HIGH EFFICIENCY VOLTAGE MODE CLASS D TOPOLOGY
First Claim
Patent Images
1. A power amplifier comprising:
- a pair of transistors connected in series between a voltage source and a ground connection;
a switch node disposed between a source of a first transistor of the pair of transistors and a drain of a second transistor of the pair of transistors;
a circuit connected between the switch node and the ground connection or supply connection or both, the circuit having an inductor with an inductance that absorbs an output capacitance of the pair of transistors; and
a resonant tuning circuit connected in series between the switch node and a load coupled to the power amplifier.
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Abstract
A high efficiency voltage mode class D amplifier and energy transfer system is provided. The amplifier and system includes a pair of transistors connected in series between a voltage source and a ground connection. Further, a ramp current tank circuit is coupled in parallel with one of the pair of transistors and a resonant tuned load circuit is coupled to the ramp current tank circuit. The ramp current tank circuit can include an inductor that absorbs an output capacitance COSS of the pair of transistors and a capacitor the provides DC blocking.
15 Citations
30 Claims
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1. A power amplifier comprising:
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a pair of transistors connected in series between a voltage source and a ground connection; a switch node disposed between a source of a first transistor of the pair of transistors and a drain of a second transistor of the pair of transistors; a circuit connected between the switch node and the ground connection or supply connection or both, the circuit having an inductor with an inductance that absorbs an output capacitance of the pair of transistors; and a resonant tuning circuit connected in series between the switch node and a load coupled to the power amplifier. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A wireless energy transfer system comprising:
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a power transmitting device including; a pair of transistors connected in series between a voltage source and a ground connection; a switch node disposed between a source of a first of the pair of transistors and a drain of a second of the pair of transistors; a circuit connected between the switch node and the ground connection, the circuit having an inductor with an inductance that absorbs an output capacitance of the pair of transistors; and a capacitor and series connected coil coupled in parallel to the tank circuit between the switch node and the ground connection; and a power receiving device including; a load; a rectifier connected in parallel to the load; a pair of capacitors coupled to the rectifier; and a receiving coil coupled in parallel to at least one of the pair of capacitors. - View Dependent Claims (13, 14, 15, 16, 18, 19, 20, 21, 22, 23)
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17. The wireless energy transfer system 16, wherein the power amplifier is configured to self-commutate the switch-node with a necessary dead-time between gate signals applied to the pair of transistors.
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24. A power amplifier comprising:
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a first pair of transistors connected in series between a voltage source and a ground connection; a second pair of transistors connected in series between a voltage source and a ground connection; a first switch node disposed between a source of a first transistor of the first pair of transistors and a drain of a second transistor of the first pair of transistors; a second switch node disposed between a source of a first transistor of the second pair of transistors and a drain of a second transistor of the second pair of transistors; a first inductor connected between the first switch node and the second switch node; and a capacitor connected to a load in series and coupled to either the first or the second switch nodes. - View Dependent Claims (25, 26, 27, 28, 29, 30)
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Specification