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Key Takeaways An air gap dramatically increases magnetic reluctance—dominating total circuit reluctance—and prevents core saturation under DC bias by linearizing the B-H relationship. Effective permeability (μe) quantifies how much a gap reduces inductance and stabilizes it against temperature, aging, and…
Key Takeaways PMIC design begins with a rigorous spec sheet — input range (2.7–5 V), output (5 V ±4%), ripple (< ±40 mV), efficiency (~90%), and max switching frequency (≤800 kHz) directly drive topology and sub-block choices. The buck converter…
Key Takeaways Variable-frequency power supply design hinges on intelligent semiconductor selection: MOSFETs dominate high-frequency, low-voltage stages (e.g., PFC), while IGBTs are optimal for medium-to-high voltage, medium-frequency motor drives (dc bus 400–800 V, switching up to ~20 kHz). COOLMOS (superjunction) technology…
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Key Takeaways SMPS achieves high efficiency (80–90%+) by operating the power switch in saturation/cutoff — minimizing conduction and voltage drop losses. Pulse Width Modulation (PWM) is the dominant control method due to its fixed switching frequency, which simplifies EMI filtering…
Key Takeaways Crss (reverse transfer capacitance) and Qgd dominate switching loss in MOSFETs—prioritize low Crss over low total gate charge when selecting for hard-switching SMPS above 100 kHz. MOSFETs offer positive RDS(on) temperature coefficient for inherent current sharing in parallel…
Key Takeaways SMPS control loop stability hinges on achieving ≥45° phase margin and ≥12 dB gain margin — not just theoretical modeling, but bench-verified with a frequency response analyzer (FRA). The power-stage transfer function dictates compensation type: Type II suffices…
Scaling a 750W STM32 Platform to a 1kW Off-Grid Pure Sine Wave Inverter: Complete Engineering Roadmap This article details the rigorous, production-grade engineering process required to scale an existing 750W STM32-based inverter platform into a robust, field-deployable 1kW off-grid pure…
48V 20–30A BLDC/PMSM Servo Controller Custom Development: Compact STM32G4 FOC Design This article details the engineering architecture, design trade-offs, and validation methodology for a high-density 48V BLDC PMSM servo controller design targeting robotics, industrial automation, and advanced R&D platforms. Unlike…