Load control for bi-directional inductive power transfer systems
First Claim
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1. A control method for use in a primary side power converter of an inductive power transfer (IPT) system having a controller, the method comprising:
- determining a power-frequency characteristic for the primary side power converter;
determining power available for supply by the primary side power converter; and
controlling, using the controller, an operating frequency in accordance with the power-frequency characteristic dependent on the determined power available, wherein the controlling of the operating frequency comprises intermittently varying the operating frequency;
monitoring, using the controller, a power transfer.
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Abstract
A control method for use in a primary side power converter (1) of an inductive power transfer (IPT) system. The power transfer from the primary side to one or more secondary pick-ups is monitored, and the operating frequency of the primary side power converter (1) is varied in proportion to a difference between the monitored power transfer and a power capability of the primary side power converter. The frequency variation can be sensed by the or each pick-up (2) to regulate the power transfer and to prevent overloading from occurring.
6 Citations
22 Claims
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1. A control method for use in a primary side power converter of an inductive power transfer (IPT) system having a controller, the method comprising:
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determining a power-frequency characteristic for the primary side power converter; determining power available for supply by the primary side power converter; and controlling, using the controller, an operating frequency in accordance with the power-frequency characteristic dependent on the determined power available, wherein the controlling of the operating frequency comprises intermittently varying the operating frequency; monitoring, using the controller, a power transfer. - View Dependent Claims (2, 3, 4)
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5. A control method for use in a primary side power converter of an inductive power transfer (IPT) system, the method comprising:
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determining a power-frequency characteristic for the primary side power converter; determining power available for supply by the primary side power converter; and controlling an operating frequency in accordance with the power-frequency characteristic dependent on the determined power available; wherein the controlling of the operating frequency comprises periodically varying the operating frequency. - View Dependent Claims (6, 7, 8)
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9. An inductive power transfer primary side power converter comprising:
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a sensor configured to determine power available for supply by the converter; and a controller configured to control an operating frequency in accordance with a power-frequency characteristic of the converter dependent on the determined power available; wherein the controller is configured to intermittently vary the operating frequency, and wherein the controller is configured to monitor a power transfer. - View Dependent Claims (10, 11, 12)
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13. An inductive power transfer primary side power converter comprising:
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a sensor configured to determine power available for supply by the converter; and a controller configured to control an operating frequency in accordance with a power-frequency characteristic of the converter dependent on the determined power available; wherein the controller is configured to periodically vary the operating frequency. - View Dependent Claims (14, 15, 16)
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17. An inductive power transfer primary side power converter comprising:
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a sensor configured to determine power available for supply by the converter; and a controller configured to control an operating frequency in accordance with a power-frequency characteristic of the converter dependent on the determined power available; wherein the controller is configured to monitor a power transfer. - View Dependent Claims (18, 19)
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20. A control method for use in a primary side power converter of an inductive power transfer (IPT) system having a controller, the method comprising:
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determining a power-frequency characteristic for the primary side power converter; determining power available for supply by the primary side power converter; controlling, using the controller, an operating frequency in accordance with the power-frequency characteristic dependent on the determined power available; and monitoring, using the controller, a power transfer. - View Dependent Claims (21, 22)
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Specification