Non-contact rotary power transfer system
First Claim
1. A control system for controlling a power inverter disposed on a stationary side of an imaging system and configured to deliver power to a radiation source and one or more other elements disposed on a rotating side of the imaging system, the control system comprising:
- a control element disposed on the rotating side and coupled to a high voltage output module for supplying power at a first voltage to the radiation source and an auxiliary output regulator for supplying power at a second voltage lower than the first voltage to the one or more other elements, wherein the control element is configured to receive information from the high voltage output module and the auxiliary output regulator and generate a first analog timing signal for controlling the power inverter;
a modulator configured to combine the first analog timing signal with a second signal to yield a modulated signal;
a first rotary transformer configured to transmit the modulated signal from the rotating side to the stationary side and comprising;
a first gate drive winding disposed on the rotating side and coupled to the control element; and
a second gate drive winding disposed on the stationary side; and
gate drive circuitry disposed on the stationary side and coupled between the second gate drive winding and one or more gate terminals of one or more transistors of the power inverter, wherein the gate drive circuitry comprises a demodulator configured to receive the modulated signal, separate the first analog timing signal from the second signal, and apply the first analog timing signal directly to the one or more gate terminals.
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Accused Products
Abstract
A power delivery system includes a rotary transformer having a primary winding and a secondary winding and configured to transfer power between stationary coupling elements on a stationary side and rotational coupling elements on a rotational side. The rotational coupling elements share a central axis with the stationary coupling elements, and are adapted to rotate with respect to the stationary coupling elements. The power delivery system includes an isolation transformer that drives the primary winding of the rotary transformer, and a plurality of power inverter stages whose outputs are adapted to be summed and coupled to the rotary transformer. A plurality of output power converters receive transmitted power from the rotary transformer. A plurality of control elements, disposed on the rotating side, are configured to close a feedback loop on desired and actual performance of the output power converters, and to control the power inverter stages.
24 Citations
20 Claims
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1. A control system for controlling a power inverter disposed on a stationary side of an imaging system and configured to deliver power to a radiation source and one or more other elements disposed on a rotating side of the imaging system, the control system comprising:
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a control element disposed on the rotating side and coupled to a high voltage output module for supplying power at a first voltage to the radiation source and an auxiliary output regulator for supplying power at a second voltage lower than the first voltage to the one or more other elements, wherein the control element is configured to receive information from the high voltage output module and the auxiliary output regulator and generate a first analog timing signal for controlling the power inverter; a modulator configured to combine the first analog timing signal with a second signal to yield a modulated signal; a first rotary transformer configured to transmit the modulated signal from the rotating side to the stationary side and comprising; a first gate drive winding disposed on the rotating side and coupled to the control element; and a second gate drive winding disposed on the stationary side; and gate drive circuitry disposed on the stationary side and coupled between the second gate drive winding and one or more gate terminals of one or more transistors of the power inverter, wherein the gate drive circuitry comprises a demodulator configured to receive the modulated signal, separate the first analog timing signal from the second signal, and apply the first analog timing signal directly to the one or more gate terminals. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A control system for controlling a power inverter disposed on a stationary side of a computed tomography (CT) system and configured to deliver power to a plurality of element disposed on a rotating side of the CT system, the control system comprising:
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a control element disposed on the rotating side and coupled to an auxiliary output regulator for generating a first voltage output applied to a first element of the plurality of elements and generating a second voltage output different than the first voltage output and applied to a second element of the plurality of elements, wherein the control element is configured to; determine a desired pulse width of signals output from the power inverter and generate a timing signal have the desired pulse width based upon at least one of a voltage or current command and at least one of a voltage or current feedback from at least one of the first element or the second element, and manage the first voltage output and the second voltage output; a modulator configured to combine the timing signal with a second signal to yield a modulated signal; a rotary transformer configured to transmit the modulated signal from the rotating side to the stationary side and comprising; a first gate drive winding disposed on the rotating side and coupled to the control element; and a second gate drive winding disposed on the stationary side; and gate drive circuitry disposed on the stationary side and coupled between the second gate drive winding and one or more gate terminals of one or more transistors of the power inverter, wherein the gate drive circuitry comprises a demodulator configured to receive the modulated signal, separate the timing signal from the second signal, and apply the timing signal to the one or more gate terminals. - View Dependent Claims (16, 17)
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18. A control system for controlling a power inverter disposed on a stationary side of a computed tomography (CT) system and configured to deliver power to a radiation source disposed on a rotating side of the CT system, the control system comprising:
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a control element disposed on the rotating side and coupled to a high voltage module configured to supply power to the radiation source, wherein the control element is configured to generate an analog timing signal for controlling the power inverter, configured to generate a first communication signal, and configured to generate a filament drive signal for driving the radiation source; a modulator configured to combine the analog timing signal with the first communication signal to yield a modulated signal; a rotary transformer configured to transmit the modulated signal from the rotating side to the stationary side and comprising; a first gate drive winding disposed on the rotating side and coupled to the control element; and a second gate drive winding disposed on the stationary side and coupled to the power inverter; and gate drive circuitry disposed on the stationary side and coupled between the second gate drive winding and one or more gate terminals of one or more transistors of the power inverter, wherein the gate drive circuitry comprises a demodulator configured to receive the modulated signal, separate the analog timing signal from the first communication signal, and apply the analog timing signal to the one or more gate terminals, wherein the analog timing signal remains in an analog domain from a time at which the analog timing signal is generated at the control element until a time at which the analog timing signal is applied to the one or more gate terminals. - View Dependent Claims (19, 20)
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Specification