JP2015080337A - Non-contact power supply method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a non-contact power supply method having a novel method of notification from a charge cradle indicating the states of the charge cradle and equipment with a built-in battery.SOLUTION: A control unit (53) in equipment (50A) with a built-in battery, on detecting the full charge of a battery (52), transmits to the charge cradle (10A) a signal to suspend charging and continue power supply to the equipment (50A) with a built-in battery, and also issues a notification of the full charge. Meanwhile, the charge cradle (10A) issues a notification of the suspension of charging and the continuation of power supply to the equipment (50A) with a built-in battery.

Description

  The present invention relates to a contactless power feeding method.

  As a conventional contactless charging method, the following patent document has the following disclosure. The battery built-in device is placed on the charging stand, the power transmission coil and the power receiving coil are electromagnetically coupled, power is transmitted from the charging stand to the battery built-in device, and the built-in battery of the battery built-in device is charged. When the battery built-in device to which the internal battery is charged detects that the built-in battery is fully charged, it stops charging and transmits a full charge signal to the charging stand. The charging stand detects a full charge signal, stops power transfer from the power transmission coil 11, and stops charging. The charging stand changes the light emission state of the LED as the light source in various ways, and displays the charging state and the like of the built-in battery 52 (charging state, fully charged state).

WO2012 / 141080

  The above charging stand can display the charging state of the built-in battery of the battery built-in device (charging state, fully charged state).

  An object of the present invention is to provide a contactless power feeding method including a new charging stand and a notification method from the charging stand indicating the state of the battery built-in device.

  In the charging method of the present invention, the battery built-in device 50A including the power receiving coil 51 is set in the charging base 10A including the power transmitting coil 11, and the power receiving coil 51 of the battery built-in device 50A is set in the power transmitting coil 11 of the charging base 10A. Electromagnetically coupled, power is transferred from the power transmission coil 11 to the power receiving coil 51 by electromagnetic induction, and the battery 52 of the battery built-in device 50A is charged with power supplied from the charging base 10A to the battery built-in device 50A. When the control unit 53 in the battery built-in device 50A detects full charge of the battery 52, the charging is stopped, and a signal for continuing to supply power to the battery built-in device 50A is transmitted to the charging base 10A, and the battery The control unit 53 in the built-in device 50A notifies the full charge, and in the charging stand 10A, the battery built-in device (50A) notifies the charging stop and the power supply continuation notification.

  For example, in the comparative example, there are the following methods. In the charging stand and battery built-in device, since the battery built-in device is fully charged, the battery built-in device displays a full charge, but since the power transmission is continued, the charge state is displayed. Will be. Here, there is a possibility that the user may be confused, concerned about overcharge, or anxious because the power transmission and charging are not stopped even though the battery built-in device is fully charged.

  In the present invention, the battery built-in device 50A is fully charged, and the notification (display) of the charging stand 10A when the power transmission of the charging stand 10A is stopped, and the battery built-in device 50A is fully charged, but driving to this is performed. Since the notification (display) of the charging stand 10A when the power is continued is made different, the above-described confusion, overcharge concerns and anxiety are not given to the user.

It is a block diagram of the electric power feeding stand and portable apparatus which carry electric power with the non-contact electric power feeding method concerning the Example of this invention. It is a flow of the Example of this invention.

  Embodiments of the present invention will be described below with reference to the drawings. However, the embodiment described below exemplifies a contactless power feeding method for embodying the technical idea of the present invention, and the present invention does not specify the contactless power feeding method as the following method or circuit configuration. Further, in this specification, in order to facilitate understanding of the scope of claims, numbers corresponding to the members shown in the examples are indicated in the “claims” and “means for solving problems” sections. It is added to the members. However, the members shown in the claims are not limited to the members in the embodiments.

  FIG. 1 is a block diagram showing a power supply stand and a portable device that carry power by the contactless power supply method of the present invention. This figure shows a state in which the mobile device 50 is placed on the power supply base 10 and power is supplied from the power supply base 10 to the mobile device 50. In the following embodiments, the power supply base 10 is the charging base 10A, the portable device 50 is the battery built-in device 50A, and the battery 52 of the battery built-in device 50A is charged by supplying power from the charging base 10A to the battery built-in device 50A. Show.

  The portable device 50 in FIG. 1 is a battery built-in device 50A, and this portable device 50 incorporates a power receiving coil 51 that is electromagnetically coupled to the power transmitting coil 11 of the power supply base 10. The battery 52 is charged with the received power induced by the power receiving coil 51. Therefore, the portable device 50 of FIG. 1 uses a battery 52, a power receiving coil 51, a rectifier circuit 56 that converts alternating current induced in the power receiving coil 51 into direct current, and a direct current output from the rectifier circuit 56. Charge. A current detection circuit 57 that detects a charging current of the battery 52 and a control unit 53 including a microcomputer to which a detection current value detected by the current detection circuit 57, a battery voltage value, and the like are input.

  The control unit 53 includes a transmission circuit 54 that transmits battery information such as an input current value and battery voltage value to the power supply base 10 so as to be transmitted as binary information. Further, the control unit 53 detects the current value and the battery voltage value, and if the battery 52 is a lithium ion battery, these values are constant voltage and constant current charging regulated to the maximum voltage value and the maximum current value. An increase / decrease request signal is output from the transmission circuit 54 so that

  The control unit 53 also controls a switch 58 that stops charging the battery 52 when full charge is detected, and controls a switch 59 that controls battery charging and power supply to a load L described later. .

  In FIG. 1, a portable device 50 is used as a battery built-in device 50 </ b> A, and the battery 52 is charged with received power and the load L of the portable device 50 (for example, a smartphone or a tablet personal computer) is driven.

  The control unit 53 detects the full charge of the battery 52 and transmits a full charge signal to the power supply base 10 via the transmission circuit 54. The power supply base 10 detects the full charge signal transmitted from the transmission circuit 54 by the reception circuit 14. When the full charge signal is detected, the primary side control unit 13 including the microcomputer discriminates the binary signal from the receiving circuit 14 and controls the AC power source 12 to stop the power supply to the power transmission coil 11. .

The transmission circuit 54 sends an increase request signal and a decrease request signal for increasing or decreasing the output of the power supply base 10 from the portable device 50 to the power supply base 10, a charging current of the battery 52, a voltage of the battery 52, a full charge of the battery 52. Various transmission signals such as a signal and an ID signal are transmitted. The transmission circuit 54 changes various load impedances of the power reception coil 51 and transmits various transmission signals to the power transmission coil 11.
Although not shown, the transmission circuit 54 has a modulation circuit connected to the power receiving coil 51. The modulation circuit connects a load such as a capacitor or a resistor and a switching element in series, and controls on / off of the switching element to transmit various transmission signals to the power supply base 10.

  The receiving circuit 14 of the power supply base 10 detects a transmission signal transmitted from the transmission circuit 54 by detecting an impedance change, a voltage change, a current change and the like of the power transmission coil 11. When the load impedance of the power receiving coil 51 changes, the impedance, voltage, or current of the power transmitting coil 11 that is electromagnetically coupled to the power receiving coil 51 changes. Therefore, the receiving circuit 14 detects these changes and transmits the portable device 50. A signal can be detected.

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

  The current detection circuit 57 detects the charging current of the battery 52. The current detection circuit 57 shown in FIG. 2 includes a current detection resistor 57A connected in series with the battery 52, and a differential amplifier 57B that amplifies the voltage at both ends of the current detection resistor 57A. From the output, the charging current of the battery 52 is detected. The charging current of the battery 52 becomes an output of the rectifier circuit 56, that is, an output of power induced in the power receiving coil 51. Therefore, the charging current of the battery 52 can be detected by detecting the output current of the rectifier circuit 56, and can also be detected by detecting the output of the power receiving coil 51.

  In the power supply base 10, an upper surface plate 21 on which the portable device 50 is set and placed at a certain position is provided on the upper surface of the case 20, and the power transmission coil 11 is disposed inside the upper surface plate 21. The power transmission coil 11 is connected to an AC power supply 12 and controls the AC power supply 12 by a primary side control unit 13.

The primary side control unit 13 controls the AC power supply 12 with the increase / decrease request signal transmitted from the portable device 50 to adjust the power supplied to the power transmission coil 11. The primary side control unit 13 increases the power output to the power transmission coil 11 with the increase request signal input from the reception circuit 14, and decreases the output to the power transmission coil 11 with the decrease request signal, and requests from the portable device 50. The required power is supplied. That is, the maximum output of the AC power supply 12 is limited to the output power threshold.

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

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

  The power supply base 10 supplies AC power to the power transmission coil 11 with the AC power supply 12 in a state where the power transmission coil 11 is brought close to the power reception coil 51. The AC power of the power transmission coil 11 is conveyed to the power reception coil 51 and charges the battery 52. When the battery 52 is fully charged, the power supply base 10 stops the power supply to the power transmission coil 11 with the full charge signal transmitted from the portable device 50 and stops the charging of the battery 52.

  Specifically, when the battery 52 is a lithium ion battery, the charge control circuit 53 charges the battery 52 with a constant voltage and a constant current. For example, when charging is performed at a maximum voltage of 4.2 V based on battery information such as the voltage and current of the battery 52 of the portable device 50, the power supply base 10 has a predetermined constant current when the battery voltage is 4.2 V or less. The control circuit 13 controls the AC power supply 12 based on the increase / decrease request signal received by the receiving circuit 14 to adjust the output to the power transmission coil 11 (specifically, an output up request and an output down request are alternately issued. ) When the output to the power transmission coil 11 is adjusted and the battery voltage to be charged becomes 4.2V, the power supply base 10 uses the increase / decrease request signal received by the reception circuit 14 so that the battery voltage can be maintained at 4.2V. Based on this, the control circuit 13 controls the AC power supply 12 to adjust the output to the power transmission coil 11 (specifically, an output up request and an output down request are alternately issued).

  Further, the charging stand 10A includes a primary transmission circuit 15 having a structure similar to that of the transmission circuit 54 so that information can be transmitted. And the secondary side receiving circuit 55 of the structure similar to the said receiving circuit 14 is provided so that information can be received.

  The operation of the charging base 10A and the notification method in this embodiment will be described with reference to FIG. In step S1, the ID information is transmitted to the charging base 10A from the transmission circuit 54 of the battery built-in device 50A, and the primary side control unit 13 authenticates the ID information with the signal from the receiving circuit 14. Further, the ID information of the charging base 10A is transmitted from the primary side transmission circuit 15 of the charging base 10A to the battery built-in device 50A, and the control unit 53 uses the signal from the secondary side receiving circuit 54 to control the charging base 10A. Authenticate the ID information. Thereby, in step S1, it mutually authenticates.

  In step S <b> 2, charging is started, and charging base 10 </ b> A performs power transmission based on an increase / decrease request signal from control unit 53 and transmission circuit 54.

  During charging in step S3, notification (display) of the battery built-in device 40 is notified (displayed) that charging is in progress. Further, the charging stand 10A is notified (displayed) that charging is in progress.

  In step 4, the control unit 53 determines whether or not the battery 52 is fully charged. If not, the control unit 53 returns to step S2 to continue charging. If the battery is fully charged, in step 5, the controller 53 and the transmission circuit 54 transmit full charge information to the primary side.

  In step S6, the control unit 53 of the battery built-in device 40 detects that the battery 52 is fully charged and has stopped charging, but the battery built-in device 40 continues to drive (for example, the battery built-in device 40 (It is detected that power is continuously consumed even though it is small in the driving state), and a request signal for operating power is transmitted to the primary side, and transmission of power is continued from the primary side (step S6 ′, Step S7). Here, since the battery built-in device 40 is fully charged, a notification (display) of full charge or completion of charging is made. Further, the charging stand 10A notifies (displays) charging end and power transmission continuation.

As a comparative example, there is the following method. In the charging stand and battery built-in device, since the battery built-in device is fully charged, the battery built-in device displays a full charge, but since the power transmission is continued, the charge state is displayed. Will be. Here, there is a possibility that the user may be confused, concerned about overcharge, or anxious because the power transmission and charging are not stopped even though the battery built-in device is fully charged.

  In this embodiment, the battery built-in device 50A is fully charged, and the notification (display) of the charging stand 10A when power transmission of the charging stand 10A is stopped and the battery built-in device 50A are fully charged. Since the notification (display) of the charging stand 10A when driving power is continued is made different, the above-mentioned confusion, overcharge concerns and anxiety are not given to the user.

  The following can be adopted as the notification unit L1 and the battery built-in device 50A of the charging stand 10A. Information such as visual information, auditory information, tactile information, olfactory information, or a combination thereof can be notified. As the different display described above, it is possible to use flashing display of the charging lamp at different flashing intervals, lighting or flashing the charging lamps of different colors and positions, and the like.

  In addition, a display device such as a liquid crystal display, an organic EL display, or an LED can be used as a notification device. In addition, as a notification device, a notification device using voice information, sound, music or the like, a vibration pattern notification device using a vibration device or the like, a tactile notification device, a scent notification device, or the like can be used.

L ... Load L1 ... Notification unit 10 ... Power supply table 10A ... Charging table 11 ... Power transmission coil 12 ... AC power supply 13 ... Primary side control unit
DESCRIPTION OF SYMBOLS 14 ... Reception circuit 15 ... Primary side transmission circuit 16 ... Movement mechanism 20 ... Case 21 ... Top plate 22 ... Positioning part mechanism 23 ... Insertion recessed part 30 ... Foreign material 50 ... Portable apparatus 50A ... Battery built-in apparatus 51 ... Power receiving coil 52 ... Battery 53 ... Control unit Charging control circuit 54 ... Transmission circuit 55 ... Secondary side receiving circuit 56 ... Rectifier circuit 57 ... Current detection circuit 57A ... Current detection resistor
57B ... Differential amplifier L2 ... Notification unit 58 ... Switch 59 ... Switch

Claims (1)

A battery built-in device (50A) with a built-in power receiving coil (51) is set on a charging stand (10A) having a power transmitting coil (11), and the battery built-in device (11) is placed on the power transmitting coil (11) of the charging stand (10A). 50A) power receiving coil (51) is electromagnetically coupled, and power is transferred from the power transmitting coil (11) to the power receiving coil (51) by electromagnetic induction,
Charging the battery (52) of the battery built-in device (50A) with power supplied from the charging base (10A) to the battery built-in device (50A),
When the control unit (53) in the battery built-in device (50A) detects full charge of the battery (52), the charging is stopped, and a signal for continuing to supply power to the battery built-in device (50A) is sent to the charging stand ( 10A), and
The control unit (53) in the battery built-in device (50A) notifies the full charge,
In the charging stand (10A), the battery built-in device (50A) is a non-contact power feeding method for notifying charging stop and power feeding continuation notification.