Electric compressor — key device selection
Engineering problem
An electric A/C compressor drives 1–5 kW with high DC bus voltage and continuous duty. The inverter must handle high inrush at start, keep switching losses manageable in a confined aluminium housing, and report faults before thermal shutdown.
System block diagram
Block list (text version)
- Input protection TVS / HV protection
- Control Automotive MCU
- Gate drive Gate driver IC
- Power stage MOSFET / SiC MOSFET / IGBT
- Motor BLDC / PMSM (load)
- Sensing Current-sense amplifier / shunt
Input protection
Why this device： HV bus transients and pre-charge inrush can exceed the inverter's absolute maximum.
How to choose： Match the stand-off voltage to the maximum bus voltage including regenerative pumping, and check pulse energy.
| Part number | Brand | Category | Package | Qualification | Operating temperature | Key parameters | Docs | Actions |
|---|---|---|---|---|---|---|---|---|
| 1SMB30CAT3G In stock | onsemi | TVS Diodes | SMB | AEC-Q101 qualified | -55 °C ~ +150 °C | vrwm: 30 V · ppp: 600 W · direction: Uni-directional | Datasheet ↗ | |
| 1.5KE24CA-TP | MCC | Transient Voltage Suppressor | — | Qualification to be verified | To be confirmed | To be confirmed | Datasheet ↗ | |
| 1.5KE250A-TP In stock | MCC | TVS Diodes | DO-201AE | Qualification to be verified | To be confirmed | To be confirmed | Datasheet ↗ | |
| 1.5KE480A | WAYON | Transient Voltage Suppressor | — | Qualification to be verified | To be confirmed | To be confirmed | Datasheet ↗ | |
| 1.5SMC33CA | LITTLEFUSE | Transient Voltage Suppressor | — | Qualification to be verified | To be confirmed | To be confirmed | Datasheet ↗ | |
| 1.5SMC6.8CA In stock | Littelfuse | TVS Diodes | SMC | Qualification to be verified | To be confirmed | To be confirmed | To be confirmed |
Control
Why this device： Field-oriented control, PWM with dead-time, over-current and over-temperature diagnostics over CAN FD.
How to choose： FOC needs deterministic ADC sampling and sufficient MIPS; check the safety level expected by the OEM.
| Part number | Brand | Category | Package | Qualification | Operating temperature | Key parameters | Docs | Actions |
|---|---|---|---|---|---|---|---|---|
| MKE04Z8VWJ4 In stock | NXP | Microcontrollers (MCU) | SOIC-20 | AEC-Q100 Grade 1 qualified | -40 °C ~ +125 °C | core: Arm Cortex-M0+ · freq: 48 MHz · flash: 8 KB | Datasheet ↗ | |
| ATMEGA32A-AU In stock | Microchip | Microcontrollers (MCU) | TQFP-44 | Qualification to be verified | To be confirmed | To be confirmed | Datasheet ↗ | |
| ATSAM4S2AA-MU In stock | Microchip | Microcontrollers (MCU) | QFN-48 | Qualification to be verified | To be confirmed | To be confirmed | Datasheet ↗ | |
| BS83A01C In stock | Holtek | Microcontrollers (MCU) | SOT-23-6 | Qualification to be verified | To be confirmed | To be confirmed | Datasheet ↗ | |
| HT66F002/MSOP10 In stock | Holtek | Microcontrollers (MCU) | MSOP-10 | Qualification to be verified | To be confirmed | To be confirmed | Datasheet ↗ | |
| MM32F0010A1N In stock | MindMotion | MCU (Value Line) | QFN-20 | Qualification to be verified | To be confirmed | To be confirmed | Datasheet ↗ |
Sensing
Why this device： Phase current feedback for FOC and for short-circuit protection within microseconds.
How to choose： Common-mode range and response time matter more than DC accuracy here.
| Part number | Brand | Category | Package | Qualification | Operating temperature | Key parameters | Docs | Actions |
|---|---|---|---|---|---|---|---|---|
| INA199B2QDCKRQ1 In stock | TI | Amplifiers & Linear | SOT-SC70-6 | AEC-Q100 Grade 1 qualified | -40 °C ~ +125 °C | supply: 2.7 ~ 26 V · channel: 1 · bw: 105 kHz | Datasheet ↗ | |
| LM2901MX/NOPB In stock | TI | Amplifiers & Linear | SOIC-14 | AEC-Q100 Grade 1 qualified | -40 °C ~ +125 °C | channel: 4 · bw: 1.3 MHz · vos: ±2 mV | Datasheet ↗ | |
| ACE358MTR-E1 In stock | ACE | Operational Amplifiers | SOP-8 | Qualification to be verified | To be confirmed | To be confirmed | Datasheet ↗ | |
| AD822ARZ-REEL7 In stock | ADI | Operational Amplifiers | SOIC-8 | Qualification to be verified | To be confirmed | To be confirmed | Datasheet ↗ | |
| LM258DR2G In stock | onsemi | Operational Amplifiers (Op-Amp) | SOIC-8 | Qualification to be verified | To be confirmed | To be confirmed | Datasheet ↗ | |
| LM2903XK In stock | Runic | Comparators | SOT-23-5 | Qualification to be verified | To be confirmed | To be confirmed | Datasheet ↗ |
Gate drive
Why this device： High-side drive with short propagation delay and desaturation protection for the power stage.
How to choose： Check CMTI if isolated, propagation delay matching between channels, and fault clearing behaviour.
| Part number | Brand | Category | Package | Qualification | Operating temperature | Key parameters | Docs | Actions |
|---|---|---|---|---|---|---|---|---|
| FAN3224TMX In stock | onsemi | Gate Drivers | SOIC-8 | AEC-Q100 Grade 1 qualified | -40 °C ~ +125 °C | channel: 2 · current: 4 A · voltage: 18 V | Datasheet ↗ | |
| CFG2211S Available to order | Chipflow | Gate Drivers | SOP8 | Qualification to be verified | To be confirmed | To be confirmed | To be confirmed | |
| CFG2216M Available to order | Chipflow | Gate Drivers | MSOP10 | Qualification to be verified | To be confirmed | To be confirmed | To be confirmed | |
| CFG2241S Available to order | Chipflow | Gate Drivers | SOP8 | Qualification to be verified | To be confirmed | To be confirmed | To be confirmed | |
| CFG2242D Available to order | Chipflow | Gate Drivers | DFN10-3x3 | Qualification to be verified | To be confirmed | To be confirmed | To be confirmed | |
| CFG2246S Available to order | Chipflow | Gate Drivers | SOP8 | Qualification to be verified | To be confirmed | To be confirmed | To be confirmed |
Power stage
Why this device： The inverter bridge; efficiency and junction temperature determine whether the compressor can run continuously at full load.
How to choose： At 400 V+ buses, 650 V or 1200 V devices; SiC for high switching frequency and efficiency, IGBT where cost and surge capability dominate.
| Part number | Brand | Category | Package | Qualification | Operating temperature | Key parameters | Docs | Actions |
|---|---|---|---|---|---|---|---|---|
| BSC026N02KSGAUMA1 In stock | Infineon | OptiMOS Low-Voltage MOSFETs | SC026 | AEC-Q101 qualified | -55 °C ~ +150 °C | channel: N · vds: 25 V · id: 100 A | Datasheet ↗ | |
| C3D08065I In stock | CREE | SiC Schottky Diodes | TO-220-2 Isolated | AEC-Q101 qualified | -55 °C ~ +150 °C | vds: 650 V · id: 8 A · rds: — | Datasheet ↗ | |
| 2N7002-TP In stock | MCC | Small-Signal MOSFETs | SOT-23 | Qualification to be verified | To be confirmed | To be confirmed | Datasheet ↗ | |
| 2N7002DW-TP In stock | MCC | Small-Signal MOSFETs | SOT-363 | Qualification to be verified | To be confirmed | To be confirmed | Datasheet ↗ | |
| 2N7002E-7-F In stock | Diodes | Small-Signal N-Channel MOSFETs | SOT-23 | Qualification to be verified | To be confirmed | To be confirmed | Datasheet ↗ | |
| 2N7002K-TP In stock | MCC | Small-Signal MOSFETs | SOT-23 | Qualification to be verified | To be confirmed | To be confirmed | Datasheet ↗ |
Key selection parameters
| DC bus voltage | Typically 300–450 V or 48 V mild hybrid |
| Output power | 1–5 kW |
| Peak phase current | Start-up and locked-rotor current |
| Switching frequency | 10–20 kHz (IGBT) / 40–100 kHz (SiC) |
| Qualification | AEC-Q101 for discrete power devices |
FAQ
SiC or IGBT for a compressor?
If the housing cannot absorb the loss or the switching frequency must go up, SiC pays for itself; otherwise a well-driven IGBT bridge remains the value choice.
Related
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