WO2015064250A1 - ワイヤレス受電装置およびその制御回路、それを用いた電子機器、受信電力の計算方法 - Google Patents
ワイヤレス受電装置およびその制御回路、それを用いた電子機器、受信電力の計算方法 Download PDFInfo
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- WO2015064250A1 WO2015064250A1 PCT/JP2014/075290 JP2014075290W WO2015064250A1 WO 2015064250 A1 WO2015064250 A1 WO 2015064250A1 JP 2014075290 W JP2014075290 W JP 2014075290W WO 2015064250 A1 WO2015064250 A1 WO 2015064250A1
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
- H02J50/10—Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling
- H02J50/12—Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling of the resonant type
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R21/00—Arrangements for measuring electric power or power factor
- G01R21/06—Arrangements for measuring electric power or power factor by measuring current and voltage
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
- H02J50/005—Mechanical details of housing or structure aiming to accommodate the power transfer means, e.g. mechanical integration of coils, antennas or transducers into emitting or receiving devices
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
- H02J50/10—Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
- H02J50/60—Circuit arrangements or systems for wireless supply or distribution of electric power responsive to the presence of foreign objects, e.g. detection of living beings
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
- H02J50/80—Circuit arrangements or systems for wireless supply or distribution of electric power involving the exchange of data, concerning supply or distribution of electric power, between transmitting devices and receiving devices
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/00032—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries characterised by data exchange
- H02J7/00034—Charger exchanging data with an electronic device, i.e. telephone, whose internal battery is under charge
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0047—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with monitoring or indicating devices or circuits
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/40—Testing power supplies
Definitions
- the present invention relates to wireless power feeding technology.
- contactless power transmission also referred to as non-contact power feeding or wireless power feeding
- WPC Wireless Power Consortium
- Qi international standard
- Wireless power supply based on the Qi standard uses electromagnetic induction between the transmission coil and the reception coil.
- the power feeding system includes a power feeding device having a transmission coil and a power receiving terminal having a receiving coil.
- FIG. 1 is a diagram showing a configuration of a wireless power feeding system 100 compliant with the Qi standard.
- the power feeding system 100 includes a power transmission device 200 (TX, Power Transmitter) and a power receiving device 300 (RX, Power Receiver).
- the power receiving device 300 is mounted on an electronic device such as a mobile phone terminal, a smart phone, an audio player, a game device, or a tablet terminal.
- the power transmission device 200 includes a transmission coil (primary coil) 202, a driver 204, a controller 206, and a demodulator 208.
- the driver 204 includes an H-bridge circuit (full-bridge circuit) or a half-bridge circuit, and applies a drive signal S 1, specifically a pulse signal, to the transmission coil 202.
- An electromagnetic field power signal S2 is generated.
- the controller 206 controls the power transmission apparatus 200 as a whole. Specifically, the controller 206 changes the transmission power by controlling the switching frequency of the driver 204 or the switching duty ratio.
- a communication protocol is defined between the power transmission device 200 and the power reception device 300, and information can be transmitted from the power reception device 300 to the power transmission device 200 using the control signal S3.
- This control signal S3 is transmitted from the reception coil 302 (secondary coil) to the transmission coil 202 in the form of AM (Amplitude Modulation) modulation using backscatter modulation.
- the control signal S3 includes, for example, power control data (also referred to as a packet) for instructing the amount of power supplied to the power receiving apparatus 300, data indicating unique information of the power receiving apparatus 300, and the like.
- the demodulator 208 demodulates the control signal S3 included in the current or voltage of the transmission coil 202.
- the controller 206 controls the driver 204 based on the power control data included in the demodulated control signal S3.
- the power receiving apparatus 300 includes a receiving coil 302, a rectifier circuit 304, a smoothing capacitor 306, a modulator 308, a load 310, a controller 312, and a power supply circuit 314.
- the reception coil 302 receives the power signal S ⁇ b> 2 from the transmission coil 202 and transmits a control signal S ⁇ b> 3 to the transmission coil 202.
- the rectifier circuit 304 and the smoothing capacitor 306 rectify and smooth the current S4 induced in the receiving coil 302 according to the power signal S2, and convert it into a DC voltage.
- the power supply circuit 314 uses a power supplied from the power transmission device 200 to charge a secondary battery (not shown), or boosts or steps down the DC voltage VRECT and supplies it to the controller 312 and other loads 310.
- the controller 312 monitors the power supplied to the load 310 and generates power control data instructing the amount of power supplied from the power transmission apparatus 200 accordingly.
- the modulator 308 modulates the control signal S3 including the power control data and modulates the coil current of the reception coil 302, thereby modulating the coil current and the coil voltage of the transmission coil 202.
- foreign object detection FOD: Foreign Object Detection
- a method has been proposed in which transmission power and reception power are measured and the presence or absence of a foreign object is detected based on the comparison result.
- the present inventors initially considered using the power consumption inside the power receiving apparatus 300, specifically, the total power consumption of the power supply circuit 314, the load 310, the control circuit 400, etc., as received power for FOD. did.
- the power consumption inside the power receiving apparatus 300 may not necessarily match the received power of the power receiving apparatus 300.
- the present invention has been made in view of such a problem, and one of exemplary purposes of an aspect thereof is to provide a control circuit for a power receiving apparatus capable of calculating received power with high accuracy.
- the control circuit includes a reception power calculation unit that calculates power consumption PD of the wireless power receiving apparatus based on a predetermined calculation formula, a parameter acquisition unit that acquires the first parameter ⁇ and the second parameter ⁇ from the outside, and a reception A correction unit that calculates the received power PRP of the wireless power receiving apparatus by correcting the power consumption PD calculated by the power calculation unit according to the correction formula ⁇ ⁇ PD + ⁇ .
- the two correction parameters ⁇ and ⁇ based on the shape, structure, and layout of the receiving coil and the shape and material of the casing of the electronic device on which the wireless power receiving apparatus is mounted.
- the received power of the wireless power receiving apparatus can be detected with high accuracy, and as a result, the accuracy of foreign object detection can be improved.
- the parameter acquisition unit may be configured such that a plurality of resistors can be externally attached, and the first parameter ⁇ and the second parameter ⁇ can be acquired according to the resistance values of the plurality of connected resistors.
- the parameter acquisition unit includes a voltage conversion unit that converts resistance values of a plurality of resistors into a plurality of voltages, and an A / D converter that converts each of the plurality of voltages into a plurality of digital values.
- the first parameter ⁇ and the second parameter ⁇ may be taken in.
- the plurality of resistors may be connected in series to form a resistor string.
- the voltage conversion unit may include a plurality of setting terminals connected to the terminals of the plurality of resistors, and a current source that supplies a constant current to the resistor string.
- the A / D converter may convert the voltage of the plurality of setting terminals and / or the potential difference between the plurality of setting terminals into a digital value.
- the parameter acquisition unit includes a plurality of setting terminals to which a plurality of resistors are connected, a plurality of current conversion units that are provided in association with the plurality of resistors, and each generate a current that is inversely proportional to the resistance value of the corresponding resistor, A voltage conversion unit that is provided in association with a plurality of current conversion units, and that converts the current generated by the corresponding current conversion unit into a voltage.
- the parameter acquisition unit may include an interface circuit that receives serial data including the first parameter ⁇ and the second parameter ⁇ from an external processor, and a register that stores the first parameter ⁇ and the second parameter ⁇ .
- the reception power calculation unit may include a load current measurement unit that measures a current ILOAD flowing through the wireless power reception apparatus, and may calculate the power consumption PD based on a predetermined function fD (ILOAD).
- the wireless power receiving apparatus may include a receiving coil, a rectifying circuit that rectifies the current flowing through the receiving coil, and a smoothing capacitor that is connected to the output of the rectifying circuit and generates the rectified voltage VRECT.
- the current ILOAD may be a current that flows from the smoothing capacitor to the load.
- the function fD (ILOAD) may include a term of (VRECT ⁇ ILOAD).
- the function fD may further include a term of RON ⁇ ILOAD2 with a predetermined constant as RON.
- the control circuit may include a power supply current measuring unit that measures the operating current IDD of the control circuit itself, and a voltage measuring unit that measures the power supply voltage VDD supplied to the control circuit.
- the function fD (ILOAD) may further include a term (VDD ⁇ IDD).
- the control circuit may operate using the rectified voltage VRECT as the power supply voltage VDD.
- the control circuit may conform to the Qi standard.
- the control circuit may be integrated on a single semiconductor substrate. “Integrated integration” includes the case where all of the circuit components are formed on a semiconductor substrate and the case where the main components of the circuit are integrated. A resistor, a capacitor, or the like may be provided outside the semiconductor substrate. By integrating the circuit as one IC (Integrated Circuit), the circuit area can be reduced and the characteristics of the circuit elements can be kept uniform.
- the wireless power receiving apparatus includes a receiving coil, a rectifying circuit that rectifies a current flowing through the receiving coil, a smoothing capacitor that is connected to an output of the rectifying circuit and generates a rectified voltage VRECT, and any one of the control circuits described above. .
- the control circuit includes a current detection unit that detects a current I flowing through a predetermined path, and a received power calculation unit that calculates the power consumption PD of the wireless power receiving apparatus based on a predetermined function fD (I) using the current I as an argument.
- a range of the current I is divided into N sections (N is an integer of 2 or more), and a parameter acquisition unit that acquires parameters ⁇ 1 to ⁇ N designated for each of the divided sections from the outside, and a current I Is included in the i-th section, the correction unit calculates the reception power PRP of the wireless power receiving apparatus by correcting the power consumption PD calculated by the reception power calculation unit using the parameter ⁇ i.
- the current I is divided into a plurality of sections, and the parameters for each section are determined based on the shape, structure, layout of the receiving coil, and the shape and material of the casing of the electronic device on which the wireless power receiving apparatus is mounted.
- the jth parameter ⁇ j may be used to correct the slope of the received power PRPj with respect to the current I in the jth interval.
- the slope of the received power PRPj with respect to the current I can be adjusted for each section, and the calculated received power can be accurately fitted to the actual received power.
- PRP2 ⁇ 2 ⁇ fD (I ⁇ I1) + ⁇ 1 ⁇ fD (I1)
- PRP3 ⁇ 3 ⁇ fD (I ⁇ I2) + ⁇ 2 ⁇ fD (I2 ⁇ I1) + ⁇ 1 ⁇ fD (I1) ...
- the reception power PRP can be made continuous at the boundary of the section.
- the parameter acquisition unit may be configured to be able to acquire the parameter ⁇ from the outside in addition to the parameters ⁇ 1 to ⁇ N.
- the correction unit may add the parameter ⁇ to the received power PPR. As a result, the calculated received power can be accurately fitted to the actual received power.
- the parameter acquisition unit may be further configured to be able to acquire data specifying the threshold values I1 to IN-1 from the outside.
- the range of each of the plurality of sections can be set based on the shape, structure, layout of the receiving coil, the shape or material of the casing of the electronic device on which the wireless power receiving device is mounted, Received power can be calculated with high accuracy.
- the parameter acquisition unit may include an interface circuit that receives serial data including an external parameter from an external processor, and a register that stores the received parameter.
- the parameter acquisition unit may be configured such that a plurality of resistors can be externally attached, and parameters can be acquired according to the resistance values of the plurality of resistors connected thereto.
- the received power calculation unit may include a load current measurement unit that measures a current ILOAD that flows through the load of the wireless power receiving apparatus, and may calculate the power consumption PD based on a predetermined function fD (ILOAD).
- the current detection unit may be configured to measure a current ILOAD flowing through the load of the wireless power receiving apparatus.
- the function fD (I) may be defined with the current ILOAD as an argument.
- the control circuit may conform to the Qi standard.
- the control circuit may be integrated on a single semiconductor substrate. “Integrated integration” includes the case where all of the circuit components are formed on a semiconductor substrate and the case where the main components of the circuit are integrated. A resistor, a capacitor, or the like may be provided outside the semiconductor substrate. By integrating the circuit as one IC (Integrated Circuit), the circuit area can be reduced and the characteristics of the circuit elements can be kept uniform.
- the wireless power receiving apparatus includes a receiving coil, a rectifying circuit that rectifies a current flowing through the receiving coil, a smoothing capacitor that is connected to an output of the rectifying circuit and generates a rectified voltage VRECT, and any one of the control circuits described above. .
- the received power of the wireless power receiving apparatus can be calculated with high accuracy.
- FIG. 11 illustrates an electronic device including a power receiving device.
- the state in which the member A is connected to the member B means that the member A and the member B are electrically connected to each other in addition to the case where the member A and the member B are physically directly connected. It includes cases where the connection is indirectly made through other members that do not substantially affect the general connection state, or that do not impair the functions and effects achieved by their combination.
- the state in which the member C is provided between the member A and the member B refers to the case where the member A and the member C or the member B and the member C are directly connected, as well as their electric It includes cases where the connection is indirectly made through other members that do not substantially affect the general connection state, or that do not impair the functions and effects achieved by their combination.
- FIG. 2 is a block diagram of an electronic device 500 including the power receiving device 300 according to the first embodiment.
- the power receiving apparatus 300 receives the power signal S2 from the power transmitting apparatus 200, stores the energy in the smoothing capacitor 306, and supplies the energy to the load 502.
- the load 502 includes a power supply circuit 504, a secondary battery 506, and various processors 508.
- the power receiving apparatus 300 includes a receiving coil 302, a smoothing capacitor 306, a modulator 308, and a control circuit 400.
- the power receiving apparatus 300 in FIG. 2 is used in the power supply system 100 that complies with the Qi standard in FIG.
- the reception coil 302 receives the power signal S ⁇ b> 2 from the transmission coil 202 and transmits a control signal S ⁇ b> 3 to the transmission coil 202.
- the rectifier circuit 304 and the smoothing capacitor 306 rectify and smooth the current S4 induced in the receiving coil 302 in accordance with the power signal S2, and convert it into a DC voltage VRECT.
- the power supply circuit 504 includes a charging circuit that charges the secondary battery 506 using the power supplied from the power transmission apparatus 200 and / or a DC / DC converter that boosts or steps down the DC voltage VRECT and supplies the DC voltage VRECT to the processor 508. .
- the control circuit 400 includes a received power calculation unit 402, a parameter acquisition unit 404, a correction unit 406, a control data generation unit 408, a load current measurement unit 410, a voltage measurement unit 412, and a power supply current measurement unit 414, and is provided on one semiconductor substrate. It is integrated.
- the received power calculation unit 402 calculates the power consumption PD of the wireless power receiving apparatus 300 based on a predetermined calculation formula.
- the parameter acquisition unit 404 acquires the first parameter ⁇ and the second parameter ⁇ from the outside of the control circuit 400.
- the correcting unit 406 calculates the received power PRP of the wireless power receiving apparatus 300 by correcting the power consumption PD calculated by the received power calculating unit 402 according to the following correction formula.
- PRP ⁇ ⁇ PD + ⁇
- the control data generation unit 408 generates control data DRP indicating the reception power of the power receiving apparatus 300 based on the reception power PRP calculated by the correction unit 406. This control data is transmitted to the power transmission device 200 via the modulator 308 and the receiving coil 302. The power transmission device 200 detects a foreign object based on the control data DRP.
- the received power calculation unit 403 calculates the power supplied from the smoothing capacitor 306 to the load 502.
- the control data generation unit 408 generates power control data DPC based on the reception power calculated by the reception power calculation unit 403.
- the power control data DPC is transmitted to the power transmission device 200 via the modulator 308 and the reception coil 302.
- the power transmission device 200 controls transmission power based on the power control data DPC.
- the load current measuring unit 410, the voltage measuring unit 412, and the power source current measuring unit 414 measure the voltage or current amount necessary for calculating the power consumption PD.
- the load current measuring unit 410 measures a current ILOAD that flows through the wireless power receiving apparatus 300.
- the load current ILOAD may be a current that flows from the smoothing capacitor 306 to the load 502.
- the received power calculation unit 402 may calculate the power consumption PD based on at least a predetermined function fD (ILOAD) having the load current ILOAD as an argument.
- ILOAD predetermined function fD
- the DC voltage VRECT is supplied to the power supply terminal VDD of the control circuit 400.
- the voltage measuring unit 412 measures the DC voltage VRECT generated in the smoothing capacitor 306.
- the power supply current measuring unit 414 measures the power supply current IDD flowing through the power supply terminal VDD of the control circuit 400.
- the reception power calculation unit 402 calculates the power consumption PD according to the following function fD (ILOAD).
- the first term VRECT ⁇ ILOAD on the right side is the power consumption of the load 502.
- the second term RON ⁇ ILOAD2 on the right side is a power loss.
- RON is a predetermined constant and has an impedance dimension.
- the third term VDD ⁇ IDD on the right side is the power consumption of the control circuit 400.
- the DC voltage VRECT is supplied to the power supply terminal VDD of the control circuit 400, that is, the control circuit 400 operates using the rectified voltage VRECT as a power supply.
- VDD VRECT.
- FIG. 3 is a circuit diagram illustrating a configuration example of the parameter acquisition unit 404.
- the parameter acquisition unit 404 is configured such that a plurality of resistors R ⁇ and R ⁇ can be externally attached.
- the parameter acquisition unit 404 is configured to be able to acquire the first parameter ⁇ and the second parameter ⁇ according to the resistance values of the plurality of resistors R ⁇ and R ⁇ connected thereto.
- the parameter acquisition unit 404 includes a voltage conversion unit 420 and an A / D converter 422.
- the voltage converter 420 converts resistance values of the plurality of resistors R ⁇ and R ⁇ into a plurality of voltages V ⁇ and V ⁇ .
- the A / D converter 422 converts each of the plurality of voltages V ⁇ and V ⁇ into a plurality of digital values D ⁇ and D ⁇ .
- a selector 426 may be provided in the preceding stage of the A / D converter 422, and a single A / D converter 422 may be configured to convert a plurality of voltages V ⁇ and V ⁇ into digital values D ⁇ and D ⁇ in a time division manner.
- the digital values D ⁇ and D ⁇ are stored in the register 424 as the first parameter ⁇ and the second parameter ⁇ .
- the voltage converter 420 includes a plurality of setting terminals P1 to P2 and a current source 428.
- the plurality of resistors R ⁇ and R ⁇ are connected in series between the setting terminal P1 and an external ground terminal so as to form a resistor string.
- the plurality of setting terminals P1 and P2 are connected to the terminals (resistance string taps) of the plurality of resistors R ⁇ and R ⁇ .
- the current source 428 is connected to the setting terminal P1, and supplies a predetermined constant current Ic to the resistor strings R ⁇ and R ⁇ .
- the A / D converter 422 may convert the voltage of each setting terminal or the potential difference between at least one setting terminal into a digital value.
- the A / D converter 422 converts the voltage drop V ⁇ that is the potential difference between the setting terminals P1 and P2 and the voltage drop V ⁇ that is the potential of the setting terminal P2 into digital values.
- the above is the configuration of the power receiving device 300.
- FIG. 4A and 4B are diagrams illustrating received power PRP in the power receiving apparatus 300.
- FIG. The horizontal axis represents the load current ILOAD, and the vertical axis represents the received power PRP.
- the received power PRP given by the function fD described above includes a non-linear term, but here the received power PRP is shown by a straight line for the purpose of facilitating understanding and simplifying the explanation.
- the received power PRP calculated based on a predetermined function fD (ILOAD) can be corrected in the intercept direction as shown in FIG.
- the slope of the predetermined function fD (ILOAD) can be changed as shown in FIG.
- the shape and structure of the receiving coil used together with the control circuit 400 are unknown, and the shape and material of the casing of the electronic device on which the power receiving device 300 is mounted are also unknown. Therefore, the predetermined arithmetic expression is determined without considering the receiving coil and the housing. However, as described above, the receiving coil and the housing affect the received power of the power receiving device 300.
- the parameters ⁇ and ⁇ are optimized so that correct received power can be obtained in a state where the power receiving device 300 is mounted on an electronic device.
- the received power PRP can be detected with high accuracy.
- the received power PRP obtained through the correction process is transmitted to the power transmission device 200 and compared with the transmission power PTP of the power transmission device 200, thereby improving the accuracy of foreign object detection.
- the parameters ⁇ and ⁇ are instructed to the parameter acquisition unit 404 using an external resistor.
- the designer of the electronic device can easily change the parameters ⁇ and ⁇ by changing the resistance values of the resistors R ⁇ and R ⁇ .
- the configuration of the parameter acquisition unit 404 is not limited to that of FIG. 5 and 6 are circuit diagrams showing another configuration example of the parameter acquisition unit 404.
- FIG. The parameter acquisition unit 404a in FIG. 6 is provided for each of the resistors R ⁇ and R ⁇ .
- a resistor R ⁇ is connected between the setting terminal P1 and the ground terminal, and a resistor R ⁇ is connected between the setting terminal P2 and the ground terminal.
- the parameter acquisition unit 404a includes a plurality of current conversion units 430 and a plurality of voltage conversion units 440.
- the plurality of current conversion units 430 and the plurality of voltage conversion units 440 are provided corresponding to the plurality of setting terminals P1 and P2.
- the current converter 430 generates a current I ⁇ that is inversely proportional to the resistance value of the resistor R ⁇ connected to the corresponding setting terminal P1.
- the voltage converter 440 converts the current I ⁇ generated by the corresponding current converter 430 into a voltage V ⁇ that is proportional to the current I ⁇ .
- the current conversion unit 430 includes a transistor M1 and an operational amplifier OA1.
- a current I ⁇ VREF / R ⁇ flows through the transistor M1 and the resistor R ⁇ .
- the voltages V ⁇ and V ⁇ are supplied to an A / D converter (not shown) and converted into digital values ⁇ and ⁇ .
- the parameters ⁇ and ⁇ can be set from the outside of the control circuit 400 according to the resistance value.
- the parameter acquisition unit 404b of FIG. 6 includes an interface circuit 450 that receives serial data including the first parameter ⁇ and the second parameter ⁇ from the external processor 301, and a register 452 that stores the first parameter ⁇ and the second parameter ⁇ . And may be included.
- the parameter acquisition unit 404 may include a non-volatile memory and write parameters to the non-volatile memory at the design stage of the electronic device.
- the received power PPR is calculated according to the following function, but the present invention is not limited to this.
- VDD ⁇ IDD may be omitted.
- RON ⁇ ILOAD2 may be omitted.
- the received power calculation unit 402 may be defined as a function having a value other than the load current ILOAD as an argument.
- the wireless power transmission apparatus conforming to the Qi standard has been described.
- the present invention is not limited thereto, and the power receiving apparatus 300 used in a system similar to the Qi standard or a standard that will be established in the future.
- the present invention can also be applied to a compliant power receiving device 300.
- a part of the modulator 308 and the power supply circuit 504 may be further integrated in an IC in which the control circuit 400 is integrated.
- the load current measuring unit 410 detects a current I flowing through a predetermined path.
- the reception power calculation unit 402 calculates the power consumption PD of the wireless power receiving apparatus 300 based on a predetermined function fD (I) with the current I as an argument.
- the parameter acquisition unit 404 acquires parameters (hereinafter also referred to as first parameters) ⁇ 1 to ⁇ N designated for each divided section from the outside.
- the correction unit 406 corrects the power consumption PD calculated by the reception power calculation unit 402 using the first parameter ⁇ i, whereby the reception power of the wireless power receiving apparatus 300 is corrected. Calculate PRP.
- the jth parameter ⁇ j is used to correct the slope of the received power PRPj with respect to the current I in the jth section.
- PRP2 ⁇ 2 ⁇ fD (I ⁇ I1) + ⁇ 1 ⁇ fD (I1)
- PRP3 ⁇ 3 ⁇ fD (I ⁇ I2) + ⁇ 2 ⁇ fD (I2 ⁇ I1) + ⁇ 1 ⁇ fD (I1) ...
- PRPj ⁇ j ⁇ fD (I ⁇ Ij ⁇ 1) + PRPj ⁇ 1 (Ij ⁇ 1)
- the parameter acquisition unit 404 is configured to be able to acquire a parameter (also referred to as a second parameter) ⁇ from the outside in addition to the plurality of parameters ⁇ 1 to ⁇ N.
- the correcting unit 48 adds the parameter ⁇ to the received power PRP.
- the control data generation unit 408 generates control data DRP indicating the reception power of the power receiving apparatus 300 based on the reception power PRP calculated by the correction unit 406. This control data is transmitted to the power transmission device 200 via the modulator 308 and the receiving coil 302. The power transmission device 200 detects a foreign object based on the control data DRP.
- the received power calculation unit 403 calculates the power supplied from the smoothing capacitor 306 to the load 502.
- the control data generation unit 408 generates power control data DPC based on the reception power calculated by the reception power calculation unit 403.
- the power control data DPC is transmitted to the power transmission device 200 via the modulator 308 and the reception coil 302.
- the power transmission device 200 controls transmission power based on the power control data DPC.
- the load current measuring unit 410, the voltage measuring unit 412, and the power source current measuring unit 414 measure the voltage or current amount necessary for calculating the power consumption PD.
- the load current measurement unit 410 measures a current ILOAD that flows through a predetermined path of the wireless power receiving apparatus 300.
- the load current ILOAD may be a current that flows from the smoothing capacitor 306 to the load 502.
- the DC voltage VRECT is supplied to the power supply terminal VDD of the control circuit 400.
- the voltage measuring unit 412 measures the DC voltage VRECT generated in the smoothing capacitor 306.
- the power supply current measuring unit 414 measures the power supply current IDD flowing through the power supply terminal VDD of the control circuit 400.
- the reception power calculation unit 402 calculates the power consumption PD according to the following function fD (ILOAD).
- the first term VRECT ⁇ ILOAD on the right side is the power consumption of the load 502.
- the second term RON ⁇ ILOAD2 on the right side is a power loss.
- RON is a predetermined constant and has an impedance dimension.
- the third term VDD ⁇ IDD on the right side is the power consumption of the control circuit 400.
- the DC voltage VRECT is supplied to the power supply terminal VDD of the control circuit 400, that is, the control circuit 400 operates using the rectified voltage VRECT as a power supply.
- VDD VRECT.
- FIG. 6 shows a configuration example of the parameter acquisition unit 404b.
- the parameter acquisition unit 404b in FIG. 6 includes an interface circuit 450 and a register 452.
- the interface circuit 450 receives serial data including the first parameters ⁇ 1 to ⁇ N and the second parameter ⁇ from the external processor 301.
- the register 452 stores the first parameters ⁇ 1 to ⁇ N and the second parameter ⁇ .
- the parameter acquisition unit 404 may include a non-volatile memory and write parameters to the non-volatile memory at the design stage of the electronic device.
- FIG. 7A and 7B are diagrams illustrating received power PRP in the power receiving apparatus 300.
- FIG. The horizontal axis represents the load current ILOAD, and the vertical axis represents the received power PRP.
- the received power PRP given by the function fD described above includes a non-linear term.
- the received power PRP is shown by a straight line for the purpose of facilitating understanding and simplifying the explanation.
- the current ILOAD is divided into three sections, and the received power PRP can be corrected according to the three parameters ⁇ 1 to ⁇ 3.
- the received power PRPj shown in FIGS. 7A and 7B satisfies the following expression.
- PRPj ⁇ j ⁇ fD (I ⁇ Ij ⁇ 1) + PRPj ⁇ 1 (Ij ⁇ 1) + ⁇
- the received power PRP calculated based on the predetermined function fD (ILOAD) and the parameters ⁇ 1 to ⁇ N is corrected in the intercept direction. Can do.
- the shape and structure of the receiving coil used together with the control circuit 400 are unknown, and the shape and material of the casing of the electronic device on which the power receiving device 300 is mounted are also unknown. Therefore, the predetermined function fD (ILOAD) is determined without considering the receiving coil and the housing. However, as described above, the receiving coil and the housing affect the received power of the power receiving device 300.
- the influence of the shape, material, and layout of the receiving coil or the shape and material of the casing of the electronic device on the received power is the magnitude of the received power, that is, the current. It depends on the size of ILOAD.
- the wireless power receiving apparatus 300 is optimized. Can be detected with high accuracy. Then, the received power PRP obtained through the correction process is transmitted to the power transmission device 200 and compared with the transmission power PTP of the power transmission device 200, thereby improving the accuracy of foreign object detection.
- the received power PRP can be detected with higher accuracy by using the second parameter ⁇ together.
- the parameter acquisition unit 404 is configured to be able to acquire data instructing the threshold values I1 to IN-1 in addition to the parameters ⁇ 1 to ⁇ N and ⁇ from the outside.
- the range of each of the plurality of sections can be set based on the shape, structure, layout of the receiving coil, the shape or material of the casing of the electronic device on which the wireless power receiving device is mounted, Furthermore, the received power can be calculated with high accuracy.
- the parameter ⁇ for setting the intercept is common to all the sections, and the parameters ⁇ 1 to ⁇ N for setting the slope can be set for each section.
- the present invention is not limited to this.
- the parameter ⁇ may be set for each section.
- the received power PRP calculated by the correction using the parameter may be discontinuous at the boundary of the section.
- FIG. 8 is a circuit diagram showing another configuration example of the parameter acquisition unit 404.
- the parameter acquisition unit 404 is configured to be able to acquire the first parameters ⁇ 1 to ⁇ N and the second parameter ⁇ according to the resistance values of the plurality of connected resistors.
- the parameter acquisition unit 404 includes a voltage conversion unit 420 and an A / D converter 422.
- the voltage converter 420 converts resistance values of the plurality of resistors R ⁇ 1 to R ⁇ N and R ⁇ into a plurality of voltages V ⁇ 1 to V ⁇ N and V ⁇ .
- the A / D converter 422 converts each of the plurality of voltages V ⁇ 1 to V ⁇ N and V ⁇ into a plurality of digital values D ⁇ 1 to D ⁇ N and D ⁇ .
- a selector 426 is provided in the preceding stage of the A / D converter 422, and a single A / D converter 422 may be configured to convert a plurality of voltages V ⁇ 1 to V ⁇ N, V ⁇ into digital values D ⁇ 1 to D ⁇ N, D ⁇ in a time division manner. Good.
- the digital values D ⁇ 1 to D ⁇ N and D ⁇ are stored in the register 424 as the first parameters ⁇ 1 to ⁇ N and the second parameter ⁇ .
- the voltage converter 420 includes a plurality of setting terminals P1 to P4 and a current source 428.
- the plurality of resistors R ⁇ 1 to R ⁇ N, R ⁇ are connected in series between the setting terminal P1 and an external ground terminal so as to form a resistor string.
- the plurality of setting terminals P1 to P4 are connected to terminals of a plurality of resistors R ⁇ 1 to R ⁇ N and R ⁇ (resistor string taps).
- the current source 428 is connected to the setting terminal P1, and supplies a predetermined constant current Ic to the resistor strings R ⁇ 1 to R ⁇ N and R ⁇ .
- the A / D converter 422 may convert the voltage of each setting terminal or the potential difference between at least one setting terminal into a digital value.
- the parameter values can be arbitrarily set by changing the resistance values of the resistors R ⁇ 1 to R ⁇ N and R ⁇ externally attached to the control circuit 400.
- a resistor R ⁇ is connected between the setting terminal P1 and the ground terminal, and a resistor R ⁇ is connected between the setting terminal P2 and the ground terminal.
- the parameter acquisition unit 404a includes a plurality of current conversion units 430 and a plurality of voltage conversion units 440.
- the plurality of current conversion units 430 and the plurality of voltage conversion units 440 are provided corresponding to the plurality of setting terminals P1 and P2.
- the current converter 430 generates a current I ⁇ that is inversely proportional to the resistance value of the resistor R ⁇ connected to the corresponding setting terminal P1.
- the voltage converter 440 converts the current I ⁇ generated by the corresponding current converter 430 into a voltage V ⁇ that is proportional to the current I ⁇ .
- the current conversion unit 430 includes a transistor M1 and an operational amplifier OA1.
- a current I ⁇ VREF / R ⁇ flows through the transistor M1 and the resistor R ⁇ .
- the voltages V ⁇ and V ⁇ are supplied to an A / D converter (not shown) and converted into digital values ⁇ and ⁇ .
- the parameters ⁇ and ⁇ can be set according to the resistance value from the outside.
- the received power PPR is calculated according to the following function, but the present invention is not limited to this.
- VDD ⁇ IDD may be omitted.
- RON ⁇ ILOAD2 may be omitted.
- the received power calculation unit 402 may be defined as a function having a value other than the load current ILOAD as an argument.
- the wireless power transmission apparatus conforming to the Qi standard has been described.
- the present invention is not limited thereto, and the power receiving apparatus 300 used in a system similar to the Qi standard or a standard that will be established in the future.
- the present invention can also be applied to a compliant power receiving device 300.
- a part of the modulator 308 and the power supply circuit 504 may be further integrated in an IC in which the control circuit 400 is integrated.
- the received power PRPj shown in FIGS. 7A and 7B satisfies the following expression.
- PRPj ⁇ j ⁇ fD (I ⁇ Ij ⁇ 1) + PRPj ⁇ 1 (Ij ⁇ 1) + ⁇
- the control circuit 400 includes a current detection unit (410) that detects a current I flowing through a predetermined path, and the range of the current I is divided into N sections (N is an integer of 2 or more).
- FIG. 9 is a diagram illustrating an electronic device 500 including the power receiving device 300.
- An electronic device 500 in FIG. 9 is a smart phone, a tablet PC, a portable game machine, or a portable audio player.
- a power circuit 504 Inside the housing 501, a power circuit 504, a secondary battery 506, a processor 508, a display device 510, and The power receiving device 300 described above is incorporated.
- the processor 508 may include a radio (RF) unit, a baseband processor, an application processor, an audio processor, and the like.
- RF radio
- DESCRIPTION OF SYMBOLS 100 Power feeding system, 200, TX ... Power transmission apparatus, 201 ... Transmitting antenna, 202 ... Transmitting coil, 203 ... Resonance capacitor, 204 ... Driver, 206 ... Controller, 208 ... Demodulator, 300, RX ... Power receiving apparatus, 302 ... Reception Coil, 304 ... rectifier circuit, 306 ... smoothing capacitor, 308 ... modulator, 400 ... control circuit, 402, 403 ... received power calculation unit, 404 ... parameter acquisition unit, 406 ... correction unit, 408 ... control data generation unit, 410 ... Load current measurement unit, 412 ... Voltage measurement unit, 414 ... Power supply current measurement unit, S1 ...
- the present invention relates to wireless power feeding technology.
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Abstract
Description
関数fD(ILOAD)は、(VRECT×ILOAD)の項を含んでもよい。
制御回路は、整流電圧VRECTを、電源電圧VDDとして動作してもよい。
「一体集積化」とは、回路の構成要素のすべてが半導体基板上に形成される場合や、回路の主要構成要素が一体集積化される場合が含まれ、回路定数の調節用に一部の抵抗やキャパシタなどが半導体基板の外部に設けられていてもよい。回路を1つのIC(Integrated Circuit)として集積化することにより、回路面積を削減することができるとともに、回路素子の特性を均一に保つことができる。
この態様によれば、区間ごとに、電流Iに対する受信電力PRPjの傾きを調節することができ、計算された受信電力を、実際の受信電力に精度良くフィッティングさせることができる。
PRP1=α1×fD(I)
PRP2=α2×fD(I-I1)+α1×fD(I1)
PRP3=α3×fD(I-I2)+α2×fD(I2-I1)+α1×fD(I1)
・・・
にしたがって計算してもよい。
これにより、区間の境界で受信電力PRPを連続とすることができる。
これにより計算された受信電力を、実際の受信電力に精度良くフィッティングさせることができる。
この態様によれば、複数の区間それぞれの範囲を、受信コイルの形状、構造、レイアウトや、ワイヤレス受電装置を搭載する電子機器の筐体の形状や材料などにもとづいて設定可能となるため、さらに高精度に受信電力を計算できる。
「一体集積化」とは、回路の構成要素のすべてが半導体基板上に形成される場合や、回路の主要構成要素が一体集積化される場合が含まれ、回路定数の調節用に一部の抵抗やキャパシタなどが半導体基板の外部に設けられていてもよい。回路を1つのIC(Integrated Circuit)として集積化することにより、回路面積を削減することができるとともに、回路素子の特性を均一に保つことができる。
同様に、「部材Cが、部材Aと部材Bの間に設けられた状態」とは、部材Aと部材C、あるいは部材Bと部材Cが直接的に接続される場合のほか、それらの電気的な接続状態に実質的な影響を及ぼさない、あるいはそれらの結合により奏される機能や効果を損なわせない、その他の部材を介して間接的に接続される場合も含む。
図2は、第1の実施の形態に係る受電装置300を備える電子機器500のブロック図である。受電装置300は、送電装置200からの電力信号S2を受信し、そのエネルギーを平滑コンデンサ306に蓄え、負荷502に供給する。負荷502は、電源回路504、二次電池506、各種プロセッサ508を含む。
PRP=α×PD+β
RD=fD(ILOAD)=VRECT×ILOAD+RON×ILOAD2+VDD×IDD
右辺第2項RON×ILOAD2は、電力損失である。RONは所定の定数であり、インピーダンスのディメンジョンを有する。
右辺第3項VDD×IDDは、制御回路400の消費電力である。本実施の形態では、制御回路400の電源端子VDDには、直流電圧VRECTが供給され、つまり制御回路400は整流電圧VRECTを電源として動作する。この場合、VDD=VRECTとなる。
図3は、パラメータ取得部404の構成例を示す回路図である。
パラメータ取得部404は、複数の抵抗Rα、Rβが外付け可能に構成される。パラメータ取得部404は、接続される複数の抵抗Rα、Rβそれぞれの抵抗値に応じて、第1パラメータα、第2パラメータβを取得可能に構成される。
パラメータ取得部404の構成は、図3のそれには限定されない。
図5、図6は、パラメータ取得部404の別の構成例を示す回路図である。図6のパラメータ取得部404aは、抵抗Rα、Rβごとに設けられる。設定端子P1と接地端子の間には、抵抗Rαが接続され、設定端子P2と接地端子の間には、抵抗Rβが接続される。
複数の電流変換部430および複数の電圧変換部440は、複数の設定端子P1、P2に対応して設けられる。電流変換部430は、対応する設定端子P1に接続される抵抗Rαの抵抗値に反比例した電流Iαを生成する。電圧変換部440は、対応する電流変換部430が生成した電流Iαを、それに比例した電圧Vαに変換する。
実施の形態では、以下の関数にしたがって受信電力PPRを計算することとしたが本発明はそれには限定されない。
PD=fD(ILOAD)=VRECT×ILOAD+RON×ILOAD2+VDD×IDD
制御回路400の消費電力が無視しうる場合、VDD×IDDの項は省略してもよい。あるいは、熱的な損失が無視しうる場合、RON×ILOAD2の項は省略してもよい。
実施の形態では、Qi規格に準拠するワイヤレス送電装置について説明したが、本発明はそれに限定されず、Qi規格と類似するシステムに使用される受電装置300や、将来策定されるであろう規格に準拠する受電装置300にも適用しうる。
制御回路400が集積化されるICには、変調器308や電源回路504の一部がさらに集積化されてもよい。
第2の実施の形態に係る受電装置300、制御回路400の基本構成は、図2で示す第1の実施の形態と同様である。以下、相違点のみを説明する。
PRP1=α1×fD(I)
PRP2=α2×fD(I-I1)+α1×fD(I1)
PRP3=α3×fD(I-I2)+α2×fD(I2-I1)+α1×fD(I1)
・・・
にしたがって計算する。
一般化すると、以下の式を得る。
PRPj=αj×fD(I-Ij-1)+PRPj-1(Ij-1)
ただし、IRP0=0、I0=0とする。
補正部48は、受信電力PRPにパラメータβを加算する。
PD=fD(ILOAD)=VRECT×ILOAD+RON×ILOAD2+VDD×IDD
右辺第2項RON×ILOAD2は、電力損失である。RONは所定の定数であり、インピーダンスのディメンジョンを有する。
右辺第3項VDD×IDDは、制御回路400の消費電力である。本実施の形態では、制御回路400の電源端子VDDには、直流電圧VRECTが供給され、つまり制御回路400は整流電圧VRECTを電源として動作する。この場合、VDD=VRECTとなる。
PRPj=αj×fD(I-Ij-1)+PRPj-1(Ij-1)+β
ただし、IRP0=0、I0=0とする。
また電流ILOADに対する受信電力PRPの傾きを、関数fD(ILOAD)よりも大きくしたい場合、図7(a)の第3区間I2<ILOADに示すように、α3>1とすればよい。
また電流ILOADに対する受信電力PRPの傾きを、関数fD(ILOAD)と同一としたい場合、図7(a)の第2区間I1<ILOAD<I2に示すように、α2=1とすればよい。
実施の形態では、外部からパラメータα1~αN、βを設定可能とした場合を説明したが本発明はそれには限定されない。たとえば、パラメータα1~αNに加えて、電流区間の境界I1、I2、…IN-1を設定可能としてもよい。つまりパラメータ取得部404は、外部からパラメータα1~αN、βに加えて、しきい値I1~IN-1を指示するデータを取得可能に構成される。
実施の形態では、切片を設定するパラメータβを、すべての区間で共通とし、傾きを設定するパラメータα1~αNを区間ごとに設定可能としたが本発明はそれには限定されない。たとえばパラメータβを、区間ごとに設定可能としてもよい。また、パラメータを用いた補正により計算された受信電力PRPは、区間の境界において不連続であってもよい。
本実施の形態では、パラメータ取得部404に対するパラメータα、βの指示を、シリアルインタフェースを用いて行うこととしたが、本発明はそれには限定されない。たとえばパラメータα、βの指示を、外付けの抵抗を用いて行うことしてもよい。図8は、パラメータ取得部404の別の構成例を示す回路図である。
複数の電流変換部430および複数の電圧変換部440は、複数の設定端子P1、P2に対応して設けられる。電流変換部430は、対応する設定端子P1に接続される抵抗Rαの抵抗値に反比例した電流Iαを生成する。電圧変換部440は、対応する電流変換部430が生成した電流Iαを、それに比例した電圧Vαに変換する。
実施の形態では、以下の関数にしたがって受信電力PPRを計算することとしたが本発明はそれには限定されない。
PD=fD(ILOAD)=VRECT×ILOAD+RON×ILOAD2+VDD×IDD
制御回路400の消費電力が無視しうる場合、VDD×IDDの項は省略してもよい。あるいは、熱的な損失が無視しうる場合、RON×ILOAD2の項は省略してもよい。
実施の形態では、Qi規格に準拠するワイヤレス送電装置について説明したが、本発明はそれに限定されず、Qi規格と類似するシステムに使用される受電装置300や、将来策定されるであろう規格に準拠する受電装置300にも適用しうる。
制御回路400が集積化されるICには、変調器308や電源回路504の一部がさらに集積化されてもよい。
第2の実施の形態およびその変形例で説明した制御回路400は、以下のように把握することも可能である。
PRPj=αj×fD(I-Ij-1)+PRPj-1(Ij-1)+β
ただし、IRP0=0、I0=0とする。
制御回路400は、所定の経路に流れる電流Iを検出する電流検出部(410)と、電流Iの範囲がN個(Nは2以上の整数)の区間に分割されており、分割された区間ごとに指定されるパラメータα1~αNを外部から取得するパラメータ取得部(404)と、j番目の区間におけるワイヤレス受電装置の受信電力PPRjを、電流Iを引数とし、パラメータαj~αNを用いて定義される区間ごとに固有の関数にもとづいて計算する受信電力演算部(402、406)と、を備える。
Claims (34)
- ワイヤレス受電装置の制御回路であって、
前記ワイヤレス受電装置の消費電力PDを、所定の演算式にもとづいて計算する受信電力演算部と、
外部から、第1パラメータα、第2パラメータβを取得するパラメータ取得部と、
前記ワイヤレス受電装置の受信電力PRPを、補正式PRP=α×PD+βにしたがって計算する補正部と、
を備えることを特徴とする制御回路。 - 前記パラメータ取得部は、複数の抵抗が外付け可能に構成され、接続される複数の抵抗それぞれの抵抗値に応じて、前記第1パラメータα、前記第2パラメータβを取得可能に構成されることを特徴とする請求項1に記載の制御回路。
- 前記パラメータ取得部は、
前記複数の抵抗の抵抗値を、複数の電圧に変換する電圧変換部と、
前記複数の電圧それぞれを複数のデジタル値に変換するA/Dコンバータと、
を含み、前記複数のデジタル値を、前記第1パラメータα、前記第2パラメータβとして取り込むことを特徴とする請求項2に記載の制御回路。 - 前記複数の抵抗は、抵抗ストリングを形成するように直列に接続され、
前記電圧変換部は、
前記複数の抵抗の端子と接続される複数の設定端子と、
前記抵抗ストリングに定電流を供給する電流源と、
を含み、
前記A/Dコンバータは、前記複数の設定端子の電圧および/または前記複数の設定端子の間の電位差をデジタル値に変換することを特徴とする請求項3に記載の制御回路。 - 前記パラメータ取得部は、
前記複数の抵抗が接続される複数の設定端子と、
前記複数の抵抗に対応付けて設けられ、それぞれが対応する抵抗の抵抗値に反比例する電流を生成する複数の電流変換部と、
前記複数の電流変換部に対応付けて設けられ、それぞれが対応する電流変換部が生成した電流を電圧に変換する電圧変換部と、
を含むことを特徴とする請求項2に記載の制御回路。 - 前記パラメータ取得部は、
前記第1パラメータα、前記第2パラメータβを含むシリアルデータを、外部のプロセッサから受信するインタフェース回路と、
前記第1パラメータα、前記第2パラメータβを格納するレジスタと、
を含むことを特徴とする請求項1に記載の制御回路。 - 前記受信電力演算部は、前記ワイヤレス受電装置の負荷に流れる電流ILOADを測定する負荷電流測定部を含み、所定の関数fD(ILOAD)にもとづいて、前記消費電力PDを計算することを特徴とする請求項1から6のいずれかに記載の制御回路。
- 前記ワイヤレス受電装置は、前記制御回路に加えて、
受信コイルと、
前記受信コイルに流れる電流を整流する整流回路と、
前記整流回路の出力と接続され、整流電圧VRECTを発生させる平滑コンデンサと、
を備え、
前記関数fD(ILOAD)は、(VRECT×ILOAD)の項を含むことを特徴とする請求項7に記載の制御回路。 - 前記関数fD(ILOAD)は、所定の定数をRONとしてRON×ILOAD2の項をさらに含むことを特徴とする請求項8に記載の制御回路。
- 前記制御回路は、
前記制御回路の動作電流IDDを測定する電源電流測定部と、
前記制御回路に供給される電源電圧VDDを測定する電圧測定部と、を含み、
前記関数fD(ILOAD)は、(VDD×IDD)の項をさらに含むことを特徴とする請求項8または9に記載の制御回路。 - 前記制御回路は、前記整流電圧VRECTを前記電源電圧VDDとして動作することを特徴とする請求項10に記載の制御回路。
- Qi規格に準拠したことを特徴とする請求項1から11のいずれかに記載の制御回路。
- ひとつの半導体基板に一体集積化されることを特徴とする請求項1から12のいずれかに記載の制御回路。
- 受信コイルと、
前記受信コイルに流れる電流を整流する整流回路と、
前記整流回路の出力と接続され、整流電圧VRECTを発生させる平滑コンデンサと、
請求項1から13のいずれかに記載の制御回路と、
を備えることを特徴とするワイヤレス受電装置。 - 受信コイルと、
前記受信コイルに流れる電流を整流する整流回路と、
前記整流回路の出力と接続され、整流電圧VRECTを発生させる平滑コンデンサと、
請求項1から13のいずれかに記載の制御回路と、
を備えることを特徴とする電子機器。 - ワイヤレス受電装置において受信電力を計算する方法であって、
前記ワイヤレス受電装置の消費電力PDを計算するステップと、
外部から、第1パラメータα、第2パラメータβを取得するステップと、
PRP=α×PD+βにもとづいて前記受信電力を計算するステップと、
を備えることを特徴とする方法。 - ワイヤレス受電装置の制御回路であって、
所定の経路に流れる電流Iを検出する電流検出部と、
前記ワイヤレス受電装置の消費電力PDを、前記電流Iを引数とする所定の関数fD(I)にもとづいて計算する受信電力演算部と、
前記電流Iの範囲がN個(Nは2以上の整数)の区間に分割されており、分割された区間ごとに指定されるパラメータα1~αNを外部から取得するパラメータ取得部と、
前記電流Iがi番目(1≦i≦N)の区間に含まれるとき、前記受信電力演算部により計算された前記消費電力PDを、パラメータαiを用いて補正することにより、前記ワイヤレス受電装置の受信電力PRPを計算する補正部と、
を備えることを特徴とする制御回路。 - j番目(1≦j≦N)のパラメータαjは、j番目の区間における電流Iに対する受信電力PRPjの傾きを補正するために使用されることを特徴とする請求項17に記載の制御回路。
- i番目の区間とi+1番目の区間のしきい値をIiとするとき、
前記補正部は、j番目の区間における受信電力PRPiを、
PRP1=α1×fD(I)
PRP2=α2×fD(I-I1)+α1×fD(I1)
PRP3=α3×fD(I-I2)+α2×fD(I2-I1)+α1×fD(I1)
・・・
にしたがって計算することを特徴とする請求項18に記載の制御回路。 - 前記パラメータ取得部は、前記パラメータα1~αNに加えて、パラメータβを外部から取得可能に構成され、
前記補正部は、前記受信電力PRPにパラメータβを加算することを特徴とする請求項17から19のいずれかに記載の制御回路。 - i番目の区間とi+1番目の区間のしきい値をIiとするとき、
前記パラメータ取得部はさらに、しきい値I1~IN-1を指定するパラメータを外部から取得可能に構成されることを特徴とする請求項17から20のいずれかに記載の制御回路。 - 前記パラメータ取得部は、
外部からのパラメータを含むシリアルデータを、外部のプロセッサから受信するインタフェース回路と、
受信したパラメータを格納するレジスタと、
を含むことを特徴とする請求項17から21のいずれかに記載の制御回路。 - 前記パラメータ取得部は、複数の抵抗が外付け可能に構成され、接続される複数の抵抗それぞれの抵抗値に応じて、前記パラメータα1~αNを取得可能に構成されることを特徴とする請求項17から21のいずれかに記載の制御回路。
- 前記電流検出部は、前記ワイヤレス受電装置の負荷に流れる電流ILOADを測定するよう構成され、
前記関数fD(I)は、電流ILOADを引数として定義されることを特徴とする請求項17から23のいずれかに記載の制御回路。 - 前記ワイヤレス受電装置は、前記制御回路に加えて、
受信コイルと、
前記受信コイルに流れる電流を整流する整流回路と、
前記整流回路の出力と接続され、整流電圧VRECTを発生させる平滑コンデンサと、
を備え、
前記関数fD(ILOAD)は、(VRECT×ILOAD)の項を含むことを特徴とする請求項24に記載の制御回路。 - 前記関数fD(ILOAD)は、所定の定数をRONとしてRON×ILOAD2の項をさらに含むことを特徴とする請求項25に記載の制御回路。
- 前記制御回路は、
前記制御回路の動作電流IDDを測定する電源電流測定部と、
前記制御回路に供給される電源電圧VDDを測定する電圧測定部と、を含み、
前記関数fD(ILOAD)は、(VDD×IDD)の項をさらに含むことを特徴とする請求項25または26に記載の制御回路。 - 前記制御回路は、前記整流電圧VRECTを前記電源電圧VDDとして動作することを特徴とする請求項27に記載の制御回路。
- Qi規格に準拠したことを特徴とする請求項17から28のいずれかに記載の制御回路。
- ひとつの半導体基板に一体集積化されることを特徴とする請求項17から29のいずれかに記載の制御回路。
- 受信コイルと、
前記受信コイルに流れる電流を整流する整流回路と、
前記整流回路の出力と接続され、整流電圧VRECTを発生させる平滑コンデンサと、
請求項17から30のいずれかに記載の制御回路と、
を備えることを特徴とするワイヤレス受電装置。 - 受信コイルと、
前記受信コイルに流れる電流を整流する整流回路と、
前記整流回路の出力と接続され、整流電圧VRECTを発生させる平滑コンデンサと、
請求項17から31のいずれかに記載の制御回路と、
を備えることを特徴とする電子機器。 - ワイヤレス受電装置において受信電力を計算する方法であって、
前記ワイヤレス受電装置の消費電力PDを、所定の経路に流れる電流Iを引数とする所定の関数fD(I)にもとづいて計算するステップと、
前記電流Iの範囲がN個(Nは2以上の整数)の区間に分割されており、分割された区間ごとに指定されるパラメータα1~αNを外部から取得するステップと、
前記電流Iがi番目の区間に含まれるとき、前記関数fD(I)を用いて計算された前記消費電力PDをパラメータαiを用いて補正することにより、前記ワイヤレス受電装置の受信電力を計算するステップと、
を備えることを特徴とする方法。 - ワイヤレス受電装置の制御回路であって、
所定の経路に流れる電流Iを検出する電流検出部と、
前記電流Iの範囲がN個(Nは2以上の整数)の区間に分割されており、分割された区間ごとに指定されるパラメータα1~αNを外部から取得するパラメータ取得部と、
i番目の区間における前記ワイヤレス受電装置の受信電力PDを、前記電流Iを引数とし、パラメータα1~αNを用いて定義される区間ごとに固有の関数にもとづいて計算する受信電力演算部と、
を備えることを特徴とする制御回路。
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