High power RF field effect transistor switching using DC biases
First Claim
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1. An apparatus for providing tuning in a wireless power transfer system, comprising:
- a tuning element;
a field effect transistor having a gate, a first terminal contact, and a second terminal contact, said first terminal contact is at an alternating current (AC) voltage, the field effect transistor configured to electrically engage the tuning element to an AC power path based on a change in an electrical characteristic of the gate with respect to an electrical characteristic of the first terminal contact; and
a first capacitor coupled to the first terminal contact and a second capacitor coupled to the second terminal contact.
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Abstract
Systems, methods, and apparatus are provided for tuning in wireless power transfer circuits. One aspect of the disclosure provides an apparatus for tuning. The apparatus includes a field effect transistor having a gate, source, and drain, where the field effect transistor is configured to electrically engage a tuning element to an AC power path. In some embodiments, one of the source or drain contacts is at an alternating current voltage.
25 Citations
36 Claims
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1. An apparatus for providing tuning in a wireless power transfer system, comprising:
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a tuning element; a field effect transistor having a gate, a first terminal contact, and a second terminal contact, said first terminal contact is at an alternating current (AC) voltage, the field effect transistor configured to electrically engage the tuning element to an AC power path based on a change in an electrical characteristic of the gate with respect to an electrical characteristic of the first terminal contact; and a first capacitor coupled to the first terminal contact and a second capacitor coupled to the second terminal contact. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method of wireless transmitting power, the method comprising:
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providing a tuning element; providing a field effect transistor having a gate, a first terminal contact, a second terminal contact, said first terminal contact being at an alternating current (AC) voltage, and a first capacitor coupled to the first terminal contact and a second capacitor coupled to the second terminal contact; and electrically engaging the tuning element to an AC power path based on changing an electrical characteristic of the gate with respect to an electrical characteristic of the first terminal contact of the field effect transistor. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24)
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25. A tuning circuit, configured to provide tuning in a wireless power transfer system, the tuning circuit comprising:
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means for tuning; means for switching, said means for switching comprising a field effect transistor having a gate, a first terminal contact, and a second terminal contact, said first terminal contact being at an alternating current (AC) voltage; means for electrically engaging the tuning element to an AC power path based on changing an electrical characteristic of the gate with respect to an electrical characteristic of the first terminal contact of the field effect transistor; first means for providing capacitance to the means for switching at a first terminal contact of the means for switching; and second means for providing capacitance to the means for switching at a second terminal contact of the means for switching. - View Dependent Claims (26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36)
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Specification