Power factor correction circuit
First Claim
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1. A bridgeless power factor correction (PFC) circuit, comprising:
- a first node and a second node, wherein one of the first and second nodes is connected to a power supply, and the other of the first and second nodes is connected to the power supply through an inductor;
a first current path including a first semiconductor device and a first switch element, wherein the first current path is connected between the first and second nodes and configured to allow current to flow during a positive cycle of the power supply to charge the inductor; and
a second current path including a second semiconductor device and a second switch element, wherein the second current path is connected between the first and second nodes and configured to allow current to flow during a negative cycle of the power supply to charge the inductor,wherein one of the first and the second current paths further comprises a first sensing element and a second sensing element, wherein the first and second sensing elements are oppositely connected in series.
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Abstract
A bridgeless power factor correction (PFC) circuit has first and second nodes, and first and second current paths connected between the first and second nodes. The first current path includes a first semiconductor device and a first switch element, and the second current path includes a second semiconductor device and a second switch element. One of the first and the second current paths further includes first and second sensing elements that are oppositely connected in series.
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Citations
20 Claims
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1. A bridgeless power factor correction (PFC) circuit, comprising:
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a first node and a second node, wherein one of the first and second nodes is connected to a power supply, and the other of the first and second nodes is connected to the power supply through an inductor; a first current path including a first semiconductor device and a first switch element, wherein the first current path is connected between the first and second nodes and configured to allow current to flow during a positive cycle of the power supply to charge the inductor; and a second current path including a second semiconductor device and a second switch element, wherein the second current path is connected between the first and second nodes and configured to allow current to flow during a negative cycle of the power supply to charge the inductor, wherein one of the first and the second current paths further comprises a first sensing element and a second sensing element, wherein the first and second sensing elements are oppositely connected in series. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A power converter circuit, comprising:
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a first branch comprising a first current conduction element and a second current conduction element, wherein a first node is located between the first current conduction element and the second current conduction element, and is couplable to a first terminal of a power supply; and a second branch connected in parallel with the first branch, wherein the second branch comprises a first switch element, a second switch element, a first sensing element, and a second sensing element, wherein a second node between the first switch element and the second switch element is couplable to a second terminal of the power supply through an inductor, wherein the first and second sensing elements are oppositely connected, and a series connection of the first and second sensing elements is coupled between the second node and one of the first and second current conduction elements, and wherein one of the first and second sensing elements samples current during a positive cycle of the power supply, while the other of the first and second sensing elements samples current during a negative cycle of the power supply. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. A system having first and second output terminals, the system comprising:
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a power supply having a first terminal and a second terminal; an inductor having a first terminal coupled to the second terminal of the power supply, and a second terminal; first and second conduction devices respectively coupled between the first terminal of the power supply and the first and second output terminals; first and second switch devices respectively coupled between the second terminal of the inductor and the first and second output terminals; and first and second current sensing devices connected in series between the second terminal of the inductor and one of the first and second output terminals, wherein one of the first and second current sensing devices samples current through a respective one of the first or second switch devices during a first half cycle of the power supply, while the other of the first and second current sensing devices samples current through the one of the first or second switch devices during a second half cycle of the power supply. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification