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From the articleChoose an STM32 by System Cost, Not by Price or Clock Speed
Inverter air conditioning typically saves 20–40% over fixed-speed, and the saving is not a marketing line — it is a power-semiconductor upgrade. As Silan, China Resources Micro, NCE Power and StarPower fill out IGBT, IPM and MOSFET lines, the appliance BOM gains a second source just as power devices post 10–20% price increases.
A fixed-speed air conditioner is switch control: room too warm, compressor on; target reached, compressor off. Simple and cheap — but temperature swings, high inrush at every start, and frequent cycling that costs both energy and comfort over long runs.
An inverter unit modulates compressor speed instead. High frequency at start-up to pull the room down fast, then lower frequency to hold the setpoint. Smaller temperature swing, less noise, smoother compressor duty, lower long-run consumption.
The 20–40% figure is not fixed — it is highly scenario-dependent. Short run times show little advantage. Long summer-night operation in a well-insulated room, where the unit holds close to setpoint, is where the inverter compressor drops frequency and avoids repeated inrush, and the saving shows up.
On price, the two to watch are IGBT/IPM and MOSFET. Several makers have publicly confirmed 10–20% increases on MOSFET and IGBT lines. Peak appliance season stacked on rising power-device cost puts visible pressure on the inverter control board.
High-reliability appliance power devices used to sit largely with overseas brands. That has changed materially.
| Role | Supplier | Note |
|---|---|---|
| Incumbent / benchmark | Infineon · Mitsubishi · onsemi · ST | Established white-goods IGBT / IPM supply |
| China-based alternative | Silan · China Resources Micro | Low- and mid-voltage MOSFET, IGBT, IPM; closest to the appliance IPM mainstream |
| China-based alternative | StarPower · Macmic | Module strength; better suited to mid-to-high power and commercial units |
| China-based alternative | NCE Power · Yangjie · JJW | Discretes, rectifier bridges, fast-recovery diodes filling out the periphery |
Not simply a lower unit price. Three things:
The gap between inverter and fixed-speed is not "does the compressor vary speed" — it is the whole electronic control chain. IGBT/IPM handle efficient inversion, the MCU carries the control algorithm, PFC and power devices carry efficiency and stability, sensors close the loop. What looks like an appliance upgrade at the shelf is a power-semiconductor maturity story underneath. For a buyer, seasonal appliance demand is best read not from unit sales but from component data: for air conditioning, watch IGBT, IPM, MOSFET, PFC and motor-control MCU.
The supply movement behind this piece, as recorded in the data. Figures are point-in-time snapshots carrying the date they were captured — they may have moved since publication.
