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Texas Instruments TPSF12C3/TPSF12C3-Q1 Standalone Active Filter IC is designed to reduce common-mode (CM) electromagnetic interference (EMI) in three-phase AC power systems. The active EMI filter (AEF) configured with voltage sense and current inject (VSCI) uses a capacitive multiplier circuit to emulate the Y-capacitors in a conventional passive filter design. The device senses the high-frequency noise on each power line using a set of sense capacitors. It injects noise-canceling currents back into the power lines using an injection capacitor. The circuit gain and the injection capacitance set the effective active capacitance. The AEF sensing and injection impedances use relatively low capacitance values with small component footprints. The device includes integrated filtering, compensation, protection circuitry, and an enable input.
The Texas Instruments TPSF12C3/TPSF12C3-Q1 provides a very low impedance path for CM noise in the frequency range of interest for EMI measurement. Enabling up to 30dB of CM noise reduction at the lower end of specified frequency ranges (150kHz to 3MHz) significantly reduces the size, weight, and cost of the CM filter implementation. The LMR140x0-Q1 devices are AEC-Q100 qualified for automotive applications.
