WO2014087692A1 - 受電装置及び電子機器 - Google Patents
受電装置及び電子機器 Download PDFInfo
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- WO2014087692A1 WO2014087692A1 PCT/JP2013/067784 JP2013067784W WO2014087692A1 WO 2014087692 A1 WO2014087692 A1 WO 2014087692A1 JP 2013067784 W JP2013067784 W JP 2013067784W WO 2014087692 A1 WO2014087692 A1 WO 2014087692A1
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- Prior art keywords
- power receiving
- unit
- power
- switch
- receiving antenna
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- 238000004891 communication Methods 0.000 claims abstract description 105
- 230000007704 transition Effects 0.000 claims abstract description 20
- 230000005540 biological transmission Effects 0.000 description 31
- 230000004048 modification Effects 0.000 description 23
- 238000012986 modification Methods 0.000 description 23
- 230000002457 bidirectional effect Effects 0.000 description 7
- 238000010586 diagram Methods 0.000 description 7
- 230000007423 decrease Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000000470 constituent Substances 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
- H02J50/80—Circuit arrangements or systems for wireless supply or distribution of electric power involving the exchange of data, concerning supply or distribution of electric power, between transmitting devices and receiving devices
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
- H02J50/10—Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B5/00—Near-field transmission systems, e.g. inductive or capacitive transmission systems
- H04B5/70—Near-field transmission systems, e.g. inductive or capacitive transmission systems specially adapted for specific purposes
- H04B5/72—Near-field transmission systems, e.g. inductive or capacitive transmission systems specially adapted for specific purposes for local intradevice communication
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B5/00—Near-field transmission systems, e.g. inductive or capacitive transmission systems
- H04B5/70—Near-field transmission systems, e.g. inductive or capacitive transmission systems specially adapted for specific purposes
- H04B5/79—Near-field transmission systems, e.g. inductive or capacitive transmission systems specially adapted for specific purposes for data transfer in combination with power transfer
Definitions
- the present invention relates to a power receiving device and an electronic device that receive power without contact.
- a system for transmitting power in a non-contact manner includes a power transmission device and a power reception device.
- the power transmission device includes a control circuit and a power transmission antenna.
- the power transmission device communicates with the power reception device using the control circuit and the power transmission antenna, and transmits AC power to the power reception device.
- the control circuit controls a communication signal (hereinafter simply referred to as “signal”) when the power transmission device communicates with the power reception device.
- the control circuit controls power transmission of the power transmission device.
- the power receiving apparatus includes a power receiving antenna, a communication unit, a rectifier circuit, and a DC / DC converter. Moreover, the power receiving apparatus is connected to a load.
- the communication unit of the power receiving apparatus processes a signal transmitted from the power transmitting apparatus.
- the rectifier circuit converts the AC power received from the power transmission device into a DC voltage and outputs the DC voltage.
- the DC voltage output from the rectifier circuit is supplied to the load via the DC / DC converter.
- the power transmitting device and the power receiving device communicate with each other when power is transmitted as described above. Communication and power transmission can be performed using a pair of power transmission antennas and power reception antennas in a time division manner. In this case, the power receiving apparatus uses one power receiving antenna for both communication and power reception.
- Patent Document 1 discloses a power receiving device that communicates and receives power using a single power receiving antenna.
- the power receiving device of Patent Document 1 includes a secondary antenna (power receiving antenna), an RFID (communication unit) having a first rectifier circuit, a second rectifier circuit, and a functional unit (load) connected to the second rectifier circuit. And a bypass circuit.
- the first rectifier circuit and the second rectifier circuit are connected in series to the secondary antenna.
- the bypass circuit is connected in parallel with the first rectifier circuit.
- the bypass circuit adjusts the ratio of the current flowing through the first rectifier circuit and the current flowing through the second rectifier circuit. For this reason, large power can be supplied to the functional unit without being limited by the endurance voltage of the RFID. In other words, the RFID can be protected even when large power is supplied to the functional unit.
- a communication unit for performing communication and a rectifier circuit for supplying power to a load are connected in series.
- the communication unit and the rectifier circuit may be connected to the power receiving antenna in parallel.
- the power receiving antenna configured as described above may receive power exceeding the endurance voltage of the communication unit, as in Patent Document 1. For this reason, it is necessary to protect a communication part by a method different from Patent Document 1. Specifically, when the power receiving device is receiving power, the communication unit needs to be electrically disconnected. On the other hand, when the power receiving device is not receiving power, the communication unit needs to be able to communicate.
- the rectifier circuit outputs DC voltage not only during power reception but also during communication.
- the output voltage at the time of power reception by the rectifier circuit is higher than the output voltage at the time of communication. Therefore, in many cases, it can be determined whether or not the power receiving device is receiving power based on the output voltage of the rectifier circuit.
- the output voltage during power reception of the rectifier circuit and the output voltage during communication are substantially the same.
- the difference between the output voltage during power reception and the output voltage during communication is 1 V or less.
- the output voltage during communication of the rectifier circuit may be higher than the output voltage during power reception. In such a case, it is difficult to determine whether the power receiving device is receiving power based on the output voltage of the rectifier circuit.
- the present invention provides a power receiving device that can determine whether or not the power receiving device is receiving power even when the output voltage during communication of the rectifier circuit is the same as or larger than the output voltage during power reception.
- the purpose is to provide.
- One aspect (first aspect) of the present invention provides a power receiving device including a power receiving antenna, a rectifier circuit, a communication unit, a switch unit, and a switch control unit.
- the power receiving antenna is used for both communication and power reception.
- the rectifier circuit is connected to the power receiving antenna.
- the rectifier circuit converts the power received by the power receiving antenna into a DC voltage, outputs the direct current voltage, and supplies it to a load.
- the communication unit communicates via the power receiving antenna.
- the switch unit is connected between the power receiving antenna and the communication unit.
- the switch unit can transition between a conduction state in which the communication unit is electrically connected to the power receiving antenna and a cut-off state in which the communication unit is electrically disconnected from the power receiving antenna.
- the switch control unit is connected to the rectifier circuit.
- the switch control unit causes the switch unit to transition to the cutoff state when the power receiving antenna starts to receive power and the DC voltage output from the rectifier circuit exceeds a first threshold value.
- the switch control unit causes the switch unit to transition to the conductive state when the DC voltage falls below a second threshold value that is different from the first threshold value.
- Another aspect (second aspect) of the present invention provides an electronic device including the power receiving device according to the first aspect and a load.
- the DC voltage output from the rectifier circuit of the power receiving device is supplied to the load.
- the communication unit when the DC voltage output from the rectifier circuit exceeds the first threshold value, the communication unit is cut off, so that power exceeding the endurance voltage of the communication unit can be received.
- the communication unit when the DC voltage falls below a second threshold value different from the first threshold value, the communication unit becomes conductive and communication is possible.
- whether or not the power receiving apparatus is receiving power can be determined based on the first threshold value and the second threshold value. For this reason, even when the output voltage at the time of communication of the rectifier circuit is the same as or larger than the output voltage at the time of power reception, the power receiving device receives power by appropriately setting the first threshold value and the second threshold value. It can be determined whether or not.
- FIG. 6 is a circuit diagram illustrating a first modification of the switch unit in FIG. 2.
- FIG. 10 is a circuit diagram illustrating a third modification of the switch unit in FIG. 2.
- FIG. 10 is a circuit diagram illustrating a fourth modification of the switch unit in FIG. 2.
- It is a block diagram which shows the power receiving apparatus and power transmission apparatus by the modification of embodiment of this invention.
- the power reception device 20 can communicate with the power transmission device 10 and can receive power from the power transmission device 10.
- the power transmission device 10 includes a primary side control unit 11 and a power transmission antenna 12.
- the power transmission device 10 uses the power transmission antenna 12 to communicate with the power reception device 20 and supply power to the power reception device 20.
- the power receiving device 20 includes a power receiving antenna 21, a rectifier circuit 22, a switch control unit 23, a DC / DC converter 24, a switch unit 26, and a communication unit 27.
- the power receiving device 20 according to the present embodiment is connected to a load 25 outside the power receiving device 20.
- the power receiving device 20 is incorporated in an electronic device (not shown) provided with the load 25.
- the power receiving device 20 may include a load 25 as one of its constituent elements.
- the power receiving device 20 uses the power receiving antenna 21 to communicate with the power transmitting device 10 and receive power from the power transmitting device 10.
- the power receiving device 20 can take at least two states: a communication state in communication with the power transmission device 10 and a power reception state in which power is being received from the power transmission device 10.
- the power receiving device 20 can take a standby state that is neither a communication state nor a power receiving state.
- the power receiving antenna 21 is used for both communication and power reception. Specifically, the power receiving antenna 21 is connected to the communication unit 27 via the switch unit 26. The power receiving antenna 21 transmits the signal received from the power transmission antenna 12 to the communication unit 27, and transmits the signal transmitted from the communication unit 27 to the power transmission antenna 12. In other words, the communication unit 27 communicates with the primary side control unit 11 via the power receiving antenna 21 and the power transmission antenna 12. The power receiving antenna 21 is also connected to the rectifier circuit 22. The power receiving antenna 21 receives the power transmitted from the power transmitting device 10 as AC power by magnetic coupling with the power transmitting antenna 12, and supplies it to the rectifier circuit 22.
- the rectifier circuit 22 is connected to a DC / DC converter 24.
- the rectifier circuit 22 rectifies (ie, converts) the AC power supplied from the power receiving antenna 21 to a DC voltage and outputs the DC voltage, and supplies the output DC voltage to the DC / DC converter 24.
- the DC / DC converter 24 is connected between the rectifier circuit 22 and the load 25.
- the DC / DC converter 24 converts the voltage value of the DC voltage supplied from the rectifier circuit 22 and supplies the converted DC voltage to the load 25. That is, the DC voltage output from the rectifier circuit 22 is supplied to the load 25 via the DC / DC converter 24.
- the switch unit 26 is connected to the power receiving antenna 21 in parallel with the rectifier circuit 22. Specifically, the switch unit 26 is connected between the power receiving antenna 21 and the communication unit 27.
- the switch unit 26 is configured to be able to transition between two states, a conduction state and a cutoff state.
- the communication unit 27 is electrically connected to the power receiving antenna 21. For this reason, when the switch unit 26 is in a conductive state, the communication unit 27 can communicate with the power transmission device 10 (primary side control unit 11).
- the switch unit 26 is in the cut-off state, the communication unit 27 is electrically cut off from the power receiving antenna 21. For this reason, when the switch unit 26 is in the cut-off state, the communication unit 27 is protected from the overvoltage even when an overvoltage occurs between the power receiving antenna 21 and the rectifier circuit 22 in the power receiving state.
- the switch control unit 23 is connected to the rectifier circuit 22 in parallel with the DC / DC converter 24.
- the switch control unit 23 has a hysteresis circuit 28.
- the switch control unit 23 controls the switch unit 26 using the hysteresis circuit 28 according to the voltage value (output voltage) of the DC voltage output from the rectifier circuit 22.
- the hysteresis circuit 28 of the switch control unit 23 causes the switch unit 26 to transition from the cut-off state to the conduction state when the output voltage variation satisfies a predetermined condition, and the output voltage variation satisfies another predetermined condition.
- the switch unit 26 is changed from the conductive state to the cut-off state.
- the power receiving device 20 (communication unit 27) is placed in an area where it can communicate with the power transmission device 10 (primary side control unit 11), authentication by ID (Identifier) is performed between the primary side control unit 11 and the communication unit 27. Done. At this time, the switch control unit 23 makes the switch unit 26 conductive. Further, the power receiving device 20 is in a communication state.
- the primary control unit 11 starts transmitting power to the power receiving device 20.
- the transmitted power is received by the power receiving antenna 21 and rectified by the rectifier circuit 22.
- the switch control unit 23 controls the switch unit 26 according to the output voltage of the rectifier circuit 22 as described below.
- the DC / DC converter 24 does not operate before the power receiving antenna 21 starts to receive power, and has a high input impedance. For this reason, the output voltage of the rectifier circuit 22 temporarily rises immediately after the start of power reception until the DC / DC converter 24 operates.
- the switch control unit 23 (hysteresis circuit 28) causes the switch unit 26 to transition to the cutoff state. That is, when the output voltage of the rectifier circuit 22 reaches the first threshold, the switch control unit 23 (hysteresis circuit 28) detects that the power receiving device 20 has transitioned from the communication state to the power receiving state, and shuts off the switch unit 26. Transition to a state.
- the communication unit 27 is electrically disconnected from the power receiving antenna 21 and protected.
- the DC / DC converter 24 operates after the power receiving antenna 21 starts receiving power until the output voltage of the rectifier circuit 22 reaches the first threshold value. Not done. According to the present embodiment, since the DC / DC converter 24 configured as described above is provided, the communication unit 27 can be more reliably protected.
- the input impedance of the DC / DC converter 24 decreases. For this reason, the temporarily increased output voltage of the rectifier circuit 22 also decreases. The lowered output voltage is supplied to the load 25 via the DC / DC converter 24.
- the output voltage of the rectifier circuit 22 reaches the supply value smaller than the maximum value through the maximum value.
- the output voltage that has reached the supply value is supplied to the load 25 via the DC / DC converter 24.
- the first threshold value may be set to be larger than the above supply value and smaller than the maximum value.
- the Primary side control unit 11 stops transmitting power after transmitting power for a predetermined time. At this time, the output voltage of the rectifier circuit 22 falls from the supply value to the ground level.
- the switch control unit 23 (hysteresis circuit 28) It is detected that the power receiving state has changed to the standby state, and the switch unit 26 is changed to the conductive state.
- the second threshold value may be a value that is 90% or less of the output voltage (that is, the supply value) of the rectifier circuit 22 when the DC / DC converter 24 is operating. That is, the second threshold value may be set to be smaller than the supply value.
- the switch control unit 23 detects the output voltage of the rectifier circuit 22.
- the switch control unit 23 causes the switch unit 26 to transition to a cut-off state (that is, cuts off the switch unit 26), whereby the power receiving device 20 causes the communication unit 27 to Can be received while protecting.
- the switch control unit 23 detects that the power reception is completed, and causes the switch unit 26 to transition to the conductive state (that is, the switch unit 26 is made conductive). And the protection of the communication unit 27 is released.
- the hysteresis control using the first threshold value and the second threshold value allows The switch unit 26 can be appropriately transitioned between the conduction state and the cutoff state.
- the switch unit 26 includes two line switch units 52, two ground switch units 54, and two input protection units 55.
- the two line switch units 52 are respectively provided on the two lines 59 that connect the power receiving antenna 21 and the communication unit 27.
- the line switch unit 52 is connected in series between the power receiving antenna 21 and the communication unit 27.
- the line switch unit 52 is composed of an Nch FET.
- the drain (D) of the FET constituting the line switch unit 52 is connected to one end of the coil of the power receiving antenna 21, the source (S) is connected to the communication unit 27, and the gate (G) is connected to the switch control unit 23. ing.
- Each of the two ground switch sections 54 is provided between the line 59 and the ground. Specifically, each of the ground switch units 54 is connected between a connection point between the line switch unit 52 and the communication unit 27 and the ground. Similarly to the line switch unit 52, the ground switch unit 54 is configured by an Nch FET. The drain (D) of the FET constituting the ground switch unit 54 is connected to the corresponding line 59, the source (S) is connected to the ground, and the gate (G) is connected to the switch control unit 23.
- Each of the two input protection units 55 is connected to the line 59 in parallel with the ground switch unit 54. That is, the input protection unit 55 is provided between the two lines 59 and the ground.
- Each of the input protection units 55 is composed of one Zener diode (ZD). The cathode of the Zener diode (ZD) is connected to the corresponding line 59, and the anode is connected to the ground.
- the switch unit 26 since the switch unit 26 according to the present embodiment is configured as described above, when the switch control unit 23 makes the line switch unit 52 conductive and shuts off the ground switch unit 54, the switch unit 26 transitions to a conductive state.
- the switch unit 26 that has transitioned to the conductive state electrically connects the power receiving antenna 21 and the communication unit 27.
- the switch unit 26 transitions to a cut-off state when the switch control unit 23 cuts off the line switch unit 52 and makes the ground switch unit 54 conductive.
- the switch unit 26 that has transitioned to the cut-off state short-circuits the connection unit with the communication unit 27 to the ground level, thereby reliably disconnecting the communication unit 27 from the power receiving antenna 21.
- the switch part 26 since the switch part 26 has the input protection part 55, when the switch part 26 changes from a conduction
- the switch unit 26 may have a configuration different from the above-described configuration as long as the power receiving antenna 21 and the communication unit 27 can be conducted and blocked by the control of the switch control unit 23.
- various modifications of the switch unit 26 will be described.
- the switch unit 26a includes one bidirectional switch unit 56, one ground switch unit 54, and one input protection. Part 55.
- the bidirectional switch unit 56 is provided instead of the line switch unit 52 (see FIG. 2), the bidirectional switch unit 56, the ground switch unit 54, and the input protection unit 55 are provided only on one of the two lines 59. Can do.
- the switch unit 26a since the switch unit 26a according to the first modification is configured as described above, when the switch control unit 23 turns on the bidirectional switch unit 56 and shuts off the ground switch unit 54, the switch unit 26a transitions to a conduction state. The switch unit 26a transitions to a cut-off state when the switch control unit 23 cuts off the bidirectional switch unit 56 and causes the ground switch unit 54 to conduct. Further, like the switch unit 26, the switch unit 26 a has an input protection function for protecting the communication unit 27.
- the switch unit 26 b according to the second modification of the switch unit 26 has one bidirectional switch unit 56 and one ground switch unit 54. . That is, the switch unit 26b is configured in the same manner as the switch unit 26a (see FIG. 3) except that the switch unit 26b does not have the input protection unit 55 (Zener diode (ZD)).
- the switch part 26b according to the second modification functions in the same manner as the switch part 26a except that it does not have an input protection function.
- the switch unit 26 c has two input protection units 55 c instead of the two input protection units 55.
- the switch portion 26 is configured similarly to the switch portion 26 (see FIG. 2).
- Each of the input protection units 55 c is connected to the line 59 in parallel with the ground switch unit 54.
- each of the input protection units 55c is composed of one diode.
- the anode of the diode is connected to the corresponding line 59 and the cathode is connected to ground. For this reason, when a voltage equal to or higher than the forward voltage (Vf) of the diode is applied to the line 59, the diode becomes conductive, thereby protecting the communication unit 27.
- the input protection function can be provided by components other than the Zener diode (ZD).
- the switch part 26d according to the fourth modification of the switch part 26 (see FIG. 2) has an input protection part 55d slightly different from the input protection part 55c.
- the configuration is the same as the portion 26c (see FIG. 5). More specifically, each of the input protection units 55d is composed of a plurality of diodes connected in series. For this reason, two of the diodes are located at both ends of the input protection unit 55d. The anode of the diode located at one end of the input protection portion 55d is connected to the line 59. The cathode of the diode located at the other end of the end portion of the input protection portion 55d is connected to the ground.
- the voltage calculated by the forward voltage (Vf) of the diode ⁇ the number of diodes (series number) is the operating voltage of the input protection unit 55d.
- the input protection unit 55d may be composed of a plurality of different diodes. In this case, the voltage calculated by summing the forward voltages (Vf) of the respective diodes becomes the operating voltage of the input protection unit 55d.
- the operating voltage of the input protection unit 55d can be set more appropriately. When a voltage equal to or higher than the operating voltage set as described above is applied to the line 59, a current flows through the input protection unit 55d, and the communication unit 27 is protected.
- the power receiving device 20 according to the present embodiment can be variously modified in addition to the modified examples described above.
- a power receiving device 20x is configured to be substantially the same as the power receiving device 20 (see FIG. 1), but slightly different. More specifically, the power reception device 20x is configured in the same manner as the power reception device 20 except that the power reception device 20x includes a switch unit 26x that is not included in the power reception device 20 and a control signal path 29.
- the switch unit 26 x is provided between the rectifier circuit 22 and the DC / DC converter 24.
- the control signal path 29 is a path for the communication unit 27 to transmit a control signal to the switch control unit 23.
- the switch control unit 23 of the power reception device 20x performs slightly different control from the switch control unit 23 of the power reception device 20 (see FIG. 1).
- the power receiving device 20x may perform communication from the power receiving device 20x, such as communication with another IC card or IC tag.
- the power receiving device 20x functions as a reader / writer
- the power transmitting device 10 functions as a communication partner such as an IC card or an IC tag.
- a communication signal (signal) is transmitted from the power receiving antenna 21.
- the output voltage (reception voltage value) of the rectifier circuit 22 generated when the power receiving antenna 21 receives a signal is smaller than the output voltage (power supply value) of the rectifier circuit 22 in the power receiving state. For this reason, the reception voltage value does not exceed the first threshold value.
- the output voltage of the rectifier circuit 22 that is generated when a signal is transmitted from the power receiving antenna 21 may exceed the first threshold value.
- the switch unit 26 when the output voltage of the rectifier circuit 22 exceeds the first threshold while the power receiving device 20x is transmitting to the power transmitting device 10, the switch unit 26 is cut off. For this reason, a signal cannot be transmitted from the power receiving antenna 21.
- the switch control unit 23 (hysteresis circuit 28) of the power receiving device 20x according to the present modification controls the switch unit 26 by using the third threshold in addition to the first threshold and the second threshold.
- the communication unit 27 transmits a control signal to the switch control unit 23 via the control signal path 29 only when transmitting from the power receiving device 20 x to the power transmission device 10.
- the communication unit 27 notifies the switch control unit 23 that it is transmitting via the power receiving antenna 21 by the control signal.
- the switch control unit 23 controls the switch unit 26 using the third threshold value instead of the first threshold value.
- the switch control unit 23 when the switch control unit 23 according to the modified example does not receive a control signal from the communication unit 27, as in the present embodiment, when the output voltage of the rectifier circuit 22 exceeds the first threshold value, The switch unit 26 is changed to the cutoff state.
- the switch control unit 23 according to the modification when receiving the control signal from the communication unit 27, the switch control unit 23 according to the modification does not cause the switch unit 26 to transition to the cut-off state even if the output voltage of the rectifier circuit 22 exceeds the first threshold value. Exceeds a third threshold value that is greater than the first threshold value, the switch unit 26 is transitioned to a cut-off state.
- the third threshold value may be a value between the upper limit value of the endurance voltage of the communication unit 27 and the upper limit value of the output voltage of the rectifier circuit 22 when the power receiving device 20x transmits to the power transmission device 10. Since the switch control unit 23 controls the switch unit 26 using the third threshold value set in this way, the switch unit 26 is shut off while the power receiving device 20x is transmitting to the power transmission device 10. Can be prevented.
- the power receiving device 20x has various functions using the switch unit 26x.
- the output voltage is generated from the rectifier circuit 22 also when the power receiving device 20x and the power transmitting device 10 communicate with each other.
- the generated output voltage is supplied to the load 25 via the DC / DC converter 24. That is, part of the power for transmitting and receiving signals is consumed by the load 25. For this reason, there is a possibility that a sufficient communication signal level cannot be secured.
- the switch unit 26x can be cut off only when the power receiving device 20x is in a communication state. Thereby, it is possible to prevent the power for transmitting and receiving signals from being consumed by the load 25.
- the power supplied to the load 25 can be modulated by opening and closing the switch unit 26x in the power receiving state. That is, when the power receiving antenna 21 receives power, the power receiving antenna 21 can be used to perform communication by load modulation.
- the switch control unit 23 may control the switch unit 26 using the first threshold value.
- the switch control unit 23 uses the third threshold value instead of the first threshold value, The switch unit 26 may be controlled.
- the communication unit 27 can be more reliably protected by the switch unit 26x.
- the power receiving device 20 according to the present embodiment and the power receiving device 20x according to the modification include the DC / DC converter 24 (see FIGS. 1 and 7).
- the DC / DC converter 24 since the DC / DC converter 24 does not operate until the output voltage of the rectifier circuit 22 reaches the first threshold after the power receiving antenna 21 starts to receive power, the DC / DC converter 24 maintains a high input impedance. However, it may be difficult to provide the DC / DC converter 24 configured in this way. In some cases, the DC / DC converter 24 may operate before the output voltage of the rectifier circuit 22 reaches the first threshold value.
- a high input impedance can be intentionally obtained by the switch unit 26x.
- the switch unit 26x may be cut off after the power receiving antenna 21 starts receiving power until the output voltage of the rectifier circuit 22 reaches the first threshold value. Further, when the output voltage of the rectifier circuit 22 exceeds the first threshold, the switch unit 26x may be made conductive.
- the communication unit 27 can be more reliably protected. Further, the communication unit 27 can be protected without providing the DC / DC converter 24.
- the present invention can be applied to electronic devices such as mobile phones and digital cameras having a mechanism for non-contact charging. Furthermore, the present invention can be applied to a system including an electronic device.
- the present invention is based on Japanese Patent Application No. 2012-266851 filed with the Japan Patent Office on December 6, 2012, the contents of which are incorporated herein by reference.
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Power Engineering (AREA)
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- Charge And Discharge Circuits For Batteries Or The Like (AREA)
- Near-Field Transmission Systems (AREA)
Abstract
Description
11 一次側制御部
12 送電アンテナ
20,20x 受電装置
21 受電アンテナ
22 整流回路
23 スイッチ制御部
24 DC/DCコンバータ
25 負荷
26,26a,26b,26c,26d,26x スイッチ部
27 通信部
28 ヒステリシス回路
29 制御信号経路
52 ラインスイッチ部
54 グランドスイッチ部
55、55c、55d 入力保護部
56 双方向スイッチ部
59 ライン
D ドレイン
G ゲート
S ソース
ZD ツェナーダイオード
Claims (10)
- 通信と受電との双方に使用される受電アンテナと、
前記受電アンテナに接続された整流回路であって、前記受電アンテナが受電した電力を直流電圧に変換して出力し、負荷に供給する整流回路と、
前記受電アンテナを介して通信する通信部と、
前記受電アンテナと前記通信部との間に接続されたスイッチ部であって、前記通信部が前記受電アンテナと電気的に接続される導通状態と、前記通信部が前記受電アンテナから電気的に遮断される遮断状態との間を遷移可能なスイッチ部と、
前記整流回路に接続されたスイッチ制御部であって、前記受電アンテナが受電を開始して前記整流回路から出力された前記直流電圧が第1の閾値を上回ると前記スイッチ部を前記遮断状態に遷移させる一方、前記直流電圧が前記第1の閾値と異なる第2の閾値を下回ると前記スイッチ部を前記導通状態に遷移させるスイッチ制御部とを備える
受電装置。 - 請求項1記載の受電装置であって、
前記受電アンテナが受電を開始すると前記整流回路から出力される前記直流電圧は、最大値を経て、前記最大値よりも小さな供給値に達し、
前記第1の閾値は、前記供給値よりも大きく且つ前記最大値よりも小さい
受電装置。 - 請求項2記載の受電装置であって、
前記第2の閾値は、前記供給値よりも小さい
受電装置。 - 請求項1乃至請求項3のいずれかに記載の受電装置であって、
前記スイッチ制御部は、前記通信部が前記受電アンテナを介して送信しているときには、前記整流回路から出力された前記直流電圧が前記第1の閾値を上回っても前記スイッチ部を前記遮断状態に遷移させず、前記直流電圧が前記第1の閾値よりも大きな第3の閾値を上回ると前記スイッチ部を前記遮断状態に遷移させる
受電装置。 - 請求項4記載の受電装置であって、
前記通信部は、前記受電アンテナを介して送信していることを、制御信号によって前記スイッチ制御部に通知する
受電装置。 - 請求項1乃至請求項5のいずれかに記載の受電装置であって、
前記受電アンテナを使用して負荷変調による通信を行うように構成されており、
前記スイッチ制御部は、前記負荷変調による通信を行っているときには、前記直流電圧が前記第1の閾値を上回ると前記スイッチ部を前記遮断状態に遷移させる
受電装置。 - 請求項1乃至請求項6のいずれかに記載の受電装置であって、
前記整流回路と前記負荷との間に接続されたDC/DCコンバータを更に備えている
受電装置。 - 請求項1乃至請求項7のいずれかに記載の受電装置であって、
前記スイッチ部は、ラインスイッチ部とグランドスイッチ部とを有しており、
前記ラインスイッチ部は、前記受電アンテナと前記通信部との間に直列に接続されており、
前記グランドスイッチ部は、前記受電アンテナと前記通信部との間の接続点と、グランドとの間に接続されている
受電装置。 - 請求項8記載の受電装置であって、
前記ラインスイッチ部及び前記グランドスイッチ部の夫々は、NchのFETから構成されている
受電装置。 - 請求項1乃至請求項9のいずれかに記載の受電装置と、前記受電装置の前記整流回路から出力された前記直流電圧が供給される負荷とを備える電子機器。
Priority Applications (3)
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KR1020147014254A KR20150091222A (ko) | 2012-12-06 | 2013-06-28 | 수전 장치 및 전자기기 |
US14/371,141 US9837858B2 (en) | 2012-12-06 | 2013-06-28 | Power reception device and electronic apparatus |
US15/703,183 US20180006507A1 (en) | 2012-12-06 | 2017-09-13 | Power reception device and electronic apparatus |
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JP2012266851A JP6073663B2 (ja) | 2012-02-24 | 2012-12-06 | 受電装置及び電子機器 |
JP2012-266851 | 2012-12-06 |
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US14/371,141 A-371-Of-International US9837858B2 (en) | 2012-12-06 | 2013-06-28 | Power reception device and electronic apparatus |
US15/703,183 Division US20180006507A1 (en) | 2012-12-06 | 2017-09-13 | Power reception device and electronic apparatus |
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WO2014087692A1 true WO2014087692A1 (ja) | 2014-06-12 |
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PCT/JP2013/067784 WO2014087692A1 (ja) | 2012-12-06 | 2013-06-28 | 受電装置及び電子機器 |
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US (2) | US9837858B2 (ja) |
JP (1) | JP6073663B2 (ja) |
KR (1) | KR20150091222A (ja) |
TW (1) | TW201424185A (ja) |
WO (1) | WO2014087692A1 (ja) |
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JP5308588B1 (ja) * | 2013-04-26 | 2013-10-09 | Necトーキン株式会社 | 受電装置及び電子機器 |
DE102013105291B4 (de) * | 2013-05-23 | 2017-12-07 | Infineon Technologies Ag | Chipkarte |
EP3202010B1 (en) | 2014-10-01 | 2020-02-12 | Humavox Ltd. | Combined rf charging and communication module and methods of use |
KR101678989B1 (ko) * | 2015-06-29 | 2016-11-25 | 주식회사 맵스 | 자기장을 이용하는 근거리 통신모듈 보호장치 및 그 휴대 단말 |
CN110546853A (zh) * | 2017-04-24 | 2019-12-06 | 三菱电机工程技术株式会社 | 谐振型电力接收装置 |
JP7187135B2 (ja) * | 2017-05-16 | 2022-12-12 | ラピスセミコンダクタ株式会社 | 無線受電装置、無線給電装置、無線電力伝送システム、及び無線受電装置の過大磁界保護方法 |
KR20210146571A (ko) * | 2020-05-27 | 2021-12-06 | 삼성전자주식회사 | 무선으로 전력을 수신하는 전자 장치 및 그 동작 방법 |
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WO2012090904A1 (ja) * | 2010-12-27 | 2012-07-05 | Necトーキン株式会社 | 電子機器、モジュール及びシステム |
JP2012196031A (ja) * | 2011-03-16 | 2012-10-11 | Hitachi Consumer Electronics Co Ltd | 非接触電力伝送システム、受電装置、及び送電装置 |
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- 2012-12-06 JP JP2012266851A patent/JP6073663B2/ja not_active Expired - Fee Related
-
2013
- 2013-06-28 KR KR1020147014254A patent/KR20150091222A/ko not_active Application Discontinuation
- 2013-06-28 WO PCT/JP2013/067784 patent/WO2014087692A1/ja active Application Filing
- 2013-06-28 US US14/371,141 patent/US9837858B2/en not_active Expired - Fee Related
- 2013-07-10 TW TW102124743A patent/TW201424185A/zh unknown
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2017
- 2017-09-13 US US15/703,183 patent/US20180006507A1/en not_active Abandoned
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WO2012090904A1 (ja) * | 2010-12-27 | 2012-07-05 | Necトーキン株式会社 | 電子機器、モジュール及びシステム |
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JP6073663B2 (ja) | 2017-02-01 |
US9837858B2 (en) | 2017-12-05 |
JP2013201881A (ja) | 2013-10-03 |
US20150042170A1 (en) | 2015-02-12 |
KR20150091222A (ko) | 2015-08-10 |
TW201424185A (zh) | 2014-06-16 |
US20180006507A1 (en) | 2018-01-04 |
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