Inductive power transfer control
First Claim
1. A control method for an inductive power transfer (IPT) pick-up, the IPT pick-up comprising a resonant circuit producing an AC input current, a rectifier and a DC output, wherein the AC input current is rectified to supply the DC output, the method comprising:
- predetermining a proportion of a period of the AC input current;
supplying the predetermined proportion of the AC input current is rectified to the DC output; and
recirculating a remaining proportion of the AC input current to the resonant circuit.
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Accused Products
Abstract
An inductive power transfer (IPT) control method is disclosed for controlling the output of an IPT pick-up. The invention involves selectively shunting first and second diodes of a diode bridge to selectively rectify an AC current input for supply to a load, or recirculate the AC current to a resonant circuit coupled to the input of the controller. By controlling the proportion of each positive-negative cycle of the AC input which is rectified/recirculated, the output is regulated. Also disclosed is an IPT controller adapted to perform the method, an IPT pick-up incorporating the IPT controller, and an IPT system incorporating at least one such IPT pick-up.
11 Citations
20 Claims
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1. A control method for an inductive power transfer (IPT) pick-up, the IPT pick-up comprising a resonant circuit producing an AC input current, a rectifier and a DC output, wherein the AC input current is rectified to supply the DC output, the method comprising:
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predetermining a proportion of a period of the AC input current; supplying the predetermined proportion of the AC input current is rectified to the DC output; and recirculating a remaining proportion of the AC input current to the resonant circuit. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. An inductive power transfer pick-up comprising:
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a resonant circuit for producing an AC input current; and a rectifier for rectifying the AC input current in order to supply a DC output, the rectifier arranged to supply a proportion of the AC input current to the DC output and to recirculate the remaining proportion of the AC input current to the resonant circuit. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20)
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Specification