3PH-VSI
Three-phase voltage-source inverter
A three-leg bridge producing the documented three-phase output from a DC-link source.
Schematic / SLD
Symbols · NPC
Neutral-point-clamped inverter
A multilevel switching arrangement using the documented split DC link and neutral-point clamping paths.
Schematic / SLD · NPC
What it represents
A multilevel switching arrangement using the documented split DC link and neutral-point clamping paths.
On a schematic, identify the split-link midpoint, clamping devices and phase-leg switches and trace the phase output and DC-link balancing/control references. Keep the component tag and signal/reference names consistent across the control drawing, terminal schedule and device documentation.
NPC identifies a specific multilevel arrangement; active-NPC variants replace parts of the clamping arrangement and need separate device documentation.
The preview is a conceptual topology reference rather than a complete power-stage circuit. Switching sequences, magnetic design, component selection and control/protection details belong in the equipment design documentation.
How to read it
- Identify the split-link midpoint, clamping devices and phase-leg switches.
- Trace the phase output and DC-link balancing/control references.
Information to show or reference
- Label the split-link midpoint, clamping devices and phase-leg switches.
- Cross-reference the phase output and DC-link balancing/control references.
- Add the selected device or circuit documentation revision, power/reference connections and project signal convention.
A distinction that matters
NPC identifies a specific multilevel arrangement; active-NPC variants replace parts of the clamping arrangement and need separate device documentation.
Sources you can follow
These public references support the explanation and provide further detail. Their graphics and downloadable files remain with their publishers.
Multilevel NPC converter application context
Public primary manufacturer documentation establishes the component function or circuit/topology relationship. Preview geometry and drafting explanations are independently authored.
About this graphic
This illustration was authored independently by Elora Grid to explain the concept. It is not reproduced from a customer drawing, an official standard graphic or a manufacturer CAD file. Its correspondence to an exact IEC or IEEE symbol identifier has not been certified.
SVG and DXF downloads contain this original artwork. DXF uses unscaled drawing units; a GA envelope supplies no product dimensions, clearances or fabrication information. Original artwork is available under CC BY 4.0. Third-party references retain their own terms.
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