CN104348257A - Wireless power-transmitting device, method and system - Google Patents
Wireless power-transmitting device, method and system Download PDFInfo
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- CN104348257A CN104348257A CN201310326959.XA CN201310326959A CN104348257A CN 104348257 A CN104348257 A CN 104348257A CN 201310326959 A CN201310326959 A CN 201310326959A CN 104348257 A CN104348257 A CN 104348257A
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Abstract
The invention discloses a wireless power-transmitting device, a wireless power-transmitting method and a wireless power-transmitting system. The transmitting device comprises a power supply, a resonant unit, a load searching unit, a load positioning unit and a controller, wherein the resonant unit comprises a coil-subunit selecting circuit and at least two coil subunits, and the controller is used for judging the loaded state of the resonant unit through the load searching unit; when the resonant unit is judged to be loaded, a coil-subunit mark which can be used for charging a load in the resonant unit is acquired through the load positioning unit, a closing signal corresponding to the coil-subunit mark is sent to the coil-subunit selecting circuit, and the resonant unit is marked to be in a charging state. According to the wireless power-transmitting device, the wireless power-transmitting method and the wireless power-transmitting system provided by the embodiment of the invention, the problem that when charged equipment is randomly placed at the charging area of a wireless charging device, the charged equipment cannot be effectively charged by the wireless charging device can be solved.
Description
Technical field
The present invention relates to electric automatization and the communications field, particularly relate to a kind of Contactless power transmission device, method and system.
Background technology
Can be found so far by the mankind by electric energy transmitting from electromagnetic induction phenomenon and wire, the transmission of electric energy is mainly directly contacted by wire to be carried out transmitting, but this mode in use exists contact sparking and dangerous bare exposed conductor causes the potential safety hazards such as electric shock, wireless power transmission technology can make up these deficiencies.Utilizing way of electromagnetic induction by the new technique of delivery of electrical energy to product used, can be the equipment wireless chargings at any time such as the household electrical appliance such as mobile device, electric heater, electric tool, illumination, medical treatment such as laptop computer.
Along with mobile phone, the development of the portable electronic communication product such as panel computer, the development prospect of wireless charging is boundless, when charging, as long as be positioned on corresponding charging platform by charging device, electromagnetic induction principle just can be utilized to charge, but, in the prior art, due to the stationarity of the built-in electromagnetic induction coil position of charging platform, needed to be positioned over corresponding position on charging platform by charging device, just can charge normally, that is, needed accurately to aim at the built-in transmitting coil of charging platform by the receiving coil of charging device inside, when by charging device by random being placed on charging platform time, charging often cannot normally be carried out, in addition, current wireless charging device mainly man-to-man charging device on the market, that is a charging device can only be one at one time and charged by charging device, when user needs to charge to multiple devices at the same time simultaneously, brings inconvenience to user.
Summary of the invention
In view of this, the invention provides a kind of Contactless power transmission device, method and system, this programme can solve when being arbitrarily positioned over the charged area of Contactless power transmission device by charging device, Contactless power transmission device to the problem of being carried out effectively charging by charging device, cannot improve the degree of freedom of wireless charging, the convenience of charging system use and the validity of wireless charging system.
In first aspect, the embodiment of the present invention provides a kind of Contactless power transmission device, comprise: power supply, resonant element, load search unit, load orientation unit and controller, described resonant element comprises coil subelement selection circuit and at least two coil subelements
Described power supply, for powering for described resonant element;
Described load search unit, for judging the bringing onto load state of described resonant element;
Described load orientation unit, can carry out for load the coil sub-cell identification that charges for determine in described resonant element;
Described controller is used for the bringing onto load state being judged described resonant element by described load search unit, when judging described resonant element bringing onto load, being obtained in described resonant element by described load orientation unit can be the coil sub-cell identification of load charging, send the closure signal corresponding with described coil sub-cell identification to described coil subelement selection circuit, and to mark described resonant element be charged state;
Described coil subelement selection circuit is according to described closure signal, and the closed coil subelement corresponding with described closure signal, charges to load.
In the implementation that the first is possible, described load orientation unit comprises further: current measurement circuit and telecommunication circuit, wherein, described current measurement circuit is for measuring the output current value of described resonant element, and measurement result is sent to described controller, described telecommunication circuit is connected with described controller, for the information received is sent to described controller
Described controller is obtained in described resonant element can be comprised further for the coil sub-cell identification of load charging by described load orientation unit:
Described controller controls the predetermined coil subelement of described coil subelement selection circuit successively at short notice in closed described resonant element, if judge, the difference of the output current value that described current detection circuit is measured and reference current value is greater than threshold value, and the coil subelement marking described selection is detecting unit;
Close the coil subelement around the coil subelement being labeled as detecting unit in preset range successively at short notice, if judge, the difference of the output current value that described current detection circuit is measured and reference current value is greater than threshold value, and the coil subelement marking described selection is detecting unit;
The coil subelement of detecting unit is labeled as described in closing in the given time successively, if described telecommunication circuit receives load id information, judge that the coil subelement of described selection is the coil subelement that can charge as load, obtaining described can be the coil sub-cell identification that load is charged.
In the execution mode that the second is possible, described device also comprises load condition determining unit, when described resonant element is in charged state, for judging the connection load condition in described resonant element, wherein, described connection load condition comprises: charging complete, move and shift out resonant element in resonant element:
When judging that described connection load condition is charging complete, described controller sends cut-off signal to described coil subelement selection circuit, described coil subelement selection circuit, according to described cut-off signal, disconnects the connection of coil subelements all in described resonant element;
When judging described connection load condition as moving in resonant element, described controller disconnects the connection of coil subelements all in described resonant element, again obtaining in described resonant element can be the coil sub-cell identification that load is charged, and the closed coil subelement that can charge for load be that described mobile back loading charges;
When judging described connection load condition as shifting out resonant element, resonant element charged state mark removed by described controller, disconnects the connection of coil subelements all in described resonant element.
Further, described load condition determining unit comprises current measurement circuit and capacitance measurement circuit further, described current measurement circuit is for measuring the output current value of described resonant element, and measurement result is sent to described controller, measurement result for measuring the output capacitance value of described resonant element, and is sent to described controller by described capacitance measurement circuit; Described controller, with the fixed cycle successively trigger current testing circuit and capacitive detection circuit, to obtain the output current value and output capacitance value that foregoing circuit records, judges the connection load condition of described resonant element according to output current value and output capacitance value:
When described output current value declines within the predetermined time, and when described output capacitance value does not change within the predetermined time, described controller judges that connecting load condition is charging complete;
When described output current value declines within the predetermined time, and when described output capacitance value changes within the predetermined time and do not change to empirical value, described controller judges to connect load condition as moving in resonant element;
When described output current value declines within the predetermined time, and when described output capacitance value changes within the predetermined time and changes to empirical value, described controller judges to connect load condition as shifting out described resonant element.
Further, described power supply comprises further: DC power supply and inverter circuit, the output of described DC power supply connects the input of described inverter circuit, the adjustment signal that described inverter circuit sends according to described controller, adjustment running parameter, described running parameter comprises: inverter circuit phase shift and inverter circuit frequency, when described resonant element is in charged state, described controller controls the output current value that described current detection circuit measures described resonant circuit, the parameter configuration table of inquiry storage inside, send inverter circuit adjustment running parameter described in adjustment signal controlling, wherein, the corresponding relation between current value and inverter circuit parameter is have recorded in described parameter configuration table.
Further, described device comprises at least two resonant elements, described device also comprises resonant element selection circuit, for connecting described power supply and described at least two resonant elements, the bringing onto load state of at least two resonant elements described in described controller judges successively, obtain the resonant element mark wherein connecting load, send and identify corresponding Continuity signal to described resonant element selection circuit with the resonant element of described connection load, described resonant element selection circuit is according to described Continuity signal, set up the connection of the described power supply resonant element corresponding with described Continuity signal.
Further, described power supply comprises DC power supply and at least two inverter circuits further, wherein, the number of described inverter circuit is identical with the number of described resonant element, the input of at least two inverter circuits described in the output connection of described DC power supply, described at least two inverter circuits are connected with described at least two resonant elements respectively by described resonant element selection circuit.
In second aspect, embodiments provide a kind of wireless power transmission method, comprising:
S01, judge the bringing onto load state of resonant element;
S02, when judging resonant element bringing onto load, obtaining in described resonant element can be the coil sub-cell identification of load charging;
S03, send the closure signal corresponding with described coil sub-cell identification to coil subelement selection circuit;
S04, to mark described resonant element be charged state.
In the implementation that the first is possible, described step S02 comprises further:
Close the predetermined coil subelement in described resonant element successively at short notice, if judge, the output current value of described resonant element and the difference of reference current value are greater than threshold value, and the coil subelement marking described selection is detecting unit;
Close the coil subelement around the coil subelement being labeled as detecting unit in preset range successively at short notice, if judge, the output current value of described resonant element and the difference of reference current value are greater than threshold value, and the coil subelement marking described selection is detecting unit;
The coil subelement of detecting unit is labeled as described in closing in the given time successively, if receive load id information, judge that the coil subelement of described selection is the coil subelement that can charge as load, obtaining described can be the coil sub-cell identification that load is charged.
In the implementation that the second is possible, when described resonant element is in charged state, described method also comprises the connection load condition judged in described resonant element, and wherein, described connection load condition comprises: charging complete, move and shift out resonant element in resonant element:
When judging that described connection load condition is charging complete, sending cut-off signal to described coil subelement selection circuit, disconnecting the connection of coil subelements all in described resonant element;
When judging described connection load condition as moving in resonant element, disconnect the connection of coil subelements all in described resonant element, again obtaining in described resonant element can be the coil sub-cell identification that load is charged, and the closed coil subelement that can charge for load be that described mobile back loading charges;
When judging described connection load condition as shifting out resonant element, removing resonant element charged state mark, disconnecting the connection of coil subelements all in described resonant element.
Further, connection load condition in the described resonant element of described judgement comprises, obtain output current value and the output capacitance value of described resonant element with the fixed cycle, judge the connection load condition of described resonant element according to described output current value and described output capacitance value:
When described output current value declines within the predetermined time, and when described output capacitance value does not change within the predetermined time, judge that connecting load condition is charging complete;
When described output current value declines within the predetermined time, and when described output capacitance value changes within the predetermined time and do not change to empirical value, judge to connect load condition as moving in resonant element;
When described output current value declines within the predetermined time, and when described output capacitance value changes within the predetermined time and changes to empirical value, judge to connect load condition as shifting out described resonant element.
Further, when described resonant element is in charged state, described method also comprises:
Measure the output current value of described resonant circuit;
The parameter configuration table of inquiry storage inside, sends adjustment signal controlling inverter circuit adjustment running parameter, wherein, have recorded the corresponding relation between current value and inverter circuit parameter in described parameter configuration table.
Further, described step S01 comprises further:
The bringing onto load state of at least two resonant elements described in judging successively, obtains the resonant element mark wherein connecting load;
Send and identify corresponding Continuity signal to resonant element selection circuit with the resonant element of described connection load, set up the connection of the power supply resonant element corresponding with described Continuity signal.
In the third aspect, embodiments provide a kind of Wireless power transmission system, comprise described Contactless power transmission device and wireless power receiving system.
The embodiment of the present invention, by arranging multiple coil subelement in Contactless power transmission device, expands effective chargeable region in Contactless power transmission device in spatial dimension.Power transmission device is by the state of magnetic test coil subelement, choose with by the corresponding coil subelement of charging device putting position for be charged by charging device, by the Contactless power transmission device using the present embodiment to provide, arbitrarily can be placed in any position of charged area by charging device and accurately need not aim at certain specific region, improve the degree of freedom of wireless charging, the convenience of charging system use and the validity of wireless charging system.
Accompanying drawing explanation
Fig. 1 is the structural representation of the Contactless power transmission device of first embodiment of the invention;
Fig. 2 is the schematic diagram of the spatial arrangement form of a kind of coil subelement of first embodiment of the invention;
Fig. 3 is the flow chart of the wireless power transmission method of second embodiment of the invention;
Fig. 4 is a kind of the acquisition in resonant element of second embodiment of the invention can be the method flow diagram of the coil sub-cell identification of load charging;
Fig. 5 is the method flow diagram that the another kind of second embodiment of the invention obtains the coil sub-cell identification that can charge for load in resonant element;
Fig. 6 is a kind of method flow diagram judging charging load state of second embodiment of the invention;
Fig. 7 be third embodiment of the invention can be the structural representation that the Contactless power transmission device charged is carried out in multi-load;
Fig. 8 is the flow chart that can be the wireless power transmission method that multi-load is carried out charging of fourth embodiment of the invention.
Embodiment
In order to make the object, technical solutions and advantages of the present invention clearly, below in conjunction with accompanying drawing, the specific embodiment of the invention is described in further detail.Be understandable that, specific embodiment described herein is only for explaining the present invention, but not limitation of the invention.It also should be noted that, for convenience of description, illustrate only part related to the present invention in accompanying drawing but not full content.
First embodiment
Fig. 1 is the structural representation of the Contactless power transmission device of first embodiment of the invention.As shown in Figure 1, this Contactless power transmission device comprises: power supply 11, resonant element 12, controller 13, load search circuit 14 and load orientation circuit 15, wherein: resonant element 12 comprises: coil subelement selection circuit 121, First Line circle unit 122, second coil subelement 123, tertiary coil subelement 124, the 4th coil subelement 125, the 5th coil subelement 126 ..., N coil subelement 127.
In the present embodiment, power supply 11 is connected with the coil subelement selection circuit 121 in resonant element 12, for providing power supply for resonant element 12.
One end connection control device 13 of coil subelement selection circuit 121, the other end connect respectively First Line circle unit 122, second coil subelement 123, tertiary coil subelement 124, the 4th coil subelement 125, the 5th coil subelement 126 ..., N coil subelement 127, for the closure signal sent according to controller 13, closed corresponding coil subelement charges to load.
One end connection control device 13 of load search circuit 14, the other end connects resonant element 12, for judging whether connect load in resonant element 12, and Search Results is transferred to controller 13.
One end connection control device 13 of load orientation unit 15, the other end connects resonant element 12, can carry out the coil sub-cell identification that charges for determine in resonant element 12 for load.
Controller 13 is for judging the bringing onto load state of resonant element 12 by load search circuit 14, when judging resonant element 12 bringing onto load, being obtained in resonant element 12 by load orientation unit 15 can be the coil sub-cell identification of load charging, send the closure signal corresponding with described coil sub-cell identification to coil subelement selection circuit 121, and mark resonant element 12 for charged state;
Coil subelement selection circuit 121 is according to described closure signal, and the closed coil subelement corresponding with described closure signal, charges to load.
In the present embodiment, power supply 11 can be alternating current steady voltage plug, or the AC power be made up of DC power supply and inverter circuit.
In the present embodiment, coil subelement is arranged in resonant element 12 according to predetermined spatial arrangement form.
As shown in Figure 2 be a kind of schematic diagram of spatial arrangement form of coil subelement, wherein, the coil subelement in Fig. 2 represents in form of a coil.
Be understandable that, the present embodiment coil subelement can also adopt other spatial arrangement form, does not limit this.
In the present embodiment, coil subelement comprises: a coil of connection parallel with one another and multiple resonant capacitance.
One of the present embodiment preferred embodiment in, all coil subelements in resonant element 12 are with the form of parallel connection, the two ends of resonant element 12 are connected to by coil subelement selection circuit 121, when coil subelement selection circuit 121 closes some coil subelements, this coil subelement is access in the two ends of resonant element 12.By selecting suitable coil inductance and resonant capacitance value, ensure when one or more coil subelement access resonant element 12, resonant element 12 can be in resonance condition all the time, in actual applications, those skilled in the art can preset according to the parameter size of actual conditions to coil and resonant capacitance.
Be understandable that, the present embodiment coil subelement can also adopt other type of attachment to connect, such as: series connection, connection in series-parallel such as to combine at the mode, do not limit this.
In the present embodiment, coil subelement selection circuit 121 can be the relay of multichannel or the electronic switch of multichannel.
Be understandable that, the present embodiment coil subelement selection circuit 121 can also adopt other circuit that can realize variable connector control or variable connector chips, does not limit this.
In the present embodiment, load search circuit 14 can be capacitance measurement circuit, current measurement circuit or tension measuring circuit, by by when not placing load in the measured value of above-mentioned parameter and resonant element 12, the standard value of above-mentioned parameter compares, and to judge on resonant element whether bringing onto load.
One of the present embodiment preferred embodiment in, if resonant element 12 unmarked be charged state, controller 13, with fixed cycle scanning resonant element 12, judges the bringing onto load state of resonant element 12.
Exemplarily non-limiting, the above-mentioned fixed cycle can be set to 200ms, certainly, in actual applications, those skilled in the art can preset according to the size of actual conditions to the fixed cycle.
One of the present embodiment preferred embodiment in, load orientation unit comprises further: current measurement circuit (not shown) and telecommunication circuit (not shown).Wherein, measurement result for measuring the output current value of resonant element 12, and is sent to controller 13 by described current measurement circuit, and described telecommunication circuit is connected with controller 13, for the information received is sent to controller 13.
Controller 13 is measured resonant element 12 by the above-mentioned current measurement circuit of control and telecommunication circuit, and obtaining in resonant element 12 can be the coil sub-cell identification that load is charged.
Further, described Contactless power transmission device also comprises load condition determining unit (not shown), when resonant element 12 is in charged state, for judging the connection load condition in resonant element 12, wherein, described connection load condition comprises: charging complete, move and shift out resonant element in resonant element.Controller 13, according to the different conditions of described connection load, carries out different control to the coil subelement selection circuit 121 in resonant element 12.
One of the present embodiment preferred embodiment in, described load condition determining unit comprises current measurement circuit (not shown) and capacitance measurement circuit (not shown) further, current measurement circuit is for measuring the output current value of resonant element 12, and measurement result is sent to controller 13, measurement result for measuring the output capacitance value of resonant element 12, and is sent to controller 13 by described capacitance measurement circuit; Controller 13, with the fixed cycle successively trigger current testing circuit and capacitive detection circuit, to obtain the output current value and output capacitance value that foregoing circuit records, judges the connection load condition of described resonant element according to output current value and output capacitance value.
The Contactless power transmission device that the present embodiment proposes, by arranging multiple coil subelement in Contactless power transmission device, expands effective chargeable region in wireless charging device in spatial dimension.Contactless power transmission device is by detecting resonant element bringing onto load situation in real time, determine whether that load connects resonant element, if have, detect the state of multiple coil subelement, choose with by the corresponding coil subelement of charging device putting position for be charged by charging device, by the Contactless power transmission device using the present embodiment to provide, arbitrarily can be placed in any position of charged area by charging device and accurately need not aim at certain specific region, improve the degree of freedom of wireless charging, the validity of the convenience that charging system uses and wireless charging system.
One of the present embodiment preferred embodiment in, described power supply comprises further: DC power supply (not shown) and inverter circuit (not shown), the output of described DC power supply connects the input of described inverter circuit, the adjustment signal that described inverter circuit sends according to controller 13, adjustment running parameter, described running parameter comprises: inverter circuit phase shift and inverter circuit frequency, when resonant element 12 is in charged state, controller 13 controls the output current value that described current detection circuit measures resonant element 12, the parameter configuration table of inquiry storage inside, send inverter circuit adjustment running parameter described in adjustment signal controlling, wherein, the corresponding relation between current value and inverter circuit parameter is have recorded in described parameter configuration table.
The mapping table that as shown in table 1 is between a kind of current value range and inverter circuit parameter.
Table 1
| Current range | Inverter circuit phase shift | Inverter circuit frequency |
| 0～1A | 90° | 100KHz |
| 1A～2A | 90° | 105KHz |
| 2A～4A | -90° | 95KHz |
In the preferred embodiment, Contactless power transmission device is according to the measured value of current detection circuit, and inquiry empirical data, selects optimum circuit parameter to be that load is charged, and the maximizing efficiency achieving load exports.
Second embodiment
Fig. 3 is the flow chart of the wireless power transmission method of second embodiment of the invention.In the present embodiment, with the unmarked resonant element for charged state of fixed cycle scanning, the bringing onto load state of resonant element is judged.As shown in Figure 3, described method comprises:
Step 310, judge whether resonant element is labeled as charged state: if so, interval predetermined time, re-execute step 310; Otherwise, perform step 320.
In the present embodiment, after system energization, the state initialization of resonant element is labeled as uncharged state.
Exemplarily non-limiting, above-mentioned predetermined time can be set to 200ms, certainly, in actual applications, those skilled in the art can preset predetermined time size according to actual conditions.
Step 320, judge whether to search load: if so, perform step 330; Otherwise, interval predetermined time, re-execute step 310.
When passing through the capacitance search overhead measuring resonant element, controlling resonant element selection circuit and closing all coils subelement, if when the capacitance variations of resonant element can be detected, define load and connect resonant element;
When passing through the output current value search overhead measuring resonant element, controlling resonant element selection circuit and closing all coils subelement, if when the curent change of resonant element can be detected, define load and connect resonant element;
When passing through the output voltage values search overhead measuring resonant element, controlling resonant element selection circuit and closing all coils subelement, if when the change in voltage of resonant element can be detected, define load and connect resonant element;
When by telecommunication circuit search overhead, control resonant element selection circuit and close all coils subelement, if when load id information can be detected, define load and connect resonant element.
It can be the coil sub-cell identification of load charging in step 330, acquisition resonant element.
In the present embodiment, can by the method for control resonant element selection circuit successively closing coil subelement, or close the method for predetermined coil subelement successively by controlling resonant element selection circuit, obtaining in resonant element can be the coil sub-cell identification that load is charged.Wherein, the mark of the coil subelement of each position in resonant element is previously stored with.
Showing a kind of acquisition in resonant element at Fig. 4 can be the method flow diagram of the coil sub-cell identification of load charging.As shown in Figure 4, described method comprises:
Step 331A, according to coil sub-cell identification order read a coil sub-cell identification.
Step 332A, transmission closure signal, control the coil subelement corresponding with coil sub-cell identification and close in the given time.
Step 333A, judge whether to receive load id information: if so, perform step 334A; Otherwise, perform step 335A.
Step 334A, judge that this coil subelement can charge as load, obtain this coil sub-cell identification, perform step 335A.
Step 335A, judge that whether this coil sub-cell identification is last mark stored: if so, terminating acquisition can be load charge coil sub-cell identification step, otherwise, perform step 331A.
Exemplarily non-limiting, the scheduled time in step 332A can be set to 1s, 2s or 3s etc., certainly, in actual applications, those skilled in the art can preset the scheduled time length in step 332A according to actual conditions.
In the present embodiment, obtaining by using telecommunication circuit can be the coil sub-cell identification of load charging, avoid the mistake charging when putting into other metallic foreign bodies in the Contactless power transmission device charged to communication equipment, prevent the infringement of by mistake charging to metallic foreign body and Contactless power transmission device, improve the fail safe of Contactless power transmission device and the energy loss brought that by mistake charges.
Showing another kind of acquisition in resonant element at Fig. 5 can be the method flow diagram of the coil sub-cell identification of load charging.As shown in Figure 5, described method comprises:
Step 331B, predetermined coil subelement successively at short notice in closed resonant element, if judge, the output current value of resonant element and the difference of reference current value are greater than threshold value, and the coil subelement marking described selection is detecting unit.
Step 332B, coil subelement successively at short notice around the closed coil subelement being labeled as detecting unit in preset range, if judge, the output current value of resonant element and the difference of reference current value are greater than threshold value, and the coil subelement of Marker selection is detecting unit.
Step 333B, the successively closed coil subelement being labeled as detecting unit in the given time, if receive load id information, judge that the coil subelement selected is the coil subelement that can charge as load.
In the present embodiment, reference current value be resonant element not bringing onto load time, the current measurement value of closing coil within the identical scheduled time, this measured value prestores in the controller.
In the present embodiment, short time in step 331B and step 332B can be set to 0.1s according to actual, 0.2s or 0.5s etc., the scheduled time in step 333B can be set to 2s, 3s or 4s according to actual, certainly, in actual applications, those skilled in the art can preset according to the time span of actual conditions to short time and the scheduled time.
In the present embodiment, predetermined coil subelement in resonant element, and predetermined coil subelement can according to actual conditions free setting around predetermined coil subelement, setting principle is by selecting the least possible coil subelement, measures charged area large as far as possible.In actual applications, those skilled in the art can preset according to the position of actual conditions to coil subelement predetermined around predetermined coil subelement and predetermined coil subelement.
Exemplarily non-limiting, as shown in Figure 2, by label be 1 and 2 coil subelement be set as predetermined coil subelement, by label be the coil subelement of 1A, 1B and 1C be set as label be 1 coil subelement around coil subelement in preset range, by label be the coil subelement of 2A, 2B and 2C be set as label be 2 coil subelement around coil subelement in preset range.After the mark label coil subelement that is 1 is detecting unit, be judged as whether the coil subelement of label 1A, 1B and 1C is detecting unit successively.
In the present embodiment, being obtained in resonant element by the load id information in the output current of composite measurement resonant element and resonant element can be the coil sub-cell identification of load charging, greatly can reduce the acquisition time of coil sub-cell identification, in acquisition process, first detected roughly at short notice by current measurement circuit, after removing the coil subelement without the need to detecting, accurately obtain through telecommunication circuit can be load charging coil sub-cell identification, greatly reduce acquisition time; In addition, in resonant element, select predetermined coil subelement to detect by certain selection algorithm, reduce further acquisition time.
Step 340, send the closure signal corresponding with coil sub-cell identification to coil subelement selection circuit.
In the present embodiment, coil subelement selection circuit is the relay of multichannel, wherein the break-make of multicircuit relay, is controlled by low and high level signal.
Step 350, mark resonant element are charged state, return step 310.
The wireless power transmission method that the present embodiment proposes, by detecting resonant element bringing onto load situation in real time, determine whether that load connects resonant element, if have, choose with by the corresponding coil subelement of charging device putting position for be charged by charging device, by the wireless power transmission method using the present embodiment to provide, arbitrarily can be placed in any position of charged area by charging device and accurately need not aim at certain specific region, improve the degree of freedom of wireless charging, the convenience of charging system use and the validity of wireless charging system.
One of the present embodiment preferred embodiment in, when resonant element is in charged state, described method also comprises the connection load condition judged in resonant element, wherein, described connection load condition comprises: charging complete, move and shift out resonant element in resonant element, controller, according to the different conditions of described load, carries out different control to the coil subelement selection circuit in resonant element.
In the preferred embodiment, when resonant element is labeled as charged state, controller scans resonant element with the fixed cycle, judges the connection load condition of resonant element.
Exemplarily non-limiting, the above-mentioned fixed cycle can be set to 500ms, certainly, in actual applications, those skilled in the art can preset according to the size of actual conditions to the fixed cycle.
Fig. 6 is a kind of method flow diagram judging charging load state, and as shown in Figure 6, described method comprises:
Step 610, judge whether the current measurement value of resonant element declines in the given time: if so, perform step 630; Otherwise, perform step 620.
Step 620, judge connect load condition as charging normal.
Step 630, judge the measurement capacitance situation of change in the given time of resonant element: capacitance does not change, and performs step 640; Capacitance changes and does not change to empirical value, performs step 650; Capacitance changes and changes to empirical value, performs step 660.
In the present embodiment, the stopping of control power supply measures the output capacitance value of resonant element after powering to resonant element.
In the present embodiment, when electric capacity empirical value is not for connecting load, the output capacitance value of resonant element.Wherein, the electric capacity empirical value stored in controller is multiple: when being connected into two coil subelements in output capacitance value when being connected into a coil subelement in resonant element, resonant element output capacitance value ..., output capacitance value when being connected into whole coil subelement in resonant element, the coil subelement number that controller is connected into according to current resonant element, selects electric capacity empirical value corresponding with it to compare with measurement capacitance.
It is charging complete that step 640, judgement connect load condition, performs step 670.
In the preferred embodiment, when resonant element is in charged state, the communication data packet that can also send by receiving load judges whether load charges and has completed.
Step 650, judge connect load condition as moving in resonant element, execution step 680.
Step 660, judge connect load condition as shifting out described resonant element, perform step 690.
Step 670, transmission cut-off signal, to coil subelement selection circuit, control the connection disconnecting coil subelements all in resonant element.
The connection of coil subelements all in step 680, disconnection resonant element, again obtaining in resonant element can be the coil sub-cell identification that load is charged, and controlling the closed coil subelement that can charge for load be that described mobile back loading charges.
Step 690, removing resonant element charged state mark, disconnect the connection of coil subelements all in described resonant element.
One of the present embodiment preferred embodiment in, when described resonant element is in charged state, described method also comprises:
Measure the output current value of described resonant circuit;
The parameter configuration table of inquiry storage inside, sends adjustment signal controlling inverter circuit adjustment running parameter, wherein, have recorded the corresponding relation between current value and inverter circuit parameter in described parameter configuration table.
In the preferred embodiment, by detecting load connection status in wireless power transmission process, the different conditions according to load changes charging strategy, improves the flexibility of wireless communication system, has saved electric energy.
3rd embodiment
Fig. 7 be third embodiment of the invention can be the structural representation that the Contactless power transmission device charged is carried out in multi-load, as shown in Figure 7, a resonant element, on the basis of the first embodiment, is expanded at least two by described Contactless power transmission device.Described system comprises: power supply 71, resonant element selection circuit 72, first resonant element 73, second resonant element 74 ..., N resonant element 75, controller 76, telecommunication circuit 77, current measurement circuit 78 and capacitance measurement circuit 79.
Compared with embodiment one, load search unit in embodiment one is the capacitance measurement circuit 79 of the present embodiment, load orientation unit in embodiment one is telecommunication circuit 77 and the current measurement circuit 78 of the present embodiment, the Contactless power transmission device of the present embodiment also comprises a resonant element selection circuit 72, for connecting power supply 71 and multiple resonant element, controller 76 scans multiple resonant element successively, obtain the resonant element mark wherein connecting load, send and identify corresponding Continuity signal to resonant element selection circuit 72 with the resonant element connecting load, resonant element selection circuit 72 is according to Continuity signal, set up the connection of power supply 71 resonant element corresponding with Continuity signal.
In the present embodiment, resonant element selection circuit 72 can be the relay of multichannel or the electronic switch of multichannel.
Be understandable that, in the present embodiment, resonant element selection circuit 72 can also adopt other circuit that can realize variable connector control or variable connector chips, does not limit this.
One of the present embodiment preferred embodiment in, controller 76 is with the unmarked resonant element for charged state of fixed cycle scanning.
One of the present embodiment preferred embodiment in, when one or more in resonant element is in charged state, described method also comprises the connection load condition judged in resonant element, wherein, described connection load condition comprises: charging complete, move and shift out resonant element in resonant element, controller 76, according to the different conditions of described load, carries out different control to the coil subelement selection circuit in resonant element.
One of the present embodiment preferred embodiment in, controller 76 is also the number of the resonant element of charged state for recording mark, when the resonant element number that judge mark is charged state equals predetermined full load number, it is the resonant element of charged state that controller 76 stops scanning unmarked.
One of the present embodiment preferred embodiment in, power supply 71 comprises further: DC power supply (not shown) and multiple inverter circuit (not shown), wherein, the number of inverter circuit and the number one_to_one corresponding of resonant element, the output of DC power supply is connected with the input of multiple inverter circuit respectively, and multiple inverter circuit is connected with resonant element corresponding with it respectively by resonant element selection circuit.The adjustment signal that inverter circuit sends according to controller, adjustment running parameter, described running parameter comprises: inverter circuit phase shift and inverter circuit frequency.
The Contactless power transmission device that the present embodiment proposes, by the resonant element in Contactless power transmission device is expanded at least two, can realize carrying out wireless charging for multiple load simultaneously, achieve the wireless power transmission of one-to-many, extend the function of wireless communication system.
4th embodiment
Fig. 8 is the flow chart that can be the wireless power transmission method that multi-load is carried out charging of fourth embodiment of the invention, as shown in Figure 8, scanning resonant element, on the basis of the second embodiment, is expanded to scanning at least two resonant elements by described wireless power transmission method.Described method comprises:
Step 810, successively scanning one are labeled as uncharged resonant element.
Step 820, judge this resonant element whether bringing onto load: if so, perform step 830; Otherwise, return step 810.
Step 830, set up the connection of this resonant element and power supply.
Step 840, to obtain in this resonant element can be the coil sub-cell identification of load charging.
Step 850, send the closure signal corresponding with described coil sub-cell identification to coil subelement selection circuit.
Step 860, to mark this resonant element be charged state.
The wireless power transmission method that the present embodiment proposes, by scanning resonant element is expanded to scanning at least two resonant elements, the mode scanned by poll, achieves the wireless power transmission of one-to-many, extends the function of wireless communication system.
Note, above are only preferred embodiment of the present invention and institute's application technology principle.Skilled person in the art will appreciate that and the invention is not restricted to specific embodiment described here, various obvious change can be carried out for a person skilled in the art, readjust and substitute and can not protection scope of the present invention be departed from.Therefore, although be described in further detail invention has been by above embodiment, the present invention is not limited only to above embodiment, when not departing from the present invention's design, can also comprise other Equivalent embodiments more, and scope of the present invention is determined by appended right.
Claims (14)
1. a Contactless power transmission device, is characterized in that, comprising: power supply, resonant element, load search unit, load orientation unit and controller, and described resonant element comprises coil subelement selection circuit and at least two coil subelements,
Described power supply, for powering for described resonant element;
Described load search unit, for judging the bringing onto load state of described resonant element;
Described load orientation unit, can carry out for load the coil sub-cell identification that charges for determine in described resonant element;
Described controller is used for the bringing onto load state being judged described resonant element by described load search unit, when judging described resonant element bringing onto load, being obtained in described resonant element by described load orientation unit can be the coil sub-cell identification of load charging, send the closure signal corresponding with described coil sub-cell identification to described coil subelement selection circuit, and to mark described resonant element be charged state;
Described coil subelement selection circuit is according to described closure signal, and the closed coil subelement corresponding with described closure signal, charges to load.
2. Contactless power transmission device according to claim 1, it is characterized in that, described load orientation unit comprises further: current measurement circuit and telecommunication circuit, wherein, measurement result for measuring the output current value of described resonant element, and is sent to described controller by described current measurement circuit, and described telecommunication circuit is connected with described controller, for the information received is sent to described controller
Described controller is obtained in described resonant element can be comprised further for the coil sub-cell identification of load charging by described load orientation unit:
Described controller controls the predetermined coil subelement of described coil subelement selection circuit successively at short notice in closed described resonant element, if judge, the difference of the output current value that described current detection circuit is measured and reference current value is greater than threshold value, and the coil subelement marking described selection is detecting unit;
Close the coil subelement around the coil subelement being labeled as detecting unit in preset range successively at short notice, if judge, the difference of the output current value that described current detection circuit is measured and reference current value is greater than threshold value, and the coil subelement marking described selection is detecting unit;
The coil subelement of detecting unit is labeled as described in closing in the given time successively, if described telecommunication circuit receives load id information, judge that the coil subelement of described selection is the coil subelement that can charge as load, obtaining described can be the coil sub-cell identification that load is charged.
3. Contactless power transmission device according to claim 1 and 2, it is characterized in that, described device also comprises load condition determining unit, when described resonant element is in charged state, for judging the connection load condition in described resonant element, wherein, described connection load condition comprises: charging complete, move and shift out resonant element in resonant element:
When judging that described connection load condition is charging complete, described controller sends cut-off signal to described coil subelement selection circuit, described coil subelement selection circuit, according to described cut-off signal, disconnects the connection of coil subelements all in described resonant element;
When judging described connection load condition as moving in resonant element, described controller disconnects the connection of coil subelements all in described resonant element, again obtaining in described resonant element can be the coil sub-cell identification that load is charged, and the closed coil subelement that can charge for load be that described mobile back loading charges;
When judging described connection load condition as shifting out resonant element, the charged state mark of resonant element removed by described controller, disconnects the connection of coil subelements all in described resonant element.
4. Contactless power transmission device according to claim 3, it is characterized in that, described load condition determining unit comprises current measurement circuit and capacitance measurement circuit further, described current measurement circuit is for measuring the output current value of described resonant element, and measurement result is sent to described controller, measurement result for measuring the output capacitance value of described resonant element, and is sent to described controller by described capacitance measurement circuit; Described controller, with the fixed cycle successively trigger current testing circuit and capacitive detection circuit, to obtain the output current value and output capacitance value that foregoing circuit records, judges the connection load condition of described resonant element according to output current value and output capacitance value:
When described output current value declines within the predetermined time, and when described output capacitance value does not change within the predetermined time, described controller judges that described connection load condition is charging complete;
When described output current value declines within the predetermined time, and when described output capacitance value changes within the predetermined time and do not change to empirical value, described controller judges that described connection load condition as moving in resonant element;
When described output current value declines within the predetermined time, and when described output capacitance value changes within the predetermined time and changes to empirical value, described controller judges that described connection load condition is as shifting out described resonant element.
5. Contactless power transmission device according to claim 4, it is characterized in that, described power supply comprises further: DC power supply and inverter circuit, the output of described DC power supply connects the input of described inverter circuit, the adjustment signal that described inverter circuit sends according to described controller, adjustment running parameter, described running parameter comprises: inverter circuit phase shift and inverter circuit frequency, when described resonant element is in charged state, described controller controls the output current value that described current detection circuit measures described resonant circuit, the parameter configuration table of inquiry storage inside, send inverter circuit adjustment running parameter described in adjustment signal controlling, wherein, the corresponding relation between current value and inverter circuit parameter is have recorded in described parameter configuration table.
6. according to the Contactless power transmission device one of claim 1-4 Suo Shu, it is characterized in that, described device comprises at least two resonant elements, described device also comprises resonant element selection circuit, for connecting described power supply and described at least two resonant elements, the bringing onto load state of at least two resonant elements described in described controller judges successively, obtain the resonant element mark wherein connecting load, send and identify corresponding Continuity signal to described resonant element selection circuit with the resonant element of described connection load, described resonant element selection circuit is according to described Continuity signal, set up the connection of the described power supply resonant element corresponding with described Continuity signal.
7. Contactless power transmission device according to claim 6, it is characterized in that, described power supply comprises DC power supply and at least two inverter circuits further, wherein, the number of described inverter circuit is identical with the number of described resonant element, the input of at least two inverter circuits described in the output connection of described DC power supply, described at least two inverter circuits are connected with described at least two resonant elements respectively by described resonant element selection circuit.
8. a wireless power transmission method, is characterized in that, comprising:
S01, judge the bringing onto load state of resonant element;
S02, when judging resonant element bringing onto load, obtaining in described resonant element can be the coil sub-cell identification of load charging;
S03, send the closure signal corresponding with described coil sub-cell identification to coil subelement selection circuit;
S04, to mark described resonant element be charged state.
9. radio-circuit transmission method according to claim 8, is characterized in that, described step S02 comprises further:
Close the predetermined coil subelement in described resonant element successively at short notice, if judge, the output current value of described resonant element and the difference of reference current value are greater than threshold value, and the coil subelement marking described selection is detecting unit;
Close the coil subelement around the coil subelement being labeled as detecting unit in preset range successively at short notice, if judge, the output current value of described resonant element and the difference of reference current value are greater than threshold value, and the coil subelement marking described selection is detecting unit;
The coil subelement of detecting unit is labeled as described in closing in the given time successively, if receive load id information, judge that the coil subelement of described selection is the coil subelement that can charge as load, obtaining described can be the coil sub-cell identification that load is charged.
10. wireless power transmission method according to claim 8 or claim 9, it is characterized in that, when described resonant element is in charged state, described method also comprises the connection load condition judged in described resonant element, wherein, described connection load condition comprises: charging complete, move and shift out resonant element in resonant element:
When judging that described connection load condition is charging complete, sending cut-off signal to described coil subelement selection circuit, disconnecting the connection of coil subelements all in described resonant element;
When judging described connection load condition as moving in resonant element, disconnect the connection of coil subelements all in described resonant element, again obtaining in described resonant element can be the coil sub-cell identification that load is charged, and the closed coil subelement that can charge for load be that described mobile back loading charges;
When judging described connection load condition as shifting out resonant element, removing resonant element charged state mark, disconnecting the connection of coil subelements all in described resonant element.
11. wireless power transmission methods according to claim 10, it is characterized in that, connection load condition in the described resonant element of described judgement comprises, obtain output current value and the output capacitance value of described resonant element with the fixed cycle, judge the connection load condition of described resonant element according to described output current value and described output capacitance value:
When described output current value declines within the predetermined time, and when described output capacitance value does not change within the predetermined time, judge that connecting load condition is charging complete;
When described output current value declines within the predetermined time, and when described output capacitance value changes within the predetermined time and do not change to empirical value, judge to connect load condition as moving in resonant element;
When described output current value declines within the predetermined time, and when described output capacitance value changes within the predetermined time and changes to empirical value, judge to connect load condition as shifting out described resonant element.
12. wireless power transmission methods according to claim 11, is characterized in that, when described resonant element is in charged state, described method also comprises:
Measure the output current value of described resonant circuit;
The parameter configuration table of inquiry storage inside, sends adjustment signal controlling inverter circuit adjustment running parameter, wherein, have recorded the corresponding relation between current value and inverter circuit parameter in described parameter configuration table.
13., according to the wireless power transmission method one of claim 9-12 Suo Shu, is characterized in that, described step S01 comprises further:
The bringing onto load state of at least two resonant elements described in judging successively, obtains the resonant element mark wherein connecting load;
Send and identify corresponding Continuity signal to resonant element selection circuit with the resonant element of described connection load, set up the connection of the power supply resonant element corresponding with described Continuity signal.
14. 1 kinds of Wireless power transmission systems, is characterized in that, comprise the Contactless power transmission device as described in one of claim 1-7 and wireless power receiving system.
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