EV Charging Infrastructure Manufacturing worked example

Power Module Yield at 99% target power module first-pass yield: a worked example

This scenario runs the power module yield calculation on the strong side: 99% target power module first-pass yield, with every other input held at its documented default. a quality engineer needs first-pass yield for charger power modules before cabinet integration

The inputs for this scenario

  • Power modules passing first-pass test: 188 modules (unchanged)
  • Power modules tested: 200 modules (unchanged)
  • Target power module first-pass yield: 99 % (raised for this scenario; the documented default is 96)

Working through the calculation

  • Applying the documented formula (Power module first-pass yield = passing power modules ÷ power modules tested × 100) to the inputs above produces each figure below.
  • At this operating point the engine returns 94 % for power module first-pass yield, the number this scenario is built around.
  • At this operating point the engine returns 5 points for gap to power module yield target.
  • At this operating point the engine returns 188 modules for power modules passing first-pass test.
  • At this operating point the engine returns 200 modules for power modules tested.

How this compares with the baseline

  • Against the tool's baseline example, where target power module first-pass yield sits at 96% and the headline result is 94 %, this scenario lands almost exactly on the baseline at 94 %.
  • Use it at end of shift, after a production lot, or during a yield-improvement project to track whether power module FPY is meeting the number quoted to program management. Treat this as a target state: the delta against the baseline quantifies what the improvement is worth before you commit to chasing it.

Results at a glance

  • Power module first-pass yield: 94 % (headline result)
  • Gap to power module yield target: 5 points
  • Power modules passing first-pass test: 188 modules
  • Power modules tested: 200 modules

Run it with your numbers

  • Every input above is editable in the live Power Module Yield calculator, which recalculates instantly and can be shared with the inputs intact.

Last reviewed 2026-05-12.