Patent ID: 8921747

Claim:
An electric heating appliance comprising: an input where AC electric current having an input frequency is introduced to the electric heating appliance; a heating element that generates heat in response to being electrically energized by electric energy; a filter that attenuates a noise component being conducted toward the input, said noise having a frequency that is greater than the input frequency of the AC electric current, wherein the filter is devoid of capacitors that would otherwise establish a conductive path for a high-frequency alternating signal to a ground electrode; a rectifier disposed electrically between the filter and the heating element, wherein the rectifier converts the AC electric current into a rectified signal provided between a positive DC bus and a DC bus return; a smoothing capacitor connected across an output of the rectifier between the positive DC bus and the DC bus return; and a grounding capacitor that establishes a capacitive conductive path between the output of the rectifier and a ground electrode, the grounding capacitor being electrically disposed between the rectifier and the heating element, wherein the smoothing capacitor is connected to the ground electrode through the grounding capacitor, wherein a radio-frequency voltage conducted between the input and the heating element of the electric heating appliance comprises an average that is less than 46 dBμV within a frequency range that extends from 500 kHz to 5 MHz and measured using a 50 μH/50Ω line impedance stabilization network, and the grounding capacitor comprises a capacitance value that limits a leakage current having a frequency of 60 Hz or less and a maximum voltage of 120 V RMS conducted by the capacitive conductive path to less than 3,500 μA.