Microinverter Reference Design
An illustrative module-level microinverter reference design for the PV generation side: DC input from 1–2 modules (20–60 V) passes surge clamping and power-line common-mode filtering; current transformers provide cycle-by-cycle current sensing on the interleaved flyback / push-pull primary; the main power transformer steps the voltage up, followed by rectification and a line-frequency unfolding bridge that feeds the grid directly; the high-side drivers are powered by a push-pull isolated supply. Each position is marked with the VOOHU parts available, recommended part numbers and package pinouts.
Illustrative PCB ⇄ Schematic
Illustrative top-side view arranged by functional zone (not the actual layout). Red numbered dots mark positions VOOHU can supply. Click a component on the board, an entry in the index below or a part in the schematic to see recommended parts and package pinouts on the right.
Illustrative module input and boost stage topology: the module enters the primary through MC4 input J1, bidirectional TVS D1 (WHTB058VA) and the power-line common-mode choke L1 (WHAL-1513A-301T0); the VOOHU current transformer T1 (WHPT-ER115-006) has its primary in series with the loop of primary MOSFET Q1, and its secondary feeds the DSP through sense resistor Rb for cycle-by-cycle current sensing; main power transformer T2 is a custom position. Only the positive line is drawn; input capacitors, clamp / snubber and MOSFET support circuitry are not drawn.
Board bill of materials
Summarized by position; click any row to locate it on the board above.
| No. | Zone | Position | Ref. | VOOHU category | Recommended part | Availability |
|---|---|---|---|---|---|---|
| 01 | A PV module input | PV input (MC4) | J1 | — | — | Non-VOOHU |
| 02 | A PV module input | Bidirectional input TVS | D1 | TVS ESD | WHTB058VA | VOOHU |
| 03 | A PV module input | Input power-line common-mode choke | L1 | Power Line Common Mode Chokes | WHAL-1513A-301T0 | VOOHU |
| 04 | B Boost stage | Primary CT | T1 | Current Transformers | WHPT-ER115-006 | VOOHU |
| 05 | B Boost stage | Primary-side power MOSFETs (interleaved flyback / push-pull) | Q1 | — | — | Non-VOOHU |
| 06 | B Boost stage | Primary-side gate driver | U2 | — | — | Non-VOOHU |
| 07 | B Boost stage | Main power transformer (custom) | T2 | — | — | Non-VOOHU |
| 08 | C Grid-tie output | High-voltage rectifier + line-frequency unfolding bridge | Q2 | — | — | Non-VOOHU |
| 09 | C Grid-tie output | Unfolding bridge isolated driver | U3 | — | — | Non-VOOHU |
| 10 | C Grid-tie output | Grid-tie output filter inductor | L2 | — | — | Non-VOOHU |
| 11 | C Grid-tie output | Push-pull driver + rectifier / LDO | U4 | — | — | Non-VOOHU |
| 12 | C Grid-tie output | Push-pull isolation transformer | T3 | Push-Pull Transformers | WHST06001A0 | VOOHU |
| 13 | C Grid-tie output | AC grid terminal | J2 | — | — | Non-VOOHU |
| 14 | D Control core | DSP (MPPT + grid-tie control) | U1 | — | — | Non-VOOHU |
| 15 | E Aux supply | Wide-input buck converter (PV module → 12 V) | U5 | — | — | Non-VOOHU |
| 16 | E Aux supply | Buck converter (12 V → 3.3 V) | U6 | — | — | Non-VOOHU |
| 17 | E Aux supply | Molded inductors ×2 (auxiliary power) | L3 L4 | Molded Inductors | WHYT0630 Series | VOOHU |
Resources & downloads
Board bill of materials
Reference designators, zones, VOOHU categories, recommended parts and availability for all 17 positions. Opens directly in Excel.
Datasheet collection
Datasheet PDFs for the VOOHU parts recommended on this board.
Design files & footprint library
Schematic, PCB, and VOOHU part footprints and 3D models.
Coming soonRequest the microinverter reference design full package
Includes the full-board position list, datasheets for the recommended VOOHU parts and position-by-position selection notes. For advice tailored to your power rating (300 W–2 kW), topology (interleaved flyback / LLC) or a custom main power transformer, please include it in your requirements. We reply within 24 hours on working days.
