Dual side control for inductive power transfer
First Claim
1. An apparatus comprising:
- a measurement module that measures a voltage and a current of an inductive power transfer (“
IPT”
) system, the voltage comprising one or more of an output voltage and an input voltage, the current comprising one or more of an output current and an input current, the output voltage and the output current measured at an output of the IPT system, the input voltage and the input current measured at an input of the IPT system;
a max efficiency module that determines, using the voltage and current measured by the measurement module, a maximum efficiency for the IPT system, the max efficiency module using one or more models of elements of the IPT system and varying parameters of the IPT system within the one or more models of the IPT system to iterate to a maximum efficiency; and
an adjustment module that adjusts one or more parameters in the IPT system consistent with the maximum efficiency calculated by the max efficiency module,wherein the IPT system includes a first stage and a second stage, wherein the first stage transmits energy wirelessly and the second stage receives the wirelessly transferred energy and controls energy transfer to one or more loads via an output bus,wherein the output voltage and the output current are measured on the output bus, wherein the one or more parameters varied by the max efficiency module and adjusted by the adjustment module comprise one or more of a duty cycle reference that adjusts a duty cycle of a switching power converter of the second stage and a conduction angle reference that adjusts conduction angle of a switching power converter of the first stage, wherein one parameter is used as the primary control variable and another parameter is updated to regulate output power.
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Abstract
An apparatus for dual side control includes a measurement module that measures a voltage and a current of an IPT system. The voltage includes an output voltage and/or an input voltage and the current includes an output current and/or an input current. The output voltage and the output current are measured at an output of the IPT system and the input voltage and the input current measured at an input of the IPT system. The apparatus includes a max efficiency module that determines a maximum efficiency for the IPT system. The max efficiency module uses parameters of the IPT system to iterate to a maximum efficiency. The apparatus includes an adjustment module that adjusts one or more parameters in the IPT system consistent with the maximum efficiency calculated by the max efficiency module.
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Citations
23 Claims
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1. An apparatus comprising:
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a measurement module that measures a voltage and a current of an inductive power transfer (“
IPT”
) system, the voltage comprising one or more of an output voltage and an input voltage, the current comprising one or more of an output current and an input current, the output voltage and the output current measured at an output of the IPT system, the input voltage and the input current measured at an input of the IPT system;a max efficiency module that determines, using the voltage and current measured by the measurement module, a maximum efficiency for the IPT system, the max efficiency module using one or more models of elements of the IPT system and varying parameters of the IPT system within the one or more models of the IPT system to iterate to a maximum efficiency; and
an adjustment module that adjusts one or more parameters in the IPT system consistent with the maximum efficiency calculated by the max efficiency module,wherein the IPT system includes a first stage and a second stage, wherein the first stage transmits energy wirelessly and the second stage receives the wirelessly transferred energy and controls energy transfer to one or more loads via an output bus, wherein the output voltage and the output current are measured on the output bus, wherein the one or more parameters varied by the max efficiency module and adjusted by the adjustment module comprise one or more of a duty cycle reference that adjusts a duty cycle of a switching power converter of the second stage and a conduction angle reference that adjusts conduction angle of a switching power converter of the first stage, wherein one parameter is used as the primary control variable and another parameter is updated to regulate output power. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A system comprising:
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a first stage comprising a primary receiver pad; a second stage comprising a secondary receiver pad; an output power bus, wherein the first stage transmits energy wirelessly from the primary receiver pad and the second stage receives the wirelessly transferred energy in the secondary receiver pad, the second stage controlling energy transfer to one or more loads via the output bus, the first stage, the second stage, and the output power bus comprising at least a portion of an inductive power transfer (“
IPT”
) system;
a measurement module that measures a voltage and a current, the voltage and current measured on one or more of the output bus and an input to the IPT system;a max efficiency module that determines, using the voltage and current measured by the measurement module, a maximum efficiency for the IPT system, the max efficiency module using one or more models of elements of the IPT system varying parameters of the IPT system within the one or more models of the IPT system to iterate to a maximum efficiency; and
an adjustment module that adjusts one or more parameters in the IPT system consistent with the maximum efficiency calculated by the max efficiency module,wherein the one or more parameters varied by the max efficiency module and adjusted by the adjustment module comprise one or more of a duty cycle reference that adjusts a duty cycle of a switching power converter of the second stage and a conduction angle reference that adjusts conduction angle of a switching power converter of the first stage, wherein one parameter is used as the primary control variable and another parameter is updated to regulate output power. - View Dependent Claims (16, 17, 18, 19)
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20. A method comprising:
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measuring a voltage and a current of an inductive power transfer (“
IPT”
) system, the voltage comprising one or more of an output voltage and an input voltage, the current comprising one or more of an output current and an input current, the output voltage and the output voltage measured at an output of the IPT system, the input voltage and the input current measured at an input of the IPT system;determining, using the measured voltage and current, a maximum efficiency for the IPT system using one or more models of elements of the IPT system and varying parameters of the IPT system-within the one or more models of the IPT system to iterate to a maximum efficiency; and
adjusting one or more parameters in the IPT system consistent with the calculated maximum efficiency,wherein the IPT system includes a first stage and a second stage, wherein the first stage transmits energy wirelessly and the second stage receives the wirelessly transferred energy and controls energy transfer to one or more loads via an output bus, wherein the output voltage and the output current are measured on the output bus, wherein varying parameters of the IPT system comprises varying one or more of a duty cycle reference that adjusts a duty cycle of the second stage and a conduction angle reference that adjusts conduction angle of the first stage and adjusting the one or more parameters comprises adjusting one or more of a duty cycle reference that adjusts a duty cycle of the second stage and a conduction angle reference that adjusts conduction angle of the first stage, wherein one parameter is used as the primary control variable and another parameter is updated to regulate output power. - View Dependent Claims (21, 22, 23)
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Specification