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QPI-21LZ-01 Datasheet(PDF) 5 Page - Vicor Corporation |
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QPI-21LZ-01 Datasheet(HTML) 5 Page - Vicor Corporation |
5 / 15 page There are two basic topologies for the connection of the re- circulating “Y” capacitors, referred to as “open-frame” and “base- plate”. Figure 4 illustrates how a converters total conducted noise profile can vary with one topology versus another. The EMI generated by the “base-plate” configuration is much greater than that generated by the “open-frame” in this example. Selecting the right topology will greatly reduce the amount of EMI signal that needs to be filtered. Figure 2 shows the base-plate topology of re-circulating “Y” capacitors. Here, CY1 to CY4 are connected to each power node of the dc-dc converter, and then are connected together on a copper shield plane created under the converter. The addition of the copper shield plane helps in the containment of the radiated EMI, converting it back to conducted EMI and shunting it back to its source. In Figure 5, the open-frame topology is shown where the “Y” capacitors (CY1 and CY2) re-circulate the EMI signals between the positive input and output, and the negative input and output nodes of the power conversion stage. Safety and system requirements may dictate that some converters must have the output return (-) directly connected to earth ground. This connection can impact performance of some filter solutions, where the QPI-21 works well in this configuration. Quiet-Power® Rev 1.5 vicorpower.com Page 5 of 15 08/2015 800 927.9474 QPI-21 Figure 4 — An unfiltered converter’s response to “open-frame” (light blue) and “base-plate” (purple) EMI configurations CY1 CY2 Shield BUS+ QPI+ BUS- QPI- IN+ IN- OUT+ OUT- BUS+ BUS- Chassis/Shield CB1 CIN LOAD + + PC PR SENSE+ SC SENSE- XY+ XY- Optional Chassis Connection Figure 5 — Typical “open-frame" application with an optional connection of the chassis to OUT- of the converter |
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