Source: https://patents.google.com/patent/CN104604077B/en
Timestamp: 2019-12-07 13:00:52
Document Index: 183763848

Matched Legal Cases: ['art 110', 'art 101', 'art 101', 'art 101', 'art 101', 'art 101', 'art 101', 'art 101', 'art 110', 'art 101', 'art 101', 'arts 1', 'art 210', 'art 210', 'art 110', 'art 614', 'arts 614', 'art 620', 'art\n102', 'art\n111']

CN104604077B - Non-contact charging device and the contactless power supply system for using the non-contact charging device - Google Patents
Non-contact charging device and the contactless power supply system for using the non-contact charging device Download PDF
CN104604077B
CN104604077B CN201380046156.7A CN201380046156A CN104604077B CN 104604077 B CN104604077 B CN 104604077B CN 201380046156 A CN201380046156 A CN 201380046156A CN 104604077 B CN104604077 B CN 104604077B
CN201380046156.7A
CN104604077A (en
市川胜英
2012-09-05 Priority to JP2012-194812 priority Critical
2012-09-05 Priority to JP2012194812 priority
2013-06-19 Application filed by 瑞萨电子株式会社 filed Critical 瑞萨电子株式会社
2013-06-19 Priority to PCT/JP2013/066824 priority patent/WO2014038265A1/en
2015-05-06 Publication of CN104604077A publication Critical patent/CN104604077A/en
2018-10-19 Publication of CN104604077B publication Critical patent/CN104604077B/en
Big charged area and communication zone are ensured in the contactless power supply system with wireless communication.The present invention has resonance coil, radio antenna coil, power supply coil and the sensitivity adjustment circuit being connected with power supply coil, when providing electric power in a non contact fashion, power supply coil is set to carry out electromagnetic coupling with resonance coil, in the way of magnetic resonance electric power is provided from resonance coil, in wireless communication, so that radio antenna coil is coupled with resonance coil, the raising of sensitivity is sought by sensitivity adjustment circuit.
Non-contact charging device and the non-contact power for using the non-contact charging device System
The present invention relates to non-contact charging devices, such as relate to be applied to equipped with contactless IC card and battery Portable device provides the non-contact charging device of data communication and power supply and is filled with portable device and non-contact charge The technology for the contactless power supply system set.
As contactless power supply system, such as such system recorded in a kind of Fig. 1 of known patent document 1.First, exist When studying the system recorded in the patent document 1, present inventor has produced research according to Fig. 1 of patent document 1 Figure.The figure for the research produced is Fig. 7.Hereinafter, illustrating contactless power supply system using the Fig. 7.
Contactless power supply system shown in Fig. 7 includes the power transmission dress for being set to the electricity suppliers side such as railway station, shop Set 701 and the portable electronic device 702 held of user.In a non-contact manner using power transmission device 701 to being set to The fast high-capacity power storage module 720 of portable electronic device 702 charges.Therefore, power transmission device 701 is also regarded as non-connect Touch charging unit.
Power transmission device 701 includes NFC (Near Field Communication：Near-field communication) non-contact types such as reader Processing module 713, non-contact type power transmission module 712 and power transmission control module 711.Portable electronic device is (following to be also known as Mobile terminal device or portable terminal) 702 include non-contact processing mould for non-contact processing operations such as NFC Block 723, for the non-contact type power transmission module 722 of charging, the power transmission control module 721 of the judgement and control charged and It is capable of the large capacity power storage module 720 of quick charge.
The user for possessing portable terminal 702 makes portable terminal 702 close to the power transmission dress for being set to station, shop etc. 701 are set, e-payment etc. is thus carried out.By making portable terminal 702 close to power transmission device 701, it is being equipped on power transmission device Into line number between 701 non-contact processing module 713 and the non-contact processing module 723 for being equipped on portable terminal 702 According to transmission (certification and read-write etc.), to implement e-payment etc..On the other hand, by making portable terminal 702 close to power transmission Device 701, from the non-contact type power transmission module 712 of power transmission device 701 is equipped in a non-contact manner to portable terminal end side Non-contact type power transmission module 722 transmit electric power.Non-contact type power transmission module 722 carries out rectification to the electric power received and to fast Fast large capacity power storage module 720 charges.711,721 pairs of the power transmission control module of the figure is between these modules with non-contact The power transmission that carries out of mode controlled, and carry out the charging control for charging to fast high-capacity power storage module 720 System.
In the system in fig. 7, right during carrying out data transmission (communication) between non-contact processing module 713,723 The power supply (fast high-capacity power storage module 720) of portable terminal 702 charges, therefore can reduce portable terminal 702 Charging time.In particular, if continually being communicated between non-contact processing module 713,723, even if not right Portable terminal 702, which is charged, also can continue to using terminal.
Show to implement Fig. 7 in several cm closer distances below at a distance from power transmission device 701 is between portable terminal 702 What is gone out is communicated, based on non-contacting for the power transmission of charging.Transmission in this short distance be typically based on electromagnetic induction method, The transmission that the magnetic couplings such as magnetic resonance mode (electromagnetic coupling) carry out.This is because, for example considering the transmission based on electric wave In the case of, in the transmission based on electric wave, transmission power penalties are inversely proportional with distance r, in contrast, the biography based on electromagnetic coupling Defeated power penalties and transmission range r's square is inversely proportional.Thus, for example in the case where transmission range is less than 1m, 1/ (r2) Item is more than 1/r, therefore the more close then transmission based on electromagnetic coupling of transmission range is more advantageous.
It is used in based on non-contacting communication, for the frequency usage 100kHz to more than ten MHz or so in the power transmission of charging Frequency.As the antenna for these conveyings and in receiving, in order to reinforce magnetic couplings, efficiency of transmission is improved, it is usually used The antenna for the coiled type that several circles enclose left and right to tens, as contactless communication, the base used in the portable terminal shown in Fig. 7 The antenna as non-contacting power transmission uses the day of the small-size line round of the diameter 4cm that can be built in terminal shell or so Line (referring for example to non-patent literature 1).
Patent document 1：Japanese Unexamined Patent Publication 2006-353042 bulletins
Non-patent literature 1：Day Longitude エ レ Network 26 days numbers 98 Page in ト ロ ニ Network ス March in 2007, day Longitude BP societies (Nikkei electron Page 98 on March 26 in 2007, Nikkei BP societies)
The subject that the invention solves
In the contactless power supply system shown in Fig. 7, day is carried respectively in power transmission device 701 and portable terminal 702 Line.In this case, about the antenna for being equipped on the portable terminal 701 as power side, in order to keep portable terminal small-sized Change, it is desirable that the miniaturization of antenna.In contrast, in the power transmission device 701 as power transmission side, with as power receiving device just It can be freer if charged area, wireless-communication-capable area bigger when taking the progress of formula terminal 702 contactless communication, non-contact charge Power receiving device is placed on ground, therefore is equipped on the antenna on the power transmission device 701 as power transmission side and it is expected bigger.But when making to send When the antenna of electric installation 701 becomes larger, communication sensitivity deteriorates and is unable to fully to ensure communication or can not be into wireless communications Row communication.In addition, in based on non-contacting charging, between the antenna and the antenna of portable terminal 702 of power transmission device 701 Transmission loss increase and charge efficiency reduce.
In addition, in contactless power supply system, when wireless-communication-capable area and charged area be not roughly the same, according to putting The position of power receiving device (portable terminal 702) is set, also occurs that the feelings that carries out wireless communication but can not charge sometimes Condition or its opposite situation.Therefore, it is desirable to keep wireless-communication-capable area consistent with charged area.But if in order to make power transmission fill The wireless-communication-capable area set in 701 is consistent with charged area, and wants to connect the radio antenna in power transmission device 701 with non- Tactile fed antenna closely configures, then interferes between antenna and be possible to incur the deterioration of communication sensitivity, charge efficiency Deterioration.In particular, when conveying big electric power to be charged to portable terminal, if between being unable to fully to ensure antenna Isolation (isolation), it is likely that cause power leakage to damage wireless communication circuit to the circuit of wireless communication.
In addition, in the wireless communication for data transmission, compared with the case where transmitting electric power, wireless communication standard, In terms of decree, transmits electric power and be restricted.Therefore, when increase is equipped on the wireless communication antenna of power transmission device 701, relatively Decline in the magnetic density of antenna area, with the degree of coupling being equipped between the wireless communication antenna of portable terminal 702 Become smaller and receiving sensitivity decline.Therefore, in power transmission device 701, increase wireless communication antenna compared with power transmission antenna Situation is restricted, as a result, being difficult to scale up wireless-communication-capable area.
Other projects and new feature can be specified according to the description of this specification and attached drawing.
According to one embodiment, as the antenna for power transmission, resonance coil and power supply coil are set.Resonance coil exists The both ends of its coil connect capacitance, based on the resonant frequency of inductance and capacitance possessed by the coil and the frequency phase for being used for power transmission Deng.Power supply coil carries out magnetic couplings with resonance coil, and power transmission electric power is passed to resonance by magnetic couplings from power supply coil Coil, the electric power transmitted are supplied to the coil of mancarried device side antenna by magnetic resonance mode from resonance coil.In the feelings Under condition, as the feature of magnetic resonance mode, the influence by the signal source impedance of power supply coil side can be inhibited and the resonance that generates The loss of coil increases, therefore can generate stronger magnetic field from resonance coil.Therefore, in the embodiment party using magnetic resonance mode In formula, the transmission distance compared with electromagnetic induction method between coil (between the coil and the coil of mancarried device side of power transmission side) From can be longer, and pass through and increase power transmission side area coil, it can be ensured that big charged area.
According to one embodiment, the coil of power transmission antenna is in a manner of the magnetic resonance with resonance coil and power supply coil It is formed, the coil of wireless communication antenna is formed with the electromagnetic induction method being made of several turn coils.Form power transmission antenna The resonance coil of coil is configured to the inside of the coil close to wireless communication antenna.Alternatively, the coil of wireless communication antenna It is configured to the inside of the resonance coil close to the aerial coil of power transmission.Resonance coil can not only be used in power transmission as a result, It is used in power transmission, additionally it is possible to which resonance coil is used as to the coil of antenna in wireless communication.On the other hand, in wireless communication day Suppression circuit is set between the terminal of the coil of line, in an ON state, thus, it is possible to prevent from conveying for suppression circuit in power transmission A part for electric power leaks to the circuit of wireless communication, so as to prevent the circuit of wireless communication to be destroyed.
Also, adjustment circuit according to one embodiment, is added between the terminal of power supply coil, enabling seek nothing The raising of the communication sensitivity of line communication.As a result, wireless communication when, by the adjustment circuit adjust power supply coil terminal it Between impedance, using from wireless communication with aerial coil to power supply coil coupling come seek wireless communication when sensitivity Improvement.
In wireless communication in the embodiment different with used frequency when power transmission, can change with resonance coil into The value of the resonance capacitance of row coupling.Frequency when resonant frequency can either be changed to be suitable for wireless communication as a result, also can It is changed to be suitable for frequency when power transmission, even if can be incited somebody to action if wirelessly communicating in the case of using different frequency in power transmission Resonance coil effectively utilizes when wireless conveying and both when power transmission.
According to said one embodiment, can prevent from leading to channel radio due to leaking to radio communication circuit in power transmission The circuit of credit is destroyed.In addition, wireless-communication-capable area when larger can set wireless communication, can make wireless-communication-capable area It is all larger each other with charged area and keep region consistent.It is more accurately non-contact thereby, it is possible to obtain the positioning of portable terminal Power supply system.
Figure 1A is the block diagram for the non-contact charging device for indicating first embodiment.
Figure 1B is the configuration diagram of the configuration for the power transmission coil part for indicating first embodiment.
Fig. 1 C are the configuration diagrams of the configuration for the power transmission coil part for indicating first embodiment.
Fig. 2A is the block diagram for the non-contact charging device for indicating second embodiment.
Fig. 2 B are the configuration diagrams of the configuration for the power transmission coil part for indicating second embodiment.
Fig. 2 C are the configuration diagrams of the configuration for the power transmission coil part for indicating second embodiment.
Fig. 3 is the block diagram for the non-contact charging device for indicating third embodiment.
Fig. 4 is the circuit diagram of semiconductor switch circuit.
Fig. 5 A are the performance plots of the transmission characteristic between antenna when indicating wireless communication.
Fig. 5 B are the performance plots of the transmission characteristic between antenna when indicating wireless communication.
Fig. 6 is the block diagram for indicating contactless power supply system.
Fig. 7 is the block diagram of the module for the contactless power supply system for indicating formerly to study.
It is shown as the module of the non-contact charging device of first embodiment in figure 1A.In the figure, 1 is non-contact Charging unit, 101 be the wireless communication parts such as NFC, 102 circuits in order to control, and 103 be non-contact power Transmission portion, 104,105 for With circuit, 106 be suppression circuit, and 107 be to improve the sensitivity adjustment circuit of wireless communication sensitivity (hereinafter sometimes referred to adjust Circuit), 110 be power transmission antenna part.Power transmission antenna part 110 has the coil 111 of wireless communication antenna, resonance coil 112, supplies The coil 113 (being represented by dashed line) and resonant capacitance 114 of electric antenna.It is not particularly limited, wireless communication part 101 and non-connects Electric shock power delivery section 103 is respectively formed in a semiconductor chip.
In the figure, wireless communication part 101 is connected via match circuit 104 with the coil 111 of wireless communication antenna, And it is connected with suppression circuit 106 at the both ends of the coil 111.On the other hand, non-contact power Transmission portion 103 is via matching electricity Road 105 is connected with power supply coil 113, and is connected with adjustment circuit 107 at the both ends of power supply coil 113.Resonant capacitance 114 It is connected in parallel with resonance coil 112, with the resonant frequency change based on the capacitance that shakes from inductance value harmony possessed by resonance coil 112 It obtains the mode equal with power transmission frequency and determines each value.By it is following explanation it is understood that suppression circuit 106 when carrying out power transmission at In on-state, it is off when being communicated.On the other hand, adjustment circuit 107 is in when carrying out power transmission and disconnects State, in an ON state when being communicated.
Above-mentioned match circuit 104 is with when suppression circuit 106 is off, in wireless communication part 101 and coil 111 Between the mode of impedance matching set.At this point, coil 111 carries out magnetic couplings with resonance coil 112 and power supply coil 113, Therefore reflection is generated because resonance coil 112 are arranged influence to coil 111 and adjustment circuit 107 in an ON state when The influence to coil 111 generated by power supply coil 113, seeks the matching of impedance.It is in and disconnects in suppression circuit 106 as a result, State, adjustment circuit 107 in an ON state under communication when, impedance matching between wireless communication part 101 and coil 111 becomes It obtains most preferably, so as to improve the sensitivity of communication.
In the present embodiment, wireless communication and power transmission are exclusively executed.Therefore, above-mentioned match circuit 105 is set as In the state that adjustment circuit 107 is off, the impedance between non-contact power Transmission portion 103 and power supply coil 113 Match.
Then, hereinafter, illustrating that non-contact power acts.It is set in the wireless communication part 101 of non-contact charging device 1 Suppression circuit 106 is set as off-state by control circuit 102, and adjustment circuit 107 is set as on-state.In addition, control circuit 102 make wireless communication part 101 continuously or intermittently be acted, and detect power receiving device (portable terminal：It is not shown) be It is no to be placed near non-contact charging device 1.Electric wave from portable terminal is being detected by wireless communication part 101 In the case of, it is judged as that portable terminal (not shown) is placed near non-contact charging device (power transmission device) 1, channel radio Letter portion 101 is communicated with portable terminal, judges whether placed portable terminal is charging object by control circuit 102 Equipment.In the case that portable terminal that can authenticate to be placed is the equipment of charging object, control circuit 102 will press down Circuit 106 processed is set as on-state, and adjustment circuit 107 is set as off-state.At this point, control circuit 102 is by non-contact electric power Delivery section 103 is set as on-state.Non-contact power Transmission portion 103 will transmit electric power as a result, is output to via match circuit 105 Power supply coil 113.This is transmitted electric power and is transported to power receiving device via resonance coil 112, the battery in power receiving device is carried out Charging.
Figure 1B and Fig. 1 C show the one of the configuration of the coil 111,112,113 of power transmission antenna at this time and the direction of magnetic flux Example.Figure 1B and Fig. 1 C are the section A-A for indicating the antenna part 110 shown in Figure 1A respectively ' figure.According to Figure 1A~Fig. 1 C it is found that Resonance coil 112 is set to the inside of the coil 111 of wireless communication antenna in the same plane, power supply with coil 113 with The mode that resonance coil 112 is overlapped is set to the position that lower surface (face of lower section) is more leaned on than resonance coil 112.It does not limit especially It is fixed, but each coil is made of the wiring of the winding of several circles.In Figure 1A~Fig. 1 C, in fig. ib when wireless communication indicated by an arrow Magnetic flux, in fig. 1 c magnetic flux when power transmission indicated by an arrow.
As the direction of magnetic flux, from coil towards portable terminal end side.According to magnetic flux when indicating to wirelessly communicate Figure 1B considers to lead to power receiving device from the coil 111 of wireless communication antenna in addition to magnetic flux it is found that about magnetic flux at this time Other than side, also pass through the magnetic flux via resonance coil 112.The wireless communication via resonance coil 112 is also carried out as a result, because This can realize the communication zone of bigger.It is adjusted at this time using the adjustment circuit 107 being connected with the both ends of power supply coil 113 Wireless communication sensitivity.That is, when carrying out wireless communication, adjustment circuit 107 is in an ON state.At adjustment circuit 107 When the power transmission of off-state, in a manner of keeping power transmission efficiency good, the inductance value and resonant capacitance of resonance coil 112 are set 114 value.However, when carrying out wireless communication, due to the equal items different from the configuration of radio antenna 111 of power supply coil 113 The difference of part, the inductance value of set resonance coil 112 and the value of resonant capacitance 114 are not necessarily best.That is, carrying out nothing Line communicate when, consider based on resonance coil 112 and resonant capacitance 114 resonant frequency with based on the coil of radio antenna Resonant frequency between generate difference.In order to cope with the situation, when carrying out wireless communication, adjustment circuit 107 is set as connecting State, so as to the resonant frequency based on coil 111 and adjustment circuit 107 and be determined by resonance coil 112 and resonant capacitance 114 The consistent mode of resonant frequency is adjusted.As explanation below, such as the capacitance by constituting adjustment circuit 107 And/or the setting of resistance carries out the adjustment.The raising of sensitivity when seeking to wirelessly communicate as a result,.
When then, about the power transmission shown in Fig. 1 C, the magnetic flux from power supply coil 113 is coupled with resonance coil 112, quilt It further strengthens and is transferred to power receiving device side.At this point, between the terminal of such as coil of the coil 111 of wireless communication antenna It is short-circuit by suppression circuit 106.As a result, in the inside of coil 111 by induced electromotive force streaming current, can inhibit pair Match circuit 104 provides electric current, can prevent wireless communication part 101 and match circuit 104 from being destroyed by overvoltage.
Further, it is contemplated that between the coil 111 and power supply coil 113 of radio antenna or the coil of power transmission antenna with Interference is generated between radio antenna coil 111, but the interference is can to ignore the interference of degree.
In the above-described first embodiment, though by radio antenna coil and power transmission aerial coil with close side Formula configures so that wireless-communication-capable area is under the unanimous circumstances of charged area, and mutual interference is also few, also, is carrying out channel radio When letter, the coil 111 of radio antenna is coupled with resonance coil 112, and thus, it is possible to expand wireless-communication-capable area.Separately Outside, when carrying out power transmission, wireless communication part 101 or match circuit 104 can be prevented to be destroyed by suppression circuit 106.
In addition, in the present embodiment, when carrying out power transmission, in resonance coil 112 and the day for being set to portable terminal Electric power is provided in a manner of magnetic resonance between line (coil).At this point, with magnetic induction side between resonance coil 112 and power supply coil 113 Formula couples.(include resonance coil in antenna and the wireless communication coil 111 of portable terminal in addition, when carrying out wireless communication 112) transmission of signal is carried out between with electromagnetic induction method.
The block diagram of non-contact charging device involved by second embodiment is shown in fig. 2.In fig. 2, pair with figure The identical parts 1A mark identical reference numeral, omit explanation related with same section, only illustrate different parts.
In fig. 2, the part different from Figure 1A is power transmission antenna part.In the figure, power transmission is indicated with reference numeral 210 Antenna part.Power transmission antenna part 210 has resonance coil 211, power supply coil 212 (being represented by dashed line), radio antenna coil 213 and resonant capacitance 214.It will also realize that according to Fig. 2 B and Fig. 2 C hereinafter illustrated, it is different from the power transmission antenna shown in Figure 1A, It is configured in the inside of resonance coil 211 and power supply coil 212 configuration radio antenna coil 213.
The direction that the configuration and magnetic flux of the coil of power transmission antenna part 210 are shown in Fig. 2 B and Fig. 2 C, is used in fig. 2b The direction of magnetic flux when arrow indicates wireless communication, in fig. 2 c magnetic flux when power transmission indicated by an arrow.As each Configuration between coil, the coil 213 of configuration resonances coil 211 and wireless communication antenna in the same plane, with resonance The mode that coil 211 is overlapped is configured with power supply coil 212 in the lower surface of resonance coil 211.That is, wireless communication antenna Coil 213 is closely configured in the inside of resonance coil 211 and power supply coil 212.With the embodiment shown in Figure 1A~Fig. 1 C Similarly, the section A-A shown in Fig. 2A is indicated with Fig. 2 B and Fig. 2 C '.In addition, portable terminal is centered on resonance coil 211, It is set to the opposite side of power supply coil 212.That is, placing portable terminal in the arrow direction of magnetic flux.
In the case of the second embodiment shown in Fig. 2A, also when carrying out wireless communication, as shown in Figure 2 B, it is believed that magnetic Flux not only also passes through via resonance coil 211 via the antenna of wireless communication 213.Therefore, with first shown in Figure 1A Embodiment similarly can make wireless-communication-capable area larger.Also, in this second embodiment, wireless communication frequency with give In the case of electric frequency difference, in particular, power transmission frequency be less than wireless communication frequency when, in terms of the efficiency of transmission of electric power compared with Favorably.This is because, when power transmission frequency is less than wireless communication frequency, in order to inhibit the efficiency of power transmission to reduce, need to increase Big resonance coil from inductance value, the outside of the coil 213 by the way that resonance coil to be configured to wireless communication is easy to get bigger From inductance value.
In this way, in this second embodiment, other than the effect illustrated in the first embodiment, also having in power transmission Frequency can inhibit the efficiency of power transmission to reduce this effect when being less than wireless communication frequency.
The block diagram of the non-contact charging device involved by third embodiment is shown in FIG. 3.In the figure, pair with it is above-mentioned The identical part Figure 1A and Fig. 2A of explanation marks identical reference numeral, omits explanation related with same section, only illustrates Different parts.
In figure 3, the part different from Figure 1A and Fig. 2A is that resonant capacitance 114 (214) is changed to resonant capacitance switching electricity Road 310.
Resonant capacitance switching circuit 310 has the resonant capacitance 311 used when carrying out power transmission, when carrying out wireless communication The corrective capacity 312 and switching circuit 313 used.In the switching circuit, resonant capacitance 311 is connected with corrective capacity 312 Connection, switching circuit 313 are connected in parallel with corrective capacity 312.It is humorous using this when power transmission frequency is with wireless communication frequency difference It shakes capacitance switching circuit 310.That is, in power transmission frequency and in the case of wireless communication frequency difference, according to be carry out power transmission or It carries out wireless communication to make switching circuit 313 turn on/off.In other words, resonant capacitance switching circuit 310 can be considered as variable Condenser network.It determines to implement power transmission by control circuit 102 or implements wireless communication, therefore by control circuit 102 to switch Circuit 313 carries out on/off control.Low frequency when considered when power transmission using than wireless communication.For example, it is contemplated that as wireless Communication frequency and use the widely used 13.56MHz such as RFID, use 6.78MHz as power transmission frequency.
In the case of stating such frequency in use, when carrying out wireless communication, switching circuit is made by control circuit 102 313 are off.211 structure of capacitance and resonance coil being connected in series with as a result, by resonant capacitance 311 and corrective capacity 312 At resonance circuit with wireless frequency (such as 13.56MHz) carry out resonance.On the other hand, when carrying out power transmission, control circuit Switching circuit 313 is set as on-state by 102, and corrective capacity 312 is set as short-circuit condition.As a result, when carrying out power transmission, by humorous The resonance circuit that capacitance 311 and resonance coil 211 are constituted that shakes carries out resonance with power transmission frequency (such as 6.78MHz).
By being set as above structure, switch the resonant frequency of resonance coil in wireless communication and when power transmission, even if thus In the case of wireless communication frequency and power transmission frequency difference, also in the same manner as the second embodiment shown in Fig. 2A, Neng Gou Resonance coil is used in when wireless communication and both when power transmission.
Fig. 4 is the suppression circuit used in above-mentioned first embodiment to third embodiment, adjustment circuit, resonance frequency The circuit diagram of switching circuit in rate switching circuit.In the figure, 401 be to constitute above-mentioned suppression circuit (to be by taking Figure 1A as an example 106), the switching circuit 313 in adjustment circuit (being in figure 1A 107) and resonant frequency switching circuit (being in figure 3 301) Switching circuit.In Fig. 4,410,411 be terminal, and 412 terminals in order to control, 413,414 be capacitance, and 415,416 be field-effect Transistor (hereinafter sometimes referred to transistor), 417 be ground resistance, and 418,419 be biasing resistor.Field-effect transistor 415, The 416 common connection of respective source electrode, the common tie point are grounded, field-effect transistor 415,416 via ground resistance 417 Respective drain series be connected with terminal 410,411 via capacitance 413,414.In addition, field-effect transistor 415, 416 grid is connected via biasing resistor 418,419 with control terminal 412 respectively.
Switching circuit 401 is used in suppression circuit, adjustment circuit and resonant frequency switching circuit respectively, but according to institute The circuit that uses is different and the effect of resistance 417, capacitance 413,414 is different, therefore electricity used in explanation respectively below Effect in road.
In the switching circuit 401 for constituting suppression circuit (being in figure 1A 106), terminal 410 and radio antenna The one end of coil 111 is connected, and terminal 411 is connected with the other end of coil 111.In addition, from control circuit 102 to control Terminal 412 processed provides control signal, and according to the control signal, when providing electric power, transistor 415 and 416 is in the conduction state, When carrying out wireless communication, transistor 415 and 416 is in cut-off state.As a result, at switching circuit 401 (here, suppression circuit) In on-state or off-state.By using the switching circuit for the structure for being connected in series field-effect transistor, even High voltage amplitude when power transmission, due to being to be connected in series, so applying between the drain electrode and source electrode of scene effect transistor Voltage also reduce half, therefore resistance to pressure is strong and can more inexpensively obtain, it can be said that being suitable as non-contact The semiconductor switch circuit used in power supply system.In addition, using capacitance 413,414, DC voltage can be prevented to be applied to crystalline substance Body pipe, so as to prevent the characteristic of transistor from changing.Resistance 417 uses the high electricity of the impedance than transmitting signal system Resistance.As a result, when making each transistor be acted, respective source potential can be made to be fixed as earthing potential.
In the switching circuit 401 for constituting adjustment circuit (being in figure 1A 107), terminal 410 and the one of power supply coil 113 End is connected, and terminal 411 is connected with the other end of coil 113.In addition, being carried from control circuit 102 to control terminal 412 For controlling signal, according to the control signal, when providing electric power, transistor 415 and 416 is in cut-off state, is carrying out channel radio Transistor 415 and 416 is in the conduction state when letter.As a result, switching circuit 401 (here, adjustment circuit) be off or Person's on-state.When carrying out wireless communication adjustment circuit (switching circuit) in an ON state when, i.e. 415 and of transistor 416 it is in the conduction state when, be formed in the CR (electricity with capacitance 413,414 and resistance 417 between the end of power supply coil 113 Appearance and resistance) circuit.Set the value of capacitance 413,414 and/or the value of resistance 417 so that when carrying out wireless communication, by coil 111 and the resonant frequency that constitutes of above-mentioned CR circuits be suitable for holding 114 resonance circuits constituted by resonance coil 112 and resonance electricity consumption Resonant frequency.When carrying out the setting, it is also contemplated that the conducting resistance of setting transistor 415,416 is set.
In the switching circuit 401 for constituting the switching circuit 313 in resonant frequency switching circuit (being in figure 3 310), end Son 410 is connected with the one end (terminal of capacitance 312) of resonance coil 211, terminal 411 be connected to resonant capacitance 311 with it is humorous Shake the common tie point of capacitance 312.That is, switching circuit 401 is connected in parallel with capacitance 312.In addition, from control circuit 102 to control Terminal 412 processed provides control signal, and according to the control signal, when carrying out wireless communication, transistor 415,416 is in cut-off shape State, when providing electric power, transistor 415,416 is in the conduction state.Switching circuit 401 is (here, resonant frequency switching electricity as a result, Road) it is off or on-state.In this way, making as the switching circuit 313 in resonant frequency switching circuit 310 In the case of switching circuit 401, the effect of the effect of capacitance 413,414 and resistance 417 and the capacitance and resistance of suppression circuit It is identical.In the case where switching circuit 401 is used as switching circuit 313, the possibility for applying DC voltage is low, therefore can also Above-mentioned capacitance 413,414 is omitted, by omitting above-mentioned capacitance 413,414, additionally it is possible to seek the miniaturization of switch.
Then, using Fig. 5 A and Fig. 5 B explanations for confirming when carrying out wireless communication by close to configuration resonances coil Wirelessly communicate the experimental result that sensitivity improves this case.Fig. 5 A show power transmission side only by radio antenna and power side The transmission characteristic between radio antenna coil when radio antenna is opposite, Fig. 5 B show to show in the first embodiment The inside of the radio antenna coil gone out is configured with the transmission characteristic in the case of resonance coil and power supply coil.In addition, In Fig. 5 A and Fig. 5 B, horizontal axis indicates that frequency, longitudinal axis expression pass through characteristic.
In addition, about the aerial coil for experiment, wireless communication is 8cm × 13cm with aerial coil and is enclosed for 4, resonance Coil is 6.5cm × 11.5cm and is enclosed for 8, resonant capacitance 22pF that power supply coil is 5cm × 9.5cm and is enclosed for 1, opposite The aerial coil of the wireless communication of power receiving device side is 4cm × 4cm and is enclosed for 3.In addition, the frequency of wireless communication and power transmission is 13.56MHz, the distance between radio antenna are 1cm.
Fig. 5 A are compared with Fig. 5 B it is found that about, by loss, having resonance coil between radio antenna Fig. 5 B 8.5dB or so is higher by by characteristic, can reduce the loss between radio antenna using resonance coil, therefore Seek the raising of communication sensitivity.
Then, using Fig. 6 illustrate include above-mentioned first to the contactless power supply system of third embodiment power receiving device An example of whole action inside.Fig. 6 assumes that power side is equipped on the non-contact power system of small portable apparatus etc. System.
In figure 6,2 be power receiving device (portable terminal), and 610 be power transmission antenna part.In the figure, non-contact charge fills Setting 1 has structure identical with the first embodiment shown in Figure 1A.In addition, in order to avoid the complication of attached drawing, simplifies and indicate Antenna part 110.In addition, due to illustrating non-contact charging device 1 using Figure 1A~Fig. 1 C before, it is non-in this description will be omitted Contact charging device.
Power receiving device 2 by common wireless communication antenna and power receiving antenna common antenna coil 610, level sensitive circuit 611, switching circuit 612, control circuit 613, wireless communication part 614 and power receiving section 615 are constituted.In the present embodiment, will These each module (common antenna coil 610, level sensitive circuit 611, switching circuit 612, control circuit 613, wireless communication parts 614 and power receiving section 615) be sealed in an IC card, be set as contactless IC card.By the contactless IC card and battery one (not shown) It rises and is equipped on portable terminal, so that each module is acted by battery.In addition, being charged the battery using power receiving section 615. Above-mentioned each piece can not also be sealed in IC card, but is used as equipped with wireless communication function and non-contact by each module and battery The portable terminal of function of supplying power.Then, to be illustrated centered on the action of power receiving device 2 in contactless power supply system.
The switching circuit 612 of power receiving device 2 usually becomes 614 side of wireless communication part, in reception from power transmission device 1 The state of wireless communication signals.Moreover, in the case where power receiving device 2 to be positioned near power transmission device 1, receives and come from power transmission The wireless communication signals of device 1 and carry out wireless communication, in power transmission device 1 carry out power receiving device 2 whether be charging object Certification sends electric signals in the case where it is charging object to be judged as power receiving device 2 from power transmission device.At this point, when by electricity It is detected in the level sensitive circuit 611 of device 2 when receiving electric power electric signals higher than wireless signal, in control circuit 613 In, switching circuit 612 is switched to 615 side of power receiving section, thus by the electric power input received to power receiving section 615.In power receiving section In 615, the electric power received is subjected to rectification and be filled into via charging control circuit and is equipped on the battery of power receiving device 2 (not Diagram) in.Although in the figure and not shown, power supply is provided to each module of mobile terminal device 1 from battery.
At this point, charge control system as follows can also be realized easily, that is, due to cannot be by electric process Row wireless communication, therefore power transmission device 1 is to grasp the state of the power receiving devices such as the charging complete to power receiving device 2, intermittently It carries out wireless communication, grasps the state of power receiving device 2.
In addition, in the power transmission antenna part 620 of power transmission device 1, by using embodiment 1 to the power transmission of embodiment 3 Antenna can obtain the contactless power supply system of wireless-communication-capable area and charged area bigger.
More than, the invention that present inventor completes specifically is illustrated based on embodiment, but it is of the invention and unlimited Due to this, can unquestionably make various changes within the scope of its spirit.
The present invention relates to non-contact charging devices, such as can be widely applied for equipped with contactless IC card and battery Portable device provides the non-contact charging device of data communication and power supply and is filled with portable device and non-contact charge The contactless power supply system set.
1：Power transmission device
2：Power receiving device
101、614：Wireless communication part
102、613：Control circuit
103：Non-contact power Transmission portion
104、105：Match circuit
106：Suppression circuit
107：Adjustment circuit
110、210、620：Power transmission antenna part
111、213：Radio antenna coil
112、211：Resonance coil
113、212：Power supply coil
114、214、311：Resonant capacitance
310：Resonant capacitance switching circuit
312：Corrective capacity
313：Switching circuit
610：Common antenna coil
611：Level sensitive circuit
612：Switching circuit
615：Power receiving section
1. a kind of contactless power supply system has the non-contact charging device to transmit electric power by magnetic couplings and with non-contact Mode receive the mobile terminal device of the electric power from the non-contact charging device, the non-contact charging device and institute It states mobile terminal device to be respectively provided in the wireless communication part communicated between each other, the mobile terminal device has The battery to be charged by the non-contact charging device, the contactless power supply system be characterized in that,
The non-contact charging device has：
Wireless communication aerial coil for wireless communication；
Power Transmission aerial coil, with power supply coil and resonance coil, when carrying out power transmission, from the power supply coil pair The resonance coil provides electric power, and power transmission is carried out to the mobile terminal device from the resonance coil；
Variable capacitance circuit is connected with the resonance coil；And
Adjustment circuit is connected with the power supply coil, when carrying out wireless communication, by so that power supply coil resonance frequency Rate is suitable for that there is the mode of the resonant frequency of the resonance circuit of the resonance coil and the variable capacitance circuit to be set Adjust communication sensitivity,
The resonance coil and the wireless communication together with aerial coil resonance and carry out the wireless communication of electromagnetic induction method,
Resonant frequency based on the resonance coil and the variable capacitance circuit is when carrying out wireless communication and when carrying out power transmission Change.
2. contactless power supply system according to claim 1, which is characterized in that
With the suppression circuit being connected with aerial coil with the wireless communication, when transmitting electric power, inhibit electric signals to Wireless communication part leaks.
3. contactless power supply system according to claim 1, which is characterized in that
Semiconductor switch is used in the on/off action of the adjustment circuit.
4. contactless power supply system according to claim 2, which is characterized in that
5. contactless power supply system according to claim 2, which is characterized in that
Semiconductor switch is used in the on/off action of the suppression circuit.
6. contactless power supply system according to any one of claims 1 to 5, which is characterized in that
It is configured with the power Transmission aerial coil in the inside of wireless communication aerial coil.
7. a kind of non-contact charging device, carry out data transmission between mobile terminal device and to the portable terminal The supply of the electric power of end device, the non-contact charging device have：
Wireless communication part carries out data transmission；
Wireless communication aerial coil is coupled with the wireless communication part, is used for the data transmission；
Power supply coil；
Resonance coil；
Suppression circuit is connected with the wireless communication with aerial coil, and electric power is being provided to the mobile terminal device When, inhibit signal to be transmitted from the wireless communication aerial coil to the wireless communication part；
Adjustment circuit is coupled with the power supply coil, when carrying out the data transmission, by so that power supply coil resonance Frequency is suitable for that there is the mode of the resonant frequency of the resonance circuit of the resonance coil and the variable capacitance circuit to be set It is fixed to control communication sensitivity,
The resonance coil in data transmission, together with wireless communication aerial coil resonance and formed and to be transmitted The adaptable magnetic flux of data forms the magnetic flux being adapted with the electric power to be conveyed when transmitting electric power,
8. non-contact charging device according to claim 7, which is characterized in that
The resonance coil and the wireless communication are formed in a plane with aerial coil, and the resonance coil is configured at described The inside of wireless communication aerial coil.
9. non-contact charging device according to claim 7, which is characterized in that
The resonance coil and the wireless communication are formed in a plane, the wireless communication aerial coil with aerial coil It is configured at the inside of the resonance coil.
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Applicant after: Renesas Electronics Corporation
Applicant before: Renesas Electronics Corporation