| 摘要 |
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.
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