Methods for parameter identification, load monitoring and output power control in wireless power transfer systems
First Claim
1. A method for identifying impedance related parameters in a wireless power transfer (WPT) system including n coils for maximizing an overall WPT system efficiency, the method comprising:
- providing a wireless power transfer (WPT) system comprising;
an n number of coils arranged sequentially,wherein a first coil of the n number of coils is a transmitting coil;
at least one capacitor connected to an i-th coil of the n number of coils;
a power source configured to be electrically connected to the first coil of the n number of coils and configured to drive a current through the first coil of the n number of coils;
a plurality of sensors configured to be electrically connected to the first coil of the n number of coils; and
a non-transitory computer readable medium configured to receive a signal from a sensor of the plurality of sensors and comprising stored instructions that when executed cause at least one processor to;
sense, by the sensor of the plurality of sensors, input impedances of the WPT system at different respective frequencies fk,(k=1, 2, . . . m);
express the measured input impedances at the different respective frequencies as a following first matrix equation;
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Abstract
A method for identifying impedance related parameters in a wireless power transfer (WPT) system including n coils is disclosed. Said method includes determining optimum values of the impedance related parameters based on a set of measured input impedance by applying an evolutionary algorithm to solve optimum solutions. Wherein the set of measured input impedance includes an input impedance vector {right arrow over (Z)}=(Z1, Z2, . . . , Zm−1, Zm), each input impedance in the vector (Zk) measured at different frequencies fk, (k=1, 2, . . . m); and the impedance related parameters includes dll−1 representing a distance between the l-th coil and the l+1 coil (l=1, 2, . . . n−1) and Ci representing a capacitance of the capacitor connected to the i-th coil (i=1, 2, . . . n).
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Citations
19 Claims
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1. A method for identifying impedance related parameters in a wireless power transfer (WPT) system including n coils for maximizing an overall WPT system efficiency, the method comprising:
providing a wireless power transfer (WPT) system comprising; an n number of coils arranged sequentially, wherein a first coil of the n number of coils is a transmitting coil; at least one capacitor connected to an i-th coil of the n number of coils; a power source configured to be electrically connected to the first coil of the n number of coils and configured to drive a current through the first coil of the n number of coils; a plurality of sensors configured to be electrically connected to the first coil of the n number of coils; and a non-transitory computer readable medium configured to receive a signal from a sensor of the plurality of sensors and comprising stored instructions that when executed cause at least one processor to; sense, by the sensor of the plurality of sensors, input impedances of the WPT system at different respective frequencies fk,(k=1, 2, . . . m); express the measured input impedances at the different respective frequencies as a following first matrix equation; - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method for controlling output power in a wireless power transfer (WPT) system including n coils for maximizing an overall WPT system efficiency, the method comprising:
providing a wireless power transfer (WPT) system comprising; an n number of coils arranged sequentially, wherein a first coil of the n number of coils is a transmitting coil; at least one capacitor connected to an i-th coil of the n number of coils; a power source configured to be electrically connected to the first coil of the n number of coils and configured to drive a current through the first coil of the n number of coils; a plurality of sensors configured to be electrically connected to the first coil of the n number of coils; and a non-transitory computer readable medium configured to receive a signal from the a sensor of the plurality of sensors and comprising stored instructions that when executed cause at least one processor to; (a) sense, by the sensor of the plurality of sensors, an input voltage U1 and an input current I1 of the first coil of the n number of coils; (b) determine whether impedance related parameters in the WPT system are known, wherein the impedance related parameters include dll+1 representing a distance between an l-th coil and an l+1 coil (l=1, 2, . . . n−
1) and Ci representing a capacitance of the capacitor connected to the i-th coil (i=1, 2, . . . n);(b.1) if the impedance related parameters in the WPT are known, the method further comprises; based on the sensed input voltage U1, the sensed input current I1, and the known impedance related parameters, estimating a load ZLof the WPT system, an output current In of the WPT system, a power Pout of the load ZL, an output voltage Uo of the WPT system, and an efficiency η
of the WPT system in the following manner;calculate the load ZL, by the equation of - View Dependent Claims (14, 15, 16, 17, 18, 19)
Specification