is specified by the timer 16. The charging stand 10 of FIG. 1 is provided with a timer 16 for storing a time width for supplying AC power to the power transmission coil 11, that is, a time width of power transfer timing, in the AC power source 12. The timer 16 starts counting when the power transfer timing is started, and time is up to interrupt the power supply to the power transmission coil 11. The set time of the timer 16 specifies the time width of the power transfer timing. The charging stand 10 to which the microcomputer 51 is connected can interrupt power supply to the power transmission coil 11 with an interruption signal that is a control signal input from the microcomputer 51. The microcomputer 51 outputs an interruption signal to the charging stand 10 when the time width for specifying the power transfer timing elapses. The set time of the timer 16 is, for example, 1 sec or less, preferably 100 msec or less, more preferably 10 msec or less. The set time of the timer 16 can be shortened so that recorded data can be quickly transmitted wirelessly, and the set time can be increased to quickly charge the battery 32. If the set time of the timer 16 is too short, that is, if the power transfer timing is too short, the battery 32 cannot be quickly charged. Further, the battery 32 cannot be efficiently charged even if it is shorter than one cycle of the alternating current supplied to the power transmission coil 11. Therefore, the set time of the timer 16 is longer than 10 μsec, preferably longer than 100 μsec.

  The mobile device 30 in FIG. 1 includes a control circuit 34 that controls wireless transmission timing for wirelessly transmitting recorded data in the memory 39. The control circuit 34 controls the timing at which the transmitter 33 transmits recording data, that is, the wireless transmission timing. The control circuit 34 includes a timer 46 that stores a time zone of wireless transmission timing. The timer 46 starts counting when wireless transmission of the recording data in the memory 39 is started, time is up, and the wireless transmission of the recording data is interrupted. The set time of the timer 46 that specifies the time zone of the wireless transmission timing is, for example, 100 msec or less, more preferably 10 msec or less. The wireless transmission timing is a time for interrupting power transfer. Further, the portable device 30 wirelessly transmits a power transfer start signal for starting the power transfer timing to the charging base 10 at a timing at which the wireless transmission of the recording data is interrupted. The charging stand 10 detects the wireless transmission start signal and restarts the power transfer timing. The charging stand 10 can reliably resume power transfer with a start signal wirelessly transmitted from the portable device 30.

  FIG. 3 shows the output waveform of the rectifier circuit 36. This figure shows the output waveform of the rectifier circuit 36 in a state where the power transfer timing and the wireless transmission timing are repeated. As shown in this figure, the output voltage of the rectifier circuit 36 does not become a complete direct current but becomes a pulsating flow. At the power transfer timing, the parallel capacitor 41 is charged to a constant voltage, and at the wireless transmission timing, the power is not transferred, so the parallel capacitor 41 is discharged and the voltage gradually decreases. The charge control circuit 37 includes a constant voltage circuit that stabilizes the voltage output from the rectifier circuit 36 to a voltage optimum for charging the battery 32. Therefore, when the stabilization voltage of the constant voltage circuit is set lower than the minimum voltage of the pulsating current output from the rectifier circuit 36, the output voltage of the constant voltage circuit is always maintained at a constant voltage, and the battery 32 is continued. That is, charging can be performed without interruption even at the wireless transmission timing. For this reason, although the power transfer is interrupted, the charging of the battery 32 is not interrupted, and the recording data in the memory 39 can be quickly transmitted wirelessly while the battery 32 is being charged quickly.

  The minimum voltage of the pulsating current is specified by the time during which the power transfer is interrupted, that is, the wireless transmission timing, the capacitance of the parallel capacitor 41, and the output current. The battery 32 can be continuously charged by shortening the time width of the wireless transmission timing and increasing the capacitance of the parallel capacitor 41. Further, the charging control circuit 37 is equipped with a constant voltage circuit composed of a DC / DC converter that boosts the output voltage of the rectifying circuit 36 and stabilizes it to a voltage for charging the battery 32 so that the minimum voltage of the pulsating current is charged. Even when the output voltage of the control circuit 37 becomes lower, the battery 32 can be continuously charged. This is because even if the minimum voltage of the pulsating current is lower than the output voltage of the charging control circuit 37, the voltage can be boosted by the DC / DC converter and the battery 32 can be charged as a constant voltage. Therefore, according to the above circuit configuration, although the power transfer is interrupted, the characteristic that the recorded data of the memory 39 can be wirelessly transmitted efficiently and quickly without interrupting the charging of the battery 32 is realized.

  Furthermore, the portable device 30 can interrupt wireless transmission with the amount of recording data transmitted from the portable device 30 to the charging stand 10. The portable device 30 detects the amount of data transmitted to the charging stand 10 with the control circuit 34 and interrupts wireless transmission when a predetermined amount of recording data is transmitted. In this method, since the wireless transmission timing is interrupted at the timing when a predetermined amount of recording data is wirelessly transmitted, wireless transmission can be performed efficiently.

  When the charging stand 10 detects a signal for starting transmission of recording data of the portable device 30 to the memory 59 of the microcomputer 51 or the memory 19 of the charging stand 10, that is, a transmission request signal, the charging carrier timing and the wireless transmission timing are detected. The data stored in the memory 39 of the portable device 30 is transmitted to the memory 59 or recorded in the memory 19 while charging the battery 32 of the portable device 30. The charging stand 10 that does not detect the transmission request signal continuously carries power to the portable device 30 and charges the battery 32.

  The transmission request signal is transmitted as a control signal from the microcomputer 51 connected to the charging stand 10 to the charging stand 10, and is transmitted from the charging stand 10 to the portable device 30. However, the transmission request signal can also be output from the portable device 30 or the charging stand 10. The portable device 30 and the charging stand 10 include an operation switch (not shown) that outputs a transmission request signal. The operation switch is operated when the user wants to transmit the recording data of the portable device 30 to the memory 59 of the microcomputer 51 or the memory 19 of the charging stand 10 and outputs a transmission request signal.

  In a state where the microcomputer 51 is connected to the charging stand 10, a user who wants to transmit recording data to the memory 59 operates a keyboard of the microcomputer 51 to transmit a transmission request signal as a control signal to the charging stand 10. . The charging stand 10 transmits a transmission request signal transmitted from the microcomputer 51 to the portable device 30. The charging stand 10 that transmits the transmission request signal of the microcomputer 51 to the portable device 30 includes the sub-transmitter 18, and the portable device 30 includes the sub-receiver 38 that receives the transmission request signal transmitted from the sub-transmitter 18. A transmission request signal input from the microcomputer 51 to the charging stand 10 is transmitted from the sub transmitter 18 of the charging stand 10 to the sub receiver 38 of the portable device 30. The mobile device 30 that has received the transmission request signal wirelessly transmits the recording data to the charging stand 10 at the wireless transmission timing.

  When the portable device 30 detects the transmission request signal from the charging stand 10, the portable device 30 transmits a charging stop signal to the charging stand 10. The charge stop signal is wirelessly transmitted from the transmitter 33 of the portable device 30 to the receiver 13 of the charging stand 10, or is transmitted from the modulation circuit 35 of the portable device 30 to the detection circuit 15 of the charging stand 10. The method of wirelessly transmitting the charge stop signal is wirelessly transmitted before starting the power transfer, or is wirelessly transmitted at a reduced transmission speed in a state where the power is transferred. A method of transmitting a charge stop signal from the modulation circuit 35 to the detection circuit 15 is transmitted while carrying power.

  When the charging stand 10 receives the transmission request signal, the battery 32 is charged while repeating the power transfer timing and the wireless transmission timing, and receives the recording data. When the charging stand 10 does not receive a transmission request signal, the charging stand 10 supplies AC power to the power transmission coil 11 in a normal state without repeating the power transfer timing and the wireless transmission timing, that is, continuously. The battery 32 is charged.

  Further, the portable device 30 of FIG. 1 includes a display unit 43 that displays the charging state of the battery 32. The display means 43 shown in the figure includes a display unit 44 including a light source 44A such as an LED, and a lighting circuit 45 that controls the lighting state of the light source 44A. The display means 43 receives a signal indicating that the battery 32 is in a charged state from the charge control circuit 37 to the lighting circuit 45 when the charge control circuit 37 charges the battery 32, and the lighting circuit 45 44A is turned on and the state of charge of the battery 32 is displayed to the outside. Further, when the battery 32 is fully charged, the display means 43 can change the lighting color of the light source 44A or stop the lighting so that the user can recognize that the battery 32 is fully charged.

  Further, the display unit 43 displays the charging state of the battery 32 by lighting the light source 44A at the power transfer timing in a state where the power transfer timing and the wireless transmission timing are alternately repeated, and also at the wireless transmission timing. The light source 44A is turned on to indicate that the battery 32 is being charged. The reason is that if the lighting of the light source 44A is interrupted at the wireless transmission timing, the light source 44A is repeatedly turned on and off in a short time to prevent the user from suspecting that the device is abnormal and becoming anxious. The display means 43 displays that the battery 32 is charged even in the data transmission state by turning on the light source 44A that displays the charging state of the battery 32 not only at the power transfer timing but also at the wireless transmission timing. The user can be recognized from the display of the unit 44. The display means 43 can be realized, for example, by the lighting circuit 45 continuously turning on the light source 44A without turning it off even at the wireless transmission timing. That is, when the charging of the battery 32 is started, the lighting circuit 45 lights the light source 44A continuously until the charging of the battery 32 is completed, thereby indicating that the battery 32 is being charged. it can.

  The lighting circuit 45 can turn on the light source 44A even at the wireless transmission timing by adopting a circuit configuration that continuously outputs power to the light source 44A. However, the lighting circuit may have the circuit configuration shown in FIG. The lighting circuit 45 shown in this figure has a capacitor 47 connected to a power supply line 49 that supplies power to the light source 44A. A diode 48 for blocking reverse current is connected to the charge control circuit 37 side of the power supply line 49 to which the capacitor 47 is connected. The lighting circuit 45 illuminates the light source 44A with the power supplied from the charging control circuit 37 and the power supplied from the charging control circuit 37 at the timing when the charging control circuit 37 charges the battery 32 at the power transfer timing. Is stored in the capacitor 47. At the wireless transmission timing, at the timing when the charging control circuit 37 interrupts the charging of the battery 32, power is not supplied from the charging control circuit 37 to the light source 44 </ b> A, but the light source 44 </ b> A is turned on with the power supplied from the capacitor 47. Here, since the wireless transmission timing is set to a short time, for example, 100 msec or less, preferably 10 msec or less, the light source 44 </ b> A can be continuously turned on without increasing the capacity of the capacitor 47. Further, the lighting circuit 45 does not necessarily have to turn on the light source 44A continuously, and can turn off the light source 44A for a short time that the user cannot identify the turning off of the light source 44A.

  Furthermore, the lighting circuit 45 is in a state where the power transfer timing and the wireless transmission timing are alternately repeated, that is, in a state where a signal indicating that the battery 32 is in a charged state is input from the charge control circuit 37 at a predetermined cycle. It can also be determined that data is being transmitted from the portable device 30 to the charging stand 10 side, and the display on the display unit 44 can be displayed differently from that during charging. For example, the display unit 43 lights the light source 44A in red in a charging state in which only the battery 32 is charged, and lights the light source 44A in orange in a charging state in which data is transmitted while charging the battery 32, or red. When the battery 32 is completely charged, the light source 44A can be turned on or turned off in blue, and the display on the display unit 44 can be changed according to the state of charge of the battery 32. Thus, the user can check the battery charging state and the data transmission state while identifying them.

  However, the display means is not necessarily specified in the above structure. Although not shown, the display means can also display the state of charge of the battery externally by changing the display content of the liquid crystal screen with a control circuit using the liquid crystal screen as the display unit. In addition to displaying the charging of the battery on the liquid crystal screen at the power transfer timing, this display means can also continuously display the charging of the battery at the wireless transmission timing.

  The charging stand 10 and the portable device 30 transfer power from the charging stand 10 to the portable device 30 and transmit recording data from the portable device 30 to the charging stand 10 in the flowchart of FIG. In the following flowchart, the microcomputer 51 is connected to the charging base 10 via the communication circuit 14, and the recording data stored in the memory 39 of the portable device 30 is transmitted via the charging base 10 by a transmission request signal from the microcomputer 51. The process of transmitting to the memory 59 of the microcomputer 51 is shown.

[Step of n = 1] Charging start When the portable device 30 is set on the charging stand 10, charging of the portable device 30 is started. In this step, the charging stand 10 supplies AC power from the AC power supply 12 to the power transmission coil 11. The power reception coil 31 of the portable device 30 is electromagnetically coupled to the power transmission coil 11 to induce AC power. The alternating current induced in the receiving coil 31 is converted into direct current by the rectifier circuit 36 and input to the charging control circuit 37. The charging control circuit 37 adjusts the input direct current to the charging voltage and current of the battery 32 to 32 is charged.

[Step n = 2] ... Is a transmission request signal detected? Power is transferred from the charging base 10 to the mobile device 30 and charging of the mobile device 30 is started, and then the user operates the microcomputer 51 to operate the mobile device 30. When recording data such as image data stored in the memory 39 is transmitted to the memory 59 of the microcomputer 51, a transmission request signal is transmitted from the microcomputer 51 to the charging base 10, and the charging base 10 receives the transmission request signal. Transmit to the mobile device 30. Until the transmission request signal is detected, that is, until the microcomputer 51 requests that the recording data in the memory 39 of the portable device 30 be transmitted to the memory 59, a step loop of n = 1 and 2 is performed. That is, the battery 32 is charged by continuously conveying power from the charging stand 10 to the portable device 30.

[Step n = 3] ... Transmission of Charge Stop Signal When the portable device 30 detects a transmission request signal, the charge stop signal is transmitted from the portable device 30 to the charging stand 10 in this step. The charging stand 10 detects a charge stop signal and interrupts power transfer.
[Steps of n = 4 to 6]... Record data is transmitted to charging base 10 (wireless transmission timing)
After the charging stand 10 interrupts the power transfer by the charging stop signal, the portable device 30 wirelessly transmits the recording data stored in the memory 39 to the charging stand 10. The portable device 30 wirelessly transmits the recording data to the charging stand 10 until a certain time elapses. The wireless transmission timing time for wirelessly transmitting the recording data is specified by the timer 46 of the control circuit 34. The charging stand 10 transmits the recording data transmitted wirelessly to the microcomputer 51 via the communication circuit 14. The microcomputer 51 stores the transmitted recording data in the memory 59.
n = 4 to 6 is a wireless transmission timing.
[Step n = 7-9] ... Transmitting Power Carrying Start Signal After the transmitter 33 of the portable device 30 interrupts the wireless transmission of the recording data, the portable device 30 sends the power carrying start signal to the charging stand 10. Is transmitted wirelessly. The charging stand 10 detects this start signal and resumes the power transfer to the portable device 30. After a certain time has elapsed after resuming the power transfer, the process returns to the step of n = 3 and the power transfer is interrupted.
n = 7-9 is a power conveyance timing.
[Step of n = 10] ... Transmitting the power carrier start signal Thereafter, until the wireless transmission of all the recording data is completed, the steps of n = 3 to 9 are looped, and all the recordings are performed in the step of n = 5. When it is determined that the wireless transmission of data is completed, the process proceeds to step n = 10, a power transfer start signal is transmitted, charging is resumed, and the battery 32 of the portable device 30 is fully charged.
Thereafter, when the battery 32 of the portable device 30 is fully charged, a full charge signal is transmitted from the portable device 30 to the charging stand 10, and the charging stand 10 stops carrying power.

  The power transfer method according to the present invention is built in since the power is transferred from the charging stand to the portable device, and further, the recording data stored in the portable device is transferred wirelessly from the charging stand to the portable device while wirelessly transmitted to the charging stand. It is suitably used for charging portable devices that wirelessly transmit recorded data.

DESCRIPTION OF SYMBOLS 10 ... Charging stand 11 ... Power transmission coil 12 ... AC power supply 13 ... Receiver 14 ... Communication circuit 15 ... Detection circuit 16 ... Timer 18 ... Sub-transmitter 19 ... Memory 30 ... Portable apparatus 31 ... Power receiving coil 32 ... Battery 33 ... Transmitter 34 ... Control circuit 35 ... Modulation circuit 36 ... Rectification circuit 37 ... Charge control circuit 38 ... Sub-receiver 39 ... Memory 41 ... Parallel capacitor 42 ... Switching element 43 ... Display means 44 ... Display unit 44A ... Light source 45 ... Lighting circuit 46 ... Timer 47 ... Capacitor 48 ... Diode 49 ... Power supply line 50 ... Personal computer 51 ... Microcomputer 52 ... Communication line 59 ... Memory

Claims (9)

The power receiving coil (31) of the portable device (30) containing the battery (32) and the memory (39) and the power transmitting coil (11) of the charging base (10) are electromagnetically coupled to carry from the charging base (10). Power is transferred to the device (30) by electromagnetic induction, and the battery (32) of the portable device (30) is charged.
A power transfer method for wirelessly transmitting recorded data in a memory (39) of the portable device (30) to a charging base (10) by wireless communication,
At the wireless transmission timing for wirelessly transmitting the recording data of the memory (39) from the portable device (30) to the charging stand (10), the power transfer from the charging stand (10) to the portable device (30) is interrupted, and the charging stand The power transfer timing for transferring power from (10) to the portable device (30) and the wireless transmission timing are alternately repeated to transfer power from the charging stand (10) to the portable device (30), and the portable device (30). Power transfer method for wirelessly transmitting recorded data of memory (39) from charging base to charging base (10).   The power transfer method according to claim 1, wherein the power transfer timing is interrupted by a timer (16) of a charging stand (10).   The power transfer method according to claim 1 or 2, wherein the wireless transmission timing is interrupted by a timer (46).   The power transfer method according to any one of claims 1 to 3, wherein a time width of the wireless transmission timing is 100 msec or less.   The power transfer method according to claim 1, wherein a time width of the wireless transmission timing is 10 msec or less.   The power transfer method according to claim 1 or 2, wherein the wireless transmission timing is interrupted by a data amount of recording data transmitted from the portable device (30) to the charging stand (10).   The mobile device (30) wirelessly transmits a power transfer start signal for starting power transfer timing to the charging stand (10), and the charging stand (10) detects the start signal for wireless transmission and starts the power transfer timing. The power transfer method according to claim 1.   A control signal for connecting the communication line (52) of the microcomputer (51) to the charging base (10) and controlling the power transfer timing from the microcomputer (51) to the charging base (10) via the communication line (52). Is transmitted, and the electric power conveyance method of any one of Claim 1 thru | or 7 which controls the electric power conveyance timing of a charging stand (10).   At the power transfer timing, the display means (43) of the portable device (30) indicates that the battery (32) is in a charged state, and at the wireless transmission timing, the battery (32) is in a charged state. The power transfer method according to any one of claims 1 to 8, wherein if there is, the display means (43) displays it.

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