Inductive power transfer control
First Claim
1. A control method for an inductive power transfer (IPT) pick-up, the pick-up comprising a resonant circuit producing an AC input current, a rectifier circuit comprising a first switch operable to shunt a first diode of a diode bridge and a second switch operable to shunt a second diode of the diode bridge, and a DC output, wherein the AC input current is rectified to supply the DC output, the method comprising:
- selectively operating the switches to shunt first and second diodes of the diode bridge in synchrony with the AC current to provide the DC output.
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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.
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Citations
18 Claims
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1. A control method for an inductive power transfer (IPT) pick-up, the pick-up comprising a resonant circuit producing an AC input current, a rectifier circuit comprising a first switch operable to shunt a first diode of a diode bridge and a second switch operable to shunt a second diode of the diode bridge, and a DC output, wherein the AC input current is rectified to supply the DC output, the method comprising:
selectively operating the switches to shunt first and second diodes of the diode bridge in synchrony with the AC current to provide the DC output. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. An inductive power transfer (IPT) pick-up controller comprising:
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an input for receiving an AC current from a resonant circuit; an output for supplying a DC current to a load; and a control circuit electrically coupling the input and the output, the control circuit comprising a diode bridge, shunting switches, and a controller for selectively operating said switches to shunt first and second diodes of said diode bridge in synchrony with the AC current. - View Dependent Claims (13, 14, 15, 16, 17, 18)
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Specification