Wireless power systems having interleaved rectifiers
First Claim
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1. A wireless power receiver comprising:
- a receiver resonator coupled to an impedance matching network, the impedance matching network having a first node and a second node;
coupled to the first node, a first branch having a first positive reactance and a second branch having a first negative reactance;
coupled to the second node, a third branch having a second positive reactance and a fourth branch having a second negative reactance;
a first rectifier having a first rectifier input coupled to the first branch;
a second rectifier having a second rectifier input coupled to the second branch;
a third rectifier having a third rectifier input coupled to the third branch; and
a fourth rectifier having a fourth rectifier input coupled to the fourth branch,such that, during reception of electromagnetic energy by the wireless power receiver;
a first current is formed in the first branch and a second current is formed in the second branch, wherein a magnitude of the first current is within 30% of a magnitude of the second current, anda third current is formed in the third branch and a fourth current is formed in the fourth branch, wherein a magnitude of the third current is within 30% of a magnitude of the fourth current, the currents oscillating at a fundamental frequency f0 and at least one harmonic frequency fh of the fundamental frequency f0,wherein the absolute value of the first negative reactance is at least 4% different than the absolute value of the first positive reactance and the absolute value of the second negative reactance is at least 4% different than the absolute value of the second positive reactance.
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Abstract
A wireless power receiver is coupled to an impedance matching network, the impedance matching network having a first node and a second node. Coupled to the first node is a first branch having a first positive reactance and a second branch having a first negative reactance, wherein an absolute value of the first positive reactance is different from an absolute value of the first negative reactance, and coupled to the second node is a third branch having a second positive reactance and a fourth branch having a second negative reactance, wherein an absolute value of the second positive reactance is different from an absolute value of the second negative reactance.
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Citations
20 Claims
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1. A wireless power receiver comprising:
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a receiver resonator coupled to an impedance matching network, the impedance matching network having a first node and a second node; coupled to the first node, a first branch having a first positive reactance and a second branch having a first negative reactance; coupled to the second node, a third branch having a second positive reactance and a fourth branch having a second negative reactance; a first rectifier having a first rectifier input coupled to the first branch; a second rectifier having a second rectifier input coupled to the second branch; a third rectifier having a third rectifier input coupled to the third branch; and a fourth rectifier having a fourth rectifier input coupled to the fourth branch, such that, during reception of electromagnetic energy by the wireless power receiver; a first current is formed in the first branch and a second current is formed in the second branch, wherein a magnitude of the first current is within 30% of a magnitude of the second current, and a third current is formed in the third branch and a fourth current is formed in the fourth branch, wherein a magnitude of the third current is within 30% of a magnitude of the fourth current, the currents oscillating at a fundamental frequency f0 and at least one harmonic frequency fh of the fundamental frequency f0, wherein the absolute value of the first negative reactance is at least 4% different than the absolute value of the first positive reactance and the absolute value of the second negative reactance is at least 4% different than the absolute value of the second positive reactance. - View Dependent Claims (2)
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3. A wireless power receiver comprising:
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a receiver resonator coupled to an impedance matching network, the impedance matching network having a first node and a second node; coupled to the first node, a first branch having a first positive reactance and a second branch having a first negative reactance; coupled to the second node, a third branch having a second positive reactance and a fourth branch having a second negative reactance; a first rectifier having a first rectifier input coupled to the first branch; a second rectifier having a second rectifier input coupled to the second branch; a third rectifier having a third rectifier input coupled to the third branch; and a fourth rectifier having a fourth rectifier input coupled to the fourth branch, such that, during reception of electromagnetic energy by the wireless power receiver; a first current is formed in the first branch and a second current is formed in the second branch, wherein a magnitude of the first current is within 30% of a magnitude of the second current, and a third current is formed in the third branch and a fourth current is formed in the fourth branch, wherein a magnitude of the third current is within 30% of a magnitude of the fourth current, the currents oscillating at a fundamental frequency f0 and at least one harmonic frequency fh of the fundamental frequency f0, wherein; the receiver is configured to deliver power to a battery with a voltage range Vlow to Vhigh, the battery coupled to an output of the first, second, third, and fourth rectifiers, and for voltages Vlow to 0.5(Vlow+Vhigh), (i) the magnitude of the first current is within 30% of the magnitude of the second current and (ii) the magnitude of the third current is within 30% of the magnitude of the fourth current. - View Dependent Claims (4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A wireless power receiver comprising:
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a receiver resonator coupled to an impedance matching network, the impedance matching network having a first node and a second node; coupled to the first node, a first branch having a first positive reactance and a second branch having a first negative reactance; coupled to the second node, a third branch having a second positive reactance and a fourth branch having a second negative reactance; a first rectifier having a first rectifier input coupled to the first branch; a second rectifier having a second rectifier input coupled to the second branch; a third rectifier having a third rectifier input coupled to the third branch; and a fourth rectifier having a fourth rectifier input coupled to the fourth branch, such that, during reception of electromagnetic energy by the wireless power receiver; a first current is formed in the first branch and a second current is formed in the second branch, wherein a magnitude of the first current is within 30% of a magnitude of the second current, and a third current is formed in the third branch and a fourth current is formed in the fourth branch, wherein a magnitude of the third current is within 30% of a magnitude of the fourth current, the currents oscillating at a fundamental frequency f0 and at least one harmonic frequency fh of the fundamental frequency f0, wherein the first branch and the third branch each comprise a first inductor and a first capacitor, an absolute value of a reactance value of the first inductor being greater than an absolute value of a reactance value of the first capacitor. - View Dependent Claims (14, 15)
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16. A vehicle charging system comprising:
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a wireless power receiver comprising; a receiver resonator coupled to an impedance matching network, the impedance matching network having a first node and a second node; coupled to the first node, a first branch having a first positive reactance and a second branch having a first negative reactance; coupled to the second node, a third branch having a second positive reactance and a fourth branch having a second negative reactance; a first rectifier having a first rectifier input coupled to the first branch; a second rectifier having a second rectifier input coupled to the second branch; a third rectifier having a third rectifier input coupled to the third branch; and a fourth rectifier having a fourth rectifier input coupled to the fourth branch, such that, during reception of electromagnetic energy by the wireless power receiver; a first current is formed in the first branch and a second current is formed in the second branch, wherein a magnitude of the first current is within 30% of a magnitude of the second current, and a third current is formed in the third branch and a fourth current is formed in the fourth branch, wherein a magnitude of the third current is within 30% of a magnitude of the fourth current, the currents oscillating at a fundamental frequency f0 and at least one harmonic frequency fh of the fundamental frequency f0; and a vehicle battery coupled to a first output node and a second output node, the first output node formed from an output of the first rectifier and an output of the third rectifier and the second output node formed from an output of the second rectifier and an output of the fourth rectifier. - View Dependent Claims (17, 18, 19)
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20. A wireless power receiver comprising:
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a receiver resonator coupled to an impedance matching network, the impedance matching network having a first node and a second node; coupled to the first node, a first branch having a first positive reactance and a second branch having a first negative reactance; coupled to the second node, a third branch having a second positive reactance and a fourth branch having a second negative reactance; a first rectifier having a first rectifier input coupled to the first branch; a second rectifier having a second rectifier input coupled to the second branch; a third rectifier having a third rectifier input coupled to the third branch; and a fourth rectifier having a fourth rectifier input coupled to the fourth branch, such that, during reception of electromagnetic energy by the wireless power receiver; a first current is formed in the first branch and a second current is formed in the second branch, wherein a magnitude of the first current is within 30% of a magnitude of the second current, and a third current is formed in the third branch and a fourth current is formed in the fourth branch, wherein a magnitude of the third current is within 30% of a magnitude of the fourth current, the currents oscillating at a fundamental frequency f0 and at least one harmonic frequency fh of the fundamental frequency f0, wherein a first difference between (a) an absolute value of the first positive reactance and (b) an absolute value of the first negative reactance is approximately equal to a second difference between (i) an absolute value of the second positive reactance and (ii) an absolute value of the second negative reactance.
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Specification