Wireless power charger for vehicle
AssigneeZoox, Inc.
InventorVamsi Krishna Pathipati
Life of this patent
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Abstract
Techniques for converting power received from a power grid at a first voltage and outputting a signal at a second voltage are discussed herein. A power converter with a transformer that has a 22.5 degrees phase shift between current output by corresponding pairs of secondary windings can be utilized to convert power of a first level to power of a second level. The transformer can output power from 30 secondary windings. The power converter can output power with a total harmonic distortion of 5% and an efficiency of 96% or higher. Further, power can be output by a transmission coil and received by a receive coil in a device, such as a vehicle, to wirelessly charge the vehicle.
Claims20
A system comprising:
- a transformer configured to receive power from a power grid at a first voltage and to output alternating current (AC) power at a second voltage;
- a rectifier circuit directly coupled to the transformer, the rectifier circuit configured to receive the AC power and to output direct circuit (DC) power;
- and
- a power inverter, the power inverter including a transmission coil configured to receive the DC power and wirelessly transfer power to a receive coil in a vehicle,
- wherein a phase shift between a first current output by a first winding in a pair of windings that outputs the AC power at the second voltage and a second current output by a second winding in the pair of windings that outputs the AC power at the second voltage is less than or equal to 27.5 degrees.
A method comprising:
- receiving, by a transformer, power from a power grid at a first voltage;
- outputting, by the transformer, alternating current (AC) power at a second voltage,
- wherein a phase shift between a first current output by a first winding in a pair of windings that outputs the AC power at the second voltage and a second current output by a second winding in the pair of windings that outputs the AC power at the second voltage is less than or equal to 22.5 degrees;
- receiving, by a rectifier circuit directly coupled to the transformer, the AC power;
- outputting, by the rectifier circuit, direct circuit (DC) power;
- receiving, by a power inverter, the DC power;
- and
- transferring, by a transmission coil that is associated with the power inverter, power to a receive coil in a vehicle.
A system comprising:
- a transformer configured to receive power from a power grid at a first voltage and to output alternating current (AC) electrical power at a second voltage,
- wherein a phase shift between a first current output by a first winding in a pair of windings that outputs the AC electrical power at the second voltage and a second current output by a second winding in the pair of windings that outputs the AC electrical power is less than or equal to 22.5 degrees;
- a rectifier circuit coupled to the transformer, the rectifier circuit configured to receive the AC electrical power and to output direct circuit (DC) electrical power;
- and
- a power inverter including a transmission coil that is configured to receive the DC electrical power and wirelessly transfer power to a receive coil in a vehicle.
Dependencies are inferred from the claim text.