Single phase power supply for inductively coupled power transfer systems
First Claim
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1. An inductively coupled power transfer (ICPT) system comprising:
- a conductive path;
a pick-up adapted to receive power from the conductive path;
a power supply to energize the conductive path, the power supply comprising a single phase input for receiving single phase electric power at a utility supply frequency and a converter to provide an alternating current at an operating frequency greater than the utility supply frequency in the conductive path and the converter modulating the amplitude of the alternating current with respect to the utility supply frequency such that the amplitude of the alternating current varies;
wherein the pick-up comprises an energy storage element adapted to provide a continuous supply of power to a load supplied thereby irrespective of the varying amplitude of the alternating current in the conductive path; and
wherein the power supply modulates the alternating current to vary in amplitude between substantially zero and a maximum value.
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Abstract
An ICPT system has a single phase power supply which energises a conductive path (13) and has an inverter (5) to provide an alternating current at an operating frequency greater than the single phase utility supply frequency in the conductive path. The inverter modulates the amplitude of the alternating current with respect to the utility supply frequency such that the amplitude of the alternating current varies. The pick-up has an energy storage element (26) to provide a continuous supply of power to a load (27) irrespective of the varying amplitude of the alternating current in the conductive path.
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Citations
28 Claims
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1. An inductively coupled power transfer (ICPT) system comprising:
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a conductive path; a pick-up adapted to receive power from the conductive path; a power supply to energize the conductive path, the power supply comprising a single phase input for receiving single phase electric power at a utility supply frequency and a converter to provide an alternating current at an operating frequency greater than the utility supply frequency in the conductive path and the converter modulating the amplitude of the alternating current with respect to the utility supply frequency such that the amplitude of the alternating current varies; wherein the pick-up comprises an energy storage element adapted to provide a continuous supply of power to a load supplied thereby irrespective of the varying amplitude of the alternating current in the conductive path; and wherein the power supply modulates the alternating current to vary in amplitude between substantially zero and a maximum value. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 26)
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13. A method of supplying power to a load using an inductively coupled power transfer (ICPT) system, the method comprising:
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energizing a conductive path to provide an alternating current of varying amplitude; using a pick-up to transfer power from the conductive path to an energy storage element associated with the pick-up; using the energy storage element to provide a continuous supply of power to a load supplied thereby irrespective of the varying amplitude of the alternating current in the conductive path; and modulating the alternating current to vary in amplitude between substantially zero and a maximum value. - View Dependent Claims (14, 15, 16, 17, 18, 19)
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20. An inductively coupled power transfer (ICPT) power supply comprising:
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a single phase input for receiving single phase electric power at a utility supply frequency; an output for connection to a conductive path of an ICPT system; a converter to provide an alternating current at a power transfer frequency greater than the utility supply frequency, and the converter modulating the amplitude of the alternating current with respect to the utility supply frequency such that the amplitude of the alternating current varies in amplitude between substantially zero and a maximum value; an inductive element and a capacitive element provided between the converter and the output; wherein in use the inductance of the inductive element, the capacitance of the capacitive element and the inductance of the conductive path provide an LCL filter. - View Dependent Claims (21, 22, 23, 24, 25)
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27. An inductively coupled power transfer (ICPT) power supply comprising:
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a single phase input for receiving single phase electric power at a utility supply frequency; a rectifier to rectify the single phase electric power; a converter coupled by a capacitor to the rectifier and arranged to provide an alternating current at an operating frequency greater than the utility supply frequency, wherein the capacitor is sufficiently small such that the alternating current is severely amplitude modulated with respect to the utility supply frequency. - View Dependent Claims (28)
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Specification