Patent ID: 7547987

Claim:
A power inverter comprising: a printed circuit board having at least one power layer with at least a first and a second section, said sections being electrically separated from each other on said power layer and maintained at different voltages in operation, a circuit component connected to and powered by said first section of the power layer, a PWM switching power supply mounted in and powered by said second section of the power layer, an electromagnetic filter electrically connected between said sections of said power layer, said filter configured to block at least a portion of high frequency signals between said sections while enabling said sections to be maintained at the same DC voltage level, wherein said printed circuit board comprises: a ground layer having a first section and a second section electrically separated from each other on said ground layer, a load circuit, functioning as control or signal conditioning, connected to said first section of the ground layer, a PWM switching power supply module connected to said second section of the ground layer, a second electromagnetic filter electrically connected between said sections of said ground layer, said filter configured to block a portion of high frequency noise from said sections of the ground layer while enabling said sections to be maintained at the same DC voltage level.