System and method for power conversion using semiconductor switches having reverse voltage withstand capability
First Claim
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1. A power converter system for supplying power to an electrical load, the power converter system comprising:
- a power converter circuit adapted to perform an AC to DC power conversion and comprising a plurality of semiconductor switches having reverse voltage withstand capability;
a power factor control loop for regulating a power factor;
a DC voltage control loop for regulating an output DC voltage; and
a controller coupled to the power converter circuit for regulating switching of the plurality of semiconductor switches based on a feedback signal received from at least one of the power factor control loop and the DC voltage control loop; and
an active clamp circuit coupled to the power converter circuit for regulating DC bus voltage overshoots, wherein the active clamp circuit comprises;
a capacitor connected across a DC bus and charged to a DC bus voltage;
a buck converter circuit for discharging the capacitor when voltage across the capacitor exceeds a reference value; and
a boost converter circuit for charging the capacitor when voltage across the capacitor falls below the reference value.
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Abstract
A power converter system is provided for supplying power to an electrical load. The power converter system includes a power converter circuit adapted to perform an AC to DC power conversion and an active clamp circuit coupled to the power converter circuit for regulating DC bus voltage overshoots. The power converter circuit is configured from a plurality of semiconductor switches having reverse voltage withstand capability.
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Citations
25 Claims
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1. A power converter system for supplying power to an electrical load, the power converter system comprising:
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a power converter circuit adapted to perform an AC to DC power conversion and comprising a plurality of semiconductor switches having reverse voltage withstand capability; a power factor control loop for regulating a power factor; a DC voltage control loop for regulating an output DC voltage; and a controller coupled to the power converter circuit for regulating switching of the plurality of semiconductor switches based on a feedback signal received from at least one of the power factor control loop and the DC voltage control loop; and an active clamp circuit coupled to the power converter circuit for regulating DC bus voltage overshoots, wherein the active clamp circuit comprises; a capacitor connected across a DC bus and charged to a DC bus voltage; a buck converter circuit for discharging the capacitor when voltage across the capacitor exceeds a reference value; and a boost converter circuit for charging the capacitor when voltage across the capacitor falls below the reference value. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A power converter system for supplying power to an electrical load, the power converter system comprising:
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a power converter circuit adapted to perform an AC to DC power conversion and comprising a plurality of semiconductor switches having reverse voltage withstand capability; and an active clamp circuit coupled to the power converter circuit for regulating DC bus voltage overshoots, wherein the active clamp circuit is configured to discharge a capacitor connected across a DC bus when voltage across the capacitor exceeds a reference value and charge the capacitor when voltage across the capacitor falls below the reference value. - View Dependent Claims (14, 15, 16, 17, 18)
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19. A method for performing an AC to DC power conversion, the method comprising:
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converting an input AC voltage to an output DC voltage via a plurality of semiconductor switches having reverse voltage withstand capability; regulating power factor via a power factor control loop; regulating the output DC voltage via a DC voltage control loop; regulating switching of the plurality of semiconductor switches based on a feedback signal received from at least one of the power factor control loop and the DC voltage control loop via a controller; and regulating DC bus voltage overshoots by discharging a capacitor connected across a DC bus when voltage across the capacitor exceeds a reference value and charging the capacitor when voltage across the capacitor falls below the reference value. - View Dependent Claims (20, 21, 22, 23, 24)
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25. A power converter system for supplying power to an electrical load, the power converter system comprising:
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a power converter circuit adapted to perform an AC to DC power conversion and comprising a plurality of semiconductor switches having reverse voltage withstand capability; a power factor control loop for regulating a power factor; a DC voltage control loop for regulating an output DC voltage; a controller coupled to the power converter circuit for regulating switching of the plurality of semiconductor switches based on a feedback signal received from at least one of the power factor control loop and the DC voltage control loop; and an active clamp circuit coupled to the power converter circuit and configured to discharge a capacitor connected across a DC bus when voltage across the capacitor exceeds a reference value and charge the capacitor when voltage across the capacitor falls below the reference value.
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Specification