DOUBLE-SIDED LCC COMPENSATION METHOD FOR WIRELESS POWER TRANSFER
First Claim
Patent Images
1. A wireless power transfer system, comprising:
- a send unit configured to transfer power using inductive power transfer, wherein the send unit includes;
an inverter configured to receive a DC input signal and convert the DC input signal to an AC output signal at a desired resonant frequency;
a send coil configured to receive the AC output signal from the inverter and generate an alternating electromagnetic field; and
a send side compensation circuit interconnecting the inverter with the send coil, wherein the compensation circuit is comprised of a send side inductor and a send side series capacitor serially coupled together at a node and to a positive terminal of the send coil, and a send side parallel capacitor coupled at the node and in parallel with the send coil; and
a receive unit configured to receive power via inductive power transfer from the send coil of the send unit, wherein the receive unit includesa receive coil configured to receive the alternating electromagnetic field from the send coil of the send unit and output an AC charging signal;
a receive side converter configured to receive the AC charging signal from the receive coil and convert the AC charging signal to a DC charging signal; and
a receive side compensation circuit interconnecting the receive coil with the receive side converter, wherein the receive side compensation circuit is comprised of a receive side inductor and a receive side series capacitor serially coupled together at a node and to a positive terminal of the receive coil, and a receive side parallel capacitor coupled at the node and in parallel with the receive coil.
1 Assignment
0 Petitions
Accused Products
Abstract
A double-sided LCC compensation network and a tuning method are proposed for a wireless power transfer system. With the proposed topology, the resonant frequency is independent of coupling coefficient and load conditions. The parameter values are tuned to realize zero voltage switching (ZVS) for the sending side switches. A wireless charging system with up to 7.7 kW output power was designed and built using the proposed topology and achieved 96% efficiency from DC power source to battery load.
-
Citations
19 Claims
-
1. A wireless power transfer system, comprising:
-
a send unit configured to transfer power using inductive power transfer, wherein the send unit includes; an inverter configured to receive a DC input signal and convert the DC input signal to an AC output signal at a desired resonant frequency; a send coil configured to receive the AC output signal from the inverter and generate an alternating electromagnetic field; and a send side compensation circuit interconnecting the inverter with the send coil, wherein the compensation circuit is comprised of a send side inductor and a send side series capacitor serially coupled together at a node and to a positive terminal of the send coil, and a send side parallel capacitor coupled at the node and in parallel with the send coil; and a receive unit configured to receive power via inductive power transfer from the send coil of the send unit, wherein the receive unit includes a receive coil configured to receive the alternating electromagnetic field from the send coil of the send unit and output an AC charging signal; a receive side converter configured to receive the AC charging signal from the receive coil and convert the AC charging signal to a DC charging signal; and a receive side compensation circuit interconnecting the receive coil with the receive side converter, wherein the receive side compensation circuit is comprised of a receive side inductor and a receive side series capacitor serially coupled together at a node and to a positive terminal of the receive coil, and a receive side parallel capacitor coupled at the node and in parallel with the receive coil. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
-
7. The wireless power transfer system of claim 6 wherein Δ
- L2 is computed in accordance with
-
8. The wireless power transfer system of claim 1 wherein the receive side converter is further defined as a full wave rectifier circuit.
-
9. The wireless power transfer system of claim 8 further comprises a battery configured to receive the DC charging signal from the receive side converter.
-
10. The wireless power transfer system of claim 9 wherein the receive unit is integrated into a vehicle.
-
11. The wireless power transfer system of claim 1 wherein the send side inductor and the send coil share a ferrite coil and the receive side inductor and the receive coil share a ferrite coil.
-
-
12. A wireless power transfer system, comprising:
-
a send unit configured to transfer power using inductive power transfer, wherein the send unit includes; a full bridge inverter circuit having four switches, the full bridge inverter circuit configured to receive the DC input signal and convert the DC input signal to an AC output signal at a desired resonant frequency; a controller electrically coupled to each of the four switches and drives the switches on and off at a zero voltage switching condition; a send coil configured to receive the AC output signal from the inverter circuit and generate an alternating electromagnetic field; and a send side compensation circuit interconnecting the inverter circuit with the send coil, wherein the compensation circuit is comprised of a send side inductor and a send side series capacitor serially coupled together at a node and to a positive terminal of the send coil, and a send side parallel capacitor coupled at the node and in parallel with the send coil; a receive unit configured to receive power via inductive power transfer from the send coil of the charging unit, wherein the receive unit includes a receive coil configured to receive the alternating electromagnetic field from the send coil of the send unit and output an AC charging signal; a receive side converter configured to receive the AC charging signal from the receive coil and convert the AC charging signal to a DC charging signal; and a receive side compensation circuit interconnecting the receive coil with the receive side converter, wherein the receive side compensation circuit is comprised of a receive side inductor and a receive side series capacitor serially coupled together at a node and to a positive terminal of the receive coil, and a receive side parallel capacitor coupled at the node and in parallel with the receive coil. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19)
-
Specification