Systems and methods for bi-state impedance conversion in wireless power transfer
First Claim
1. A wireless power transmitter comprising:
- a transmit antenna configured to generate a field for wireless power transfer;
a first capacitor;
at least one switch configured to selectively connect the first capacitor in parallel with the transmit antenna in a first configuration and in series with the transmit antenna in a second configuration;
a second capacitor connected in parallel with the transmit antenna; and
a multi-tap transformer having a first turns-ratio and a second turns-ratio, the first turns-ratio being lower than the second turns-ratio,the at least one switch further configured to select the first turns-ratio for the transformer in the first configuration and select the second turns-ratio for the transformer in the second configuration.
2 Assignments
0 Petitions
Accused Products
Abstract
One aspect provides a wireless power transmitter. The wireless power transmitter includes a transmit antenna configured to generate a field for wireless transmit power in both a first and second configuration. The wireless power transmitter further includes a first capacitor. The wireless power transmitter further includes at least one switch configured to selectively connect the first capacitor in one of the first and second configuration, the first capacitor being in parallel with the transmit antenna in the first configuration and in series with the transmit antenna in the second configuration. The wireless power transmitter further includes a second capacitor in parallel with the transmit antenna and a transformer configured to operate at a first turns-ratio in the first configuration and a second turns-ratio in the second configuration, the first turns-ratio being lower than the second turns-ratio.
15 Citations
30 Claims
-
1. A wireless power transmitter comprising:
-
a transmit antenna configured to generate a field for wireless power transfer; a first capacitor; at least one switch configured to selectively connect the first capacitor in parallel with the transmit antenna in a first configuration and in series with the transmit antenna in a second configuration; a second capacitor connected in parallel with the transmit antenna; and a multi-tap transformer having a first turns-ratio and a second turns-ratio, the first turns-ratio being lower than the second turns-ratio, the at least one switch further configured to select the first turns-ratio for the transformer in the first configuration and select the second turns-ratio for the transformer in the second configuration. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
-
-
9. A method of transmitting wireless charging power in a wireless power transmitter, comprising:
-
generating, at a transmit antenna, a field for wireless power transfer; selectively connecting a first capacitor, via at least one switch, in parallel with the transmit antenna in a first configuration and in series with the transmit antenna in a second configuration, the transmit antenna connected in parallel with a second capacitor; selectively configuring a multi-tap transformer having a first turns-ratio and a second turns-ratio, the first turns-ratio being higher than the second turns-ratio, to operate with the first turns-ratio in the first configuration and to operate with the second turns-ratio in the second configuration via the at least one switch. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
-
-
17. An apparatus for transmitting wireless charging power, comprising:
-
a first capacitor; means for generating a field for wireless power transfer; a second capacitor in parallel with the means for generating the field; means for selectively connecting the first capacitor in parallel with the means for generating in a first configuration and in series with the means for generating in a second configuration; and means for isolating having a first turns-ratio and a second turns-ratio, the first turns-ratio being higher than the second turns-ratio, the means for selectively connecting configured to select the first turns-ratio for the means for isolating in the first configuration and select the second turns-ratio for the means for isolating in the second configuration. - View Dependent Claims (18, 19, 20, 21, 22, 23)
-
-
24. A non-transitory computer-readable medium comprising code that, when executed, causes an apparatus to:
-
generate, at a transmit antenna, a field for wireless power transfer; selectively connect, via at least one switch, a first capacitor in parallel with the transmit antenna in a first configuration and in series with the transmit antenna in a second configuration, wherein the apparatus comprises a second capacitor in parallel with the transmit antenna; and selectively configure, via the at least one switch, a multi-tap transformer having a first turns-ratio and a second turns-ratio, the first turns-ratio being higher than the second turns-ratio, to operate with the first turns-ratio in the first configuration and to operate with the second turns-ratio in the second configuration. - View Dependent Claims (25, 26, 27, 28, 29, 30)
-
Specification