US 12,334,848 B2
Multilayer printed circuit board dVdT filter with powder core toroids
Peda V Medagam, Rapid City, SD (US); and Nicholas R Kingsbury, Rapid City, SD (US)
Filed by Peda V Medagam, Rapid City, SD (US); and Nicholas R Kingsbury, Rapid City, SD (US)
Filed on Jun. 6, 2023, as Appl. No. 18/206,365.
Prior Publication US 2024/0413775 A1, Dec. 12, 2024
Int. Cl. G01R 31/42 (2006.01); H02P 21/00 (2016.01)
CPC H02P 21/50 (2016.02) 17 Claims
OG exemplary drawing
 
1. A dv/dt filter for a three-phase motor control assembly, comprising:
a multilayer printed circuit board (PCB);
a three-phase input assembly mounted to the PCB and constructed to receive a first, a second and a third pulse width modulation (PWM) signal;
a three-phase power output assembly mounted to the PCB and constructed to output a first phase, a second phase, and a third phase power signal to a motor;
a first powder core toroid inductor coupled between the first PWM signal and the first phase output signal;
a second powder core toroid inductor coupled between the second PWM signal and the second phase output signal;
a third powder core toroid inductor coupled between the third PWM signal and the third phase output signal;
wherein each of the first, second and third toroid inductors has a respective damping resistor for reducing oscillation harmonics; and
wherein each of the first, second and third phase power signals has a respective shunting capacitor for grounding high frequency noise.