High efficiency voltage mode class D topology
First Claim
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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 non-resonant tank circuit connected between the switch node and the ground connection or supply connection or both, the tank circuit having an inductor with an inductance that absorbs an output capacitance of the pair of transistors, and a capacitor connected in series with the inductor and ground, the capacitor having a capacitance to provide DC blocking, wherein the tank circuit enables the power amplifier to operate as a no load buck converter with zero voltage switching; and
a resonant tuning circuit connected in series between the switch node and a load coupled to the power amplifier;
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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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.
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Citations
15 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 non-resonant tank circuit connected between the switch node and the ground connection or supply connection or both, the tank circuit having an inductor with an inductance that absorbs an output capacitance of the pair of transistors, and a capacitor connected in series with the inductor and ground, the capacitor having a capacitance to provide DC blocking, wherein the tank circuit enables the power amplifier to operate as a no load buck converter with zero voltage switching; and a resonant tuning circuit connected in series between the switch node and a load coupled to the power amplifier; 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. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. 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 non-resonant tank circuit connected between the switch node and the ground connection, the tank circuit having an inductor with an inductance that absorbs an output capacitance of the pair of transistors, and a capacitor connected in series with the inductor and the ground connection, the capacitor having a capacitance to provide DC blocking, wherein the tank circuit enables the power amplifier to operate as a no load buck converter with zero-voltage switching, and wherein the power transmitting device is configured to self-commutate the switch-node with a necessary dead-time between gate signals applied to the pair of transistors; 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 (9, 10, 11, 12, 13, 14, 15)
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Specification