Key Takeaways Steady-state thermal resistance alone is insufficient for IGBT junction temperature prediction — transient thermal impedance must be used to capture pulse-driven heating during switching events. A single-node RC thermal model fails above ~100 Hz because it cannot represent…

Key Takeaways A bootstrap circuit enables cost-effective high-side gate drive for N-channel MOSFETs/IGBTs in half-bridge topologies by using a flying capacitor charged during low-side conduction — eliminating the need for multiple isolated supplies. Bootstrap operation imposes a fundamental duty-cycle limit:…

Key Takeaways The EG8010 is a fully digital SPWM inverter driver IC that generates pure sine wave output at 50 Hz or 60 Hz (or variable frequency up to 400 Hz) with a fixed 23.4 kHz carrier — eliminating analogue…

Key Takeaways A production-grade 48 V e-bike battery charger for lead-acid packs uses a two-stage architecture: a UC3842-controlled flyback converter (50 kHz) followed by an EG4318 three-stage charging management IC. The constant-current stage delivers 2.5 A using a 0.1 Ω…

Key Takeaways The hybrid full-bridge three-level LLC (H-FBTLLLC) converter uniquely combines wide-input-range operation, full-load ZVS for all switches, and natural ZCS for output rectifiers — eliminating reverse recovery losses and snubbers. In three-level mode (low input), chopping transistors Q1/Q4 regulate…

Key Takeaways For 3.3 kW single-phase PFC, Continuous Conduction Mode (CCM) Boost is the industry-standard topology—offering high efficiency (>97%) without complex soft-switching circuitry. Design must be anchored at the low-line worst-case condition (176 Vrms), where input current, conduction losses, and…

Key Takeaways The Vienna rectifier is a three-level, bidirectional-switch-based three-phase PFC topology ideal for 1–20 kW industrial applications—including EV chargers, telecom rectifiers, and motor drives—due to its low THD, high efficiency (>97%), and reduced device voltage stress. Each power switch…

Key Takeaways Conducted EMI in switch-mode power supplies (SMPS) is dominated by common-mode (CM) currents, especially above 1 MHz — not differential-mode (DM) ripple. The core physical principle behind effective countermeasures is providing a low-impedance return path for CM noise…

Key Takeaways Conducted EMI in switch-mode power supplies (SMPS) is dominated by common-mode (CM) currents, especially above 1 MHz — not differential-mode (DM) ripple. The core physical principle behind effective countermeasures is providing a low-impedance return path for CM noise…

Key Takeaways EMI filters for switch-mode power supplies (SMPS) must suppress both common-mode (CM) noise (L–G and N–G paths) and differential-mode (DM) noise (L–N path), each requiring distinct components and design approaches. X capacitors (across L–N, typically 0.1–0.47 µF) target…