Electric heating appliance with AC-line filter with low leakage current

Provided is a power supply apparatus, and an appliance including the power supply apparatus, which includes a filter that attenuates a noise component of an AC electric current. The filter lacks a capacitor establishing a conductive path for conducting a high-frequency alternating signal, a leakage current, or both to a ground electrode. A rectifier is also included, and is disposed electrically between the filter and a load that is to be energized by operation of the power supply circuit. The rectifier converts the AC electric current into a rectified signal. The power supply apparatus also includes a grounding capacitor that establishes a capacitive, conductive path between an output of the rectifier and a ground electrode that is to be electrically connected to earth ground. The grounding capacitor is electrically separated from the filter by the rectifier, and extends electrically between the ground conductor and at least one of: (i) a positive DC bus conductor from the rectifier, and (ii) a DC bus return to the rectifier.