The same question keeps coming up in engineer groups lately: do IPMs now have to integrate PFC? Are plain inverter IPMs without PFC still usable? Conclusion first: no device standard today requires an IPM to include PFC. What engineers are actually feeling is the appliance side — inverter air conditioner, heat pump and industrial drive platforms face tighter harmonic, efficiency and EMC requirements every year — not a new 'PFC-mandatory' standard for the modules themselves. This post separates device standards from appliance regulations, then gives you a decision order for selection.
First, Separate Two Things: Device Standards Are Not Appliance Regulations
An IPM standard looks at the module itself: gate drive, protection, isolation, thermal performance, reliability. PFC is not on that list as a mandatory function. So both product types on the market are fully usable: the traditional inverter-only IPM that integrates the three-phase bridge, and the PFC + inverter integrated IPM that puts a boost PFC stage and the inverter into one package.
- Standards define what performance the IPM itself must meet — not how the appliance must be built;
- It is appliance regulation that demands input power factor and harmonic compliance, not the device datasheet;
- So 'plain IPMs are dead' is a misread — discrete PFC plus a standard IPM remains a legal, common solution.
Why Everyone Suddenly Talks About PFC: the Appliance Changed
The real change is on the appliance side. Heat pumps, inverter air conditioners and industrial drives face stricter input-current harmonic, power factor and efficiency requirements every year, and the final product must pass EMC, harmonic and energy-efficiency testing. PFC's job is exactly that: pull the input current back in phase with the voltage and cut the low-order harmonics those tests measure. The PFC stage itself is evolving too — SiC Schottky diodes in boost PFC are increasingly used to trim reverse-recovery loss. All of this efficiency pressure lands on module selection, most visibly in HVAC inverters.
Why PFC-Integrated IPMs Keep Showing Up
The driver is product design moving toward smaller size, higher integration and lower development cost. Discrete PFC means more external parts, a bigger PCB, and more loop tuning and EMI work; a PFC + inverter integrated IPM concentrates those functions in one module — genuinely convenient for space-tight inverter appliances, heat pumps and small-to-mid power drives.
| Item | Discrete PFC + standard IPM | PFC-integrated IPM |
| External parts | Many (inductor, diode, switch separate) | Few (integrated) |
| PCB area | Large | Small |
| Debug & EMI | Loop + layout tuning on you | Optimized inside the module |
| Flexibility | Free mix per project | Tied to vendor config |
| Best fit | Mature platforms, cost-sensitive projects | New high-density designs |
How to Decide: Read the Appliance First, Then Ask About PFC
Don't start with 'does it have PFC' — start with what the appliance must pass. The real question today is not 'IPM or discrete' but at which level of integration you make the trade-off — the IPM vs discrete decision deserves its own pass.
- Next-gen inverter ACs, heat pumps, or products with tight size, efficiency and EMC targets: shortlist PFC-integrated IPMs to cut external parts and development work;
- Mature products, small-power equipment, cost-sensitive projects: discrete PFC + a standard IPM still works — no need to scrap a proven design over a 'new rule' rumor;
- Middle path: pass certification with discrete PFC first, switch to an integrated module at the next revision — lower risk;
- Whatever you pick, the final arbiter is the appliance test bench: input harmonics, power factor, temperature rise and EMI all passing means the architecture is valid.
One more note from the cost side: higher integration usually comes with a higher unit price, and whether it pays off depends on the external BOM and engineering hours it saves — we ran that math in when to switch to IPM modules; for the general industrial framework, see selecting an IPM for industrial inverter applications.
Bottom Line
The so-called 'IPM-PFC new rule' is more accurately a shift in component-selection trends driven by appliance compliance — not a new mandatory PFC function inside IPM standards. What an engineer should really watch is the final appliance test result, and how your product trades off efficiency, harmonics, EMI, cost and PCB space.
PFC-integrated IPMs are an increasingly common route. SHYSEMI's SIP-35 package IPM family ships with PFC built in and energy-efficiency optimization, suited to inverters, converters and motor control — and the platform's ruggedness has been proven in the lab repeatedly (see our 3x short-circuit test). If you are evaluating an integrated PFC design, start from the SIP35 line.
