DC/DC converters having dual, EMI-quiet outputs
First Claim
1. A DC/DC converter, comprising:
- a first subcircuit, having a series-coupled first switch, first inductor and first capacitor and an output across said first capacitor, coupled between first and second DC input rails;
a second subcircuit, having a second switch, second inductor and second capacitor and an output across said second capacitor, coupled between said first and second DC input rails in anti-parallel with said first subcircuit;
a first diode coupling a node between said first switch and said first inductor and a node between said second inductor and said second capacitor; and
a second diode coupling a node between said first inductor and said first capacitor and a second node between said second switch and said second inductor.
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Accused Products
Abstract
Various DC/DC converter topologies having improved electromagnetic interference (EMI) characteristics and methods of providing dual DC outputs with such converters. One embodiment of one DC/DC converter having dual, EMI-quiet outputs includes: (1) a first subcircuit, having a series-coupled first switch, first inductor and first capacitor and an output across the first capacitor, coupled between first and second DC input rails, (2) a second subcircuit, having a second switch, second inductor and second capacitor and an output across the second capacitor, coupled between the first and second DC input rails in anti-parallel with the first subcircuit, (3) a first diode coupling a node between the first switch and the first inductor and a node between the second inductor and the second capacitor and (4) a second diode coupling a node between the first inductor and the first capacitor and a second node between the second switch and the second inductor. A further embodiment adds third and fourth series-coupled capacitors coupling the first and second DC input rails and replaces the first and second diodes with: (1) a first converter diode coupling a node between the first switch and the first inductor and a node between the second switch and the second inductor, (2) a first snubber diode coupling a node between the third and fourth capacitors and the node between the first switch and the first inductor and (3) a second snubber diode coupling the node between the third and fourth capacitors and the node between the second switch and the second inductor.
30 Citations
20 Claims
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1. A DC/DC converter, comprising:
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a first subcircuit, having a series-coupled first switch, first inductor and first capacitor and an output across said first capacitor, coupled between first and second DC input rails; a second subcircuit, having a second switch, second inductor and second capacitor and an output across said second capacitor, coupled between said first and second DC input rails in anti-parallel with said first subcircuit; a first diode coupling a node between said first switch and said first inductor and a node between said second inductor and said second capacitor; and a second diode coupling a node between said first inductor and said first capacitor and a second node between said second switch and said second inductor. - View Dependent Claims (2, 3, 4, 5)
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6. A method of providing dual DC outputs with a DC/DC converter, comprising the steps of:
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processing a first portion of DC input power through a first subcircuit having a series-coupled first switch, first inductor and first capacitor and an output across said first capacitor and coupled between first and second DC input rails; processing a second portion of said DC input power through a second subcircuit having a second switch, second inductor and second capacitor and an output across said second capacitor and coupled between said first and second DC input rails in anti-parallel with said first subcircuit; selectively conducting power through a first diode coupling a node between said first switch and said first inductor and a node between said second inductor and said second capacitor; and selectively conducting power through a second diode coupling a node between said first inductor and said first capacitor and a second node between said second switch and said second inductor. - View Dependent Claims (7, 8, 9, 10)
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11. A DC/DC converter, comprising:
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a first subcircuit, having a series-coupled first switch, first inductor and first capacitor and an output across said first capacitor, coupled between first and second DC input rails; a second subcircuit, having a second switch, second inductor and second capacitor and an output across said second capacitor, coupled between said first and second DC input rails in anti-parallel with said first subcircuit; third and fourth series-coupled capacitors coupling said first and second DC input rails; a first converter diode coupling a node between said first switch and said first inductor and a node between said second switch and said second inductor; a first snubber diode coupling a node between said third and fourth capacitors and said node between said first switch and said first inductor; and a second snubber diode coupling said node between said third and fourth capacitors and said node between said second switch and said second inductor. - View Dependent Claims (12, 13, 14, 15)
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16. A method of providing dual DC outputs with a DC/DC converter, comprising the steps of:
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processing a first portion of DC input power through a first subcircuit having a series-coupled first switch, first inductor and first capacitor and an output across said first capacitor and coupled between first and second DC input rails; processing a second portion of DC input power through a second subcircuit having a second switch, second inductor and second capacitor and an output across said second capacitor and coupled between said first and second DC input rails in anti-parallel with said first subcircuit; processing a third portion of said DC input power through third and fourth series-coupled capacitors coupling said first and second DC input rails; selectively conducting power through a first converter diode coupling a node between said first switch and said first inductor and a node between said second switch and said second inductor; selectively conducting power through a first snubber diode coupling a node between said third and fourth capacitors and said node between said first switch and said first inductor; and selectively conducting power through a second snubber diode coupling said node between said third and fourth capacitors and said node between said second switch and said second inductor. - View Dependent Claims (17, 18, 19, 20)
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Specification