Primary-side power control for inductive power transfer
First Claim
1. A method of controlling an output voltage of a pickup in an inductive power transfer (IPT) system comprising the pickup, a power supply, and a primary conductive path, the method comprising steps of:
- deriving an estimate of the output voltage of the pickup from a real component of a voltage across the primary conductive path; and
adjusting a current in the primary conductive path so that the estimated pickup output voltage matches a required pickup output voltage, by controlling a voltage supplied to the primary conductive path by the power supply.
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Accused Products
Abstract
A method is provided for controlling the output voltage of a pickup in an inductive power transfer (IPT) system without any additional form of communications for feedback from the pickup to the power supply. The method comprising the steps of deriving an estimate of the output voltage of the pickup from the voltage across the primary conductive path, and adjusting the current in the primary conductive path so that the estimated pickup output voltage matches a required pickup output voltage. In particular, an estimate of the pickup output voltage is derived from the magnitude and phase angle of the voltage in the primary conductive path.
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Citations
14 Claims
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1. A method of controlling an output voltage of a pickup in an inductive power transfer (IPT) system comprising the pickup, a power supply, and a primary conductive path, the method comprising steps of:
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deriving an estimate of the output voltage of the pickup from a real component of a voltage across the primary conductive path; and adjusting a current in the primary conductive path so that the estimated pickup output voltage matches a required pickup output voltage, by controlling a voltage supplied to the primary conductive path by the power supply. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A power supply for inductive coupling with a pickup via a primary conductive path in an inductive power transfer (IPT) system, the power supply comprising:
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an inverter; a resonant tank electrically coupled with an output of the inverter and comprising a tuning capacitor and the primary conductive path; and a power controller adapted to deriving an estimate of an output voltage of the pickup from a real component of a voltage across the primary conductive path. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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Specification