System and method for charging and discharging a superconducting coil
First Claim
1. A system for charging and discharging a superconducting coil, comprising:
- a boost converter coupled to a low-voltage bus and a high-voltage bus and configured to boost voltage from a low-voltage to a high-voltage;
an energy storage element coupled across the high-voltage bus;
a redundant, two quadrant buck converter coupled to the high-voltage bus, the buck converter including an interface reactor and parallel pairs of solid-state switches and respective flyback diodes; and
,a controller switching the solid state switches in a non-current reversing, polarity reversing mode to selectively charge the coil from the energy storage element and discharge the coil to the energy storage element.
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Abstract
A system and method for charging and discharging a superconducting coil. The system comprising a boost converter coupled between a low-voltage bus and a high voltage bus, and a buck converter coupled between the high-voltage bus and the coil. The system being configured to charge and discharge the coil without reversing the current while reversing polarity, and to only supply high-voltages when necessary. The system further comprising means to dissipate excess energy during discharge. The method comprising pulse width modulating the solid-state switch of a boost converter to achieve a high-voltage from a low-voltage and then switching solid-state switches of a buck regulator to charge or discharge the coil in a non current reversing, polarity reversing manner.
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Citations
24 Claims
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1. A system for charging and discharging a superconducting coil, comprising:
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a boost converter coupled to a low-voltage bus and a high-voltage bus and configured to boost voltage from a low-voltage to a high-voltage; an energy storage element coupled across the high-voltage bus; a redundant, two quadrant buck converter coupled to the high-voltage bus, the buck converter including an interface reactor and parallel pairs of solid-state switches and respective flyback diodes; and
,a controller switching the solid state switches in a non-current reversing, polarity reversing mode to selectively charge the coil from the energy storage element and discharge the coil to the energy storage element. - View Dependent Claims (2, 3, 4, 5)
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6. A system for charging and discharging a superconducting coil, comprising:
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a boost converter coupled to a low-voltage bus and a high-voltage bus and configured to boost voltage from a low-voltage to a high-voltage; an energy storage element coupled across the high-voltage bus; a low-voltage supply bridge coupled to the low-voltage bus and including a pair of switches and flyback diodes; a high-voltage booster bridge coupled to the high-voltage bus and to the low-voltage supply bridge and including a pair of solid-state switches and respective flyback diodes; and a controller switching the pair of switches of the supply bridge and pair of solid state switches of the booster bridge in a non-current reversing, polarity reversing mode to selectively charge the coil from the energy storage element at voltages between the low-voltage and a sum of the low and high-voltages, and discharge the coil to the energy storage element. - View Dependent Claims (7, 8, 9, 10)
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11. A system for charging and discharging a superconducting coil, comprising:
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a boost converter coupled to a low-voltage bus and a high-voltage bus and configured to boost voltage from a low-voltage to a high-voltage; a buck regulator coupled to the boost converter and to the high and low-voltage buses and configured to return energy to a system bus; an energy storage element coupled across the high-voltage bus; a low-voltage supply bridge coupled to the low-voltage bus and including a pair of switches and flyback diodes; a high-voltage booster bridge coupled to the high-voltage bus and to the low-voltage supply bridge and including a pair of solid-state switches and respective flyback diodes; and a controller switching the pair of switches in the supply bridge and the pair of solid state switches in the booster bridge in a non-current reversing, polarity reversing mode to selectively charge the coil from the energy storage element at voltages between the low-voltage and a sum of the low and high-voltages, and discharge the coil to the energy storage element. - View Dependent Claims (12, 13, 14, 15)
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16. A system for charging and discharging a superconducting coil, comprising:
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a dc/dc converter coupled to a low-voltage bus and a high-voltage bus and configured to convert a low-voltage to a high-voltage; an energy storage element coupled across the high-voltage bus; a first two quadrant buck converter coupled to the high-voltage bus, the buck converter including a pair of solid-state switches and respective flyback diodes; a second two quadrant buck converter coupled to the low-voltage bus, the buck converter including a second pair of solid-state switches and respective flyback diodes; and a controller switching the first and second two quadrant buck converters in a non-current reversing, polarity reversing mode to selectively charge and discharge the coil. - View Dependent Claims (17, 18, 19, 20, 21)
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22. A method for charging and discharging a superconducting coil comprising:
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pulse width modulating a boost switch to generate a high-voltage from a relatively low-voltage, the boost switch making up part of a boost converter; switching on both a first and a second solid-state switches of a low-voltage supplier bridge, the low-voltage supplier bridge being coupled to a coil, a low-voltage bus, and a high-voltage booster bridge; and pulse width modulating a first solid-state switch of the high-voltage booster bridge to charge the coil with a desired voltage, the booster bridge being coupled to a high-voltage bus, a low-voltage bus, and a low-voltage supplier bridge; switching on a second solid-state switch of the high-voltage booster bridge to discharge the coil in a non-current reversing, polarity reversing manner to an energy storage element which is coupled across the high-voltage bus; and controlling all switching through control signals from a controller. - View Dependent Claims (23, 24)
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Specification