CN101335468A - Power transmission control device, power transmission device, electronic instrument, and non-contact power transmission system - Google Patents

Power transmission control device, power transmission device, electronic instrument, and non-contact power transmission system Download PDF

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Publication number
CN101335468A
CN101335468A CNA2008101276117A CN200810127611A CN101335468A CN 101335468 A CN101335468 A CN 101335468A CN A2008101276117 A CNA2008101276117 A CN A2008101276117A CN 200810127611 A CN200810127611 A CN 200810127611A CN 101335468 A CN101335468 A CN 101335468A
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circuit
signal
power transmission
waveform
drive clock
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CN101335468B (en
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饭坂健
神干基
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Chamiri Management Co., Ltd.
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Seiko Epson Corp
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Abstract

The present invention provides a power transmission control device, a power transmission device, and the like which can improve the precision for the foreign object detection. A power transmission control device provided in a power transmission device of a non-contact power transmission system comprises a drive clock signal generation circuit (25) that generates a drive clock signal DRCK specifying a drive frequency of a primary coil, a driver control circuit (26) that generates a driver control signal based on the drive clock signal DRCK and outputs the driver control signal to a transmission driver, a waveform detection circuit (30) that detects a change in waveform of an induced voltage signal PHIN of the primary coil L1, and a control circuit (20) that performs foreign object detection based on a detection result of the waveform detection circuit (30). Wherein, the drive clock signal generation circuit (25) outputs the drive clock signal DRCK set at a foreign object detection frequency F2 during foreign object detection, the foreign object detection frequency being a frequency differing from a normal power transmission frequency.

Description

Power transmission control device, power transmission device, electronic equipment and non-contact power transmitting system
Technical field
The present invention relates to a kind of power transmission control device, power transmission device, electronic equipment and non-contact power transmitting system.
Background technology
In recent years, even the contactless contactless electric power that also can utilize electromagnetic induction to carry out electric power transfer of metal part carries (noncontact electric power transfer) noticeable.As the application examples of this contactless electric power transfer, people have proposed charging of mobile phone, household electrical appliance (for example handset of telephone set) etc.
The prior art that patent documentation 1 is carried as contactless electric power.In this patent documentation 1, power transmission device (primary side) monitor the induced voltage signal of primary coil peak value, compare by threshold voltage with regulation, detect the load condition that is subjected to electric side, realize that metallic foreign body detects.
But, in the prior art of this patent documentation 1, the driving frequency of coil is often fixed, and needn't change driving frequency.Therefore, existence can not further improve the problem of the precision of foreign matter detection.
Patent documentation 1: TOHKEMY 2006-60909 communique
Summary of the invention
The present invention is in view of above-mentioned technical task, and its purpose is to provide power transmission control device, power transmission device, electronic equipment and the non-contact power transmitting system of the precision that can improve the foreign matter detection.
The power transmission control device that the present invention relates to, be arranged on make primary coil and secondary coil electromagnetic coupled and from power transmission device on current-collecting device transferring electric power and described power transmission device to the non-contact power transmitting system of the load supply capability of described current-collecting device, it is characterized in that, comprise: drive clock pulse generation circuit, the drive clock pulse that is used to generate the driving frequency of the described primary coil of the regulation line output of going forward side by side; Driver control circuit generates the driver control signal based on described drive clock pulse, and exports to the electric drive that send that drives described primary coil; Waveform detection circuit is used to detect the wave form varies of the induced voltage signal of described primary coil; And control circuit, based on the testing result in described waveform detection circuit, carrying out foreign matter detects, wherein, described drive clock pulse generation circuit is when foreign matter detects, export described drive clock pulse, described drive clock pulse be set with send usually electricity with the different frequency of frequency, be foreign matter detection frequency.
According to the present invention, the drive clock pulse generation circuit generates the drive clock pulse and the output of regulation driving frequency, and driver control circuit generates the driver control signal based on this drive clock pulse and exports to and send electric drive.And among the present invention in this case, output is set and is sent the electricity drive clock pulse of the different foreign matter detection of frequency with frequency usually when foreign matter detects.And, like this, being set to foreign matter in the drive clock pulse and detecting with under the state of frequency, waveform detection circuit detects the wave form varies of the induced voltage signal of primary coil, and control circuit carries out foreign matter based on its testing result and detects.In view of the above, use driving frequencies different when sending electricity usually to carry out foreign matter and detect, can improve the foreign matter accuracy of detection.
In addition, in the present invention, described drive clock pulse generation circuit can be exported described drive clock pulse when foreign matter detects, described drive clock pulse be set to described send usually electricity with the frequency between frequency and the coil resonance frequency, be that foreign matter detects the usefulness frequency.
According to this formation, when detecting, foreign matter compares when sending electricity usually, and driving frequency approaches the coil resonance frequency.Based on this, the wave distortion of induced voltage signal can make the big change of waveform with few load change, improves the foreign matter accuracy of detection.
In addition, in the present invention, described waveform detection circuit comprises the pulse width detection circuit of the pulse width information that is used to detect induced voltage signal, and described control circuit can carry out foreign matter based on described pulse width information and detect.
According to this formation, individually do not detect voltage, electric current even do not adopt, the method so that its phase difference is judged also can realize that stable foreign matter detects with simple formation.
In addition, in the present invention, described waveform detection circuit can comprise first pulse width detection circuit, first pulse width detection circuit first induced voltage signal with described primary coil begin from the low potential power source side to change and the timing that exceeds first threshold voltage as first regularly the situation under, first edge of measuring described drive clock pulse regularly and described first between regularly during, promptly during first pulsewidth, and detecting first pulse width information, described control circuit carries out foreign matter based on described first pulse width information and detects.
According to the present invention, first edge of measuring the drive clock pulse regularly (for example, trailing edge regularly or rising edge regularly) and first between regularly during, promptly during first pulsewidth, be detected as first pulse width information.And, carry out foreign matter based on first pulse width information that is detected and detect.In view of the above, individually do not detect voltage, electric current,, can realize that stable foreign matter detects yet with the method that its phase difference is judged even do not adopt.In addition, in the present invention, first regularly owing to be that first induced voltage signal begins to change and surpass the timing of first threshold voltage from the low potential power source side, detects so can realize the few pulsewidth of deviation when changes such as supply voltage.
In addition, in the present invention, described waveform detection circuit comprises first waveform shaping circuit, described first waveform shaping circuit carries out waveform shaping to described first induced voltage signal, and export the first waveform shaping signal, described first pulse width detection circuit based on described first waveform shaping signal and described first pulsewidth of described drive clock impulsive measurement during.
In view of the above, can use by first waveform shaping circuit by the signal of waveform shaping and drive clock pulse, measure first pulsewidth by digital processing during.
In addition, in the present invention, described first pulse width detection circuit comprises first counter, and described first counter carries out the increment or the decrement of count value during described first pulsewidth, and based on resulting count value, measures the length during described first pulsewidth.
In view of the above, can use first counter to measure first pulsewidth exactly by digital processing during.
In addition, in the present invention, described first pulse width detection circuit can comprise first and allow signal generating circuit, described first allows signal generating circuit to accept described first waveform shaping signal and described drive clock pulse, generate the first permission signal that is in enabled state during described first pulsewidth, described first counter carries out the increment or the decrement of count value when described first allows signal to be in enabled state.
In view of the above, only generate the first counting processing that allows signal just can control to be used to count during the pulsewidth, can oversimplify processing.
In addition, in the present invention, described first allows signal generating circuit to comprise first circuits for triggering, described first circuits for triggering have described drive clock pulse in input on its clock pulse terminal, input has high potential power voltage or low potential power source voltage on its digital terminal, and input has the described first waveform shaping signal on its reseting terminal or set terminal.
In view of the above, can realize allowing the generation of signal with the simple formation that first circuits for triggering only are set.
In addition, in the present invention, described control circuit send usually based on described first pulse width information and establishes preceding foreign matter detection of beginning, i.e. a foreign matter detection by cable.
In view of the above, can send usually before establishing the beginning by cable such as realizing a foreign matter detection under the no-load condition.
In addition, in the present invention, described waveform detection circuit comprise described second pulse width detection circuit of second pulse width detection circuit second induced voltage signal with described primary coil begin from the high potential power side to change and the timing that is lower than second threshold voltage as second regularly the situation under, second edge of measuring described drive clock pulse regularly and described second between regularly during, promptly during second pulsewidth, and detecting second pulse width information, described control circuit send the foreign matter of establishing by cable after the beginning to detect, be that the secondary foreign matter detects based on described second pulse width information usually.
In view of the above, can send usually establish the beginning by cable before and send usually and establish beginning back by cable, precision, the stability of the detection of raising foreign matter with different benchmaring foreign matters.
In addition, in the present invention, described waveform detection circuit can comprise second waveform shaping circuit, described second waveform shaping circuit carries out waveform shaping to described second induced voltage signal, and export the second waveform shaping signal, described second pulse width detection circuit based on described second waveform shaping signal and described second pulsewidth of described drive clock impulsive measurement during.
In view of the above, can use by second waveform shaping circuit by the signal of waveform shaping and drive clock pulse, measure second pulsewidth by digital processing during.
In addition, in the present invention, described second pulse width detection circuit comprises second counter, and described second counter carries out the increment or the decrement of count value during described second pulsewidth, and measures length during described second pulsewidth based on resulting count value.
In view of the above, can use the measuring exactly during second pulsewidth of second counter number.
In addition, in the present invention, described waveform detection circuit comprises first waveform shaping circuit, described first waveform shaping circuit carries out waveform shaping to described first induced voltage signal, and the first waveform shaping signal exported to described first pulse width detection circuit, described second waveform shaping circuit pair described second induced voltage signal different with described first induced voltage signal carries out waveform shaping, and the described second waveform shaping signal is exported to described second pulse width detection circuit.
In view of the above, in first mode and second mode with second waveform shaping circuit and second pulse width detection circuit with first waveform shaping circuit and first pulse width detection circuit, can realize that pulsewidth detects, and improves precision, stability that pulsewidth detects by first, second different induced voltage signal of enough signal conditions.
In addition, the present invention relates to a kind of power transmission device, comprise above-mentioned any described power transmission control device and generate alternating voltage and supply with to the electric portion of sending of described primary coil.
In addition, the present invention relates to a kind of electronic equipment, comprise above-mentioned described power transmission device.
In addition, the present invention relates to a kind of non-contact power transmitting system, comprise power transmission device and current-collecting device, carry out electric power transfer and to the load supply capability of described current-collecting device from described power transmission device to described current-collecting device by making primary coil and secondary coil electromagnetic coupled, it is characterized in that, described current-collecting device comprises the power receiving section that the induced voltage of described secondary coil is converted to direct voltage, described power transmission device comprises: the drive clock pulse generation circuit, be used to generate the drive clock pulse of the driving frequency of stipulating described primary coil, the line output of going forward side by side; Driver control circuit generates the driver control signal based on described drive clock pulse, and exports to the electric drive that send that drives described primary coil; Waveform detection circuit is used to detect the wave form varies of the induced voltage signal of described primary coil; And control circuit, based on the testing result in described waveform detection circuit, carrying out foreign matter detects, wherein, described drive clock pulse generation circuit is when foreign matter detects, export described drive clock pulse, described drive clock pulse be set to send usually electricity with the different frequency of frequency, be foreign matter detection frequency.
Description of drawings
Fig. 1 (A), Fig. 1 (B) are the key diagrams of contactless electric power transfer.
Fig. 2 is power transmission device, power transmission control device, the current-collecting device of present embodiment and the configuration example that is subjected to controller for electric consumption.
Fig. 3 (A), Fig. 3 (B) are the key diagrams by the data transmission of frequency modulation(FM), load-modulate.
Fig. 4 is the flow chart that is used for sending electric side and the summary that is subjected to the action of electric side to describe.
Fig. 5 is the configuration example of the power transmission control device of present embodiment.
Fig. 6 (A) is the key diagram of the frequency setting method of present embodiment to Fig. 6 (C).
Fig. 7 is the configuration example of first variation of present embodiment.
Fig. 8 (A) is the measurement result that is used to the signal waveform that the pulsewidth of first mode that illustrates detects to Fig. 8 (C).
When Fig. 9 (A) is non-loaded to Fig. 9 (C), the equivalent electric circuit when load is arranged and resonance characteristic figure.
Figure 10 is the concrete configuration example of first variation.
Figure 11 is the signal waveform example that is used to illustrate the action of first variation.
Figure 12 is the configuration example of second variation of present embodiment.
Figure 13 be (A) to Figure 13 (C) be the measurement result that is used to the signal waveform that the pulsewidth of second mode that illustrates detects.
Figure 14 (A), Figure 14 (B) are the figure that is used to illustrate the deviation that the pulsewidth based on power supply voltage variation detects.
Figure 15 is used for foreign matter detection, a secondary foreign matter are detected the flow chart that describes.
Figure 16 is the concrete configuration example of second variation.
Figure 17 is the signal waveform example that is used to illustrate the action of second variation.
Figure 18 is the configuration example of the 3rd variation of present embodiment.
Embodiment
Below the preferred embodiments of the present invention are described in detail.In addition, below Shuo Ming embodiment is not the unreasonable qualification to the content of putting down in writing in claims of the present invention, and the whole of the formation that illustrates among the embodiment may not be essential features of the present invention.
1, electronic equipment
Fig. 1 (A) illustrates the example of the electronic equipment of the contactless electric power transfer method that is suitable for present embodiment.Charger 500 (cradel, carriage) as one of electronic equipment has power transmission device 10.And, have current-collecting device 40 as the mobile phone 510 of one of electronic equipment.And, operating portion 514, microphone 516 (sound input part), loud speaker 518 (audio output unit) and antenna 520 that mobile phone 510 has the display part 512 of LCD etc., is made of button etc.
In charger 500, by AC transducer 502 supply capabilities, this electric power utilizes contactless electric power transfer to be sent to current-collecting device 40 from power transmission device 10.Based on this, can give the charge in batteries of mobile phone 510, make the equipment work in the mobile phone 510.
In addition, the electronic equipment of suitable present embodiment is not limited only to mobile phone 510.For example, also can be applied to the various electronic equipments of wrist-watch, cordless telephone, electric shaver, electric toothbrush, tabulation computer, portable terminal device, personal digital assistant device, electric bicycle or IC-card etc.
Illustrate from power transmission device 10 as mould among Fig. 1 (B) is by making primary coil L1 (sending electric coil) that power transmission device 10 sides are provided with and secondary coil L2 (the being subjected to electric coil) electromagnetic coupled that is provided with in current-collecting device 40 sides to the electric power transfer of current-collecting device 40 with showing, and forms that the electric power transfer transformer realizes.Realize non-contacting electric power transfer with the method.
2, power transmission device, current-collecting device
The power transmission device 10 of present embodiment shown in Figure 2, power transmission control device 20, current-collecting device 40 and be subjected to the configuration example of controller for electric consumption 50.The electronic equipment that send electric side of charger 500 grades of Fig. 1 (A) comprises the power transmission device 10 of Fig. 2.In addition, the electronic equipment that is subjected to electric side of mobile phone 510 grades can comprise current-collecting device 40 and load 90 (this load).And, formation according to Fig. 2, realize contactless electric power transfer (noncontact electric power transfer) system, make primary coil L1 and secondary coil L2 electromagnetic coupled such as planar coil, and from power transmission device 10 to current-collecting device 40 transferring electric powers, from the voltage output node NB7 of current-collecting device 40 to load 90 supply capabilities (voltage VOUT).
Power transmission device 10 (sending electric module, former module) can comprise primary coil L1, send electric portion 12, waveform monitoring circuit 14, display part 16 and power transmission control device 20.In addition, power transmission device 10 and power transmission control device 20 are not limited to the formation of Fig. 2, can be that the part of its inscape is omitted (for example display part and waveform monitoring circuit), or add other inscape, change various distortion enforcements such as annexation.
The alternating voltage that send electric portion 12 to generate assigned frequency when electric power transfer, the alternating voltage different according to the data generated frequency when data passes supplied with and given primary coil L1.Concrete shown in Fig. 3 (A), such as the alternating voltage as generated frequency f1 when current-collecting device 40 sends data " 1 ", the alternating voltage of generated frequency f2 when sending data " 0 ".This send electric portion 12 to include to drive first the sending electric drive, drive second the sending electric drive and constitute at least one electric capacity of resonant circuit jointly with primary coil L1 of the other end of primary coil L1 an of end of primary coil L1.
And it all is such as the phase inverter that is made of power MOS transistor (buffer circuit) that first, second that send that electric portion 12 contains send electric drive, by driver control circuit 26 controls of power transmission control device 20.
Primary coil L1 (sending electric lateral coil) forms the electric power transfer transformer with secondary coil L2 (being subjected to electric lateral coil) electromagnetic coupled.For example, when the needs electric power transfer, shown in Fig. 1 (A), Fig. 1 (B), place mobile phone 510 on charger 500, the magnetic flux that becomes primary coil L1 passes the state of secondary coil L2.On the other hand, when not needing electric power transfer, with mobile phone 510 and charger 500 physical separation, the magnetic flux that becomes primary coil L1 does not pass the state of secondary coil L2.
Waveform monitoring circuit 14 (rectification circuit, waveform shaping circuit) generates the induced voltage signal PHIN that waveform monitors usefulness based on the coil-end signal CSG of primary coil L1.For example, as the maximum rated voltage that the coil-end signal CSG of the induced voltage signal of primary coil L1 has surpassed the IC of power transmission control device 20, become negative voltage.Waveform monitoring circuit 14 is accepted such coil-end signal CSG, the waveform detection circuit 30 of generation by power transmission control device 20 can waveforms detection signal, be the induced voltage signal PHIN that waveform monitors usefulness, export to monitoring of power transmission control device 20 and use terminal such as waveform.Specifically, waveform monitoring circuit 14 carries out voltage is carried out the restraint of labour of clamper so that be no more than maximum rated voltage, or carries out halfwave rectifier so that do not apply negative voltage on power transmission control device 20.Waveform monitor circuit 14 can comprise the resistance of the necessity that is used for restraint of labour, halfwave rectifier and electric current restriction and diode etc. for this reason.For example, by the bleeder circuit that constitutes by a plurality of resistance with coil-end signal CSG dividing potential drop, or, export to power transmission control device 20 as induced voltage signal PHIN by the diode halfwave rectifier.
Display part 16 is the device of the various states that show non-contact power transmitting systems with color, image etc. (in the electric power transfer, ID authentication etc.), for example, utilize realizations such as LED, LCD.
Power transmission control device 20 is the device that carries out the various controls of power transmission device 10, can pass through integrated circuit (IC) apparatus realizations such as (IC).This power transmission control device 20 can include control circuit 22 (sending electric side), oscillating circuit 24, drive clock pulse generation circuit 25, driver control circuit 26 and waveform detection circuit 30.In addition, also can omit the part of these inscapes, or the distortion of additional other inscapes etc. is implemented.
The control circuit 22 (control part) that send electric side is the circuit that carries out the control of power transmission device 10 and power transmission control device 20, for example, can be by realizations such as gate array and microcomputers.Specifically, control circuit 22 carries out electric power transfer, load condition detects required various sequences controls and judgment processing such as (Data Detection, foreign matter detect, load and unload detection etc.) and frequency modulation.
Oscillating circuit 24 generates the clock pulse of primary side (primary coil side) by constituting such as crystal oscillating circuit.Drive clock pulse generation circuit 25 generates the drive clock pulse of regulation driving frequency.And, driver control circuit 26 is based on this drive clock pulse and be derived from frequency setting signal of control circuit 22 etc., generate the control signal of the frequency of expection, and send electric drive output, control first, second and send electric drive to first, second that send electric portion 12.
Waveform detection circuit 30 detects the wave form varies of the induced voltage signal PHIN of primary coil L1.For example, when the load condition that is subjected to electric side (primary side) (load current) changes, then the waveform of induced voltage signal PHIN changes.Waveform detection circuit 30 detects the variation of such waveform, and testing result (testing result information) is exported to control circuit 22.
Specifically, waveform detection circuit 30 generates the waveform shaping signal such as induced voltage signal PHIN is carried out waveform shaping.For example, when signal PHIN surpasses given threshold voltage, generate the waveform shaping signal (pulse signal) of the rectangular wave (square wave) that is in (activation) state that enables (for example, H level).And waveform detection circuit 30 goes out the pulse width information (during the pulsewidth) of waveform reshaping signal based on waveform shaping signal and drive clock pulse detection.Specifically, accept the waveform shaping signal and,, detect the pulse width information of induced voltage signal PHIN by detecting the pulse width information of waveform shaping signal from the drive clock pulse of drive clock pulse generation circuit 25.
Control circuit 22 detects the load condition (height of load change, load) that is subjected to electric side (current-collecting device 40 sides) based on the testing result of waveform detection circuit 30.Specifically,, detect the load condition that is subjected to electric side, for example, carry out that data (load) detect, foreign matter (metal) detects and loading and unloading (set up and unload) detect etc. based on detected pulse width information in waveform detection circuit 30 (pulse width detection circuit).That is, as during the pulsewidth of the pulse width information of induced voltage signal according to changed by the variation of the load condition of electric side.Control circuit 22 based on this pulsewidth during (by the count value that measures during the pulsewidth) detect the load change be subjected to electric side.Based on this, shown in Fig. 3 (B), the load-modulate portion 46 of current-collecting device 40 can detect this transmission data when sending data by load-modulate.
Current-collecting device 40 (being subjected to electric module, secondary module) can include secondary coil L2, power receiving section 42, load-modulate portion 46, power supply control part 48 and be subjected to controller for electric consumption 50.In addition, current-collecting device 40 and be subjected to controller for electric consumption 50 to be not limited to the formation of Fig. 2 can omit the part of its inscape, or additional other inscape, and the various distortion that change annexation etc. are implemented.
Power receiving section 42 is converted to direct voltage with the induced voltage of the interchange of secondary coil L2.This conversion is that the rectification circuit 43 that utilizes power receiving section 42 to have carries out.This rectification circuit 43 comprises diode DB1～DB4.Diode DB1 is arranged between the generation node NB3 of the node NB1 of secondary coil L2 one end and direct voltage VDC, DB2 is arranged between the node NB2 of the other end of node NB3 and secondary coil L2, DB3 is arranged between the node NB4 of node NB2 and VSS, and DB4 is arranged between node NB4 and the NB1.
The resistance R B1 of power receiving section 42, RB2 are arranged between node NB1 and the NB4.And, be transfused to the frequency detection circuit 60 that is subjected to controller for electric consumption 50 by utilizing resistance R B1, RB2 that the voltage between node NB1, NB4 is carried out dividing potential drop gained signal CCMPI.
The capacitor C B1 of power receiving section 42 and resistance R B4, RB5 are set between the node NB4 of the node NB3 of direct voltage VDC and VSS.And, by utilizing resistance R B4, RB5 the signal ADIN that the voltage between node NB3, NB4 carries out the dividing potential drop gained is transfused to the position detecting circuit 56 that is subjected to controller for electric consumption 50.
Load-modulate portion 46 carries out load-modulate and handles.Specifically, from current-collecting device 40 when power transmission device 10 sends the data of expection, according to sending data the load in load-modulate portion 46 (primary side) is changed changeably, shown in Fig. 3 (B), the signal waveform of the induced voltage of primary coil L1 is changed.Therefore, load-modulate portion 46 comprises series connection and is arranged on resistance R B3, transistor T B3 (the CMOS transistor of N type) between node NB3, NB4.The signal P3Q that this transistor T B3 is sent by the control circuit 52 that is subjected to controller for electric consumption 50 carries out conducting, ends control.And in conducting, when carrying out load-modulate by oxide-semiconductor control transistors TB3, the transistor T B2 of power supply control part 48 is cut off, and load 90 is in the state that is not electrically connected with current-collecting device 40.
For example, shown in Fig. 3 (B), when when sending data " 0 " to make primary side be low load (impedance is big), signal P3Q is the L level, transistor T B3 is a cut-off state.According to said method, the load of load-modulate portion 46 becomes almost infinitely great (non-loaded).On the contrary, when making primary side be high capacity (impedance is little) for transmission data " 1 ", signal P3Q is the H level, and transistor T B3 is a conducting state.According to said method, the load of load-modulate portion 46 becomes resistance R B3 (high capacity).
48 controls of power supply control part are supplied with to the electric power of load 90.Adjuster 49 is adjusted the voltage level of the direct voltage VDC that obtains by the conversion in rectification circuit 43, generates supply voltage VD5 (for example, 5V).Be subjected to controller for electric consumption 50 such as being supplied to this supply voltage VD5 and having carried out work.
Transistor T B2 (the CMOS transistor of P type) is controlled by the signal P1Q from the control circuit 52 that is subjected to controller for electric consumption 50.Specifically, transistor T B2 becomes conducting state when the electric power transfer that works normal is gone forward side by side in (determining) ID authentication finishing, and becomes cut-off state when load-modulate etc.
Being subjected to controller for electric consumption 50 is the devices that carry out the various controls of current-collecting device 40, can utilize integrated circuit (IC) apparatus (IC) to wait and realize.This is subjected to controller for electric consumption 50 can utilize the supply voltage VD5 that is generated by the induced voltage of secondary coil L2 to carry out work.In addition, be subjected to controller for electric consumption 50 can comprise control circuit 52 (being subjected to electric side), position detecting circuit 56, oscillating circuit 58, frequency detection circuit 60 and be full of power detection circuit 62.
Control circuit 52 (control part) is control current-collecting device 40 and the circuit that is subjected to controller for electric consumption 50, for example can utilize gate array and microcomputer to wait and realize.Specifically, control circuit 52 carries out ID authentication, position probing, frequency detecting, load-modulate or is full of required various sequential controls (sequence control) and determination processing such as electro-detection.
Position detecting circuit 56 monitors the waveform of signal ADIN of the waveform of the induced voltage that is equivalent to secondary coil L2, judges whether appropriate the position of primary coil L1 and secondary coil L2 concerns.Specifically, in comparator, signal ADIN is converted to 2 values or is converted to 2 values and carry out level and judge, judge whether its position relation is appropriate with A/D.
Oscillating circuit 58 for example is made of the CR oscillating circuit, generates the clock pulse of primary side.The frequency of frequency detection circuit 60 detection signal CCMPI (f1, f2) shown in Fig. 3 (A), and judges that the transmission data of being sent by power transmission device 10 are " 1 " or " 0 ".
Being full of power detection circuit 62 (charging testing circuit) is whether the storage battery 94 (secondary cell) that detects load 90 becomes the circuit that is full of electricity condition (charged state).
Load 90 can comprise the battery charge controller 92 of charging control of carrying out storage battery 94 etc.This battery charge controller 92 (charging control IC) can be by realizations such as integrated circuit (IC) apparatus.In addition, can make storage battery 94 that the function of battery charge controller 92 is arranged itself as intelligent battery.
Then, with the flow chart of Fig. 4 to sending electric side and described by the summary of the action of electric side.When sending electric side power connection to switch on (step S1), carry out the temporary transient electric power transfer (step S2) that position probing is used.By this electric power transfer, risen by the supply voltage of electric side, remove reset (the step S11) that is subjected to controller for electric consumption 50.So be subjected to electric side that signal P1Q is set at H level (step S12).Based on this, transistor T B2 is in cut-off state, being electrically connected between partition and the load 90.
Then, be subjected to electric side to utilize position relation that position detecting circuit 56 judges primary coil L1 and secondary coil L2 whether appropriate (step S13).And, concern in the position when appropriate, be subjected to electric side to begin the authentication processing of ID and authentication frame sent to send electric side (step S14).Specifically, send the data of authentication frame by the load-modulate of explanation in Fig. 3 (B).
When sending electric side joint to receive authentication frame, carry out the whether judgment processing (step S3) of unanimity etc. of ID.And, when allowing the ID authentication, will allow frame to being subjected to electric side to send (step S4).Specifically, the frequency modulation(FM) by explanation in Fig. 3 (A) sends data.
Be subjected to electric side joint to be allowed frame, when its content was OK, the startup frame that will be used to begin contactless electric power transfer sent to and send electric side (step S15, S16).On the other hand, send electric side joint to be started frame, when its content is OK, begin common electric power transfer (step S5, S6).And, be subjected to electric side that signal P1Q is set at L level (step S17).Based on this, because transistor T B2 becomes conducting simultaneously, so can carry out electric power transfer to load 90, beginning is supplied with (output of VOUT) (step S18) to the electric power of load.
3. foreign matter detects and uses frequency
The configuration example of the power transmission control device 20 of present embodiment shown in Figure 5.In addition, the power transmission control device 20 of present embodiment is not limited to the formation of Fig. 5, can be a part of omitting its inscape (for example, waveform monitoring circuit), or additional other the various distortion of inscape etc. is implemented.
In Fig. 5, drive clock pulse generation circuit 25 generates the drive clock pulsed D RCK of the driving frequency of regulation primary coil L1.Specifically, the reference clock pulse CLK that generates is carried out frequency division in oscillating circuit 24, generate drive clock pulsed D RCK.The alternating voltage of the driving frequency of this drive clock pulsed D RCK is fed among primary coil L1.
Driver control circuit 26 generates the driver control signal based on drive clock pulsed D RCK, exports to the electric drive (first, second send electric drive) that send that send electric portion 12 that drives primary coil L1.At this moment, generate the driver control signal so that be input to the signal of grid of P transistor npn npn of phase inverter and the signal that is input to the grid of N transistor npn npn becomes non-overlapped signal mutually, stream has perforation electric current so that send in the phase inverter of electric drive not in formation.
Waveform detection circuit 30 detects the wave form varies of the induced voltage signal PHIN of primary coil L1.And control circuit 22 carries out foreign matter based on the testing result of waveform detection circuit 30 and detects.
For example, waveform detection circuit 30 detects the pulse width information of induced voltage signal PHIN.And control circuit 22 carries out foreign matter based on detected pulse width information and detects.Specifically, waveform detection circuit 30 detects pulse width information by the pulsewidth detection method of first mode described later, carries out foreign matter according to this pulse width information and detects.For example, by measure regularly begin to rise and surpass the pulsewidth of timing of given threshold voltage from the edge of drive clock pulse to induced voltage signal PHIN (coil-end signal CSG) during, detect foreign matter.
In addition, waveform detection circuit 30 utilizes the pulsewidth detection method of second mode described later by detecting pulse width information, can detect foreign matter.For example, by measure regularly begin to descend and be lower than the pulsewidth of timing of given threshold voltage from the edge of drive clock pulse to induced voltage signal PHIN (coil-end signal CSG) during, detect foreign matter.
In addition, the both sides' that waveform detection circuit 30 can be by carrying out first mode and second mode pulsewidth detects foreign matter.For example, can carry out foreign matter in first mode before establishing the beginning by cable and detect sending usually, establish the beginning back by cable and carry out the foreign matter detection sending usually in second mode.
In addition, waveform detection circuit 30 can detect foreign matter by the method according to the load judgment phase characteristic.For example, can by detect voltage, current and phase difference detects foreign matter.Maybe can monitor the peak value of induced voltage signal PHIN, by the change-detection foreign matter of detection peak.
And, in the present embodiment, when such foreign matter detects (between the foreign matter detection period, foreign matter detecting pattern), with drive clock pulsed D RCK (comprising signal) with drive clock pulse equivalence be set at send usually electricity with the different frequency of frequency F1, be foreign matter detection frequency F2.Specifically, when foreign matter detects (for example, when foreign matter detects), control circuit 22 is to the change index signal of drive clock pulse generation circuit 25 output driving frequencies.So drive clock pulse generation circuit 25 generates when foreign matter detects and is set to foreign matter and detects drive clock pulsed D RCK with the frequency F2 line output of going forward side by side.For example, by changing frequency dividing ratio to reference clock pulse CLK, driving frequency is changed into foreign matter detection frequency F2 from sending electricity usually with frequency F1, the drive clock pulsed D RCK of frequency F2 is exported to driver control circuit 26.And, the driver control signal of driver control circuit 26 generated frequency F2, electric drive is sent in control.And foreign matter in this case detects with frequency F2 such as being set at the frequency of sending usually between electric frequency F1 of using and the coil resonance frequency F0.
For example, shown in Fig. 6 (A) when the load that is subjected to electric side (primary side) is low the signal waveform example of the coil-end signal CSG of (load current hour), shown in Fig. 6 (B) when the load that is subjected to electric side is high the signal waveform example of the coil-end signal CSG of (when load current is big).Shown in Fig. 6 (A), Fig. 6 (B), along with the load that is subjected to electric side uprises, the wave distortion of coil-end signal CSG.
Specifically, as described later, when the low load of Fig. 6 (A), be in the master control status with comparing as the sine wave of coil resonance waveform as the rectangular wave of drive waveforms (waveform of DRCK).On the other hand, when becoming high capacity, then be in master control status, wave distortion with comparing as Fig. 6 (B) as the square wave of drive waveforms as the sine wave of harmonic wave.
And, in the pulsewidth detection method of first mode described later, shown in Fig. 6 (B), XTPW1 during the pulsewidth when detecting the rising of coil-end signal CSG, thus detect the load change that inserts along with foreign matter.In addition, in the pulsewidth detection method of second mode, XTPW2 during the pulsewidth when detecting the decline of coil-end signal CSG, thus detect the load change that inserts along with foreign matter.Promptly in Fig. 6 (B), be changed to the signal waveform of sinusoidal wave master control from the signal waveform of rectangular wave master control, thereby detect the load change that inserts along with foreign matter by detecting coil-end signal CSG.
And, in the present embodiment, when such foreign matter detects, shown in Fig. 6 (C), be set at and send usually electric the detection to use frequency F2 driving frequency with the different foreign matter of frequency F1.Specifically, be set at and send electricity with the frequency F2 between frequency F1 and the coil resonance frequency F0 (resonance frequency of the resonant circuit that constitutes by coil etc.) usually.
Like this, when foreign matter detects, driving frequency is changed to F2 from F1, can be by strengthen the distortion of the waveform of coil-end signal CSG (induced voltage signal) near coil resonance frequency F0.
Specifically, as explanation in Fig. 9 described later (C),, become master control as a side of the sine wave of harmonic wave when driving frequency during near resonance frequency.Therefore, use frequency F2 by driving frequency being set at detect near the foreign matter of resonance frequency F0, electricly compare sine wave with the situation of frequency F1 and become master control with being set to send usually, waveform is distortion more.That is, in the frequency band that is easy to generate pulsewidth change (phase place change), can carry out foreign matter and detect.Its result, it is highly sensitive that foreign matter detects, and improves the precision that foreign matter detects.That is, waveform has bigger change in few load change, because XTPW1, XPTW2 change is bigger during the pulsewidth, the little metallic foreign body of size etc. also detect easily.
For example, from the efficient of electric power transfer and the viewpoint of current sinking, the driving frequency F1 when sending electricity usually is set to the frequency of off-resonance frequency F0, does not generally use when sending electricity usually near the frequency F2 of resonance frequency F0.
But, when the foreign matter detection of sending usually before establishing the beginning by cable (one time foreign matter detects, and first foreign matter detects), the transistor T B2 of Fig. 2 is cut off, owing to send electricity to stop to the electric power of load 90, so be subjected to electric side to become almost non-loaded state.Therefore, when foreign matter detects, need not consider power transmission efficiency and power consumption, though with foreign matter detect be set near the frequency of resonance frequency F0 with frequency F2 also no problem.In the present embodiment, from such viewpoint setpoint frequency F0 and the frequency F2 between the F1.
In addition, as described later, the pulsewidth detection method of first mode is compared with second mode, and the deviation that the pulsewidth of power supply voltage variation etc. is detected is few, but has the problem low to the sensitivity of load change.In this point, according to first mode when foreign matter detects, as foreign matter being detected with frequency F2, because the distortion of the waveform of load change is become big, so there is the advantage that can improve for the sensitivity of load change near resonance frequency F0.
In addition, as above-mentioned waveform detection circuit 30 except that the pulsewidth detection method, can adopt the whole bag of tricks of method for detecting phases and crest voltage detection method etc.And, when adopting such method, in its method, foreign matter detected be set at optimum frequency just, for example, foreign matter can be detected with frequency F2 and be set at than sending the electric frequency F1 of using high frequency usually with frequency F2.
4. first variation
First variation of present embodiment shown in Figure 7, in Fig. 7, for example, when the inductance of primary coil L1 different with the capacitor volume value that constitutes resonant circuit, or power supply voltage variation, or during the relation change of the distance of primary coil L1, secondary coil L2 and position, the crest voltage of induced voltage signal PHIN (amplitude) also changes.Therefore, only detect the method for the crest voltage of signal PHIN, have and to realize the correct danger that detects load change.So in Fig. 7, the detection of the pulse width information by carrying out induced voltage signal PHIN1 detects the load change along with foreign matter insertion etc.
In Fig. 7, waveform detection circuit 30 includes first waveform detection circuit 31 of the wave form varies of the first induced voltage signal PHIN1 that detects primary coil L1.And first waveform detection circuit 31 comprises first waveform shaping circuit 32 and first pulse width detection circuit 33.The induced voltage signal PHIN1 of waveform shaping circuit 32 (pulse signal generative circuit) waveform shaping primary coil L1, output waveform reshaping signal WFQ1.Specifically, for example, surpass under the situation of given threshold voltage at signal PHIN1, output is in the waveform shaping signal WFQ1 (pulse signal) of the rectangular wave (square wave) of enabled state (for example, H level).
Pulse width detection circuit 33 detects the pulse width information of the induced voltage signal PHIN1 of primary coil L1.Specifically, accept the drive clock pulsed D RCK (driver control signal) that waveform shaping signal WFQ1 that waveform shaping circuit 32 sends and drive clock pulse generation circuit 25 send, by detecting the pulse width information of waveform shaping signal WFQ1, detect the pulse width information of induced voltage signal PHIN1.
For example, with induced voltage signal PHIN from GND side (low potential power source side) change and the timing that surpasses first threshold voltage VT1 as first regularly.At this moment, first edge that pulse width detection circuit 33 is measured drive clock pulsed D RCK regularly (for example, descend timing) and first between regularly during, promptly during first pulsewidth, detect first pulse width information.For example, the voltage signal PHIN1 that measures induction by the change in voltage of drive clock pulsed D RCK is in during first pulsewidth below the given threshold voltage VT1.And, measure size for the pulsewidth of the waveform shaping signal WFQ1 (induced voltage signal) of the pulsewidth of drive clock pulsed D RCK.At this moment the measurement during first pulsewidth is such as utilizing reference clock pulse CLK to carry out.And the data PWQ1 of the measurement result in pulse width detection circuit 33 is such as being latched in the not shown latch cicuit.Specifically, pulse width detection circuit 33 uses the counter of the increment (or decrement) carry out count value according to reference clock pulse CLK, measures during first pulsewidth, and the data PWQ1 of its measurement result is latched in the latch cicuit.
And control circuit 22 detects the load condition (height of load change, load) that is subjected to electric side (primary side) based on detected pulse width information in pulse width detection circuit 33.Specifically, control circuit 22 carries out foreign matter and detects (one time foreign matter detects) based on detected pulse width information in pulse width detection circuit 33.Perhaps, can detect by the data that load-modulate sends current-collecting device 40.
Measurement result in the signal waveform of drive clock pulsed D RCK shown in Fig. 8 (A)～Fig. 8 (C), coil-end signal CSG, induced voltage signal PHIN1 and pulse signal PLS1.Fig. 8 (A), Fig. 8 (B), Fig. 8 (C) are that each signal is respectively in low load (for example, the load current of primary side=0mA), middle load (load current=70mA) and the high capacity (signal waveform separately (voltage waveform) under the situation of load current=150mA).In addition, the pulse signal PLS1 that in pulsewidth detects, uses induced voltage signal PHIN1 surpass first threshold voltage VT1 first regularly TM1 become signal as the H level, become the signal of L level at drive clock pulsed D RCK rising edge timing TR.In addition, as being used to measure threshold voltage VT1 during the pulsewidth threshold voltage of N transistor npn npn (for example), can preferably set the best voltage of accuracy of detection of load condition.
Shown in Fig. 8 (A)～Fig. 8 (C), XTPW1 is long more during the pulsewidth of (load current is big more) the pulse signal PLS1 that is subjected to the load of electric side high more.Therefore, by measuring XTPW1 during this pulsewidth, can detect the load condition (height of load) that is subjected to electric side.For example, when (between L1 and the L2) inserts the foreign matter of metal etc. on primary coil, foreign matter has been supplied with the electric power of primary side.Be subjected to the load condition of electric side to be in overload.In this case, the length of XTPW1 can detect this overload during the pulsewidth by measuring, and can realize that so-called foreign matter detects (one time foreign matter detects).In addition, by XTPW1 during the measurement pulsewidth, the height of the load of the load-modulate portion 46 of judgement current-collecting device 40, can detect the transmission data that sent by electric side is " 0 " or " 1 ".
In addition, in Fig. 8 (A)～Fig. 8 (C), will begin to the rising edge of drive clock pulsed D RCK during regularly the period stipulation of TR is pulsewidth from timing TM1.That is to say that in this case, XTPW1 was as first pulse width information during first waveform detection circuit 31 detected the pulsewidth of pulse signal PLS1.But, shown in Figure 11 as described later, will from the trailing edge of drive clock pulsed D RCK regularly TF be TPW1 during the pulsewidth to the period stipulation of timing TM1, TPW1 was as first pulse width information during preferred first waveform detection circuit 31 detected pulsewidth.According to like this, when the load that is subjected to electric side is low, can prevent from noise signal is used as situation during pulse signal is measured pulsewidth.And, in this case, be subjected to the load of electric side high more, TPW1 is short more during the pulsewidth.Therefore, TPW1 during pulsewidth (pulsewidth count value) can judge on primary coil L1 and insert foreign matter when shortening than (given count value) during given, realizes that foreign matter detects.
At the equivalent circuit diagram of the primary side when non-loaded shown in Fig. 9 (A), the equivalent circuit diagram when shown in Fig. 9 (B) load being arranged.Shown in Fig. 9 (A), when non-loaded, form the serial resonant circuit by the leakage inductance Ll1 and the coupling inductance M of capacitor C and primary side.Therefore, shown in the B1 of Fig. 9 (C), the coil resonance characteristic when non-loaded is the high characteristic jumpy of Q value.On the other hand, when load is arranged, the resistance R L of the leakage inductance Ll2 of increase primary side and the load of primary side.Therefore, shown in Fig. 9 (C), the resonance frequency fr2 when load is arranged, the fr3 resonance frequency fr1 when non-loaded is big.In addition, by the influence of resistance R L, the resonance characteristic Q value when load is arranged becomes low characteristic slowly.Especially along with becoming high capacity from low load, resonance frequency uprises, and resonance frequency approaches the driving frequency (frequency of DRCK) of coil.
Like this, when resonance frequency approached driving frequency, the part that manifests the sine wave of harmonic wave was inchmeal come.That is, in the voltage waveform when the low load shown in Fig. 8 (A), the sine wave that likens to harmonic wave as the rectangular wave of drive waveforms is in the master control status.Be directed to this, in the voltage waveform when the high capacity shown in Fig. 8 (C), the rectangular wave that likens to drive waveforms as the sine wave of harmonic wave is in the master control status.Its result becomes high capacity more, XTPW1 elongated more (TPW1 shortens more) during the pulsewidth.Therefore, can judge the change (just) of the load that be subjected to electric side with simple formation by XTPW1 (TPW1) during the measurement pulsewidth.
For example, the method for the load change that is subjected to electric side that causes because of the insertion of metallic foreign body etc. is distinguished in the variation of considering the crest voltage of a magnetic test coil end signal.But, when according to this method, load variations not only, even according to distance and the position relation of primary coil L1 and secondary coil L2, crest voltage has also changed.Therefore, the deviation that exists load change to detect becomes big problem.
Being directed to this, in the pulsewidth detection method of present embodiment, is not to measure crest voltage by utilizing digital processing, but measures during the pulsewidth that changes according to the load condition that is subjected to electric side, detects load change.Therefore, the advantage that can realize that the few load change of deviation detects is arranged.
In addition, also consider to judge the method for the load change that is subjected to electric side based on the phase characteristic of load., just be meant the characteristic of voltage, current and phase difference here, in the method, exist circuit to constitute problem complicated, expensiveization according to the phase characteristic of load.
Be directed to this, in the pulsewidth detection method of present embodiment,, can simplify the advantage that circuit constitutes so have owing to can utilize voltage waveform to handle as numerical data with simple waveform shaping circuit and counting circuit (counter).In addition, also have and detect crest voltage and detect the advantage that the combination of the amplitude detecting method of load change realizes easily.
Especially in the pulsewidth detection method of present embodiment, shown in Fig. 8 (A)～Fig. 8 (C), measure by induced voltage signal PHIN1 and begin to change and surpass XTPW1 during the pulsewidth of timing TM1 regulation of threshold voltage VT1 from 0V (GND side).Therefore, by threshold voltage VT1 is set at 0V near, can reduce the harmful effect that the change because of the distance of power supply voltage variation or coil and position relation causes, can realize that especially the few load change of deviation detects.
The power transmission control device 20 of first variation shown in Figure 10 and the concrete configuration example of waveform monitoring circuit 14.Waveform monitoring circuit 14 comprises first rectification circuit 17 that has the amplitude limit function.This rectification circuit 17 comprises the coil-end node NA2 that is arranged on the coil-end signal CSG that generates primary coil L1 and generates electric current limiting resistance RA1 between the first monitor node NA11 of induced voltage signal PHIN1 that waveform monitors usefulness.And rectification circuit 17 carries out halfwave rectifier to induced voltage signal PHIN1 in the amplitude limit action of the voltage (high potential power voltage) that carries out induced voltage signal PHIN1 clamper is become VDD.
By such electric current limiting resistance RA1 is set, prevent to flow into the situation of the IC terminal of power transmission control device 20 from the excessive electric current of coil-end node NA2.In addition, rectification circuit 17 prevents to apply the voltage condition more than the maximum rated voltage by induced voltage signal PHIN1 clamper being become the voltage of VDD on the IC of power transmission control device 20 terminal.In addition, rectification circuit 17 prevents to apply negative voltage condition on the IC of power transmission control device 20 terminal by carrying out halfwave rectifier.
Specifically, rectification circuit 17 comprise be arranged between monitor node NA11 and VDD (sensu lato high potential power) node, with from monitor node NA1 towards the direction of VDD node the first diode DA1 as forward.Also comprise be arranged between monitor node NA11 and GND (sensu lato low potential power source) node, with from the GND node towards the direction of monitor node NA11 the second diode DA2 as forward.Realize moving by diode DA1, realize halfwave rectifier by diode DA2 to the amplitude limit of VDD.
In addition, voltage stabilizing didoe can be set to replace being provided with diode DA1.That is, can be arranged between monitor node NA11 and GND (low potential power source) node with from the GND node towards the direction of monitor node NA11 voltage stabilizing didoe as forward.
Waveform shaping circuit 32 (first waveform shaping circuit) is included in the resistance R C1 that is connected in series between VDD (high potential power) and the GND (low potential power source) and the transistor T C1 and the phase inverter INVC1 of N type.Input to the grid of transistor T C1 from the induced voltage signal PHIN1 of waveform monitoring circuit 14.And when signal PHIN1 was higher than the threshold voltage of transistor T C1, TC1 became conducting, because the voltage of node NC1 becomes the L level, so waveform shaping signal WFQ1 becomes the H level.On the other hand, when signal PHIN1 was lower than threshold voltage, waveform shaping signal WFQ1 became the L level.
Pulse width detection circuit 33 includes first counter 122.This first counter 122 carries out the increment (or decrement) of count value during pulsewidth, measure the length of (during first pulsewidth) during the pulsewidth based on the count value that obtains.In this case, counter 122 is handled such as the counting that carries out count value based on reference clock pulse CLK.
More particularly, pulse width detection circuit 33 includes the first permission signal generating circuit 120.This allows signal generating circuit 120 to accept the first waveform shaping signal WFQ1 and drive clock pulsed D RCK, generates the first permission signal ENQ1 that is in enabled state during first pulsewidth.And counter 122 carries out the increment (or decrement) of count value when allowing signal ENQ1 to enable (for example, H level).
This permission signal generating circuit 120 can be included in its clock pulse terminal (counter-rotating clock pulse terminal) and go up input drive clock pulsed D RCK (comprising the signal with the DRCK equivalence), imports the voltage of VDD (high potential power) on its data terminal, go up the circuits for triggering FFC1 that imports waveform reshaping signal WFQ1 (comprising the signal with the WFQ1 equivalence) at its reseting terminal (non-counter-rotating reseting terminal).According to these circuits for triggering FFC1, after waveform shaping signal WFQ1 becomes the L level, when drive clock pulsed D RCK is the L level, its output signal, promptly allow signal ENQ1 to become H level (enabling).Afterwards, when waveform shaping signal WFQ1 was the H level, circuits for triggering FFC1 was reset, and became L level (disable) as the permission signal ENQ1 of its output signal.Therefore, counter 122 by allow with reference clock pulse CLK counting signal ENQ1 become H level (enabling) during, can measure during the pulsewidth.
In addition, allowing signal generating circuit 120 can be included in the last input of its clock pulse terminal (counter-rotating clock terminal) has drive clock pulsed D RCK, is being connected with GND (low potential power source) on its data terminal, imports the circuits for triggering that waveform shaping signal WFQ1 is arranged on its set terminal.In this case, can be with the reverse signal of the output signal of circuits for triggering as allowing signal ENQ1 to be input in the counter 122.
The count value CNT1 (pulse width information) that count value holding circuit 124 keeps from counter 122.And the data LTQ1 of the count value of maintenance is to output circuit 126 outputs.
Output circuit 126 (filter circuit, noise canceller circuit) is received in the data LTQ1 of the count value that keeps in the count value holding circuit 124, dateout PWQ1 (first pulse width information).This output circuit 126 compares and exports the comparison circuit 130 of count value greatly such as comprising to the count value of this maintenance in count value holding circuit 124 and the count value that kept in last time.Based on this, keep peaked count value from output circuit 126 outputs.According to said method, can suppress, realize that stable pulsewidth detects because of the variation during the pulsewidth of noise etc.In addition, also can facilitation with the combination of amplitude detecting method.
The signal waveform example of the action of the circuit that is used to illustrate Figure 10 shown in Figure 11.In the timing of the D1 of Figure 11, when waveform shaping signal WFQ1 becomes the L level, remove resetting of circuits for triggering FFC1.And at drive clock pulsed D RCK trailing edge timing TF, the voltage of the VDD circuits for triggering FFC1 that gets being shot based on this, allows signal ENQ1 to be changed to the H level from the L level.Its result, counter 122 begins counting to be handled, and uses reference clock pulse CLK to measure TPW1 during the pulsewidth.
Then, at the first timing TM1, when waveform shaping signal WFQ1 became the H level, reset trigger circuit FFC1 allowed signal ENQ1 to change to the L level from the H level.Based on this, the counting of counter 122 is finished dealing with.And, handle the measurement result that the count value that obtains becomes TPW1 during the expression pulsewidth by this counting.
In addition, as shown in figure 11, TPW1 and XTPW1 addition became during the half period of drive clock pulsed D RCK during the pulsewidth.And, be subjected to the pulsewidth of high more Fig. 8 of load (A)～Fig. 8 (C) of electric side during XTPW1 long more.Therefore, be subjected to the pulsewidth of the high more Figure 11 of load of electric side during TPW1 short more.During the pulsewidth of Fig. 8 (A)～Fig. 8 (C) among the XTPW1, when the load that is subjected to electric side is low, the problem that exists noise signal and pulse signal to be difficult to distinguish, but during the pulsewidth of Figure 11, among the TPW1, can prevent such problem.
In first mode of the pulsewidth detection method of present embodiment, shown in the D3 of Figure 11, begin to change and surpass the timing TM1 of the threshold voltage VTL of low potential side from 0V based on coil-end signal CSG, be defined as TPW1 during the pulsewidth.That is, during the pulsewidth TPW1 be drive clock pulsed D RCK trailing edge regularly TF and regularly between the TM1 during, change by cause timing TM1 because of the load change that is subjected to electric side, TPW1 changes during the pulsewidth.And because the threshold voltage VTL of regulation timing TM1 is a low-voltage, when changes such as supply voltage, regularly the deviation of TM1 is few.In addition, when the distance of coil L1 and L2 and position relation change, regularly the deviation of TM1 is few.Therefore, according to first mode of present embodiment, can realize the little pulsewidth detection mode of harmful effect of the change of supply voltage etc.
In addition, in the rectification circuit 17 of Figure 10, different with the rectification circuit 18 that second mode of present embodiment shown in Figure 16 described later is used, not coil-end signal CSG to be carried out voltage cut apart, but be input in the waveform shaping circuit 32 as induced voltage signal PHIN1.Therefore, the threshold voltage VTL of Figure 11 is roughly with the threshold voltage of the N transistor npn npn TC1 of the waveform shaping circuit 32 of Figure 10 and equates, is roughly and equates with Fig. 8 (A)～threshold voltage VT1 of Fig. 8 (C).
In addition, the formation of waveform shaping circuit 32 is not limited to the formation of Figure 10, such as comprising comparator etc.In addition, the formation of permission signal generating circuit 120 also is not limited to the formation of Figure 10, such as being made of the logical circuit of NOR circuit and NAND circuit etc.In addition, the formation of output circuit 126 also is not limited to the formation of Figure 10, such as the averaging circuit that can comprise the mean value (rolling average) of trying to achieve several count values (for example, the count value of this count value and last time).
5. second variation
Second variation of present embodiment shown in Figure 12.In this second variation, waveform detection circuit 30 also includes second waveform detection circuit 34 of the wave form varies of the second induced voltage signal PHIN2 that detects primary coil L1 except that first waveform detection circuit 31 with Fig. 7, Figure 10 explanation.Here, the pulsewidth of first mode of explanation such as first waveform detection circuit, 31 usefulness Fig. 8 (A)～Fig. 8 (C) detects.On the other hand, the pulsewidth of second waveform detection circuit, 34 usefulness Figure 13 (A)～second mode that Figure 13 (C) illustrates detects.
Second waveform detection circuit 34 includes second waveform shaping circuit 35 and second pulse width detection circuit 36.The induced voltage signal PHIN2 of waveform shaping circuit 35 waveform shaping primary coil L1, output waveform reshaping signal WFQ2.Specifically, for example, surpass under the situation of given threshold voltage the waveform shaping signal WFQ2 of the rectangular wave (square wave) of output enable (for example, H level) at signal PHIN2.
Pulse width detection circuit 36 detects the pulse width information of the induced voltage signal PHIN2 of primary coil L1.Specifically, acceptance is from the waveform shaping signal WFQ2 of waveform shaping circuit 35 with from the drive clock pulsed D RCK of drive clock pulse generation circuit 25, by detecting the pulse width information of waveform shaping signal WFQ2, detect the pulse width information of induced voltage signal PHIN2.
For example, with induced voltage signal PHIN2 from individual high potential power (VDD) side begin to change and the timing that is lower than the second threshold voltage VT2 as second regularly.In this case, second edge that pulse width detection circuit 36 is measured drive clock pulsed D RCK regularly (for example, rising edge regularly) and second between regularly during, promptly during second pulsewidth, thereby detect second pulse width information.For example, measuring the voltage signal PHIN2 that responds to according to the change in voltage of drive clock pulsed D RCK becomes during second pulsewidth more than the given threshold voltage VT2.And, measure size for the pulsewidth of the waveform shaping signal WFQ2 (induced voltage signal) of the pulsewidth of drive clock pulsed D RCK.Measurement during the pulsewidth in this case is such as carrying out with reference clock pulse CLK.And the data PWQ2 of the measurement result in pulse width detection circuit 36 is such as being latched in the not shown latch cicuit.Specifically, pulse width detection circuit 36 utilizes the reference clock pulse to use the counter of the increment (or decrement) that carries out count value, measures during the pulsewidth, and the data PWQ2 of its measurement result is latched in the latch cicuit.
And control circuit 22 carries out foreign matter and detects (the secondary foreign matter detects, and foreign matter detects for the second time) based on detected pulse width information in pulse width detection circuit 36.Perhaps, carry out detecting the data that send by current-collecting device 40 load variations.
Measurement result in the signal waveform of drive clock pulsed D RCK shown in Figure 13 (A)～Figure 13 (C), coil-end signal CSG, induced voltage signal PHIN2 and pulse signal PLS2.Figure 13 (A), Figure 13 (B) and Figure 13 (C) are each signal signal waveforms separately under the situation of low load, middle load and high capacity respectively.In addition, the pulse signal PLS2 that uses in pulsewidth detects becomes the H level, becomes the L level at the trailing edge timing TF of drive clock pulsed D RCK at the second timing TM2 that induced voltage signal PHIN2 is lower than the second threshold voltage VT2.In addition, as being used to measure threshold voltage VT2 during the pulsewidth threshold voltage of N transistor npn npn (for example), the voltage of the accuracy of detection of suitable load condition can suit to select to set.
Shown in Figure 13 (A)～Figure 13 (C), be subjected to the load of electric side high more, XTPW2 is long more during the pulsewidth of pulse signal PLS2.Therefore, can detect the load condition that is subjected to electric side by XTPW2 during measuring this pulsewidth.Specifically, detect foreign matter (detection of secondary foreign matter), can detect from being subjected to the transmission data (preservation frame) of electric side is " 0 " or " 1 ".
In addition, in Figure 13 (A)～Figure 13 (C), trailing edge that will be from timing TM2 to the drive clock pulsed D RCK regularly period stipulation of TF is XTPW2 during the pulsewidth.That is, in this case, XTPW2 was as second pulse width information during second waveform detection circuit 34 detected the pulsewidth of pulse signal PLS2.But, shown in Figure 17 as described later, will from the rising edge of DRCK regularly TR be TPW2 during the pulsewidth to the period stipulation of timing TM2, TPW2 was as second pulse width information during preferred second waveform detection circuit 34 detected pulsewidth.According to above-mentioned formation, when the load that is subjected to electric side is low, can prevent the situation during noise signal is taken as pulse signal and has measured pulsewidth.And, in this case, uprised more by the load of electric side, TPW2 shortens more during the pulsewidth.
Second mode (decline detection mode) of Figure 13 (A)～Figure 13 (C) is compared with first mode (rise detection mode) of Fig. 8 (A)～Fig. 8 (C), even few load change, has highly sensitive advantage at the variation that pulsewidth (count value) is also bigger.On the other hand, first mode of Fig. 8 (A)～Fig. 8 (C) is compared with second mode of Figure 13 (A)～Figure 13 (C), for the change of the distance of power supply voltage variation or coil L1 and L2 and position relation, has the few advantage of detection deviation of pulsewidth.
For example, Figure 14 (A) is the figure of expression for the detection deviation of the pulsewidth of the power supply voltage variation in first mode.Figure 14 (B) is the figure of expression for the detection deviation of the pulsewidth of the power supply voltage variation in second mode.
Shown in Figure 14 (A), in first mode, even supply voltage uprises or step-down, the characteristic curve of load current-pulsewidth is not too change also.On the other hand, shown in Figure 14 (B), in second mode, when supply voltage uprises or during step-down, then the characteristic curve of load current-pulsewidth also changes, big for the detection deviation of the pulsewidth of power supply voltage variation.
Therefore, in second variation of Figure 12, send foreign matter before establishing the beginning by cable to detect usually, promptly a foreign matter detects in (first foreign matter detection), first waveform detection circuit 31 is carried out waveforms detection in first mode, use is by its first pulse width information (PWQ1) that obtains.On the other hand, sending the foreign matter after establishing the beginning by cable to detect, be that the secondary foreign matter detects in (foreign matter detects for the second time) that second waveform detection circuit 34 is carried out waveforms detection in second mode, uses by its second pulse width information (PWQ2) that obtains usually.In addition, such as detecting with second pulse width information from the data (notice is full of the data of electro-detection etc.) that sent by electric side.
The flow chart that a foreign matter detects and the detection of secondary foreign matter describes that is used for these shown in Figure 15.
At first, start primary side (power transmission device side) (step S21), the primary side that has started send electricity (step S22) to the electric power (electric power that position probing is used) that is used to start primary side, carries out the transition to communication holding state (step S23).So primary side (current-collecting device side) starts (step S31), send authentication frame (ID synchronously) (step S32) to primary side by the load-modulate that in Fig. 3 (B), illustrates.
Primary side (primary coil side) then carries out ID authentication (step S24) when receiving authentication frame.And, with driving frequency (frequency of DRCK) be set at send usually electricity with the different frequency of frequency F1, be foreign matter detection frequency F2.Specifically, be set at send usually electricity with the frequency between frequency F1 and the coil resonance frequency F0, be foreign matter detection frequency F2.
And primary side is in driving frequency is set at such foreign matter detection with carrying out a foreign matter detection (step S26) under the state of frequency F2.Specifically, according to first mode of explanation among Fig. 8 (A)～Fig. 8 (C), first waveform detection circuit 31 is carried out a foreign matter by waveforms detection and is detected.
Then, primary side is set at driving frequency and send electricity frequency F1 usually, and electricity (step S27) is sent in beginning usually, and based on this, primary side receives electric power (step S33).
Begin such sending usually after the electricity, carry out the secondary foreign matter and detect (step S28).Specifically, according to second mode of explanation in Figure 13 (A)～Figure 13 (C), second waveform detection circuit 34 is carried out the detection of secondary foreign matter by carrying out waveforms detection.At this moment, preferred secondary foreign matter detects after electricity is sent in beginning usually and carries out termly.
And, primary side when detect load be full of electricity the time send electricity to finish usually notice (step S34), based on this, primary side is finished and is sent electricity (step S29) usually.
In Figure 15, send usually before establishing the beginning by cable such as no-load condition the time, carry out the detection of foreign matter.And shown in Figure 14 (A), this foreign matter detects to carry out for the first few mode of deviations such as power supply voltage variation.Therefore, even the situation of power supply voltage variation etc. is arranged, when also can detect at foreign matter that can be stable, the count value of the pulsewidth that will obtain in this foreign matter detects is set as fiducial value.And, based on the fiducial value under this no-load condition, send the secondary foreign matter behind the electricity to detect usually, can detect from what be subjected to data that electric side sends is " 0 " or 1 ", the load change detection of implementation efficiency.
The concrete configuration example of second variation of present embodiment shown in Figure 16.In Figure 16, the waveform shaping circuit 35 of second waveform detection circuit 34 constitutes identical with the waveform shaping circuit of first waveform detection circuit 31 32.In addition, in the permission signal generating circuit 140 of second waveform detection circuit 34, drive clock pulsed D RCK is arranged in input on the clock pulse terminal of the non-counter-rotating of its circuits for triggering FFC2, input has waveform shaping signal WFQ2 on the reseting terminal of counter-rotating.The formation of the counter 142 of second waveform detection circuit 34 in addition, count value holding circuit 144 and output circuit 146 is identical with the formation of the counter 122 of first waveform detection circuit 31, count value holding circuit 124 and output circuit 126.
In addition, in Figure 16, waveform monitoring circuit 14 also includes second rectification circuit 18 except that including first rectification circuit 17.This second rectification circuit 18 monitors the second induced voltage signal PHIN2 of usefulness to second waveform detection circuit, 34 output waveforms by the second monitor node NA21.Specifically, rectification circuit 18 include be arranged on the first resistance R A2 between coil-end node NA2 and the monitor node NA21 and be arranged on monitor node NA21 and GND (low potential power source) node between the second resistance R A3.In addition, also include the 3rd diode DA3 that is arranged between monitor node NA21 and the GND node.And the voltage by resistance R A2, RA3 potential coil end signal CSG inputs to second waveform detection circuit 34 as induced voltage signal PHIN2.In addition, the halfwave rectifier by diode DA3 carries out coil-end signal CSG just can not be applied to negative voltage on second waveform detection circuit 34.
The signal waveform example of the action of the circuit that is used to illustrate Figure 16 shown in Figure 17.In the timing of the D2 of Figure 17, when waveform shaping signal WFQ2 is the H level, remove resetting of circuits for triggering FFC2.And the voltage of VDD enters into circuits for triggering FFC2 in the rising edge timing TR of drive clock pulsed D RCK, based on this, allows signal ENQ2 to change to the H level from the L level.Its result, counter 142 begins counting to be handled, and measures TPW2 during the pulsewidth with reference clock pulse CLK.
Then, at the second timing TM2, when waveform shaping signal WFQ2 became the L level, reset trigger circuit FFC2 allowed signal ENQ2 to change to the L level from the H level.Based on this, the counting of counter 142 is finished dealing with.And, handle the measurement result that the count value that obtains becomes TPW2 during the expression pulsewidth by this counting.
In addition, as shown in figure 17, TPW2 and XTPW2 addition became during the half period of drive clock pulsed D RCK during the pulsewidth.And, be subjected to the load of electric side high more, XTPW2 is long more during the pulsewidth of Figure 13 (A)～Figure 13 (C).Therefore, be subjected to the load of electric side high more, short more about TPW2 during the pulsewidth of Figure 17.During the pulsewidth of Figure 13 (A)～Figure 13 (C), among the XTPW2, when the load that is subjected to electric side is low, exists and be difficult to the problem of distinguishing noise signal and pulse signal, but during the pulsewidth of Figure 17, can prevent such problem among the TPW2.
Shown in the D3 of Figure 17, in first mode, with the threshold voltage VTL judgement timing TM1 of low potential side, shown in D4, the threshold voltage VTH with hot side in second mode judges regularly TM2.
And, shown in the D3 of Figure 17, judge regularly in first mode of TM1 at threshold voltage VTL with low potential side, when the rectification circuit 18 that uses second mode shown in Figure 16 to use, by the dividing potential drop of resistance R A2, RA3, damaged waveform by pressure, the danger of accuracy of detection deterioration is arranged.
This point in the rectification circuit 17 that first mode shown in Figure 16 is used, needn't be used the dividing potential drop of resistance, just the signal PHIN1 that obtains by clamper and halfwave rectifier coil-end signal CSG can be inputed to first waveform monitoring circuit 31.Therefore, the signal PHIN1 based on the complete waveform of the dividing potential drop of not using resistance just can detect pulsewidth, so can improve accuracy of detection.In addition, by diode DA1, DA2 are set, can prevent that stop signal PHIN1 surpasses maximum rated voltage, negative voltage is input to the situation of first waveform detection circuit 31.
On the other hand, in the rectification circuit 18 that second mode is used, input to the N transistor npn npn TC2 of waveform shaping circuit 35 by the signal PHIN2 of resistance R A2, RA3 dividing potential drop.And, by carrying out such dividing potential drop, when anti-stop signal PHIN2 has surpassed maximum rated voltage condition, shown in the D4 of Figure 17, threshold voltage VTH can be set at hot side.That is, signal PHIN1, PHIN2 are input to the N transistor npn npn TC1 of same threshold voltage, the grid of TC2 respectively.But, because signal PHIN2 is a signal by resistance R A2, RA3 dividing potential drop, so when observing in coil end signal CSG, the threshold voltage VTL shown in threshold voltage VTH shown in the D4 and the D3 is in a ratio of high voltage.And, bigger for the variation of the pulse duration of load change when setting such threshold voltage VTH and be high voltage, can realize that the good load change of sensitivity detects.Therefore, can realize sending usually the secondary foreign matter of establishing by cable after the beginning to detect rightly and the data " 1 " that send from primary side, the judgement of " 0 ".
6. the 3rd variation
The 3rd variation of present embodiment shown in Figure 18.In the 3rd variation, waveform detection circuit 30 comprises: amplitude detecting circuit 200, A/D change-over circuit 208 and latch cicuit 230.And, detect the load change that is subjected to electric side by the amplitude information (crest voltage, amplitude voltage and alternating voltage) that detects induced voltage signal PHIN3.And, when the foreign matter according to this amplitude detecting detects, driving frequency can be set at foreign matter detection frequency F2.In addition, first, second waveform detection circuit 31,34 of Figure 12 can be set, add the formation of the 3rd waveform detection circuit of the amplitude detecting circuit 200, A/D change-over circuit 208 and the latch cicuit 230 that include Figure 18.
Amplitude detecting circuit 200 includes the N transistor npn npn TA1 of operational amplifier OPA1, OPA2 and the maintenance capacitor C A1 and the usefulness that resets.Operational amplifier OPA1 has signal PHIN3 in input on its non-counter-rotating input terminal, is connected with the output node NA5 of operational amplifier OPA2 on its counter-rotating input terminal.Keep capacitor C A1 and reset with transistor T A1 be arranged on operational amplifier OPA1 output node, be between the maintenance node NA4 and GND of crest voltage.Operational amplifier OPA2 is connected with on its non-counter-rotating input terminal and keeps node NA4, is connected with the output node NA5 of OPA2 on its counter-rotating input terminal, constitutes the operational amplifier that voltage follower connects.In addition, at the back segment of operational amplifier OPA2, the operational amplifier that voltage follower connects can be set again.
Constitute peak holding circuit (peak detection circuit) by operational amplifier OPA1, OPA2, the maintenance capacitor C A1 of Figure 18, the usefulness that resets transistor T A1.That is, the crest voltage of the signal PHIN2 that waveform monitoring circuit 14 sends is maintained at and keeps on the node NA4, and the signal of the crest voltage of this maintenance is exported to node NA5 by the operational amplifier OPA2 impedance transformation that voltage follower connects.In addition, resetting is in conducting state with transistor T A1 at reseting period, will keep the electric charge of node NA4 to be sidelong to GND.
A/D change-over circuit 208 includes sampling hold circuit 210, comparator C PA1, comparand register 212 and D/A change-over circuit 214 one by one.Sampling hold circuit 210 sampled signal PHQ keep.Comparator C PA1 is to comparing from the analog signal DAQ after the D/A of D/A change-over circuit 214 conversion with from the sampling inhibit signal SHQ of sampling hold circuit 210.Comparand register 212 (comparison control circuit one by one) is stored the data of the output signal CQ1 of comparator C PA1 one by one.214 pairs of D/A change-over circuits carry out the D/A conversion from the numerical data SAQ such as 8 of comparand register 212 one by one, and output analog signal DAQ.
At this one by one relatively in the A/D change-over circuit 208 of type, comparator C PA1 compares signal DAQ and the input signal SHQ (PHQ) after only the D/A during as " 1 " changes with MSB (highest order).And, if a senior general side MSB of the voltage of signal SHQ still is defined as " 1 " if young pathbreaker MSB is defined as " 0 ".And, even A/D change-over circuit 208 carries out comparison process one by one too to later low level.And, will finally obtain ground numerical data ADQ and export to latch cicuit 230.In addition, A/D change-over circuit 208 is not limited to the formation of Figure 18, such as being comparison A one by one/D change-over circuit that different circuit constitutes, also can be to follow the tracks of relatively type, the A/D change-over circuit of type, dual-integration type etc. relatively side by side.
In addition, above-mentioned present embodiment is explained, but as long as not breaking away from inventive point of the present invention and effect in fact can carry out various distortion, this will be readily apparent to persons skilled in the art.Therefore, such variation also all is included within protection scope of the present invention.For example, in specification or accompanying drawing, have once the word of putting down in writing simultaneously with different terms of broad sense or synonym (low potential power source, high potential power, electronic equipment etc.) more (CND, VDD, mobile phone, charger etc.) at least, can replace with different terms Anywhere at specification or accompanying drawing.In addition, whole combinations of present embodiment and variation are included within protection scope of the present invention.In addition, these embodiment that power transmission control device, power transmission device, the formation/action that is subjected to controller for electric consumption, current-collecting device and object detecting method and pulsewidth detection method also are not limited to illustrate in the present embodiment can be various variation.
Description of reference numerals
L1 primary coil L2 secondary coil
10 power transmission devices 12 send electric section
14 waveform monitoring circuits, 16 display parts
17 rectification circuits, 18 rectification circuits
20 power transmission control devices, 22 control circuits (power transmission side)
24 oscillating circuits 25 drive clock pulse generating circuit
26 driver control circuits, 30 waveform detection circuit
31 first waveform detection circuit, 32 waveform shaping circuits
33 pulse width detection circuits, 34 second waveform detection circuit
35 waveform shaping circuits, 36 pulse width detection circuits
40 current-collecting devices, 42 power receiving sections
43 rectification circuits, 46 load modulation sections
48 power supply control sections 50 are subjected to controller for electric consumption
52 control circuits (power side), 56 position detecting circuits
58 oscillating circuits, 60 frequency detection circuits
62 are full of power detection circuit 90 loads
92 battery charge controllers, 94 batteries
120 allow signal generating circuit 122 counters
124 count value holding circuits, 126 output circuits
130 comparison circuits 140 allow signal generating circuit
142 counters, 144 count value holding circuits
146 output circuits, 150 comparison circuits
200 amplitude detecting circuit 208A/D change-over circuits
210 sampling hold circuits 212 are comparand register one by one
The 214D/A change-over circuit

Claims (16)

1. power transmission control device, be arranged on by making primary coil and secondary coil electromagnetic coupled from power transmission device on current-collecting device transferring electric power and described power transmission device the non-contact power transmitting system of the load supply capability of described current-collecting device, it is characterized in that, comprising:
Drive clock pulse generation circuit, the drive clock pulse that is used to generate the driving frequency of the described primary coil of the regulation line output of going forward side by side;
Driver control circuit generates the driver control signal based on described drive clock pulse, and exports to the electric drive that send that drives described primary coil;
Waveform detection circuit is used to detect the wave form varies of the induced voltage signal of described primary coil; And
Control circuit based on the testing result in described waveform detection circuit, carries out foreign matter and detects,
Wherein, described drive clock pulse generation circuit is exported described drive clock pulse carrying out foreign matter when detecting, described drive clock pulse be set to send usually electricity with the different frequency of frequency, be foreign matter detection frequency.
2. power transmission control device according to claim 1 is characterized in that,
Described drive clock pulse generation circuit is exported described drive clock pulse carrying out foreign matter when detecting, described drive clock pulse be set to described send usually electricity with the frequency between frequency and the coil resonance frequency, be foreign matter detection frequency.
3. power transmission control device according to claim 1 and 2 is characterized in that,
Described waveform detection circuit comprises the pulse width detection circuit of the pulse width information that is used to detect induced voltage signal,
Described control circuit carries out foreign matter based on described pulse width information and detects.
4. power transmission control device according to claim 1 and 2 is characterized in that,
Described waveform detection circuit comprises first pulse width detection circuit, described first pulse width detection circuit first induced voltage signal with described primary coil begin from the low potential power source side to change and the timing that exceeds first threshold voltage as first regularly the situation under, first edge of measuring described drive clock pulse regularly and described first between regularly during, promptly during first pulsewidth, and detecting first pulse width information, described control circuit carries out foreign matter based on described first pulse width information and detects.
5. power transmission control device according to claim 4 is characterized in that,
Described waveform detection circuit comprises first waveform shaping circuit, and described first waveform shaping circuit carries out waveform shaping to described first induced voltage signal, and exports the first waveform shaping signal,
Described first pulse width detection circuit based on described first waveform shaping signal and described first pulsewidth of described drive clock impulsive measurement during.
6. power transmission control device according to claim 5 is characterized in that,
Described first pulse width detection circuit comprises first counter, and described first counter carries out the increment or the decrement of count value during described first pulsewidth, and based on resulting count value, measures the length during described first pulsewidth.
7. power transmission control device according to claim 6 is characterized in that,
Described first pulse width detection circuit comprises first and allows signal generating circuit, described first allows signal generating circuit to accept described first waveform shaping signal and described drive clock pulse, during described first pulsewidth, generate the first permission signal that is in enabled state
Described first counter carries out the increment or the decrement of count value when described first allows signal to be in enabled state.
8. power transmission control device according to claim 7 is characterized in that,
Described first allows signal generating circuit to comprise first circuits for triggering, described first circuits for triggering are imported on its clock pulse terminal described drive clock pulse, input has high potential power voltage or low potential power source voltage on its digital terminal, and input has the described first waveform shaping signal on its reseting terminal or set terminal.
9. according to each described power transmission control device in the claim 4 to 8, it is characterized in that,
Described control circuit send usually based on described first pulse width information and establishes preceding foreign matter detection of beginning, i.e. a foreign matter detection by cable.
10. power transmission control device according to claim 9 is characterized in that,
Described waveform detection circuit comprises second pulse width detection circuit, described second pulse width detection circuit second induced voltage signal with described primary coil begin from the high potential power side to change and the timing that is lower than second threshold voltage as second regularly the situation under, second edge of measuring described drive clock pulse regularly and described second between regularly during, promptly during second pulsewidth, and detect second pulse width information
Described control circuit send the foreign matter of establishing by cable after the beginning to detect usually, is that the secondary foreign matter detects based on described second pulse width information.
11. power transmission control device according to claim 10 is characterized in that,
Described waveform detection circuit comprises second waveform shaping circuit, and described second waveform shaping circuit carries out waveform shaping to described second induced voltage signal, and exports the second waveform shaping signal,
Described second pulse width detection circuit based on described second waveform shaping signal and described second pulsewidth of described drive clock impulsive measurement during.
12. power transmission control device according to claim 11 is characterized in that,
Described second pulse width detection circuit comprises second counter, and described second counter carries out the increment or the decrement of count value in during described second pulsewidth, and measures length during described second pulsewidth based on resulting count value.
13. according to claim 11 or 12 described power transmission control devices, it is characterized in that,
Described waveform detection circuit comprises first waveform shaping circuit, and described first waveform shaping circuit carries out waveform shaping to described first induced voltage signal, and the first waveform shaping signal is exported to described first pulse width detection circuit,
Described second waveform shaping circuit pair described second induced voltage signal different with described first induced voltage signal carries out waveform shaping, and the described second waveform shaping signal is exported to described second pulse width detection circuit.
14. a power transmission device is characterized in that comprising:
According to each described power transmission control device in the claim 1 to 13; And
Generating alternating voltage supplies with to the electric portion of sending of described primary coil.
15. an electronic equipment is characterized in that, comprises power transmission device according to claim 14.
16. non-contact power transmitting system, comprise power transmission device and current-collecting device, carry out electric power transfer from described power transmission device to described current-collecting device by making primary coil and secondary coil electromagnetic coupled, and to the load supply capability of described current-collecting device, it is characterized in that
Described current-collecting device comprises the power receiving section that the induced voltage of described secondary coil is converted to direct voltage,
Described power transmission device comprises:
The drive clock pulse generation circuit is used to generate the drive clock pulse of the driving frequency of stipulating described primary coil, the line output of going forward side by side;
Driver control circuit generates the driver control signal based on described drive clock pulse, and exports to the electric drive that send that drives described primary coil;
Waveform detection circuit is used to detect the wave form varies of the induced voltage signal of described primary coil; And
Control circuit based on the testing result in described waveform detection circuit, carries out foreign matter and detects,
Wherein, described drive clock pulse generation circuit is exported described drive clock pulse carrying out foreign matter when detecting, described drive clock pulse be set to send usually electricity with the different frequency of frequency, be foreign matter detection frequency.
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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102122848A (en) * 2010-01-08 2011-07-13 索尼公司 Power feed device, power receiving device, and wireless power feed system
CN102782983A (en) * 2010-04-19 2012-11-14 松下电器产业株式会社 Non-contact power transmission device
CN102904475A (en) * 2011-09-20 2013-01-30 富达通科技股份有限公司 Inductive power supply and detection method of metallic foreign body thereof
CN103098344A (en) * 2011-05-27 2013-05-08 日产自动车株式会社 Contactless electricity supply device
CN103378638A (en) * 2012-04-25 2013-10-30 三洋电机株式会社 Contactless method of supplying power
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CN103997131A (en) * 2013-02-20 2014-08-20 Spacon株式会社 Apparatus and method for detecting foreign object in wireless power transmitting system
CN104471834A (en) * 2012-07-09 2015-03-25 三星电子株式会社 Method and apparatus for providing wireless charging power to a wireless power receiver
CN104953720A (en) * 2014-03-28 2015-09-30 电装波动株式会社 Wireless power supply apparatus for linear motion type robot
CN105005082A (en) * 2014-04-24 2015-10-28 松下电器产业株式会社 Foreign-object detecting device, wireless electric-power transmitting device, and wireless electric-power transmission system
WO2015188552A1 (en) * 2014-06-09 2015-12-17 中兴通讯股份有限公司 Foreign substance detection method and device and wireless charging control method and device
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US9154189B2 (en) * 2012-08-17 2015-10-06 Qualcomm Incorporated Wireless power system with capacitive proximity sensing
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DE112013007727T5 (en) * 2013-12-26 2016-12-22 Mitsubishi Electric Engineering Company, Limited Resonance type power transmission system and resonance type power transmission device
US9369183B2 (en) * 2014-05-15 2016-06-14 Qualcomm Incorporated Systems and methods for measuring power and impedance in wireless power charging systems
JP6471965B2 (en) 2014-05-27 2019-02-20 パナソニックＩｐマネジメント株式会社 Power transmission device and wireless power transmission system
WO2016006441A1 (en) 2014-07-09 2016-01-14 ソニー株式会社 Power receiver, power feeder, and electronic device
CN106160268B (en) 2015-05-15 2020-11-06 松下知识产权经营株式会社 Foreign matter detection device, wireless power transmission device, and wireless power transmission system
EP3093957B1 (en) 2015-05-15 2022-05-18 Panasonic Intellectual Property Management Co., Ltd. Foreign object detecting device, wireless power transmitting apparatus, and wireless power transfer system
JP6650219B2 (en) * 2015-06-25 2020-02-19 ローム株式会社 Power transmission device and contactless power supply system
JP2017073951A (en) * 2015-10-09 2017-04-13 キヤノン株式会社 Electronic apparatus and program
CN110571949A (en) * 2018-11-13 2019-12-13 厦门新页微电子技术有限公司 Built-in crystal oscillator accurate frequency-fixing system applied to wireless charging
JP2021175355A (en) * 2020-04-30 2021-11-01 キヤノン株式会社 Power reception device, control method, and program

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH05300662A (en) * 1992-04-23 1993-11-12 Matsushita Electric Works Ltd Charger
JPH09103037A (en) * 1995-10-05 1997-04-15 Nippon Ido Tsushin Kk Power supply unit, unit to be supplied with power and power supply system
JP3378166B2 (en) * 1997-03-18 2003-02-17 三菱電機株式会社 Pulse signal classification device
JP3247328B2 (en) * 1997-12-09 2002-01-15 浩 坂本 Non-contact power transmission device
JPH11341711A (en) * 1998-05-21 1999-12-10 Sony Corp Noncontact power supply circuit
JP2000295796A (en) * 1999-04-02 2000-10-20 Tokin Corp Non-contact power supply
EP1432097A1 (en) * 2003-10-06 2004-06-23 Siemens Aktiengesellschaft Charging apparatus and method for contactless charging of a mobile unit
JP2005210800A (en) * 2004-01-21 2005-08-04 Riso Kagaku Corp Feeder apparatus
US7733676B2 (en) * 2004-03-30 2010-06-08 Daifuku Co., Ltd. Non-contact power supply system utilizing synchronized command signals to control and correct phase differences amongst power supply units
JP2006230129A (en) * 2005-02-18 2006-08-31 Nanao Corp Noncontact power supply

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* Cited by examiner, † Cited by third party
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CN108462260B (en) * 2011-03-31 2022-01-28 索尼公司 Detector, power transmitter and receiver, and power supply system
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US9553636B2 (en) 2011-05-27 2017-01-24 Nissan Motor Co., Ltd. Contactless electricity supply device with foreign object detector
CN103688442B (en) * 2011-07-21 2017-05-03 索尼公司 Detection device, energy receiver, energy transmitter, power transmission system, and detection method
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CN103378638A (en) * 2012-04-25 2013-10-30 三洋电机株式会社 Contactless method of supplying power
US10763707B2 (en) 2012-07-09 2020-09-01 Samsung Electronics Co., Ltd. Method and apparatus for providing wireless charging power to a wireless power receiver
US9966802B2 (en) 2012-07-09 2018-05-08 Samsung Electronics Co., Ltd Method and apparatus for providing wireless charging power to a wireless power receiver
US11489373B2 (en) 2012-07-09 2022-11-01 Samsung Electronics Co., Ltd. Method and apparatus for providing wireless charging power to a wireless power receiver
CN108539825B (en) * 2012-07-09 2022-03-29 三星电子株式会社 Method and apparatus for providing wireless charging power to a wireless power receiver
CN108539825A (en) * 2012-07-09 2018-09-14 三星电子株式会社 Method and apparatus for providing from wireless charging power to wireless power receiver
CN104471834A (en) * 2012-07-09 2015-03-25 三星电子株式会社 Method and apparatus for providing wireless charging power to a wireless power receiver
CN103997131B (en) * 2013-02-20 2017-04-12 翰林Postech株式会社 Apparatus and method for detecting foreign object in wireless power transmitting system
US10848011B2 (en) 2013-02-20 2020-11-24 Ge Hybrid Technologies, Llc Apparatus and method for detecting foreign object in wireless power transmitting system
CN103997131A (en) * 2013-02-20 2014-08-20 Spacon株式会社 Apparatus and method for detecting foreign object in wireless power transmitting system
US11750040B2 (en) 2013-02-20 2023-09-05 Ge Hybrid Technologies, Llc Apparatus and method for detecting foreign object in wireless power transmitting system
CN105210265A (en) * 2013-03-22 2015-12-30 迪睿合株式会社 Power transmission device, power transmission and receiving device, method for detecting power receiving device, power receiving device detection program, and semiconductor device
CN104953720A (en) * 2014-03-28 2015-09-30 电装波动株式会社 Wireless power supply apparatus for linear motion type robot
CN105005082A (en) * 2014-04-24 2015-10-28 松下电器产业株式会社 Foreign-object detecting device, wireless electric-power transmitting device, and wireless electric-power transmission system
CN105005082B (en) * 2014-04-24 2018-02-23 松下电器产业株式会社 Detection device for foreign matter, wireless power transmission device and Wireless power transmission system
CN105226843A (en) * 2014-05-27 2016-01-06 松下知识产权经营株式会社 The power transmission device of Wireless power transmission system and Wireless power transmission system
CN107257167A (en) * 2014-05-27 2017-10-17 松下知识产权经营株式会社 Power transmission device and wireless power transmission system
WO2015188552A1 (en) * 2014-06-09 2015-12-17 中兴通讯股份有限公司 Foreign substance detection method and device and wireless charging control method and device
US10326317B2 (en) 2014-10-01 2019-06-18 Robert Bosch Gmbh Method for foreign object detection for an induction charging device and induction charging device
CN106796303A (en) * 2014-10-01 2017-05-31 罗伯特·博世有限公司 Foreign matter for induction charging equipment knows method for distinguishing and induction charging equipment
CN108401471A (en) * 2015-11-19 2018-08-14 苹果公司 Induction type power transmitter
CN108401471B (en) * 2015-11-19 2021-06-25 苹果公司 Inductive power transmitter
US10923956B2 (en) 2015-11-19 2021-02-16 Apple Inc. Inductive power transmitter
US11791659B2 (en) 2015-11-19 2023-10-17 Apple Inc. Inductive power transmitter
CN106785832A (en) * 2016-11-25 2017-05-31 深圳市杰普特光电股份有限公司 Pulse optical fiber
TWI642253B (en) * 2017-09-14 2018-11-21 富達通科技股份有限公司 Method and supplying-end module for detecting receiving-end module
CN114207988A (en) * 2019-05-28 2022-03-18 艾拉公司 Adaptive passive PING
CN114207988B (en) * 2019-05-28 2023-03-14 艾拉公司 Adaptive passive PING
CN112394244B (en) * 2019-08-19 2021-09-14 广东美的白色家电技术创新中心有限公司 Detection circuit, electric appliance and control method
CN112394244A (en) * 2019-08-19 2021-02-23 广东美的白色家电技术创新中心有限公司 Detection circuit, electric appliance and control method

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